US20080103476A1 - Medical tubing connector assembly incorporating strain relief sleeve - Google Patents
Medical tubing connector assembly incorporating strain relief sleeve Download PDFInfo
- Publication number
- US20080103476A1 US20080103476A1 US11/964,999 US96499907A US2008103476A1 US 20080103476 A1 US20080103476 A1 US 20080103476A1 US 96499907 A US96499907 A US 96499907A US 2008103476 A1 US2008103476 A1 US 2008103476A1
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- United States
- Prior art keywords
- sleeve
- connector pin
- passageway
- diameter
- end portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/10—Tube connectors; Tube couplings
- A61M39/1011—Locking means for securing connection; Additional tamper safeties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L37/00—Couplings of the quick-acting type
- F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
- F16L37/12—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members using hooks, pawls or other movable or insertable locking members
- F16L37/138—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members using hooks, pawls or other movable or insertable locking members using an axially movable sleeve
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/10—Tube connectors; Tube couplings
- A61M2039/1027—Quick-acting type connectors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/10—Tube connectors; Tube couplings
- A61M2039/1044—Verifying the connection, e.g. audible feedback, tactile feedback, visual feedback, using external light sources
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/10—Tube connectors; Tube couplings
- A61M2039/1066—Tube connectors; Tube couplings having protection means, e.g. sliding sleeve to protect connector itself, shrouds to protect a needle present in the connector, protective housing, isolating sheath
Definitions
- the present invention relates generally to medical devices and, more particularly, to connector assemblies for joining two pieces of medical tubing, e.g., catheters, wherein the connector assemblies are operable to provide strain relief to the catheter connection.
- a typical implant procedure may involve implanting a drug infusion pump into a cavity or subcutaneous pocket in the body and delivering a drug, via a catheter(s), to an epidural space or intrathecal space of the spinal column or to a particular location within the brain.
- a catheter assembly having two or more catheter sections, e.g., a thin-walled distal section (near the implantation site) and a thicker-walled proximal section (connected directly to the infusion pump), may be used to deliver the drug to the desired site.
- the distal catheter section may be positioned in the desired location in the body and then connected to the proximal catheter section by use of a medical tubing connector.
- the connection may be made by inserting one end or prong of the connector into a lumen of one catheter section (e.g., the proximal section) and the other end of the connector into the lumen of the other catheter section (e.g., the distal section) and then sliding both catheter sections towards one another (toward the middle of the connector).
- the proximal section may then be connected to the drug infusion pump.
- a connector assembly having a connector pin.
- the connector pin includes: a first end portion, a second end portion, and a lumen extending between the first end portion and the second end portion; and a central portion located between the first end portion and the second end portion, wherein the central portion has an outer dimension that is larger than an outer dimension of both the first and second end portions.
- the assembly also includes a tubular connector sleeve comprising a first end, a second end, and a passageway extending between the first end and the second end.
- the passageway is stepped such that it has: a first diameter between the first end of the sleeve and a stop surface located in the passageway; and a second diameter between the stop surface and the second end of the sleeve, wherein the first diameter is greater than the second diameter.
- a method of interconnecting sections of medical tubing includes inserting a first end portion of a connector pin into a first medical tube.
- the connector pin includes: a second end portion, wherein a lumen extends between the first end portion and the second end portion; and a central portion located between the first and second end portions, wherein the central portion includes an outer dimension that is greater than an outer dimension of either of the first and second end portions.
- the method also includes: inserting the second end portion into a second medical tube; sliding a tubular sleeve over the first and second medical tubes and the connector pin; and engaging a first lock portion located within a passageway of the sleeve with a second lock portion of the connector pin.
- FIG. 1 is a perspective view of a connector assembly in accordance with one exemplary embodiment of the invention, the connector assembly for use with coupling separate sections of medical tubing, e.g., catheters;
- FIG. 2 is a cross-sectional view of the connector assembly of FIG. 1 ;
- FIG. 3 is a perspective view of a connector pin in accordance with one embodiment of the present invention.
- FIG. 4 is a perspective view of a connector pin in accordance with another embodiment of the present invention.
- FIG. 5 in a perspective view of a tubular connector sleeve in accordance with one embodiment of the invention
- FIGS. 6-7 illustrate an exemplary method for assembling the connector assembly of FIGS. 1 and 2 ; wherein FIG. 6 illustrates the connector pin during insertion into the tubular connector sleeve; and FIG. 7 illustrates the connector pin after complete insertion into the sleeve.
- the invention is directed to apparatus and methods for securely coupling two pieces of tubing to one another. While the invention may find application to most any type of tubing, it is especially well-suited to the joining of separate sections of medical tubing, e.g., catheters.
- connector assemblies in accordance with embodiments of the present invention may be used to couple a drug infusion catheter (extending from a drug infusion pump) to a brain infusion catheter located at a predetermined location within a human brain.
- a drug infusion catheter extending from a drug infusion pump
- a brain infusion catheter located at a predetermined location within a human brain.
- FIGS. 1 and 2 illustrate a medical tubing connector assembly 50 in accordance with one embodiment of the invention.
- the assembly 50 may include a medical connector, e.g., connector pin 100 (see FIG. 2 ), and a strain relieving, tubular connector sleeve 200 .
- a first medical tubing section, e.g., first catheter 60 , and a second tubing section, e.g., second catheter 70 may couple to the connector pin 100 as further described below.
- the tubular sleeve 200 may slide over the connector pin 100 and the catheters 60 and 70 as shown, resulting in a secure and substantially leak-free coupling of the independent catheters.
- the connector assembly 50 may provide strain relief for the catheters 60 and 70 . That is, the tubular connector sleeve 200 may provide resistance to tearing of the catheters 60 and 70 by the ends of connector pin 100 and further resist forces that would tend to separate, or allow relative movement of, the connector pin 100 relative to the catheters 60 and 70 .
- the connector assembly 50 may also include securing features, e.g., suture grooves 202 on an exterior surface of the sleeve 200 , to permit securing the sleeve 200 over the connector pin 100 and for fixing of the assembly relative to local tissue 82 , e.g., with a suture 80 .
- FIG. 2 illustrates a cross section of the connector assembly 50 .
- the connector pin 100 is illustrated as a generally longitudinal member having a first end portion 102 (also shown in FIG. 3 ) operable to fit within a lumen 62 of the first catheter 60 with a small clearance fit or, alternatively, an interference fit, and a second end portion 104 operable to fit within a lumen 72 of the second catheter 70 with small clearance, or interference, fit.
- the fits between the connector pin 100 and the catheters 60 and 70 may be sufficient to hold the catheters in place, relative to the connector pin, under normal operating circumstances.
- the connector pin 100 may also include a central portion 106 positioned between the first end portion 102 and the second end portion 104 .
- the central portion 106 has an outer or external dimension, e.g., a diameter 108 , that is preferably larger than at least one of: an outer or external dimension (e.g., a first diameter 110 ) of the first end portion 102 ; and an outer or external dimension (e.g., a second diameter 112 ) of the second end portion 104 .
- the connector pin 100 may also include a lumen 114 extending through the pin from the first end portion 102 to the second end portion 104 .
- the lumen 114 in the illustrated embodiment, may pass completely through the connector pin 100 so as to permit fluid communication between the first catheter 60 and the second catheter 70 .
- FIG. 3 is an enlarged perspective view of the exemplary connector pin 100 of FIG. 2 .
- the connector pin 100 may be made of most any biocompatable material including various metals and plastics, e.g., noble metals such as titanium.
- the connector pin 100 may be an integral component or, alternatively, the enlarged central portion 106 may be made of a secondary material which may, for example, be molded to a shaft formed by the first and second end portions.
- the lumen 114 may be generally concentric to the longitudinal axis of the connector pin 100 .
- the end portions 102 and 104 may extend a sufficient distance from the central portion 106 to ensure adequate engagement with the catheters 60 and 70 .
- the end portions 102 and 104 may be most any shape, they are preferably cylindrical to correspond with the shape of the catheter lumens into which they are inserted.
- the enlarged central portion 106 may also be of most any shape but is also preferably cylindrical to correspond to the shape of the tubular connector sleeve 200 as further described below.
- enlarged central portion 106 may include an outer surface 116 bounded by stop surfaces 118 and 120 , which are generally perpendicular to a longitudinal axis of the connector pin 100 .
- the stop surfaces 118 and 120 may provide a positive stop against which the ends of the catheters 60 and 70 , respectively, abut when the connector pin 100 is inserted therein.
- the stop surface 120 may also assist the physician in locating the tubular connector sleeve 200 relative to the connector pin 100 as further described below.
- the central portion 106 may further include a lock portion (a portion operable to positively lock with another component) operable to secure the connector pin 100 to the tubular connector sleeve 200 .
- the lock portion may be formed by a recess, e.g., a circumferential lock groove 122 , formed in the outer surface 116 of the central portion 106 .
- the lock groove 122 may engage a corresponding lock portion associated with the tubular connector sleeve 200 as further described below.
- An alternative connector pin 130 illustrated in FIG. 4 may include end portions 132 and 134 that have axial tapers 136 and 138 , respectively.
- the axial tapers 136 and 138 may assist in insertion of the end portions 132 and 134 into receiving ends of the medical tubing.
- the end portions 132 and 134 may also include circumferentially depressed sections 140 and 142 , respectively.
- the circumferentially depressed sections 140 and 142 may assist in securing the medical tubing to the end portions 132 and 134 . That is, since medical tubing is typically made of a generally compliant material, the inner surface of the tubing (e.g., catheters 60 and 70 of FIG.
- connector pin 130 will generally comply with the surface of the end portions of the connector pin 130 , including the depressed sections 140 and 142 .
- Other connector pin embodiments may be similar to those described in U.S. Pat. No. 5,405,339 to Kohnen et al.
- FIG. 5 illustrates the exemplary tubular connector sleeve 200 of FIGS. 1 and 2 .
- the connector sleeve 200 may be made of a flexible and resilient material operable to receive the catheters 60 and 70 and the connector pin 100 therein. Once assembled, the connector sleeve 200 may provide not only secure coupling of the mating components, but also strain relief to the catheter ends.
- the connector sleeve 200 may include a passageway 208 extending from a first end 204 of the sleeve to a second end 206 .
- the passageway 208 is cylindrical and stepped. The step may be defined, for example, by providing a first section 209 of the passageway 208 extending from the first end 204 of the sleeve 200 to a stop surface 212 located within the passageway 208 .
- the passageway 208 may, in the first section 209 , have a first interfacing dimension, e.g., may be defined by a first diameter 210 .
- the passageway 208 may also include a second section 211 that extends from the stop surface 212 to the second end 206 of the sleeve 200 .
- the second section 211 may have a second interfacing dimension, e.g., may be defined by a second diameter 214 .
- the first interfacing dimension of the passageway 208 may be greater than the second interfacing dimension, e.g., the first diameter 210 may be greater than the second diameter 214 .
- the term “diameter” may refer to the length of the longest straight line segment passing through the center of a cross-section of a respective object, e.g., the passageway 208 , and terminating at the object periphery, e.g., at the walls of the passageway.
- the term “diameter” may be used to describe an effective diameter of any component of the present invention (e.g., sleeve, sleeve passageway, connector pin, lumen, and tubing section) whether it has a circular or non-circular cross-sectional shape, e.g., oval.
- passageway 208 is described and illustrated herein as including two generally uniform stepped bores, the actual shape of the passageway and, for that matter, the shape of the connector sleeve 200 itself, may be altered without departing from the scope of the invention.
- the first section 209 of the sleeve 200 may be defined by an inner surface 216 .
- the inner surface or wall 216 may include a lock portion, e.g., an inwardly extending protrusion 218 .
- the protrusion 218 is preferably circumferential and operable to engage a mating lock portion, e.g., the lock groove 122 (see FIG. 3 ) of the connector pin 100 , when the latter is correctly positioned within the connector sleeve (see FIG. 2 ).
- the connector sleeve 200 may also include suture grooves 202 .
- the connector sleeve 202 may include two separate suture grooves 202 defined by outwardly extending circumferential protrusions 203 .
- the material used to make the connector sleeve 200 is preferably flexible and resilient. While various polymers are suitable, materials that achieve these objectives may include silicone and polyurethane. In other embodiments, the sleeve 200 could be made of a less compliant, e.g., relatively rigid, material.
- FIGS. 6 and 7 are cross-sectional views of the exemplary connector assembly 50 of FIGS. 1 and 2 in various stages of assembly.
- the connector assembly is described herein with respect to a drug or fluid medication delivery system using an implanted drug pump (not shown) operable to deliver drugs to a location within the brain. As stated above, however, this application is not limiting.
- a catheterization procedure may begin with the placement of a distal catheter section (e.g., the catheter 70 of FIG. 2 ).
- This section of catheter may be inserted in a manner known to those skilled in the art.
- a subcutaneous pump pocket may be prepared at the desired anatomical location within a patient's body.
- a proximal catheter section e.g., catheter 60 of FIG. 2
- catheter 60 of FIG. 2 may then be tunneled from the distal catheter section to the pump pocket.
- the adjacent ends of the distal and proximal catheter sections e.g., the coupling ends of catheters 60 and 70 that are shown in the Figures, may be connected using the connector assembly described herein.
- the connector sleeve 200 may first be slid over the coupling end of the second catheter 70 .
- the sleeve may be slid sufficiently onto the second catheter 70 to permit the physician unimpeded access to the coupling end of the second catheter.
- the second end portion 104 of the connector pin 100 (in some embodiments, the connector pin 100 may be symmetrical such that the first end portion 102 is identical to the second end portion) may be inserted into the lumen 72 of second catheter 70 .
- the first end portion 102 may be similarly inserted into the lumen 62 of the first catheter 60 .
- the end portions 102 and 104 of the connector pin 100 are preferably inserted into their respective catheter sections 60 and 70 until they contact the respective tubing stop surfaces 118 and 120 .
- the implanting physician may effect the catheter connections by grasping the enlarged central portion 106 of the connector pin 100 .
- each end portion 102 and 104 may be slightly larger than the undeflected diameter of the lumens of the respective catheters 60 and 70 .
- the outer diameters of the end portions 102 and 104 may be the same as, or slight less than, the diameters of the lumens of the respective catheters. The resulting fit between the components may result in not only secure connection of the catheters 60 and 70 , but may also provide substantially leak-free flow of fluid between the catheters.
- the tubular connector sleeve 200 may be slid over the connector pin 100 in the direction 220 until the second stop surface 120 of the connector pin 100 contacts the stop surface 212 of the connector sleeve 200 as shown in FIG. 7 .
- the circumferential protrusion 218 of the sleeve 200 may traverse the central portion 106 of the connector pin 100 until the protrusion 218 reaches the lock groove 122 , whereby the protrusion engages the lock groove as shown in FIG. 7 .
- the outer diameters of the catheters 60 and 70 may be slightly larger than the undeflected diameters 210 and 214 of the connector sleeve 200 (see FIG. 5 ).
- the diameter 210 may be sized to receive the central portion 106 of the pin connector 100 therein as shown in the figures.
- the diameters 210 and 214 may be the same as, or slightly larger than, the corresponding catheters 60 and 70 and the central portions 106 . The resulting fit between the sleeve and the catheters 60 and 70 and pin connector 100 assists in securing the sleeve in place.
- the abutting relationship of the stop surface 120 (of the connector pin 100 ) with the stop surface 212 (of the connector sleeve 200 ) provides means to ensure proper longitudinal positioning, e.g., self-location, of the sleeve relative to the pin. Still further, the engagement of the protrusion 218 of the sleeve 200 with the groove 122 of the connector pin 100 provides positive feedback to the physician during connection and further prevents longitudinal separation, e.g., pulling apart, of the catheters 60 and 70 .
- stop surface 212 is shown herein as being generally perpendicular to the axis of the sleeve 200 , other embodiments may provide other surface configurations. For example, a tapered surface may be used to form the stop surface.
- the connector assembly 50 may be secured to surrounding tissue, e.g., sutured or ligated to scalp tissue, using the suture grooves 202 .
- a suture groove 202 is located over each side of the central portion 106 , such that each catheter is effectively ligated by a suture.
- the size of medical tubing connector assembly 50 may vary depending upon the size of the particular tubing to be connected.
- the catheters 60 and 70 may have an undeflected lumen diameter of about 0.02 to about 0.03 inches (in), e.g. about 0.024 in (0.61 millimeters (mm)).
- the connector pin 100 may have a length of about 0.5 in (13 mm), while the outer diameter of each end portion 102 and 104 may be about 0.024 in (0.61 mm).
- the outer diameter of the enlarged central portion 106 may be about 0.085 in (2.16 mm), while the outer diameter of the first catheter 60 and the second catheter 70 may be about 0.089 in (2.26 mm) and 0.041 in (1.04 mm), respectively.
- the sleeve 200 may have length of about 0.6 to about 1 in, e.g., about 0.8 in (20 mm), a first outer diameter (proximate the first end 204 ) of about 0.125 in (3.17 mm), a first inner diameter 210 of about 0.080 to about 0.10 in, e.g., about 0.094 in (2.4 mm), a second outer diameter (proximate the second end 206 ) of about 0.088 in (2.23 mm), and a second inner diameter 214 of about 0.035 to about 0.050 in, e.g., about 0.046 in (1.17 mm).
- Connector assemblies in accordance with embodiments of the present invention may provide a secure method and apparatus for connecting separate sections of medical tubing by using a two-piece connector assembly (connector pin and connector sleeve).
- connector sleeves in accordance with embodiments of the present invention provide not only secure coupling, but also strain relief to the catheter connection.
- the sleeve 200 when assembled, the sleeve 200 preferably extends a first distance 222 beyond the end of the first end portion 102 of the pin connector 100 (see FIG. 7 ) and a second distance 224 beyond the second end portion 104 . That is, a longitudinal length of the connector sleeve 200 is preferably greater than a longitudinal length of the connector pin 100 . This construction may reduce the chance of the pin connector 100 puncturing the catheters.
Abstract
A connector assembly for interconnecting separate sections of tubing, e.g., medical tubing. Connector assemblies are, in one embodiment, a two-piece construction having a connector pin and a connector sleeve. An exemplary connector sleeve includes a first end, a second end, and a passageway extending between the first and second ends. The passageway, in one embodiment, is stepped, e.g., defined by both a bore of a first diameter and a bore of a second diameter.
Description
- The present invention relates generally to medical devices and, more particularly, to connector assemblies for joining two pieces of medical tubing, e.g., catheters, wherein the connector assemblies are operable to provide strain relief to the catheter connection.
- In many medical applications, it is necessary to connect one section of medical tubing, e.g., a catheter, with another. Generally speaking, it is important that these connections be relatively secure and stable so that the tubing does not separate or develop leaks at the connection point. Security and leak-resistance take on special importance in applications where the tubing sections are implanted in a human body.
- One procedure that necessitates implantation of medical tubing into the body involves the use of an implantable drug infusion pump. Such pumps are often used to control pain and/or spasticity, as well as to provide one or more drugs or fluid medications to a particular location within the body. For instance, a typical implant procedure may involve implanting a drug infusion pump into a cavity or subcutaneous pocket in the body and delivering a drug, via a catheter(s), to an epidural space or intrathecal space of the spinal column or to a particular location within the brain. In this exemplary application, a catheter assembly having two or more catheter sections, e.g., a thin-walled distal section (near the implantation site) and a thicker-walled proximal section (connected directly to the infusion pump), may be used to deliver the drug to the desired site.
- The distal catheter section may be positioned in the desired location in the body and then connected to the proximal catheter section by use of a medical tubing connector. The connection may be made by inserting one end or prong of the connector into a lumen of one catheter section (e.g., the proximal section) and the other end of the connector into the lumen of the other catheter section (e.g., the distal section) and then sliding both catheter sections towards one another (toward the middle of the connector). The proximal section may then be connected to the drug infusion pump.
- While adequate, difficulties have been encountered in the manufacture and use of such prior art medical connectors. For example, these connectors, which have been sized to fit within the lumens of the catheter tubing sections, are small and may be difficult to manipulate during implantation. Moreover, because some of these connectors fit entirely within the lumens of the respective catheter sections, it is often difficult for the implanting physician to be sure that the interface between catheter sections is positioned at, or even near, the center of the connector, i.e., it may be difficult to center the catheter sections on the connector. Misalignment of the connector can result in a weakened connection that is more likely to separate and/or develop leaks. Other potential problems include: lack of ability to adequately secure the catheters relative to one another; and inability to provide sufficient strain relief to the connection.
- Embodiments of the present invention provide connector assemblies and methods for connecting sections of medical tubing that may overcome some or all of the problems identified above. For example, in one embodiment, a connector assembly is provided having a connector pin. The connector pin includes: a first end portion, a second end portion, and a lumen extending between the first end portion and the second end portion; and a central portion located between the first end portion and the second end portion, wherein the central portion has an outer dimension that is larger than an outer dimension of both the first and second end portions. The assembly also includes a tubular connector sleeve comprising a first end, a second end, and a passageway extending between the first end and the second end. The passageway is stepped such that it has: a first diameter between the first end of the sleeve and a stop surface located in the passageway; and a second diameter between the stop surface and the second end of the sleeve, wherein the first diameter is greater than the second diameter.
- In another embodiment, a method of interconnecting sections of medical tubing is provided, wherein the method includes inserting a first end portion of a connector pin into a first medical tube. The connector pin includes: a second end portion, wherein a lumen extends between the first end portion and the second end portion; and a central portion located between the first and second end portions, wherein the central portion includes an outer dimension that is greater than an outer dimension of either of the first and second end portions. The method also includes: inserting the second end portion into a second medical tube; sliding a tubular sleeve over the first and second medical tubes and the connector pin; and engaging a first lock portion located within a passageway of the sleeve with a second lock portion of the connector pin.
- The above summary is not intended to describe each embodiment or every implementation of the present invention. Rather, a more complete understanding of the invention will become apparent and appreciated by reference to the following Detailed Description of Exemplary Embodiments and claims in view of the accompanying figures of the drawing.
- The present invention will be further described with reference to the figures of the drawing, wherein:
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FIG. 1 is a perspective view of a connector assembly in accordance with one exemplary embodiment of the invention, the connector assembly for use with coupling separate sections of medical tubing, e.g., catheters; -
FIG. 2 is a cross-sectional view of the connector assembly ofFIG. 1 ; -
FIG. 3 is a perspective view of a connector pin in accordance with one embodiment of the present invention; -
FIG. 4 is a perspective view of a connector pin in accordance with another embodiment of the present invention; -
FIG. 5 in a perspective view of a tubular connector sleeve in accordance with one embodiment of the invention; -
FIGS. 6-7 illustrate an exemplary method for assembling the connector assembly ofFIGS. 1 and 2 ; whereinFIG. 6 illustrates the connector pin during insertion into the tubular connector sleeve; andFIG. 7 illustrates the connector pin after complete insertion into the sleeve. - In the following detailed description of illustrative embodiments of the invention, reference is made to the accompanying figures of the drawing which form a part hereof, and in which are shown, by way of illustration, specific embodiments in which the invention may be practiced. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the present invention. Unless stated otherwise herein, the figures of the drawing are rendered primarily for clarity and thus may not be drawn to scale.
- Generally speaking, the invention is directed to apparatus and methods for securely coupling two pieces of tubing to one another. While the invention may find application to most any type of tubing, it is especially well-suited to the joining of separate sections of medical tubing, e.g., catheters. For instance, connector assemblies in accordance with embodiments of the present invention may be used to couple a drug infusion catheter (extending from a drug infusion pump) to a brain infusion catheter located at a predetermined location within a human brain. Accordingly, while the following exemplary embodiments are described with reference to such infusion catheter couplings and methods, those of skill in the art will realize that the invention may find use with most any type of tubing application.
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FIGS. 1 and 2 illustrate a medicaltubing connector assembly 50 in accordance with one embodiment of the invention. Theassembly 50 may include a medical connector, e.g., connector pin 100 (seeFIG. 2 ), and a strain relieving,tubular connector sleeve 200. A first medical tubing section, e.g.,first catheter 60, and a second tubing section, e.g.,second catheter 70, may couple to theconnector pin 100 as further described below. Once so coupled, thetubular sleeve 200 may slide over theconnector pin 100 and thecatheters - Moreover, as further explained below, the
connector assembly 50 may provide strain relief for thecatheters tubular connector sleeve 200 may provide resistance to tearing of thecatheters connector pin 100 and further resist forces that would tend to separate, or allow relative movement of, theconnector pin 100 relative to thecatheters connector assembly 50 may also include securing features, e.g.,suture grooves 202 on an exterior surface of thesleeve 200, to permit securing thesleeve 200 over theconnector pin 100 and for fixing of the assembly relative tolocal tissue 82, e.g., with asuture 80. -
FIG. 2 illustrates a cross section of theconnector assembly 50. In this view, theconnector pin 100 is illustrated as a generally longitudinal member having a first end portion 102 (also shown inFIG. 3 ) operable to fit within alumen 62 of thefirst catheter 60 with a small clearance fit or, alternatively, an interference fit, and asecond end portion 104 operable to fit within alumen 72 of thesecond catheter 70 with small clearance, or interference, fit. The fits between theconnector pin 100 and thecatheters - The
connector pin 100 may also include acentral portion 106 positioned between thefirst end portion 102 and thesecond end portion 104. Thecentral portion 106 has an outer or external dimension, e.g., adiameter 108, that is preferably larger than at least one of: an outer or external dimension (e.g., a first diameter 110) of thefirst end portion 102; and an outer or external dimension (e.g., a second diameter 112) of thesecond end portion 104. Theconnector pin 100 may also include alumen 114 extending through the pin from thefirst end portion 102 to thesecond end portion 104. Thelumen 114, in the illustrated embodiment, may pass completely through theconnector pin 100 so as to permit fluid communication between thefirst catheter 60 and thesecond catheter 70. -
FIG. 3 is an enlarged perspective view of theexemplary connector pin 100 ofFIG. 2 . Theconnector pin 100 may be made of most any biocompatable material including various metals and plastics, e.g., noble metals such as titanium. Moreover, theconnector pin 100 may be an integral component or, alternatively, the enlargedcentral portion 106 may be made of a secondary material which may, for example, be molded to a shaft formed by the first and second end portions. In the illustrated embodiments, thelumen 114 may be generally concentric to the longitudinal axis of theconnector pin 100. - The
end portions central portion 106 to ensure adequate engagement with thecatheters end portions central portion 106 may also be of most any shape but is also preferably cylindrical to correspond to the shape of thetubular connector sleeve 200 as further described below. - In the embodiment illustrated in
FIG. 3 , enlargedcentral portion 106 may include anouter surface 116 bounded bystop surfaces connector pin 100. The stop surfaces 118 and 120 may provide a positive stop against which the ends of thecatheters connector pin 100 is inserted therein. By providing the stop surfaces 118 and 120, the physician may ensure that each catheter is properly engaged with theconnector pin 100. Thestop surface 120 may also assist the physician in locating thetubular connector sleeve 200 relative to theconnector pin 100 as further described below. - The
central portion 106 may further include a lock portion (a portion operable to positively lock with another component) operable to secure theconnector pin 100 to thetubular connector sleeve 200. In the illustrated embodiments, the lock portion may be formed by a recess, e.g., acircumferential lock groove 122, formed in theouter surface 116 of thecentral portion 106. Thelock groove 122 may engage a corresponding lock portion associated with thetubular connector sleeve 200 as further described below. - An
alternative connector pin 130 illustrated inFIG. 4 (which is similar in many respects to theconnector pin 100 described above) may include endportions axial tapers axial tapers end portions end portions depressed sections sections end portions catheters FIG. 2 ) will generally comply with the surface of the end portions of theconnector pin 130, including thedepressed sections -
FIG. 5 illustrates the exemplarytubular connector sleeve 200 ofFIGS. 1 and 2 . Theconnector sleeve 200 may be made of a flexible and resilient material operable to receive thecatheters connector pin 100 therein. Once assembled, theconnector sleeve 200 may provide not only secure coupling of the mating components, but also strain relief to the catheter ends. - The
connector sleeve 200 may include apassageway 208 extending from afirst end 204 of the sleeve to asecond end 206. In the illustrated embodiment, thepassageway 208 is cylindrical and stepped. The step may be defined, for example, by providing afirst section 209 of thepassageway 208 extending from thefirst end 204 of thesleeve 200 to astop surface 212 located within thepassageway 208. Thepassageway 208 may, in thefirst section 209, have a first interfacing dimension, e.g., may be defined by afirst diameter 210. Thepassageway 208 may also include asecond section 211 that extends from thestop surface 212 to thesecond end 206 of thesleeve 200. Thesecond section 211 may have a second interfacing dimension, e.g., may be defined by asecond diameter 214. The first interfacing dimension of thepassageway 208 may be greater than the second interfacing dimension, e.g., thefirst diameter 210 may be greater than thesecond diameter 214. - As used herein, the term “diameter” may refer to the length of the longest straight line segment passing through the center of a cross-section of a respective object, e.g., the
passageway 208, and terminating at the object periphery, e.g., at the walls of the passageway. Thus, the term “diameter” may be used to describe an effective diameter of any component of the present invention (e.g., sleeve, sleeve passageway, connector pin, lumen, and tubing section) whether it has a circular or non-circular cross-sectional shape, e.g., oval. - While the shape of the
passageway 208 is described and illustrated herein as including two generally uniform stepped bores, the actual shape of the passageway and, for that matter, the shape of theconnector sleeve 200 itself, may be altered without departing from the scope of the invention. - The
first section 209 of thesleeve 200 may be defined by aninner surface 216. The inner surface orwall 216 may include a lock portion, e.g., an inwardly extendingprotrusion 218. Theprotrusion 218 is preferably circumferential and operable to engage a mating lock portion, e.g., the lock groove 122 (seeFIG. 3 ) of theconnector pin 100, when the latter is correctly positioned within the connector sleeve (seeFIG. 2 ). - The
connector sleeve 200 may also includesuture grooves 202. In the illustrated embodiment, theconnector sleeve 202 may include twoseparate suture grooves 202 defined by outwardly extendingcircumferential protrusions 203. - The material used to make the
connector sleeve 200 is preferably flexible and resilient. While various polymers are suitable, materials that achieve these objectives may include silicone and polyurethane. In other embodiments, thesleeve 200 could be made of a less compliant, e.g., relatively rigid, material. - Assembly of the connector assembly of
FIGS. 1 and 2 will now be described with reference toFIGS. 6 and 7 . These figures are cross-sectional views of theexemplary connector assembly 50 ofFIGS. 1 and 2 in various stages of assembly. The connector assembly is described herein with respect to a drug or fluid medication delivery system using an implanted drug pump (not shown) operable to deliver drugs to a location within the brain. As stated above, however, this application is not limiting. - A catheterization procedure may begin with the placement of a distal catheter section (e.g., the
catheter 70 ofFIG. 2 ). This section of catheter may be inserted in a manner known to those skilled in the art. Before, during, or after proper placement of the distal section of thecatheter 70 has been verified, a subcutaneous pump pocket may be prepared at the desired anatomical location within a patient's body. A proximal catheter section, e.g.,catheter 60 ofFIG. 2 , may then be tunneled from the distal catheter section to the pump pocket. At this point in the procedure, the adjacent ends of the distal and proximal catheter sections, e.g., the coupling ends ofcatheters - As represented in
FIG. 6 , theconnector sleeve 200 may first be slid over the coupling end of thesecond catheter 70. The sleeve may be slid sufficiently onto thesecond catheter 70 to permit the physician unimpeded access to the coupling end of the second catheter. Thesecond end portion 104 of the connector pin 100 (in some embodiments, theconnector pin 100 may be symmetrical such that thefirst end portion 102 is identical to the second end portion) may be inserted into thelumen 72 ofsecond catheter 70. Thefirst end portion 102 may be similarly inserted into thelumen 62 of thefirst catheter 60. - The
end portions connector pin 100 are preferably inserted into theirrespective catheter sections central portion 106 of theconnector pin 100. - The outer diameter of each
end portion respective catheters end portions catheters - Once the
catheters connector pin 100 as generally illustrated inFIG. 6 , thetubular connector sleeve 200 may be slid over theconnector pin 100 in thedirection 220 until thesecond stop surface 120 of theconnector pin 100 contacts thestop surface 212 of theconnector sleeve 200 as shown inFIG. 7 . Prior to reaching the position illustrated inFIG. 7 , thecircumferential protrusion 218 of thesleeve 200 may traverse thecentral portion 106 of theconnector pin 100 until theprotrusion 218 reaches thelock groove 122, whereby the protrusion engages the lock groove as shown inFIG. 7 . - The outer diameters of the
catheters undeflected diameters FIG. 5 ). Similarly, thediameter 210 may be sized to receive thecentral portion 106 of thepin connector 100 therein as shown in the figures. In other embodiments, thediameters catheters central portions 106. The resulting fit between the sleeve and thecatheters pin connector 100 assists in securing the sleeve in place. Moreover, the abutting relationship of the stop surface 120 (of the connector pin 100) with the stop surface 212 (of the connector sleeve 200) provides means to ensure proper longitudinal positioning, e.g., self-location, of the sleeve relative to the pin. Still further, the engagement of theprotrusion 218 of thesleeve 200 with thegroove 122 of theconnector pin 100 provides positive feedback to the physician during connection and further prevents longitudinal separation, e.g., pulling apart, of thecatheters - While the
stop surface 212 is shown herein as being generally perpendicular to the axis of thesleeve 200, other embodiments may provide other surface configurations. For example, a tapered surface may be used to form the stop surface. - Once the
connector assembly 50 has been assembled as shown inFIG. 7 , it may be secured to surrounding tissue, e.g., sutured or ligated to scalp tissue, using thesuture grooves 202. Preferably, asuture groove 202 is located over each side of thecentral portion 106, such that each catheter is effectively ligated by a suture. - The size of medical
tubing connector assembly 50 may vary depending upon the size of the particular tubing to be connected. In one exemplary embodiment, thecatheters connector pin 100 may have a length of about 0.5 in (13 mm), while the outer diameter of eachend portion central portion 106 may be about 0.085 in (2.16 mm), while the outer diameter of thefirst catheter 60 and thesecond catheter 70 may be about 0.089 in (2.26 mm) and 0.041 in (1.04 mm), respectively. Thesleeve 200 may have length of about 0.6 to about 1 in, e.g., about 0.8 in (20 mm), a first outer diameter (proximate the first end 204) of about 0.125 in (3.17 mm), a firstinner diameter 210 of about 0.080 to about 0.10 in, e.g., about 0.094 in (2.4 mm), a second outer diameter (proximate the second end 206) of about 0.088 in (2.23 mm), and a secondinner diameter 214 of about 0.035 to about 0.050 in, e.g., about 0.046 in (1.17 mm). - Connector assemblies in accordance with embodiments of the present invention may provide a secure method and apparatus for connecting separate sections of medical tubing by using a two-piece connector assembly (connector pin and connector sleeve). Moreover, connector sleeves in accordance with embodiments of the present invention provide not only secure coupling, but also strain relief to the catheter connection. For instance, when assembled, the
sleeve 200 preferably extends afirst distance 222 beyond the end of thefirst end portion 102 of the pin connector 100 (seeFIG. 7 ) and asecond distance 224 beyond thesecond end portion 104. That is, a longitudinal length of theconnector sleeve 200 is preferably greater than a longitudinal length of theconnector pin 100. This construction may reduce the chance of thepin connector 100 puncturing the catheters. - The complete disclosure of the patents, patent documents, and publications cited in the Background, the Detailed Description of Exemplary Embodiments, and elsewhere herein are incorporated by reference in their entirety as if each were individually incorporated.
- Exemplary embodiments of the present invention are described above. Those skilled in the art will recognize that many embodiments are possible within the scope of the invention. Other variations, modifications, and combinations of the various components and methods described herein can certainly be made and still fall within the scope of the invention. Thus, the invention is limited only by the following claims and equivalents thereto.
Claims (22)
1-19. (canceled)
20. A method of interconnecting sections of medical tubing, the method comprising:
inserting a first end portion of a connector pin into a first medical tube, the connector pin comprising:
a second end portion, wherein a lumen extends between the first end portion and the second end portion; and
a central portion located between the first and second end portions, the central portion comprising an outer diameter that is greater than an outer diameter of either of the first and second end portions, and wherein the central portion is bound by stop surfaces perpendicular to a longitudinal axis of the connector pin;
inserting the second end portion into a second medical tube;
sliding a tubular sleeve over the first and second medical tubes and the connector pin, wherein the tubular sleeve comprises a first end and a second end and further defines a passageway extending between the first end and the second end, the passageway forming a stop surface that is perpendicular to an axis of the tubular sleeve such that the passageway is defined by: a uniform bore having a first diameter extending between the first end of the sleeve and the stop surface of the passageway; and a uniform bore having a second diameter extending between the stop surface of the passageway and the second end of the sleeve, wherein the first diameter is greater than the second diameter; and
engaging a first lock portion located within the passageway of the sleeve with a second lock portion of the connector pin.
21. The method of claim 20 , further comprising sliding the sleeve over the first medical tube prior to inserting the first end portion of the connector pin therein.
22. The method of claim 20 , wherein the first and second medical tubes are catheters.
23. The method of claim 20 , further comprising securing the sleeve to tissue.
24. The method of claim 23 , wherein securing the sleeve to tissue comprises suturing the sleeve to the tissue.
25. The method of claim 20 , further comprising delivering a substance from the first medical tube to the second medical tube through the connector pin.
26. The method of claim 20 , wherein sliding the sleeve over the first and second medical tubes and the connector pin comprises sliding the sleeve over the first and second medical tubes and the connector pin until the stop surface of the passageway of the sleeve contacts one of the stop surfaces of the central portion of the connector pin.
27. The method of claim 20 , wherein engaging the first lock portion located within the passageway of the sleeve with the second lock portion of the connector pin comprises deforming the sleeve sufficiently for an inwardly extending protrusion located within the passageway of the sleeve to engage a groove formed in the central portion of the connector pin.
28. The method of claim 20 , wherein sliding the sleeve over the first and second medical tubes and the connector pin comprises sliding the sleeve until it extends longitudinally beyond first and second ends of the connector pin.
29-30. (canceled)
31. A method of interconnecting sections of medical tubing, the method comprising:
providing a connector pin comprising: a first end portion and a second end portion, wherein a lumen extends between the first end portion and the second end portion; and a central portion located between the first and second end portions, the central portion comprising an outer diameter that is greater than an outer diameter of one or both of the first and second end portions, and wherein the central portion is bound by stop surfaces perpendicular to a longitudinal axis of the connector pin;
inserting the first end portion into a first medical tube:
inserting the second end portion into a second medical tube;
sliding a tubular sleeve over the first and second medical tubes and the connector pin, wherein the tubular sleeve comprises a first end and a second end and further defines a passageway extending between the first end and the second end, the passageway comprising a stop surface that is perpendicular to an axis of the sleeve such that the passageway is defined by: a uniform bore having a first diameter extending between the first end of the sleeve and the stop surface of the passageway; and a uniform bore having a second diameter extending between the stop surface of the passageway and the second end of the sleeve, wherein the first diameter is greater than the second diameter;
contacting one of the stop surfaces of the central portion of the connector pin with the stop surface of the passageway of the sleeve; and
engaging a first lock portion extending inwardly from the uniform bore of the first diameter of the passageway with a second lock portion associated with the connector pin.
32. The method of claim 31 , further comprising sliding the sleeve over the first medical tube prior to inserting the first end portion of the connector pin therein.
33. The method of claim 31 , further comprising delivering a substance from the first medical tube to the second medical tube through the connector pin.
34. The method of claim 31 , wherein sliding the sleeve over the first and second medical tubes and the connector pin comprises sliding the sleeve until it extends longitudinally beyond first and second ends of the connector pin.
35. The method of claim 31 , wherein engaging the first lock portion with the second lock portion comprises engaging a protrusion formed in the passageway of the sleeve with a groove formed in the outer diameter of the central portion of the connector pin.
36. The method of claim 31 , wherein the sleeve comprises a flexible material.
37. A method of interconnecting sections of medical tubing, the method comprising:
providing a connector pin comprising: a first end portion and a second end portion, wherein a lumen extends between the first end portion and the second end portion; and a central portion located between the first and second end portions, the central portion comprising an outer surface of a diameter that is greater than a diameter of both of the first and second end portions, and wherein the central portion is bound by stop surfaces perpendicular to a longitudinal axis of the connector pin;
inserting the first end portion into a first medical tube:
inserting the second end portion into a second medical tube;
sliding a tubular sleeve over the first and second medical tubes and the connector pin, wherein the tubular sleeve comprises a first end and a second end and further forms a stepped passageway extending between the first end and the second end, the stepped passageway defined by:
a first section comprising an inner surface defined by a bore of a first diameter, the bore of the first diameter extending both from an inwardly extending protrusion, formed along the inner surface of the first section, to the first end of the sleeve; and from the protrusion to a stop surface located within the stepped passageway; and
a second section comprising an inner surface defined by a bore of a second diameter, the bore of the second diameter extending from the stop surface of the stepped passageway to the second end of the sleeve, wherein the first diameter is greater than the second diameter; and
contacting one of the stop surfaces of the central portion of the connector pin with the stop surface located within the stepped passageway of the sleeve.
38. The method of claim 37 , further comprising placing the inwardly extending protrusion of the stepped passageway into a groove formed in the outer surface of the central portion of the connector pin.
39. The method of claim 37 , wherein the tubular sleeve comprises a flexible material.
40. The method of claim 37 , wherein sliding the sleeve over the first and second medical tubes and the connector pin comprises sliding the sleeve until it extends longitudinally beyond first and second ends of the connector pin.
41. The method of claim 20 , wherein the tubular sleeve comprises a flexible material.
Priority Applications (1)
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US11/964,999 US20080103476A1 (en) | 2004-05-13 | 2007-12-27 | Medical tubing connector assembly incorporating strain relief sleeve |
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US10/844,962 US7331613B2 (en) | 2004-05-13 | 2004-05-13 | Medical tubing connector assembly incorporating strain relief sleeve |
US11/964,999 US20080103476A1 (en) | 2004-05-13 | 2007-12-27 | Medical tubing connector assembly incorporating strain relief sleeve |
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US11/964,999 Abandoned US20080103476A1 (en) | 2004-05-13 | 2007-12-27 | Medical tubing connector assembly incorporating strain relief sleeve |
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US20050253389A1 (en) | 2005-11-17 |
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