CA1182706A - Device for introducing a catheter-cannula into a blood-vessel - Google Patents
Device for introducing a catheter-cannula into a blood-vesselInfo
- Publication number
- CA1182706A CA1182706A CA000401500A CA401500A CA1182706A CA 1182706 A CA1182706 A CA 1182706A CA 000401500 A CA000401500 A CA 000401500A CA 401500 A CA401500 A CA 401500A CA 1182706 A CA1182706 A CA 1182706A
- Authority
- CA
- Canada
- Prior art keywords
- cannula
- catheter
- introducer
- vessel
- blood
- 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.)
- Expired
Links
Classifications
-
- 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
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/06—Body-piercing guide needles or the like
- A61M25/0662—Guide tubes
- A61M25/0668—Guide tubes splittable, tear apart
-
- 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
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/06—Body-piercing guide needles or the like
- A61M25/0662—Guide tubes
- A61M25/0668—Guide tubes splittable, tear apart
- A61M2025/0675—Introducing-sheath slitters
Abstract
Abstract A device primarily intended for introducing soft, short plastic catheter-cannulas into a blood-vessel by means of a puncturing means, e.g a needle for puncturing the blood-vessel. An introducer-cannula of a stiffer material than the catheter-cannula is disposed on the outside thereof is introduced simultaneously with the catheter-cannula into the vessel. The introducer-cannula is severed or severable along its entire length and at its rear end provided with a gripping member , e.g a flap, for allowing its withdrawal from the catheter-cannula in the blood-vessel.
Description
The present invention relates to a device for introduc~
ing soft short catheter-cannulas into a blood~vessel and compris-ing a needle forpuncturin~ -the blood-vessel, the catheter-cannula beiny disposed on the outside of said needle for insertion in-to the blood-vessel together with the needle, a connection member being disposed at -the rear end of the catheter-cannula rerno-te from the blood-vessel in the position of use.
Plastic catheter-cannula inser-ted into a blood-vessel are used to a great extent for sampling of blood and administra-tion of drugs, fluid and blood. They have the advantage oversteel needles that the do not easily cause vessel and tissue injuries and haematoma formation when the patient moves.
A serious side-effect of plastic catherter-cannulas, however, is the high incidence of thrombosis and thrombophlebitis.
Thrombosis induced by contact with blood of plastic sur~aces is a major unsolved problem and a great number of factors are probably involved. I-t has, however, proved that soft catheter-cannulas~ especially those made of silicone elastomers are less thrombogenic than catheter-cannulas made of a stiffer material, e.g. PVC, polyethylene and Teflon .
These soft catheter-cannulas are, however, very dif-ficult to insert into a blood-vessel as they easily bend and get twisted.
In order to facilitate vascular insertion of long, sof-t catheter-cannulas a number of methods have been proposed, which, however, are not adapted for short catheter-cannulas, as on one hand they are traumatic for small, peripheral veins and arteries and on the other hand are expensive and cumbersome.
Among these methods can be men-tioned the use of stiff introducer-cannulas by e.g. Teflon , surgical methods, use of a steel winged needle through which the catheter-cannula is inser-ted and which splits longitudinally when i-t is removed from the vessel.
7~
In the European patent application No. 0,021,446 pub-lished 7 January 1981 to Intermedicat Gmb~, there is described an introducer-cannula of stifF plastic provided with longitudinal lines of weakness for insertion of long catheter-cannulas in a blood vessel. Af-ter insertion of the cathe~er-cannula -the intro-ducer-cannula is wi-thdrawn and removed from the catheter-cannula by severing its two halves along -the lines of weakness. This device is, however, only adapted for long catheter-cannulas and not for the insertion of sof-t, short catheter-cannulas into veins and arteries.
I'here is, however, a method presently in use and adap-ted for insertion of short, soft catheter-cannulas. The method is developed by VIC~A, a division of Travenol Laboratories, USA.
The device used comprises a longitudinally slotted needle which permits the insertion of a 5 cm long silicone elastomer cathe-ter-cannula armoured with a metal spring stylet. After insertion of the catheter-cannula the needle and the stylet are wi-thdrawn.
Both device and method are, however, not free from criticism. Vein puncture is difficult and -traumatic because of the slotted needle which has a diameter significantly larger than that of the silicone elastomer catheter-cannula, withdrawal of the metal spring stylet may sometimes be difficul-t and the device is expensive.
In the European patent application No. Q,002~607 there is described a device for implanting a pacemaker electrode through the subclavion vein into the heart. The device ~0 comprises an introducer sleeve disposed on the outside o-F the needle and provided with a longitudinal line of weakness along which the in-troducer sleeve can be severed and removed frorn the body when the electrode has been placed in the clesired position.
A device is adap-ted for insertion of long, rigid implants (pacemaker electrodes) through the subclavion vein and is not adapted for insertion oF soft, short catheter-cannulas into peripheral veins and arteries.
The present invention provides a device mainly for the insertion of soft, short catheter-cannulas into peripheral veins and arteries~ The device is easy to handle, the catheter-cannula is given support during the insertion, and said support is easily removable from the catheter-cannula when this is located in the desired position in the vessel.
Thus, according to the present invention there is provided a device for introducing a soft short catheter-cannula into a blood-vessel and comprising a cannula for puncturing the blood-vessel, said catheter-cannula being arranged on the outside of said cannula to be introduced into the blood-vessel together with the cannula, a connection member being disposed at the rear end of the catheter-cannula remote from the blood-vessel in the position o-F use, an introducer cannula disposed on the outside of the catheter-cannula and extending over the substantial length of and being stiffer than the catheter-cannula, said introducer-cannula being adapted to be introduced into the blood-vessel together with the catheter-cannula and the cannula, said introducer-cannula beiny severed or severable along its length and at its rear end provided wi-th at least one gripping member b~ means of which the introducer-cannula is withdrawn from the blood-vessel and removed from the catheter-cannula with simultaneolJs severance.
Thus, according to the inven-tion an introducer-cannula is disposed on the outside of the catheter-cannula extending over the substantial length o-f and is stiffer -than the ca-theter-cannula, said introducer-cannula being intended to be introduced into the blood-vessel together with the catheter-cannula and said in-troducer-cannula being severecl or severable along its length and at its rear end provided with at least one gripping member for removing the introducer-cannula from the catheter-cannula.
The invention will be further described with reference to the accompany drawings in which Fig. 1 is a section illustrating what would happen when one tries to introduce a soft catheter-cannula into a blood-vessel only by means oF a needle;
Fig. 2 is a corresponding section showing a device according to the invention in a position where the introducer~
cannula : i - 3a -:~æ~
being withdrawn from the catheter-cannula;
Fig. 3 is a side view of an embodiment of the introducer-cannula according to the invention;
Fig. 4 is a front view o~ the introducer-cannula accord-ing to Fig. 3;
Fig. 5 is a perspective view of another elnbodiment of -the introducer-cannula;
Fig~ 6 is a longitudinal sec-tion through a fur-ther embodiment of the invention;
Fig. 7 is a longitudinal section through the catheter-cannula according to Fig. 6;
Fig. 8 is a longitudinal sec-tion through the introducer-cannula according to Fig, 6;
Fig. 9 is a longitudinal section through a further embodiment of the invention;
Fig. 10 is a section through another embodiment;
F~g. 11 shows the introducer-cannula according to Fig.
10;
Fig. 12 is a section through a further embodiment;
Fig. 13 is a section -through a further embodiment;
Fig. 14 is a section according to the line XIV-XIV in Fig. 13, and Fig. 15 is a perspective view of a modified insertion end of the introducer-cannula.
In Fig. 1 is illustrated what would happen if one tries to introduce a catheter-cannula 2 of a soft plastic ma-terial, e.g. silicone elastomer or polyurethane, on a needle into a peri-pheral blood-vessel 14. The catheter-cannula 2 will not be in-troduced into the blood-vessel but instead be crumpled on the needle.
An outer rigid suppox-t is therefore necessary for enabling the inser-tion of such a soft ca-theter-cannula into a `~~ood-vessel. According to the embodiment shown in Figs. 2-4 this outer support is provided by an introducer-cannula 3 of a rigid and resilient plastic material. The introducer-cannu]a 3 is on its lower side provided with a slit 12 extending alony the entire length thereof. The introducer-cannula 3 has to be made of a material which is resilient enough to keep the edges of the slit 12 pressed against each other.
The introducer-cannula 3 is a-t its outer end provided with a gripping member 11 in the form of an upright flap by means of which the in-troducer-cannula can be withdrawn from the catheter-cannula 2 and the blood-vessel 14 as is shown in Fig. 2.
In the embodiment shown in Fig. 5 the introducer-cannula 3 has two diametrically opposed longitudinal lines of weakness 13, e.g. grooves or perforations and two gripping members 11 by means of which the introducer-cannula 3 can be severed along the lines of weakness 13.
In Fig. 6 is shown another embodiment together with a conventional needle 1. The needle 1 is at its end remote from the tip provided with a plastic hub 4 provided with a connection opening closed by a plug 5. The hub 4 is also provided with an upright flap 6 constituting a support for the thumb when the needle 1 is inserted into the blood-vessel.
The catheter-cannula 2 is tightly arranged on the out-side of the needle 1. A connection member 7 is arranged a~ the end of the catheter-cannula 2 remote from the blood-vessel as seen in the position of use, said connection member 7 being in contact with the flap 6 of the hub 4. ~he connection member 7 is at its upper side provided with a connection opening 8 for the c~nnection of a syringe. At the underside of the end facing the catheter-cannula 2 the connection member is provided with an edge-provided means or knife 9, which eOg.
c~n have the shape of a 7~
r~hombic pyramid. The connection member 7 is further provided with a pair of wings projecting laterally (shown in Fig. 13).
The introducer-cannula 3 is arranged on -the outside of the catheter-cannula 2 and extends over -the substantial length thereof and has an inner diame-ter approximately e~ual to the outer diameter of -the catheter-cannula 2. The wall thickrless should preferably be as low asC~out 0.2 mm. The effective lenyth of the catheter-cannula as well as the introducer-cannula is about 5 cm. Preferably the tip of the cathe-ter-cannula overpasses that of the intrGducer-cannula by some mm in order -~o avoid that the retraction of the introducer-cannula from the vessel will be followed by that of the catheter-cannula. It can, however, prove to be suitable to have the tip of the introducer-cannula 3 over-pass that of the catheter-cannula 2 instead. It has to be pointed out that the different components are shown on an enlarged scale for the sake of clarity. Besides the components 1,2 and 3 which in reality are tightly fitted to each other are shown spaced from each other.
The introducer-cannula 3 has at i-ts outer end an en-larged portion 10 extending over a part of the connection member7 of the catheter-cannula 2. Said portion 10 is provided with an upright flap 11 making a support for the index finger when the whole device comprising needle 1, catheter-cannula 2 and intro-ducer-cannula 3 is introduced into the vessel. The flap 11 also makes a support for the index finger and the thumb when the introducer-cannula 3 is withdrawn from the vessel.
The enlarged portion 10 of the introducer-cannula 3 is on its underside provided with a longitudinal slit 12 closing up in a point and continued by a longitudinal line of weakness 13, e.g. a groove or perfora-tion. 'rhe introducer~cannula can, however lack the line of weakness if its walls are thin enough to be easily slit by the knife 9. The knife 9 is located in the slit 12 and projects therefrom.
The device is used in the following way. The blood-vessel, a peripheral vein or artery, eOg. on the back oE the hand, is punctured by means of the needle l and the complex cornprisin~J
needle l, catheter-cannula 2 and introducer-cannula 3 is intro-duced into -the vessel by pressing the thumb aya:inst the f~ap 6 of the hub 4, while the flap ll of the introducer-cannula 3forms a support for the index finger. The needle l and the in-troducer-cannula 3 form rigid inner and outer supports for the cathe-ter-cannula 2 along the en-tire length -thereof during the insertion.
When the catheter-cannula 2 has been placed in the de-sired position the introducer-cannula 3 is withdrawn from the vessel by drawing up and dorsally its flap ll, while the index finger and thumb of the other hand hold the hub 4 of the needle and the long finger and ring finger keep in place the catheter-cannula 2 by gripping the wings (shown in Fig. 13) of the con-nection membcr 7. The introducer-cannula 3 will during its with-drawal be split by the knife 9 along the line of weakness when present.
The splitting of the introducer cannula 3 starts immed-iately at its withdrawal, i.e. when it is still located in the vessel.
According to a modified embodiment the knife 9 is loca-ted obli~uely in relation to the axial direction of the device, at which the introducer-cannula 3 will be split along a helical line which would further facilitate its withdrawal from the catheter-cannula 2 and the vessel.
When the introducer-cannula 3 has been withdrawn the needle l is withdrawn from the catheter-cannula 2. In order to avoid the leakage of blood around and through the catheter-cannula 2 one finger can be pressed the tip located in vessel.
A portion of the catheter cannula 2, approximately 5 mm~
Chould be located outside the body and -the device is fastened to the skin by adhesive tapes.
Accordinq to the embodiment shown in Fiy. 9 the knife 9 is arranged on a ring-shaped member 15 connected with the connec-tion member 7 of the cathe-ter-cannula 2 and loca-ted before this so that the in-troducer-cannula extends through said ring 15. By in this way "moving" the kniEe forward as compared to -the above embodiments the withdrawal of the introducer-cannula 3 is facili-tated. Besides the ring lS provides a support for the introducer-cannula when 16 is withdrawn upwards-backwards.
According to the embodiment shown in Figs. 10 and 11 a connecting member 16 is arranged between the introducer-cannula 3 and the needle hub 4, for providing a simultaneous withdrawal of the needle 1 and the introducer-cannula 3 from the catheter-cannula
ing soft short catheter-cannulas into a blood~vessel and compris-ing a needle forpuncturin~ -the blood-vessel, the catheter-cannula beiny disposed on the outside of said needle for insertion in-to the blood-vessel together with the needle, a connection member being disposed at -the rear end of the catheter-cannula rerno-te from the blood-vessel in the position of use.
Plastic catheter-cannula inser-ted into a blood-vessel are used to a great extent for sampling of blood and administra-tion of drugs, fluid and blood. They have the advantage oversteel needles that the do not easily cause vessel and tissue injuries and haematoma formation when the patient moves.
A serious side-effect of plastic catherter-cannulas, however, is the high incidence of thrombosis and thrombophlebitis.
Thrombosis induced by contact with blood of plastic sur~aces is a major unsolved problem and a great number of factors are probably involved. I-t has, however, proved that soft catheter-cannulas~ especially those made of silicone elastomers are less thrombogenic than catheter-cannulas made of a stiffer material, e.g. PVC, polyethylene and Teflon .
These soft catheter-cannulas are, however, very dif-ficult to insert into a blood-vessel as they easily bend and get twisted.
In order to facilitate vascular insertion of long, sof-t catheter-cannulas a number of methods have been proposed, which, however, are not adapted for short catheter-cannulas, as on one hand they are traumatic for small, peripheral veins and arteries and on the other hand are expensive and cumbersome.
Among these methods can be men-tioned the use of stiff introducer-cannulas by e.g. Teflon , surgical methods, use of a steel winged needle through which the catheter-cannula is inser-ted and which splits longitudinally when i-t is removed from the vessel.
7~
In the European patent application No. 0,021,446 pub-lished 7 January 1981 to Intermedicat Gmb~, there is described an introducer-cannula of stifF plastic provided with longitudinal lines of weakness for insertion of long catheter-cannulas in a blood vessel. Af-ter insertion of the cathe~er-cannula -the intro-ducer-cannula is wi-thdrawn and removed from the catheter-cannula by severing its two halves along -the lines of weakness. This device is, however, only adapted for long catheter-cannulas and not for the insertion of sof-t, short catheter-cannulas into veins and arteries.
I'here is, however, a method presently in use and adap-ted for insertion of short, soft catheter-cannulas. The method is developed by VIC~A, a division of Travenol Laboratories, USA.
The device used comprises a longitudinally slotted needle which permits the insertion of a 5 cm long silicone elastomer cathe-ter-cannula armoured with a metal spring stylet. After insertion of the catheter-cannula the needle and the stylet are wi-thdrawn.
Both device and method are, however, not free from criticism. Vein puncture is difficult and -traumatic because of the slotted needle which has a diameter significantly larger than that of the silicone elastomer catheter-cannula, withdrawal of the metal spring stylet may sometimes be difficul-t and the device is expensive.
In the European patent application No. Q,002~607 there is described a device for implanting a pacemaker electrode through the subclavion vein into the heart. The device ~0 comprises an introducer sleeve disposed on the outside o-F the needle and provided with a longitudinal line of weakness along which the in-troducer sleeve can be severed and removed frorn the body when the electrode has been placed in the clesired position.
A device is adap-ted for insertion of long, rigid implants (pacemaker electrodes) through the subclavion vein and is not adapted for insertion oF soft, short catheter-cannulas into peripheral veins and arteries.
The present invention provides a device mainly for the insertion of soft, short catheter-cannulas into peripheral veins and arteries~ The device is easy to handle, the catheter-cannula is given support during the insertion, and said support is easily removable from the catheter-cannula when this is located in the desired position in the vessel.
Thus, according to the present invention there is provided a device for introducing a soft short catheter-cannula into a blood-vessel and comprising a cannula for puncturing the blood-vessel, said catheter-cannula being arranged on the outside of said cannula to be introduced into the blood-vessel together with the cannula, a connection member being disposed at the rear end of the catheter-cannula remote from the blood-vessel in the position o-F use, an introducer cannula disposed on the outside of the catheter-cannula and extending over the substantial length of and being stiffer than the catheter-cannula, said introducer-cannula being adapted to be introduced into the blood-vessel together with the catheter-cannula and the cannula, said introducer-cannula beiny severed or severable along its length and at its rear end provided wi-th at least one gripping member b~ means of which the introducer-cannula is withdrawn from the blood-vessel and removed from the catheter-cannula with simultaneolJs severance.
Thus, according to the inven-tion an introducer-cannula is disposed on the outside of the catheter-cannula extending over the substantial length o-f and is stiffer -than the ca-theter-cannula, said introducer-cannula being intended to be introduced into the blood-vessel together with the catheter-cannula and said in-troducer-cannula being severecl or severable along its length and at its rear end provided with at least one gripping member for removing the introducer-cannula from the catheter-cannula.
The invention will be further described with reference to the accompany drawings in which Fig. 1 is a section illustrating what would happen when one tries to introduce a soft catheter-cannula into a blood-vessel only by means oF a needle;
Fig. 2 is a corresponding section showing a device according to the invention in a position where the introducer~
cannula : i - 3a -:~æ~
being withdrawn from the catheter-cannula;
Fig. 3 is a side view of an embodiment of the introducer-cannula according to the invention;
Fig. 4 is a front view o~ the introducer-cannula accord-ing to Fig. 3;
Fig. 5 is a perspective view of another elnbodiment of -the introducer-cannula;
Fig~ 6 is a longitudinal sec-tion through a fur-ther embodiment of the invention;
Fig. 7 is a longitudinal section through the catheter-cannula according to Fig. 6;
Fig. 8 is a longitudinal sec-tion through the introducer-cannula according to Fig, 6;
Fig. 9 is a longitudinal section through a further embodiment of the invention;
Fig. 10 is a section through another embodiment;
F~g. 11 shows the introducer-cannula according to Fig.
10;
Fig. 12 is a section through a further embodiment;
Fig. 13 is a section -through a further embodiment;
Fig. 14 is a section according to the line XIV-XIV in Fig. 13, and Fig. 15 is a perspective view of a modified insertion end of the introducer-cannula.
In Fig. 1 is illustrated what would happen if one tries to introduce a catheter-cannula 2 of a soft plastic ma-terial, e.g. silicone elastomer or polyurethane, on a needle into a peri-pheral blood-vessel 14. The catheter-cannula 2 will not be in-troduced into the blood-vessel but instead be crumpled on the needle.
An outer rigid suppox-t is therefore necessary for enabling the inser-tion of such a soft ca-theter-cannula into a `~~ood-vessel. According to the embodiment shown in Figs. 2-4 this outer support is provided by an introducer-cannula 3 of a rigid and resilient plastic material. The introducer-cannu]a 3 is on its lower side provided with a slit 12 extending alony the entire length thereof. The introducer-cannula 3 has to be made of a material which is resilient enough to keep the edges of the slit 12 pressed against each other.
The introducer-cannula 3 is a-t its outer end provided with a gripping member 11 in the form of an upright flap by means of which the in-troducer-cannula can be withdrawn from the catheter-cannula 2 and the blood-vessel 14 as is shown in Fig. 2.
In the embodiment shown in Fig. 5 the introducer-cannula 3 has two diametrically opposed longitudinal lines of weakness 13, e.g. grooves or perforations and two gripping members 11 by means of which the introducer-cannula 3 can be severed along the lines of weakness 13.
In Fig. 6 is shown another embodiment together with a conventional needle 1. The needle 1 is at its end remote from the tip provided with a plastic hub 4 provided with a connection opening closed by a plug 5. The hub 4 is also provided with an upright flap 6 constituting a support for the thumb when the needle 1 is inserted into the blood-vessel.
The catheter-cannula 2 is tightly arranged on the out-side of the needle 1. A connection member 7 is arranged a~ the end of the catheter-cannula 2 remote from the blood-vessel as seen in the position of use, said connection member 7 being in contact with the flap 6 of the hub 4. ~he connection member 7 is at its upper side provided with a connection opening 8 for the c~nnection of a syringe. At the underside of the end facing the catheter-cannula 2 the connection member is provided with an edge-provided means or knife 9, which eOg.
c~n have the shape of a 7~
r~hombic pyramid. The connection member 7 is further provided with a pair of wings projecting laterally (shown in Fig. 13).
The introducer-cannula 3 is arranged on -the outside of the catheter-cannula 2 and extends over -the substantial length thereof and has an inner diame-ter approximately e~ual to the outer diameter of -the catheter-cannula 2. The wall thickrless should preferably be as low asC~out 0.2 mm. The effective lenyth of the catheter-cannula as well as the introducer-cannula is about 5 cm. Preferably the tip of the cathe-ter-cannula overpasses that of the intrGducer-cannula by some mm in order -~o avoid that the retraction of the introducer-cannula from the vessel will be followed by that of the catheter-cannula. It can, however, prove to be suitable to have the tip of the introducer-cannula 3 over-pass that of the catheter-cannula 2 instead. It has to be pointed out that the different components are shown on an enlarged scale for the sake of clarity. Besides the components 1,2 and 3 which in reality are tightly fitted to each other are shown spaced from each other.
The introducer-cannula 3 has at i-ts outer end an en-larged portion 10 extending over a part of the connection member7 of the catheter-cannula 2. Said portion 10 is provided with an upright flap 11 making a support for the index finger when the whole device comprising needle 1, catheter-cannula 2 and intro-ducer-cannula 3 is introduced into the vessel. The flap 11 also makes a support for the index finger and the thumb when the introducer-cannula 3 is withdrawn from the vessel.
The enlarged portion 10 of the introducer-cannula 3 is on its underside provided with a longitudinal slit 12 closing up in a point and continued by a longitudinal line of weakness 13, e.g. a groove or perfora-tion. 'rhe introducer~cannula can, however lack the line of weakness if its walls are thin enough to be easily slit by the knife 9. The knife 9 is located in the slit 12 and projects therefrom.
The device is used in the following way. The blood-vessel, a peripheral vein or artery, eOg. on the back oE the hand, is punctured by means of the needle l and the complex cornprisin~J
needle l, catheter-cannula 2 and introducer-cannula 3 is intro-duced into -the vessel by pressing the thumb aya:inst the f~ap 6 of the hub 4, while the flap ll of the introducer-cannula 3forms a support for the index finger. The needle l and the in-troducer-cannula 3 form rigid inner and outer supports for the cathe-ter-cannula 2 along the en-tire length -thereof during the insertion.
When the catheter-cannula 2 has been placed in the de-sired position the introducer-cannula 3 is withdrawn from the vessel by drawing up and dorsally its flap ll, while the index finger and thumb of the other hand hold the hub 4 of the needle and the long finger and ring finger keep in place the catheter-cannula 2 by gripping the wings (shown in Fig. 13) of the con-nection membcr 7. The introducer-cannula 3 will during its with-drawal be split by the knife 9 along the line of weakness when present.
The splitting of the introducer cannula 3 starts immed-iately at its withdrawal, i.e. when it is still located in the vessel.
According to a modified embodiment the knife 9 is loca-ted obli~uely in relation to the axial direction of the device, at which the introducer-cannula 3 will be split along a helical line which would further facilitate its withdrawal from the catheter-cannula 2 and the vessel.
When the introducer-cannula 3 has been withdrawn the needle l is withdrawn from the catheter-cannula 2. In order to avoid the leakage of blood around and through the catheter-cannula 2 one finger can be pressed the tip located in vessel.
A portion of the catheter cannula 2, approximately 5 mm~
Chould be located outside the body and -the device is fastened to the skin by adhesive tapes.
Accordinq to the embodiment shown in Fiy. 9 the knife 9 is arranged on a ring-shaped member 15 connected with the connec-tion member 7 of the cathe-ter-cannula 2 and loca-ted before this so that the in-troducer-cannula extends through said ring 15. By in this way "moving" the kniEe forward as compared to -the above embodiments the withdrawal of the introducer-cannula 3 is facili-tated. Besides the ring lS provides a support for the introducer-cannula when 16 is withdrawn upwards-backwards.
According to the embodiment shown in Figs. 10 and 11 a connecting member 16 is arranged between the introducer-cannula 3 and the needle hub 4, for providing a simultaneous withdrawal of the needle 1 and the introducer-cannula 3 from the catheter-cannula
2~ The connecting member 16 consists of a loop, threads or the like extending from the rear end of the introducer-cannula 3 and attached to or around the flap 6 of the hub 4. In Fig. 11 is shown that the thread 16 is folded for admitting the introducer-cannula 3 and cathether-cannula 2 to be introduced a further dis-tance into the blood-vessel than the needle 1.
In Fig. 12 there is shown an embodirnent where the in-troducer-cannula 3 has been provided with a tip and constitutes the puncturing means or needle. The in-troducer-cannula 3 is in this embodiment provided with two longitudinal lines of weakness, and thus two knives 9 are arranged on the ring 15 projecting from the connection member 7 of the catheter-cannula. According to the embodiment shown in Figs. 13 and 14 the needle hub 4 is pro-vided with a pair of forwards projecting flaps 18, on the external sides of which guides 19 for the ends of the connecting threads 16 are formed. After the insertion of the introducer-cannula 3 and the catheter-cannula 2 into the blood-vessel by means oF -the needle 1, this can be ]~ept s-till while the introducer-cannula ~ - 8 -~dr and the catheter-cannula are inserted a further distance into the vessel, at which the ends of the connecting threads 16 are dis-placed in the guides 19 to the posi-tion shown in Fig. 13. ~t the withdrawal of the needle 1 the introd~cer-cannula 3 will also be withdrawn from the catheter-cannula 2.
In Fig. l5 there is shown an embodirnen-t where the inser-tion end of the introducer-cannuLa 3 is thinner than the rest of the introducer-cannula for facilitating the introduction. This thinner portion 20 is slit, said slit 20 forming a continuation of the slit 12 or the line of weakness 13 in order to facilitate the withdrawal of the introducer-cannula 3.
It is, of course, within the scope of the invention to replace and combine parts of the embodiments shown with each other in different ways.
~ _
In Fig. 12 there is shown an embodirnent where the in-troducer-cannula 3 has been provided with a tip and constitutes the puncturing means or needle. The in-troducer-cannula 3 is in this embodiment provided with two longitudinal lines of weakness, and thus two knives 9 are arranged on the ring 15 projecting from the connection member 7 of the catheter-cannula. According to the embodiment shown in Figs. 13 and 14 the needle hub 4 is pro-vided with a pair of forwards projecting flaps 18, on the external sides of which guides 19 for the ends of the connecting threads 16 are formed. After the insertion of the introducer-cannula 3 and the catheter-cannula 2 into the blood-vessel by means oF -the needle 1, this can be ]~ept s-till while the introducer-cannula ~ - 8 -~dr and the catheter-cannula are inserted a further distance into the vessel, at which the ends of the connecting threads 16 are dis-placed in the guides 19 to the posi-tion shown in Fig. 13. ~t the withdrawal of the needle 1 the introd~cer-cannula 3 will also be withdrawn from the catheter-cannula 2.
In Fig. l5 there is shown an embodirnen-t where the inser-tion end of the introducer-cannuLa 3 is thinner than the rest of the introducer-cannula for facilitating the introduction. This thinner portion 20 is slit, said slit 20 forming a continuation of the slit 12 or the line of weakness 13 in order to facilitate the withdrawal of the introducer-cannula 3.
It is, of course, within the scope of the invention to replace and combine parts of the embodiments shown with each other in different ways.
~ _
Claims (12)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A device for introducing a soft short catheter-cannula into a blood-vessel and comprising a cannula for puncturing the blood-vessel, said catheter-cannula being arranged on the outside of said cannula to be introduced into the blood-vessel together with the cannula, a connection member being disposed at the rear end of the catheter-cannula remote from the blood-vessel in the position of use, an introducer- cannula disposed on the outside of the catheter-cannula and extending over the substantial length of and being stiffer than the catheter-cannula, said introducer-cannula being adapted to be introduced into the blood-vessel together with the catheter-cannula and the cannula, said introducer-cannula being severed or severable along its length and at its rear end provided with at least one gripping member by means of which the introducer-cannula is withdrawn from the blood-vessel and removed from the catheter-cannula with simultaneous severance.
2. A device according to claim 1, in which said connection member o-f the catheter-cannula is provided with at least one severing means for severing the introducer-cannula on its withdrawal and removal from the blood-vessel after the introduction of the catheter-cannula to the desired position.
3. A device according to claim 2, in which the severing means is an edge, against which the introducer-cannula is to be opened or split on withdrawal from the blood-vessel.
4. A device according to claim 2, in which the introducer-cannula at its rear end remote from the blood-vessel in the position of use is provided with a slit and so arranged in relation to the connection member of the catheter-cannula that said severing means is located in said slit.
5. A device according to claim 4, in which the introducer-cannula is provided with at least one longitudinal ?ine of weakness connecting to said slit in axial direction.
6. A device according to claim 4, in which the introducer-cannula is provided with a helical line of weakness extending over its length and connecting to said slit.
7. A device according to claim 6, in which the severing means is arranged at an angle to the axial direction of the device.
8. A device according to claim 1, in which the introducer-cannula is provided with a slit extending over its entire length, the introducer-cannula being made of a resilient material which keeps the edges of the slit pressed against each other.
9. A device according to claim 2, in which the introducer-cannula is passed through a ring-shaped member close to its rear end, said ring-shaped member being connected with the connection member of the catheter-cannula and providing a support for the introducer-cannula on its withdrawal from the catheter-cannula.
10. A device according to claim 9, in which said ring-shaped member is provided with said severing means.
11. A device according to claim 1, in which at least one connecting member is arranged for connecting the rear end of the introducer-cannula with the hub of the cannula for providing a simultaneous withdrawal of the cannula and the introducer-cannula from the catheter-cannula.
12. A device according to claim 11, in which said connecting member is limitedly displaceably attached to a hub of the cannula in the longitudinal direction thereof.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8102576-9 | 1981-04-23 | ||
| SE8102576A SE426023B (en) | 1981-04-23 | 1981-04-23 | DEVICE BLA FOR INFANTRY OF CATHEDRES IN BLOOD BLOOD |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1182706A true CA1182706A (en) | 1985-02-19 |
Family
ID=20343659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000401500A Expired CA1182706A (en) | 1981-04-23 | 1982-04-22 | Device for introducing a catheter-cannula into a blood-vessel |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US4581019A (en) |
| EP (1) | EP0091434B1 (en) |
| JP (1) | JPS58500597A (en) |
| AT (1) | ATE25818T1 (en) |
| AU (1) | AU561974B2 (en) |
| BR (1) | BR8207873A (en) |
| CA (1) | CA1182706A (en) |
| DE (1) | DE3275630D1 (en) |
| FI (1) | FI69244C (en) |
| SE (1) | SE426023B (en) |
| WO (1) | WO1982003558A1 (en) |
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| KR20230007403A (en) | 2020-04-23 | 2023-01-12 | 바드 액세스 시스템즈, 인크. | RAPIDLY INSERTABLE CENTRAL CATHETERS INCLUDING CATHETER ASSEMBLIES |
| CN215608689U (en) | 2020-05-21 | 2022-01-25 | 巴德阿克塞斯系统股份有限公司 | Rapidly insertable central catheter including a catheter assembly |
| KR20230043193A (en) * | 2020-07-31 | 2023-03-30 | 바드 액세스 시스템즈, 인크. | TWO-PIECE RAPIDLY INSERTABLE CENTRAL CATHETERS, INTRODUCERS THEREFOR, AND METHODS THEREOF |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1430651A (en) * | 1965-04-08 | 1966-03-04 | Sorenson Res Corp | Set for placing an intravenous probe and method for its application |
| US3382872A (en) * | 1965-06-07 | 1968-05-14 | Melvin L. Rubin | Venous catheter and needle |
| DK109789C (en) * | 1966-11-17 | 1968-07-01 | D E H Ved S Husted Andersen | Needle for insertion of an intravenous catheter. |
| US3565074A (en) * | 1969-04-24 | 1971-02-23 | Becton Dickinson Co | Indwelling arterial cannula assembly |
| CA926251A (en) * | 1969-05-22 | 1973-05-15 | W. Lange Carl | Detachable guide needle |
| DK121531B (en) * | 1969-11-13 | 1971-10-25 | Transcodan | Needle for insertion of an intravenous catheter. |
| CA935059A (en) * | 1970-02-27 | 1973-10-09 | Jewett-Ashley Holding Corp. | Catheter device |
| US3713442A (en) * | 1970-09-08 | 1973-01-30 | H Walter | Split needle assembly for catheter tube |
| US3682173A (en) * | 1970-10-16 | 1972-08-08 | Vicra Sterile Inc | Separable catheter insertion device |
| DE2104211B1 (en) * | 1971-01-29 | 1971-12-23 | Fa B Braun, 3508 Melsungen | Puncture cannula for the introduction of a flexible catheter |
| US3902501A (en) * | 1973-06-21 | 1975-09-02 | Medtronic Inc | Endocardial electrode |
| US4166469A (en) * | 1977-12-13 | 1979-09-04 | Littleford Philip O | Apparatus and method for inserting an electrode |
| FR2439591A1 (en) * | 1978-10-25 | 1980-05-23 | Technological Supply | DEVICE FOR INTRODUCING A CATHETER OR PROBE INTO A BLOOD VESSEL |
| US4306562A (en) * | 1978-12-01 | 1981-12-22 | Cook, Inc. | Tear apart cannula |
| DE2926572C2 (en) * | 1979-06-30 | 1982-04-15 | B. Braun Melsungen Ag, 3508 Melsungen | Divisible short catheter made of plastic |
| SE426023B (en) * | 1981-04-23 | 1982-12-06 | Bengt Gustavsson | DEVICE BLA FOR INFANTRY OF CATHEDRES IN BLOOD BLOOD |
| DE3117802A1 (en) * | 1981-05-06 | 1982-11-25 | Max Dr. 8520 Erlangen Hubmann | CATHETER CUTLERY |
| US4473067A (en) * | 1982-04-28 | 1984-09-25 | Peter Schiff | Introducer assembly for intra-aortic balloons and the like incorporating a sliding, blood-tight seal |
-
1981
- 1981-04-23 SE SE8102576A patent/SE426023B/en not_active IP Right Cessation
-
1982
- 1982-04-22 AT AT82901312T patent/ATE25818T1/en not_active IP Right Cessation
- 1982-04-22 DE DE8282901312T patent/DE3275630D1/en not_active Expired
- 1982-04-22 WO PCT/SE1982/000127 patent/WO1982003558A1/en active IP Right Grant
- 1982-04-22 US US06/456,047 patent/US4581019A/en not_active Expired - Fee Related
- 1982-04-22 JP JP57501386A patent/JPS58500597A/en active Pending
- 1982-04-22 EP EP82901312A patent/EP0091434B1/en not_active Expired
- 1982-04-22 AU AU83919/82A patent/AU561974B2/en not_active Ceased
- 1982-04-22 BR BR8207873A patent/BR8207873A/en unknown
- 1982-04-22 CA CA000401500A patent/CA1182706A/en not_active Expired
-
1983
- 1983-05-23 FI FI831821A patent/FI69244C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0091434B1 (en) | 1987-03-11 |
| ATE25818T1 (en) | 1987-03-15 |
| FI831821L (en) | 1983-05-23 |
| AU8391982A (en) | 1982-11-04 |
| SE8102576L (en) | 1982-10-24 |
| US4581019A (en) | 1986-04-08 |
| SE426023B (en) | 1982-12-06 |
| FI69244B (en) | 1985-09-30 |
| BR8207873A (en) | 1983-08-30 |
| AU561974B2 (en) | 1987-05-21 |
| DE3275630D1 (en) | 1987-04-16 |
| EP0091434A1 (en) | 1983-10-19 |
| JPS58500597A (en) | 1983-04-21 |
| WO1982003558A1 (en) | 1982-10-28 |
| FI831821A0 (en) | 1983-05-23 |
| FI69244C (en) | 1986-01-10 |
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