Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2118631 A
Publication typeGrant
Publication date24 May 1938
Filing date3 Apr 1935
Priority date3 Apr 1935
Publication numberUS 2118631 A, US 2118631A, US-A-2118631, US2118631 A, US2118631A
InventorsCharles Wappler Frederick
Original AssigneeCharles Wappler Frederick
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Catheter stylet
US 2118631 A
Images(1)
Previous page
Next page
Description  (OCR text may contain errors)

May 24, 1938. F. c. WAPFLER 2,118,631

CATHETER STYLET Filed April 3, 1955 IN VEN 1 OR,

AgORNEY.

Patented May 24, 1938 UNITED STATES PATENT OFFICE 2 Claims.

My present invention relates generally to surgical instruments, and has particular reference to catheter stylets.

The insertion of a urethral catheter (usually composed of soft, flexible rubber or the like) requires the aid of a stylet for imparting a certain degree of rigidity to the catheter. It has been customary practice to employ a stylet in the form of a rigid, solid wire; and to facilitate prop- ]0 er insertion of the catheter the end of the wire is usually curved, whereby a similar curvature is imparted to the tip of the catheter.

Good practice prescribes that a urethral catheter have at least two openings at its inner end,

so that if one of them should become clogged, the other would still be available for draining the bladder. Usually, these openings are laterally disposed, but in a preferred form of catheter, one of the openings is at the very tip of the catheter,

arranged along an, oblique plane.

Despite precautions that are regularly taken, the forward end of the usual stylet frequently protrudes itself from one of the catheter eyes, and this is especially likely to happen. with catheters having a forward opening. Because of the rigid and unyielding character of ordinary stylets, such accidental protrusion is dangerous and oftentimes results in injury to the patient.

Itv is a general object of my present invention 0 to provide a stylet, of improved structural character, whereby an unusually desirable degree of rigidity is imparted tov the catheter, notwithstanding the'fact that, the stylet itself is of readily yieldable character, adapted to yield instantaneously when its, tip'encounters an obstacle.

Accordingly, in the event that the tip of the present improved, type of stylet should accidentally protrude from one of the eyes of the catheter, the likelihood of injury is reduced, to a minimum because of the readiness With which the stylet will yield.

A stylet constructed in accordance with my present invention embodies not only the foregoing desirable characteristics, but is, in addition, formed in. such a manner that its tip is of relatively blunt and harmless form. Accordingly, it is unusually safe to employ the present type of stylet, even in connection with catheters which have an opening at the extreme front tip thereof.

50 I have found that the apparently paradoxical combination of yieldability, on the. one hand, and rigidity, on the other hand, is capable of simultaneous attainment by forming the stylet of a helically wound strip of spring metal, such as 55 stainless steel. Such a body, when pushed end- (c1. 12s s49) wise, and unimpeded, embodies a remarkable degree of rigidity. At the same time, it is readily flexible so that it adjusts itself readily to curvatures in the urethra. What is of most importance is the fact that when it encounters an un- 5 yielding obstacle, it buckles with readiness and manifests an unusually great and desirable yieldability.

One of the features of my invention lies in providing a stylet of this helically wound type, with 10 the ends of the resultant helix plugged by means of a rounded and relatively harmless tip. At least one end portion of the stylet is permanently set into a predetermined gentle curvature.

In a preferred embodiment, I have found it ad- 15 visable to employ a flexible, resilient, stiffening wire which extends longitudinally through the helix, and which imparts a desirable additional stiffness without detracting from the yieldable characteristics of the helically wound strip.

I achieve the foregoing objects, and such other objects as may hereinafter appear or be pointed out, in the manner illustratively exemplified in the accompanying drawing, wherein- Figure 1 is a plan view of the forward portion of a typical urethral catheter;

Figure 2 is a view of a stylet constructed in accordance with the present invention;

Figure 3 is a view similar to Figure 2, illustrating a modification;

Figure 4 is a view similar to Figure 2, illustrating a further modification;

Figure 5 is an enlarged cross-sectional view taken substantially along the line 55 of Figure 3;

Figure 6 is an enlarged cross-sectional view taken substantially along the line 66 of Figure 4;

Figure 7 is an enlarged fragmentary cross-sectional view showing the possible employment of a stiffening wire; and

Figure 8 is a perspective view of the catheter of Figure 1 rigidified by means of the stylet of Figure 2.

The catheter I0 is of well known character, being approximately fifteen inches in length and being composed of soft rubber approximately onesixteenth of an inch thick. The external diameter of the catheter I0 is about one-fourth of an inch. At its forward end, the rubber merges into a gradual rounded tip I I, and I have illustratively shown two eyes or openings I2 disposed behind the tip and on opposite surfaces. It will be understood that, in some catheters, one of these openings is disposed along an oblique plane practically intersecting the tip of the catheter.

he catheter of Figure 1 has practically no rigidity at all, and its insertion into the urethra is accomplished with the aid of a stylet of the present character. One form is illustrated in Figure 2. The body of the stylet is composed of a long strip of spring metal, such as stainless steel, helically wound to form a body it. This body has an external diameter of about threethirty-seconds of an inch, and the strip of which the helix is formed is less than one-thirty-second of an inch wide and less than one-sixty-fourth inch in thickness.

My invention is obviously not restricted to any specific dimensions, and the foregoing figures are stated merely for the purpose of explaining the general nature of the present construction.

At its opposite ends, the helix is plugged by a rounded tip M which is shown most clearly in Figure 5. It consists of a solid body of metal or the like, having a rearward attenuated stem l5, which projects into the end of the helix and is maintained in this position by solder or by any other similar means. The external diameter of each tip H5 is substantially equal to the external diameter of the body of the stylet.

In Figure 2, the end portion of the stylet has been permanently set into a predetermined gentle curvature it which has a radius of approximately three-eighths inch. This particular curvature is shown merely by way of example, and the stylet illustrated in Figure 3 has its end portion set into the more gradual curvature H which r may, for example, have a radius of approximately two inches. The degree of curvature is optional, and stylets constructed in accordance with the present invention may have any predetermined gentle curvature imparted to the end portion, depending upon requirements. This permanent set may be produced in accordance with any recognized method of tempering spring metal, and it will be understood that the word permament, as used in this connection in the present specification and claims, is intended to signify merely that the normal disposition of the stylet lies along the curvature imparted thereto. This curved portion of the stylet nevertheless embodies the same yieldability and resilience as the uncurved portion thereof. For example, any of the stylets illustrated will straighten out quite readily and exert merely a mild constant tendency to return, when released, to the curvature into which they have been permanently set.

In Figure 4, I have illustrated on a somewhat smaller scale a modified construction in which the mid-portion it of the stylet is composed of a truly rigid, rod-like element, preferably tubular in character, as shown most clearly in Figure 6. A flexible, resilient portion i9 is mounted at one end of the element it in alignment therewith and consists of a helically wound strip of spring metal, as hereinbefore described. A similar flexible, resilient portion 26 is mounted at the opposite end of the element l8. At the free end of each of the helical portions a plug 14 is mounted in the manner most clearly shown in Figure 5.

Each of the helixes may be secured to the rodlike portion H3 in any desired manner, preferably by providing attenuated portions 2! on the element I8 over which the helix ends are disposed, and secured in position by means of solder or the like. It will be observed that the external diameter of the portion i8 is thus substantially equal to the external diameter of the helically wound portions.

The advantage of the construction of Figure 4 lies in the fact that the expense of Winding the helix for the full length of the stylet is saved, the midportion not requiring the degree of yieldability which the end portions should have in order for the stylet to be safely used. In the embodiment of Figure 4, I have shown the portion I9 permanently set into a gentle curvature similar to that of Figure 3, and I have shown the opposite end portion substantially straight. Any suitable curvatures may be provided, and they are preferably different in degree, so that the operator using the device of Figure 4 may have at his immediate disposal a stylet which is virtually equivalent to two different stylets of different curvatures, depending upon which end he inserts into the catheter.

In any of the embodiments herein illustrated, it may be desirable to insert an additional stiffening wire of the character illustrated at 22 in Figure '7. This wire is of flexible, resilient material; it extends longitudinally through the helix; and its ends are preferably secured to the rounded plugs at the ends of the helix. To accomplish this, it is preferable to construct each of the plugs 23 (see Figure '7) with a longitudinal bore 24 into which the end of the stiffening wire 22 projects. It is held in this position by means of solder or the like.

Where the helix has been given a predetermined curvature, the stififening wire 22 is given a similar and corresponding curvature. Where the stylet is constructed with a rigid portion, as

in Figures 4 and 6, the wire 22 extends preferably through the rigid portion, and it is for this reason that this rigid portion is preferably tubular in nature.

Any selected stylet may be employed with any selected catheter, and in Figure 8 I have illustrated, by way of example, the manner in which the stylet of Figure 2 serves to reinforce the catheter of Figure l to permit its insertion into the urethra. It will be observed that the catheter tip does not conform completely to the natural curvature of the portion I6. This is of no moment, because, presumably, the curvature imparted to the tip of the catheter by the stylet of Figure 2 is the degree of bending which the operator desires to have. degree of angularity, he would employ a stylet having a more gradual curvature.

The reinforced catheter embodies just the proper degree of rigidity which is necessary to facilitate its insertion. It is not too stiff or rigid, as is frequently the case with ordinary stylets, nor is it too yielding to permit proper manipulation. Of primary importance is the safe character of the present stylet. Should its tip by accident project from one of the eyes of the catheter, no injury is likely to occur, firstly, because the tip is blunted, and, secondly, because the stylet embodies a yieldability which causes it to give immediately when pressed against an obstruction. This readiness to yield and to bend at isolated points is inherent in the helical structure and is one of the characterizing features of the present stylet. The stylet as a whole, at the same time, embodies the requisite amount of rigidity for the primary purpose of facilitating insertion of the catheter.

In general, it will be understood that changes in the details, herein described and illustrated for the purpose of explaining the nature of my in- Should he desire a lesser vention, may be made by those skilled in the art without departing from the spirit and scope of the invention as expressed in the appended claims. It is, therefore, intended that these details be interpreted as illustrative, and not in a. limiting sense.

Having thus described my invention, and illustrated its use, what I claim as new and desire to secure by Letters Patent is-- 1. A catheter stylet comprising a rigid, tubular portion, a pair of flexible, resilient portions mounted at opposite ends thereof in alignment therewith, each of said flexible portions comprising a helically wound strip of spring metal, a rounded tip plugging the free end of each helix, and a flexible, resilient, stifiening wire extending longitudinally through said rigid and flexible portions and having its ends secured to said tips.

2. A catheter stylet comprising a rigid, tubular portion, a pair of flexible, resilient portions mounted at opposite ends thereof in alignment therewith, each of said flexible portions comprising a helically wound strip of spring metal, a rounded tip plugging the free end of each helix, the end portion of one of said helixes being permanently set into a predetermined gentle curvature, and a flexible, resilient, stiffening wire extending longitudinally through said rigid and flexible portions, said wire having a permanent set conforming to said curvature and having its ends secured to said tips.

FREDERICK CHARLES WAPPLER.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2463149 *24 Nov 19471 Mar 1949Caine Curtis WEndotracheal intubating stylet
US2685289 *3 Nov 19523 Aug 1954Devine Jr John WSurgical apparatus for intestinal intubation
US3119392 *14 Feb 196128 Jan 1964Zeiss AliceCatheter
US3128769 *23 Jul 196214 Apr 1964Abbott LabCatheter assembly
US3336927 *6 Apr 196422 Aug 1967Sklar Mfg Co JSurgical instrument for bile duct explorations
US3452742 *29 Jun 19661 Jul 1969Us Catheter & Instr CorpControlled vascular curvable spring guide
US3521620 *30 Oct 196728 Jul 1970Cook William AVascular coil spring guide with bendable tip
US3580255 *8 Apr 196825 May 1971Cimber Hugo SAspirator
US3612058 *17 Apr 196812 Oct 1971Electro Catheter CorpCatheter stylets
US3638649 *7 Jul 19691 Feb 1972Univ MinnesotaImplantable prosthetic pass-through device
US3729008 *28 Dec 197024 Apr 1973American Optical CorpElectrode for atrial pacing with curved end for atrial wall engagement
US3731671 *21 Oct 19718 May 1973Cordis CorpLow-friction catheter guide
US3867945 *14 May 197325 Feb 1975Wendell M LongCatheter stylets
US3973556 *20 Jun 197510 Aug 1976Lake Region Manufacturing Company, Inc.Smoothened coil spring wire guide
US4004588 *25 Aug 197525 Jan 1977Wrightson Nma LimitedApparatus for flushing ova from cows or mares
US4080706 *4 Nov 197628 Mar 1978Medrad, Inc.Method of manufacturing catheter guidewire
US4195624 *9 Jun 19781 Apr 1980Douglas Donald DTubular sheath for facilitating the insertion of an endoscope
US4307723 *8 Feb 198029 Dec 1981Medical Engineering CorporationExternally grooved ureteral stent
US4405314 *19 Apr 198220 Sep 1983Cook IncorporatedApparatus and method for catheterization permitting use of a smaller gage needle
US4474174 *23 Feb 19832 Oct 1984American Hospital Supply CorporationSurgical instrument for an endoscope
US4509945 *17 Dec 19829 Apr 1985Sterimed Gesellschaft Fur Medizinischen Bedarf MbhCatheter for catheterizing central veins
US4552554 *25 Jun 198412 Nov 1985Medi-Tech IncorporatedIntroducing catheter
US4571239 *13 Nov 198418 Feb 1986Heyman Arnold MCatheter-stylet assembly for slipover urethral instruments
US4577637 *13 Jul 198425 Mar 1986Argon Medical Corp.Flexible metal radiopaque indicator and plugs for catheters
US4649916 *11 Jul 198417 Mar 1987Med-Inventio AgStiffening probe and tensioning device therefor
US4659328 *12 Mar 198421 Apr 1987Biosearch Medical Products, Inc.Stylet
US4692152 *15 Mar 19858 Sep 1987Fresnius AgMedical tube
US4756708 *2 Jun 198712 Jul 1988Vas-Cath IncorporatedBiopsy catheter
US4790331 *2 Dec 198613 Dec 1988Sherwood Medical CompanyMethod for placement of catheter in a blood vessel
US4790810 *4 Nov 198513 Dec 1988American Medical Systems, Inc.Ureteral connector stent
US4791939 *25 Jun 198620 Dec 1988Nivarox-Far S.A.Stylet for use with an implantable pacing lead
US4800890 *26 Dec 198531 Jan 1989Cramer Bernhard MSteerable guide wire for catheters
US4817630 *2 Nov 19874 Apr 1989Schintgen Jean MarieControl cable for a biopsy forceps
US4830023 *27 Nov 198716 May 1989Medi-Tech, IncorporatedMedical guidewire
US4863430 *26 Aug 19875 Sep 1989Surgical Dynamics, Inc.Introduction set with flexible trocar with curved cannula
US4867173 *30 Jun 198619 Sep 1989Meadox Surgimed A/SSteerable guidewire
US4932419 *21 Mar 198812 Jun 1990Boston Scientific CorporationMulti-filar, cross-wound coil for medical devices
US4934380 *23 Nov 198819 Jun 1990Boston Scientific CorporationMedical guidewire
US4991602 *27 Jun 198912 Feb 1991Flexmedics CorporationFlexible guide wire with safety tip
US5003657 *8 Jul 19882 Apr 1991MediproDevice for unblocking intubation tubes and tracheotomy cannulas in vivo
US5061245 *19 Jan 199029 Oct 1991Waldvogel Chester WArterial bypass tool
US5065769 *18 Jan 199119 Nov 1991Boston Scientific CorporationSmall diameter guidewires of multi-filar, cross-wound coils
US5106377 *30 Jan 199021 Apr 1992Vas-Cath IncorporationChorion biopsy catheter
US5111829 *18 Jan 199112 May 1992Boston Scientific CorporationSteerable highly elongated guidewire
US5160325 *22 Jan 19913 Nov 1992C. R. Bard, Inc.Catheter with novel lumens shapes
US5285795 *12 Sep 199115 Feb 1994Surgical Dynamics, Inc.Percutaneous discectomy system having a bendable discectomy probe and a steerable cannula
US5312357 *3 Nov 199217 May 1994Drager Medical Electonic B.V.Catheter
US5366490 *22 Dec 199322 Nov 1994Vidamed, Inc.Medical probe device and method
US5370675 *2 Feb 19936 Dec 1994Vidamed, Inc.Medical probe device and method
US5385544 *14 May 199331 Jan 1995Vidamed, Inc.BPH ablation method and apparatus
US5396902 *28 May 199314 Mar 1995Medtronic, Inc.Steerable stylet and manipulative handle assembly
US5409453 *19 Aug 199325 Apr 1995Vidamed, Inc.Steerable medical probe with stylets
US5421819 *13 May 19936 Jun 1995Vidamed, Inc.Medical probe device
US5435805 *13 May 199325 Jul 1995Vidamed, Inc.Medical probe device with optical viewing capability
US5450842 *19 Feb 199319 Sep 1995United States Surgical CorporationEndoscopic surgical retractor
US5456662 *9 May 199410 Oct 1995Edwards; Stuart D.Method for reducing snoring by RF ablation of the uvula
US5470308 *19 Nov 199328 Nov 1995Vidamed, Inc.Medical probe with biopsy stylet
US5470309 *12 Jan 199428 Nov 1995Vidamed, Inc.Medical ablation apparatus utilizing a heated stylet
US5514131 *23 Sep 19947 May 1996David L. DouglassMethod for the ablation treatment of the uvula
US5531677 *11 Apr 19952 Jul 1996Vidamed, Inc.Steerable medical probe with stylets
US5542915 *12 Jan 19946 Aug 1996Vidamed, Inc.Thermal mapping catheter with ultrasound probe
US5554110 *12 Jan 199410 Sep 1996Vidamed, Inc.Medical ablation apparatus
US5556377 *22 Dec 199317 Sep 1996Vidamed, Inc.Medical probe apparatus with laser and/or microwave monolithic integrated circuit probe
US5562619 *19 Oct 19938 Oct 1996Boston Scientific CorporationDeflectable catheter
US5599294 *7 Oct 19944 Feb 1997Vidamed, Inc.Microwave probe device and method
US5599295 *8 Nov 19954 Feb 1997Vidamed, Inc.Medical probe apparatus with enhanced RF, resistance heating, and microwave ablation capabilities
US5607389 *27 Nov 19954 Mar 1997Vidamed, Inc.Medical probe with biopsy stylet
US5630794 *23 Sep 199420 May 1997Vidamed, Inc.Catheter tip and method of manufacturing
US5662119 *21 Apr 19952 Sep 1997Medtronic Inc.Steerable stylet and manipulative handle assembly
US5672153 *26 Sep 199430 Sep 1997Vidamed, Inc.Medical probe device and method
US5720718 *6 Jan 199424 Feb 1998Vidamed, Inc.Medical probe apparatus with enhanced RF, resistance heating, and microwave ablation capabilities
US5720719 *26 Sep 199424 Feb 1998Vidamed, Inc.Ablative catheter with conformable body
US5848986 *21 Jun 199615 Dec 1998Vidamed, Inc.Medical probe with electrode guide for transurethral ablation
US5865800 *8 Oct 19962 Feb 1999Boston Scientific CorporationDeflectable catheter
US5873842 *26 Jun 199723 Feb 1999Medtronic, Inc.Steerable stylet and manipulative handle assembly
US5895370 *7 Jan 199720 Apr 1999Vidamed, Inc.Medical probe (with stylets) device
US6022334 *17 Apr 19988 Feb 2000Vidamed, Inc.Medical probe device with optic viewing capability
US6102886 *27 May 199815 Aug 2000Vidamed, Inc.Steerable medical probe with stylets
US6106489 *4 Apr 199722 Aug 2000Mallinckrodt Inc.Cable particularly for tracheostomy and retrograde-intubation techniques
US620684717 Mar 199927 Mar 2001Vidamed, Inc.Medical probe device
US646466127 Mar 200115 Oct 2002Vidamed, Inc.Medical probe with stylets
US6676643 *23 Mar 200113 Jan 2004Nicor, Inc.Anesthesia conduction catheter
US668911025 Nov 200210 Feb 2004Micor, Inc.Anesthesia conduction catheter
US675579425 Apr 200129 Jun 2004Synovis Life Technologies, Inc.Adjustable stylet
US677676521 Aug 200117 Aug 2004Synovis Life Technologies, Inc.Steerable stylet
US720173120 Apr 200010 Apr 2007Lundquist Ingemar HTreatment device with guidable needle
US746217729 Aug 20039 Dec 2008Micor, Inc.Anesthesia conduction catheter
US771321531 Jan 200811 May 2010Shriver Edgar LSteering, piercing, anchoring, distending extravascular guidewire
US78921869 Dec 200522 Feb 2011Heraeus Materials S.A.Handle and articulator system and method
US7896888 *9 Jan 20081 Mar 2011Cook IncorporatedMultiple wire guide introducer system
US802949525 Mar 20104 Oct 2011Pyles Stephen TIntrathecal catheter having a stylet with a curved tip and method of use
US848602331 Aug 201116 Jul 2013Stephen T. PylesIntrathecal catheter having a stylet with a curved tip
US20110202036 *10 Sep 201018 Aug 2011Taris Biomedical, Inc.Systems and Methods for Deploying Devices to Genitourinary Sites
DE3334174A1 *21 Sep 198322 Mar 1984Bard Inc C RLenkbarer fuehrungsdraht fuer die ballondilatation
DE3502322A1 *24 Jan 198514 Nov 1985Biosearch Medical ProdMandrin
EP0082504A1 *17 Dec 198229 Jun 1983Sterimed Gesellschaft für medizinischen Bedarf mbHCatheter for the catheterisation of central veins
EP0092389A1 *14 Apr 198326 Oct 1983Cook IncorporatedApparatus for catheterization permitting use of a smaller gage needle
EP0132387A2 *19 Jul 198430 Jan 1985Cook IncorporatedCatheter wire guide with movable mandril
EP0207438A1 *25 Jun 19867 Jan 1987Nivarox-FAR S.A.Stylet for an implantable electrode
EP0347035A2 *27 Apr 198920 Dec 1989C.R. Bard, Inc.Guidewire extension with selflatching detachable connection
EP0709109A2 *21 Sep 19901 May 1996Cardiometrics, Inc.Joint construction for a medical guide wire
WO1983002064A1 *17 Dec 198223 Jun 1983Sterimed GmbhCatheter for central veins
WO1997037710A1 *4 Apr 199716 Oct 1997Mallinckrodt Medical IncCable particularly for tracheostomy and retrograde-intubation techniques
Classifications
U.S. Classification604/170.2, 15/104.33
International ClassificationA61M25/09
Cooperative ClassificationA61M25/09033
European ClassificationA61M25/09B2