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 numberUS3867945 A
Publication typeGrant
Publication dateFeb 25, 1975
Filing dateMay 14, 1973
Priority dateMay 14, 1973
Publication numberUS 3867945 A, US 3867945A, US-A-3867945, US3867945 A, US3867945A
InventorsWendell M Long
Original AssigneeWendell M Long
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Catheter stylets
US 3867945 A
Abstract
The present invention relates to a new adjunct to the insertion of a urethral catheter. It is a catheter stiffener and former made of a plastic rod which has the properties of being a flexible, resilient member capable of properly stiffening a urethral catheter or the like while also being sufficiently compliant to pre-shaping into various and multiple curvatures to facilitate insertion into a body cavity.
Images(1)
Previous page
Next page
Description  (OCR text may contain errors)

United States Patent 1 1 1111 3,867,945 Long Feb. 25, 1975 CATHETER STYLETS 011 1 12335384251} Inventor: Wendell M. g 528 NW. ,5 /1 o erty 3 8 Oklahoma City Okla Primary ExaminerDalton L. Truluck Attorney, Agent, or Firm-Laney, Dougherty, Hessin [22] Filed: May-l4, 1973 & Fish [21] Appl. No.: 359,984

[57] ABSTRACT The present invention relates to-a new adjunct to the gz i g g g insertion of a urethral catheter. it is a catheter stiff- [58] Fieid ener and former made of a plastic rod which has the properties of being a flexible, resilient member capa- [5611 References Cited ble of properly stiffening a urethral catheter or the like while-also being-sufficiently compliant to pre- UNITED STATES PATENTS v shaping into various and multiple curvatures t0 facili 2,l Wappler R {ate insertion into a bod cavit I 2,458,305 1/1949 Sanders 128/348 y 2,463,149 3/1949 Caine... 128/351 8 Clalms, 6 Drawing Figures PATENTED FEB25 5975 l I I. I. I. I. I ,i. I. I. I. I. ll

Ill. ill I. Isl I. h I Ill III III! ibi CATHETER STYLETS BACKGROUND OF THE INVENTION use with the Foley urethral catheter.

2. Description of the Prior Art The prior art includes various types of catheter stylets, not only for use in Foley-type urethral catheters but other catheters as designed for insertion in particular body cavities, i.e. endotrachea catheters, trocar catheters, etc. Generally, the prior forms of stylets have been formed from wire or other rigid metallic materials. The prior art devices, especially as employed for insertion of urethral catheters, had inherent shortcomings due to the very fact of their necessary rigidity. The use of the conventional wire stylets required manipulation and insertion by a trained urologist in performance of the routine as well as the more difficult catheterizations, as the wire guide could very easily force the catheter to pierce the delicate wall of the urethra when not properly avoiding obstructions.

SUMMARY OF THE INVENTION The present invention contemplates a readily expendable catheter stiffener formed of desirably resilient material and it is particularly adapted for use with the Foley urethral catheter. The stiffener and former consists of an elongated portion having the proximal end formed with a pre-selected curvature and a distal portion with an enlarged diameter formed for co-action with the distal end of the Foley catheter. The proximal end of the stylet is formed with a curvature of optimum radius for encounter with the particular obstructions and curvatures present'along the urethral tract.

Therefore, it is an object of the present invention to provide a catheter stylet that is semi-rigid and sufficiently stiff to guide the catheter during insertion and to prevent collapsing of the catheter tube.

It is still another object of the invention to provide a stiffener and former which may be pre-formed into a variety of curves as selected to implement insertion of the catheter device.

It is yet another object of the present invention to provide a catheter stylet having greater resiliency and which is unlikely to damage. the fragile lumen of the urethra when the catheter is inserted.

It is also an object of the present invention to provide a stiffener of simple design having no moving parts which is inexpensive to manufacture and may be disposable after a single usage.

It is therefore an object to provide a stiffener and former compatible with the design of the Foley urethral catheter which may be factory inserted for sale with the Foley catheter as a unit, thereby reducing extra handling and contamination prior to its usage.

Finally, it is an object of the present invention to provide a stiffener and former for use with the Foley catheter which will enable the more routine catheterization to be carried out by nurses or physicians assistants without danger of damage to the urethral tract of the patient.

Other objects and advantages of the invention will be evident from the following detailed description when read in conjunction with the accompanying drawing which illustrates the invention.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a top plan view of the stiffener and former as constructed in accordance with the present invention;

FIG. 2-is a side elevation of the: stiffener of FIG. 1;

FIG. 3 is a side elevation of an alternative form of stiffener;

FIG. 4 is a vertical section ofa Foley urethal catheter as is well-known in the prior art;

FIG. 5 is a vertical section of the Foley catheter with stiffener inserted; and

FIG. 6 is a section taken along lines 6-6 of FIG. 5.,

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings in greater detail, FIGS. 1 and 2 show a catheter stiffener and former 10 as constructed in accordance with the present invention. The stiffener and former 10 is comprised of a rod 12 as securely joined or affixed to what may be termed a handle 14. A proximal end portion 16 is then preformed with a curvature 18 of selected radius, generally not too severe but of sufficient curvature to allow optimum probing manipulation during catheter insertion. A proximal tip 20 of rod 12 is rounded off to prevent damage to the proximal end portions of the catheter and/or the urethral wall.

Rod 12 is preferably formed from selected plastic materials having the requisite properties as to resil-' therein to ,be secured through interference fit. While the rod 12 and handle 14 are shown as being formed in two separate pieces, it should be understood that the stiffener and former 10 can be formed unitarily in one piece through conventional plastic molding practices.

While the stiffener and former 10 is shown in FIG. 2 as having a curvature 18, that which is known as the single curved or coude tip, some practitioners prefer, and the exigencies of certain therapeutic applications may demand, a double curved tip 24 such as is shown in FIG. 3. The curve 24 also subtends a relatively gentle curvature through formation of two distinct angular bends 26 and 28.

FIG. 4 represents a standard form of Foley urethral catheter as is now well-known in the art. The Foley catheter is the particular subject matter of US. Pat. Nos. 2,428,407 and 3,l52,592 and the teachings embodied therein have enjoyed wide application and success. Conventionally, insertion of the Foley catheter has required either the use of a wire-form stylet with its attendant piercing and injury problems, or the attending physician has had to apply excessive lubrication and short stroke insertions of very time-consuming and un- Certain nature.

Briefly, the Foley catheter 30 consists of a distal portion 32 and tube portion 34, the tube portion 34 being formed to include a drainage lumen 36 and an inflation or control lumen 38. The Foley catheters may be formed as bi-Iuminal or tri-Iuminal tubes, at least one of which, such as tube 38, is in communication with a balloon 40 which is sealingly connected about tube portion 30 proximate the proximal end 42 of catheter 30. Dash-lines 44 illustrate in section the balloon 40 after it has been inflated to the attitude wherein it prevents withdrawal of tube portion 34 from the bladder. The drainage conduit 36, of larger diameter, is in communication with the fluid drainage holes 46 as formed near the proximal tip 42 of catheter 30. At the distal end, catheter 30 is formed with a control tube 48 in communication with control lumen 38 and serving to provide inflation and de-inflation control. A closure element 50 within control tube 48 serves to maintain in- I flation pressure within the balloon 44 when in use. A

drainage outlet 52 in communication with drainage lumen 36 provides drainage outlet for urine and collected fluids.

FIGS. 5 and 6 illustrate the catheter 30 with the stiffener and former 10 inserted therein in operational position. Thus, the rod 12 is inserted along the entire length of drainage lumen 36 such that its rounded tip end 20 is fully inserted up to proximal tip 42 of catheter 30. The handle 14 of stiffener and former 10 is inserted within drainage outlet 52 to provide a reasonably tight fit to maintain stiffener and former l securely positioned within catheter 30 during entry manipulation. The length of rod 12 has been established so as to extend through the length of the catheter shaft or drainage lumen 36 such that the handle 14 receives snug fit in the distal end thereof, i.e., drainage outlet 52. In practice, the catheter is actually stretched slightly to cause it to conform to the shape of the former and to thereby further decrease the diameter of the catheter 30 itself. This constraint also serves to prevent buckling or collapsing of the catheter during insertion and manipulation.

OPERATION In practice, the relatively resilient-stiffener and former 10 is inserted into the catheter 30 as shown in FIGS. and 6-. Thereafter, the attending physician, attendant or nurse can then easily manipulate the catheter 30 for probing entry into the urethra of the requiring patient so that the proximal end 42 and drainage holes 46 are entered sufficiently into the urinary bladder. Thereupon,.inflation control is exercised to inflate balloon 40 thereby to retain proximal end 42 within the bladder confines. Then, the attendant needs only to loosen the handle 14 from drainage outlet 52 to easily withdraw the rod 12 of stiffener and former 10. The catheter 30 is then in operational placement and the stiffener and former may be discarded.

In practice it is envisioned that such catheters could be supplied to the physician or hospital with the stiffener and former 10 already inserted therein. After one use only, the stiffener and former would then be discarded. Such capability has the obvious advantages of sterilization assurance, and the minimal cost of stiffener and formers 10 should be quite acceptable for the disposability concept.

Some properties which make a catheter and former combination most desirable are (1 a certain degree of stiffness for ease of insertion; (2) some angulation at the tip to allow the tip to ride over obstructions; (3) highest proportion of luminal to catheter diameter ratio; (4) flexibility and softness of the catheter once inserted so as to not to cause undue stress and pressure on the fragile surface of the urethra; (5) inertness of the catheters material; (6) reduced expense; and (7) the facility of use. Previously used wire guides did not have the optimum compromise of qualities and were quite difficult to use safely and handily since the wireguided catheter could not be relied upon to ride over obstructions but rather to constantly endanger piercing of the urethral wall.

With the present shortage of qualified doctors, more and more catheterizations are done by nurses and physicians assistants, and generally speaking they do not have sufficient training or qualifications to perform difficult catheterizations which require the use of a stylet or, more important, they do not recognize the complications which may result from the use of the conventional style'ts. Thus, the present invention converts the usual Foley catheter into an instrument capable of performing many of the more difficult as well as the row tine catheterizations safely.

In summary, the aims and design of the catheter stiffener and-former permit the use of a soft pliable urethral catheter. with a large drainage lumen as compared to the catheter diameter. The catheter walls can be made thinner to increase the ratio of lumen to catheter size, thus allowing more free drainage of urine from the bladder during operative usage. The stiffener and former will permit easy passage of the catheter through the normal urethral canal or when narrowed, angulated, or otherwise obstructed through disease, such passage being made safely without buckling or collapsing of the drainage channels. The catheter stiffener is designed to be cheap and amenable to mass production as it can be packaged already within the catheter and ready for the insertion procedure.

Changes may be made in the combination, arrangement and size as heretofore set forth in the specification and shown in the drawings; it being understood that changes may be made in the embodiments disclosed without departing from' the spirit and scope of the invention as defined in the following claims.

What is claimed is:

1. An improvement for use in combination with urethral catheters of the type having a drainage lumen and a reduced diameter inflation lumen disposed in parallel through the length thereof, a proximal end for insertion in the urinary bladder, and a distal end including an enlarged diameter drainage outlet communicating with the drainage lumen and an inflation control outlet communicating with said inflation lumen, the improvement consisting of a stiffener and former device comprising:

rod means of uniform cross-sectional configuration and reduced length relative to said drainage lumen and extending from proximal to distal ends and having a diameter which is substantially less than that of said drainage lumen for insertion therein throughout the length thereof, said proximal end being formed with an optimal curvature;

a handle portion secured to the distal end of said rod means, said handle portion being formed with uni- 6 form cross-section slightly larger than said drainage said plastic material is nylon. outlet; 5. The improvement as set forth in claim 3 which is whereby said rod means may be inserted throughout further characterized in that:

the entire length of said drainage lumen with said said rod means and said handle means are unitarily handle means tightly received within the drainage 5 formed as uniform, round elements having preoutlet of said urethral catheter to stiffen the cathedetermined respective diameters. ter while reducing its overall circumference for 6. The improvement as set forth in claim 5 which is urethral insertion. further characterized in that: 2. The improvement as set forth in claim 1 which is said rod means has a diameter of approximately Ill 6 further characterized in that: 10 inch and said handle means has a diameter of apsaid rod means proximal end curvature is formed as proximately three-eights inch. 7

two substantially equal angular bends subtending 7. The improvement as set forth in claim 6 which is an arc defining said optimal curvature. further characterized in that: 3. The improvement as set forth in claim 1 which is said rod means and said handle means are unitarily further characterized in that: formed from nylon.

said rod means and said handle means are formed 8. The improvement as set forth in claim 1 wherein: I from resilient plastic material said urethral catheter is the type known as the Foley 4. The improvement as set forth in claim 3 which is urethral catheter. further characterized in that:

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2118631 *Apr 3, 1935May 24, 1938Charles Wappler FrederickCatheter stylet
US2458305 *Apr 26, 1947Jan 4, 1949Sanders Richard DTubular article comprising rubberlike material
US2463149 *Nov 24, 1947Mar 1, 1949Caine Curtis WEndotracheal intubating stylet
US3397699 *May 5, 1966Aug 20, 1968Gerald C. KohlRetaining catheter having resiliently biased wing flanges
US3460541 *Oct 6, 1966Aug 12, 1969George O DohertyEndotracheal intubation tubes
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4324262 *Jan 2, 1979Apr 13, 1982University Of Virginia Alumni Patents FoundationAspirating culture catheter and method of use
US4581012 *Dec 5, 1984Apr 8, 1986I-Flow CorporationMultilumen catheter set
US4643194 *Jan 15, 1982Feb 17, 1987Thomas J. FogartyFlexible calibrator
US4725264 *Apr 2, 1985Feb 16, 1988Glassman Jacob ADouble barreled biliary balloon catheter
US4747827 *Sep 25, 1986May 31, 1988Micek Frank CNasogastric intubation process
US4790825 *Sep 5, 1986Dec 13, 1988Electro Catheter CorporationClosed chest cannulation method and device for atrial-major artery bypass
US4798193 *May 18, 1987Jan 17, 1989Thomas J. FogartyFor placing an instrument in a body passage
US4834709 *Jan 19, 1988May 30, 1989Sherwood Medical CompanyPreformable catheter
US4894057 *Jun 19, 1987Jan 16, 1990Howes Randolph MFlow enhanced multi-lumen venous catheter device
US4919651 *Jan 9, 1989Apr 24, 1990Santa Barbara Medical Foundation ClinicCatheter having a double lumen and a balloon and method of using the same for controlled operative cholangiography
US4946440 *Oct 5, 1988Aug 7, 1990Hall John EEvertible membrane catheter and method of use
US5047018 *Aug 14, 1989Sep 10, 1991Minnesota Mining And Manufacturing CompanyCatheter and stylet assembly having dual position stylet
US5078684 *Sep 21, 1988Jan 7, 1992Terumo Kabushiki KaishaUreter correcting device
US5111829 *Jan 18, 1991May 12, 1992Boston Scientific CorporationSteerable highly elongated guidewire
US5163912 *Jul 11, 1991Nov 17, 1992Minnesota Mining And Manufacturing CompanyFor venting/draining a chamber of a heart during surgery
US5226427 *Jun 4, 1991Jul 13, 1993Research Medical Inc.Removable stylet for retrograde cardioplegia catheter and methods for use
US5303714 *May 14, 1993Apr 19, 1994Boston Scientific CorporationGuidewire for crossing occlusions in blood vessels
US5342394 *Nov 20, 1992Aug 30, 1994Olympus Optical Co., Ltd.Apparatus for blocking a vein branch and method of blocking a vein branch
US5360406 *Jul 7, 1993Nov 1, 1994Minnesota Mining And Manufacturing CompanyStylet for retrograde coronary sinus cannula
US5376084 *Oct 17, 1991Dec 27, 1994Imagyn Medical, Inc.Catheter with internal mandrel and method
US5382238 *May 20, 1993Jan 17, 1995Quinton Instrument CompanyCatheter stiffeners
US5385152 *May 14, 1993Jan 31, 1995Boston Scientific CorporationGuidewire for crossing occlusions in blood vessels
US5401244 *Apr 28, 1994Mar 28, 1995Minnesota Mining And Manufacturing CompanyMethod of, and stylet apparatus for, installing a retrograde coronary cannula
US5427119 *Nov 3, 1993Jun 27, 1995Daig CorporationGuiding introducer for right atrium
US5489271 *Mar 29, 1994Feb 6, 1996Boston Scientific CorporationConvertible catheter
US5733248 *Nov 29, 1995Mar 31, 1998Scimed Life Systems, Inc.Universal guide catheter
US5755685 *Feb 6, 1996May 26, 1998Boston Scientific CorporationConvertible catheter and the like
US5807326 *Mar 6, 1995Sep 15, 1998Minnesota Mining And Manufacturing CompanyRetrograde coronary sinus catheter
US6200315Dec 18, 1997Mar 13, 2001Medtronic, Inc.Left atrium ablation catheter
US6206870Jan 21, 1999Mar 27, 2001Quest Medical, Inc.Catheter stylet handle
US6241728Sep 14, 1999Jun 5, 2001Medtronic, Inc.Left atrium ablation catheter and method
US6508252Oct 29, 1999Jan 21, 2003St. Jude Medical Atg, Inc.Medical grafting methods and apparatus
US6673025Nov 16, 1999Jan 6, 2004Advanced Cardiovascular Systems, Inc.Polymer coated guidewire
US6699256Jun 2, 2000Mar 2, 2004St. Jude Medical Atg, Inc.Medical grafting apparatus and methods
US6913589Jan 14, 2002Jul 5, 2005Codman & Shurtleff, Inc.Multi-catheter insertion device and method
US6920882Apr 9, 2002Jul 26, 2005St. Jude Medical Atg, Inc.Medical grafting methods and apparatus
US7094220Jun 28, 2002Aug 22, 2006Coloplast A/SCatheter assembly including a catheter applicator
US7118568Mar 31, 2003Oct 10, 2006St. Jude Medical, Atrial Fibrillation Division, Inc.Process and device for the treatment of atrial arrhythmia
US7153301Dec 16, 2002Dec 26, 2006St. Jude Medical, Atrial Fibrillation Division, Inc.Process and device for the treatment of atrial arrhythmia
US7229437Sep 22, 2003Jun 12, 2007St. Jude Medical, Atrial Fibrillation Division, Inc.Medical device having integral traces and formed electrodes
US7234225Sep 22, 2003Jun 26, 2007St. Jude Medical, Atrial Fibrillation Division, Inc.Method for manufacturing medical device having embedded traces and formed electrodes
US7248913Jul 14, 2005Jul 24, 2007St. Jude Medical, Atrial Fibrillation Division, Inc.Guiding introducer system for use in medical procedures in the left ventricle
US7311698Dec 27, 2001Dec 25, 2007Coloplast A/SUrinary catheter assembly allowing for non-contaminated insertion of the catheter into a urinary canal
US7455646Jun 26, 2007Nov 25, 2008Advanced Cardiovascular Systems, Inc.Polymer coated guide wire
US7494474Jul 31, 2003Feb 24, 2009Advanced Cardiovascular Systems, Inc.Polymer coated guidewire
US7517343Jun 28, 2002Apr 14, 2009Coloplast A/SCatheter assembly
US7669309Jun 26, 2007Mar 2, 2010St. Jude Medical, Atrial Fibrillation Division, Inc.Method for manufacturing a medical device having integral traces and formed electrodes
US7682353Nov 28, 2003Mar 23, 2010Coloplast A/SCatheter device
US7682364 *Mar 2, 2006Mar 23, 2010Kyphon SarlMethod for treating a bone
US7699800Mar 16, 2005Apr 20, 2010Codman & Shurtleff, Inc.Multi-catheter insertion device and method
US7771369Dec 5, 2003Aug 10, 2010Boston Scientific Scimed, Inc.Guide catheter with removable support
US7789877Jul 2, 2003Sep 7, 2010St. Jude Medical, Atrial Fibrillation Division, Inc.Ablation catheter electrode arrangement
US7922712Dec 20, 2007Apr 12, 2011Coloplast A/SUrinary catheter assembly allowing for non-contaminated insertion of the catheter into a urinary canal
US8002766Feb 13, 2009Aug 23, 2011Coloplast A/SCatheter assembly
US8007489Jun 25, 2004Aug 30, 2011Volcano CorporationMethod and apparatus for curving a catheter
US8029495Mar 25, 2010Oct 4, 2011Pyles Stephen TIntrathecal catheter having a stylet with a curved tip and method of use
US8052680Oct 10, 2006Nov 8, 2011St. Jude Medical, Atrial Fibrillation Division, Inc.Process and device for the treatment of atrial arrhythmia
US8066693Jun 28, 2002Nov 29, 2011Coloplast A/SCatheter device
US8100859Jun 24, 2008Jan 24, 2012Cook Medical Technologies LlcBent obturator
US8109947Jun 27, 2005Feb 7, 2012St. Jude Medical Atg, Inc.Medical grafting methods and apparatus
US8147486May 23, 2007Apr 3, 2012St. Jude Medical, Atrial Fibrillation Division, Inc.Medical device with flexible printed circuit
US8221408Jun 12, 2007Jul 17, 2012St. Jude Medical, Atrial Fibrillation Division, Inc.Medical device having integral traces and formed electrodes
US8277438Jun 9, 2010Oct 2, 2012Boston Scientific Scimed, Inc.Guide catheter with removable support
US8486023Aug 31, 2011Jul 16, 2013Stephen T. PylesIntrathecal catheter having a stylet with a curved tip
CN100405995CJun 28, 2002Jul 30, 2008科洛普拉斯特公司A catheter device
EP0277369A2 *Dec 30, 1987Aug 10, 1988Advanced Cardiovascular Systems, Inc.Dilatation catheter with angled balloon
EP0411039A1 *Apr 27, 1989Feb 6, 1991Research Medical, Inc.Retrograde venous cardioplegia catheters and methods of use and manufacture
EP0418381A1 *Sep 21, 1988Mar 27, 1991Terumo Kabushiki KaishaUreter redressing device
EP1970090A1Feb 28, 2008Sep 17, 2008Cathrx LtdA formable stylet
EP2666506A1May 22, 2013Nov 27, 2013DePuy Synthes Products, LLCCatheter curvature braces and methods of using same
WO1980001353A1 *Dec 31, 1979Jul 10, 1980J HallAspirating culture catheter and method of use
WO1981002098A1 *Jan 22, 1981Aug 6, 1981Fogarty TFlexible calibrator
WO1993007927A1 *Oct 14, 1992Apr 29, 1993Imagyn Medical IncCatheter with internal mandrel and method
WO1994017743A1 *Feb 11, 1994Aug 18, 1994Harry HodgkinsEmbryo replacement catheter
WO1997010870A1 *Sep 20, 1996Mar 27, 1997Zev GalelComposite guide catheter with shaping element
WO2003002179A2 *Jun 28, 2002Jan 9, 2003Coloplast AsA catheter device
WO2004056414A1Dec 19, 2003Jul 8, 2004Coloplast AsA workable catheter
WO2010036541A1 *Sep 16, 2009Apr 1, 2010Cook IncorporatedCatheter system having variable stiffness
Classifications
U.S. Classification604/170.2, 604/915, 606/108
International ClassificationA61F2/958, A61M25/00
Cooperative ClassificationA61M2025/0063, A61M25/00, A61M25/10, A61M25/0041, A61M25/09025
European ClassificationA61M25/00, A61M25/00R2, A61M25/10, A61M25/09B1