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Publication numberUS3731671 A
Publication typeGrant
Publication dateMay 8, 1973
Filing dateOct 21, 1971
Priority dateOct 21, 1971
Publication numberUS 3731671 A, US 3731671A, US-A-3731671, US3731671 A, US3731671A
InventorsMageoh N
Original AssigneeCordis Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Low-friction catheter guide
US 3731671 A
Abstract
A low-friction catheter guide for facilitating the insertion of catheters into the vascular system of human beings or animals, especially where insertion through relatively long lengths of blood vessels is involved. Friction is minimized by forming a catheter guide over which the lumen of the enclosing catheter passes and contact between the two is reduced to a series of point contacts. The guide is formed in such a fashion that a series of radial extensions or protuberances constitute the contact areas. A preferred method of forming the guide is by winding a wire upon a non-circular mandrel and permitting the coil to unwind slightly after it is removed from the mandrel. The unwinding or springback results in adjacent convolutions of the coil being rotated slightly with respect to each other.
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Description  (OCR text may contain errors)

I United States Patent 1 [111 3,731,671

Mageoh 1 May 8, 1973 54 LOW-FRICTION CATHETER GUIDE 3,528,406 9 1970 Jeckel ..128 2.o5 R

75 I t N l H. M h 3301 N.E. 5th 1 nven or e son ageo Primary Examiner--Aldrich F. Medbery Avenue, Fla.

Attorney-George W. Crowley [73] Assignee: Cordis Corporation, Miami, Fla. 221 Filed: on. 21, 1971 [57] ABSTRACT [211 App- No': 191,186 low-friction catheter guide for facilitating the insertron of catheters mto the vascular system of human beings or animals, especially where insertion through [52] US Cl 1 8/1 128/2 /349 R relatively long lengths of blood vessels is involved. /0 A61b Friction is minimized by forming a catheter guide over A61!) which the lumen of the enclosing catheter passes and [58] Field of Search ..l28/2.05 R, 127, ontact between the two is reduced to a series of point 349 2 M contacts. The guide is formed in such a fashion that a series of radial extensions or protuberances constitute [56] Referenc s Cit d the contact areas. A preferred method of forming the guide is by winding a wire upon a non-circular man- UNITED STATES PATENTS drel and permitting the coil to unwind slightly after it 2,118,631 5/1938 Wappler ..l28/349 R s r m d fr m th mandrel. The unwinding or 3,060,972 10/1962 Sheldon springback results in adjacent convolutions of the coil 3,452,742 7/1969 Muller being rotated slightly with respect to each other. 3,485,237 12/1969 Bedford.... 3,521,620 7/1970 Cook ..128/2.05 R 7 Claims, 4 Drawing Figures LOW-FRICTION CATHETER GUIDE BACKGROUND OF THE INVENTION Catheterization of human beings or animals has become relatively common in certain diagnostic techniques such as angiography. These techniques involve the insertion of a catheter into the vascular system and it was early learned that ease of insertion and greater control of direction is possible if a flexible guide is first inserted. The catheter itself may then be passed over the guide. However, friction between the .lumen of the catheter and the guide is unavoidable and the greater the length of insertion, the greater the friction becomes. Several obvious steps have been taken to reduce the friction such as coating the guide with plastic materials. A commonly used friction-reducing material is the well-known fluorocarbon Teflon.

Further to; reduce friction and to provide greater flexibility and control, it has been the practice to employ a fine wire wound in a tightly coiled helix rather than a simple relatively large solid wire as the guide. Obviously, such a helix not only is more flexible than a solid wire but also has less areal contact with the lumen of the enclosing catheter.

Helical catheter guides are formed in a conventional manner, generally by winding a wire upon a circular mandrel or by utilizing a coil-forming machine which forms a helical coil without need of a mandrel. Conventionally, a guide generally also includes a central axial wire and a smooth end tip to which both the wire and coil are connected.

GENERAL DESCRIPTION OF THE INVENTION The present invention has as its major object further reduction of the friction between a catheter lumen and the flexible guide over which it is designed to pass. That object is preferably obtained by utilizing a non-circular mandrel. If, for example, a flattened or oval mandrel is utilized, a flattened or oval coil can be wound. When the mandrel is removed from such a coil, springback occurs and the coil unwinds to some degree. The resulting guide coil becomes one in which adjacent turns of the coil are rotationally displaced relative to each other. Stated otherwise, the major axis of the ellipse formed by each turn of the coil is rotated slightly from that of its adjacent turn. Thus, when a catheter is passed over the guide, contact between the lumen of the catheter and the guide itself occurs only at a series of relatively widely spaced points. Friction between the guide and the lumen is radically decreased as the catheter is moved with respect to the guide.

For a better understanding of the present invention, together with other and further features thereof, reference should be made to the following detailed description of a preferred embodiment of the invention as shown in the drawing in which:

FIG. 1 is an elevation, partly in section, and partly cut away showing a guide in the process of being wound upon a non-circular mandrel.

FIG. 2 is a cross-section of the guide and mandrel shown in FIG. 1.

FIG. 3 is an elevation, partly in section, illustrating the passage of a catheter over a guide from which the mandrel has been withdrawn, and

FIG. 4 is a cross-section taken along the lines 4-4 of FIG. 3.

DESCRIPTION OF THE PREFERRED EMBODIMENT As noted above, achievement of the purposes of the invention is facilitated by utilizinga non-circular mandrel upon which a wire is tightly wound. In FIG. 1, a mandrel 12 in the form of a flattened or oval wire is illustrated. Tightly wound upon the mandrel 12 is a coil 14 composed preferably of stainless steel wire of much smaller diameter than that of the mandrel. Relative sizes and shapes may be better appreciated and understood by reference to FIG. 2.

In the fabrication. of a practical guide, of course, many feet of wire 14 are wound upon the mandrel 12 after which the mandrel is withdrawn from the formed coil, the coil itself being several feet or more in length. In the winding process, a slight amount of tension is imparted to the wire 14 and, upon withdrawal of the mandrel, springback occurs. This springback causes a slight unwinding of the coil to take place and adjacent turns or convolutions of the coil rotate slightly with respect to each other. With the type of oval or elliptical mandrel here under consideration, the coil which results is one in which the major axis of the ellipse formed by each convolution is rotated slightly from its neighboring turn.

In FIGS. 3 and 4, the coil of wire 14 may be seen in plan and section in relation to a catheter 16. Rather than the continuous peripheral contact that would exist between a conventional helical coil and the lumen of the catheter, contact is reduced to a series of points and these points are relatively widely spaced from one another along the length of the catheter as well as around its internal surface.

Although the preferred construction of the catheter guide is as described and shown, other embodiments of the invention are also feasable, the basic concept being the reduction of contact between lumen and guide to a series of points. Also, mandrels of cross-section other than oval may also be used, of course. For example, a triangular mandrel might well be used and, again, contact between catheter wall and guide would be considerably reduced as compared to that where a straight helix is utilized. Basically, a guide of non-circular crosssection is contemplated and the presently preferred embodiment involves the use of an oval guide in which adjacent turns are rotated relative to each other.

Iclaim 1. A low-friction catheter guide comprising a length of wire formed into a coil of non-circular cross-section the successive convolutions of which are axially disoriented from its adjacent convolution.

2. A low-friction catheter guide as defined in claim 1 wherein said coil is formed of a plurality of turns, each of said turns being of similar non-circular configuration, and being progressively axially rotationally displaced relative to its adjacent turns.

3. A low-friction catheter guide as defined in claim 1 wherein said coil comprises turns of wire of generally oval cross-section.

4. A low-friction catheter guide as defined in claim 3 wherein adjacent ones of said turns of oval cross-section are rotationally displaced relative to each other.

5. In combination with a catheter having a lumen, a catheter guide over which said catheter may be passed, said guide being formed with a successive series of longitudinally spaced radially offset protuberances, said 3 ,73 l ,67 l 3 4 lumen being in contact only with said spaced protube- 7. In a combination as defined in claim 6, a catheter rances.

6. ln a combination as defined in claim 5, a catheter guide comprising a length of wire formed into a coil of non-circular cross-section, said protuberances com- 5 prising the radial extremities of said coil.

guide in which each turn of said coil has a generally oval cross-section, adjacent turns being rotationally displaced from one another.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2118631 *Apr 3, 1935May 24, 1938Charles Wappler FrederickCatheter stylet
US3060972 *Aug 22, 1957Oct 30, 1962Bausch & LombFlexible tube structures
US3452742 *Jun 29, 1966Jul 1, 1969Us Catheter & Instr CorpControlled vascular curvable spring guide
US3485237 *Mar 20, 1967Dec 23, 1969Rca CorpSelf-propelling hose
US3521620 *Oct 30, 1967Jul 28, 1970Cook William AVascular coil spring guide with bendable tip
US3528406 *Oct 29, 1965Sep 15, 1970Us Catheter & Instr CorpFlexible spring guide tip for insertion of vascular catheters
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4003369 *Apr 22, 1975Jan 18, 1977Medrad, Inc.Angiographic guidewire with safety core wire
US4080706 *Nov 4, 1976Mar 28, 1978Medrad, Inc.Method of manufacturing catheter guidewire
US4323071 *May 19, 1980Apr 6, 1982Advanced Catheter Systems, Inc.Vascular guiding catheter assembly and vascular dilating catheter assembly and a combination thereof and methods of making the same
US4362163 *Mar 28, 1979Dec 7, 1982Eduard Fresenius Chem.-Pharm. Industrie Kg Apparatebau KgStiffening core for catheters
US4474174 *Feb 23, 1983Oct 2, 1984American Hospital Supply CorporationTo cut tissue
US4548206 *Jul 21, 1983Oct 22, 1985Cook, IncorporatedCatheter wire guide with movable mandril
US4577643 *May 10, 1984Mar 25, 1986Cordis CorporationMovable multi-contact electromechanical connection
US4886500 *Nov 7, 1988Dec 12, 1989Lazarus Harrison MExternal guide wire
US4922924 *Apr 27, 1989May 8, 1990C. R. Bard, Inc.Catheter guidewire with varying radiopacity
US4984581 *Oct 12, 1988Jan 15, 1991Flexmedics CorporationFlexible guide having two-way shape memory alloy
US5003918 *Dec 28, 1989Apr 2, 1991Interventional Technologies, Inc.Apparatus for manufacturing atherectomy torque tubes
US5019089 *Dec 7, 1989May 28, 1991Interventional Technologies Inc.Atherectomy advancing probe and method of use
US5062648 *Mar 21, 1990Nov 5, 1991Interventional Technologies, Inc.Seal for rotating torque tube with seal valve
US5209735 *Aug 27, 1991May 11, 1993Lazarus Harrison MExternal guide wire and enlargement means
US5295493 *Nov 10, 1992Mar 22, 1994Interventional Technologies, Inc.Anatomical guide wire
US5365944 *Apr 19, 1994Nov 22, 1994C. R. Bard, Inc.Guidewire extension with self-latching detachable connector
US5404887 *Nov 4, 1993Apr 11, 1995Scimed Life Systems, Inc.Guide wire having an unsmooth exterior surface
US5647846 *May 17, 1995Jul 15, 1997Scimed Life Systems, Inc.Catheter having geometrically shaped surface and method of manufacture
US5792116 *May 13, 1997Aug 11, 1998Scimed Life Systems, Inc.Catheter having geometrically shaped surface and method of manufacture
US6106485 *Nov 18, 1997Aug 22, 2000Advanced Cardivascular Systems, Inc.Guidewire with shaped intermediate portion
US6296616Mar 3, 2000Oct 2, 2001Advanced Cardiovascular Systems, Inc.Guidewire with shaped intermediate portion
US6669886Aug 3, 2000Dec 30, 2003Scimed Life Systems, Inc.Reinforced catheter and method of manufacture
US6673025Nov 16, 1999Jan 6, 2004Advanced Cardiovascular Systems, Inc.Polymer coated guidewire
US7455646Jun 26, 2007Nov 25, 2008Advanced Cardiovascular Systems, Inc.Polymer coated guide wire
US7494474Jul 31, 2003Feb 24, 2009Advanced Cardiovascular Systems, Inc.Polymer coated guidewire
US7841994 *Nov 2, 2007Nov 30, 2010Boston Scientific Scimed, Inc.Medical device for crossing an occlusion in a vessel
US7846171May 27, 2004Dec 7, 2010C.R. Bard, Inc.Method and apparatus for delivering a prosthetic fabric into a patient
US8221440Nov 8, 2010Jul 17, 2012C.R. Bard, Inc.Method and apparatus for delivering a prosthetic fabric into a patient
US8377035Jan 17, 2003Feb 19, 2013Boston Scientific Scimed, Inc.Unbalanced reinforcement members for medical device
US20090030277 *Mar 31, 2006Jan 29, 2009Ryuhei FujimotoEndoscope Insertion Portion and Endoscope System
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WO2009004876A1 *May 30, 2008Jan 8, 2009Piolax Medical Devices IncGuide wire
Classifications
U.S. Classification600/585, 604/95.1
International ClassificationA61M25/09, A61M23/00, A61B17/00, A61B5/02
Cooperative ClassificationA61M25/09, A61M2025/09075
European ClassificationA61M25/09