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Publication numberUS3618613 A
Publication typeGrant
Publication dateNov 9, 1971
Filing dateMay 19, 1969
Priority dateMay 19, 1969
Publication numberUS 3618613 A, US 3618613A, US-A-3618613, US3618613 A, US3618613A
InventorsRudolf R Schulte
Original AssigneeHeyer Schulte Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Antithrombotic intravascular catheter reinforced with nonkinking means
US 3618613 A
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Description  (OCR text may contain errors)

United States Patent 72] Inventor [211 App]. No.

[22] Filed 45 Patented [73 Assignee [54] ANTITHROMBOTIC CATHETER REINFO MEANS Rudolf R. Schulte Santa Barbara, Calif. 825,656

May 19, 1969 Nov. 9, 1971 Heyer-Schulte Corporation Santa Barbara, Calif.

1 Claim, 4 Drawing Figs.

[52] U.S.C1 [51] lnt.Cl

[50] Field of Search References Cited UNITED STATES PATENTS 2,330,399 9/1943 Winder INTRAVASCULAR RCED WITH NONKINKING 3,416,531 12/1968 Edwards 128/348 3,434,869 3/1969 Davidson 128/349 3,453,194 7/1969 Bennett et a1 3/1 3,485,234 12/1969 Stevens 128/348 X FOREIGN PATENTS 1,048,288 8/1953 France 128/351 4,816 1889 Great Britain 128/349 Primary Examiner-Dalton L. Truluck Attorney-Angus & Mon

ABSTRACT: This invention relates to tubular catheters which are inserted through veins to enter the peritoneal cavity for medical purposes. Such tubing catheters have other medical applications such as for drainage or for introduction of medical materials, but since the tubing is of such a small diameter.

PATENTEB NOV 9 |97| IN VI'JN'H m. Rl/DOLF R. SCHUL TE BY L a M ATTORNEYS.

ANTITI-IROMBOTIC INTRAVASCULAR CATHETER REINFORCED WITH NONKINKING MEANS DESCRIPTION OF THE INVENTION This invention relates to surgical catheters.

An object of this invention is to provide a catheter for body implant, of small diameter, which will stand the stress of insertion through the veins or organs of a body.

Another object of the invention is to provide the tube-type catheter which can resist the stresses of insertion with kinking.

A further object of the invention is to provide tubing catheter which will not fail at the point where the tubing is applied to connecting devices.

Still another object of the invention is to provide tubing which will be self-guided into a vein and prevent kinking failure at its point of entrance. 1

Still another object of the invention is to provide a catheter which will curve over the muscles encountered during its course through the body without kinking.

A further object of the invention is to provide reinforced tubing that will be capable of penetrating muscles before entering body cavities without kinking or other mechanical failure. 7

Other objects and advantages of the instant invention will be shown by studying the figures and the description of invention, which follows:

FIG. 1 is a segment of an embodiment of the invention partially in cross section;

FIG. 2 is a side elevation of the embodiment of FIG. 1 before final coating; I

FIG. 3 is a section on line 33 of FIG. 2; and

FIG. 4 shows the embodiment of the invention of FIG. I and FIG. 2 in process of final coating.

In FIG. 1 there is shown a preferred embodiment of the invention.

The tubing is encircled by a continuous wire coil spring 11 which encircles the tubing in very close contact, preferably an interference fit, between the inside diameter of the the coil spring 11 and the outside diameter of the tubing 10. The tubing 10 for this class of article is of very small internal and external diameter, in the range of one-sixteenth inch. In order to provide the interference fit, the tubing is made with an entrance probe, as seen in FIG. 2. The entrance probe 12 may be conveniently formed on the tubing by thermoplastic means or may be a separate piece assembled to the tubing 10.

In order to make a coil spring of diameter that will be in interference fit with the tubing 10, the spring may be conveniently wound on a mandrel of larger diameter to form the coil and then elongated to provide the spacing of the coils and further to reduce the internal diameter of the coil spring 11.

A convenient length of tubing 10 with entrance probe 12 at one end is gripped by the entrance probe 12 and pulled through the coil 1 l with sufiicient force to overcome the interference fit between coil 11 and the outside diameter of tubing 10.

The tubing 10 is then suspended in air hanging from a fixture which engages entrance probe 12. A container 13 having a spout 14, the spout having an entrance hole 15, is passed over the tubing to the uppermost end so that entrance hole I5 is in a downward direction and the entrance hole 15 is so designed that it is a close fit to the outside diameter of the coil spring 11. The container 13 is then filled with a silicone material 16 which may conveniently be a silicone rubber of air-curing formulation. Silicone rubber is formulated to a viscosity which will cause it to cling to the exterior of the tubing 10 and fill the recesses between the coils of the spring 11 and fonn a coating 17 over said spring 11 and tubing 10 of the desired thickness. As the container 13 is allowed to move slowly downward over the tubing 10 and coil spring 11 assembly, the coated assembly of tubing 10 and coil spring I1 is then allowed to hang in air until the silicone material hardens to its final consistency,

One novel production method in assuring that the small diameter tubing may be pulled through in interference fit through the smaller internal diameter coil spring II is accomplished by fusing a cord or wire to the end of the tubing 10, so that the outside diameter does not have to be increased by adding a gripping means for pulling through the coil spring 11.

The distal end of the tubing, which is formed by the entrance probe 12 is coated with an antithrombotic coating, which may be of the nature of Hepacone, to prevent the formation of blood clots as the tubing is pulled through the body.

Thus it can be seen that a reinforced, small diameter tubing, which will not be subject to kinking and will not be reactive to the body fluids and is further provided with an entrance probe to permit passage through the body and a coating to prevent formation of thrombosis is provided by the instant invention, in accordance with the following claims.

I claim:

1. A surgical catheter comprising a flexible tubing made entirely of silicone rubber; an entrance probe integral with the flexible tubing and also made of silicone rubber, said entrance probe having a stepped-down outer diameter less than the outer diameter of the tubing and extending as a cylinder for a substantial distance; an antithrombotic coating of silicone rubber infused with heparin on said entrance probe; a flexible coil spring encircling and in interference fit with said tubing; and a surface coating of silicone rubber, once liquid and later cured to a solid, said coating fully covering the exposed surface of the spring and tubing and substantially filling in the interstices between convolutions of the spring.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Dated November 9, 1971 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

In the Patent Col. 1, lines 9-12 line 13 line 14 lines 17-18 lines 27-28 line 30 lines 31-32 line 33 line 35 line 36 line 38 lines 42-43 line 43 "stand the stress. .with kinking" should be --withstand insertion and usage stresses without kinking-- "tubing" should be -a tubular-- "will not fail" should be --resist failure-- "self guided into a vein and prevent kinking failure" should be --self guiding as it enters into a vein and will resist kinking-- "shown by...which follows:" should be --evident from the following detailed description in the accompany drawings in which:--

II II a should be -the presently-- "The" should be --A-- Cancel "internal and external" after "inch' and before the period, insert -inner diameter-- J Page -2- UNITED STATES PATENT OFFICE Patent No.

November 9, 1971 Dated Inventor(s) RUDOLF R. SCHULTE It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

In the Patent (continued) 7 Col. 1, line Col.

line

line

line

line

line

lines 18-20 line line

ll l3 "made" should be --provide- "seen" should be -shown-- "conveniently" should be --integrally-- Cancel "by thermoplastic means" "be"should be --constitute-- Cancel "conveniently" after "pulled" insert --by it-- "is" should be --makes-- "to" should be --with-- "which may conveniently be" should be --such as-- "Silicone" should be --The silicone-- "As the container. tubing 10 and coil spring ll" should be --The container is moved slowly dovmward over the assembled tubing and coil spring, which causes this assembly to be coatec with a layer of silicone. After this coating occurs, the coated article-- "assuring that" should be --enabling-- "may" should be --to-- J Page -3 3,618,613 November 9, 1971 Patent No. Dated RUDOLF R. SCHULTE Inventor(s) It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

in the Patent (continued) 1 Col. 2, lines 24-25 in interference fit through" to --and fit tightly in-- lines 25-26 "accomplished fusing. .tubing 10," to --by attaching a cord or wire to the probe,

line 27 after "diameter" insert --of the tubing-- line 28 after 'll." insert --The cord or wire is passed freely through the spring, and is then used to pull the fusing through the spring.--

line 31 "which may be of the nature of Hepacone' should be --such as a coating including heparin-- line 37 change the comma to a period and cancel "in accordance with the following claims."

line 38 Add the following paragraph: --This invention is not to be limited by the embodiment shown in the drawings and described in the description, which is given by way of example and not of limitation, but only in accordance with the scope of the appended claims.--

Signed and sealed this 9th day of January 1973.

(SEAL) rttest: .1

EDWARD M. FLETCHER ,JR ROBERT GOTTSCHALK lttesting Officer Commissioner of Patents

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2330399 *Sep 11, 1937Sep 28, 1943American Anode IncDistensible bag catheter
US3416531 *Jan 2, 1964Dec 17, 1968Edwards Miles LowellCatheter
US3434869 *Nov 2, 1964Mar 25, 1969Dow CorningFoley catheter with silicone rubber coating
US3453194 *Aug 3, 1966Jul 1, 1969Dow CorningAnticoagulant surfaces produced by radiation grafting heparin to a silicone substrate
US3485234 *Apr 13, 1966Dec 23, 1969Cordis CorpTubular products and method of making same
FR1048288A * Title not available
GB188904816A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3757768 *Apr 7, 1972Sep 11, 1973Medical Evaluation Devices AndManipulable spring guide-catheter and tube for intravenous feeding
US3937224 *Apr 11, 1974Feb 10, 1976Uecker Ronald LColostomy catheter
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US4106506 *Jan 26, 1976Aug 15, 1978Koehn Wilbur RCatheter
US4360031 *Sep 11, 1980Nov 23, 1982Medtronic, Inc.Drug dispensing irrigatable electrode
US4547192 *Apr 11, 1983Oct 15, 1985Superior Plastic Products Corp.Gastroenteric feeding tube
US4634432 *May 13, 1985Jan 6, 1987Nuri KocakFor catherters
US4669456 *May 4, 1983Jun 2, 1987Mentor CorporationPositionable penile prosthesis
US4832681 *Dec 2, 1987May 23, 1989Lenck Lucien CMethod and apparatus for artificial fertilization
US4931039 *Oct 21, 1988Jun 5, 1990Baxter International Inc.Ventricular catheter introducer
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Classifications
U.S. Classification604/523
International ClassificationB29C41/36, B05D1/18, A61M25/00
Cooperative ClassificationA61M25/005, B29L2031/7542, B29C41/36, B29L2023/00, A61M25/0045, B05D1/18, A61M25/0012
European ClassificationB29C41/36, B05D1/18, A61M25/00S2
Legal Events
DateCodeEventDescription
Jan 30, 1990ASAssignment
Owner name: BAXTER INTERNATIONAL INC.
Free format text: CHANGE OF NAME;ASSIGNOR:BAXTER TRAVENOL LABORATORIES, INC., A CORP. OF DE;REEL/FRAME:005050/0870
Effective date: 19880518
Mar 2, 1987ASAssignment
Owner name: BAXTER TRAVENOL LABORATORIES, INC. A CORP. OF DE
Free format text: MERGER;ASSIGNOR:AMERICAN HOSPITAL SUPPLY CORPORATION INTO;REEL/FRAME:004760/0345
Effective date: 19870126
Apr 16, 1984ASAssignment
Owner name: AMERICAN HEYER-SCHULTE CORPORATION
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HEYER-SCHULTE CORPORATION;REEL/FRAME:004245/0660
Effective date: 19800623
Feb 22, 1983ASAssignment
Owner name: AMERICAN HOSPITAL SUPPLY CORPORATION; ONE AMERICAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AMERICAN HEYER- SCHULTE CORPORATION;REEL/FRAME:004099/0695
Effective date: 19830121