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Publication numberUS3698394 A
Publication typeGrant
Publication date17 Oct 1972
Filing date14 Jun 1971
Priority date14 Jun 1971
Publication numberUS 3698394 A, US 3698394A, US-A-3698394, US3698394 A, US3698394A
InventorsPiper William S, Polak Teodor
Original AssigneePolak Teodor, Piper William S
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electrically heated hypodermic needle
US 3698394 A
Abstract
A surgical instrument is provided in the form of a hypodermic needle, the tip of the needle being heated by passing an electric current through a resistance wire within the needle adjacent its tip. The needle has particular utility for medical purposes, and is used, for example, to destroy blood vessels or tissue.
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Description  (OCR text may contain errors)

154] ELECTRICALLY HEATED HYPODERMIC NEEDLE [72] Inventors: William S. Piper, 555 Greencraig Road; Teodor Polak, 443 Greencraig Road, both of Los Angeles,

Calif. 90049 221 Filed: June 14, 1971 [21] Appl. No.: 152,549

[ Oct. 17, 1972 1,355,932 10/1920 Walter ..l28/303.l 1,913,595 6/1933 Hyman et a1. ..l28/303.l8 2,516,882 8/1950 Kalom ..l28/303.l8 X 3,301,258 1/1967 Werner et a1 l 28/303.l

Primary Examiner-Channing L. Pace [5 7] ABSTRACT A surgical instrument is provided in the form of a hypodermic needle, the tip of the needle being heated s2 U.S.Cl .Q ..128/303.1, 128/404 by Passing an electric current through a resistance [51 lnt.C1. ..A6lb 17/36, A6ln 3/06 wire Within the needle adjacent its The needle has 581 Field of Search ..128/303.l, 303.18, 404 particular utility for medical p p and is used, r

example, to destroy blood vessels or tissue. [56] References Cited 7 Claims, 3 Drawing Figures UNITED STATES PATENTS .w .7 r

1,234,570 7/1917 Rink ..128/303.1 ux

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ELECTRICALLY HEATED HYPODERMIC NEEDLE BACKGROUND OF THE INVENTION A medical need often arises for the destruction of small veins, and this is achieved simply and effectively by the surgical instrument of the invention. In the practice of the invention, a needle is inserted percutaneously into a vein, and electric current is passed through the needle at a rate sufficient to heat its tip. This results in immediate destruction of the vein and subsequent disappearance thereof.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a perspective view, on an enlarged scale, of a surgical instrument in the form of a hypodermic needle constructed in accordance with the invention;

FIG. 2 is a side section taken along line 2-2 of FIG. 1; and

FIG. 3 is a side section, like FIG. 2, of a modified embodiment of the invention.

DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENT The surgical instrument illustrated in the FIGS. 1 and 2 of the drawing includes a usual hollow hypodermic needle which may, for example, be a No. 27 needle having a 16 mil outer diameter and a 9 mil inner diameter, the needle being composed, for example, of surgical steel. A wire 12 of low resistance and high electrical conductivity is positioned coaxially within the hypodermic needle 10, the conductor 12 being insulated from the needle by any appropriate electrical insulation designated 14.

The conductor 12 may be composed, for example, of copper wire of 4 mil diameter. The copper wire 12 terminates at a point displaced from the tip of the needle 10. A high resistance wire 16 is positioned within the needle in axial alignment with the conductor 12, the high resistance wire 16 extending from the end of the conductor 12 to a point adjacent the tip of the needle. The high resistance wire 16 may have a diameter, for example, of 3.5 mils, and it may be composed of a nickel chrome alloy.

An appropriate end fitting may be provided at the right hand end of the needle in FIGS. 1 and 2. This fitting may have any appropriate known configuration. The fitting is not shown since it does not have any significance to the present invention.

The resistance element 16 is bonded to the end of the conductor 12 by a silver braze, for example, or by other suitable means serving as an electrical and mechanical connection between the high resistance wire and the conductor 12. The other end of the high resistance wire 16 is bonded to the tip of the needle by, for example, similar means. The electrical and mechanical connection between the high resistance wire 16 and the conductor 12 designated 18, and the electrical and mechanical connection between the other end of the resistance element 16 and the tip of the needle 10 is designated 20.

The insulation 14, as shown, extends around the high resistance wire 16, as well as around the conductor 12, so that both are insulated from the needle 10, except for the connection between the end of the high resistance wire 16 and the needle 10, as designated 20.

The right-hand end of the conductor 12 and of the needle 10 may be connected to an appropriate source of electric power, either direct current or alternating current, and designated 22. Then, when electric power is applied from the source 22, the resulting electric current flows through the conductor 12 and through resistance element 16, and back to the needle 10, causing the resistance element 16 to become heated, thereby o heating the tip of the needle l0.

In the practice of the invention, the hypodermic needle is inserted percutaneously into the vein of the patient, and the tip is internally heated by passing the aforesaid alternating or direct current through the high resistance wire 16 inside the needle. All or part of the needle can be heated depending on the length and place of the wire 16. The power source 22 may be controllable, so as to control the temperature of the heated portion of the needle.

Alternatively, the needle can be constructed as shown in FIG. 3 in which a high resistance wire core 14a extends the length of the needle. The high resistance wire core is coated (by means of electroplating or otherwise) with a low resistance metal 12a, such as copper or silver, except for the portion of the needle where heat is desired. The high resistance wire core 14a can be manufactured with a continuous coating which can be selectively removed prior to assembly in the needle by chemically dissolving it or by abrasion.

As mentioned above, the surgical instrument of the invention has particular utility whenever it is desired to destroy small blood vessels, veins and tissue.

It will also be appreciated that although a particular embodiment of the invention has been shown and described, modifications may be made, and it is intended in the following claims to cover all modifications which come within the scope of the invention.

What is claimed is:

l. A surgical instrument comprising: a hollow hypodermic needle having a pointed tip and composed of electrically conductive material; an elongated electrical conductor extending in coaxial relationship within said needle;'electrically insulating means interposed between said conductor and said needle for insulating said conductor from said needle; an electrical resistance element mounted within said needle; and means electrically connecting said resistance element to said needle and to said conductor, so that electric current passed through said needle and through said conductor passes through said electrical resistance element to heat a portion of said needle.

2. The surgical instrument defined in claim 1, in which said resistance element is in the form of a wire positioned in axial alignment with said conductor adjacent the tip of said needle.

3. The surgical instrument defined in claim 1, in which said needle is composed of surgical steel.

4. The surgical instrument defined in claim 1, in which said elongated electrical conductor comprises a copper wire.

5. The surgical instrument defined in claim 1, in which said electrical resistance element has an elongated configuration and is disposed within said needle in axial alignment with said conductor.

6. The surgical instrument defined in claim- 1, in which said resistance metal is composed of a nickel chrome alloy.

7. The surgical instrument defined in claim 1, in

which said elongated electrical conductor comprises a high resistance wire coated with a low resistance metal except for that portion of the needle where heat is desired. 5

Patent Citations
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US1355932 *5 Jul 191919 Oct 1920Allen J WalterCombined sound and heating element
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US2516882 *22 Jan 19481 Aug 1950Lawrence KalomElectrical probe
US3301258 *3 Oct 196331 Jan 1967Medtronic IncMethod and apparatus for treating varicose veins
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3875944 *4 Feb 19748 Apr 1975Philip M ToyamaHeated acupuncture needle and method of using the same
US3886944 *19 Nov 19733 Jun 1975Jamshidi KhosrowMicrocautery device
US4142529 *20 Jun 19776 Mar 1979Bio-Tronics, Inc.Process and device for the therapeutic treatment of hemorrhoids
US4227535 *2 Apr 197914 Oct 1980Bio-Tronics, Inc.Proctologic device for the therapeutic treatment of hemorrhoids
US4269174 *6 Aug 197926 May 1981Medical Dynamics, Inc.Transcutaneous vasectomy apparatus and method
US4411266 *24 Sep 198025 Oct 1983Cosman Eric RThermocouple radio frequency lesion electrode
US4527560 *27 Oct 19829 Jul 1985Masreliez Carl JMedical or dental probe with self-heating tip and methods for making
US4672962 *7 Oct 198516 Jun 1987Cordis CorporationPlaque softening method
US4682596 *22 May 198428 Jul 1987Cordis CorporationElectrosurgical catheter and method for vascular applications
US4748979 *13 Apr 19877 Jun 1988Cordis CorporationTo be inserted into the lumen of a blood vessel
US4947842 *13 Feb 198914 Aug 1990Medical Engineering And Development Institute, Inc.Method and apparatus for treating tissue with first and second modalities
US4955883 *29 Aug 198811 Sep 1990DiversatronicsGlaucoma needle with a thermal heat band
US4961422 *2 May 19889 Oct 1990Marchosky J AlexanderMethod and apparatus for volumetric interstitial conductive hyperthermia
US4992045 *28 Oct 198812 Feb 1991Dentsply Research & Development Corp.Battery powered condenser for root canals
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US5170788 *24 Apr 199115 Dec 1992Vickers PlcNeedle electrode and method of assembly thereof
US5197466 *7 Jan 199230 Mar 1993Med Institute Inc.Method and apparatus for volumetric interstitial conductive hyperthermia
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US628393530 Sep 19984 Sep 2001Hearten MedicalUltrasonic device for providing reversible tissue damage to heart muscle
US631242630 May 19976 Nov 2001Sherwood Services AgMethod and system for performing plate type radiofrequency ablation
US67197708 Jun 200113 Apr 2004Tony R. BrownUltrasonic device for providing reversible tissue damage to heart muscle
US73511998 Aug 20031 Apr 2008Smiths Group PlcCatheters
US7384391 *3 Dec 200410 Jun 2008William A. Cook Australia Pty. Ltd.Heated ovum pick up needle
US798970327 Feb 20092 Aug 2011Fort Wayne Metals Research Products CorporationAlternating core composite wire
US86004946 Sep 20113 Dec 2013Ionix Medical Inc.Method and device for treating abnormal tissue growth with electrical therapy
US860309715 Jan 201310 Dec 2013Insight Surgical Instruments, LlcMinimally invasive surgical applicator
US88017235 Nov 201312 Aug 2014Insight Surgical Instruments, LlcMinimally invasive surgical applicator
USRE33925 *8 Dec 198812 May 1992Cordis CorporationElectrosurgical catheter aned method for vascular applications
EP0102538A1 *5 Aug 198314 Mar 1984Sterimed Gesellschaft für medizinischen Bedarf mbHDevice for puncture and catheterisation for human or animal bodies
EP1393690A2 *5 Aug 20033 Mar 2004Smiths Group plcCatheters
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WO2012151253A1 *2 May 20128 Nov 2012Insight Surgical Instruments LlcMinimally invasive surgical applicator
Classifications
U.S. Classification606/29, 219/229, 219/233
International ClassificationA61B18/08, A61B18/04
Cooperative ClassificationA61B18/082
European ClassificationA61B18/08B