US3530492A - Method and apparatus for administering hypodermic injections - Google Patents

Method and apparatus for administering hypodermic injections Download PDF

Info

Publication number
US3530492A
US3530492A US3530492DA US3530492A US 3530492 A US3530492 A US 3530492A US 3530492D A US3530492D A US 3530492DA US 3530492 A US3530492 A US 3530492A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
member
tubular
end
blunt
sharp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Inventor
Jack R Ferber
Original Assignee
Jack R Ferber
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Images

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/32Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/32Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/329Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles characterised by features of the needle shaft
    • A61M5/3291Shafts with additional lateral openings

Description

Sept. 22, 1970 J FERBER 3,530,492

METHOD AND APPARATUS FOR ADMINISTERING HYPODERMIC INJECTIONS Filed Dec. 5, 1967 INVENTOR JACK RICHARD FERBER ATTORNEYS itecl States 3,530,492 METHOD AND APPARATUS FOR ADMINISTERIN G HYPODERMIC INJECTIONS Jack R. Ferher, 40-18 170th St., Flushing, N.Y. 10058 Filed Dec. 5, 1967, Sen. No. 688,070 Int. Cl. A61m 5/00, 25/00 US. Cl. 128221 7 Claims ABSTRACT OF THE DISCLOSURE BACKGROUND OF THE INVENTION Field of the invention This invention relates to a method for administering a hypodermic injection and to a hypodermic needle for practicing the method. More particularly, the invention relates to a method for administering a hypodermic injection with a blunt-nosed hypodermic needle.

Description of the prior art The common hypodermic needle employed by physicians and dentists is a slender tubular member having a very sharp tip for piercing and penetrating the skin of a patient. It is widely appreciated that the sharp tip of the prior art hypodermic needle cuts through tissue as it penetrates, invariably causing some degree of damage and sometimes causing serious damage by entering blood vessels or puncturing nerves. In fact, even bone damage has been caused by the sharp tip of the hypodermic needle.

High pressure spray devices have been developed to deliver fluid beneath the skin surface without effecting a rupture thereof but these devices are expensive, cumbersome and of no use when the purpose of the injection is to withdraw fluid rather than to deliver it. In addition, spray devices cannot deliver fluid accurately to a particular locus as required in administering a local anesthetic and in treating bursistis by direct injection of cortisone.

Although the disadvantages of hypodermic needles are recognized, no steps have been taken to eliminate or mitigate them. The ideal hypodermic needle should incorporate the advantages of existing needles, namely, low cost which permits disposal after one use, ability to deliver fluid accurately to a specified locus, and simplicity of operation. Additionally, the ideal hypodermic needle should be capable of penetrating the skin without damaging tissue, blood vessels, nerves and bone.

SUMMARY OF THE INVENTION The method for administering a hypodermic injection of the present invention comprises the steps of puncatent O f Patented Sept. 22, 1970 ice turing the skin surface with a member having a sharp point and inserting into the puncture a tubular member having a blunt end and at least one opening in its surface at the blunt end. Finally, the blunt end of the tubular member is passed through the tissue below the skin, substantially beyond the depth of penetration of the member having the sharp point, by forcing it between the tissue fibers without exerting a cutting action.

The apparatus of the invention comprises a first tubular member having a sharp end for piercing the skin surface. A second tubular member is slidably mounted axially inwardly of the first tubular member. The second tubular member has a shank portion, a blunt end for penetrating the skin substantially beyond the depth of penetration of the sharp end of the first tubular member and at least one opening in its surface at the blunt end.

The blunt-nosed needle does not cut through tissue but instead tends to find the natural cleavage planes between tissue fibers and as a result destroys little or no tissue. The blunt end will neither enter blood vessels nor puncture nerves and does not injure bone upon direct impact. Although it is necessary to employ a sharp-tipped member to pierce the skin in order to start the bluntnosed needle, the damage caused thereby is minimal because the depth of penetration of the sharp-tipped member is very small (only skin deep as compared with that of the blunt-nosed needle and therefore the sharp tip never contacts substantial blood vessels, nerves or bones which generally lie well below he skin layer.

An embodiment of the present invention which provides a plurality of openings along the entire length of the needle has ben found to be particularly effective for administering local anesthetics. This feature ensures that all nerves along the path of the needle are anesthetized without having to move the needle tip from one location to another. Furthermore, since the needle discharges anesthetic in all directions it is not necessary that the needle be above the nerve to achieve the desired effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagrammatic view of a hypodermic needle of the present invention illustrating the first tubular member inserted into gum tissue;

FIG. 2 is a diagrammatic view of a hypodermic needle of the present invention illustrating the blunt-nosed tubular member inserted into gum tissue;

FIG. 3 is an enlarged partial sectional view taken substantially along line 33 of FIG. 1;

FIG. 4 is an enlarged view of a first embodiment of the blunt-nosed tubular member of the present invention; and

FIG. 5 is an enlarged view of a second embodiment of the blunt-nosed tubular member of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is an apparatus for administering a hypodermic injection comprising a first tubular member 10 having a sharp end 11 for piercing the skin surface as shown in FIG. 1 and a flange 12 which limits the depth of penetration of the sharp end 11.

A second tubular member 15 is slidably mounted radially inwardly of the first tubular member 10. The second tubular member 15 includes a shank portion 16, a blunt end 17, and a fitting 18 of conventional design which enables the second tubular member 15 to be operatively connected to a conventional hypodermic syringe 19. The second tubular member further includes at least one opening 21 at the blunt end to allow the desired fluid to be injected into or withdrawn from the body of the patient as desired. Additional openings 22 may be provided about the circumferential surface of the blunt end 17 of the second tubular member (FIG. 4) to permit a wider dispersion of the fluid to be injected.

Another embodiment of the present invention (FIG. 5) includes openings 23 which are distributed at random about the blunt end portion 17 and the shank portion 16 of the second tubular member 15. The FIG. 5 embodiment is particularly useful for administering a local anesthetic because the distribution of openings 23 insures that all nerves along the path of the second tubular member 15 will be anesthesized, not just those nerves adjacent the blunt end. The FIG. 5 arrangement thus eliminates the necessity of discharging anesthetic as the second tubular member 15 is traversed beneath the skin. Furthermore, because the random distribution of openings 23 discharges the anesthetic in all directions, even the nerves above the second tubular member 15 will be affected, not just the nerves below as in the case of a conventional hypodermic apparatus having a single opening and depending solely on gravity for distribution.

The outside diameter of the blunt end portion 17 of the second tubular member 15 is slightly greater than the outside diameter of the shank portion 16 and, as shown in FIG. 3, the inside diameter of the first tubular member is dimensioned to engage frictionally the blunt end portion 17 of the second tubular member 15. The frictional force maintains the first tubular member 10 in position overlying the blunt end 17 of the second tubular member and prevents the first tubular member 10 from sliding with respect to the second tubular member 15 when the sharp end 11 of the first tubular member 10 penetrates the skin surface as shown in FIG. 1 and when the blunt end portion 17 of the second tubular member 15 withdraws from beneath the skin. The frictional engagement is overcome when the flange portion 12 of the first tubular member '10 abuts the skin surface, limiting the penetration of the sharp end 11. Thereafter, the second tubular member 15 is free to slide with respect to the first tubular member 10 as the blunt end 17 and the shank portion 16 penetrate substantially beyond the depth of penetration of the sharp end 11 of the first tubular member 10. This feature facilitates the use of the present apparatus and insures that the relatively small first tubular member 10 will not remain imbedded in the skin of the patient after the injection has been administered.

The method of the present invention comprises the steps of puncturing the surface of the skin with a member having a sharp point such as the first tubular member 10 and thereafter inserting a tubular member such as the second tubular member 15 into the puncture. The tubular member must be configured to pass through tissue by finding natural cleavage planes rather than by exert ing a cutting action and must have at least one opening at a forward end to permit passage of fluid therethrough. The tubular member, once inserted in the puncture, is passed into the tissue substantially beyond the depth of penetration of the member having a sharp point.

Although the present apparatus is particularly suited to practice the present method, the benefits and advantages enumerated herein may be achieved in general by following the steps described above.

I claim:

1. Apparatus for administering a hypodermic injection comprising:

(a) a first substantially rigid tubular member having a sharp end for piercing the skin surface and means for limiting the penetration of the sharp end, and

(b) a second substantially rigid tubular member slidably mounted radially inwardly of the first tubular member, the second tubular member having a shank portion, a blunt end portion at the lower end of said shank portion for penetrating tissue substantially beyond the depth of penetration of the sharp end of the first tubular member, said blunt end portion tapering outwardly from said shank portion to a point where the outside diameter thereof is greater than that of said shank portion and then tapering inwardly to a blunt end, and at least one opening in its surface at the blunt end portion.

2. Apparatus according to claim 1 wherein the means for limiting the penetration of the sharp end comprises a flange portion about the exterior of said first tubular member.

3. Apparatus according to claim 2 further including means for maintaining the first tubular member in position overlying the blunt end of the second tubular member and for preventing the first tubular member from sliding with respect to the second tubular member when the sharp end of the first tubular member penetrates the skin surface and when the blunt end of the second tubular member withdraws from beneath the skin.

4. Apparatus for administering a hypodermic injection comprising:

(a) a first tubular member having a sharp end for piercing the skin surface and means forrlimiting the penetration of the sharp end, and

(b) a second tubular member slidably mounted radially inwardly of the first tubular member, the second tubular member having a shank portion, a blunt end for penetrating tissue substantially beyond the depth of penetration of the sharp end of the first tubular member, and at least one opening in its surface at the blunt end, the outside diameter of the blunt end of the second tubular member being greater than the outside diameter of the shank portion of the second tubular member and inside diameter of at least a portion of the first tubular member dimensioned to cause frictional engagement between the first tubular member and the blunt end of the second tubular member.

5. Apparatus according to claim 1 wherein the second tubular member has a plurality of openings in its surface at the blunt end.

'6. Apparatus according to claim 1 wherein the second tubular member has an opening in its surface at the blunt end and a plurality of openings at random locations on its shank portion.

7. A method for administering a hypodermic injection comprising the steps of:

(a) puncturing the surface of the skin to a predetermined depth and a first substatnially rigid tubular member having a sharp point, said first tubular member having slidably mounted radially inwardly therein a second substantially rigid tubular member,

(b) maintaining said first tubular member in place in the skin,

(0) inserting the second substantially rigid tubular member into the puncture through said first tubular member, the second tubular member having a shank portion and a blunt end for penetrating tissue, the outside diameter of the blunt end being greater than the outside diameter of the shank portion and an inside diameter of at least a portion of the first tubular member dimensioned to cause frictional engagement between the first tubular member and the blunt end of the second tubular member and having at least one opening in its surface at the blunt end,

((1) passing the second tubular member into the skin substatnially beyond the depth of penetration of the first tubular member, and

(e) removing the second tubular member from the skin whereby the first tubular member is also thereby removed from the skin.

References Cited UNITED STATES PATENTS 2,711,734- 6/1955 Moe 128276 2,922,420 1/1960 Cheng 128221 3,262,448 7/1966 Ring et a1. 128221 XR 6 3,310,051 3/1967 Schulte 128--350 XR 3,312,220 4/ 1967 Eisenberg 1'28-221 XR 3,415,250 12/ 1968 Peterson 128351 RICHARD A. GAUDET, Primary Examiner K. L. HOWELL, Assistant Examiner US. Cl. X.R. 128-347

US3530492A 1967-12-05 1967-12-05 Method and apparatus for administering hypodermic injections Expired - Lifetime US3530492A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US68807067 true 1967-12-05 1967-12-05

Publications (1)

Publication Number Publication Date
US3530492A true US3530492A (en) 1970-09-22

Family

ID=24762993

Family Applications (1)

Application Number Title Priority Date Filing Date
US3530492A Expired - Lifetime US3530492A (en) 1967-12-05 1967-12-05 Method and apparatus for administering hypodermic injections

Country Status (1)

Country Link
US (1) US3530492A (en)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3840008A (en) * 1972-04-18 1974-10-08 Surgical Corp Safety hypodermic needle
US3949746A (en) * 1974-09-03 1976-04-13 Animal Systems, Inc. Animal injector apparatus
US4276880A (en) * 1978-09-14 1981-07-07 Oscar Malmin Cannula and process
EP0104791A2 (en) * 1982-09-10 1984-04-04 Avvari Rangaswamy Analgesic syringe
US5015228A (en) * 1989-06-05 1991-05-14 Eastman Kodak Company Sterilizing dressing device and method for skin puncture
US5137509A (en) * 1991-04-17 1992-08-11 Dexide, Inc. Surgical insufflation instrument
US5300046A (en) * 1992-03-30 1994-04-05 Symbiosis Corporation Thoracentesis sheath catheter assembly
US5713874A (en) * 1995-08-01 1998-02-03 Kind-R-Ject Company, Llc Camouflaged injection needle
US5743883A (en) * 1995-06-07 1998-04-28 Visconti; Peter L. Thoracentesis catheter instruments having self-sealing valves
US6217556B1 (en) 1998-03-19 2001-04-17 Allegiance Corporation Drainage catheter
US6322536B1 (en) 1998-03-06 2001-11-27 Cornell Research Foundation, Inc. Minimally invasive gene therapy delivery and method
US6508802B1 (en) 2000-05-23 2003-01-21 Cornell Research Foundation, Inc. Remote sensing gene therapy delivery device and method of administering a therapeutic solution to a heart
US6629959B2 (en) 1996-02-27 2003-10-07 Injectimed, Inc. Needle tip guard for percutaneous entry needles
WO2005044116A2 (en) 2003-11-07 2005-05-19 Novo Nordisk A/S Cutting device for blunt needle
US6905489B2 (en) 2001-04-24 2005-06-14 Northgate Technologies, Inc. Laparoscopic insertion device
US7066908B2 (en) 2001-07-25 2006-06-27 Injectimed, Inc. Method and apparatus for indicating or covering a percutaneous puncture site
US20070179450A1 (en) * 2006-01-31 2007-08-02 Earigate Inc. Irrigation device
US7534231B2 (en) 1996-02-27 2009-05-19 Injectimed, Inc. Needle tip guard for percutaneous entry needles
US20100016884A1 (en) * 2006-03-13 2010-01-21 Mini-Lap Techonologies, Inc. Minimally Invasive Surgical Assembly and Methods
US20110022008A1 (en) * 2009-07-09 2011-01-27 Diaz R Gary Wound care system
US20120130415A1 (en) * 2010-11-15 2012-05-24 Vascular Insights Llc Vascular treatment device
WO2015117620A1 (en) * 2014-02-05 2015-08-13 Biontech Ag A cannula, an injection or infusion device and methods of using the cannula or the injection or infusion device
US9326757B2 (en) 2009-12-31 2016-05-03 Teleflex Medical Incorporated Surgical instruments for laparoscopic aspiration and retraction

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2711734A (en) * 1954-02-01 1955-06-28 Oliver M Moe Surgical instrument
US2922420A (en) * 1957-11-29 1960-01-26 Sierra Eng Co Epidural needle
US3262448A (en) * 1963-11-06 1966-07-26 Sorenson Res Corp Intravenous catheter placement unit
US3310051A (en) * 1963-12-10 1967-03-21 Rudolf R Schulte Surgical reservoir for implantation beneath the skin
US3312220A (en) * 1963-04-02 1967-04-04 Eisenberg Myron Michael Disposable indwelling plastic cannula assembly
US3415250A (en) * 1965-08-02 1968-12-10 Roy L. Peterson Emergency tracheotomy kit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2711734A (en) * 1954-02-01 1955-06-28 Oliver M Moe Surgical instrument
US2922420A (en) * 1957-11-29 1960-01-26 Sierra Eng Co Epidural needle
US3312220A (en) * 1963-04-02 1967-04-04 Eisenberg Myron Michael Disposable indwelling plastic cannula assembly
US3262448A (en) * 1963-11-06 1966-07-26 Sorenson Res Corp Intravenous catheter placement unit
US3310051A (en) * 1963-12-10 1967-03-21 Rudolf R Schulte Surgical reservoir for implantation beneath the skin
US3415250A (en) * 1965-08-02 1968-12-10 Roy L. Peterson Emergency tracheotomy kit

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3840008A (en) * 1972-04-18 1974-10-08 Surgical Corp Safety hypodermic needle
US3949746A (en) * 1974-09-03 1976-04-13 Animal Systems, Inc. Animal injector apparatus
US4276880A (en) * 1978-09-14 1981-07-07 Oscar Malmin Cannula and process
EP0104791A2 (en) * 1982-09-10 1984-04-04 Avvari Rangaswamy Analgesic syringe
EP0104791A3 (en) * 1982-09-10 1984-09-12 Avvari Rangaswamy Analgesic syringe
US4512768A (en) * 1982-09-10 1985-04-23 Avvari Rangaswamy Analgesic syringe
US5015228A (en) * 1989-06-05 1991-05-14 Eastman Kodak Company Sterilizing dressing device and method for skin puncture
US5137509A (en) * 1991-04-17 1992-08-11 Dexide, Inc. Surgical insufflation instrument
US5300046A (en) * 1992-03-30 1994-04-05 Symbiosis Corporation Thoracentesis sheath catheter assembly
US5743883A (en) * 1995-06-07 1998-04-28 Visconti; Peter L. Thoracentesis catheter instruments having self-sealing valves
US5713874A (en) * 1995-08-01 1998-02-03 Kind-R-Ject Company, Llc Camouflaged injection needle
EP0841962A1 (en) * 1995-08-01 1998-05-20 Kind-R-Jet Company, L.L.C. Camouflaged injection needle
EP0841962A4 (en) * 1995-08-01 2000-03-29 Kind R Jet Company L L C Camouflaged injection needle
US6629959B2 (en) 1996-02-27 2003-10-07 Injectimed, Inc. Needle tip guard for percutaneous entry needles
US7534231B2 (en) 1996-02-27 2009-05-19 Injectimed, Inc. Needle tip guard for percutaneous entry needles
US6322536B1 (en) 1998-03-06 2001-11-27 Cornell Research Foundation, Inc. Minimally invasive gene therapy delivery and method
US6217556B1 (en) 1998-03-19 2001-04-17 Allegiance Corporation Drainage catheter
US6508802B1 (en) 2000-05-23 2003-01-21 Cornell Research Foundation, Inc. Remote sensing gene therapy delivery device and method of administering a therapeutic solution to a heart
US6905489B2 (en) 2001-04-24 2005-06-14 Northgate Technologies, Inc. Laparoscopic insertion device
US6860871B2 (en) 2001-04-30 2005-03-01 Injectimed, Inc. Needle tip guard for percutaneous entry needles
US20030195479A1 (en) * 2001-04-30 2003-10-16 Kuracina Thomas C. Needle tip guard for percutaneous entry needles
US7066908B2 (en) 2001-07-25 2006-06-27 Injectimed, Inc. Method and apparatus for indicating or covering a percutaneous puncture site
WO2005044116A2 (en) 2003-11-07 2005-05-19 Novo Nordisk A/S Cutting device for blunt needle
US20070179450A1 (en) * 2006-01-31 2007-08-02 Earigate Inc. Irrigation device
US20100016884A1 (en) * 2006-03-13 2010-01-21 Mini-Lap Techonologies, Inc. Minimally Invasive Surgical Assembly and Methods
US9326784B2 (en) 2006-03-13 2016-05-03 Teleflex Medical Incorporated Minimally invasive surgical assembly and methods
US8690841B2 (en) * 2009-07-09 2014-04-08 R. Gary Diaz Wound care system
US20110022008A1 (en) * 2009-07-09 2011-01-27 Diaz R Gary Wound care system
US9326757B2 (en) 2009-12-31 2016-05-03 Teleflex Medical Incorporated Surgical instruments for laparoscopic aspiration and retraction
US20120130415A1 (en) * 2010-11-15 2012-05-24 Vascular Insights Llc Vascular treatment device
US9585667B2 (en) * 2010-11-15 2017-03-07 Vascular Insights Llc Sclerotherapy catheter with lumen having wire rotated by motor and simultaneous withdrawal from vein
US9375216B2 (en) 2010-11-15 2016-06-28 Vascular Insights, Llc Direction reversing vascular treatment device
WO2015117620A1 (en) * 2014-02-05 2015-08-13 Biontech Ag A cannula, an injection or infusion device and methods of using the cannula or the injection or infusion device
US20170007776A1 (en) * 2014-02-05 2017-01-12 Biontech Ag Cannula, an injection or infusion device and methods of using the cannula or the injection or infusion device
JP2017507703A (en) * 2014-02-05 2017-03-23 バイオエヌテック アーゲーBioNTech AG How to use a cannula, injection or infusion device, and a cannula or an injection or infusion device

Similar Documents

Publication Publication Date Title
US3454006A (en) Intravenous catheter-needle assembly provided with needle bushing guide
US3434473A (en) Hypodermic needle unit with integral needle guard
US3608539A (en) Method for the biopsy of subcutaneous masses
US3570485A (en) Flexible catheter and inserting apparatus
US3633579A (en) Catheter placement device and method
US3539034A (en) Paracervical block anesthesia assembly
US3540447A (en) Spinal needle
US3306290A (en) Automatically retractable needle syringe
US3459183A (en) Catheter placement unit with anesthetic
US2630803A (en) Double pneumothoracic needle
US5080654A (en) Fluid injection device for intravenous delivery system
US5713871A (en) Protective sleeve for hypodermic needle
US4803984A (en) Method for performing small vessel anastomosis
US6482176B1 (en) Method and device for controlling the introduction depth of an injection needle
US5084018A (en) Safety syringe
US5312345A (en) Anti-needle stick protective inner blunt tubular stylet for intravenous therapy
US6790197B2 (en) Single use syringe and plunger rod locking device therefor
US4850996A (en) Safety needle
US4961729A (en) Catheter insertion assembly
US5112307A (en) Dental syringe having a medication filled carpule and an automatically-detaching piston stem
US5762639A (en) Device for targeted, catherized delivery of medications
US4002169A (en) Method and apparatus for performing surgery without tissue incision
US4932940A (en) Needle guard device
US5484442A (en) Intraosseous needle
US5370623A (en) Catheter with protective cover and method of catheterization