US3386438A - Tapered needle - Google Patents

Tapered needle Download PDF

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Publication number
US3386438A
US3386438A US47011365A US3386438A US 3386438 A US3386438 A US 3386438A US 47011365 A US47011365 A US 47011365A US 3386438 A US3386438 A US 3386438A
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Prior art keywords
cannula
portion
shank
point
invention
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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
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Peter A Stevens
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Roehr Products Co Inc
Sherwood Medical Co
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Roehr Products Co Inc
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    • 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
    • A61M5/3286Needle tip design, e.g. for improved penetration

Description

United States Patent 3,386,438 TAPERED NEEDLE Peter A. Stevens, Middlebury, Conn., assignor to Roehr Products Company, Inc., a corporation of Delaware Filed July 7, 1965, Ser. No. 470,113 Claims. (Cl. 128-221) ABSTRACT OF THE DISCLOSURE A cannula for cutaneous penetration having a sharp tip for cutting the skin. The shank of the cannula rearwardly of the tip decreases in diameter to provide a minimal friction penetration thereof through the skin by virtue of the enlarged cut made in the skin by the tip which has the maximum cross-sectional area.

Specification This invention relates to cannulae for cutaneous penetration.

The use of cannulae associated with other equipment, such as syringes, to penetrate the skin for administering or withdrawing fluids for medical purposes is well known. Cannulae currently in use have a relatively constant crosssection along substantially their entire length. When such cannulae are inserted through the skin, the edges of the slit caused by the penetration of the point portion resiliently bear against the outer surface of the cannulae. As a result, there is substantial friction between the shank of the cannula and the cutaneous tissue through which the cannula is being inserted. Such friction produces a drag on the cannula as it is being inserted thereby hindering further penetration and causing pain. Various means of lessening such friction to reduce such pain have been employed. Primarily, such means have been limited to the use of various types of lubricants on the shank of the cannula, e.g. silicone lubricants, to reduce such friction. The use of such lubricants, however, introduces the possibility of adverse after effects due to reactions of the tissue to the lubricant. It has been found, for example, that silicones cause the tissues to exude blood for a protracted period of time. One attempt to overcome this serious and vexatious problem has been to provide cannulae having generally planar, enlarged points projecting substantially outwardly of either side of the shanks thereof. Such large, flat tips provide an excessively wide slit during penetration of cutaneous tissue and do not satisfactorily reduce the frictional drag as the skin is still subjected to stretching in a direction transverse to the fiat plane of the tip. Another problem encountered with the known cannulae is the tendency thereof to core, i.e. have a plug of flesh pass into the lumen, or axial passage, of the cannula and plug the passage. The present invention comprehends an improved cannula construction eliminating each of the above discussed discussed disadvantages of the known cannulae in a novel and simple manner.

It is, therefore, the principal object of the present invention to provide a new and improved cannula wherein friction of insertion is eifectively minimized without resorting to the use of lubricants and the like.

More specifically, it is an object of the invention to provide a new and improved cannula that provides easier penetration of the skin and reduced pain by effectively eliminating drag of the tissue by the cannula.

Another object of the invention is the provision of such a cannula wherein the shank portion of the cannula has a transverse dimension in substantially all directions about the axis thereof smaller than the maximum corresponding transverse dimensions of the point portion "ice thereof whereby after initial penetration of the skin -by the point portion, the cannula may pass freely through the resultant slit.

Yet another object of the invention is the provision of such a cannula wherein the shank tapers rearwardly from the point portion thereof.

Still another object of the invention is the provision of such a cannula wherein the shank includes a portion interposed between the tapered portion and the point portion and having a cross-section substantially equal to the maximum cross-section of the point portion.

A still further object of the invention is the provision of such a cannula wherein the 'rearmost portion of the shank includes a cylindrical section.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompaying drawings wherein:

FIGURE 1 is a side elevation of a needle embodying the invention, having a portion thereof broken away;

FIGURE 2 is a side elevation of another form of needle embodying the invention, having a portion thereof broken away;

FIGURE 3 is a side elevation of still another form of needle embodying the invention, having a portion thereof broken away; and

FIGURE 4 is a vertical section of yet another form of needle embodying the invention.

In the exemplary embodiment of the invention as disclosed in FIGURE 1 of the drawing, a cannula generally designated 10 includes a rearwardly enlarging point portion 11 having its maximum dimension transverse to the longitudinal axis of the cannula 10, taken generally at a radial plane indicated at 12. As shown, the point portion 11 defines a sharp leading tip 13 for cutaneous penetration. While the point portion 11 has been shown as the well known flat type of point, those skilled in the artwil appreciate that any other type of point, such as the well known lancet point, could be used in place thereof.

The cannula 10 further includes a shank 1-4 which tapers frusto-conically rearwardly from the point portion 11. As a result thereof, the maximum dimensions of the shank 14 in all radial directions transverse to the longitudinal axis of the cannula 10 rearwardly of plane 12, such as at the radial plane 15, are less than the corresponding maximum transverse dimensions of the point portion 11. Accordingly, when the cannula It} is inserted through the skin tissue, the edges of the slit formed by the point portion 11 will be determined by the maximum transverse dimensions of the point portion 11 at plane 12. As the cannula is further inserted into the tissue, by virtue of the narrowing taper and decreasing periphery of shank portion 14 the tissue will not be subjected to a dragging action, but rather, substantially all portions of the outer surface of shank 14 will recede somewhat inwardly away from the slit edges thereby minimizing friction therebetween. The tissue will not be stretched by virtue of drag by shank 14 and pain, such as heretofore associated with such cannula insertions, is eifectively minimized.

Cannula 1t) defines an axial lumen, or bore, 16. Lumen 16 may have its surface parallel to the outer surface of shank 14 and point portion 11, as shown in FIGURE 1, or, if desired, may be cylindrical as illustrated in the modified needle 20 of FIGURE 2. As shown in FIGURE 1, cannula 10 is provided with a suitable hub 17 for facilitated connection to associated apparatus (not shown) with which it is to be used. Hub 17 includes a central flow passage 18.

Referring now to FIGURE 2, a second exemplary form of a cannula 116 is shown which is generally similar to the cannula 10 shown in FIGURE 1. The structural elements of cannula similar to those of cannula 10 are given similar numerals except one hundred higher. As discussed above, lumen 116, rather than having its surface parallel to the outer surface of shank 114, as is the case with lumen 16 of cannula 10, is cylindrical. The rearmost end 119 of the cannula 111} includes an externally cylindrical portion to facilitate the securing of a suitable hub 117. Cannula 11th functions in substantially the same manner as cannula 10.

A third exemplary form of a cannula 210 embodying the invention is shown in FIGURE 3. The structural elements of cannula 210 similar to those of cannula 10' are given similar numerals except two hundred higher. Cannula 210 differs from cannula It} in that the shank 2145 of cannula 210 includes a short externally cylindrical section 22 0 having a diameter substantially equal to the maximum diameter of point portion 211 (as at plane 212.). Section 220 is disposed between point portion 211 and a rearwardly tapering portion 214. Section 220 of the shank 214- serves to insure that the slit formed in the skin is actually enlarged to substantially the maximum cross section of the point portion, rather than merely stretched to pass the point 211 to thereafter resiliently contract to have frictional engagement with the shank 214 as insertion is continued.

A fourth exemplary form of a cannula 316 embodying the invention is shown in FIGURE 4. The structural elements of cannula 310 similar to those of cannula 10 are given similar numerals except three hundred higher, Cannula 31 0 includes a forward cylindrical section 320 having a diameter substantially equal to the maximum diameter of point portion 311 (as at plane 212). Cannula 318 is also provided with a rear, small diameter, cylindrical section 321 to which hub 317 is secured. Hub 317 includes a central flow passage 318.

The cannulae 10, 110, 21% and 319 may be formed as desired; e.g., they may be formed from suitable blanks comprised of tapered tubes. The blanks may be formed from cylindrical tubes suitably ground to provide the disclosed taper.

Thus, the invention comprehends a new and improved cannula permitting facilitated, friction-free cutaneous penetration without the use of inimical lubricants. As a result, pain is effectively minimized. The gradual decrease of the cross section of the shank over its effective tissue penetration length permits easy movement through the relaxed skin during subsequent withdrawal.

While I have shown and described certain embodiments of my invention, it is to be understood that it is capable of many'rnodifications. Changes, therefore, in the construction and arrangement may be made without depart- 4 7 ing from the spirit and scope of the invention as defined in the appended claims.

I claim:

1. A cannula for cutaneous penetration comprising a tubular element having a shank and a point portion, said point portion comprising a rearwardly enlarging, sharp leading tip for effecting cutaneous cutting, the maximum transverse dimensions of said point portion being greater in substantially all radial directions than the radially corresponding transverse dimensions of said shank over substantially the entire length of the latter with no transverse dimension of the shank being greater than the maximum transverse dimension of the cutting tip, whereby cutaneous friction during subsequent penetration by said shank is effectively minimized.

2. The cannula of claim 1 wherein said shank includes a portion having a periphery of gradually decreasing length extending from said cutting tip.

3. The cannula of claim 1 wherein said shank includes a rearwardly tapering portion extending from said point portion.

4. The cannula of claim 1 wherein said shank tapers substantially constantly rearwardly from said cutting tip along its entire length.

5. The cannula of claim 1 wherein said shank comprises first and second portions, said first portion tapering rearwardly from said cutting tip to said second portion, said second portion being cylindrical.

6. The cannula of claim 3 wherein said rearwardly tapering portion comprises the major portion of said shank, said shank further including a cylindrical portion interposed between said tapering portion and said cutting tip.

7. The cannula of claim 6 wherein said shank includes a second cylindrical portion at the rear end thereof.

8. The cannula of claim 1 wherein said shank is frustoconical.

9. The cannula of claim 1 wherein each of said shank and cutting tip is frusto-conical.

10. The cannula of claim 1 wherein said cutting tip is frusto-conical.

References Cited UNITED STATES PATENTS 2,187,259 1/1940 Barnhart 128-221 3,007,472 11/ 1961 Nitz 12 8-221 3,238,942 3/1966 Lincolf 128339 RICHARD A. GAUDET, Primary Examiner. D. L. BAKER, Assistant Examiner.

US3386438A 1965-07-07 1965-07-07 Tapered needle Expired - Lifetime US3386438A (en)

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4563180A (en) * 1984-06-29 1986-01-07 Raychem Corporation High flow catheter for injecting fluids
US4799484A (en) * 1987-04-10 1989-01-24 Ethicon, Inc. Tapered I-beam surgical needles
US5085648A (en) * 1990-09-13 1992-02-04 Becton Dickinson And Company Dual diameter needle with a smooth transition
WO1993021975A1 (en) * 1992-04-27 1993-11-11 Akzo Nobel N.V. Piercing and sampling probe
US5695479A (en) * 1993-11-01 1997-12-09 Jagpal; Ravindar Instrument, system, kit and method for catheterization procedures
US5718676A (en) * 1994-09-02 1998-02-17 Oversby Pty Ltd. Grooved phaco-emulsification needle
US5935096A (en) * 1994-09-02 1999-08-10 Oversby Pty Ltd. Grooved phaco-emulsification needle
US6132405A (en) * 1995-10-10 2000-10-17 Gambro Ab Catheter for peritoneal dialysis
US6443929B1 (en) 1996-02-27 2002-09-03 Injectimed, Inc. Needle tip guard for hypodermic needles
US6629959B2 (en) 1996-02-27 2003-10-07 Injectimed, Inc. Needle tip guard for percutaneous entry needles
US6773428B2 (en) * 2000-05-12 2004-08-10 Stephen M. Zappala Implantable delivery system and method for the pharmacologic management of erectile dysfunction
US20050222578A1 (en) * 2004-03-31 2005-10-06 Edward Vaquero IOL injector
US20070073271A1 (en) * 2003-11-15 2007-03-29 Brucker Gregory G Catheter for diagnostic imaging and therapeutic procedures
US20080097339A1 (en) * 2006-08-31 2008-04-24 Medrad, Inc. Catheter with filtering and sensing elements
US20080114313A1 (en) * 2006-11-10 2008-05-15 Gomez Mario P Phacoemulsification cannual with improved purchase
US20090292272A1 (en) * 2008-05-21 2009-11-26 Becton, Dickinson And Company Conical diffuser tip
US20100233649A1 (en) * 2009-03-11 2010-09-16 Mcpeek John W Device for sonic irrigation and aspiration of a root canal and method of use thereof
US8273056B2 (en) 2011-02-28 2012-09-25 Injectimed, Inc. Needle guard with resilient spring surrounding tip shield
US8414539B1 (en) 2011-12-27 2013-04-09 B. Braun Melsungen Ag Needle tip guard for percutaneous entry needles
US8672895B2 (en) 2011-02-28 2014-03-18 Injectimed, Inc. Needle guard

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2187259A (en) * 1936-07-11 1940-01-16 George E Barnhart Hypodermic needle
US3007472A (en) * 1957-04-22 1961-11-07 Abbott Lab Hub structure
US3238942A (en) * 1964-10-19 1966-03-08 Harvey A Lincoff Surgical needle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2187259A (en) * 1936-07-11 1940-01-16 George E Barnhart Hypodermic needle
US3007472A (en) * 1957-04-22 1961-11-07 Abbott Lab Hub structure
US3238942A (en) * 1964-10-19 1966-03-08 Harvey A Lincoff Surgical needle

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4563180A (en) * 1984-06-29 1986-01-07 Raychem Corporation High flow catheter for injecting fluids
US4799484A (en) * 1987-04-10 1989-01-24 Ethicon, Inc. Tapered I-beam surgical needles
US5085648A (en) * 1990-09-13 1992-02-04 Becton Dickinson And Company Dual diameter needle with a smooth transition
WO1993021975A1 (en) * 1992-04-27 1993-11-11 Akzo Nobel N.V. Piercing and sampling probe
US5354537A (en) * 1992-04-27 1994-10-11 Akzo N.V. Piercing and sampling probe
US5695479A (en) * 1993-11-01 1997-12-09 Jagpal; Ravindar Instrument, system, kit and method for catheterization procedures
US5718676A (en) * 1994-09-02 1998-02-17 Oversby Pty Ltd. Grooved phaco-emulsification needle
US5935096A (en) * 1994-09-02 1999-08-10 Oversby Pty Ltd. Grooved phaco-emulsification needle
US5989209A (en) * 1994-09-02 1999-11-23 Oversby Pty Ltd. Grooved phaco-emulsification needle
US6132405A (en) * 1995-10-10 2000-10-17 Gambro Ab Catheter for peritoneal dialysis
US6443929B1 (en) 1996-02-27 2002-09-03 Injectimed, Inc. Needle tip guard for hypodermic needles
US6629959B2 (en) 1996-02-27 2003-10-07 Injectimed, Inc. Needle tip guard for percutaneous entry needles
US8444605B2 (en) 1996-02-27 2013-05-21 B. Braun Melsungen Ag Needle tip guard for percutaneous entry needles
US8545454B2 (en) 1996-02-27 2013-10-01 B. Braun Melsungen Ag Needle tip guard for percutaneous entry needles
US20110166526A1 (en) * 1996-02-27 2011-07-07 B. Braun Melsungen Ag Needle tip guard for percutaneous entry needles
US7927314B2 (en) 1996-02-27 2011-04-19 B. Bran Melsungen AG Needle tip guard for percutaneous entry needles
US20060189934A1 (en) * 1996-02-27 2006-08-24 Kuracina Thomas C Needle tip guard for percutaneous entry needles
US20100137815A1 (en) * 1996-02-27 2010-06-03 Kuracina Thomas C Needle tip guard for percutaneous entry needles
US7534231B2 (en) 1996-02-27 2009-05-19 Injectimed, Inc. Needle tip guard for percutaneous entry needles
US20090177167A1 (en) * 1996-02-27 2009-07-09 Thomas Kuracina Needle tip guard for percutaneous entry needles
US6773428B2 (en) * 2000-05-12 2004-08-10 Stephen M. Zappala Implantable delivery system and method for the pharmacologic management of erectile dysfunction
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
US20070073271A1 (en) * 2003-11-15 2007-03-29 Brucker Gregory G Catheter for diagnostic imaging and therapeutic procedures
US7947049B2 (en) * 2004-03-31 2011-05-24 Bausch & Lomb Incorporated IOL injector
US20050222578A1 (en) * 2004-03-31 2005-10-06 Edward Vaquero IOL injector
US20080097339A1 (en) * 2006-08-31 2008-04-24 Medrad, Inc. Catheter with filtering and sensing elements
US8876754B2 (en) 2006-08-31 2014-11-04 Bayer Medical Care Inc. Catheter with filtering and sensing elements
US8333741B2 (en) * 2006-11-10 2012-12-18 Bausch & Lomb Incorporated Phacoemulsification cannula with improved purchase
US20080114313A1 (en) * 2006-11-10 2008-05-15 Gomez Mario P Phacoemulsification cannual with improved purchase
US20090292272A1 (en) * 2008-05-21 2009-11-26 Becton, Dickinson And Company Conical diffuser tip
US8974411B2 (en) 2008-05-21 2015-03-10 Becton, Dickinson And Company Conical diffuser tip
US20100233649A1 (en) * 2009-03-11 2010-09-16 Mcpeek John W Device for sonic irrigation and aspiration of a root canal and method of use thereof
US8672895B2 (en) 2011-02-28 2014-03-18 Injectimed, Inc. Needle guard
US8764711B2 (en) 2011-02-28 2014-07-01 Injectimed, Inc. Needle guard
US8821439B2 (en) 2011-02-28 2014-09-02 Injectimed Inc. Needle guard
US8273056B2 (en) 2011-02-28 2012-09-25 Injectimed, Inc. Needle guard with resilient spring surrounding tip shield
US9238104B2 (en) 2011-02-28 2016-01-19 Injectimed, Inc. Needle guard
US9399119B2 (en) 2011-02-28 2016-07-26 Injectimed, Inc. Needle guard
US9440052B2 (en) 2011-02-28 2016-09-13 Injectimed, Inc. Needle guard
US9610403B2 (en) 2011-02-28 2017-04-04 Injectimed, Inc. Needle guard
US8414539B1 (en) 2011-12-27 2013-04-09 B. Braun Melsungen Ag Needle tip guard for percutaneous entry needles

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Effective date: 19820412