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Publication numberUS3906626 A
Publication typeGrant
Publication dateSep 23, 1975
Filing dateApr 19, 1974
Priority dateApr 19, 1974
Publication numberUS 3906626 A, US 3906626A, US-A-3906626, US3906626 A, US3906626A
InventorsArduino Riuli
Original AssigneeBecton Dickinson Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Disposable surgical scalpel
US 3906626 A
A unitary disposable surgical scalpel is disclosed which has a sheath for the blade and means for permanently sheathing the blade so that at the option of the operator the blade may be permanently covered for safe disposal.
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Description  (OCR text may contain errors)

United States Patent 191 Riuli Sept. 23, 1975 1 DISPOSABLE SURGICAL SCALPEL [75] Inventor: Arduino Riuli, Wayne, NJ.

[73] Assignee: Becton, Dickinson and Company,

East Rutherford, NJ.

[22] Filed: Apr. 19, 1974 [2]] Appl. No.: 462,320

[52] US. Cl. 30/162; 30/320; 30/335; 30/339 [51] Int. Cl. A61B 17/32; B26B l/O8; B26B 5/00 [58] Field of Search 30/336, 335, 162, 320, 30/293, 151, 163, 164, 337, 338, 339, 329; 128/305 [56] References Cited UNITED STATES PATENTS 456,087 7/1891 Franklin 30/163 469,783 3/1892 Graves 30/162 1,853,672 4/1932 Dodson... 30/162 1,888,488 11/1932 Brown 30/337 X 8/1936 Christianson 30/320 Keeran 30/162 2,291,514 7/1942 Warner ell a1 30/162 2,611,178 9/1952 Whipple 'et a1.

2,735,176 2/1956 Costin,........'

3,025,598 3/1962 Nissen..

3,171,201 3/1965 Carifi 30/162 X FOREIGN PATENTS OR APPLICATIONS 853,565 12/1939 France....., 30/162 Primary Examiner-Al Lawrence Smith Assistant Examiner.l. T. Zatarga Attorney, Agent, or Firm-Kane, Dalsimer, Kane, Sullivan and Kurucz [57 ABSTRACT A unitary disposable surgical scalpel is disclosed which has a sheath for the blade and means for permanently sheathing the blade so that at the option of the operator the blade may be permanently covered for safe disposal.

4 Claims, 9 Drawing Figures US Patent Sept. 23,1975 Sheet 2 of4 3,906,626

US Patent Sept. 23,1975 Sheet 3 of4 3,906,626

US Patent Sept. 23,1975 Sheet 4 OM 3,906,626

1 l DISPOSABLE SURGICAL SICALPEL B CKGROUND or THE INVENTION 1 basic designiln recent years'the commercially -important surgical scalpels have been those having disposable blade portions. Illustrative of this type of surgical scalpel is that disclosed in UIS. Pat. No. 3,412,467. In this type of scalpel the blade component is detachable from the handle component and disposed of by deposit in a special container which may thereafter be handled without hazard. It will be appreciated, however, that such disposable surgical. scalpels still present a hazard to the individual who must, detach and transfer the blade component. V I

US. Pat. No. 2,735,176 discloses a veterinary surgical knifewhich comprises a hollow handle component having a slidably extensible blade. A similar cutting instrument isdisclosedin US. Pat. No. 2,512,237. In effect, the latter instruments employthe handlecomponent as a sheath for the blade component when not in use- Su c;h sheathable blades are notcontemplated for disposal after a single use. Furthermore, such cutting instrumentsdo not provide a positive means for preventing an unsheathing of thevblade portion by a care- 7 :of the prior art problems. First, the surgical scalpel of this invention includes a means of sheathing the blade component without risking the hazards of blade re moval. Second, once sheathed, accesssto the blade component is permanently denied thereby assuring that the scalpel will never'be reused and will never offer a hazard to individuals charged with ultimate disposal of the scalpel.

SUMMARY OF THEINVENTION I The invention comprises a surgical scalpel which comprises; a handle, a cutting blade attached to said handle, a sheath for said blade and means for permanently sheathing said-blade with said sheath.

The term permanentl y sheathing the blade as used herein.means sheathing the blade component of the surgical scalpel in such a manner that it cannot be unsheathed without destroying the sheath comp onent.

- BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is anisome tric drawing of a preferred embodiment of the invention showing a surgical scalpel with sheath assembly. The sheath is shown in the position employed prior to use.

FIG. 2 is an isometric view of the scalpel shown in FIG. 1 but with the sheath in a retracted or operating position exposing the cutting blade.

"FIG. 1 with theshe ath locked in bl'y of FlG. lin disassembly a i v FIG; 5 is a cross-sectional viemak mopg IinesSf- S 2 FIG. 3 is an isometric view showing the scalpel of P m ent. b e

protecting position after use.

A 1 FIG. 4 is a schematic view showing the scalpeliassemofFIG. 1. v, u FIG. 6 is a cross-sectional view taken along lines'6f 6 of FIG.2. j F IG. 7 is 'a cross-sectional view taken along lines 77 0fFIG.3. p I y,

FIG. 8 is'a cross-sectionalview taken along line s.8-8 OfFIG. 2. I H I I FIG. 9 is a cross-sectional viewtaken along lines 99-9:

ofFIG.2. Y I I i v DETAILED DESCRIPTION OF THE INVENTION The apparatus ,of the invention is conveniently fabri cated by conventional and standard methods for pre-, paring surgical scalpels using conventional and standard materials. For example the blade component of the surgical scalpel may be the standard surgical steel blades conventionally employed. The handle and sheath components of the scalpel may be fabricated from conventionalpolymer materials such as, for example, polystyrene, polycarbonate, polyurethane, polyethylene, phenol-formaldehyde resins, polybutylene and the like. i v I The means employed for permanently sheathing the blade component of the scalpel of the invention may be any means whereby the sheath componentis firmly atfixed in a position covering the blade component. In general, this is conveniently accomplished by any locking means obtained by the cooperation of sheath and handle components. Fonexample, a deadbolt can be recessed in the handle and spring loaded. The sheath can then have arecess formed on itsinterior surface for receiving and engaging the deadbolt when aligned with that deadbolt. In operation then, the deadbolt is depressed and the sheath slid over it to a position wherein the sheath covers the blade component and engages the deadbolt soas to: become firmly and permanently fixed in .that position.

A preferredembodiment of the scalpel of the invention is one wherein thehandle, bladeand sheath comprise a unitary assembly The term unitary? as used herein means a single, one-part assembly. Thus, handle, bladeandsheath are all attachedin such a manner that theyv are inseparable,,one from the other. The advan tage of such a ;unitary construction resides in its convenience, and the fact that the sheath cannot become separated from the=blade and lostrln a particularly preferred embodiment within the scope of the invention the sheath forms a gripping surface for thehandle when the blade is .unsheathed. The term gripping surface" as used herein means a surface which by; itsdesign enhances and facilitates holding gers. t

the scalpel with one's fin- The apparatus. of the invention will now be further described and exemplified by referenceto the various specificembodiments set forth'in the' drawings.

FIG. 1 is an overall view of'a disposable unitary assembly embodiment of the invention. As shown in the illustration of FIG. 1, the surgical scalpel comprises a handle 10 which comprises a butt 12 and a shank 14 which is reduced in thickness and over which sheath 16 may slide. Sheath 16 is shown in a position covering the blade component of the surgical scalpel. The sheath position illustrated in FIG. 1 is for covering and protecting the blade component prior to use. It will be seen from FIG. 1 that the sheath has a resilient detent 26 which is forced out by the underlying shank 14 to a position whereitblocks forward movement of the sheath by meeting with cam' 28. Cam 28 is an integral part of shank 14. Details of this position locking mechanism are seen with greater clarity by referring now to FIG. 5. F lG. is a cross-sectional view taken along lines 5 5 ofFIGIl. FIG. 5 further shows the construction of the sheath 16 and the underlying portions of shank 14. Thus, sheath 16 is seen to be hollow having an opening 18 proximal to butt 12 and opening 20 proximal to theblade component. Sheath 16 fits over and encloses shank l4 and blade 24. Shank 14 is attached to. blade 24 by its blade supporting end 30. Shank 14 also has a resilient spring member 32 which is preferably integral'with shank 14. Spring 32 imposes a frictional force upon the inner surface 52 of sheath 16. This frictional force serves to hold sheath 16 in a given position. FIG. 5 also shows with greater clarity the blocking of sheath 16 movement forward by detent 26 meeting with cam 28.- 4

FIG. 2 is an overall view of the surgical scalpel apparatus of FIG. 1 showing the sheath 16 in a retracted position exposing blade 24 and blade supporting segment 30. As seen in FIG. 2, sheath 16 has raised surfaces 22 to facilitate gripping and in this rearward position forms a gripping surface for handle 10. v

The features hidden from view in FIG. 2 are seen with greater clarity by reference to FIG. 6, a cross section along lines 6-6 of FIG. 2.As shown in FIG. 6, with the sheath in a rearward position blade 24 is exposed together with the blade supporting end 30 of shank 14. Spring 32 and resilient cam 28 both exert a frictional force upon the inner surface 52 of sheath 16 (see FIG. 9, a cross-sectional view along lines 9-9 of FIG. 2). These frictional forces plus a frictional force from detent 26 exerted against shank l4 all'serve to hold sheath 16 in the operating position. In addition, shank 14 can be tapered so that it is thicker near the butt end 12. In this manner a tight frictional fit'into sheath 16 opening 18 holds the sheath in position. Shoulders 13 of butt 12 also serve as a stop to prevent removal of the sheath over the butt end of the handle Referring now to FIG. 3 the surgical scalpel of the invention is observed withthe sheath in a permanently fixed blade sheathed position. Following use, the sheath is moved forward to cover the blade 24. As shown in FIG. 3, when the sheath I6 is moved to an extreme position away from butt l2, cam 28 forces resilient detent 26 down underneath the surface of shank 14. Referring now to FIG. 7, a cross-sectional view of lines 7-7 of FIG. 3, the locking mechanism, is readily observed which locks sheath 16 permanently into a blade sheathing position. As observed in FIG. 7, detent 26 has been guided by cam 28 down and over the locking lug 50 which is an integral part of shank 14 so that hook 27 at the end of detent 16 is in firm engagement. In this position, sheath 16 can neither be moved forward nor rearward but is in a firmly lockedposition covering blade 24. It will also be observed from FIG. 7 that there is noway' of releasing detent 26 without physical destruction of the sheath 16. V l

Referring now to FIG. 4, the various components making up the surgical scalpelassem'bly of FlG. l are readily observed in their disassembled position. Thus, sheath 16 comprises an elongate sheath open at both ends 18, 20 and having frictional surfaces 22. Integral with sheath 16 is detent 26 having a hook 27 at the unattached end thereof. The handle 10 comprises a butt end 12 and a shank 14. The shank 14 preferably has a narrowed center portion l5,'a spring 32, cam 28 and a locking bar 50 which engages hook 27of detent 26 as previously described. An aperture 48 through shank 14 not only provides for access of the detent 26 when the sheath is moved into a blade protectingpositionbut also provides for a weakened area of shank 14. This weakened area having railings 14a and 14b are easily fractured when the sheath 16 is in a permanently locked blade protecting position. This provides an'easy method of breaking the handle prior to disposal of the surgical scalpel. FIG. 4 also shows the mounting of blade 24 on blade support 31 where it is held in place by bayonet lock 42 and covered by blademounting piece 33. As shown in FIG. 4, the blade 24' is fixedly attached bya bolt 46. However, in apreferred embodiment, blade 24 is permanently attached by ultrasonic welding of blade support3l to blademounting'piece 33 with the blade 24'interposed.

FIG. 8 is a cross-sectional view takenalong lines 8-8 of FIG. 2 and more clearly shows the-"relationship of blade 24 held in position between blade support 31 and blade mounting piece 33. I

What is claimed is: 1

1. A surgical scalpel which comprises,

a handle; i

a cutting blade attached to said handle;

a sheath for said blade. said sheath forming a gripping surface for said I handle when said blade is unsheathed; and

means for permanently sheathing said blade with said sheath.

2. A scalpel of claim 1 wherein said handle, said blade and said sheathcomprise a unitary assembly.

3. A unitary surgical scalpel with sheath assembly which comprises: I

a handle;

a cutting blade affixed to one end of said handle;-

a sheath movably attached to said handle;

means for releasably locking said sheath to said handle when said sheath is moved to a first blade sheathing position; 1

means for releasably locking said sheath to said handle when moved in a blade exposed position; and

means for permanently locking :said sheath to said to a-second handle when said sheath' is moved blade sheathing position." I

4. A scalpel of claim 3 wherein said sheath forms a 0 grippingsurface for said handle when in the bladeexposed position.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US456087 *Nov 4, 1890Jul 14, 1891Charles cRhodolph h
US469783 *Mar 1, 1892 Punch
US1853672 *Jun 8, 1931Apr 12, 1932Dodson Alcada FPocket knife
US1888488 *Sep 5, 1931Nov 22, 1932Robert E BrownKnife
US2051199 *Jan 18, 1935Aug 18, 1936Christianson George MPlaster cutter
US2270655 *Feb 1, 1941Jan 20, 1942Keeran Charles RPocketknife
US2291514 *May 5, 1939Jul 28, 1942Warner Mfg CoHand scraper
US2611178 *Mar 3, 1947Sep 23, 1952Burdette E BostwickPocket implement
US2735176 *May 22, 1953Feb 21, 1956 Veterinary surgical knife
US3025598 *Oct 13, 1958Mar 20, 1962Gillette CoKnife
US3171201 *Sep 3, 1963Mar 2, 1965Ralph CarifiRazor blade holders
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4608757 *Apr 11, 1985Sep 2, 1986Eckerle Douglas WDouble ended throwing knife
US4621425 *Oct 5, 1984Nov 11, 1986Stanley WorksRetractable knife handle
US4790312 *Jan 20, 1987Dec 13, 1988Becton Dickinson Acutecare, Inc.Surgical knife
US4922614 *Apr 29, 1988May 8, 1990Kai Cutlery Center Co., Ltd.Cutter
US4985034 *Jun 1, 1989Jan 15, 1991Board Of Regents, The University Of Texas SystemScalpel
US5060387 *Nov 13, 1990Oct 29, 1991Becton, Dickinson And CompanyBlade handle
US5207696 *Apr 30, 1992May 4, 1993Medical Sterile Products, Inc.Surgical scalpel
US5250063 *Jan 24, 1992Oct 5, 1993Leonard BloomSurgical scalpel with retractable guard
US5258001 *Sep 5, 1991Nov 2, 1993Baylor College Of MedicineRetractable scalpel with blade-activated lock
US5275606 *Mar 30, 1993Jan 4, 1994Leonard BloomGuarded scalpel for surgical use
US5292329 *Dec 4, 1992Mar 8, 1994Werner Richard SRetractable surgical knife
US5299357 *Dec 18, 1991Apr 5, 1994American Safety Razor CompanyDisposable surgical scalpel with safety guard
US5309641 *Dec 8, 1992May 10, 1994American Safety Razor CompanyDisposable surgical scalpel with safety guard
US5330492 *Oct 21, 1992Jul 19, 1994Dlh Concepts, Inc.Safety scalpel
US5330493 *Nov 27, 1992Jul 19, 1994Haining Michael LDisposable scalpel
US5344424 *Mar 12, 1993Sep 6, 1994Roberts Philip LSelectively retractable, disposable surgical knife
US5403337 *Jul 5, 1994Apr 4, 1995Platts; DavidRetractable-bladed surgical scalpel
US5411512 *Nov 12, 1993May 2, 1995Leonard BloomGuarded surgical scalpel
US5417704 *Dec 20, 1993May 23, 1995American Safety Razor CompanyDisposable surgical scalpel with safety guard
US5423843 *Dec 3, 1993Jun 13, 1995Werner; Richard S.Retractable surgical knife
US5431672 *May 9, 1994Jul 11, 1995Becton, Dickinson And CompanySurgical scalpel with retractable blade
US5475925 *Mar 21, 1994Dec 19, 1995Newman; Philip H.Three-piece retractable-bladed knife
US5496340 *Jul 19, 1994Mar 5, 1996Leonard BloomCombination guarded surgical scalpel and blade stripper
US5527329 *Jan 20, 1995Jun 18, 1996Devon Industries, Inc.Surgical scalpel
US5545175 *Aug 8, 1994Aug 13, 1996Leonard BloomDisposable quarded finger scalpel for inserting a line in a patent and lock off therefor
US5556409 *Aug 4, 1995Sep 17, 1996Haining; Michael L.Disposable scalpel
US5569281 *Apr 26, 1995Oct 29, 1996Leonard BloomGuarded surgical scalpel
US5569282 *Jun 13, 1995Oct 29, 1996Werner; Richard S.Retractable surgical knife
US5620454 *Oct 25, 1994Apr 15, 1997Becton, Dickinson And CompanyGuarded surgical scalpel
US5683407 *Oct 19, 1995Nov 4, 1997Becton, Dickinson And CompanyCleanable guarded surgical scalpel with scalpel blade remover
US5730751 *Mar 17, 1995Mar 24, 1998Noble House Group Pty. Ltd.Scalpel
US5749886 *Apr 8, 1996May 12, 1998Leonard BloomDisposable guarded finger scalpel for inserting a line in a patient and blade therefor
US5752968 *Jan 27, 1995May 19, 1998Becton, Dickinson And CompanyGuarded surgical scalpel with scalpel blade remover
US5779724 *May 24, 1996Jul 14, 1998Werner; Richard S.Retractable surgical knife
US5792162 *May 8, 1996Aug 11, 1998Becton, Dickinson And CompanyGuarded surgical scalpel with scalpel blade remover
US5827309 *Oct 19, 1995Oct 27, 1998Becton, Dickinson And CompanyGuarded surgical scalpel with scalpel blade remover
US5830226 *May 2, 1997Nov 3, 1998Eagle Vision, Inc.Microsurgical scalpel assembly
US5868771 *Jul 25, 1997Feb 9, 1999Pabban Development, Inc.Scalpel blade cover
US5876416 *Sep 5, 1997Mar 2, 1999Hill; Frank C.Surgical knife
US5938675 *Jun 18, 1996Aug 17, 1999Beckton, Dickinson And CompanySurgical scalpel
US6022364 *Oct 18, 1996Feb 8, 2000Flumene; Antonio GiovanniDisposable surgical safety scalpel
US6626925 *Mar 29, 2001Sep 30, 2003Becton Dickinson And CompanyShielded surgical scalpel
US6757977Jan 25, 2002Jul 6, 2004Jai Surgicals LimitedDisposable surgical safety scalpel
US6887253Nov 27, 2001May 3, 2005Steve SchragaLancet depth adjustment assembly
US6918918Apr 29, 2002Jul 19, 2005Steven SchragaSingle use lancet assembly
US6949111Feb 20, 2001Sep 27, 2005Steven SchragaLancet device
US6958072Jun 13, 2002Oct 25, 2005Steven SchragaSingle use lancet device
US6979340Apr 9, 2004Dec 27, 2005Edward BilenskiSingle use, self-contained twist resistant surgical knife
US7022128Apr 22, 2003Apr 4, 2006Becton, Dickinson And CompanySurgical knife safety handle
US7024773 *May 23, 2003Apr 11, 2006Jennings Dale ESafety cutter with retracting guard
US7087067 *Oct 9, 2003Aug 8, 2006Kehr Surgical Private Ltd.Surgical scalpel with protective sheath
US7172611Mar 22, 2004Feb 6, 2007Becton, Dickinson And CompanySurgical scalpel assembly
US7285110Jun 10, 2003Oct 23, 2007P. Rowan Smith, Jr.Retractable hypodermic safety syringe
US7387637Apr 21, 2004Jun 17, 2008Becton, Dickinson And CompanySurgical knife safety handle
US7575583Oct 11, 2005Aug 18, 2009Steven SchragaSingle use lancet device
US7678126May 3, 2005Mar 16, 2010Steven SchragaLancet depth adjustment assembly
US7901422Oct 31, 2007Mar 8, 2011Beaver-Visitec International (Us), Inc.Surgical knife safety handle
US7905894Oct 31, 2007Mar 15, 2011Beaver-Visitec International (Us), Inc.Surgical knife safety handle
US7909840Oct 19, 2005Mar 22, 2011Beaver-Visitec International (Us), Inc.Surgical knife safety handle having user operable lock
US8034069May 24, 2010Oct 11, 2011Steven SchragaSingle use lancet assembly
US8048097Jul 15, 2005Nov 1, 2011Steven SchragaSingle use lancet assembly
US8114103 *Sep 14, 2005Feb 14, 2012James Edwin RascoScalpel blade protector
US8118825Nov 18, 2003Feb 21, 2012Steven SchragaLancet device
US8256330Nov 17, 2009Sep 4, 2012Alcon Research, Ltd.Guarded surgical knife handle
US8256331Nov 17, 2009Sep 4, 2012Alcon Research, Ltd.Guarded surgical knife handle
US8353924Oct 11, 2011Jan 15, 2013Stat Medical Devices, Inc.Single use lancet assembly
US8387798 *May 17, 2012Mar 5, 2013Abdulmohsen E. A. H. Al-TerkiMutiple oral and nasal surgical procedures method and kit
US8464430Feb 7, 2008Jun 18, 2013Beaver-Visitec International (Us), Inc.Retractable safety knife
US8603124 *Nov 23, 2011Dec 10, 2013Robert HatchModified surgical scalpel with polyurethane mated sheath for ultrasound assisted carpal tunnel surgery
US8715309Feb 21, 2012May 6, 2014Steven SchragaLancet device
US8764781Jul 24, 2012Jul 1, 2014Alcon Research, Ltd.Guarded surgical knife handle
US8814893Dec 22, 2010Aug 26, 2014Beaver-Visitec International (Us), Inc.Surgical knife safety handle having user operable lock
US8814896Jan 15, 2013Aug 26, 2014Stat Medical Devices, Inc.Single use lancet assembly
US20100089405 *Apr 3, 2009Apr 15, 2010Tactical Medical Solutions, Inc.Combination tracheal hook and surgical blade
US20100228274 *Apr 28, 2008Sep 9, 2010Poly Medicure LimitedSurgical safety scalpel
US20120215241 *Apr 19, 2012Aug 23, 2012Oasis Medical, Inc.Micro surgical knife with safety feature
USRE42507Jan 26, 2001Jun 28, 2011Aspen Surgical Products, Inc.Surgical scalpel
DE3722899A1 *Jul 8, 1987Jan 19, 1989Peters TimScalpel
EP0583992A1 *Aug 20, 1993Feb 23, 1994Winston Daniel ShaerShield for scalpel blade
EP0612506A2 *Feb 9, 1994Aug 31, 1994Becton Dickinson and CompanySurgical scalpel for making controlled depth and width inscisions
EP0622050A1 *Apr 27, 1994Nov 2, 1994Eagle Vision Inc.Microsurgical scalpel assembly
EP0692223A1 *Jul 15, 1994Jan 17, 1996Michael Lynn HainingDisposable scalpel
EP0701798A1Jul 12, 1995Mar 20, 1996Michael R. AbidinCombination guarded surgical scalpel and blade stripper
EP0751748A1 *Mar 17, 1995Jan 8, 1997Noble House Group Pty. Ltd.Scalpel
EP0769276A1 *Oct 9, 1996Apr 23, 1997Becton Dickinson and CompanyCleanable guarded surgical scalpel with scalpel blade remover
WO1993011916A1 *Dec 17, 1992Jun 24, 1993American Safety RazorDisposable surgical scalpel with safety guard
WO1994013216A1 *Jun 22, 1993Jun 23, 1994Richard S WernerRetractable surgical knife
WO1995015122A1 *May 23, 1994Jun 8, 1995Richard S WernerRetractable surgical knife
WO1995024855A2 *Mar 17, 1995Sep 21, 1995Jagmohanbir Singh DillonScalpel
WO1996001080A1 *Jul 5, 1995Jan 18, 1996Innovative Surgical TechnologyRetractable-bladed surgical scalpel
WO1996006571A1 *Aug 31, 1994Mar 7, 1996Mark L DoerreSelectively retractable, disposable surgical knife
WO1997029891A1 *Feb 14, 1997Aug 21, 1997Jagmohanbir Singh DillonCutter assembly
WO2006044865A2 *Oct 19, 2005Apr 27, 2006Becton Dickinson CoSurgical knife safety handle having user operable lock
U.S. Classification30/162, 30/320, 30/339, 30/335
International ClassificationA61B17/32
Cooperative ClassificationA61B17/3213, A61B2017/32113, A61B17/3217, A61B17/3215
European ClassificationA61B17/3213, A61B17/3215, A61B17/3217