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Publication numberUS2845072 A
Publication typeGrant
Publication date29 Jul 1958
Filing date21 Jun 1955
Priority date21 Jun 1955
Publication numberUS 2845072 A, US 2845072A, US-A-2845072, US2845072 A, US2845072A
InventorsWilliam A Shafer
Original AssigneeWilliam A Shafer
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Surgical knife
US 2845072 A
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Description  (OCR text may contain errors)

July 29, 1958 w. A. sHAl-'ER 2,845,072

SURGICAL KNIFE Filed June 21, 1955 imail, Amplif/ar W//idm 'A Shafer 1N VEN TOR.

wrydvgnv United States Patent O SURGICAL KNIFE William A. Shafer, Erie, Pa.

Application June 21, 1955, Serial No. 516,967

2 Claims. (Cl. 128-303.14)

This invention relates generally to surgical knives, and more particularly to instruments having reciprocating blades.

The primary object of the present invention resides in the provision of a surgical knife having means for reciprocating the blade at a controlled frequency to thereby enable a physician to undertake delicate surgical procedures by minimizing the possibility of tearing.

A further object of the invention resides in the provision of a surgical knife which minimizes the pain of cuttingrdue to the fact that the blade is reciprocating at high speeds to which the patients body is not immediately sensitive.

A further object of the invention resides in the provision of a surgical knife having a reciprocating blade the frequency of which may be controlled so that the blade is reciprocated at a desired frequency for various procedures.

Still further objects and features of this invention reside in the provision of a surgical knife that is simple in construction, highly efficient in operation, relatively light in weight and easily carried, and which is highly eicient in use while being relatively inexpensive to produce, thereby permitting wide distribution and utilization.

These, together with the various ancillary objects and features of the invention which will become apparent as the following description proceeds, are attained by this surgical knife, a preferred embodiment of which has been illustrated in the accompanying drawings, by way of example only, wherein:

Figure l is a perspective view of a surgical knife according to my invention;

Figure 2 is alongitudinal sectional view as taken along the plane of line 2-2 in Figure l and showing the surgical knife in an enlarged scale;

Figure 3 is a horizontal sectional view as taken along the plane of line 3 3 in Figure 2;

Figure 4 is a schematic diagram of the electrical components of the invention.

With continuing reference to the accompanying drawings wherein like reference numerals refer to similar parts throughout the various views, and with initial attention directed to the embodiment of the invention of Figure l, reference numeral 20 is used to generally designate the surgical knife comprising the present invention. This surgical knife includes a shaft 22 receivable within a casing 24 which has threadedly secured thereto, as at 26, the neck portion 28 of a housing 30 which is formed 1n two parts that are threadedly secured to each other, as

v2,845,072 Patented July 29, 1958 at 32, the upper portion of the housing 34 having a threaded neck portion 36 to which an upper portion 38 of the casing is threadedly secured.

Mounted within the casing 24 is a bearing 40 of nylon or other suitable material through which the shaft 2.2 extends, the bearing 40 forming a suitable guide for the reciprocating shaft 22. Detachably secured by means of a conventional detachable blade connection is a surgical blade 42 of conventional construction.

Within the housing 30, there is located a piezoelectric crystal 44 having a plate 46 at its lower end which has a threaded tubular socket 48 to which the upper threaded end of the shaft 22 is attached. This plate 46 is grounded to the frame, and an upper plate 50 of the crystal 44 has a conductor 52 connected thereto which extends through the guide portion 54 of the casing 38. A second lead S6 is grounded to the casing, as at 58. A variable audio oscillator 60 is connected to the crystal 44 through the audio amplier 62 and by varying the frequency of the output of the oscillator 60 and therefore the amplifier 62, the crystal 44 will cause the plate 46 to vibrate at a predetermined and controlled rate. The housing 30 is formed in sections so as to permit the ready replacement of the crystal 44, as desired.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

l. A surgical knife comprising a casing, a shaft mounted in said casing for reciprocating movement and having an end portion extending outwardly of said casing, a blade detachably secured to said shaft, drive means in said casing for reciprocating said shaft, and control means for controlling the frequency of the reciprocatory movement imparted to said shaft by said drive means, said drive means including a piezoelectric crystal connected to said shaft, said control means comprising a variable audio oscillator coupled through an amplifier to said piezoelectric crystal.

2. A surgical knife comprising a casing, a shaft mounted in said casing for reciprocating movement and having an end portion extending outwardly of said casing, a blade detachably secured to said shaft, drive means in said casing for reciprocating said shaft, and control means for controlling the frequency of the reciprocatory movement imparted to said shaft by said drive means, said drive means including a piezoelectric crystal connected to said shaft, said control means comprising a variable audio oscillator coupled through an amplifier to said piezoelectric crystal, said casing having a housing for said piezoelectric crystal detachably secured thereto.

References Cited in the tile of this patent UNITED STATES PATENTS 1,675,805 Holcomb July 3, 1928 1,966,446 Hayes July 17, 1934 2,714,890 Vang Aug. 9, 1955 2,730,103 Mackta Ian. 10, 1956

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1675805 *28 Sep 19273 Jul 1928Robert F CameronElectric razor
US1966446 *14 Feb 193317 Jul 1934Harvey C HayesImpact tool
US2714890 *6 Aug 19539 Aug 1955Vang AlfredVibratory surgical instruments
US2730103 *22 Nov 195410 Jan 1956Mackta LeoMagnetostrictive cutting tool
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3360664 *30 Oct 196426 Dec 1967Gen Dynamics CorpElectromechanical apparatus
US3378429 *4 Jan 196516 Apr 1968Branson InstrMethod and apparatus for treating material with sonic energy
US3452741 *27 May 19661 Jul 1969Schaffer Richard CConetome
US3832776 *24 Nov 19723 Sep 1974H SawyerElectronically powered knife
US3888004 *20 Sep 197410 Jun 1975Coleman Donald JacksonUltrasonsically vibrated surgical cutting instrument
US4750488 *27 Feb 198714 Jun 1988Sonomed Technology, Inc.Vibration apparatus preferably for endoscopic ultrasonic aspirator
US4750902 *19 May 198614 Jun 1988Sonomed Technology, Inc.Endoscopic ultrasonic aspirators
US4832683 *15 Jul 198623 May 1989Sumitomo Bakellite Company LimitedSurgical instrument
US4922902 *16 Dec 19878 May 1990Valleylab, Inc.Method for removing cellular material with endoscopic ultrasonic aspirator
US5211646 *19 Sep 199118 May 1993Alperovich Boris ICryogenic scalpel
US5261922 *20 Feb 199216 Nov 1993Hood Larry LImproved ultrasonic knife
US5334183 *9 Apr 19922 Aug 1994Valleylab, Inc.Endoscopic electrosurgical apparatus
US5342380 *29 Apr 199330 Aug 1994Hood Larry LUltrasonic knife
US5695510 *12 Aug 19949 Dec 1997Hood; Larry L.Ultrasonic knife
US5810859 *28 Feb 199722 Sep 1998Ethicon Endo-Surgery, Inc.Apparatus for applying torque to an ultrasonic transmission component
US5935142 *7 Aug 199710 Aug 1999Hood; Larry L.Cavitation-assisted method of material separation
US5935143 *7 Aug 199710 Aug 1999Hood; Larry L.Ultrasonic knife
US5968060 *28 Feb 199719 Oct 1999Ethicon Endo-Surgery, Inc.Ultrasonic interlock and method of using the same
US5989275 *28 Feb 199723 Nov 1999Ethicon Endo-Surgery, Inc.Damping ultrasonic transmission components
US6004335 *12 Feb 199621 Dec 1999Ethicon Endo-Surgery, Inc.Ultrasonic hemostatic and cutting instrument
US627496331 Aug 199914 Aug 2001Ethicon Endo-Surgery, Inc.Methods and devices for controlling the vibration of ultrasonic transmission components
US637937115 Nov 199930 Apr 2002Misonix, IncorporatedUltrasonic cutting blade with cooling
US6443969 *15 Aug 20003 Sep 2002Misonix, Inc.Ultrasonic cutting blade with cooling
US651426726 Mar 20014 Feb 2003Iep Pharmaceutical Devices Inc.Ultrasonic scalpel
US73611724 Jun 200322 Apr 2008Sound Surgical Technologies LlcUltrasonic device and method for tissue coagulation
US8317726 *15 Jun 201027 Nov 2012Boston Scientific Scimed, Inc.Biopsy forceps assemblies
US83431782 Aug 20051 Jan 2013Misonix, IncorporatedMethod for ultrasonic tissue excision with tissue selectivity
US8672859 *23 Oct 201218 Mar 2014Boston Scientific Scimed, Inc.Biopsy forceps assemblies
US20100318119 *15 Jun 201016 Dec 2010Boston Scientific Scimed, Inc.Biopsy forceps assemblies
US20130085412 *23 Oct 20124 Apr 2013Tyler TimberlakeBiopsy forceps assemblies
DE3507672A1 *5 Mar 198511 Sep 1986Otto MeyerInstrument with a surgical tool for severing or suturing tissues
DE10114672A1 *23 Mar 200126 Sep 2002Hesse & Knipps GmbhUltrasonic vibrator e.g. for machine tool, has vibration element in form of plate to which ultrasonic vibration generator is attached on one side of plate
EP0711128A1 *31 Mar 199415 May 1996Ethicon Endo-Surgery, Inc.Ultrasonic surgical instrument and methods for manufacturing
Classifications
U.S. Classification606/169, 30/45, 310/328
International ClassificationA61B17/32
Cooperative ClassificationA61B17/320068, A61B17/3213
European ClassificationA61B17/32U