CA1258021A - Angulated ultrasonic surgical handpieces and method for their production - Google Patents

Angulated ultrasonic surgical handpieces and method for their production

Info

Publication number
CA1258021A
CA1258021A CA000524050A CA524050A CA1258021A CA 1258021 A CA1258021 A CA 1258021A CA 000524050 A CA000524050 A CA 000524050A CA 524050 A CA524050 A CA 524050A CA 1258021 A CA1258021 A CA 1258021A
Authority
CA
Canada
Prior art keywords
connecting body
transducer
straight
ultrasonic surgical
surgical handpiece
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
Application number
CA000524050A
Other languages
French (fr)
Inventor
Alexander Kreizman
Alan Broadwin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Covidien AG
Cooper Lasersonics Inc
Original Assignee
Cooper Lasersonics Inc
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
Application filed by Cooper Lasersonics Inc filed Critical Cooper Lasersonics Inc
Application granted granted Critical
Publication of CA1258021A publication Critical patent/CA1258021A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/007—Methods or devices for eye surgery
    • A61F9/00736—Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments
    • A61F9/00745—Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments using mechanical vibrations, e.g. ultrasonic
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/84—Drainage tubes; Aspiration tips
    • A61M1/85—Drainage tubes; Aspiration tips with gas or fluid supply means, e.g. for supplying rinsing fluids or anticoagulants

Abstract

ABSTRACT
An improved ultrasonic surgical handpiece (10) includes an angled connecting body (72) between the transducer (70) and operative tip (74), with the connecting body being bent at a location between the node and antinode at its respective ends and with a second nodal plane support in the transducer section.
The vibrating assembly (14) is impedance matched to the frequency of a handpiece employing a straight connecting body of substantially equal length and dimension whereby straight and angulated handpieces may be interchangeably used in an ultrasonic surgical system employing a common drive and common operative tips. In a preferred embodiment, the ultrasonic transducer has a nodal plane midway between its ends and is supported at this nodal plane.

Description

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2ANDPIECES AND METHOD E'OR

-6Field of the Invention _ 7This invention relates to ultrasonic surgical 8 instruments useful in removing tissue from within a 9 biological structure, and more particularly to an improved ultrasonic surgical handpiece employing a 11 transducer and an angled connecting body, and to an 12 improved me~hod of producing such an instrument.
13 Description of the Prior Art -14 Ultrasonic surgical instruments, generally referred to as handpieces, first met acceptance for use lÇ in eye surgery, particularly in the removal of cata-17 racts, and presently are widely used for various sur-18 gical procedures. The known ultrasonic handpieces 19 generally employ piezoelectric or magnetostrictive transducers capable of transforming high fre~uency 21 electrical ener~y into mechanical impulses or vibra-22 tions and essentially consist of an elongated trans-23 ducer having one end rigidly joined, as by brazing or 24 welding, to an elongated connecting member which, in turn, supports an elongated operative probe or tip on 26 its other end. The vibrating electromechanical assem-27 bly, including the ~ransducer, connecting member and 28 probe, are supported by a housing through connecting 29 means which isolates the housing from the mechanical vibrations and provides connections for cooling fluid 31 for the assembly and electrical energy to drive the 32 transducer. Known ultrasonic handpieces of this 33 general type are disclosed, for example, in U.S. Patent 34 Nos. 3,693,613 and 3,805,787.

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~2~ z~a 1 The k~own ultrasonic handpieces in which the oper-
2 ative probe extends coaxially with the housing gener-
3 ally are constructed as 3/4 ~ ~ransducers, i.e., the
4 length of ~he transducer and connecting member consti-tute 3J4 of a wavelength, and a matched 1/4 ~ tip oper-6 ative probe mounted on the connecting member completes 7 the full wavelength, with the tip connecting plane 8 being at or closely adjacent to the nodal plane. While g these ultrasonic handpieces are widely used in the surgical theatre, their straightline design limits 11 their utility for certain proceduresO For example, 12 when the operative site is deep within a biological 13 body, good visibility is not always possible since the 14 housing and the surgeon's hand supporting the housing may interfere with the line of sight to the operative 16 tip. Also, such prior art straight ultrasonic hand-17 pieces are of particularly limited utility in micro-18 surgery because the handpiece and the surgeon's hand 19 interfere with the operating microscope.
One attempt to provide an ultrasonic surgical 21 handpiece to overcome the difficulties of the straight 22 handpieces described above is disclosed in U.S. Patent 23 4,526,571. In this prior art device, a conventional 24 straight transducer assembly is employed to the con-ventional nodal point mounting for the operative tip, 26 but a 1/2 ~ curved extension is inserted between the 27 operative probe and its conventional mounting point to 28 provide in effectl a 3/4 ~ extension in which the lon-29 gitudinal axis of the operative tip is displaced at an angle, for example, 15, from the longitudinal axis of 31 the transducer assembly. This assembly has success-32 fully solved the problem of visibility at the operative33 site when working in a deep, restrictive access body 34 opening, but the added length of the overall assembly may reduce the ability of the device to be used in 36 conjunction with an operating microscope in certain 1 conditions. Further,~some surgeons accustomed to hand-2 ling the shorter straight handpieces find it difficult 3 to interchange the longer handpiece because of the 4 difference in maneuverability and balance. Thus, there remains a need for an improved surgical handpiece 6 designed to provide improved visibility at the oper-7 ative tip and to provide minimal interference with an 8 operating microscope.
9 It is al~o known ~hat longitudinal ultrasonic vibrations may be transmitted through an elongated 11 member made up of alternate straight and curved or bent 12 sections. For example, U.S. Patent No. 3,546,498 dis-13 closes a transmission line made up of a series of 14 straig~lt segments joined by short radius bends located at critical locations, i.e., the nodes or antinodes in 16 the transmission element.
17 A primary object of the present invention is to 18 provide an improved ultrasonic surgical handpiece which 19 overcomes the shortcomings of the prior art handpieces discussed above.
21 Another object is to provide an improved angled 22 ultrasonic surgical handpiece which is shorter and more 23 maneuverable than the known curved handpieces.
24 Another object is to provide such an ultrasonic surgical handpiece employing a connecting body which is 26 bent at a location between the nodal and anti-nodal 27 planes adjacent to its ends whereby the axis of the 28 operative tip is disposed at an angle with respect to 29 the axis of the transducer.
Another object is to provide such an ultrasonic 31 surgical handpiece having an improved balance in the 32 surgeon's hand and which is therefore more maneuverable 33 and less fatiguing in use.
34 Another object is to provide such an improved ultrasonic surgical handpiece for use in connection 36 with operating microscopes and which will not ~;~S~23~

1 substantially interfere with the use of such 2 microscopes when using at least a 300 millimeter 3 objective lens.
4 Another object is to provide such an ultrasonic handpiece in which the operative tip and drive compo-6 nents of compatible straight and angled handpieces may 7 be interchanged.
8 Another object of the invention is to provide a 9 means for producing an angled ultrasonic surgical hand-piece which is sufficiently short to be both maneu-11 verable and less fatiguing in the surgeon's hand while 12 not substantially interfering with the use of an oper-13 ating microscope, and in which a 1/4 ~ operative tip of 14 a compatible straight handpiece may be employed.
SUMMARY OF THE INVENTION
16 In the attainment of the foregoing and other 17 objects and advantages of the invention,~an important 18 feature resides in providing an improved angulated 19 ultrasonic surgical handpiece which may be used inter-changeably with known straight handpieces by operating 21 room personnel with a ~inimum of confusion. The hand-22 piece is designed to plug into and operate with commer-23 cially available compatible console systems of corre-24 sponding frequency and to function with existing sur-gical tips supplied for use with such commercially 26 available compatible straight handpieces. This is 27 accomplished by providing a connecting member bent at 28 an angle to the longitudinal axis of the transducer at 29 a point inteLmediate the connector body ends, i.e., between the nodal and antinodal planes at the ends of 31 the connecting body, and by impedance matching the 32 angled transducer to the compatible straight transducer 33 and to the interchangeable tip at the desired operating 34 frequency. To accomplish this, the angled and straight connecting bodies are constructed of the same axial 36 length, and a portion of the mass of the angled con-~;~S~'~2~L

1 nector body is removed at or near the nodal plane, 2 i.e.~ near the point of connec~ion of the operative 3 tip. Preferably, this material is removed by milling 4 flats from two opposite sides of the connector body, with the flats lying in planes parallel to the plane 6 containing the longitudinal axes o the straight and 7 an~led portions of the connecting body.
8 Brief Description of the Drawings 9 The foregoing and other features and advantages of the invention will be apparent from ~he detailed des-11 cription contained hereinbelow, taken in conjunction 12 with the drawings, in which:
13 Fig. 1 is a longitudinal sectional view of a prior 14 art straight ultrasonic surgical handpiece over which the present invention is an improvement;
16 Fig. 2 is a plan view, partially in section, of 17 the transducer assembly and operative tip portion of an 18 ultrasonic surgical handpiece embodying the present 19 invention;
Fig. 3 is an elevation view of the ap~aratus shown 21 in Fig. 2.;
22 Fig. 4 is an enlarged elevation view of ~he con-23 nector body portion of the apparatus shown in Fig. 3;
~4 Fig. 5 is a sectional view taken on line 5-5 of Fig. 4; and 26 Fig. 6 is a composite view showing the longitu-27 dinal axes of a straight and an angled handpiece super-28 imposed.
2g Fig. 7A is a partial elevation view in partial cross section of the angled handpiece of this invention 31 showing the support means located at the nodal plane.
32 Fig. 7B is a cross section of the embodiment of 33 Fig. 7A at the nodal plane Z-Z.
34 Description of the Preferred Embodiment Referring now to the drawings in detail, Fig. 1 36 shows an ultrasonic aspirator of the general type ~5~

1 illustrated, for example, in U.S. Patent No. 3,693,~13, 2 still widely used in surgical practice and over which 3 the present invention is an improvement. The ultra-4 sonic surgical handpiece is indicated generally by the reference numeral lQ and includes a housing member 12 6 enclosing and supporting the vibration-inducing assem-7 bly indicated generally by the numeral 14. Assembly 14 8 includes a magnetostrictive transducer element 16 and 9 an ampliEying or connecting member or body 18 having a removable operative tip 20 mounted on its distal end.
11 High frequency electrical energy to drive the ~rans-12 ducer is provided through conductors 22 connected to a 13 coil 24 surrounding the transducer 16 within the 14 housing 12. Cooling fluid is circulated through the housing by way of inlet and outlet conduits 26, 28, 16 respectively.
17 The vibrating body assembly 14 is mounted within 18 the cavity 30 of a support element 32 which, in turn, 19 is mounted on the end of and projects into the housing 12. A pair of resilient gasket members 36 disposed one 21 on each side of a radially extending flange 34 support 22 and effectively isolate the element 32 and housing 12 23 from vibrations induced by the assembly 14.
24 An irrigation and aspiration fluid housing 38 is mounted on the end of support element 32 as by threaded 26 connection 40, and retains the resilient gasket members 27 36 firm]y in position. A fluid inlet 42 communicates 28 with a cylindrical fluid chamber 44 between the hollow 29 cylindrical body portion 46 of the housing 38 and the outer surface of the elongated tubular portion 48 of 31 the connecting member 18. A resilient O-ring seal 50 32 is provided between members 46 and 48 to prevent the 33 flow of irrigation fluid toward the handpiece~ A
34 removable sleeve member 52 is mounted on the distal end of housing 38 and extends in surround relation to the 36 operative tip 20.

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1 An aspiration passage 56 extends longitudinally 2 through probe 20 from its free end and communicates 3 with an axial passage in the elongated tubular portion 4 46 of the connecting body 18. Passage 58 has an outlet communicating with a chamber 60 within housing 38 6 between the O-ring seal 50 and the gasket seal members 7 46, and an outlet conduit 62 communicating with the 8 chamber 60 is connected to a source of vacuum for aspi-g rating irrigation fluid and emulsified tissue from the operative site.
11 The basic construction and operation of the ultra-12 sonic suryical handpiece according to the present 13 invention is substantially similar to the prior art 14 device just described with the exception of the con-figuration of the vibration-inducing assembly and 16 accordingly only the vibrating components of the ultra-17 sonic surgical handpiece of the present invention are 18 illustrated in the drawings and described herein.
19 Referring initially to Fig. 2, in accordance with the preferred embod;ment of the invention, the vibra-21 ting structure 68 includes a magnetostrictive trans-22 ducer element 70 rigidly mounted on and supported by a 23 transmitter element or connecting body 72 adapted to be 24 mounted in a support element and housing in the manner described abover ~he magnetostrictive element 70 and 26 connecting body 72 together make up a 3/4 A transducer 27 assembly, and a 1/4 ~ operative tip 74 is mounted on 28 the opposite end of the connecting body to complete the 29 full wavelength, with the connection bet~een the tip and connecting body being at or close to the nodal 31 plane. Whether a straight transducer assembly as 32 illustrated in the prior art apparatus of Fig. 1 or the 33 angled assembly shown in Figs. 2-6, the transducer is 34 designed to vibrate at a predetermined resonant fre-quency when a properly designed operative tip is 36 attached to the connecting body.

l In order to enable a particular operative tip to 2 resonate along its longitudinal axis al: the same fre-3 quency whether mounted on a transducer assembly inclu-4 ding a straight or an angled connecting body, the transducers must be impedance matched l:o the tip at the 6 desired or designed frequency for the l:ip. In prac-7 tice, for a tip designed to resonate at a frequency ~, 8 there is a window of frequencies extending above and 9 below the designed frequenc~ in which the assembly will successfull~ operate. This window of frequencies may ll be stated as 2 ~ F, or F Fo~ ~ F, and thus the 12 ultrasonic generator, or driving unit, is designed to 13 drive the transducer at frequencies within the window 14 Fo* Q F-If an angled transducer connecting element is 16 constructed by,~in effect, bending the straight con-17 necting body, and if the operative tip resonates at a 18 frequency F with a straight transducer, the tip mounted l9 on the angled connecting body will operate at a dif-ferent frequency F', and the change in freguencies is 21 the same as if the straight connecting body were made 22 shorter.
23 Referring to Fig. 6 the longitudinal central axis 24 X of a straight transducer and the longitudinal axis X' of the angled portion 76 of a transducer in accordance 26 with the present invention are superimposed, with axis 27 X' intersecting axis X at point C and being disposed at 28 an angle ~ with respect thereto. Note that the end of 29 the connecting end straight member 18 is connected to the transducer 16 at the second antinodal plane, the 31 first antinodal plane being at the opposite or rear end 32 of the transducer element 16. A first nodal plane is 33 located intermediate the first and second antinodal 34 planes at approximately the midpoint of the magneto-strictive transducer elemen~, and the second nodal 36 plane is adjacent the end of the connecting body~

1 As shown in Fig. 6, the superimposed longitudinal 2 central axes of the straight connecting body 18 and the 3 angled connecting body 72 are located at the first 4 antinodal plane indicated at point A. In accordance with the present invention, the connecting body of the 6 angled handpiece is made to resonate along the axis X' 7 which extends at an angle ~ to the axis X of the 8 straighk handpiece, with both ~ransducers being 9 designed to use the same operative tip. If the central longitudinal axis of the straight and angled connecting 11 bodies are the same length, the straight transducer 12 assembly will resonate at a frequency F, while the 13 angled transducer assembly will resonate at a frequency 14 F'. The frequency F' corresponds to the frequency of a shorter straight connecting body.
16 In Fig. 6, AB represents the overall length of the 17 straight connecting member and AD represents the dis-18 tance from the antinodal plane at A,~to the nodal plane 19 adjacent the free end of the straight connecting member. Point C represents the point of intersection 21 of axes X and X', and point E represent the end of the 22 angled connecting member along axis X'. From the draw-23 ings, it is seen that AB = AC + CE x cos ~ = AC + AD.
24 Thus, the effective length AD of the angled connecting member is less than the length AB of the straight con-26 necting member, and the natural frequency F' of the 27 angled connecting member is therefore greater than the 28 frequency of the straight connecting member.
29 As is known, the vibrating acoustic elements of ultrasonic surgical handpieces are usually supported at 31 or close to the nodal plane to minimize the power dis-32 sipation. If the mechanical design is such as to pro-33 vide an acoustic assembly vibrating at a resonant fre-3~ quency F, and this frequency is changed, the location of the nodal points are also changed with a consequent 36 increase in power dissipation and drop in efficiency.

2~

1 However, as previously s~a~ed, systems of this type 2 generally are designed to operate within a narrow 3 window of frequencies extendin~ above and below the 4 optimized frequency Fo~ i.e., an acceptable operating frequency F = optimum Fo ~ ~ F. Within this window of 6 frequencies, efficiency remains substantially constant 7 for practicable purposes but outside the window, sta-8 bility of the driving generator is unpredictable.
9 In order to match the frequency of angled and straight connecting bodies to enable both straight and 11 angled handpieces to be used interchangeably with a 12 given system and operative tip, it has been found that 13 the angled transducer can be matched to the tip fre-14 quency F without changing its length ACE in Fig. 6.
This is accomplished in accordance with the present 16 invention by removing a calculated amount of mass of 17 the angled portion 76 of connecting member 72 adjacent 18 the nodal plane, preferably by milling corresponding 19 flats 78, 80 on diametrically opposite surfaces of the connecting body which are otherwise substantially cir-21 cular in cxoss section throughout their length. The 22 flats preferably lie in planes parallel to the plane 23 containing the longitudinal axes of the angles and 24 straight portions of the connecting bodies. The amount of mass and the configuration of the milled portions 26 may be calculated by solving the following equation:

28 a2 29 (pSdx) at2 ax2 31 wherein P = Volume density 32 S = Cross-sectional area 33 (PSdx) = Represents the mass of fraction dx ~ = Displacement 36 Y - Young's modulus 1An exact solution to the above equation is 2 extremely involved and the practical solution requires 3 many approximations to be taken for placing the proper 4 boundary conditions for mass ]oaded vibrating barsO In practice, the solution may be achieved with only a few 6 trial and error attempts, according to the following 7 calculation for approximating the mass to be removed:

M ~ [ 2 ~D4 p] [CB`CB cos ~ ]

11wherein D = Diameter of the connecting body at the 12nodal plane 14P = Volume density of the connecting body 15material 17CB = Length of the angled portion 19 Utilizing this method, an angled connecting body having the same length as a straight connecting body may be 21 designed to resonate along its axis X' at the same 22 frequency as the straight connecting body, with the 23 bend or angle in the connecting body being located at a 24 point intermediate the node and antinode planes. As indicated previously, acoustic vibrators normally are 26 designed straight to the nodal support point to thereby 27 allow direct axial vector forces to be transmitted 28 along the acoustic vibrator and into the amplifying 29 tip. Bending, if employed, of such acoustic vibrators has therefore normally been accomplished at or after 31 the nodal point support as taught in the above-32mentioned Patent No. 3,546,498.
33Bending of an acoustic vibrator behind the support 34 nodal plane (Y-Y) normally results in excessive acous-tic vibrator losses accompanied by a shift in operating 36 frequency of the acoustic assembly.

2~L

1 The losses are due, in large part, to the non-2 axial loading created by the bent portion of the con-3 necting body. The non-axial load creates a force 4 vector which has a radial as well as an axial compo-nent. It is the radial component which is unwanted.
6 The losses can be minimized in the fo:Llowing ways:
7 1. By selecting a lower operating stroke of the 8 operative tip, as long as the selected level is suit-9 able for the surgical procedure desired.
2. By rontrolling the unwanted :Lateral motion 11 of the stack, as long as the control rneans does not 12 interfere with adequate cooling water flow.
13 3O By adjusting the mass impedence of the con-14 necting body as long as the mechanical fits allow a surgically useful shape. Thus, a longfelt need for an 16 instrument enabling the use of ultrasonic surgical 17 handpieces in delicate operations involving operating 18 microscopes has been supplied. In addition, the appa-19 ratus enables the use of existing drive equipment and operative tips whereby operating room personnel can 21 readily interchange the angled handpiece and conven-22 tional straight handpieces without undergoing extensive 23 training or retraining.
24 In a preferred embodiment of the inven~ion illus-trated schematically in Figure 7A and Figure 7B the 26 magnetostrictive transducer 70 is held firmly in a 27 support means located at the nodal plane Z-Z which 28 tightly clamps the laminated transducer 70. In the 29 illustrated embodiment the support means comprises radially inwardly directed projections 84 on the inner 31 wall 86 of the support element 32. The support means 32 includes means for permitting fluid flow therethrough 33 in order to assure an adequate flow of cooling fluid 34 around the transducer 70. In the illustrated embodi-ment the means for permitting fluid flow comprises 36 apertures 88 between the projections 84.

. ~
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1 While a pr~ferred embodiment of the invention has 2 been disclosed and described in detail, it is under-3 stood that the invention is not so limited but rather 4 that it is intended to include all embodiments which would be apparent to one skilled in the art and which 6 come wi~hin the spirit and scope of the invention.

Claims (7)

WHAT IS CLAIMED:
1. In an ultrasonic surgical handpiece for breaking apart and removing tissue from a recessed operative site, the handpiece including a vibration assembly having an elongated straight transducer oper-able to convert high frequency electrical energy to high frequency mechanical vibrations, an elongated connecting body having one end rigidly joined to one end of the elongated transducer, and an elongated straight operative tip removably mounted on the other end of the connecting body, the vibrating assembly having an overall length substantially equal to the length of the longitudinal vibration wave .lambda. when vibrated at the resonant frequency F of the assembly, the vibration wave .lambda. having an antinodal plane adjacent to the joined ends of the transducer and connecting body, and a nodal plane adjacent to the other end of the connecting body, the improvement wherein said con-necting body comprises, a first substantially straight portion having a longitudinal axis coincident with the longitudinal axis X of said transducer and a second substantially straight portion having a longitudinal axis X' extending at an angle .alpha. with respect to axis X, said connecting body having a circular cross section throughout at least a major portion of its length and having a portion of its mass removed from its outer surface at a location adjacent to said nodal plane relative to the mass of a straight connecting body of the same cross-section whereby the resonant frequency of the angled vibrating assembly is substantially iden-tical to the resonant frequency of said vibration assembly having a straight connection of equal length and dimension and having said straight connecting body but without the mass removed from the connecting body.
2. The ultrasonic surgical handpiece defined in Claim 1 wherein the mass removed from said connecting body comprises a pair of substantially parallel flats milled into diametrically opposite sidles of said con-necting body.
3. The ultrasonic surgical handpiece defined in Claim 2 wherein said flats lie in planes parallel to the plane containing axes X and X'.
4. The ultrasonic surgical handpiece defined in Claim 3 wherein the mass removed from said connecting body is determined by the formula:
wherein D = Diameter of the connecting body at the nodal plane ? = Volume density of the connecting body material CB = Length of the angled portion
5. The ultrasonic surgical handpiece defined in Claim 1 wherein said transducer has a nodal plane loca-ted midway between its ends and said handpiece further comprises support means located at said nodal plane of said transducer for supporting said transducer.
6. The ultrasonic surgical handpiece defined in Claim 5 wherein said support means includes means for permitting fluid flow through said support means.
7. The ultrasonic surgical handpiece defined in Claim 6 wherein said support means for said transducer comprises radially inwardly directed projections on a support member surrounding said transducer.
CA000524050A 1985-12-13 1986-11-28 Angulated ultrasonic surgical handpieces and method for their production Expired CA1258021A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US808,573 1985-12-13
US06/808,573 US4634419A (en) 1985-12-13 1985-12-13 Angulated ultrasonic surgical handpieces and method for their production

Publications (1)

Publication Number Publication Date
CA1258021A true CA1258021A (en) 1989-08-01

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CA000524050A Expired CA1258021A (en) 1985-12-13 1986-11-28 Angulated ultrasonic surgical handpieces and method for their production

Country Status (7)

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US (1) US4634419A (en)
EP (1) EP0248844B1 (en)
JP (1) JPS63501845A (en)
CA (1) CA1258021A (en)
DE (1) DE3687459T2 (en)
IL (1) IL80941A (en)
WO (1) WO1987003467A1 (en)

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EP0248844A1 (en) 1987-12-16
JPH0367411B2 (en) 1991-10-22
EP0248844B1 (en) 1993-01-07
IL80941A (en) 1992-01-15
DE3687459D1 (en) 1993-02-18
JPS63501845A (en) 1988-07-28
US4634419A (en) 1987-01-06
EP0248844A4 (en) 1989-03-15
DE3687459T2 (en) 1993-04-29
IL80941A0 (en) 1987-03-31
WO1987003467A1 (en) 1987-06-18

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