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Publication numberUS436804 A
Publication typeGrant
Publication dateSep 23, 1890
Filing dateDec 4, 1889
Publication numberUS 436804 A, US 436804A, US-A-436804, US436804 A, US436804A
InventorsMilton Josiah Roberts
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 436804 A
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Description  (OCR text may contain errors)

(NdMod eL) 4 Sheets-Sheet 1. M. J. ROBERTS. ELEOTRO OSTEOTOME.

No. 436,804. Patented, Sept. 23, 1890.

wi nesses. izverz ar.


(No Model.)

Patented Sept. 23, 1890.

(No Model.)


No. 436,804. Patented Sept. 23, 1890.




I SPECIFICATION forming part of Letters Patent No. 438,804, dated September 23, 1890.

Application filed Ibecemher 4, 1889. Serial 11m 332,598. (No model.) i

.To all whom it may concern:

Be it known that I, MILTON JOSIAH Ron- ERTS, a citizen of the United States, and a resident otNew York, county and State of New York, have invented. certain new and useful Improvements in Electro-Osteotomes, of which the following is a specification.

The object of myinvention is to supply means by which operations in bone surgery maybe quickly and efficiently performed.

As the apparatus devised by me to carry out the objeet of my invention is actuated by means of electricity, 1 have designated it the electro-osteotome.

By the use of the improved apparatus hereinafter described any operation in bone surgery can be rapidly,smoothly, and with positive certainty performed in a fraction of the time heretofore ,required for such work, the construction of my electro osteotome being such that the operators attention and strength are directed solely to guiding and controlling the instruments.

To particularize, my invention embraces an electromotor embodying new features of constructions,which enable the operator to firmly grasp the instrument and control its opera tion. These consist of, first, a suitably-formed hand-piece secured to one end of the motor, throughwhich the shaft of the. armature passes, thus imparting motion to the various tools held in special tool-holders attached to the end of the hand-piece; second, a lever connected to a switch in the motor and projecting from the body thereof in close proximity to the hand-piece and'arranged to be actuated by thethumb of the hand which grasps said hand-piece, by the manipulation of which the motor-circuit may be opened and closed, as desired; third, a lever located under the forefinger of the hand and connected to a brake-shoe opposed to a disk on the armature-shaft, by the manipulation .of which the speed of the motor can be regulated or its motion instantly arrested. I have also devised anadjustable crane, from which.

the motor is suspended by moans of an elastic cord supporting it in convenient position I over the operating-table, the elasticity of which permits the motor to be moved freely into any desired operative position.

The invention further embraces a variety Figure 1, Sheet 1, is a perspective view of my improved electro-osteotome and supporting-crane in operative position. Fig. 2, Sheet 2, is a side elevation of the electromotor with an oscillating saw attached, partly in section. Fig. 3, Sheet 2, is an end view of the motor with the instrument removed. Fig. 4., Sheet 2, is a transverse section on the line :10 17, Fig.

2. Fig. 5, Sheet 2, is a longitudinal section onthe line 3 y, Fig. 2. v Fig. 6, Sheet 3, shows a modification in the hand-piece of the motor. Fig. 7, Sheet 3, represents the parts of the supporting-crane detached and folded for transportation. Fig. 8, Sheet 4, is a longitudinal central section of a reciprocatingtool holder and saw attached thereto. Fig. 9, Sheet 4, is a transverse section of the same on the line's .2, Fig. 8. Fig. 10, Sheet 4, is a side elevation of a bow-saw. Fig. 11, Sheet 4, is a front' view of a circular-saw holder. Sheet 4, is a side elevation of the same. Fig. 13, Sheet 4, is a central section on the line 2' 2', Fig. 11. Fig. 14, Sheet 4, is a central section of a chuck holding a crown or cylindrical saw. Fig. 15', Sheet 4, is an end view of the same. Fig. 16, Sheet 4, is a side elevation of a trephine; and Fig. 17, Sheet 4, is an end view of the same. In Fig. 1, (2 represents the electro magnetic motor in position for use suspended by the-spiral spring 1) from the crane which is clamped to the edge of the operating-table c. The electric conductors d d, guided in eyes on the upper end of the crane, pass down through the spring I) and are clamped in the binding-posts a a? of the motor, thereby completing the circuit of the motor with the source of electricity connected to the other Fig. 12,

ends of the conductors d (1. Another pair of with a switch is clearly shown at Fig.1, the handle a being grasped by one of the hands, (represented by dotted lines,) and the end of the handle or toolholder attached thereto being controlled and guided by the thumb and forefinger of the other band, (also shown by dotted lines.) The whole weight of the motor is sustained by the supporting-spring b, which permits it to be moved into any desired position without exertion on the part of, the operator,-his whole energies being directed to the guidance of the cutting-tool actuated by the motor.

Several devices are employed to connect a variety of bone cutting and drilling tools to the motor, and in Fig. 1 is shown a circular saw arranged to rotate in a plane parallel to the axis'of the motor-shaft and adapted to perform simple, cuneiform, and longitudinal osteotomes.

Means are provided for giving the operator perfect control over the motor without releasing his hold thereon-via, the switch-lever), projecting from the end of the motor and conveniently located under the thumb of the hand, by a simple movement of which the motor-circuit can be opened. and closed atpleasure, and the brake-lever g,-located under the forefinger of the hand, by the manipula- 'tion of which the speedofthe motor may be regulated to a nicetyor its motion instantly arrested.

The stem of the electric lamp e fits into a hole in the motor-frame and is readily detached therefrom, it being only required when the part operated upon is insufiiciently lighted from other sources, a reflector being used to direct its light thereon, and it is provided c for opening and closing its circuit. t

All of the conducting-wires d d e e, as before stated, pass down the interior of the spring I), thus avoiding as much as possible.

all chances of entanglement and obstructions to the speedy and effective use of the instrument. Any arrangement of these wires may be made by which these objects are attained.

The crane is composed of several pieces so I constructed as to occupy but little space when taken apart, as shown at Fig. 7,Sheet 3, which are securely connected together and form a rigid supportfor the instrument, as shown at Fig. 1. It consists of the inferior piece h, pro vided with a clamping device h at its lower end and a bayonet-slot at its upper end, a middle piece 7L2, having a plug and pin at one end adapted to fitinto the upper end and bayonetslot of the inferior piece It and at its other end a bayonet-slot, a superior piece h, having a. plug 'andpin at its lower end adapted to lit into theend andbayonct-slot of the middle piece h and a swiveling piece h" at its upper end, an arm h, pivoted to thesw'iveling piece It and provided with an eye at its. free end, to which the suspnsioli spring b is attached, a brace h,piv o'ted to a sleeve on the arm h, adapted to be clamped thereto and to a swiveling sleeve 7: onthc superior piece h, and a hook h, pivoted to the piece h on which the By the construction of'the upper part of the crane the arm h and attached parts may be raised and lowered intoany position desired. The details of the eleetromotor are shown in Figs. 2 to 5, Sheet 2. The cylindrical fieldmagnet a with theyplates a and a, secured to the ends of the pole-pieces of the magnet, constitute the frame of the motor. The shaft 1' of the armature '17 rotates in bearingsinthe plates a and a, the front bearing consisting of the piece i secured to the sleeve 2?, which is fastened to plate a", and on which is sooured the handle a 5 0n the end of the shaft z' in the sleeve i is secured one half of the clutchcoupling 'i, the other half of which is secured to 'or forms a part of the shaft of the tool-holder held in the-end of the sleeve 1' by means of the thumb-screw 11 passing through the sleeve with its end set into one of a series of depressions made in the shank of the tool-holder. By this means the tool holders are rigidly connected to the motor, and may be set in any desired'position relatively thereto. One of the brushes j of the commutator is connected with the bindingpost a. and the other brush j to one end of the field-magnet wire, the outer end of which is connected to the binding-post a. This field-magnet wire at the other endof the motor is broken, one part being joined to the fixed plate f and the other to the spring f,

which when in its normal-condition is away .from the plate f. To close this motor-circuit, an arm f located inside the motor, is arranged to act on the spring f 2 and is connected to the thumb-piece f, before dcscribed,which is in close proximity to the handle a; The thumb-piecef is held away from the handle a. by the spring f bearing against the tail'of the arm f, and the movements of the arm f and thumb-piece f are limited by'means of v the adjustable stop f-". The brake-lever g is secured to the shoe g, arranged inside the motor so as to bear on the periphery of the disk 9 secured to thearmature-shaft i. This shoe g' is normally held away from the disk g by means of the spring g".

The tool shown attached to the motorin the views, Figs. 2 to 5, comprises a sectional saw 1-, projecting from the end of the conicalcnsc or holder is and havingimpartcd to it an oscillating motion; The means employed for converting the continuous rotary motion of the motor-shaft time the oscillating motion consists of the spherical crank-pin k on the disk It, secured to the short shaft k", which is connected to the motor-shaftby the-clutcheoupling if, the split .jaw It, pivoted in the end of the conical case L by the thumb-screw and nut k9, which also clamps the crank of the sawkin the jaw k, and'thebark', hinged at one endto the pivoted jaw i and havimgv at its other end a cylinder-hole fitting over transfer-shaft n the spherical crank-pin k As the crank-pin k rotates the attached end of the bar k is carried around with it, the other end of the bar being held in line with the axis of the crank-shaft h, but free to move in one direction' by its hinged connection to the jaw 10 The jaw, with the saw held therein, is oscillated on the thumb-screw and nut A reciprocating device for holding straight saws adapted to be used in making cross-cuts and other straight cuts is shown at Figs. 8

and 9, and consists of a cylinder-body Z, in.

which is fitted to rotate a central shaft 1, provided with a part of the clutch-coupling i and carrying the peripheral cam 1*. The forward end of this shaft Z rotates in the sleeve Z which is fitted to reciprocate in the front bearing of the body Z, and is provided with an arm Z extending over the cam Z a pin on the arm fitting therein. A screw-stud Z passing through the body, fits into a longitudinal slot formed in the arm Z thereby preventing it from rotating with the arm Z The front end of the sleeve Z is slotted in such a manner as to leave a central web, the straight saw 1 being clamped therein by the screw Z as shown in Fig. 8. This holder is adapted to hold the bow-saw 1 Fig. 10-, and other instruments re-' quiring a reciprocating movement.

The construction of the holder for operating circular saws in a plane parallel to the axis of the motor-shaft, by which similar cuneiform and longitudinal osteotomes may be performed, is given in Figs. 11, 12, and 13. The body an fits into the sleeve i and is held therein by the screw i The depressions m in the shank of the bodym,in which the end of the screw 41 fits and'by which the two may be held in any desired position relatively to themotor, are clearly shown in Figs. 11 and 12. In bearin s in the body m is fitted to rotate the central shaft n, provided with apart of the clutch-coupling i, by which it is con nected to the armature-shaft 11, and has secured toits other end the miter-gear 'n',which me'shes into the miter-gear n secured to the The hub of this miter-gear n projects from the side of the body an and has flat surfaces formed on it, as clearly shown at Fig. 11, the object of which will be hereinafter explained. The projecting end of-the shaft 92 is provided with a screw-thread, on which is fittedthe hub of the circular saw n. In a dovetailed slot formed in the body is fitted the shankof the guard o,which is shaped,

as shown, so as tocover the central shaftand the periphery of the circular saw a. The shank of the guard '0 and the slot in which it fits are so made that the guard can only be removed from the body m by sliding it forward toward the front end of the body, and

- when it has been placed in position and the saw m fixed'on the shaft n it is prevented from moving forward by means of the looking device 0, formed of sheet metal to closely inclose the body and havingadovetailed projection arranged to fit into the longitudinal dovetailed slot 0 formed in the body. This locking device is firmly clamped in position by means of the thumb-screw 0 The front end of the locking device 0' has an opening 0, which when the device is slidin g forward embraces the flat sides of thehead of the miter-gear n and acts as a wrench to hold the shaft 72 stationary while the saw is. being screwed on or removed from the shaft. By this construction it is evident that saws and guard-plates of different sizes may be attached to and removed from the holder with facility, which is very essential with this class of instrument, as it is often necessary to change the cutting-tool in the middle of an operation;

A clutch adapted to hold common and hollow drills, trephines, circular saws, andother rotating tools is shown at Figs. 14 and 15. It is formed to fit into the sleeve 2' of the motor, and base. central shaft p passing through the body p, and connected to the shaft 72 by the clutch-coupling 2'. The front end of the shaft p is provided with ordinary screw-clamp jaws p for holding the shank of the tool placed therein, which in the drawings is represented as a hollow or cylindrical drill q.

adapted to be held by the screw-clamping jaws 19 It is provided with a cylindrical gage r, clamped thereon by the screw'r and by means of which the depth of the cut is determined.

Instead. of the various tool-holders being attached to the end of the hand-piece a of, the motor, their body portions may be .enlarged so as to constitute hand-pieces, the electromotor being attached directly thereto. This modification is shown at Fig. 6 applied to an ordinary chuck s for holding drills and other rotating tools, whose shaft 8 is pro vided with one shaft of the clutch-coupling z" for connection to the motor-shaft 2", as in all of the other previously-described. devices. The bearing of the end plate a of the motor is prolonged and fits into the end of the handpiece, which is firmly held therein by the thumb-screw t passing through the flange 15 extending from the end plate a? and bearing against the hand-piece or into one of a series of depressions'formed therein.

The rear end of the inotor-shaft'iis provided with a knob or milled hold u, by means of which the shaft is held or rotated when .de-

sired. i V

, The motor is entirely surrounded hyalight casing'o. to cover'up and protect all of the working parts.

Having thus described my invention, what I claim, and desire to secure by Letters Patcut, isa 1. In combination, an electric motor, a handle or hand-piece in substantially the same axial line as the motor at the one end thereof,

by which the motor is held and controlled, an

The trephine r, Figs. 11 and 12, for remov- 5 mg circular pieces of bone, has a shank pass longitudinaglly through said handle for operating the tool to be worked, and a circuit opening and closing switch connected with the 'motoroutside of the handle and to one side of it for operation by a digit of the hand which grasps the handle, substantially as set forth.

2. In combination, an electromotor, ahandpiece connected thereto, by which the motor is held and controlled, a crank-lever located over the hand-piece, and a brake-shoe connected thereto arranged to act onthe motorshaft and retard the speed of the same when the lever .is depressed by one of the digits of the hand grasping the hand-piece.

3. In combination, an electromotor, a handpiece connected thereto, by which the motor is held and controlled, a switch-lever located over the hand-piece in position to be oper ated by the thumb of the hand grasping the hand-piece to open and close the motor-circuit, a brake-lever, alsoloeated over the handpiece in position to'be operated by the forefinger of the hand, and a brake-shoe connected to the brake-lever arranged to act on and retard the speed of the motor-shaft when its lever is depressed.

4. In an electro-osteotome, in combination, an electro motor, a 'hand -piece projecting from one end thereof, in which the armatureshaft rotates, a detachable tool-holder adjustably attached to the end of the hand-piece, a shaftin the tool-holder connected to' or actuating the tool held thereby and provided with a clutch-coupling connecting it to the motorshaft, substantially as set forth.

5. In an electric osteotome,in' combination, an electric motor, a hand-piece at one end of the motor, an armature or motor rotating shaft arranged to pass through said handpiece, a detachable tool-holder, and an adj ustable supporting-crane and an elastic suspension cord or'spring by which the motor is suspended from the crane, substantially as set forth. i

6. In an electro-ost-eotome, in combination,

an electromotor provided with a hand-piece and a detachable tool-holder, an adjustable supportingeeranc, a hollow elastic suspension cord or spring, and electric conductors connected to the motor passing through the suspension cord or spring and guide-eyes on the I upper part of the crane, substantially as set forth. v

7. In an eleetro-osteotome, in combination, an electromotor,, a hand piece projecting fromone end thereof, in which the armature shaft rotates, a detachable tool-holder adj ust ably attached to'the end of the hand-piece, a shaft in the tool-holder connected by a coup ling to the armatureshaft and provided with a crank, a split tool-clamping jaw pivoted in the end of the tool-holder, and a bar hinged to the inner end of the pivoted jaw end held and controlled at its other end by the crankpin, substantially as set forth.

8. In an electro-ostcotome, in combination, an electromotor, a. hand piece projecting from one end thereof, the armature shaft of the motor passing through the hand-piece and provided with a clutch at its end, a toolholder having a shank fitting in the end of the hand-piece, ashaft in the tool-holder provided at its end with the counterpart of the clutch on the armature-shaft, and a screw passing through the hand-piece and fitting into one of a'series of depressions in the shank of the tool-holder to clamp it firmly in 10. In an electro-osteotome, in combination the electromot'or comprising'the armature i and field-magnet a, the armature-shaft 'i, the

. disk 9, secured thereon,;the'plate or head. a,

the brake-lever g and brake g, pivoted therein, and the spring 9, substantially as set forth.

11. In an electro-osteotome, in combination,

therein, thedi'sk k, secured on-the'end of the shaft 10, the spherical crank-pin k", projecting from the disk, the split jaw k pivoted to the holder k, the connecting-bar k hinged to the jaw k and fitted over the spherical crank-pin the ease or cylinder k, the shaft k, rotating h the sectional saw k, and the thumb-screw and nut 7. forming the pivot for the jawand clamping the saw-spring, substantially as set forth.

12. In an elcctro-osteotome, an elcctromotor-provided with a hand-piece and a detachable tool-holder, an electric light attached to the motor, an adjustable supporting-crane,

and an elastic suspension. cord or spring by the crane which the motor is suspended from substantially as setforth.

The foregoing specification of my new and 1mproved electric osteotome signed by methis 13th day of November, 1889, in the,presence of the below-subscribed witnesses.




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US2427580 *Apr 2, 1945Sep 16, 1947Stryker Homer HPlaster cast cutter
US2457829 *Jun 3, 1944Jan 4, 1949Miller Charles DPower driven hand racksaw
US2492156 *Jul 29, 1946Dec 27, 1949Kupjack Eugene JHand manipulable motorized saw for cutting plaster casts
US2547707 *Jan 15, 1947Apr 3, 1951Singer Mfg CoSurgical sawing instrument
US3554197 *Jul 22, 1968Jan 12, 1971Desoutter Brothers LtdPortable power-operated saw
US5160340 *Dec 14, 1990Nov 3, 1992Gary James AAutopsy apparatus
US5237884 *Apr 21, 1992Aug 24, 1993Osada Research Institute, Ltd.Power transmission device
US5263972 *Dec 11, 1992Nov 23, 1993Stryker CorporationSurgical handpiece chuck and blade
US5439472 *Jul 14, 1993Aug 8, 1995Stryker CorporationSurgical handpiece chuck and blade
US5468247 *Oct 19, 1994Nov 21, 1995Stryker CorporationSaw blade for powered medical handpiece
US5702415 *Sep 8, 1995Dec 30, 1997Stryker CorporationChuck and blade for powered medical handpiece
US20040187318 *Oct 28, 2003Sep 30, 2004Acme United CorporationRotary trimmer
DE940145C *Apr 1, 1949Mar 8, 1956Mey Kg Maschf MafellElektrische Handhobelmaschine
DE967413C *Oct 2, 1948Nov 7, 1957Festo Maschf Stoll GElektromotorisch angetriebene Handkreissaege
WO1994009707A1 *Nov 2, 1992May 11, 1994James A GaryAutopsy apparatus
Cooperative ClassificationA61B17/14