US3216442A - Surgical air turbine unit - Google Patents

Description

Nov. 9, 1965 D. ROTH ETAL 3,216,442

SURGICAL AIR TURBINE UNIT Filed May 26. 1961 6 Sheets-Sheet 1 JNVENTORS DAN/EL E0 7%! a! 2085: M4. fi/Au.

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THE/R Am Nov. 9, 1965 D. ROTH ETAL 3,216,442

SURGICAL AIR TURBINE UNIT Filed May 26, 1961 6 Sheets-Sheet 4 JNVE TORS DAN/1. Ea TH @QJEMM HALL 72mm A rraeusv Nov. 9, 1965 D. ROTH ETAL SURGICAL AIR TURBINE UNIT 6 Sheets-Sheet 5 Filed May 26, 1961 IN V Elg 0R5 THE/E A rmeusv Nov. 9, 1965 D. ROTH ETAL.

SURGICAL AIR TURBINE UNIT 6 Sheets-Sheet 6 Filed May 26, 1961 INVEN 0R5 DAM/4 Ear J Roam 77W. ALL 5,

United States Patent C) 3,216,442 SURGICAL AIR TURBINE UNIT Daniel Roth, Pittsburgh, and Robert M. Hall, Rosslyn Farms, Pa; said Both assignor to PflltB-Dllll, Inc., Pittsburgh, Pa., a corporation of Pennsylvania Filed May 26, 1961, Ser. No. 112,864 5 Claims. (Cl. 137-209) This invention relates generally to surgical and dental operating units for driving turbo jet rotary surgical cutters and more particularly to a portable operating unit that is simplified and capable of being autoclavible for surgical use within the operating area of an operating room.

The dental turbo jet drill has opened up an entirely new field in surgery. However, being developed primarily from the dental view point the operating structures are enclosed in large cabinets that may be wheeled around the room but they are not permitted within the operating area as they contain electrically operated valves and other similar controls that are not autoclavible. Again the use of electrically operated cutters and drills is very dangerous in an operating room which frequently contains ether. The explosion hazard is too much of a risk for an operating room.

The dental turbo jet drill has passed beyond the tooth and jaw bone work of oral surgery. It is now finding use to remove or cut away bone in all parts of the body. It is used to cut calcium from the heart valves or on joints, drill holes through rib bones to draw them back together after they have been stretched to operate on the heart which avoids pinching a nerve running along the edge of the rib, for cutting through the skull this fast surgical cutter has many more uses in surgery than in the field of dental surgery and it is to this end that this invention for the control and supply unit is directed.

The principal object of this invention is the provision of a control and supply unit for turbo jet rotary surgical cutters that is fully pneumatic and is not dependent upon any other source of power but compressed gas such as air.

Another object is the provision of a turbo jet rotary surgical cutter control and supply that is portable. This unit can be readily carried by the doctor to the place Where the drill is to be used. It may be used in the home, in the ofiice, in the hospital room. All that it needs is a supply of gas which can be air or oxygen from a bottled source, or the usual piped air found in doctors ofiices, clinics or operating rooms. It is usually in the wall and with the aid of a quick detachable plug the source of supply of pneumatic pressure is available. A small bottle of compressed air may run the turbo jet for three or more hours and it is readily carried as it usually weighs less than twenty pounds.

Another object of this invention is the provision of a control and supply unit for turbo jet rotary surgical cutters that is completely autoclavible. This entails a connection for attachment to a source of pneumatic pressure that ordinarily has a control valve that may be used to turn the turbo jet on or off and actually control the desired speed. Frequently this is all the control that is needed. If on the other hand, one wishes to use a variable pneumatic control operated by the foot then a foot paddle control valve is mounted in the supply line of pneumatic pressure which is operated by the person using the surgical cutter which valve in turn is connected to the supply unit containing a tank and an oil dispenser and which may or may not be used with a direct pneumatic connection. A surgical turbo jet cutter invariably needs liquid to cool the cutter and wash the area clear. Air or gas is also preferably used for the same purpose but need not be supplied. Most turbo jet cutter handpieces have four holes, two on opposite sides of the rotary shank, one on each side for water and gas such as air. These holes or nozzles direct their fluid under m 3,216,442 C Patented Nov. 9, 1965 pressure to the drill, cutter or stone and cover most of the area on which it is used keeping the same visible. Thus the control valve and its hose connections together with the supply unit may be steam autoclaved without injuring the apparatus and permitting this light and compact unit to be in the operating area with the other surgical tools. This complete portable, pneumatic, and autoclavible control and operating unit is simple, economical and readily transportable. It of course, is also readily sterilizable in a gas autoclave but many hospitals will accept only a steam autoclavible apparatus.

The simplicity in providing one unit that is readily transportable is a considerable advancement in the art when one visualizes the dental stationary apparatus for the supply unit of a rotary turbo jet drill.

Another object is the provision of a control that will stop the flow of water from the nozzle in the handpiece immediately upon the valving oif the pneumatic pressure operating the turbo jet surgical cutter. If no control for this feature is provided the water in the tank being under pressure will flow until the chamber pressure is depleted for a short time. It is not objectionable but when handing the tool back to the surgical tray it may still be spitting water. This control is accomplished by placing a bleeding hole in the air line just beyond the check valve and before the air line enters the water chamber or where it enters the water chamber or tank. This bleeding hole can be of fair size such as No. 20 drill, or very small such as the size of a No. 60 drill. If this hole is placed away from the air inlet then it will not function properly as it exhausts the tank pressure. Thus the mere provision of a bleeding hole at the air inlet on the water tank or chamber side of the air supply check valve provides proper control of the flow of water at the turbo jet drill or cutter.

Another object is the provision of a simplified water control. Frequently operators feel that they may need more or less water on the cutter. If the speed is substantially constant the water supply need only be constant and in place of providing a needle valve which complicates the device the water outlet from the water tank or chamber may be controlled by an orifice thus eliminating the needle valve.

Another object is the improvement of the oil distributor control. One form of controlling the oil distribution is by exposing a metallic wick, the other end of which is suspended in an oil reservoir, to a cross flow of air. The air directly crossing the oil chamber impinges on the saturated wick and passes therearound and out the other side. The amount of oil picked up by this air may be controlled by the amount of oil saturated wick exposed. It has been found that the maximum exposure of the wick does not supply too much oil in the air that drives the turbo jet. Thus no control is necessary thereby simplifying the apparatus.

Another object is the provision of a supply unit containing a water chamber and the oil distributor which consists of a head block of metal such as stainless steel or die cast steel which has a distributing passage with a quick joint to connect to the pneumatic supply under pressure. This passage has a lateral connection containing a check valve and leading to one side of the block through a large cylindrical threaded projection that is almost the size of this block. The threaded portion receives one end of a stainless steel cylinder the bore at both ends of which is threaded, one to receive the head block, the other to receive a large plug removable to form a water tank or chamber and to clean or assemble the unit. These threads may be sealed with O-rings. The top of the cylinder has a threaded hole to receive a threaded funnel-shaped filler into which water may be poured. The block has an oil chamber which is closed by a plug at the top and is provided with an exposed wick critical.

suspended in an oil reservoir but sealed from a cross air fiow passage extending from the distributing passage through the oil distributing chamber to a connection for the handpiece. The distributing passage that directly connects through the block the connection for the handpiece. The last passage is from the tank side of the block just off the bottom of the tank directly to the connection for the handpiece. This passage may be con trolled by a fixed orifice or passage size on a valve such as a needle valve the control of which extends to the surface of the block. Thus the cylinder may be dismounted and the block fully opened for cleaning, inspection or replacement of the check valve which is inserted from the tank side of the block. With the pneumatic quick joint connection on one side and the three passage quick joint connection on the other side of the block for the handpiece,

this unit may be steam autoclaved without the lines connected thereto. Only one control, the water needle valve need be exposed but if a fixed orifice is used then there is no need for any controls on this block.

Other objects and advantages of the invention appear hereinafter in the following description and claims.

The accompanying drawings show for the purpose of exemplification without limiting this invention or the claims thereto, certain practical embodiments illustrating the principles of this invention, wherein:

FIG. 1 is a perspective view of an open supply unit 3 comprising this invention with parts broken away.

FIG. 2 is a perspective view of the closed supply unit with a carrying handle and connected to a foot valve control.

FIG. 3 is a view in vertical section of a modified form of supply unit.

FIG. 4 is a view in horizontal section of the supply unit showing the water pressure and air supply.

FIG. 5 is a partial sectional view of the head block showing the water connection.

FIG. 6 is a view in front elevation of the head block showing an oil reservoir window.

FIG. 7 is a plan view of the supply unit comprising this invention having a control valve.

FIG. 8 is a view in vertical section of a head having a water supply valve.

FIG. 9 is a plan view of FIG. 8.

FIG. 10 is a view in front vertical section of FIG. 8.

FIG. 11 is a view in partial vertical section of the supply head showing a fluid control valve.

FIG. 12 is a view partly in section of a handpiece showing the remote fluid actuated valve control.

Referring to FIGS. 1 and 2 the supply unit 1 comprises the casing made in two sections 2 and 3, the bottom section 2 is provided with the bottom plate 4 and the end walls 5 and 6 which are provided with the marginal flanges 7. The top member 3 is a U-shaped metal arranged to have its sides 8 to slip down inside of the flanges 7 and strike the upper surface of the bottom plate 4 and be secured to the flanges 7 for the purpose of holding the top and bottom sections of the housing together. The top housing section 3 is provided with a handle as indicated at 10 that is secured for the purpose of lifting and transporting the supply unit.

As shown in FIG. 1 the supply unit consists of pneumatic inlet connection 11 which is directly connected to the T-member 12 providing three branches. One branch 13 connects with the check valve 14 for delivering gas under pressure such as air passed the check valve 14 and the elbow member 15 and downwardly into the top of the cylindrical tank 16 which provides a chamber for the storage of sterile water or other liquid that may be employed in combination with a rotary turbo jet surgical cutter. Sometimes a saline solution is employed and sometimes anesthetizing solution may be employed. Just before the passage 13 enters the tank 16 a small bleed hole 17 is provided. The size of the hole is not It can be drilled with a number 60 drill or it 4 may be as large as a number 30 drill. However, a 60 drill hole provides an adequate bleed off and is found to work properly. If this bleed off was placed other than in the air supply passage 13 to the tank 16 it will not function as well. The whole purpose of the bleed off hole is to immediately release the air in the sup-ply line 13 passed the valve 14, when the foot valve 18 has been closed to shut off the supply to the inlet connection 11. The air supply being transmitted from a bottle source of air or a permanent air line such as found in a hospital operating room is provided with a quick connector 20 to conduct the air through the tube 21 to the foot valve 18 and by regulating this valve one may regulate the air passage from the line 21 to the line 22 and thence to the air supply connection 11 of the supply unit 1. The air that is conducted through the passage 13 to the water is thus bled from the line to relieve the tank 16 of pressure when the valve 18 is closed. This prevents a dribble of the liquid from the tank at the surgical cutter after valve 18 has been closed.

The tank is filled with water or other suitable liquid by means of the funnel shaped inlet 23 that is secured to an opening in the wall at the top of the tank 16. A suitable cap 24 is threadably mounted on the water inlet funnel member 23 for closing the tank. The top of the housing part 3 is provided with an opening 25 to pass the water inlet funnel member 23. The end wall 2 is likewise provided with an opening such as indicated at 26 to allow the threaded end of the quick coupling member 11 to be inserted or secured to the supply line within the housing.

The water outlet pipe 27 opens in the tank 16 adjacent the bottom thereof, its mouth being raised above the bottom surface so as not to take any water after a specific predetermined depletion of the supply of water in the tank has been withdrawn. This avoids the water line from picking up any foreign matter in the bottom of the tank. The outlet pipe 27 is connected to the elbow 28 which extends through the horizontal section 30 to the valve 31 which is preferably a needle valve to control the flow of water and the vertical section 32 into the distributing block 33. Likewise the passage 34 from the T- member 12 passes through the elbow 35 and the vertical section of line 36 to the block 33. The third passage from the T-member 12 passes directly into the cylindrical oil distributor 37 that has an exposed wick in the center of its chamber and across which the stream of air is required to flow to pass out through the line 38 to the block 33. The oil chamber has an exposed wick 40 preferably of a metal wire mesh material capable of raising oil by capillary attraction from the reservoir 41 in the bottom of the glass bottle 42 at the lower end of the cylindrical oil distributor 37. As shown in FIG. 2 the glass bottle is exposed through the window 43 to determine the depth of oil in the reservoir 41. This reservoir is filled through the capped spout 44. As shown in FIG. 3 the wick 40 extends upwardly through the tube 45 which tube is sealed with the container above the filling spout 44 so that if the supply unit is inverted the oil will not run into the chamber 46 in which the wick is exposed. The plug 47 that encloses the end chamber 46 in the top of the cylindrical oil distributor 37 has an adjustable stop 48 on its under side to engage the top of the wick 40 and limit its upward extension from the tube 45. This wick 40 is provided with a spring on the lower end of the tube which is open into the reservoir 41 to maintain the wick 40 against the stop 48. As shown in FIG. 3 the wick is substantially fully extended which is the preferred position.

Thus the air traveling through the line 38 picks up oil for the purpose of supplying the same to the turbo jet in the handpiece that rotates the surgical cutter.

As shown in FIG. 1 the manifold block 33 has the lines 32, 36 and 38 connected to a conical reducing member 50 the outer end of which is threaded as indicated at 51 to receive a quick coupling member for the purpose of con necting each of the three passages 32, 36 and 38 to a flexible hose for conducting the air with the 'oil, the air alone and the water under pressure to the handpiece. The air with the oil rotating the turbo jet whereas the air and the water function as cooling and cleaning the surface being removed by the surgical cutter. The side 8 of the top housing section 3 has a large hole 52 into which a coupling member may be inserted and the sleeve threaded onto the section 51 for locking the same in place.

This unit as shown may be steam autoclaved together with the lines 21 and 22 and the intermediate foot valve which would permit the supply unit to be within the operating area.

Referring to FIGS. 3 and 4 the modification herein shown of the supply unit is preferably made from stainless steel and includes the head block 53 having passages bored therein. The back of the head block is provided with a cylindrical extension 54 that is threaded as indicated at 55 to receive the threaded end of the stainless steel tube 56 that forms the tank or liquid reservoir. The opposite end of the tube 56 is threaded as indicated at 57 to receive the threaded plug 58 which is provided with a handle for unscrewing the plug from the bore of the tube 56. In the plug 58 and the head 53 annular grooves are provided for receiving the O-rings 59.

When the tube 56 is screwed until it abuts the shoulder on the head block the top of the head block 53 represents the top of the cylinder 56 Which is provided with the threaded opening 60 to receive the threaded funnel shaped liquid inlet 61 closed by the threaded cap member 62.

A handle for purposes of carrying such as indicated at 63 may be welded or threadably secured to the tube as indicated at 64 and in line with the liquid inlet at the top of the tube 56.

As shown in FIG. 4 the air supply inlet 11 is threaded to receive a quick connector from the end of the flexible hose member 22 or a similar hose member that connects directly to the air supply quick joint member 20. The air upon entering from the flexible hose passes into the manifold passage 65 which has a branch 66 leading to the chamber 46 where the air impinges directly on the metal wick 40 that is extending from the tube 45 that passes downwardly to the bottom of the chamber which functions as an oil reservoir. The tube 45 in turn is secured to the plug member 67 which defines the bottom of the chamber 46 and seals the same from the oil reservoir.

After the air impinges on the wick 40 it breaks up and passes therearound picking up oil and is discharged through the horizontal passage 68 which terminates in the vertical passage 69 that is closed at the top of the head 53 by the plug 70 as shown in FIGS. 3 and 5. This oil bearing air then passes downwardly through the passage 69 to the outlet 70' in the hose line connector 71 as shown in FIGS. 3, 4 and 6.

The passage 65 continues to the passage 72 at right angles thereto as shown in FIG. 4 that extends through the threaded plug section 54 and is provided with a larger bore for receiving the check valve 73. The air upon passing the check valve then flows into the top of the chamber formed by the tube 56. As illustrated in FIG. 3 a small bleed line 74 extends from the enlarged bore to the exterior of the block 53 as illustrated in FIG. 7. This is the bleed passage that corresponds with the bleed passage 17 of FIG. 1.

A diagonal passage 75 extends from the manifold 65 downwardly to the opening '76 in the hose line connector 71 as shown in FIGS. 3 and 6.

An upwardly extending diagonal passage 77 connects with the inner lower end of the chamber formed by the tube 56 upwardly and terminates at the opening 78 in the connector 71. As shown in FIG. 3 the line 77 before it connects to the chamber of the tube 56 is provided with a removable orifice. This removable mem- 5 her which has a predetermined orifice will admit only a certain amount of water therethrough at a given time and thus fixes the flow of water to be employed in cooling the surgical cutter. As shown in FIGS. 1 and 8 to 10 this line 77 has the removable predetermined orifice member 79 omitted and in its place is provided a needle valve 80 which is properly sealed within a vertical bore in the block 53 and is provided with a control handle 81 at the top of the block as illustrated in FIGS. 8 and 9. Thus one may regulate the amount of water supplied for cooling the rotary surgical cutter.

Through long usage it has been determined that a single high speed for the turbo jet rotary surgical cutter is ideal for most purposes and the same is true insofar as the supply of air and water for cooling this rotary cutter. Thus the orifice 79 which determines the amount of water admitted for a given pressure together with the size of the air discharge 76 properly limits the supply of the cooling water and air to the handpiece and thus greatly simplfies the structure.

In this structure shown in FIG. 7 a spring loaded valve member is operable to close the manifold passage 65 before it reaches the first branch 66. This valve is shown at 8 2 and is spring loaded to maintain the passage 65 open. A lever 83 is pivotally supported on the pivot member 84 attached to the top of the head 53 allowing the lever to swing out over the valve '82. The outer end of the lever 83 is provided with a bifurcated hook 85 which receives the handpiece member 86 that is connected by the flexible hose '87 to the complementary part 88 of the connector 71. Thus when the handpiece 86 is placed on the hook 85 it will depress the lever 83 and close the valve 8'2 to stop the supply of pneumatic pressure to the manifold '65 and thus arrest the rotation of the turbo jet surgical cutter.

As shown in FIG. 5 the valve '82 is provided with a handpiece and is threadably actuated to manually close the manifold 65.

Referring to FIG. 11 the block 53 is provided with the vertical bore 90 which would receive the valves 82 in the structures shown in FIGS. 5 and 7 but in this case receives the valve 91 which slidably closes the manifold 65. This valve member '91 is connected to the valve operator 92 by means of the rod 93 that extends therebetween and is connected to the same. Above the valve 91 is provided a spring 94 which is seated against the removable-plug 95 and bears against the valve 91 to force the same downwardly until it is stopped by the seat 96 in the bottom of the bore 90. A smaller bore 97 extends down to the horzontal pasage 98 that is parallel and lies directly under the manifold passage 65 and thus proceeds to the center of the block where it is connected by the outwardly extending passage 100 wherein the passage 98 is closed by the plug valve 102 and when the complementary part 88 is attached to the connector 71 each of the four openings 70, 76, 78 and 100 are connected to their associated independent lines in the hose member 87 as shown in FIG. 12 where the opening 70' connects through the line directly to a nozzle to discharge the oil bearing air against the small buckets 103 of the turbo jet rotor 104 to rotate the surgical cutter 105 in the handpiece 86. A series of two holes is placed on each side of the turbo jet as indicated at the locations 106 which direct the cooling air and water to the cutter 105 as indicated by the dotted lines depicting the flow streams.

The handpiece 86 has a window 107 which exposes the bulb 108 that is connected directly to the opening 100. When the handpiece and its connector 88 is secured to the complementary connector 711 all the passages including the bulb 108 and the hose connections extending back to the connector 71 together with the passages 97 and 98 are filled with an actuating fluid such as oil through the plug valve 102. When the hydraulic system is being filled the air may be bled therefrom through an exhaust in the instrument filling the same to insure that the system is completely filled with a hydraulic fluid. The filling device is then removed from the valve plug i102 and the pressure in the system is insuflicient to lift the valve operator 9 2 off its seat 96. However, when one depresses the bulb 108 in the handpiece the valve 91 is raised compressing the spring 94 and thereby opening the manifold v65 to allow the pneumatic pressure to enter the same. This of course immediately starts the turbo jet and the supply of the cooling air and water from the four jet openings which direct their respective sprays to the surgical cutter 105. Thus the surgical cutter will continue to rotate and be supplied with air and water as long as the operator depresses the bulb 108 in the handpiece. However, releasing the bulb 108 the pressure of the spring 94 pushes the valve 91 close-d and the operating piston 92 then returns the liquid to the system and thus stops the rotation of the turbo jet surgical cutter and also stops the flow of air and water. The bleeder passage 74 shown in FIG. 3 allowing the entrapped air to immediately escape from the chamber formed by the cylinder 56 causes the water to immediately stop from issuing in the nozzle directed to the rotary surgical cutter. Any leakage of air past the valve 91 will be vented through the vent '109 as shown in FIG. 11.

If it is desired not to employ the chamber 46 as the oil distributor then a glass type oil distributor such as illustrated at 42 in FIG. 6 may be employed which has an upper metal member 37 that is provided with the chamber which contains the tube 45 with the projecting wick 40 and is also provided with a filling spout 44. The metal member 37 is provided with a pair of O-rings such as illustrated at 5110 which seal off the connection between the passages 66 and 68 to the bore in the head 53 that receives the bottle 42. As illustrated in FIG. 6 the face of the head 53 is slotted as indicated at 11 1 to expose the bottle so that the depth of the oil in the reservoir 41 thereof may be visually checked. The slot 111 also permits this filling spout 44 to be slid downwardly in place. Thus the oil reservoir in this instance may be removed entirely from the block, whereas in the structure shown in FIGS. 3 and 4 merely the interior of the oil reservoir structure and wick is removable and sealed within the bore.

We claim:

1. A portable compact autoclavible unit for supplying operating fluid under pressure to a handpiece having a rotary turbojet surgical cutter, consisting of a unit, a pneumatic pressure inlet connection to said unit, a supply line attached to said inlet connection, valve means in said supply line to control fluid under pressure to said inlet connection, an output supply connection on said unit and including a plurality of independent fluid supply lines, a refillable oiler in said unit having a closed chamber containing an oil distributor, a passage from said inlet connection to said oil chamber, an outlet from said oil chamber to one of said independent supply lines as the first of said supply lines for said output supply connection, a liquid supply tank in said unit having a removable closure to fill the same, a tank pressure inlet above the tank liquid level and having a check valve, a second passage from said inlet connection to said tank inlet through said check valve, a constantly open atmosphere bleeding orifice connected between said tank pressure inlet and said check valve, a control tank outlet below the liquid level of said tank to said output supply connection as the second of said independent supply lines of said outlet supply connection to supply cooling liquid, and a third passage from said inlet connection directly to said outlet supply connection as the third of said independent supply lines of said output supply connection to supply cooling air.

2. The portable compact autoclavible supply unit of claim 1 which also includes a cylinder for said tank, a block manifold connected with said cylinder for said inlet and outlet supply connections to retain each of the passages therefor, plug means carried by said cylinder for closing said cylinder making it a pressure vessel, said removable closure to fill said tank carried by said cylinder.

3. The portable compact autoclavible supply unit of claim 1 which also includes a cylinder for said tank, a block manifold closing one end of said cylinder and containing said inlet and output supply connections and all of said passages, plug means closing the other end of said cylinder.

4. A portable compact autoclavible unit for supplying operating fluid under pressure to the fluid actuated rotary turbo surgical cutter, consisting of, a unit having a supply inlet for receiving gas under pressure, valve means in said unit to control the supply of gas to said supply inlet, a refillable liquid chamber in said unit having a fluid pressure inlet with a check valve and connected to said supply inlet, a continuously open atmospheric bleeding orifice connected between said chamber and said check valve in said chamber fluid pressure inlet, a chamber outlet of predetermined size from adjacent the bottom of said chamber to supply liquid under pressure as a cooling liquid, an oil distributor in said unit connected with said supply inlet to supply gas carry ing oil as a turbo operating fluid, and a direct connection from said supply inlet to supply gas as a cooling fluid.

5. The portable compact autoclavible supply unit of claim 4 which also includes valve controlling means and a control line therefor connected to said valve means to actuate the same and control the supply of gas to said supply inlet in said unit.

References Cited by the Examiner UNITED STATES PATENTS 1,822,743 9/31 Mitchell 239348 2,243,435 5/41 Mott 239347 2,439,910 4/48 Snyder l84-55 2,764,177 9/56 Paasche 137-209 2,850,323 9/58 Veres 184-55 XR 2,868,584 1/59 Faust.

2,878,895 3/59 Wiley 184-65 2,895,684 7/59 Harr 239549 XR 2,924,880 2/60 Ziegler 3228 2,991,944 7/61 Sullivan 239422 XR FOREIGN PATENTS 849,324 9/ 60 Great Britain.

WILLIAM F. ODEA, Primary Examiner.

ISADOR WEIL, M. CARY NELSON, ROBERT E.

MORGAN, Examiners.

Claims (1)

1. 4. A PORTABLE COMPACT AUTOCLAVIBLE UNIT FOR SUPPLYING OPERATING FLUID UNDER PRESSURE TO THE FLUID ACTUATED ROTARY TURBO SURGICAL CUTTER, CONSISTING OF, A UNIT HAVING A SUPPLY INLET FOR RECEIVING GAS UNDER PRESSURE, VALVE MEANS IN SAID UNIT TO CONTROL THE SUPPLY OF GAS TO SAID SUPPLY INLET, A REFILLABLE LIQUID CHAMBER IN SAID UNIT HAVING A FLUID PRESSURE INLET WITH A CHECK VALVE AND CONNECTED TO SAID SUPPLY INLET, A CONTINUOUSLY OPEN ATMOSPHERIC BLEEDING ORIFICE CONNECTED BETWEEN SAID CHAMBER AND SAID CHECK VALVE IN SAID CHAMBER FLUID PRESSURE INLET, A CHAMBER OUTLET OF PREDETERMINED SIZE FROM ADJACENT THE BOTTOM OF SAID CHAMBER TO SUPPLY LIQUID UNDER PRESSURE AS A COOLING LIQUID, AN OIL DISTRIBUTOR ON SAID UNIT CONNECTED WITH SAID SUPPLY INLET TO SUPPLY GAS CARRYING OIL AS A TURBO OPERATING FLUID, AND A DIRECT CONNECTION FROM SAID SUPPLY INLET TO SUPPLY GAS AS A COOLING FLUID.

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