|Número de publicación||US3867932 A|
|Tipo de publicación||Concesión|
|Fecha de publicación||25 Feb 1975|
|Fecha de presentación||18 Ene 1974|
|Fecha de prioridad||18 Ene 1974|
|Número de publicación||US 3867932 A, US 3867932A, US-A-3867932, US3867932 A, US3867932A|
|Inventores||Huene Donald R|
|Cesionario original||Huene Donald R|
|Exportar cita||BiBTeX, EndNote, RefMan|
|Citas de patentes (1), Citada por (192), Clasificaciones (13)|
|Enlaces externos: USPTO, Cesión de USPTO, Espacenet|
Sttes Patent [191 51 Feb. 25, 1975 ASSEMBLY FOR INSERTING RIGID SHAFTS INTO FRACTURED BONES  Inventor: Donald R. Huene, 6540 N.
Roosevelt, Fresno, Calif. 93704  Filed: Jan. 18, 1974  Appl. No.: 434,423
 U. S. Cl. 128/92 E, 128/92 EB  Int. Cl. Afilf 5/04  Field of Search 128/92 E, 92 EA, 92 EB,
128/92 EC, 92 R, 83
 References Cited 7 UNITED STATES PATENTS 3,727,611 4/1973 Schultz 128/92 EB FOREIGN PATENTS 0R APPLICATIONS 186,084 10/1966 U.S.S.R 128/92 EB 551,446 l/l958 Canada 128/92 EA OTHER PUBLICATIONS Key Dual Bone Plate Outfit, Zimmer Fracture Catalogue, Feb. 1, 1947, p. 32.
Primary Examiner-Richard A. Gaudet Assistant Examiner-J. Yasko Attorney, Agent, or Firm-Huebn.er & Worrel  ABSTRACT An improved assembly for use in techniques wherein substantially rigid shafts are employed for joining upposed segments of a fractured bone. including a clamp characterized by an elongated body of a generally shape configuration having a fixed jaw projected later ally from one end thereof, for engaging a fractured bone at a first surface, a bearing sleeve affixed to the opposite end of the body, a movable jaw of a tubular configuration adapted to be fixed within said bearing sleeve in opposed relation with the fixed jaw for engaging the fractured bone at a second surface opposed to said first surface and manually operable means adapted to be received telescopically by the movable jaw and employed for inserting a shaft into the bone.
12 Claims, 9 Drawing Figures PATENTEU F532 519? sum 2 or 2 ASSEMBLY FOR INSERTING RIGID SHAFTS INTO FRACTURED BONES BACKGROUND OF THE INVENTION segments great care must be taken in order to avoid in flicting serious injury on healthy tissue in the vicinity of a bone being repaired. For example, blood vessels and the like frequently are found in juxtaposition with a bone to be repaired. This imposes on an operating surgeon the added burden of avoiding a puncturing of the blood vessel, as may occur when drilling a screwreceiving opening through the fractured bone or forcibly inserting a shaft into the bone segments. Of course, it also is imperative that proper alignment of the shaft be maintained in order to assure that the shaft is properly positioned for joining the opposed segments of the fractured bone.
The prior art includes numerous devices suggested for use in aligning drills, pins, wires and the like, during orthopedic operations. However, none of the devices heretofore provided includes a stop for limiting the depth to which a shaft may be inserted into a bone, for thus protecting tissue immediately adjacent to the bone. Moreover, the majority of the devices hertofore provided for use in forming openings within fractured bones are bulky, complex and often are simply impractical to 'employ. Additionally, difficulty in achieving proper alignment often is encountered when inserting a drill or a pin, wire or the like without the benefit of a previously formed pilot hole or an opening of a similar nature.
It is therefore the general purpose of the instant in-.
OBJECTS AND SUMMARY OF THE INVENTION It is therefore an object of the instant invention to I provide in an assembly for joining opposed segments of a fractured bone an improved clamp for securing the segments in a contiguous relationship.
It is another object to provide in an assembly for joining opposed segments of a fractured bone the improvement comprising a clamp for engaging a fractured bone at the opposite sides thereof and means for inserting a shaft, either threaded or unthreaded, into the bone without subjecting adjacent tissue to puncture inflicted damage.
It is another object to provide in an assembly forjoining opposed segments of a fractured bone the improvement which includes a clamp, and means mounted on the clamp for facilitating the preparation of a screwreceiving opening in the bone.
It is another object to provide in an assembly forjoining opposed segments of a fractured bone a clamp including an elongated body of a C-shape configuration having a fixed jaw and an axially movable jaw of a tubu' lar configuration for aligning and guiding tools employed in inserting shafts, both threaded and unthreaded into the bone, and stop means mounted for limiting axial motion imparted to the tools for avoiding misalignment of the shafts and injury to contiguous tissue.
These and other objects and advantages are achieved through an assembly which includes a clamp of a C- shape configuration and having a fixed jaw anda movable jaw of a tubular configuration. In a first embodiment, the movable jaw is adapted to receive, in turn, a centering tool for forming a centering bore, a pilot drill for forming a pilot bore in the bone, a drill for enlarging the pilot bore, a tap threading the enlarged bore, and a screwdriver for advancing a screw into the bone. In a second embodiment, the movable jaw includes a bushing and a driver for inserting a Kirschner Wire, threaded or unthreaded, or Steinman Pin into a bone. as will hereinafter become more readily apparent by reference to the following description and claims in light of the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an assembly embodying the principles of the instant invention.
FIG. 2 is an exploded perspective view of a clamp included within the assembly shown in FIG. 1.
FIG. 3 is a partially sectioned view illustrating a de- 7 vice employed in forming a center bore supported for axial motion'by the clamp shown in FIG. 2.
FIG. 4 is a partially sectioned view illustrating a pilot drill for forming a pilot bore.
FIG. 5 is a partially sectioned elevational view illustrating a drill for enlarging the pilot bore.
FIG. 6 is a partially sectioned side elevationalview illustrating a cutting tool supported by the clamp, shown in FIG. 2, for cutting internal threads in the enlarged bore. a a
FIG. 7 is a partially sectioned elevational view illustrating a gauge provided for predetermining the length of a screw to be inserted in the screw-threaded opening formed by the cutting tool.
FIG. 8 is a partially sectioned side elevation of a screwdriver employed in seating a. screw within the internally threaded bore.
FIG. 9 is a perspective, exploded view of a modified embodiment of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now with more specificity to the drawings wherein like reference characters designate like or corresponding parts throughout the several views, there is shown in FIG. 1 an assembly, generally designated 10, which embodies the principles of the instant invention.
As a practical matter, a suitable case 12 is provided for storing and transporting the components of the assembly and therefore includes suitably configured pockets, not designated, provided therein for receiving the components of the assembly 10. Included among the components of the assembly 11]) is a clamp 14 which is employed with each of the other hereinafter described components of the assembly in repairing a fractured bone, herein designated 16.
As depicted in the drawings, for illustrative purposes, the bone 16 includes opposed, adjacent segments 18 and 20 which lie along opposite sides of a fracture designated 22. The clamp 14 is provided with an elongated body 24 of a generally C-shape configuration having a lateral projection which serves as a fixed jaw designated 26. The jaw 26 is configured so as to be received beneath the lowermost surface of a fractured bone 16 without inflicting substantial damage to contiguous tissue. Moreover, the jaw 26 includes an upwardly projected protuberance which functions as a tooth, herein designated 28. The tooth 28 penetrates the surface of the bone 16. Through the tooth 28 pressure sufficient for retaining the bone 16 within the clamp 14 is applied.
In coaxial alignment with the tooth 28 there is affixed to the body 24, near its opposite end, a bearing sleeve 30 having a cylindrical bore 32 extended therethrough. Into the bore 32 there is inserted an axially movable jaw 34 having a body 35 of a substantially cylindrical configuration. The body 35 is bifurcated at its distal end portion 36 and defines a pair of teeth 38 of a prong-like configuration. Each of the teeth 38 has formed at the distal end thereof a sharpened tip 40 through which holding pressure, opposed to the holding pressure applied by the tooth 28, is applied to the bone 16 for retaining the bone 16 within the clamp.
A setscrew 42 is threadedly received within a radially extended, internally threaded bore provided for the bearing sleeve 30. This setscrew, upon being tightened, engages the surface of the body 35 of the movable jaw 34 and secures the movable jaw in place, relative to the bearing sleeve and hence the fixed jaw 26. It will therefore be appreciated that in order to clamp the bone 16 in place between the teeth 28 and 38 of the clamp 14,
the body 35 of the movable jaw 34 is advanced throughthe bore 32 until a seated relationship is established between the tips 40 and the adjacent surface of the bone 16. An opposed force is, of course, applied to the bone 16 by the fixed jaw 26 acting through the tooth 28. Once the bone 16 is thus secured between the jaws of the clamp 14, the setscrew 42 is tightened for thereby securing the movable jaw 34 against further motion.
As shown, the movable jaw 34 is provided with a bore 44, also of a cylindrical configuration, extended therethrough. The surface of the bore 44 is of a cylindrical configuration and serves as a bearing surface for receiving, in an alternative fashion, a centering tool, designated 46, a pilot drill 48, a drill 50, a tap 52, a gauge 54 and a screwdriver 56, each of which is provided for use in repairing the bone 16.
The centering tool 46 includes a cylindrical base 58, having an outside diameter substantially equal to the inside diameter of the bore 44 so that the centering tool 46 may be axially displaced along the surface of the bore 44 in a telescopic fashion. The face of the centering tool 46 is of a frusto-conical configuration and includes a cutting tip 60 and an inclined blade 62. The cutting tip 60, as a practical matter, is a truncated bit which extends axially from the body 58 for forming a centering bore while the blade 62 is so configured as to cut into the surface of the bone 16, an opening of an inwardly directed, frusto-conical configuration. Thus, the tip 60 and the blade 62 cooperate to form a centering bore as torque and axial pressure are applied to the centering tool 46. As a practical matter, a force applicator including a chuck 64 is utilized for applying torque and pressure to the centering tool.
Once a centering bore is formed in the bone 16, the centering tool 46 is removed from the bore 32, whereupon the pilot drill 48 is inserted into the bore.
The pilot drill 48 also is provided with an elongated base 66 having an outside diameter substantially equal to the inside diameter of the bore 32, for substantially the same reasons as hereinbefore discussed with respect to the base of the centering tool 46. From the base 66 of the pilot drill there is extended in coaxial alignment therewith a drill bit 68. The drill bit preferably is a twist drill and has an outside diameter substantially equal to or slightly less than the diameter of the centering bore formed by the centering tool 46. Hence, the bit 68 is received by the centering bore which serves to preclude walking of the tip of the bit along the surface of the bone as torque is applied to the base 66. Torque and pressure are now applied to the pilot drill 48, in substantially the same manner in which torque and pressure are applied to the centering tool 46, for thus forming a pilot bore in the bone 16.
It is important here to note that it is highly desirable to prevent the drill bit 68 from passing completely through the bone 16, in order to avoid inflicting puncture and other undesired damage to tissue, blood vessels and the like found in contiguous relation with the bone. Therefore, the base 66 of the pilot drill 48 includes a concentrically related sleeve 72 rigidly affixed to the base 66 near the distal end thereof, i.e., the end thereof most remote from the drill bit 68. The sleeve 72 has an internal diameter substantially greater than the external diameter of the body 35 of the movable jaw 34. This sleeve extends in concentric relation with the base 66 and terminates in an annular face 74.
The bearing sleeve 30 is further provided with a collar 76 having an annular face 78 positioned to engage the face 74 of the sleeve 72 as the drill bit 68 is caused to reach the extremity of its penetration into the bone 16, immediately adjacent to the tip of the tooth 28. It will therefore be appreciated that the length of the sleeve 72 is such that the annular face 74 of the sleeve 72 engages the face 78 of the collars 76 at the instant the drill bit 68 reaches the extremity of its penetration into the bone 16. Therefore, the tip of the drill bit 68 cannot exit the bone 16.
Upon completion of the formation of a pilot hole within the bone 16, the pilot drill 48 is extracted from the bore 44 of the movable jaw 34 and the drill 50 inserted therein. The drill 50 is now employed for enlarging the pilot hole previously'formed in the bone 16.
In practice, the drill 50 is quite similar to the pilot drill 48, except that the drill 50 includes a bit 80 having an outside diameter substantially equal to the minor diameter of a screw to be received within the opening formed thereby in the bone 16. Therefore, a detailed description of the drill 50 is omitted in the interest of brevity. However, it will be appreciated that following the enlargment of the pilot hole formed by the drill bit 68, the drill 50 is extracted from the bore 44.
The tap 52 now is inserted into the opening formed in the bone 16 for cutting screw threads along the internal surface of the enlarged opening as torque is applied thereto. The tap 52 also includes a base 82 having an outside diameter substantially equal to the internal diameter of the bore 44. At the distal end of the base 82 there is provided a shank 84 having teeth 86 formed thereon so configured as to form a continuous helical thread as torque and attendant pressure are applied to the base 82.
A sleeve 88 is fixed to the base 82 in a manner quite similar to that in which the sleeve 72 is fixed to the base 66 of the pilot drill 48. The sleeve 88 also includes an annular shoulder, designated 90, which serves to engage the face 78 of the collar 76 for thus preventing the tap 52 from exiting the bone 16 at the extremity of its penetration. Since the sleeve 88 functions in substantially the same manner-in which the sleeve 72 functions to arrest axial motion'imparted to the base 66, a detailed description thereof is omitted in the interest of brevity. However, it is to be understood that the face 90 of the sleeve 88 engages the face 78 of the collar 76 for arresting axial motion imparted to the tap through a manipulation of the tap. A T-handle, not designated, is affixed to the end of the base 82 most remote from the teeth 86 so that the tap 52 can readily be manipulated, in a well known manner, for causing the tap to cut internal screw threads within the now enlarged opening formed within the bone 16.
In order to select a screw of an appropriate length, the gauge 54 is provided with a scale 92 for the depth of the now screw-threaded opening in the bone. The gauge 54 inlcudes an elongated base 94 having an outside diameter substantiallyequal to the inside diameter of the bore 44, for the same reasons hereinbefore set forth with respect to the base 66 of the pilot drill 48. However, the base 94 terminates in a face 96 of a frusto-conical configuration having a tip 98 projected axially therefrom for penetrating the centering bore formed in the bone 16. Therefore, it should be apparent that, in operation, the base 94 is extended into the body 35 of the movable jaw 34 only to a depth dictated by the depth of the centering bore formed bby the centering tool 46.
The scale 92 includes a barrel 100 having a concentric bore 102, of a diameter slightly greater than the diameter of the base 94, extended through the distal end thereof. An annular face 104 is formed at the base end of the barrel-1 00 in coaxial alignment with the face 78.
' Thus the barrel when received by the base 94, is positioned to seat against the face 78 as axial motion is imparted thereto.
The scale 92 further includes a calibrated blade 105 having its base 106 rigidly affixed to the barrel 100 and a distal end portion, designated 108, which terminates in coplanar relation with the tip of the tooth 28. Suitable calibrations are provided along the face of the blade 105, the calibration furtherest from, the base being designated zero. The distance between the face 96 and the tooth 28 is, of course, substantially equal to they thickness of the bone 16. This distance, in effect, determines the length of a screw 110 to be inserted into the screw-receiving opening formed in the bone.
In order to employ the gauge 54, the base 94 is inserted into the body 35 of the movable jaw 34 until the face 96 seats in the threaded opening. The barrel 100 is now telescopically advanced along the base 94 until the face 104 of the barrel seats against the face 78 of the collar. Thereupon, as a practical matter, the barrel 100 is affixed to the base 94 by manipulating a setscrew 112, similar to the setscrew 42, extended radially through the barrel 100. The gauge 54, including the barrel 100, is then removed from the clamp 14. The
distance between the face 96 and the calibration indicated zero corresponds to the operative length of the screw 110 to be inserted into the threaded opening.
The screw 110 subsequently is dropped into the bore 44 of the body 35 of the movablejaw 34 and the screwdriver 56 inserted thereafter. The screwdriver S6 includes a base 118, similar in design and function to each of the bases heretofore described. The base. 188 has an outside diameter substantially equal to the inside diameter of the bore 44 and terminates in a T-handle 120 through which torque and pressure simultaneously are applied to the screwdriver. The base 118 terminates in suitable blades 122 adapted to be'received within slots suitably formed within the head of the screw 110.
Thus by simultaneously applying torque and pressure to the screwdriver 56 the screw 110 is caused toadvance along the internal threads provided within the opening formed in the bone 16. Thus the segments of the fractured bone are joined.
OPERATION OF THE PREFERRED EMBODIMENT tance sufficient to cause the tips 40 of the teeth 38 to engage the surface of the bone 16 opposite the surface thereof engaged by the tooth'28. Suitable pressure is applied to the body 35 of the movable jaw 34 for causing the segments of the bone to close and thus be brought into a mated relationship along the plane of the fracture. Thereupon, the setscrew 42 is manipulated for securing the movable jaw 34 in fixed relation with the fixed jaw 26 for thereby securing the bone therebetween. g
The centering tool 46 is next inserted into the bore 44 of the movable jaw 34 whereupon torque and pressure simultaneously are applied for forming a center bore within the surface of the bone immediately adja cent the teeth 38. The centering tool 46 is then removed from the bore 44 and the pilot drill 48 thereafter inserted therein. Torque and pressure are then applied to the pilot drill 48 for advancing the pilot drill downwardly through the segment 18 and into the segment of the bone 16, until such time as the face 74 of the sleeve 72 seats against the face 78, for thereby arresting axial motion of the drill bit 68. Of course, the tip of the drill bit 68 does not exit the bone 16. The pilot drill I6 is now extracted from the bore 44 and the drill 50 inserted therein and advanced therealong for enlarging the opening formed by the pilot drill to a diameter equal to the minor diameter of a screw 110 to be inserted therein.
The drill 50 is now extracted from the bore 44 and the tap 52 inserted therein, Torque andpressure now are applied to the tap 52 through a manipulation ofthe T-handle, provided therefor, untilthe face of the sleeve 88 is caused to seat against the face 78 of the collar 76, whereupon axial motion of the tap is arrested. The tap is now extracted, in a conventional manner, from the screw-receiving opening thus formed.
The gauge 54, where desired, is now employed for determining the length of the screw 110 to be inserted into the thus formed internally threaded opening. This is achieved simply by seating the face 94 within the bore 44 of the movable jaw 34 and telescopically advancing the barrel 100 along the surface of the base until the face 104 of the barrel 100 seats against the face 78 of the collar 76. Thereupon, the setscrew 112 is tightened and the gauge 54 removed from the clamp 14. By measuring the distance between the calibration indicated zero and the face 96 a screw 110 of a proper length readily can be selected.
The screw 110 is then selected and dropped axially into the opening formed in the bone 16, through the bore 44, and a screwdriver 56 inserted into the bore 44 thereafter. The blades 122 provided at the end of the screwdriver 56 engage the suitably formed slots provided in the head of the screw. Torque and pressure are then applied to the screw 110, through a manipulation of the handle 120 for thus advancing the screw along the threads provided in the thus formed screwreceiving opening.
DESCRIPTION OF A MODIFIED EMBODIMENT The form of the invention shown in FIG. 9 of the drawings includes substantially the same basic structural components referred to and described in connection with the description of the embodiment shown in FIGS. 1 through 8. Therefore, corresponding reference numerals are employed for designating corresponding elements.
The embodiment of the invention illustrated in FIG. 9 is particularly suited for use in inserting in a fractured bone rigid shafts such, for example, as either a Kirschner Wire, threaded or unthreaded, or a Steinman Pin. For reasons fully understood by those familiar with techniques employed in inserting rigid shafts such as a Kirschner Wire, or a Steinman Pin into a fractured bone a great deal of difficulty often is encountered in maintaining proper alignment as the shaft is inserted into the bone, since the shaft has a propensity to wander as axial force is applied thereto.
It has, in practice, been found that the clamp 14 can be employed quite satisfactorily for establishing and maintaining proper alignment for the shaft as it is inserted into the bone 16 employing a driver.
As shown in FIG. 9, the modified assembly includes an axially displaceable bushing 200 of a generally cylindrical configuration which seats within the distal end of the body 35 and includes an axial bore 202 extended therethrough. The diameter of the bore 202 is substantially equal to the diameter of a selected shaft, designated 204, selected to be inserted into the bone 16 employing the modified embodiment of the invention.
Supported for telescopic motion along the external surface of the base end of the body 35, there is a vice 206. The vice 206 includes a tubular body 208 received at its base end by the body 35 of the movable jaw 34 and is closed at its distal end by a closure plug 210. The closure plug 210 includes an internal bore 212 having a diameter substantially equal to the diameter of the shaft 204, while a threaded setscrew 214 is extended into the closure plug for engaging the shaft 204 and securing it in a fixed relation with the body 208. The vice 206 is prepared for use as a driver for forcing the shaft 204 into the bone.
In operation, the clamp 14 is mounted on a fractured bone 16, in the manner hereinbefore described, with the exception that the axially displaceable bushing 200 previously has been inserted into the distal end of the tubular body 35 in coaxial alignment with the closure plug 210. The vice 206 is now received by the base end of the body 35, in a telescopic relationship therewith. With the setscrew 214 being backed off,the shaft 204 now is inserted through the coaxially aligned bores 202 and 212 and advanced into engagement with the adjacent surface of the bone 16. The setscrew is now tightened through a simple manipulation. Axial force now applied to the shaft 204 causes the shaft to penetrate the bone 16 without experiencing a wandering effect. Of couse, upon removal of the vice 206 and the clamp 14, excess portions of the shaft are removed by severing the shaft in an appropriate manner.
It is here noted that a scale 216 is provided on the surface of the body 35 for assuring a proper positioning of the vice 206 prior to the tightening of the setscrew 214. The scale 216 consists of indicia scribed on the surface of the body 35 which assures that the distance, between the vice 206 and the face 78, designated X, is, at the time the shaft 204 is fixed to the vice, always equal to the distance, designated Y, which substantially corresponds to the thickness of the bone 16. This is achieved simply by positioning the distal end of the body 35 in engagement with the adjacent surface of the fixed jaw 26 and scribing a mark about the surface of the body 35 immediately adjacent the face 78 of the collar 76.
In view of the foregoing, it should readily be apparent that the assembly 10 of the instant invention provides a practical solution to the perplexing problem of providing an assembly through which screws may be inserted into fractured bones while damage to surrounding tissue is minimized.
Although the invention has been herein shown and described in what is conceived to be the most practical and preferred embodiment, it is recognized that departures may be made therefrom within the scope of the invention, which is not to be limited to the illustrative details disclosed.
Having described my invention, what I claim as new and desire to serve by Letters Patent is:
1. In an assembly for inserting rigid shafts into opposed segments of a fractured bone, the improvement comprising:
a clamp including an elongated body having a fixed jaw projected laterally therefrom adapted to engage a fractured bone at a first surface thereof, a bearing sleeve fixed to said body in spaced relation to said fixed jaw, an axially movable jaw including a body of a tubular configuration supported by said bearing sleeve and having a distal end of a bifurcated configuration for engaging the fractured bone at a second surface thereof, oppositely related to said first surface, and means for securing said movable jaw in'a fixed relationship with said fixed jaw.
2. The improvement of claim 1 further comprising means for forming within the second surface of said bone in coaxial alignment with the tubular body of said movable jaw, a centering bore having an opening of an inwardly directed, frusto-conical configuration, including an elongated base configured to be received in telescopic relation with said axially movable jaw, and a cutting blade angularly projected from one end thereof.
3. The improvement of claim 2 further comprising axially movable drill means for drilling an elongated opening in said bone, including an elongated base adapted to be received telescopically within said movable jaw and supported thereby for displacement along a linear path, a drill bit projected axially from said base, and stop means for limiting axial motion imparted to said drill.
4. The improvement of claim 3 wherein said stop means includes a stop sleeve fixed to the base of said drill, in concentric relationtherewith, and means defining about said bearing sleeve an annular collar positioned to be engaged by said stop sleeve as axial motion is imparted to said axially movable drill means.
5. The improvement of claim 4 further comprising means for inserting into said elongated opening a screw-threaded shaft having a screw-head affixe'd thereto, including an elongated base configured to be received within said movable jaw, in telescopic relation therewith, and a plurality of axially extended, screwengaging blades adapted to be received by the head affixed to said screw-threaded shaft.
6. The improvement of claim 5 further comprising cutting means for forming internal screw threads in said elongated opening including an elongated base configured to be received in telescopic relation with said movable jaw' and means defining a tap projected axially from the base of said cutting means.
7. The improvement of claim 6 further comprising measuring means for determining the depth of the elongated opening formed in said bone, including an elongated base configured to be received within the tubular body of said movable jaw, a support sleeve adapted to be received telescopically by the base of the measuring means, means for securing the support sleeve to the base of the measuring means, and an elongated scale projected in parallelism with the longitudinal axis of symmetry of said support sleeve.
8. In an assembly for inserting rigid shafts into opposed segments of a fractured bone the improvement comprising:
A. a clamp including an elongated body having a fixed jaw projected laterally therefrom for engaging a fractured bone at a first surface thereof, a movable jaw including a body of a tubular configuration supported by said clamp in opposed relation with said fixed jaw for engaging the fractured bone at a second surface opposed to said first surface,
and means for securing said movable jaw in fixed 10 2. an elongated sleeve telescopically received by said movable jaw including a closure plug for closing said sleeve at one end thereof and having a second axial bore extended therethrough in coaxial alignment with said first axial bore, and 3means adapted to secure within said second axial bore an elongated shaft extended from said closure plug through said bushing and adapted to be inserted into the bone in response to axial motion imparted to the elongated sleeve; and C. stop means for limiting axial motion of said sleeve including an annular collar fixed to thevbody of said clamp in coaxial relation with said sleeve.
9. The improvement of claim 8 further including means defining a depth gauge along the external surface of said movable jaw.
10. In an assembly for inserting rigid shafts into opv posed segments of a fractured bone, the improvement comprising:
a clamp including an elongated body having a fixed jaw projected'laterally therefrom including means defining a protuberance for engaging a fractured bone at a first surface thereof, a bearing sleeve fixed to said body in spaced relation to said fixed jaw, an axially movable jaw including a body of a tubular configuration supported by said bearing sleeve including means defining 'a plurality of prongs projected axially from the tubular sleeve for engaging the fractured bone at a second surface thereof, oppositely related to said first surface, and
means for securing said movable jaw in a fixed relationship with said fixed jaw.
11. In an assembly for inserting rigid shafts into juxtaposed segments of a fractured bone, the improvement comprising:
a clamp including an elongated body member having a fixed jaw projected laterally from one end thereof for engaging a fractured bone at a first surface thereof, a bearing sleevefixed to said body member in spaced relation to said fixed jaw, an axially movable jaw including a tubular body telescopically supported for axial displacement by said bearing sleeve, and having means defining a'plurality of prongs projected axially from one end thereof, for
means including an axially movable drill member for I drilling an elongated opening in the juxtaposed segments of said bone, including an elongated base configured to bev received within said tubular body and supported thereby for axial displacement relative thereto along a linear path, and means defining a cutting sur face extended from said base.
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