Title:
Apparatus for reducing and holding fractures in position
United States Patent 2443106


Abstract:
This invention relates to improvements in an apparatus for reducing and holding fractures in position, and more particularly to a mechanical splint which can be used to reduce almost any type of bone fracture, so that the device may quite properly be described as a universal fracture splint....



Inventors:
Grosso, Patrick P.
Application Number:
US59302045A
Publication Date:
06/08/1948
Filing Date:
05/10/1945
Assignee:
Grosso, Patrick P.
Primary Class:
Other Classes:
606/59
International Classes:
A61B17/64
View Patent Images:
US Patent References:
2371519Extension and reduction appliance1945-03-13
2238869Ambulatory splint1941-04-15
2002021Surgical fracture extension appliance1935-05-21
1662758Femur splint1928-03-13
0583455N/A1897-06-01



Description:

This invention relates to improvements in an apparatus for reducing and holding fractures in position, and more particularly to a mechanical splint which can be used to reduce almost any type of bone fracture, so that the device may quite properly be described as a universal fracture splint.

The objects of this invention are an ambulatory fracture splint which: substantially reduces trauma of the tissues; can be readily applied to virtually any part of the body; is adaptable to the reduction of most any type of bone fracture; is self-contained and eliminates the need for accessories; can be adjusted and readjusted in situ when necessary; and which is adapted to securely hold any bone to which it is applied without puncturing the bone, and with minimum trauma of the bone structure.

In accordance with this invention the fragments of a fractured bone are gripped crosswise of the long axis of the bone, between the points of two spaced sets of adjustable pins, which engage the bone from opposite sides thereof at spaced points preferably arranged in intersecting planes, and the pins are then moved inwards to grip or clamp the bone between the pin points with sufficient tension to permit the pins to be utilized in manipulating the bone and setting the fracture, without substantial penetration of the bone structure, whereby trauma of the bone is substantially reduced. For purposes of manipulation, each set of pins may be yoked and mounted upon a ball-socket connection for universal adjustment and said connections may in turn be mounted for compound relative movement, to vary the distance between the fractured ends of a clamped bone, to dispose the yoked sets of pins in the same or different horizontal planes, and when necessary to vary the degree of angulation between the yoked sets of pins so as to conform with any degree of angulation required, for example as at a bone joint.

In the drawings comprising four sheets of nine figures numbered Figs. 1 to 9 inclusive, certain embodiment of the invention are set forth.

Pig. 1 is a plan view of an apparatus embodying one form of the invention as applied to a fractured bone; Fig. 2 is a side view of the apparatus only; Figs. 3 and 4 are vertical cross sectional views taken along the lines 3-3 and 4-4 respectively of Fig. 2 looking in the direction of the arrows; Fig. 5 is an end view of the splint with the bone and tissue shown in dotted outline; Fig. 6 is a horizontal cross sectional view taken along the line 6-6 of Fig. 2 looking in the direction of the arrows; Figs. 7 and 8 are vertical cross sectional views taken along the line 7-7 and 8-8 respectively of Fig. 2 looking in the direction of the arrows; and Fig. 9 is a cross sectional view of a modified form as applied to a section of a bone which is shown in dotted outline.

Like reference characters designate corresponding parts throughout the several figures of the drawings.

The invention will be better understood from Figs. 1 and 2 of the drawings which illustrate one suggested embodiment thereof. The bar 18 is longitudinally slotted to form a keyway 20 wherein a traveler 22 (Fig. 8) is longitudinally movable under control of lead-screw 19. One end of bar 18 is bent substantially at right angles and is provided with an opening forming a bearing 29 wherein one end of the lead-screw 19 is journaled. The opposite end of the lead-screw 19 is journaled in a bearing-block 32 which may be adjustably mounted adjacent the opposite end of the keyway 20. The bearing-block 32 is provided with a threaded shank 33 adapted to receive a lock-nut 34 whereby the bearing-block 32 may be securely locked in spaced relation to the bearing 29. The traveler 22 is threaded to receive the double-threaded worm of lead-screw 19. The worm is preferably provided with a left-handed thread. An operating handle 21 for operating the lead-screw 19 to move traveler 22, is mounted upon the outer end of the lead-screw 19 and is locked in position by means of a grub-screw 28. A collar 30 is mounted upon the lead-screw 19 adjacent the bearing 29, and is locked in position by a grub-screw 31. Adjacent the opposite end of lead-screw 19 an annular groove 35 is provided, and a grub-screw 36 is threadably mounted in the bearing-block 32 to engage in the annular groove 35, thus locking the lead-screw 19 against sliding movement relative to the bearing-blocks 32 and 29.

The traveler 22 (Fig. 8) is keyed in the keyway 20, and is provided with a threaded shank 83 which engages in a threaded opening in a ballsocket plate 25 of a travelling ball and socket mounting 23. The socket-plate 25 is adapted to receive the ball portion 24 of an L-shaped bracket 61. The ball and socket mounting 23 may be U-shaped or otherwise formed for attachment to the socket-plate 25. The ball-socket mounting 23 is female threaded to accommodate the lockingscrew 26 which engages the ball 24 to lock the universal joint in any selected position. The locking-screw 26 may be manipulated in any preferred manner as by means of the operating handle 27.

The saddle plate 84 (Fig. 8) is provided with an opening to receive the threaded shank 83 of the traveler 22. This opening maybe female threaded to register with the threads of shank 83. Saddle plate 84 is substantially C-shaped in cross section (Eig. 8) to hook around the edges of the bar 18, thereby securing traveler 22 and ball socket 25 and the travelling ball and socket mounting 23 against lateral movement.

The rotatable extension piece 39 is pivotally, connected to the end of the bar 18 by means of! a suitable nut and bolt 37; whereby the rotatable extension piece 39 may be swung about the pivot 37 into and out of longitudinal alignment with the longitudinal axis of the bar 18. A threaded wing bolt 38 is adjustably mounted in 'th6 rbotatable extension piece' 9 to engage the lower face of.the bar. I8, thereby locking extension pieqce 39 in alignment with, or in correct position of angulation relative to, the bar-l .8 The extension piece 39 is., substantially U shaped, the intermediate section of. extension piece 9 :being providedwith a slottedkeyway 44 (Fig. 4), adapted to receive a vertical traveler 43. The traveler 43 is provided witwh a tenon (Fig. 6), which is adapte.dto register in slotted keyway 44. The tenon, portion of traveler.:43 terminates in a threaded shank 48 furnished with a:locknut 49. Traveler 43,is threadably mounted upon. the double left-hand threaded worm of lead-screw4.0 which is journaled to rotate in upper: and lower hearings 4.1 and:45. The.buttoni head. of a.retaining screw 42 engages against the shoulder of the upper hearing '41. to secure leadscrew 40din place. Lead-screw '4. may.be manipulated. in.:any preferredimanner, as by means of the.butterfly handle:47-which may b.e attached to the lead-screw. 41 by.a grub-screw 4;6, An adjustable bracket 52 is provided with an opening adapted: to. receive the:threaded; shank 48 bof the vertical. traveler. 43, the adjustable bracket -52,,being lacked -to .the threaded; shank 48 by- the lock-nut -49 so that, the adjustable bracket -52 may: be..raised, or. lowered; with the traveler 43 relative.t. the. extension piece 39, The inte diterediatportion of, extension ePiece. 3 may. .be ;provided .with ::a, guideway 5.0 (Fig. 6) having shoulders 5.--51. .The.guideway .5_ and shoulders 51 -5.1 co-operate to insure proper :vertical: alignment of the adjustable. bracket 5.2 relative to the extension piece 39. (compare Figs. 2 3,and 6).

The adjustable bracket 52 is extendeddito form a socket-plate 55 carrying a yoke 51which is secured to the adjustable bracket 52:. in. any suitable mianner: as by; means of the screws 80-89D (Fig. 5). The. ball: 54, is-seatable.in.the socketplate 55.tto.form a universal ball and.socket.connection for.the L-shaped bracket. 6.1 which forms a continuation of the neck 60 of the ball 54. The yoke 57 is. female: threaded to ,rec.eive. the.lo,cking screw 55.8 which iis.adapted to engage the.hall, and: lock the' ball and: socket, connection in: any predetermined position. The locking: screw .5 may, be. manipulated: in: any suitable manner as by.means of the' operating:handle 58, The:surface of the ball 54Imay be milledior b.urred at. 59 to increase friction, with -the locking-sregw, 56: , The. end of Ilocking-screw ,56 may bee made concave. to :conform to the:contour, of *ball 54, -an may.be milled or burredtqt.increas. friction with the ball 54.: The:socket-plafte 55 may form anIntegral part of the adjustable bracket 52, or it may be a separate element adapted to be attached to the bracket 52 in any preferred manner as by means of the screws 53-53 (Fig. 1). By this construction the L-shaped bracket 61 carried by the universal ball and socket joint 24-25, and the L-shaped bracket 61 carried by the universal ball and socket joint 54-55, may be relatively adjiusted; i a 'vartig'y bf ways as follows: (a) by proper rhanipulation about the pivot 37 and of the vertical traveler 43 they may ibe placed in horizontal and vertical alignment; (b), by manipulation of the traveler 22 under control.of ti;e flead-screw 19 and operating handle 21 they may be disposed in varying spaced rela'iZin;- (d) b::manipulation of the vertical traveler 43 undercontrol,of the lead-screw 40 and butterf l haiidle 'i7" they may be variously disposed in differefi- horizontal planes; and (d) by manipulation of their respective universal ball and socket joints 24--25, 54.-5 they may:be dispqsed atany desired angle relative to each other.

Eaehtl L.-shaped ybraelet. I ponstitutes a separate holder for a paTr of adjustable braces ( and 65; which braces in conjunction define a bifurcated yoke for supporting a plurality of pairs of adjustable bone pins 75-75 and 79-L79 (Figs. 1 and 5). The pins 75. andc 9lare adapted to engage the structure qf a; bone-without puncturing it.

Ealh L-shaped bracket 81. (Figs. 7 and 8) i provided with a threadeg stud -' and one or more positioning; studs T62-62 The braces 64 and 65: which are substantially- L-shaped are ,35 provided wit :a plurali.ly ofadjustment hqles -6;i .and, '-G9 which ar, -large enough .to register with thhreaded stud 0 6 and th; positioning studs 62-62. The braces, 64 and 65 are respectively tongued and grooved.to register with each other (see, Fig. 7.. These severpalfeature of construction facilitate the -assembly aof the parts, so that when the adjustment holes in one of the -braces, as., for example the adjustment holes 69n the to gued1ebrace,6 are b rqughtginto co-operative registry with the threaded studq 6, and thePpositioning studs 62-6-2 of the L-shaped bracket 601, and one of the adjustment. hole' 68 of the grooved-brace 6,is,:thereafter; brought:into coQoperative registry with the threadedstud, 617, 50th ttongue of thebrace 64, registers in;thegroove ofrthe-brace 6, and-by manipulation-of the wingnut 6.8 which is threadably. mounted upon the threaded studi.'6- the -two braees /y be oked tggether. -The shoulder 8; of the L-shaped bracket 61 (Fig. 7;) tends to ,retain the: tqgiged brace 64, in correct transverse alignment. By this general arrangement -the, wing-plates -7,';. of the braýes 644 and :,(-Eig.5( 5)may be, ajustably separated -to form a yoke .or clamp of arny desired: width depeidenti up.n -the. size of the particular limbo, part ,of the;lody to which the universal fracture splint is$ intended ;to be applied.; Each braee 64 and. 65- supports, a threaded, stud-7-1 suiitgbly ,an"chored,, to ;its wig5 plate t10. -Each wing-plate 1'70forms, a suitable support-for; a pair of-bone pins whiqch are slidably adjustable tpwards- -a.,naway;from e.ec othlerq s as to penetrate the tissue and engage the,~bn structure, at four spaced4points located iin inter10 seeting. planes, The points of the.: pins engage the, bone, but. doq not penetratethe bone sub stantjallýy -;' : ' Referring .partiularly tq Figs. 1. and 5;:the wing-plate, 7 of brace 64,7 supports 'a. verticaS yoke 1'having, two vertically-spae,d obnepins 79-79. The wing-plate 70 of the brace 65 supports a horizontal guide plate 77 which is provided with spaced openings forming guideways for the horizontally spaced bone pins 75-75 secured to the horizontal yoke 74. The horizontal yoke 74 and the vertical yoke 78 and the bone pins 75-75 and 79-79 carried by the respective yokes, may be adjusted in and out by the manipulation of their respective wing-nuts 72-72. Each wing-nut 72 is provided with an annular groove 76 adapted to receive a bifurcated follower 73 suitably anchored to one of the yokes 74 or 78.

In this manner the manipulation of the wing-nut 72 causes the bifurcated follower 73 to slide the yoke 74 or 78 as the case may be, towards and away from its wing-plate 10, thereby increasing or decreasing the depth of penetration of the bone pins 75-75 or 79-79 in the tissue until the points of the bone pins engage the bone at four spaced points without however penetrating the bone substantially, and without puncturing the bone structure, the bone pins being arranged in intersecting planes upon opposite sides of the bone, whereby said bone is tightly clamped with minimum trauma between the points of the bone pins, against movement in any direction.

Thus after one end of a fractured bone has been clamped at four spaced points between one set of pins 75-75 and 79-79, and the other end of a fractured bone has been similarly clamped between the other set of bone pins 75-75 and 79-79 at four spaced points, the ball and socket joints 24-25 and 54-55 may be adjusted and locked at any desired angle relative to their respective mountings 23 and 57 and thereafter adjusted and locked by means of pivot 37 and wing bolt 38 either in longitudinal axial alignment or in any other desired position, by thumb-pressure on the butterfly handle 47 the bracket 52 may be raised or lowered relative to the bar 18, and by operating the handle 21 the spacing between the two sets of bone pins may be varied at will to increase or decrease the distance therebetween, thus retracting the fractured portions of the bone until the ends of the fractured bone are brought into the correct position for reduction of the fracture, whereupon the splint as adjusted and locked, may be retained in position as an ambulatory splint until the fracture is properly healed. In this manner the immobilization of the injured member may frequently be entirely eliminated.

The device may also be used for treating and correcting deformities of the bones, ankylosis, joint fixation, and in bone-grafting surgery. It is especially of value in those cases where a fracture requires traction for a period of time before reduction can be accomplished, as well as in those cases where manipulation of the bones is required. In those cases where an X-ray or a fluoroscopic examination discloses that reduction is not perfectly satisfactory, the locking screws may, if necessary, be loosened, the fracture manipulated, the splint readjusted in situ, and tension again applied to the locking screws.

The pins 75-75, 79-79 penetrate the body tissue 14, and the points engage the fractured pieces 15-16 of the bone upon opposite sides of the fracture line 17, to clamp the fractured pieces 15-16 of the bone between the pins 75-79 by pressure applied at spaced points arranged in intersecting planes. This is accomplished without puncturing the bone, and with minimum trauma of the tissue 14 and of the bone structure.

Fig. 9 shows a modified form of the brace, and of the ball-socket assembly. The base plate 81 and screws 82 replace the yoke 57 and screws 80.

The tongued and grooved braces 64 and 65 which make up the adjustable bifurcated yokes may also be replaced by the bifurcated yokes 85.

Each yoke 85 is made in one single piece in the general form of a horse-shoe, and is provided with a curved slot 86 for receiving one or more threaded studs 67 whereby the yoke is rockably adjustable in the curved track 88 which is formed in the curved brackets 87. The curved bracket 87 is in turn mounted upon the ball and socket joint 24-25 (or 54-55). The curved overhanging shoulder 89 of the bracket 87 engages the curved brace 85 and aligns it in the track 88. One or more wing-nuts 66 lock the brace 85 in the desired position relative to the curved bracket 87.

The universal splint may also be constructed in different sizes, for example three-small, medium, and large, equipped with bifurcated yokes and bone pins 75-75 and 79-79 of different sizes, dependent upon the size of the splint or the character of the use for which it is designed. This modified form of the device provides a universal kit with the splints graduated as to size, weight and strength according to the intended use.

In practising the method, the braces are adjusted to straddle the fractured limb above and below the point of fracture 17. The bone pins 75-75 and 79-79 are then inserted through the tissue 14 from opposite sides of each of the bone fragments 15 and 16 and crosswise the long axis of the bone, until the bone pins engage the bone structure at spaced points preferably arranged in intersecting planes. By rotating the winged nuts 72-72 the bone pins 75-75 and 79-79 move towards each other until the bone fragment 15 (or 16) is gripped between the points of the bone pins with sufficient tension to hold the bone securely. The bone pins 75-75 and 79-79 and their associated braces or pin carriers may now be utilized preferably as a part of the mechanical splint, to retract the bone fragments 15 and 16 and bring their fractured ends into alignment or setting position, whereupon the bone is set. Trauma of the tissues is substantially reduced, and since the points of the pins 75-75 and 79-79 penetrate the bone structure but slightly without puncturing it, trauma of the bone is substantially reduced.

The splint is a self-contained unit, which can be fitted without the use of wrenches, drills, extra pins, or any other accessories. It can be readily disassembled, cleaned, sterilized, and reassembled ready for further use.

Other modifications will be obvious to those skilled in the art.

What is claimed is: 1. A fracture splint comprising a plurality of pin carriers, a bar comprising a plurality of sections pivotally connected together, said pin carriers being spacedly mounted upon said bar sections with ball and socket connections, means for varying the horizontal distance between said pin carriers, and means for varying the relative level of the pin carriers, each of said pin carriers carrying oppositely disposed sets of pins with the ends of one set directed towards the ends of the other set but located in mutually intersecting planes.

2. A fracture splint comprising a bar, said bar comprising two end sections with an intermediate section therebetween, a pivotal connection betweensaid intermediate.section Pandonen endSect io., -a vertipally dispqse.i;-sliqde aLd. guide -connectiq, between said intermediate section and the qtoher. end secption,: a plurality iofpin carriers, hall aid,:socket copQections::between said:pin carriers: and the en se siectionsf sai:_ bar, a. leadscrew: for. movingone.of saidpain carriers along-its associate dend sectiqn, andaJead scre#w _f:ra.rsiqg and4 lowering, the oQher, end s.etijn a:nd- its associated pin carrier relative to the intermediate section, each of; said pin carriers carr-ying oppsitely, dispoed sets of-pins with the ends of, one set directed tPwards the ends, of the other set but located, in mutually intersecting planes. 3., 4 fracture splint comprising a bar, said bar including two end sections and an intermediate seGtiQ, a, pivotalt connectipn between, said internmdiate se.ction and one end section. a,:vertically disposed slide and guide connection-betweeýnsaid intermediate section .and the other end section, a, pair.of, pin carriers, .each of said pin carriers teing adjustable to different widths, ball and socket connections between said pin carriers and the end, sections of said bar, a lead screw for aiying one of said. pin carriers along its associated end section, and a lead screw fpr raising and-lowering the other.end section and its associated pin carrier relative to the intermediate seti.on, each.ofsaid:pin carriers carrying oppositely.disposed sets of pins with the ends of one set directed towards the ends of the other set but lqcateg.in mutually intersecting planes.

4. A. fracture splint comprising a bar, saidbar including.two.end.sections, a pair of pin carriers, each pin carrier being adjustable to varying widths universal joints for attaching said pin carriers to the end sections qf-said bar in spaced relation, a, set. of pins adjustably supported by each pin carrier and with the sets directed- towards, each other, in mutually perpendicular planes, said pins being sharpened to penetrate tissue and engage opposite sides of :a bone at a piluality. of -points spaced ,crosswise to clamp the 1ne, Without substantial trauma thereof, and leansfqor.moving said pin carriers intp and out oqf:paraelism and for varying the horizontal distance bety-ween sai! pin carriers.

5. A: facture splint; comprising a bar, said bar jnclu~ingq two end sections and an intermediate spqti,, -.p:votal connection between said. intergediate: section and one of the end sections, a pair of pin carriers, each pin carrierbeing adjus ale. to varying widths, universal joints for attaEing said. pin. carriers to the end; sections qf, said :bar.in. spaced relation, a set, of pins, adjustably .supported by each pin carrier and with the sets directed towards each other in mutually lerpendicular planes, said pins being sharpened to penetrate tissue and engage and;clamp a bone from opposite sides without substantial trauma theref,, and . means, for moving said pi, carriers into -and, oput.  parallelis.m and,:for vying the hriz ntfai djistance :between, said pin:,car.iers.

6. A fracture,splint comprising a bar, said-.ba inclu.ing:. twi, end, sections, a, pair of.: pin car,riers, eachpin- carrier b.ing, adjustable to varying :widths, universal joints for attaching said .pin carriers to the end; sections of:: sad bar in Spaced,- relation,.a set: of pins, adjustably:supporte, .dby; each pin. carrier and wih, thet sets, direptced towards :each oqther in mutaally perpepndicular planes, said pins being sharpened to penetrate tissue.; an: engage opposite sides of, a -:bone at a..Eplu.rality qf-Rints : spa.c.d ;crosswise~ . tQ..clamp thje bntge without substantial1 trauma there f, meapns f or ,reg1i.ting thl _pd.pthi Of: peneýtration of; and .the clppinag Epe.ssur:, gegarteg ly, pins, an~I means; for raiS.ngran,.lwerSip.: ...Oof saidipin carriers, relaive: to to the gtr and for varyiAg the horizontal :dist.ace separatsing said pin carriers.

; A fracture splin-t comprisitng a bar, saide-ar including twq .endi sections a4nd an internedl at section, a pivotaliconnection. between said interp1 mediate. section, and -one of. the end :seqtion a pair of pin carriers, each pin, carrier, Se ng aadjustable to .varying widths, universal, jojrnt for attaching said. pin carriers, to the end:sections of said, bar in spaced.relation, a .set of pins ;ad1, justably. supported by each; pin carrier and :with the sets.directed towards each. other. inmutually perpendicular, planes, said, pins. being,:sharpened to penetrate tissue and-engage and clamp , bone between said pins at, a plurality of spacedpoints ,20 without- substantial, trauma of- the: bone, means for regulating- the depth of penetration off and the clamping pressure- exerted, by, the pins, and means for raising and lowering, one of, said:pin carriers relative to.the-other. and for varying the :25 horizontal distance separating said pin carriers.

8. A fracture splint comprising a bar, said bar including, two end sections, a pair-of pin carriers, each pin carrier being adjustable 'to varying widths, universal joints for attaching said pin ,0 carrie:s to the end sections of said-bar in spaced relation, a set, of. pins adjustably supported- by each, pn carrier and- with the sets directed toward each other in mutually perpendicular planes, said pins being sharpened to penetrate tissue and * engage op.ppsite sides of ,a-bone at a plurality of points spaced crosswise to, clamp the bone without substantial trauma thereof, means including lead-screws for regulating the depth of penetration of, and- the clamping pressure exerted by, the pins, and-means ifncluding lead-screws, for moving said -pin carriers to -vary -the horizontal anr. the vertical distance between said'-sets of adjustable pins.

9. A- fracture -splint, comprising •an. L-shaped bar having keyways extending along its- long.itudinal and *vertical arms, travellers-associated with and movable along- each of- said, keyways, lead-screws associated with each of saidti'aveli lers f.or regulating the directionr and extentof their imoveiiient along their respective keyways, and pin carriers-rockably mounted-on-saiditravellers.

:10. A fracture splint comprising an. L-shaped bar having keyways extending along-each arm thereof, travellers associated with. and-,movable al2ng; each of--said keyways, lead-screaws-associated-with each of-saidtravellers for-regulating the direction and, extent-of their movement along their respective keyways, pin carriers rockably 0 mounted on said-travellers, a set-of pins.adjustably supported by each pin carrier, saidpinsbeing sharpened-to tpenetrate-tissue and engage- a bone at four spaced: points .thereby clamping the bone or without substantial; trauma thereof; and, means for regulating the depth, of penetration of,, and .th.-.gree. .o, cmlamping pressure exerted, by, the pins11.. fraciture,, splint coimprising. aPin, carrier, and a..plurality of#setsqf- opposit.ly. ispqsedpins suporrte.d ,ty thegcarrier, saidpins: beg .pinted .andmqnite i4nTtually interectl th the points of.-the~ pnsf, oneset- faigainwars tpQwards the peinsg of, the. :othr : set-:toqpenetate 15 tissue and engage points spaced crosswise pf..a bone from opposite sides to clamp the bone without substantial trauma.

12. A fracture splint comprising a forked brace, a plurality of pins slidably mounted adjacent the forked ends of the brace, said pins being pointed and aligned in intersecting planes with the points of the pins facing inwards, so that when the forked portion of the brace straddles the tissue about the fractured bone the pins may be moved inwards to penetrate the tissue and engage spaced points of the bone from opposite sides thereof to clamp the bone without substantial trauma thereof, means operable to regulate the extent of penetration of the pins mounted on one side of the forked brace, and means operable to regulate the extent of penetration of the pins mounted on the other side of the forked brace.

13. A fracture splint comprising a pin carrier, and oppositely disposed pairs of pins with the pins of one set mounted in a transverse plane with respect to the pins of the opposite set, means for adjustably mounting the pairs of pins for movement towards and away from each other while maintaining them in intersecting planes to penetrate the tissues and immobilize a section of bone when engaged between said pairs of pins without puncturing the bone or substantial trauma thereof.

14. A fracture splint comprising a pin carrier, oppositely disposed pairs of pins with the pins of one set mounted in a plane which intersects the plane of the other set, means for mounting said pairs of pins for movement towards and away from each other while maintaining them in intersecting planes to penetrate the tissues and immobilize a section of bone when engaged between said pairs of pins without puncturing or substantial trauma of the bone, and means for adjusting the depth of penetration of the pairs of pins to engage and immobilize the bone.

15. A fracture splint comprising an adjustable pin carrier, oppositely disposed pairs of pins with the pins of one set mounted in a plane which intersects the plane of the other set, means for mounting said pairs of pins for movement towards and away from each other while maintaining them in intersecting planes to penetrate the tissues and immobilize a section of bone when engaged between said pins without puncturing the bone or substantial trauma thereof, and means for adjusting the depth of penetration of the pins to engage and immobilize the bone.

16. A fracture splint comprising a plurality of pin carriers individually adjustable for width, oppositely disposed pairs of pins supported by each of said carriers, means for mounting said pairs of pins on said carriers in mutually intersecting planes, means for effecting movement of said pairs of pins towards and away from each other to penetrate the tissues and engage opposite sides of a section of fractured bone at four spaced points to immobilize said bone when so engaged without puncturing or substantial trauma of the bone, two of the said points lying along the long axis of a bone and the other two upon opposite sides of the said axis, said pin carriers being relatively adjustable in the same longitudinal plane into and out of parallel longitudinal planes and into and out of angularly disposed planes, and means operable to impart said relative adjustments to said pin carriers.

PATRICK P. GROSSO.

3REFERENCES CITED The following references are of record in the file of this patent: UNITED STATES PATENTS 35 Number 583,455 1,662,758 2,002,021 2,238,869 40 2,371,519 Name Date Bush --------------- June 1, 1897 Nicholson et al. ---- Mar. 13, 1928 Rouse ------------- May 21, 1935 Haynes ----------- Apr. 15, 1941 Haynes ----------- Mar. 13, 1945 OTHER REFERENCES "A Practical Treatise on Fractures and Dislocations," by L. A. Stimson (1905).