2,440,123 Patented Apr. 20, 1948 UNITED STATES PATENT OFFICE 2,440,123 REMOVABLE BONE PLATE Chester H. Smith, Pittsburg, Kans. Application October 7, 1946, Serial No. 701,821 3 Claims. (Cl. 12S-92) 1 Y The instant invention relates to what is be lieved to be a new method of utilizing a bone plate for purposes of setting and repairing a bone fracture and the particular plate and other attending accessories utilized in reducing the method to actual and reliable practice. 2 pilot lever or equivalent member is separably and hingedly Vattached to said one end of the plate, this arrangement permitting the lever to be prop erly angled to form the aforementioned channel through which the lever and plate may be with’ drawn, this without requiring a further incision or secondary operation. Other objects, features and advantages will be come more readily apparent from the following In respect to the method phases, I have evolved and pursue a unique and satisfactory technique which‘ consists in exposing the bone and frac description and the accompanying illustrative ture by way of a customary incision under direct 10 vision, applying the bone plate, anchoring same to bone in proper position through the medium of retention screws, exposing wrench ends, with drawings. ' In the drawings wherein like numerals are em ployed to designate like parts throughout the views: which the screws are provided, through the outer Figure 1 is a top plan view of a lever equipped most surfaces of the flesh for subsequent removal, 15 bone plate constructed in accordance with th'e and equipping the plate at one end with‘ a hinged principles of this invention showing the assembly ly mounted, laterally positioned lever, which lever is used to define a constantly open channel in the ilesh, and which also serves as pilot means _of »anchoring screws. Figure 2 is an edge elevational view with the ' removed. for removing the main bone plate once the at 20 screws Figure 3 is a cross-section through the bone taching screws are removed; this all accomplished plate, this on the line 3_3 of Figure 2, looking in without requiring, as is ordinarily the case, a sec ond operation. the direction of the arrows. Figure 4 is a detail view of one of the screws. Interpreted from another point of view, the Figure 5 is a perspective View of the wrench or/ invention has to do with a structurally distinct 25 other tool used for removing the screws one by and readily applicable and removable bone plate one, and which is placed upon the bone by open operation. Figure 6 is a fragmentary sectional elevational under direct vision, during which time the frag- v view showing a human leg, the fractured bone, ments and muscles, or anything that exists be the'bone plate, the anchoring screws and the tween the ends of the bone fragments, may be 30 preferred withdrawal means, lever attached to removed and the ends cleaned and the best appo sition obtained, said plate being removed the the plate. Y , Referring now to Figure 6, the human leg is herein denoted by the numeral 8, the bone sec 35 tions by the numerals 9 and Ill, the fracture at ond operation. I I‘, and th'e flesh, or leg proper, at I2, Novelty is predicated, on the one hand, on a Referring now to the appliance or means under bone plate longitudinally elongated and having consideration, this comprises a longitudinally apertures to accommodate anchoring screws, said elongated plate, commonly referred to in the trade bone plate having its longitudinal edges straight as a bone plate, I3. It is provided in the instant and said plate being curved slightly in a trans 40 situation, with longitudinally spaced holes for verse direction for appropriate bone contacting anchoring screws, said screws being generally de results. noted by the numerals Ill. The plate I3 is trans Additional novelty is predicated upon novel and versely curved as indicated in Figure 3 and pro improved anchoring screws, each screw compris vided at one end with a hook I5. The hook serves 45 ing a shank having a screw threaded inner end, to accommodate the slotted end portion I6 of the a shouldered portion adjacent said inner end, a withdrawal or plate removal lever I1. This part smooth main shaft and said main shaft being re I'l is of th'e same width as the plate and also of duced at its outer end and said reduced portion the same cross-sectional dimension. The outer constituting an extension which is polygonal in end is bevelled as indicated at I8. The slot and cross-section to permit a wrench to be employed 50 hook arrangement provides the necessary sep next day or at any time withn four to sixteen weeks, this without requiring the customary sec in iirst tightening and later removing and ex- _ arable and hinging connection between the plate tracting the screws. and lever. Furthermore, and as before implied, novelty is As before mentioned, the anchoring screw com predicated upon a detachable screw equipped bone plate having means at one end whereby »a 55 prises an elongated shank I 9 cylindrical in cross 2,440,123 3 section and having an enlarged inner end portion 20 which is .fashioned into a stop shoulder and which sh'oulder is engageable with the outer sur face of the plate when said plate is applied as seen in Figure 6. The screw threaded portion beyond the shoulder is denoted at 2| :and con stitutes the means for tapping the screw into the 4 wrench for removal. They are also bevelled for additional shoulder strength. Plate also curved for additional strength. These plates will be made in many sizes as well as the extension bar and screws will be Various lengths and all are interchangeable, whereby, a short plate and long extension bar may be used or vice-versa or short bone sections 9 and IIJ as shown in Figure 6. The plate and short bar for smaller bones. All screws free end of the screw is tapered> and bifurcated and the furcations 22 facilitate the “screw action.” 10 with extension plates and extension bars with knife edge on end of extension bar for introduc The outer end of th'e shank is reduced as at 23 tion are interchangeable. and is polygonal in cross-section to provide a tool Although the description and claims show the element, this to accommodate the socket portion “withdrawal means” as having to do with a rigid of the wrench 24. piece 0f inetal hingedly connected with the plate At this stage, I desire to direct attention to and constituting the preferred ways and means two salient points having to do with the method of achieving the withdrawal step, I desire to and -appliance phases of the invention, to wit: bring forth the fact at this point that a iiexible 1. A bone plate that is placed upon the bone spring steel tape may be used and attached at by open operation under direct vision. Bone its inner end rigidly to the co-acting end of the fragments and muscle or anything that- is be tween ends oi bone fragments can be removed 20 plate. At any rate, this is an adaptation within the purview of the present invention, and although and ends cleaned and best apposition obtained-` it is not shown, the claims have been worded to Plate is applied, wound closed and cast applied. comprehend same. y Bone plate may then be removed the next day or A careful consideration of the foregoing de four to sixteen weeks. Plate may be removed 25 scription in conjunction with the invention as without secondary operation. illustrated in the drawings willî enable the reader 2. All that is necessary is that when plate is to obtain> a clear understanding and impression of to be removed, the screws are removed and exe the alleged> features of merit and novelty sufi-‘ tension bar is rocked to loosen plate from bone cient to clarify lthe construction of the invention callous and with a slight pull plate is removed. 30 vas hereinafter claimed. ` This is all done if desi-red, in the patient’s room Minor changes in shape, size, materials and or any place that the doctor wishes to remove rearrangement of _parts may be resorted to in bone plate, no secondary operation necessary; and actual practice so long as no departure is made no metal bone plate is left on the bone which may require open operation later. .This bone 35 from the invention as claimed. I claim: l Y plate has all the >advantages of being placed on I. In an 'appliance for treating bone fractures, the bone, screwed down tight, which holds» bone a bone plate, a lever, and means separably and4 in place, requiring no other operating equipment hingedly connecting the inner end of thel lever than the ordinary surgeon has in his case. No with one end of said plate. chance of leaving anything between ends of bone, thereby, getting non-union. No ñuo‘roscopy dur--4 ing the operation which is a protection from X» ray burn.. , 40 2. In an appliance for treating, bone fractures, a bone plate, a lever, and means separably and hingedly connecting the inner end of vthe lever with one end of said plate, comprising a hook on In addition to the above, I`feel disposed to em» 1 phasize and to stress the following relevant face 45 the plate and a slot in the lever. 3’. In a structural fracture treating and repair tors, to wit: » I> claim> the only bone plate that is placed direct ly on the bone under direct vision', screwed down tight with al1 the advantages of such a rigid ñXad appliance of the class described, a bone plate lon. gitudinally elongated, transversely bowed and having rectilinearly straight longitudinal edges, said bone plate being provided at one end with 50 a hook to accommodate the slotted end oi a plate operation. This is done by placing an interd loosening andv withdrawing lever.V changeable bar on the end of bone plate that is hinged at the plate, in such a manner, that sMrrH., ' any angle may be obtained and when plate is REFERENCES CITED removed, the plate and extension bar straightens 55 The following references are of record iin the and cannot become disengaged. 'I'his’exte-n'sion file oi this patent: bar is the same thick-ness and width as plates, thereby,y makes a channel for the plate to be ree UÑITED STATES PATENTS moved to follow out.- The screws are different Name Date in design, in that they are streamlined with 60 Number ` tion, plus, being removable without secondary square ends; so that ya wrench may be applied for their insertion or removed and stuck out through incision of member just far enough to apply 1,960,892 Boever _______ _»_____ May 20, 1934. 2,024,325 2,1¿Ii`3ß59 2,388,482 Allen ____________ _.. Dec. 17, 1935 Hawley „_i _______ __- Ocít. 18, 1938 Haynes .... ...-_«_.._.._ Nov. 6, 1945 .