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Patented Apr. 20, 1948
Chester H. Smith, Pittsburg, Kans.
Application October 7, 1946, Serial No. 701,821
3 Claims. (Cl. 12S-92)
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.
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
In the drawings wherein like numerals are em
ployed to designate like parts throughout the
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 '
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
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
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
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
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.
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.
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:
plate has all the >advantages of being placed on
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..
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
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
moved to follow out.- The screws are different
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
Boever _______ _»_____ May 20, 1934.
Allen ____________ _.. Dec. 17, 1935
Hawley „_i _______ __- Ocít. 18, 1938
Haynes .... ...-_«_.._.._ Nov. 6, 1945
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