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Патент USA US2406832

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Sept. 3, 1946.
M. G. HARDINGE
~
2,406,832
FRACTURE PLATE
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Filed March 5, 1945
INVEN TOR.
?/sevrw érxgqeowss,
2,406,832
Patented Sept. 3, 1946
UNITED STATES PATENT OFFICE
2,406,832
'
FRACTURE mire
Mervy'n o. Hai‘dinge, Lon-1a Linda, use.
A‘p'piacatib‘n Maren 5,1945, Serial No. 581,075
5 Claims. (01. 128;;87)
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2
particular reference to a fracture plate which may
with‘my fracture ‘plate in‘ place thereon; ,
“Fig.1 ‘2, is a fragmentary rear‘ elevational view
be employed in the reduction of bone fractures‘, ‘
In the reduction of bone fractures, it has be
come a practice to employ a metal plate extend
line III-rm QfFig- 2-, ‘
ing along the length of the ‘bone and secured‘di
rectly to the bone on opposite sides ‘of the frac
ture by means of‘sc‘rews or other securing devices
, Referring to the drawing, 1 have illustrated in
Fig.‘ 1 apportion of thelength of a bone I frac-'
tured along the line indicated at 2; the proximal
plates is that while the plate will hold the bone
of the fragments being placed in abutting relation
My invention relates to ‘fracture plates and has
of the fracture plate, shown in Fig, 1; and
Fig. 3 is a transverse sectional view taken along
“fragment 3 and the distal fragments having been
extending into the bone structure. One of the
accurately aligned iwithreac'h other and the ends
10
difficulties encountered in the use of such metal
with each other, , To hold the bone fragments in
fragments in alignment with each other and if
properly placed will hold the adjacent fragment
this position, I employ ‘a fracture‘ plate’ indicated
more or less absorption takes place at the‘ line‘ of a
inner and outer plateelement‘s, the strips being
actually preventing healing unless the fracture
rigid along their‘ lengths even though the strips
then the fracture plate must be replaced with the
bone fragments in the new position.
nested strips, ?reside, flanges of, the outer strip 1
being bent‘ over aboutthe‘ side ?anges of the in~
ends in abutting relation with each other during - generally at ‘5, the fracture plate comprising a
the healing process, it frequently occurs that 15 pair of ‘elongated metal strips '6 and 1, comprising
preferably ‘deformed transversely in a general
the fracture, resulting in a spacing of the frag
channel-shaped crosssection, providing a pair of
ment ends away from each other Under these
side ?anges B and ‘9 interconnected by a web it
conditions, the fracture plates heretofore" em
ployed hold the bone fragment ends away from 20 which,‘ if desired‘, may‘ "be given a curved trans
verse shape.‘ Thecurve of the web and the side
each other, materially interfering with the rapid
?angesajct to render the plate elements 5 and ‘I
healing at the fracture line and in some instances
may be formed from relatively ‘thin material.
plates are removed, the bone fragments again
pressed into abutting relation with each other ‘and 25 _ Each fracture plate is preferably formed of two
'ner strip‘ 6‘ to‘ form‘
It is therefore an object of my invention to
provide a fracture plate which, while‘ it will hold
the bone fragments in accurate alignment‘ with
each other, will automatically become shortened
across the fracture line in the event any absorp~
tion at the fracture line takes place.
or extending motion of the strips relative to each
01911811.,
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Another object of my invention is to provide
fragments tending to press the fragments toward
each other will cause an automatic shortening of
the plate across the fracture line..
Another object of my invention is to provide
45
a fracture plate of the character described‘wh‘ere
in the fracture plate is yieldable longitudinally of
the bone fragments to permit movement of the
Other objects and advantages of my invention
.
s'crewsthroug'h the overlapping portions of the
members‘? and] as‘, by forming elongated slots
l2 and ‘twain the ‘plates land 6, respectively, the
widthkof theslot‘ I21 being such as to permit the
passage of thejhlead‘ ‘ofa screw ls while the slot
[2d is‘ formed of a width which will permit the
passage er thes‘crew but not, the head.
‘
Thus, “the nature ‘plate when placed upon’ the
bone may beel‘ongated as trbyymojving thestrlps
to an extended-‘position relative to each other to
place the openings ‘12 and Lia on the inner and
outer strips in such longitudinal relation to each
bone fragments toward each other but is pre
vented from elongation’ by forces tending tov move
H
,
sides ‘Of the ‘fracture line 2, and I prefer to insert
‘
. g
,
of the strips 6 and ‘1,’ respectively, on opposite
a fracture plate of the character described where
in any force exerted longitudinally of the bone 40
the bone fragments apart.
V,
fracture‘ plate“ may be secured to the bone
by_meansi“of_screws l‘jl, these screws extending
through circular openings in the web it of each
Another object of my invention is to provide a
fracture plate of the character described wherein
the fractureplate is adjustable in length while in
place upon the bone.
trackway along which the
flanges of the, stripjG .rn'ay slide in a contracting
‘
50 other that after the screws l3‘ are inserted, the
strips may be moved in a contracting direction
as the tone fragment‘ ends‘ are pressed into tight
will be apparent from a study of the‘ following
sentiment‘ with earn ctneranq the fracture plate
speci?cations, read in connection with the accom
will hold" -e" bones‘ aceurate alignment ‘with
panying drawing, wherein
Fig. l is‘a perspective view of a bone section 55 eac '‘ other, straining‘ thepati'ent to resume ac
2,406,832
3
tivity with assurance that the fragments will be
held in such alignment.
4
pling said plates for telescopic movement relative
to each other between an extended position and
For example, if the fracture plate is used upon
a contracted position, and means for resisting
leg bones, the patient may be permitted to walk
movement of said plates toward said extended po
within a relatively short time of the setting of the Cl sition but permitting substantially free movement
bone fragments and such weight as may be placed
of said plates toward said contracted position. W
upon the broken bone will cause the bone frag
ment ends to be urged toward each other, insur
2. In a fracture plate to be secured to a pair of
bone fragments and to extend across the fracture
ing the tight abutment of the bone fragments
line, a pair of plate elements extending in over
throughout the healing period. Thus if any ab 10 lapping relation to each other, means intercou
sorption of the bone structure occurs at the line
pling said plates for telescopic movement relative
of fracture during the healing process the bone
to each other between an extended position and a,
fragments will not be held in spaced relation to
each other but will be permitted to move toward
each other su?iciently to take up for any such
absorption.
.
It is extremely desirable, however, that while
the contracting movement of the plate strips may
be permitted, means should be provided for pre
venting extending movement or elongation of the
plate strips across the fracture line. To accom
plish this, I prefer to provide an over-riding
clutch structure between the strips 6 and 1. As
seen particularly in Figs. 2 and 3, the side ?ange
contracted position, and means for resisting
movement of said plates toward said extended
position but permitting substantially free move
ment of said plates toward said contracted posi
tion, said last named means comprising an over
riding clutch interposed between said plates.
3. In a fracture plate to be secured to a pair of
bone fragments and to extend across the fracture
line, a pair of plate elements, each formed as an
elongated substantially channel shape, said plates
being disposed in overlapping relation to each
other, the flanges of the channel of one of said
9a of the inner strip 6 is partially cut away along 25 elements extending about and enclosing ?anges
an angular line M to provide a space in the chan
of the other of said elements to interconnect the
two elements for telescopic movement between an
extended position and a contracted position, and
an over-riding clutch disposed between the ?anges
the depth of the ?ange 9a. By placing the frac 30 of the two elements for resisting movement of the
ture plate upon the bone with the inner strip 6
elements toward their extended position while
uppermost, the disk [5 will always tend to ride
permitting substantially free movement of said
outwardly upon the angular surface M, effectively
elements toward their contracted position.
clamping the strips 6 and ‘I to each other against 4. In a fracture plate to be secured to a pair of
elongation of the assemlbed strips while any tend
bone fragments and to extend across the fracture
ency of the strips to move toward the contracted
line, a pair of plate elements, each formed as an
position will be unresisted by the disk i 5. To aid
elongated substantially channel shape, said plates
in this clamping action and particularly to pre
being disposed in overlapping relation to each
vent any lost motion between the strips 6 and 1
other, the ?anges of the channel of one of said
when any elongating force is exerted between 40 elements extending about and enclosing ?anges of
them, I prefer to provide means for resiliently
the other of said elements to interconnect the two
urging the disk i5 toward its clamping position.
elements for telescopic movement between an ex
This may be done by providing a spring ?nger
tended position and a contracted position, an an
i6 extending along the channel formed by the
gular surface formed upon the enclosed ?ange
bent over ?ange 9 of the outer strip and, as illus
of one of said elements, a disk disposed between
trated in Fig. 2, such spring ?nger may be formed
said surface and. the surrounding flange of the
merely by cutting out a portion ll’ of the ?ange
other element to comprise an over-riding clutch
9a, leaving a relatively thin ?nger of the metal
permitting substantially free telescopic movement
of the strip 6 bent as indicated at It to engage
of said plates toward their contracted position but
the disk [5.
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resisting movement of said plates toward their
The metal of which the fracture plates’ are
extended position.
made is preferably steel or some material which
5. In a fracture plate to be secured to a pair of
has inherent resilience and thus the ?nger [6 will
bone fragments and to extend across the fracture
resiliently urge the disk toward its clamping po
line, a pair of plate elements, each formed as an
sition.
’ elongated substantially channel shape, said plates
It will thus be apparent that while the frac
being disposed in overlapping relation to each
ture plate is in place upon a pair of bone frag
other, the ?anges of the channel of one of said
ments, the exertion of forces longitudinally of
elements extending about and enclosing ?anges of
the bone fragments tending to move them toward
the other of said elements to interconnect the two
each other will permit a contracting movement 60 elements for telescopic movement between an ex
of the assembled fracture plate while any force
tended position and a contracted position, an an
tending to separate the bone fragments will be
gular surface formed upon the enclosed ?ange of
effectively resisted by the action of the over
one of said elements, a disk disposed between said
riding clutch structure herein described.
surface and the surrounding flange of the other
While I have shown and described the preferred 65 element to comprise an over-riding clutch permit
embodiment of my invention, I do not desire to
ting substantially free telescopic movement of said
be limited to any of the details of construction
plates toward their contracted position but resist
shown and described herein, except as de?ned in
ing movement of said plates toward their extended
the appended claims.
position, and spring means normally urging said
I claim:
70 disk along said angular surface toward a clamp
1. In a fracture plate to be secured to a pair of
ing position between said surface and the enclos
bone fragments and to extend across the fracture
line, a pair of plate elements extending in over
lapping relation to each other, means intercou
nel de?ned by the bent over ?ange 9 of the outer
strip and a small disk I5 is inserted in this space.
The diameter of the disk is substantially equal to
ing ?ange.
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MERVYNV G. HARDINGE.
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