Note: Descriptions are shown in the official language in which they were submitted.
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A DC~rBLE NAIL GUIDING SYSTE2l FOR TARGETING
OF DI~TAI, 8CREW HOLES OF Illq~ERLOC~ING N~ILS
BACKGROUND OF THE INVENTION
s Successful placement of the distal screws into a tibial
and femoral interlocking nail without roentgenogram assistance is
a technically demanding procedure, because the accuracy of the
targeting device included in the original nail Ino~nted svstems
requires a time wasting and inaccurate m~thod. Furthermore,
the most commonly used t~chnigue for distal interlocking screw
placoment is the freehand method. ~owever, the fr~e~And method stil7
includes the drawbacks of time expenditure and radiation exposu~e-
Therefore, it is an object of the present invention toprovide a new guiding system which may obviate and mitigate the
above-mentioned drawbacks.
SUMMARY OF THE INVENTION
This invention relates to a double nail guiding system.
It is the primary object of the present invention to
provide a double nail guiding system which includes a combination
of two interlocking nails of equal length and/or e~ual size for the
distal screw targeting procedure.
It is another object of the present invention to
provide a double nail guiding system which is simple in
structure.
It is still another object of the present invention to
provide a double nail guiding system which is easy to adjust
during the operation.
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It is still another object of the present invention to
provide a double nail guiding system which is economical to
produce.
It is still another object of the present invention to
provide a double nail guiding system which is accurate during the
operation.
It is still another object of the present invention to
provide a double nail guiding system which markedly saves
operation time.
It is still another object of the present invention to
provide a double nail guiding system which is radiation-free in
the process of targeting the distal interlocking screws during
the operation.
It is a further object of the present invention to
provide a double nail guiding system which can be used for a long
time.
Other objects and merits and a fuller underst~n~ing of
the present invention will be obtained by those having ordinary
skill in the art when the following detailed description of the
preferred embodiment is read in conjunction with the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a double nail guiding
system for targeting of distal screw holes of the tibia
interlocking nail according to the present invention;
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- FIG. 2 is a perspective view showing the application of
the double nail guiding system in the tibia for targeting the
most distal interlocking screw hole;
FIG. 3 shows the application of a drill in the most
distal screw hole of the double nail guiding system in the tibia;
FIG. 4 shows a view illustrating the driving of the
transfixing interlocking screw into the most distal screw hole of
the double nail guiding system in the tibia;
FIG. 5 is an exploded view of a double nail guiding
system for targeting of a distal screw hole of the femoral
interlocking nail according to the present invention;
FIG. 6 is a perspective view showing the application of
the double nail guiding system in the femur for targeting the
most distal interlocking screw hole;
FIG. 7 shows the application of a drill in the most
distal screw hole of the double nail guiding system in the femur;
and
FIG. 8 shows a view illustrating the driving of the
transfixing interlocking screw into the most distal screw hole of
the double nail guiding system in the femur.
DETATT.T~n DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference to the drawings, and in particular to
FIG. 1 thereof, the double nail guiding system in accordance with
the invention includes a tibial twin jig (1) which may be
connected to two nails (3,4) of equal length with two separate
21~1~82
(~olding screws (2). The nail that will be driven into the
fractured tibia is called the "true nail". The other nail at the
medial border of the leg is called the "guiding nail" based on
its use as a guide. For example, in right tibia unstable
fractures, the left side interlocking nail (3) of this
combination is the true nail which will be inserted into the
fractured tibia. The right side nail (4) on the medial side of
the leg acts as a guiding nail. Alternatively, in left tibia
unstable fractures, the right side nail (4) acts as the true
nail, and the left side nail (3) acts as the guiding nail.
As shown in FIG. 2, using the double nail guiding
system in accordance with the invention, a K-wire (5) and an
eccentric guiding pipe (6) are used in targeting the most distal
screw hole of the true nail (3) inside the tibia. Due to the
fact that the position of the distal screw holes of the tibia
interlocking nail may include errors as a result of
manufacturing, sets of centric and eccentric pipes are designed
to correct these intrinsic errors.
Additionally, a guiding probe (7) is put into the true
nail (3) from the proximal end to the distal end to make sure
that the K-wire (5) is transfixing through the most distal screw
hole of the true nail (3). A metallic sound may be heard when
the guiding probe (7) hits the K-wire (5). Thereafter, the K-
wire (5) and the guiding pipe (6) are removed.
FIG. 3 shows a drill (8) going through the K-wire (5)
pre-drilled cortices. The guiding probe (7) may be used again to
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2121882
nake sure that the drill (8) is transfixing the true nail (3~.
Thereafter, the drill (8) and the guiding nail (4) are removed.
FIG. 4 shows a screw (9) being driven into the true
nail (3). The guiding probe (7) may be used to make sure that
the screw (9) is driven at the proper location. No radiation
exposure is n~cess~ry.
The targeting of the second distal interlocking screw
hole of the tibia interlocking nail is performed following the
same procedures described above.
FIG. S illustrates an exploded view of a femoral twin
jig (10) according to the present invention. The femoral twin
jig (10) may be connected to two nails (11,12) of equal length
with two separate holding screws (2). The nail that will be put
into the fractured femur is called the "true nail". The other
nail at the lateral border of the thigh is called the "guiding
nail" h~e~ on its use as a guide. For example, in right femoral
unstable fractures, the left side interlocking nail (11) of this
combination is the true nail which will be inserted into the
fractured femur. The right side nail (12) on the lateral side of
the leg acts as the guiding nail. In left femoral unstable
fractures, the left side nail (11) still acts as the true nail
and the right side nail (12) acts as the guiding nail. Due to
the fact that the position of the distal screw holes of the
femoral interlocking nail may include errors as a result of
manufacturing, sets of eccentric pipes are designed to correct
these intrinsic errors.
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_ As shown in FIG. 6, using the double nail guiding
system in accordance with the invention, a K-wire (5) and an
eccentric guiding pipe (6) are used to target the most distal
screw hole of the true nail (11) inside the femur. Additionally,
a guiding probe (7) is put into the true nail (11) from the
proximal end to the distal end to make sure that the K-wire (5)
is transfixing through the most distal screw hole of the true
nail (11). A metallic sound may be heard when the guiding probe
(7) hits the K-wire (S). Thereafter, the K-wire (5) and guiding
pipe (6) are removed.
FIG. 7 shows a drill (8) going through the K-wire (5)
pre-drilled cortices. The guiding probe (7) may be used again to
make sure that the drill (8) is transfixing the true nail.
Thereafter, the drill (8) and guiding nail (12) are removed.
FIG. 8 shows a screw (9) being driven into the true
nail (ll). The guiding probe (7) may be used to make sure that
the screw (9) is driven at the proper location. No radiation
exposure is necess~ry.
The targeting of the second distal interlocking screw
hole of the femur interlocking nail is performed following the
same procedures described above.
It should be noted, however, that the present invention
(system) may be used for targeting different types of
interlocking nails.
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- The interlocking nails in accordance with the invention
may be used for long bone fractures, such as tibia, femur,
humerus, radius, ulna, metacarpal and metatarsal fractures etc.
The application of the present invention is too wide to
be mentioned and cannot be all enumerated here in detail It is
understood that the present disclosure is made by way of example
only, and that numerous changes in the detail of the construction
and combination of parts may ~e resorted to without departing
from the spirit and scope of the invention as hereinafter
claimed.
