CN113729903B - Femoral intramedullary nail fixation system - Google Patents
Femoral intramedullary nail fixation system Download PDFInfo
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- CN113729903B CN113729903B CN202110930471.2A CN202110930471A CN113729903B CN 113729903 B CN113729903 B CN 113729903B CN 202110930471 A CN202110930471 A CN 202110930471A CN 113729903 B CN113729903 B CN 113729903B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/74—Devices for the head or neck or trochanter of the femur
- A61B17/742—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck
- A61B17/744—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck the longitudinal elements coupled to an intramedullary nail
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B2017/8655—Pins or screws or threaded wires; nuts therefor with special features for locking in the bone
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
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- Surgical Instruments (AREA)
Abstract
The invention discloses a femoral intramedullary nail fixing system, which belongs to the technical field of orthopedic implants and comprises a main nail, a bevel tension screw and a transverse tension screw, wherein a first nail hole for accommodating the bevel tension screw and a second nail hole for accommodating the transverse tension screw are respectively arranged on the main nail, a third nail hole for accommodating the transverse tension screw is arranged on the bevel tension screw, the transverse tension screw is in clearance fit with the third nail hole, an internal thread is arranged in the second nail hole, and a first external thread matched with the internal thread is arranged at the rod part of the transverse tension screw. The femoral intramedullary nail fixing system is convenient for the transverse tension screw to be matched with the lag screw and can prevent the transverse tension screw from loosening and even withdrawing nails.
Description
Technical Field
The invention relates to the technical field of orthopedic implants, in particular to a femoral intramedullary nail fixing system.
Background
The proximal femur fracture surgery generally adopts PFBN (proximal femur bionic intramedullary nail system) intramedullary nail technology to fix the fracture end, as shown in fig. 1, the technology comprises a main nail 1', a lag screw 2' (lag screw) penetrating through the upper part of the main nail 1', and a transverse tension screw 3' (lag screw) penetrating through the top of the main nail 1' and the lag screw 2', wherein the main nail 1' is placed in the femoral marrow cavity, the fracture end is driven into by the transverse tension screw 3' and the lag screw 2', and a triangular supporting structure is formed after interlocking, so that the stability of the fracture end is maintained.
In this triangular support structure, the main nail is fixed in the femoral medullary cavity, and is sufficiently stable by means of the interlocking screws passing through the shaft thereof. After the oblique lag screw passes through the oblique screw hole at the upper part of the main screw, the oblique lag screw can only move back and forth or rotate circumferentially on the axis in the direction of the oblique screw hole of the main screw; the transverse tension screw can be kept stable after passing through the nail hole at the top of the main screw and the junction hole of the inclined tension screw rod part. The transverse tension screw is used for fixing the main screw and the oblique tension screw, and is self-stabilized by the tail cap matched with the main screw.
The triangle bearing structure of PFBN stably relies on the tail cap of main nail upper end to compress tightly the transverse tension screw of proximal end, because tail cap and transverse tension screw are rigid structure, be the point (approximate line) contact when two contact are joined in marriage, even screw up the tail cap in the art, also cause the not hard up of tail cap very easily after the art, transverse tension screw is not hard up even the nail that moves back, and then influences whole triangle bearing structure's stability.
Disclosure of Invention
The invention aims to provide a femoral intramedullary nail fixing system which is convenient for a transverse tension screw to be matched with a lag screw and can prevent the transverse tension screw from loosening and even withdrawing nails.
In order to solve the technical problems, the invention provides the following technical scheme:
the utility model provides a thighbone intramedullary nail fixing system, includes main nail, lag screw and horizontal tension screw, be equipped with respectively on the main nail be used for holding the first nail hole of lag screw and be used for holding horizontal tension screw's second nail hole, be equipped with on the lag screw and be used for holding horizontal tension screw's third nail hole, horizontal tension screw with third nail hole clearance fit, the second nail hole is equipped with the internal thread, horizontal tension screw's pole portion be equipped with internal thread matched with first external screw thread.
Further, the internal thread is located in the middle of the second nail hole, and two ends of the second nail hole are all light holes.
Further, the diameter of the light hole is larger than the diameter of the internal thread.
Further, the head of the transverse tension screw is provided with a second external thread, the second external thread is a cancellous bone thread, and the first external thread is a locking thread, wherein:
the pitch of the first external thread is equal to the pitch of the second external thread;
or the pitch of the first external thread is smaller than that of the second external thread;
or, the pitch of the first external thread close to the head of the transverse tension screw is equal to that of the second external thread, and the pitch of the first external thread gradually decreases from the head to the tail of the transverse tension screw.
Further, the shaft portion of the transverse tension screw comprises a first shaft portion located at the tail portion and a second shaft portion located at the head portion, the diameter of the first shaft portion is larger than that of the second shaft portion, and the first external thread is located on the first shaft portion.
Further, be equipped with the UNICOM in the main nail first nail hole and the axial communication hole of second nail hole, the oblique lag screw is located the downthehole pole portion of first nail is equipped with vertical first through-hole, horizontal tension screw is located the downthehole pole portion of second nail is equipped with vertical second through-hole, wear to be equipped with the dead lever in axial communication hole, first through-hole and the second through-hole.
Further, the second through hole is a slotted hole;
and/or the aperture of the axial communication hole is larger than the diameter of the fixed rod, and the diameter of the first through hole is equal to the diameter of the fixed rod.
Further, the femoral intramedullary nail fixing system further comprises a locking cap, a threaded hole communicated with the second nail hole is formed in the tail end face of the main nail, the locking cap is in threaded connection with the threaded hole, and the locking cap can be abutted against the fixing rod.
Further, a fixed gasket is arranged between the lock cap and the fixed rod;
and/or, the third nail hole is a slotted hole.
Further, the lag screw comprises a screw body and a tail cap positioned at the tail end of the screw body, the diameter of the tail cap is larger than that of the screw body, a first screw hole for installing the lag screw on the main screw is provided with a step matched with the end face of the tail cap, and the diameter direction of the step is not more than the center line of the first screw hole.
The invention has the following beneficial effects:
the femoral intramedullary nail fixing system comprises a main nail, a lag screw and a transverse tension screw, wherein a third nail hole for accommodating the transverse tension screw is formed in the lag screw, and the transverse tension screw is in clearance fit with the third nail hole, so that the transverse tension screw is conveniently matched with the lag screw, and the force distribution is more balanced; the second nail hole is provided with an internal thread, the rod part of the transverse tension screw is provided with a first external thread matched with the internal thread, so that the transverse tension screw can be matched with the main nail more tightly, the self-locking with the main nail is realized, and the loosening and even the screw withdrawal of the transverse tension screw are prevented.
Drawings
FIG. 1 is a schematic structural view of a prior art proximal femoral bionic intramedullary nail system, with an enlarged view of a portion I additionally shown;
FIG. 2 is a schematic view showing the overall structure of an embodiment of the femoral intramedullary nail fixation system of the present invention;
FIG. 3 is a schematic overall structure of another embodiment of the femoral intramedullary nail fixation system of the present invention;
FIG. 4 is a schematic overall construction of a further embodiment of the femoral intramedullary nail fixation system of the present invention, with an enlarged schematic construction of a second nail hole additionally shown;
FIG. 5 is a schematic view showing the structure of the femoral intramedullary nail fixation system of the present invention in an initial state in use, with additional enlarged schematic view showing the fixation rod;
FIG. 6 is a schematic view showing a structure of the femoral intramedullary nail fixation system of the present invention in a changed state in use, with an enlarged schematic view showing an attachment rod;
FIG. 7 is a schematic view of the structure of a lateral tension screw in the femoral intramedullary nail fixation system of the present invention;
FIG. 8 is a schematic view showing the structure of a locking cap in the femoral intramedullary nail fixation system of the present invention, wherein (a) is a front view and (b) is a perspective view;
FIG. 9 is a schematic view of the configuration of three different thread pitches of the transverse tension screw in the femoral intramedullary nail fixation system of the present invention;
fig. 10 is a schematic view showing the construction of a lag screw in the femoral intramedullary nail fixation system of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The invention provides a femoral intramedullary nail fixing system, which comprises a main nail 1, a lag screw 2 and a transverse tension screw 3, wherein a first nail hole 11 for accommodating the lag screw 2 and a second nail hole 12 for accommodating the transverse tension screw 3 are respectively arranged on the main nail 1, a third nail hole 21 for accommodating the transverse tension screw 3 is arranged on the lag screw 2, the transverse tension screw 3 is in clearance fit with the third nail hole 21, an internal thread 121 is arranged on the second nail hole 12, and a first external thread 32 matched with the internal thread 121 is arranged on the rod part of the transverse tension screw 3.
In use, the main nail 1 can be firstly held by a surgical tool, the treated femoral marrow cavity is implanted, then the oblique lag screw 2 is held by the tool to pass through the first nail hole 11 on the main nail 1 for installing the oblique lag screw 2, and then the transverse lag screw 3 is held by the tool to be screwed into the second nail hole 12 on the main nail 1 for accommodating the transverse lag screw 3 and pass through the third nail hole 21 on the oblique lag screw 2, so that the implantation is completed.
The femoral intramedullary nail fixing system comprises a main nail 1, a lag screw 2 and a transverse tension screw 3, wherein a third nail hole 21 for accommodating the transverse tension screw 3 is formed in the lag screw 2, and the transverse tension screw 3 is in clearance fit with the third nail hole 21, so that the transverse tension screw 3 is conveniently matched with the lag screw 2, and the force distribution is more balanced; the second nail hole 12 is provided with an internal thread 121, the rod part of the transverse tension screw 3 is provided with a first external thread 32 matched with the internal thread 121, so that the transverse tension screw 3 can be matched with the main nail 1 more tightly, the self-locking with the main nail 1 is realized, and the loosening and even the nail withdrawal of the transverse tension screw 3 are prevented. The invention is mainly suitable for intramedullary fixation of proximal femur fracture in surgical operation.
As shown in fig. 2-4, the internal thread 121 is preferably located in the middle of the second nail hole 12, with the two ends of the second nail hole 12 being light holes 122, 122', respectively. The diameter of the light holes 122, 122' is preferably larger than the diameter of the internal thread 121, and the diameter of the light hole 122 at the left end of the embodiment shown in the figure is larger than the diameter of the internal thread 121 at the middle part, so that the light hole can play a guiding role when the transverse tension screw 3 is implanted; the diameter of the right end unthreaded hole 122' of the embodiment shown in the figure is larger than the diameter of the middle internal thread 121, so that when the transverse tension screw 3 is taken out after fracture healing, the rod part of the transverse tension screw 3 can be prevented from being deformed due to stress, and the position of the second external thread 33 of the head part of the transverse tension screw 3 can be prevented from interfering with the inner side port of the second nail hole 12 of the main nail 1 when taking out.
As shown in fig. 7 and 9, the head of the lateral tension screw 3 may be provided with a second external thread 33, the second external thread 33 being a cancellous bone thread, the first external thread 32 being a locking thread, the pitch of the first external thread 32 and the pitch of the second external thread 33 may have the following design:
structural form 1: the pitch P of the first external thread 32 is equal to the pitch P of the second external thread 33 (as shown in fig. 9 (a));
structural form 2: the pitch P-L of the first external thread 32 is smaller than the pitch P of the second external thread 33 (as shown in fig. 9 (b)), so that when the transverse tension screw 3 is implanted, the advancing speed of the second external thread 33 is greater than the advancing speed of the first external thread 32, and the fracture line M of the femoral neck can be pressurized during the screwing process of the screw;
structural form 3: the pitch P of the first external thread 32 near the head of the transverse tension screw 3 is equal to the pitch P of the second external thread 33, and the pitch of the first external thread 32 gradually decreases from the head to the tail of the transverse tension screw 3 (as shown in fig. 9 (c)), so that the fracture line M of the femoral neck can be pressurized along with the screwing of the transverse tension screw 3, and meanwhile, the pitch of the second nail hole 12 for accommodating the transverse tension screw 3 on the main nail 1 is unchanged, and in the screwing process of the first external thread 32, the first external thread 32 is tightly matched with the second nail hole 12 of the main nail 1 due to the pressurization among the pitches, so that super-strong self-locking is realized.
As shown in fig. 7, the transverse tension screw 3 may be designed with different diameters (variable diameter structure), the rod part of the transverse tension screw 3 comprises a first rod part 34 positioned at the tail part (left end in the figure) and a second rod part 35 positioned at the head part (right end in the figure), the diameter of the first rod part 34 is larger than that of the second rod part 35, the first external thread 32 is positioned on the first rod part 34, the second external thread 33 is positioned on the second rod part 35, and the stress concentration of the product is mainly the transverse tension screw 3, so that the diameter of the first rod part 34 is thicker, and the transverse tension screw 3 can be prevented from being broken in use; the second rod part 35 is matched with the third nail hole 21 of the lag screw 2, the diameter of the second rod part 35 is thinner, the diameter of the third nail hole 21 matched with the second rod part can be reduced, and the lag screw 2 is prevented from being broken due to the fact that the position of the third nail hole 21 is too thin. Therefore, the transverse tension screw 3 and the oblique tension screw 2 can be well prevented from being broken. The third nail hole 21 is preferably a oblong hole, so that the transverse tension screw 3 can be jogged in the third nail hole 21.
As shown in fig. 3 and 7, the tail of the transverse tension screw 3 may be provided with a tail cap 36 for limiting the depth, so that during the screwing of the transverse tension screw 3 into the second nail hole 12 on the main nail 1, the tail cap 36 at the tail of the transverse tension screw 3 is always positioned at the outer side of the free bone piece 5, and can pressurize the free bone piece 5 at the outer side of the femur, and tighten the free bone piece 5 towards the femur.
As shown in fig. 2-3, the main nail 1 may be provided with an axial communication hole 14 for communicating the first nail hole 11 and the second nail hole 12, the rod portion of the lag screw 2 located in the first nail hole 11 is provided with a vertical first through hole 22, the rod portion of the transverse tension screw 3 located in the second nail hole 12 is provided with a vertical second through hole 31, the fixing rod 4 is penetrated in the axial communication hole 14, the first through hole 22 and the second through hole 31, the fixing rod 4 penetrates through the second through hole 31 of the rod portion of the transverse tension screw 3 to prevent circumferential rotation, compared with the prior art, as the fixing rod 4 sequentially penetrates through the second through hole 31 of the transverse tension screw 3, the axial communication hole 14 of the main nail 1 and the first through hole 22 of the lag screw 2, the three can be firmly fixed together, the firmness of the whole system is improved, complete locking of the femoral intramedullary nail fixing system is realized, the transverse tension screw 3 can reach a locking state, the transverse tension screw 3 is prevented from moving forwards and backwards axially, and even the screw 3 is prevented from loosening. The second through hole 31 is preferably a slotted hole, so that the transverse tension screw 3 can be jogged back and forth in the axial direction after the fixing rod 4 is inserted into the second through hole 31 of the transverse tension screw 3.
The inventor finds that, in the research process, because the lag screw 2 is supported by the main screw and the transverse tension screw 3, the strength of the main screw 1 is obviously higher than that of the transverse tension screw 3, and the lag screw 2 is influenced by the angle and the matching mode with the triangular area, uneven pressure distribution from the femoral head is easily caused, and the transverse tension screw 3 is broken. To solve this problem, the present invention may adopt the following structural form:
as shown in fig. 2 to 6, in order to prevent the transverse tension screw 3 from breaking due to the total pressure, the diameter of the axial communication hole 14 is preferably larger than the diameter of the fixing rod 4, and the diameter of the first through hole 22 is equal to the diameter of the fixing rod 4. In the embodiment shown in the drawings, in the initial state after installation, the aperture of the fixing rod 4 and the axial through hole 14 in the main nail 1 is about 2 delta L clearance (as shown in fig. 5, namely, single side delta L), when the femoral head transmits pressure F to the intramedullary nail fixing system after operation, the lag screw 2 is forced to retreat and transmits pressure to the rod part of the transverse tension screw 3 through the position of the third nail hole 21, the rod part of the transverse tension screw 3 is forced to bend downwards, meanwhile, the lag screw 2 retreats backwards along the axial direction, when the transverse tension screw 3 bends to a certain extent, the transverse distance of the retreating of the lag screw 2 reaches delta L, at the moment, the fixing rod 4 is clung to (as shown in fig. 6, the distance is 0) on the outer side wall of the axial through hole 14 in the main nail 1, the continuous retreating of the lag screw 2 is blocked, so that part of the pressure transmitted by the femoral head of the lag screw 2 is shared, and the transverse tension screw 3 is prevented from being broken due to bearing all pressure.
As shown in fig. 2 and 8, to lock the fixing rod 4, the femoral intramedullary nail fixing system may further include a locking cap 13, a threaded hole 15 communicating with the second nail hole 12 is provided on the tail end surface of the main nail 1, the locking cap 13 is screwed into the threaded hole 15, and the locking cap 13 can be abutted against the fixing rod 4.
Preferably, the middle part of the locking cap 13 may be provided with a threaded section 131 matched with the threaded hole 15, so that the locking cap 13 is screwed into the threaded hole 15 through the threaded section 131 and is locked with the threaded hole 15 in a threaded manner; the lower portion of the locking cap 13 may be a polish rod 132 that facilitates quick guiding of the locking cap 13 into the threaded bore 15.
At this time, the implantation procedure of the femoral intramedullary nail fixation system of the present invention may be referred to as follows:
when the screw is used, the main screw 1 can be firstly held by using a surgical tool, the treated femoral marrow cavity is implanted, then the tool is used for holding the inclined tension screw 2 to pass through the first screw hole 11 on the main screw 1 for installing the inclined tension screw 2, the inclined tension screw 2 is adjusted to enable the first through hole 22 at the rod part of the inclined tension screw 2 to be matched with the axial communication hole 14 in the main screw 1, then the tool is used for holding the transverse tension screw 3 to be screwed into the second screw hole 12 on the main screw 1 for accommodating the transverse tension screw 3 and pass through the third screw hole 21 on the inclined tension screw 2, the transverse tension screw 3 is adjusted to enable the second through hole 31 at the rod part of the transverse tension screw 3 to be matched with the axial communication hole 14 in the main screw 1, the tool is used for holding the fixing rod 4 to sequentially pass through the second through hole 31, the axial communication hole 14 and the first through hole 22, and finally the tool is used for holding the locking cap 13 to be installed at the tail part of the main screw 1, and the implantation is completed.
A fixed gasket 41 can be arranged between the lock cap 13 and the fixed rod 4, compared with the prior art, the lock cap 13 is in surface contact with the fixed gasket 41, and the fixed gasket 41 can play a role of a locking gasket in the locking process of the lock cap 13, so that the lock cap 13 is prevented from loosening.
Further, in order to facilitate the installation of the fixing spacer 41, the fixing spacer 41 and the fixing rod 4 are preferably in an integral structure (i.e. the fixing spacer 41 is fixed at the upper end of the fixing rod 4), the bottom of the fixing spacer 41 may be in different shapes such as a plane, an inclined plane or a groove, and may be pressed on the first external thread 32 of the rod portion of the transverse tension screw 3 (as shown in fig. 3) or may be non-contacted (as shown in fig. 2), because the transverse tension screw 3 is screwed in the second nail hole 12 of the main nail 1 through the first external thread 32 of the rod portion, and the fixing rod 4 passes through the second through hole 31 of the transverse tension screw 3, so that the fixing rod cannot rotate circumferentially, thereby realizing the locking of the transverse tension screw 3.
As shown in fig. 10, the lag screw 2 may include a shank 23 and a tail cap 24 located at the tail end of the shank 23, the tail cap 24 has a diameter larger than that of the shank 23, a step (not shown) matching with the end face of the tail cap 24 is provided in the first nail hole 11 of the main nail 1 for installing the lag screw 2, so that the end face of the tail cap 24 is abutted against the step to form a surface contact, which is stronger than a point contact, at this time, the screw 2 is continuously screwed by an instrument, the threaded section 25 of the head (right end in the drawing) of the lag screw 2 tightens the femoral head, pressurizes the fracture line M, and the lag screw 2 does not reversely rotate when the instrument is removed, so that the fracture line M is not in danger of re-opening. The lag screw 2 is preferably a clearance fit with the first screw hole 11 in the main screw 1 for receiving the lag screw 2, and the pressure of the lag screw 2 against the lateral tension screw 3 can be adjusted to provide a more even force distribution. The diameter direction of the step does not exceed the central line of the first nail hole 11, so that the step arrangement is prevented from causing the progressive reduction of the thickness of the main nail 1 corresponding to the central line position of the first nail hole 11, and the strength of the main nail 1 is effectively ensured.
Intramedullary nail operation requires that the tail end of the tail cap of the lag screw is flush with the outer side of the femoral shaft, and if the tail cap is deeply penetrated into the femoral shaft, bone can grow into the bone in the fracture healing process, so that the nail is difficult to take; if the femoral shaft leaks out, its outer slope may damage the lateral muscles. To avoid this problem, as shown in fig. 2 and 10, the tail end of the tail cap 24 of the lag screw 2 is preferably a slope 241, and the angle α between the slope 241 and the axis of the lag screw 2 is preferably 30-70 degrees, specifically 30 degrees, 45 degrees, 50 degrees, 70 degrees, etc. to match the inclination angle of the femoral shaft.
In order to conveniently select the tail cap 24 with a proper length according to the diameters of the femoral shafts of different people so as to be just flush with the outer sides of the femoral shafts, the tail cap 24 of the lag screw 2 can be designed as a separated tail cap, and specifically can be detachably connected to the nail body 23 of the lag screw 2 through the fixing nails 26, and the specific structure of fixing the tail cap 24 on the nail body 23 through the fixing nails 26 can adopt a conventional structure in the field and is not repeated herein.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (9)
1. The femoral intramedullary nail fixing system is characterized by comprising a main nail, a lag screw and a transverse tension screw, wherein a first nail hole for accommodating the lag screw and a second nail hole for accommodating the transverse tension screw are respectively arranged on the main nail, a third nail hole for accommodating the transverse tension screw is arranged on the lag screw, the transverse tension screw is in clearance fit with the third nail hole, an internal thread is arranged on the second nail hole, and a first external thread matched with the internal thread is arranged on the rod part of the transverse tension screw;
the main nail is internally provided with an axial communication hole communicated with the first nail hole and the second nail hole, a vertical first through hole is formed in the rod part of the oblique tension screw in the first nail hole, a vertical second through hole is formed in the rod part of the transverse tension screw in the second nail hole, and a fixing rod is arranged in the axial communication hole, the first through hole and the second through hole in a penetrating manner;
the diameter of the axial communication hole is larger than the diameter of the fixing rod, and the diameter of the first through hole is equal to the diameter of the fixing rod.
2. The femoral intramedullary nail fixation system of claim 1, wherein the internal threads are located in a middle portion of the second nail hole, both ends of the second nail hole being smooth holes.
3. The femoral intramedullary nail fixation system of claim 2, wherein the diameter of the unthreaded bore is greater than the diameter of the internal thread.
4. The femoral intramedullary nail fixation system of claim 1, wherein the head of the lateral tension screw is provided with a second external thread, the second external thread being cancellous bone thread, the first external thread being a locking thread, wherein:
the pitch of the first external thread is equal to the pitch of the second external thread;
or the pitch of the first external thread is smaller than that of the second external thread;
or, the pitch of the first external thread close to the head of the transverse tension screw is equal to that of the second external thread, and the pitch of the first external thread gradually decreases from the head to the tail of the transverse tension screw.
5. The femoral intramedullary nail fixation system of claim 1, wherein the shaft of the transverse tension screw comprises a first shaft at the tail and a second shaft at the head, the first shaft having a diameter greater than a diameter of the second shaft, the first external thread being located on the first shaft.
6. The femoral intramedullary nail fixation system of claim 1, wherein the second throughbore is an oblong hole.
7. The femoral intramedullary nail fixation system of claim 1, further comprising a locking cap, wherein a threaded hole is formed in the end face of the tail portion of the main nail and is in communication with the second nail hole, the locking cap is in threaded connection with the threaded hole, and the locking cap can be abutted against the fixing rod.
8. The femoral intramedullary nail fixation system of claim 7, wherein a fixation washer is disposed between the locking cap and the fixation rod;
and/or, the third nail hole is a slotted hole.
9. The femoral intramedullary nail fixation system of any one of claims 1 to 5, wherein the lag screw includes a shank and a tail cap at a tail end of the shank, the tail cap having a diameter greater than a diameter of the shank, a first nail hole on the main nail for mounting the lag screw being provided with a step mating with an end face of the tail cap, the step having a diameter not exceeding a centerline of the first nail hole.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110930471.2A CN113729903B (en) | 2021-08-13 | 2021-08-13 | Femoral intramedullary nail fixation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110930471.2A CN113729903B (en) | 2021-08-13 | 2021-08-13 | Femoral intramedullary nail fixation system |
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| CN113729903A CN113729903A (en) | 2021-12-03 |
| CN113729903B true CN113729903B (en) | 2023-06-27 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010000104A (en) * | 2008-06-18 | 2010-01-07 | Tetsuo Nakano | Intramedullary nail and intramedullary nail body |
| CN203263518U (en) * | 2013-05-13 | 2013-11-06 | 张志山 | Proximal femur cross-locking type intramedullary nail |
| CN206026410U (en) * | 2016-07-05 | 2017-03-22 | 梁兴斌 | Upper arm bone near -end coaptation board |
| CN108742810A (en) * | 2018-07-03 | 2018-11-06 | 张殿英 | A kind of anti-rotation intramedullary nail system of near end of thighbone |
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| CN113729903A (en) | 2021-12-03 |
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