Dynamic Compression Hip Screw Fixation System

Abstract

The present invention relates to the technical field of medical upper instruments, and in particular to a dynamic compression hip screw fixation system, comprising a steel plate, a locking sleeve, a lag screw, a compression screw and a locking device, wherein the steel plate is provided with a plurality of fixing holes for fixing the steel plate on the proximal femur shaft; the locking sleeve is fixed at the proximal end of the steel plate, and has an upper sleeve and a lower sleeve that are interconnected; the lag screw comprises a lag screw body and a lag screw thread portion, the lag screw body is provided with a plurality of teeth, the lag screw thread portion comprises a high-tooth thread and a low-tooth thread, and the high-tooth thread and the low-tooth thread are alternately arranged; the compression screw comprises a compression screw head and a compression screw thread portion; the lag screw is inserted into an upper sleeve, and the compression screw is inserted into a lower sleeve, so that the compression screw thread portion is meshed with the teeth, and the compression screw is locked by the locking device. The thread of the lag screw is an alternating structure of high-tooth thread and low-tooth thread, so that more bone tissue is embedded between the threads, which is conducive to improving stability.

Description

Technical Field

[0001] The invention relates to the technical field of medical upper apparatus, in particular to a dynamic compression hip screw fixation system. Background Art

[0002] Intertrochanteric fractures are common in elderly patients, and osteoporosis in the elderly is also a major cause of intertrochanteric fractures. Intertrochanteric fractures are one of the most common fractures in the elderly and have a high mortality rate. Early surgery helps reduce complications and lower patient mortality. There are many methods for treating intertrochanteric fractures, such as angle plate fixation, condylar plate fixation, goose head nail fixation, interlocking nail fixation, dynamic compression hip screw fixation, Richard nail plate system, etc. The diversity of treatment methods highlights the difficulty of treating this type of injury. Therefore, the correct treatment of intertrochanteric fractures in the elderly is an important issue that every orthopedic surgeon has to face.

[0003] Among the above methods, dynamic compression hip screw fixation is currently a more commonly used method in clinical practice. The dynamic compression hip screw consists of a sliding compression screw, a sleeve bone plate, a tail compression screw and a bone plate screw. The dynamic compression hip screw screw slides along the sleeve, exerting a dynamic follow-up compression effect on the fracture end, increasing the stability of the fracture and promoting fracture healing. However, it has been found in practical use that the existing dynamic compression hip screw fixation method is prone to screw withdrawal after implantation, and the stability needs to be further improved. Summary of the invention

[0004] In order to solve the problem that the existing dynamic compression hip screw fixation method is prone to screw backing out and has poor stability after implantation, the present invention provides a dynamic compression hip screw fixation system, including a steel plate, a locking sleeve, a tension screw, a compression screw and a locking device. After the tension screw is inserted into the upper sleeve, the compression screw is screwed in from the lower sleeve, and the tension screw is pressurized by the cooperation between the thread of the compression screw and the teeth of the tension screw, and the compression screw is locked by the locking device to achieve fixation of the tension screw and the compression screw, wherein the thread of the tension screw is a structure in which high-tooth threads and low-tooth threads are alternately arranged, so that more bone tissue can be embedded between the threads, thereby facilitating improved stability.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A dynamic compression hip screw fixation system, comprising

[0007] A steel plate, wherein the steel plate is provided with a plurality of fixing holes for fixing the steel plate to the shaft of the proximal femur;

[0008] A locking sleeve, which is fixed to the proximal end of the steel plate and has an upper sleeve and a lower sleeve that are connected to each other;

[0009] A lag screw, the lag screw comprising a lag screw body and a lag screw thread portion, the lag screw body being provided with a plurality of teeth, the lag screw thread portion comprising a high-tooth thread and a low-tooth thread, the high-tooth thread and the low-tooth thread being arranged alternately;

[0010] a compression screw including a compression screw head and a compression screw threaded portion; and

[0011] Locking device;

[0012] The tension screw is inserted into the upper sleeve, and the pressure screw is inserted into the lower sleeve, so that the threaded portion of the pressure screw is meshed with the teeth, and the pressure screw is locked by a locking device.

[0013] Preferably, the locking device comprises a locking screw hole arranged on the steel plate near the lower sleeve and a locking screw threaded in the locking screw hole, wherein the thread of the locking screw contacts the edge of the pressure screw head to lock the pressure screw in the lower sleeve.

[0014] Preferably, the locking screw is rotated counterclockwise to be screwed into the locking screw hole, and is rotated clockwise to be screwed out of the locking screw hole.

[0015] Preferably, the tension screw body has an arc-shaped groove on the side where the teeth are provided, which facilitates the engagement of the threaded portion of the pressure screw with the teeth.

[0016] Preferably, the arc-shaped groove extends to a portion of the lag screw thread portion, so that an end of the lag screw thread portion away from the lag screw body has at least one complete circle of high-tooth thread.

[0017] Preferably, the length of the threaded portion of the lag screw is 2-5 cm.

[0018] Preferably, the compression screw is 3-8 mm shorter than the tension screw.

[0019] Preferably, the above-mentioned dynamic compression hip screw fixation system also includes a gripper for holding the steel plate, the gripper includes a guide sleeve, a gripping portion arranged at the proximal end of the guide sleeve and a gripping handle arranged at the distal end of the guide sleeve, the guide sleeve includes an upper guide sleeve corresponding to the upper sleeve and a lower guide sleeve corresponding to the lower sleeve; a through hole 1 and a plurality of through holes 2 are provided on the wall of the guide sleeve, the through hole 1 is closer to the gripping portion, a matching hole 1 and a plurality of matching holes 2 are provided on the gripping handle, the matching hole 2 is closer to the guide sleeve; the axes of the through hole 1, matching hole 1 and the locking screw hole coincide, and the axes of the through hole 2, matching hole 2 and the fixing hole coincide; the gripper grips the steel plate through the gripping portion. Preferably, the above-mentioned gripping portion includes two symmetrically arranged gripping claws, and gripping grooves arranged along the longitudinal direction of the steel plate are provided on both sides of the steel plate, and the gripping claws can slide back and forth in the gripping grooves.

[0020] Preferably, the width of the holding groove is greater than the width of the holding claw, so that the holding claw has a certain degree of mobility in the holding groove.

[0021] Preferably, the above-mentioned holder is provided with an upper instrument locking hole 1 above the entrance of the upper guide sleeve for locking the upper instrument passing through the upper guide sleeve.

[0022] Preferably, the above-mentioned superior instrument includes an superior instrument head, an superior instrument guide rod and an superior instrument locking bolt, the superior instrument guide rod has a hollow structure that is convenient for inserting a guide needle, the superior instrument head is provided with an superior instrument locking hole 2, the superior instrument locking bolt includes a bolt head and a screw rod, the screw rod passes through the superior instrument locking hole 2 and is threadedly connected with the superior instrument locking hole 1 to lock the superior instrument on the holder.

[0023] Preferably, the upper instrument guide rod and the upper instrument head have an arc groove 2 on the side facing the lower guide sleeve to avoid obstruction to the lower guide sleeve.

[0024] The beneficial effects of the present invention are:

[0025] (1) The dynamic compression hip screw fixation system of the present invention comprises a steel plate, a locking sleeve, a tension screw, a compression screw and a locking device. After the tension screw is inserted into the upper sleeve, the compression screw is screwed in from the lower sleeve. The tension screw is pressurized by the cooperation between the thread of the compression screw and the teeth of the tension screw, and the compression screw is locked by the locking device to achieve the fixation of the tension screw and the compression screw. The thread of the tension screw is a structure in which high-tooth thread and low-tooth thread are alternately arranged, so that more bone tissue can be embedded between the threads, thereby facilitating the improvement of stability.

[0026] (2) The present invention is also provided with a special insertion holder, which holds the steel plate through the holder, and inserts the steel plate fixing screws, tension screws and pressure screws through the holder, and adjusts the locking screw through the holder to lock the pressure screw. The holder holds the steel plate through the cooperation between the holding claw and the holding groove on the side wall of the steel plate. During the operation, it is only necessary to control the holder without applying additional force, so that unnecessary damage to the surrounding tissues will not be caused due to improper force, and the operation is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is a structural schematic diagram of a dynamic compression hip screw fixation system with a holder of the present invention;

[0030] Figure 3 It is a schematic structural diagram of the lag screw of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of the pressure screw of the present invention;

[0032] Figure 5 is a schematic structural diagram of a locking screw of the present invention;

[0033] Figure 6 It is a schematic diagram of the structure of the holder of the present invention;

[0034] Figure 7 yes Figure 6 Enlarged view of part a;

[0035] Figure 8 is a stereoscopic view of the gripper of the present invention (showing the upper instrument locking hole 1);

[0036] Fig. 9 It is a structural schematic diagram of the upper device of the present invention;

[0037] Fig.10 It is a structural schematic diagram of the lower device of the present invention;

[0038] In the figure: 1. steel plate; 11. fixing hole; 12. holding groove; 2. locking sleeve; 21. upper sleeve; 22. lower sleeve; 3. tension screw; 31. tension screw body; 311. teeth; 312. arc groove 1; 32. tension screw thread; 321. high-tooth thread; 322. low-tooth thread; 4. pressure screw; 41. pressure screw head; 42. pressure screw thread; 5. locking device; 51. locking screw; 61. guide sleeve; 611. upper guide sleeve; 612. lower guide sleeve; 613. through hole 1; 614. through hole 2; 62. holding part; 621. holding claw; 63. upper instrument locking hole 1; 631. matching hole 1; 632. matching hole 2; 64. Upper instrument locking hole 1; 7. Upper instrument; 71. Upper instrument head; 72. Upper instrument guide rod; 721. Arc groove 2; 731. Bolt head; 732. Screw rod; 8. Lower instrument; 81. Lower instrument head; 82. Lower instrument guide rod; 821. Arc groove 3. DETAILED DESCRIPTION

[0039] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0040] A dynamic compression hip screw fixation system, such as Figure 1-4 As shown, it includes a steel plate 1, a locking sleeve 2, a tension screw 3, a compression screw 4 and a locking device 5; the steel plate 1 is provided with a plurality of fixing holes 11 for fixing the steel plate 1 on the proximal femur shaft; the locking sleeve 2 is fixed to the proximal end of the steel plate 1, and has an upper sleeve 21 and a lower sleeve 22 which are connected to each other; the tension screw 3 includes a tension screw body 31 and a tension screw threaded portion 32, the tension screw body 31 is provided with a plurality of teeth 311, the tension screw threaded portion 32 includes a high-tooth thread 321 and a low-tooth thread 322, and the high-tooth thread 321 and the low-tooth thread 322 are alternately arranged; the compression screw 4 includes a compression screw head 41 and a compression screw threaded portion 42; the tension screw 3 is inserted into the upper sleeve 21, and the compression screw 4 is inserted into the lower sleeve 22, so that the compression screw threaded portion 42 is engaged with the teeth 311, and the compression screw 4 is locked by the locking device 5.

[0041] The thread of the tension screw 3 is a structure in which high-tooth threads 321 and low-tooth threads 322 are alternately arranged, so that more bone tissue can be embedded between the threads, which is conducive to improving stability.

[0042] In a specific embodiment, Figure 1 and Figure 5As shown, the locking device 5 includes a locking screw hole arranged on the steel plate 1 near the lower sleeve 22 and a locking screw 51 screwed in the locking screw hole. The thread of the locking screw 51 contacts the edge of the pressure screw head 41 to lock the pressure screw 4 in the lower sleeve 22.

[0043] In a specific implementation, the locking screw 51 rotates counterclockwise to be screwed into the locking screw hole, and rotates clockwise to be screwed out of the locking screw hole.

[0044] In a specific embodiment, Figure 3 As shown, the tension screw body 31 has an arc groove 312 on the side where the teeth 311 are provided, which facilitates the engagement of the pressure screw threaded portion 42 with the teeth 311.

[0045] In a specific embodiment, Figure 3 As shown, the arc groove 1 312 extends to part of the tension screw thread portion 32, so that the end of the tension screw thread portion 32 away from the tension screw body 31 has at least one complete circle of high-tooth thread 321. The end retains at least one complete circle of high-tooth thread 321, which is conducive to blocking the pressure screw and preventing the pressure screw from extending too much.

[0046] In a specific embodiment, the length of the lag screw threaded portion 32 is 2-5 cm.

[0047] In a specific embodiment, the compression screw 4 is 3-8 mm shorter than the tension screw 3 .

[0048] In a specific embodiment, Figure 2 , Figure 6 and Figure 8 As shown, the dynamic compression hip screw fixation system also includes a holder for holding the steel plate 1, the holder includes a guide sleeve 61, a holding portion 62 arranged at the proximal end of the guide sleeve 61 and a holding handle 63 arranged at the distal end of the guide sleeve 61, the guide sleeve 61 includes an upper guide sleeve 611 corresponding to the upper sleeve 21 and a lower guide sleeve 612 corresponding to the lower sleeve 22; a through hole 1 613 and a plurality of through holes 2 614 are provided on the wall of the guide sleeve 61, the through hole 1 613 is closer to the holding portion 62, a matching hole 1 631 and a plurality of matching holes 2 632 are provided on the holding handle 63, the matching hole 2 632 is closer to the guide sleeve 61; the axes of the through hole 1 613, the matching hole 1 631 and the locking screw hole coincide, and the axes of the through hole 2 614, the matching hole 2 632 and the fixing hole 11 coincide; the holder holds the steel plate 1 through the holding portion 62.

[0049] The steel plate 1 is held with a holder. When the steel plate 1 reaches the desired position, the guide pin is passed through the second matching hole 632 on the holding handle 63, the second through hole 614 on the guide sleeve 61 and the fixing hole 11 on the steel plate 1 in sequence, and holes are drilled. Then, the fixing screw is inserted into the fixing hole through this passage to fix the steel plate 1 on the proximal femoral shaft. Then, the tension screw 3 is inserted through the upper guide sleeve 611 of the guide sleeve 61 and the upper sleeve 21 of the locking sleeve 2 (the holes are drilled before the screws are inserted, and the description is omitted here). ), and insert the pressure screw 4 through the lower guide sleeve 612 of the guide sleeve 61 and the lower sleeve 22 of the locking sleeve 2 (drill a hole before inserting the screw, the description is omitted here), and finally insert a screwdriver through the matching hole 631 on the holding handle 63 and the through hole 613 on the guide sleeve 61 in turn, and rotate the locking screw 51 clockwise to make the locking screw 51 partially screw out of the locking screw hole, so that the thread of the locking screw 51 contacts the edge of the pressure screw head 41, and the pressure screw 4 is locked in the lower sleeve 22.

[0050] In a specific embodiment, Figure 2 and Figure 7 As shown, the holding portion 62 includes two symmetrically arranged holding claws 621 , and holding grooves 12 arranged along the longitudinal direction of the steel plate 1 are provided on both sides of the steel plate 1 , and the holding claws 621 can slide back and forth in the holding grooves 12 .

[0051] In a specific embodiment, the width of the holding groove 12 is greater than the width of the holding claw 621, so that the holding claw 621 has a certain degree of mobility in the holding groove 12. In a specific embodiment, the width of the holding groove 12 can be slightly greater than the width of the holding claw 621 to avoid curling during the placement of the steel plate 1, which may cause the gripper to be unable to withdraw.

[0052] In a specific embodiment, Figure 8 As shown, the holder is provided with an upper instrument locking hole 64 above the entrance of the upper guide sleeve 611 for locking the upper instrument 7 passing through the upper guide sleeve 611 .

[0053] In a specific embodiment, Fig. 9 As shown, the upper instrument 7 includes an upper instrument head 71, an upper instrument guide rod 72 and an upper instrument locking bolt. The upper instrument guide rod 72 has a hollow structure that is convenient for inserting a guide needle. The upper instrument head 71 is provided with an upper instrument locking hole 2. The upper instrument locking bolt includes a bolt head 731 and a screw rod 732. The screw rod 732 passes through the upper instrument locking hole 2 and is threadedly connected with the upper instrument locking hole 1 64 to lock the upper instrument 7 on the holder.

[0054] The upper instrument guide rod 72 of the upper instrument 7 is inserted into the upper guide sleeve 611 of the holder and the upper sleeve 21 of the locking sleeve 2 in sequence, and the upper instrument 7 is locked in the upper instrument locking hole 64 by the screw 732, and then holes are drilled in sequence through the lower guide sleeve 612 of the holder and the lower sleeve 22 of the locking sleeve 2 for inserting the pressure screw 4.

[0055] In a specific embodiment, Fig. 9 As shown, the upper instrument guide rod 72 and the upper instrument head 71 have an arc groove 721 on the side facing the lower guide sleeve 612 to avoid obstruction to the lower guide sleeve 612.

[0056] In a specific embodiment, Fig.10 As shown, there is also a lower instrument 8, which includes a lower instrument head 81 and a lower instrument guide rod 82. The lower instrument guide rod 82 has an arc groove 3 821 on the side facing the upper guide sleeve 611 to avoid obstruction to the upper guide sleeve 611.

[0057] In a specific embodiment, Fig.10 As shown, the lower instrument 8 may also be provided with a lower instrument locking bolt on the lower instrument head 81, and a lower instrument locking hole may be provided below the entrance of the lower guide sleeve 612 of the holder to lock the lower instrument 8 passing through the lower guide sleeve 612. After the lower instrument guide rod is inserted, a hole may be drilled through the upper guide sleeve 611 and the upper sleeve 21 to insert the lag screw 3.

[0058] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A dynamic compression hip screw fixation system, characterized in that: include A steel plate (1), wherein the steel plate (1) is provided with a plurality of fixing holes (11) for fixing the steel plate (1) to the proximal femoral shaft; A locking sleeve (2), the locking sleeve (2) being fixed to the proximal end of the steel plate (1), and comprising an upper sleeve (21) and a lower sleeve (22) which are interconnected; A lag screw (3), the lag screw (3) comprising a lag screw body (31) and a lag screw thread portion (32), the lag screw body (31) being provided with a plurality of teeth (311), the lag screw thread portion (32) comprising a high-tooth thread (321) and a low-tooth thread (322), the high-tooth thread (321) and the low-tooth thread (322) being arranged alternately; A pressure screw (4), the pressure screw (4) comprising a pressure screw head (41) and a pressure screw threaded portion (42); and Locking device (5); The tension screw (3) is inserted into the upper sleeve (21), and the pressure screw (4) is inserted into the lower sleeve (22), so that the threaded portion (42) of the pressure screw is meshed with the teeth (311), and the pressure screw (4) is locked by the locking device (5); The invention also comprises a holder for holding the steel plate (1), the holder comprising a guide sleeve (61), a holding portion (62) arranged at the proximal end of the guide sleeve (61), and a holding handle (63) arranged at the distal end of the guide sleeve (61), the guide sleeve (61) comprising an upper guide sleeve (611) corresponding to the upper sleeve (21) and a lower guide sleeve (612) corresponding to the lower sleeve (22); a first through hole (613) and a plurality of second through holes (614) are provided on the wall of the guide sleeve (61). ), the through hole one (613) is closer to the holding portion (62), the holding handle (63) is provided with a matching hole one (631) and a plurality of matching holes two (632), the matching holes two (632) are closer to the guide sleeve (61); the axes of the through hole one (613), matching hole one (631) and the locking screw hole coincide, and the axes of the through hole two (614), matching hole two (632) and the fixing hole (11) coincide; the holder holds the steel plate (1) through the holding portion (62); The holding portion (62) comprises two holding claws (621) arranged symmetrically, and holding grooves (12) arranged longitudinally along the steel plate (1) are provided on both sides of the steel plate (1), and the holding claws (621) can slide back and forth in the holding grooves (12); The tension screw body (31) has an arc-shaped groove (312) on the side provided with the teeth (311) for facilitating meshing of the pressure screw threaded portion (42) with the teeth (311).

2. The dynamic compression hip screw fixation system according to claim 1, characterized in that: The locking device (5) comprises a locking screw hole provided on the steel plate (1) near the lower sleeve (22) and a locking screw (51) screwed into the locking screw hole, wherein the thread of the locking screw (51) contacts the edge of the pressure screw head (41) to lock the pressure screw (4) into the lower sleeve (22).

3. The dynamic compression hip screw fixation system according to claim 2, characterized in that: The locking screw (51) is rotated counterclockwise to be screwed into the locking screw hole, and is rotated clockwise to be screwed out of the locking screw hole.

4. The dynamic compression hip screw fixation system according to claim 1, characterized in that: The arc-shaped groove 1 (312) extends to a portion of the tension screw threaded portion (32), so that an end of the tension screw threaded portion (32) away from the tension screw body (31) has at least one complete circle of high-tooth threads (321).

5. The dynamic compression hip screw fixation system according to claim 1, characterized in that: The length of the lag screw threaded portion (32) is 2-5 cm.

6. The dynamic compression hip screw fixation system according to claim 1, characterized in that: The compression screw (4) is 3-8 mm shorter than the tension screw (3).

7. The dynamic compression hip screw fixation system according to claim 1, characterized in that: The width of the holding groove (12) is greater than the width of the holding claw (621), so that the holding claw (621) has a certain degree of mobility within the holding groove (12).

8. The dynamic compression hip screw fixation system according to claim 1, characterized in that: The holder is provided with an upper instrument locking hole (64) above the entrance of the upper guide sleeve (611), which is used to lock the upper instrument (7) passing through the upper guide sleeve (611).

9. The dynamic compression hip screw fixation system according to claim 8, characterized in that: The upper instrument (7) comprises an upper instrument head (71), an upper instrument guide rod (72) and an upper instrument locking bolt. The upper instrument guide rod (72) has a hollow structure for facilitating the insertion of a guide needle. The upper instrument head (71) is provided with an upper instrument locking hole 2. The upper instrument locking bolt comprises a bolt head (731) and a screw rod (732). The screw rod (732) passes through the upper instrument locking hole 2 and is threadedly connected to the upper instrument locking hole 1 (64) to lock the upper instrument (7) on the holder.

10. The dynamic compression hip screw fixation system according to claim 9, characterized in that: The upper instrument guide rod (72) and the upper instrument head (71) have an arc-shaped groove 2 (721) on the side facing the lower guide sleeve (612) to avoid obstruction to the lower guide sleeve (612).

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