Auxiliary screw inserter for minimally invasive cruciate ligament reconstruction under arthroscopy

Abstract

The present invention relates to an auxiliary screw driver for arthroscopic minimally invasive cruciate ligament reconstruction, belonging to the technical field of medical devices, including a screw, a screw driving mechanism and a locking and clamping mechanism, wherein the screw driving mechanism includes a driving rod and a twisting rod, wherein the twisting rod includes a connecting block and a power-assisting arm symmetrically arranged on the left and right sides of the connecting block, wherein the connecting block is provided with a fixing hole, wherein an annular cavity is arranged inside the driving rod, wherein the locking and clamping mechanism includes an outer driving sleeve, an inner sliding sleeve and a clamping piece, wherein the outer driving sleeve is sleeved on the driving rod, wherein the inner sliding sleeve slides in the annular inner cavity, wherein the outer driving sleeve is fixedly connected to the inner sliding sleeve, wherein the inner sliding sleeve is provided with a driving cone, wherein the driving arm is provided with a matching cone matched with the driving cone. The present invention can make the clamping piece clamped in the clamping groove inside the screw during operation, and never disengage, thereby preventing the joint cavity from being damaged under any circumstances, thereby solving the problem of damaging the joint cavity in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, in particular to an auxiliary screw inserter for minimally invasive cruciate ligament reconstruction under arthroscopy. Background Art

[0002] During arthroscopic minimally invasive cruciate ligament reconstruction, the screws that fix the ligaments on the femoral or tibial side are fixed with a screwdriver. However, most of the current screwdrivers are prone to slipping when they are held in the hand and rotated with force, causing the fixed position to shift, injuring the internal tissues of the joint cavity, puncturing the tunnel wall, etc., and even causing postoperative pain and intercondylar fossa impact, which ultimately leads to prolonged operation time and increased difficulty of the operation, and in severe cases may cause the failure of the entire operation.

[0003] At the same time, there is no special labor-saving measure in this operation. During the long-term holding process, the hands are easily tired, which affects the efficiency and quality of nailing.

[0004] Therefore, it is necessary to propose a new nailing device to address the above problems, which can ensure that the driving end will not be separated from the screw during nailing, thereby not causing damage to the joint cavity. On the other hand, an assisting structure is added to make the screwing operation labor-saving. Summary of the invention

[0005] In view of this, the purpose of the present invention is to propose an auxiliary screw inserter for arthroscopic minimally invasive cruciate ligament reconstruction. Through special design, the screwed-in driving end will not detach from the screw, thereby not causing damage to the joint cavity, so as to solve the problem of the prior art that it is easy to fall off and thus damage the joint cavity.

[0006] The present invention is achieved through the following technical solutions:

[0007] An auxiliary screw driver for minimally invasive cruciate ligament reconstruction under arthroscopy comprises a screw, a screw driving mechanism and a locking mechanism, wherein the screw driving mechanism comprises a driving rod and a twisting rod, wherein the driving rod is vertically arranged and the twisting rod is horizontally arranged, wherein the driving rod comprises a driven end plugged in and connected to an inner hole of the screw and a driving end plugged in and connected to a middle area of ​​the twisting rod, and a light rod section arranged between the driven end and the driving end, wherein the twisting rod comprises a connecting block and power-assisting arms symmetrically arranged on the left and right sides of the connecting block, wherein the connecting block is provided with a fixing hole matched with the top end of the driving rod, wherein an annular cavity is arranged in the driving rod, and wherein the annular cavity is provided with a plurality of holes along the circumferential direction. A long groove running through the axial direction, the locking and engaging mechanism comprises an outer driving sleeve, an inner sliding sleeve and a locking piece, the outer driving sleeve is fitted on the driving rod, the inner sliding sleeve slides in the annular inner cavity, the outer driving sleeve and the inner sliding sleeve are fixedly connected by multiple connecting screws passing through the long groove, multiple locking pieces are provided, and are evenly arranged on the same circumference in the annular cavity, and a through hole for the locking piece to extend out of the driving rod is provided at a corresponding position of the driving rod, a driving arm is provided at the tail of any locking piece, a driving cone is provided at the end of the inner sliding sleeve, which contacts the driving arm and drives the locking piece to extend, and a matching cone matching the driving cone is provided on the driving arm.

[0008] Furthermore, a return spring is provided between the engaging piece and the driving arm.

[0009] Furthermore, the locking and engaging mechanism further comprises an outer locking sleeve, and the outer locking sleeve is threadably matched with the driving rod and the outer driving sleeve respectively.

[0010] Furthermore, a locking piece guide sleeve is provided at the through hole.

[0011] Furthermore, the screw is configured as a hexagonal hole, and a bottom of the hexagonal hole is provided with a snap-fitting groove for snap-fitting and fixing with a snap-fitting piece.

[0012] Furthermore, the engaging piece includes a metal head and an elastic rod to which the metal head is bonded and fixed.

[0013] Furthermore, the front end of the metal head is provided with a conical tip, and the rear end of the metal head is provided with an anti-slip shoulder.

[0014] Furthermore, the driving arm is sleeved with an anti-slip sleeve.

[0015] Furthermore, a pulling rod is arranged on the outer driving sleeve.

[0016] The beneficial effects of the present invention are:

[0017] The present invention saves effort in operation through the assist arm of the screw driving mechanism, and the locking mechanism allows the locking piece to be locked in the slot inside the screw during operation and never disengage, thereby preventing the joint cavity from being damaged under any circumstances, thereby solving the problems of damage to the joint cavity and laborious operation in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of the present invention;

[0019] Figure 2 It is a front view of the present invention;

[0020] Figure 3 It is a left side view of the present invention;

[0021] Figure 4 It is a right side view of the present invention;

[0022] Figure 5 is a cross-sectional view of the driving rod;

[0023] Figure 6 for Figure 5 Schematic diagram when in locked state;

[0024] Figure 7 for Figure 5 A local enlarged view at A;'

[0025] Figure 8 is a cross-sectional view of the screw;

[0026] Fig. 9 It is a schematic diagram of the clamping state of the screw and the locking piece.

[0027] Description of reference numerals:

[0028] 1-screw; 2-screw drive mechanism; 3-locking and engaging mechanism; 4-driving rod; 5-twisting rod; 6-driven end; 7-driving end; 8-light rod section; 9-connecting block; 10-boosting arm; 11-long groove; 12-outer driving sleeve; 13-inner sliding sleeve; 14-engaging piece; 15-driving arm; 16-driving cone; 17-matching cone; 18-metal head; 19-elastic rod; 20-reset spring; 21-outer locking sleeve; 22-engaging piece guide sleeve; 23-anti-slip shoulder; 24-anti-slip sleeve; 25-pull rod; 26-connecting screw; 27-annular cavity; 28-engaging groove. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the above description of the present invention, it should be noted that the terms "one side", "the other side", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, the term "same" does not mean that the parts must be absolutely the same, but slight differences are allowed. The term "vertical" only means that the positional relationship between the parts is more vertical than "parallel", and does not mean that the structure must be completely vertical, but can be slightly tilted.

[0034] like Figure 1-9As shown, an embodiment of the present invention is: an auxiliary screw driver for minimally invasive cruciate ligament reconstruction under arthroscopy, comprising a screw 1, a screw driving mechanism 2 and a locking and engaging mechanism 3, the screw driving mechanism comprising a driving rod 4 and a twisting rod 5, the driving rod is vertically arranged, and the twisting rod is horizontally arranged, the driving rod comprises a driven end 6 plugged into the inner hole of the screw and a driving end 7 plugged into the middle area of ​​the twisting rod, and a light rod section 8 arranged between the driven end and the driving end, the twisting rod comprises a connecting block 9 and assisting arms 10 symmetrically arranged on the left and right sides of the connecting block, the assisting arms are arranged at different lengths to achieve different labor-saving effects, the connecting block is provided with a fixing hole, the fixing hole is a blind hole, and its shape is usually square Or hexagonal, the driving end is also provided with a square head with the same fixing hole, which is slightly smaller in size and can be inserted. In particular, an annular cavity is arranged in the driving rod, and the annular cavity is provided with a plurality of long grooves 11 penetrating along the axial direction in the circumferential direction. The inner cavity can be seen through the long grooves. The locking and engaging mechanism includes an outer driving sleeve 12, an inner sliding sleeve 13 and an engaging piece 14. The outer driving sleeve is fitted on the driving rod and is located in the area of ​​the long grooves. The inner sliding sleeve slides in the annular inner cavity. The outer driving sleeve and the inner sliding sleeve are fixed by connecting screws 26. The number of connecting screws is consistent with that of long grooves, that is, there are as many connecting screws as there are long grooves, so as to achieve multiple fixations, so that the force is evenly distributed when the inner sliding sleeve is pulled downward. In this embodiment, multiple locking pieces are provided and are evenly arranged on the circumference of the same cross section in the annular cavity. A through hole is provided at the position corresponding to the driving rod so that the head of the locking piece can extend out of the driving rod, and a driving arm 15 is provided at the tail of any locking piece. A driving cone 16 is provided at the end of the inner sliding sleeve for contacting with the driving arm to drive the locking piece to extend. A matching cone 17 matching with the driving cone is provided on the driving arm. When the inner sliding sleeve slides down under the action of the outer driving sleeve, the driving cone acts on the matching cone of the driving arm, so that the locking piece extends from the inside to the outside, and its head can extend out of the driving rod and engage in the inner hole of the screw.

[0035] In particular, the locking piece in this embodiment includes a metal head 18 and an elastic rod 19 bonded and fixed to the metal head. The metal head can be various ferrous metals, and the elastic rod can be a polyester rod, so that it has a certain rigidity and a certain elasticity. It can be elastically deformed under the action of external force, but it will not easily fall off from the inner hole of the screw.

[0036] The screw is set as a hexagonal hole. A better solution is to set a locking groove 28 for locking and fixing with the locking piece at the bottom of the hexagonal hole. By locking and fixing the locking groove with the locking piece, it is difficult to generate radial load under the action of external force, thus further improving the effect of preventing separation.

[0037] In this embodiment, a return spring 20 is provided between the engaging piece and the driving arm. After use, the engaging piece can be retracted under the restoring force of the return spring, thereby facilitating the driving rod to withdraw from the screw hole.

[0038] In this embodiment, the locking mechanism further includes an outer locking sleeve 21, which is threadedly matched with the drive rod and the outer driving sleeve. Specifically, the outer locking sleeve is provided with two-stage threads, the first-stage thread is threadedly connected with the drive rod, and the second-stage thread is threadedly connected with the outer driving sleeve. To ensure the same moving distance, the threads at the two connections need to have the same pitch.

[0039] In this embodiment, a locking piece guide sleeve 22 is provided at the through hole, and the moving track of the locking piece can be limited by the guide sleeve, so as to ensure the moving direction and extension amount of the locking piece to be uniform in all directions.

[0040] In this embodiment, the front end of the metal head is provided with a conical tip, which can easily enter the locking groove, and the tail end of the metal head is provided with an anti-slip shoulder 23, which is larger than the via diameter, thereby preventing transitional retraction, leaving no operating space for the driving cone.

[0041] In this embodiment, the driving arm is sleeved with an anti-slip sleeve 24, which can improve the reliability of holding, reduce vibration, and reduce the risk of the driving rod detaching from the screw hole.

[0042] In this embodiment, the outer drive sleeve is provided with a pull rod 25. The pull rods are symmetrical, and the length of the pull rods can make it more convenient and labor-saving to pull the outer drive sleeve down.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An auxiliary screw inserter for minimally invasive cruciate ligament reconstruction under arthroscopy, comprising a screw, characterized in that: The screw drive mechanism also includes a screw driving mechanism and a locking mechanism, wherein the screw driving mechanism includes a driving rod and a twisting rod, the driving rod is vertically arranged, the twisting rod is horizontally arranged, the driving rod includes a driven end plugged into the inner hole of the screw and a driving end plugged into the middle area of ​​the twisting rod, and a light rod section arranged between the driven end and the driving end, the twisting rod includes a connecting block and power arms symmetrically arranged on the left and right sides of the connecting block, the connecting block is provided with a fixing hole matched with the top end of the driving rod, an annular cavity is arranged in the driving rod, and the annular cavity is provided with a plurality of long strip grooves penetrating along the axial direction in the circumferential direction, and the locking mechanism includes an outer driving sleeve, an inner sliding ... The movable sleeve and the locking piece, the outer driving sleeve is sleeved on the driving rod, the inner sliding sleeve slides in the annular inner cavity, the outer driving sleeve and the inner sliding sleeve are fixedly connected by a plurality of connecting screws passing through the long slots, a plurality of locking pieces are provided, and are evenly arranged on the same circumference in the annular cavity, and a through hole for the locking piece to extend out of the driving rod is provided at the corresponding position of the driving rod, a driving arm is provided at the tail of any locking piece, a driving cone is provided at the end of the inner sliding sleeve, which contacts the driving arm and drives the locking piece to extend, a matching cone is provided on the driving arm and matches the driving cone, a reset spring is provided between the locking piece and the driving arm, a locking piece guide sleeve is provided at the through hole, the screw is provided as an inner hexagonal hole, and a locking groove for locking and fixing with the locking piece is provided at the bottom of the inner hexagonal hole, and the locking piece includes a metal head and an elastic rod bonded and fixed to the metal head.

2. The auxiliary screw driver for arthroscopic minimally invasive cruciate ligament reconstruction according to claim 1, characterized in that The front end of the metal head is provided with a conical tip, and the rear end of the metal head is provided with an anti-slip shoulder.

3. The auxiliary screw driver for arthroscopic minimally invasive cruciate ligament reconstruction according to any one of claims 1-2, characterized in that : The driving arm is sleeved with an anti-slip sleeve.

4. The auxiliary screw driver for arthroscopic minimally invasive cruciate ligament reconstruction according to any one of claims 1-2, characterized in that : A pulling rod is arranged on the outer driving sleeve.

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