Restoration tool for hallux valgus surgery

Abstract

The utility model relates to the field of medical apparatus and instruments, and particularly discloses a reduction tool for hallux valgus surgery, which comprises a base frame comprising an internal threaded hole, an operation space, an arc slideway, an arc through hole and a positioning needle hole; the sliding piece is installed on the base frame and can slide in the arc slide way, and the sliding piece comprises a reset needle hole; the positioning needle penetrates through the positioning needle hole, and the radial size of the positioning needle is the same as that of the positioning needle hole; the reset needle penetrates through the arc through hole, the reset needle hole and the inner threaded hole, and the radial size of the reset needle is the same as that of the reset needle hole; the positioning needle lock catch is arranged on the base frame, sleeves the positioning needle and is used for locking the base frame on the positioning needle in a removable manner; and the propelling bolt is sleeved outside the reduction needle and can be arranged in the internal threaded hole of the base frame from the operation space. The reduction tool can be used for safely and reliably reducing the hallux valgus angle, the included angle between the first metatarsal bone and the second metatarsal bone and the joint face angle at the far end of the first metatarsal bone, and the treatment effect of the hallux valgus minimally invasive surgery is improved.

Description

Technical Field

[0001] The embodiments of the utility model relate to the field of medical devices, and more specifically, to a reduction tool for hallux valgus surgery. Background Art

[0002] Minimally invasive surgery for hallux valgus is accepted by more and more patients due to its advantages of less trauma, less postoperative pain, early weight-bearing walking and aesthetics, and has once again attracted the attention of clinicians. Minimally invasive surgery for hallux valgus mainly consists of several main operations such as osteotomy, reduction, and internal fixation, and different or related instruments are often required in the implementation of each operation to ensure that each operation can be carried out safely and effectively.

[0003] In order to better assist doctors in completing minimally invasive hallux valgus surgery, the prior art provides a reduction tool, which is the core tool for implementing the reduction operation, and the use effect is related to the success rate of minimally invasive hallux valgus surgery. The relevant reduction tool is mainly composed of a hooked base frame, a push bolt and a traction needle, wherein the push bolt is arranged on the hooked base frame and allows the traction needle to pass through it. When in use, it is necessary to hook the hooked base frame into the bone marrow cavity of the proximal part of the first metatarsal at the osteotomy seam of the first metatarsal, rotate the hooked base frame so that the push bolt is roughly perpendicular to the distal truncated part of the first metatarsal, drive the traction needle passing through the push bolt into the distal truncated part of the first metatarsal, and then rotate the push bolt to push the distal truncated part of the first metatarsal toward the second metatarsal until the angle between the axis of the first metatarsal and the axis of the proximal phalanx of the first metatarsal (i.e., the hallux valgus angle) is reduced to the target range.

[0004] However, this reduction tool has the following defects: after the hooked base frame is hooked into the bone marrow cavity of the first metatarsal, it is easy to produce relative movement with respect to the first metatarsal, resulting in the pushing direction applied by the reduction tool to the distal truncated part of the first metatarsal being non-unique and variable, thereby affecting the correction effect of the reduction tool.

[0005] In addition, clinical medicine stipulates that if any of the hallux valgus angle, the angle between the first metatarsal axis and the second metatarsal axis, and the angle between the distal articular surface of the first metatarsal and the first metatarsal axis does not reach the target range, it can be determined as a deformity. Therefore, a complete and effective hallux valgus surgery requires that the above three angles be corrected to within the target range. However, the reduction tool described above can only achieve the translation of the distal truncated part of the first metatarsal, can only correct the angle between the first metatarsal axis and the second metatarsal axis, and partially correct the hallux valgus angle, and cannot achieve the complete correction of the three angles specified by the clinic, and therefore, cannot complete a complete and effective hallux valgus surgery. Utility Model Content

[0006] In order to solve one or more of the technical problems mentioned above, the utility model provides a reduction tool for hallux valgus surgery, which can quantitatively reduce the hallux valgus angle, the angle between the first metatarsal and the second metatarsal, and the distal articular surface angle of the first metatarsal, thereby improving the treatment effect of minimally invasive hallux valgus surgery.

[0007] According to the first aspect of the utility model, a reduction tool for hallux valgus surgery is provided, which comprises: a base frame, which comprises an internal threaded hole, an operating space, an arc slideway, and an arc through hole penetrating the arc slideway and a positioning pin hole arranged near the end of the arc slideway, wherein one end of the operating space is connected to the arc through hole, and the other end is connected to the internal threaded hole; a sliding member, which is installed on the base frame and can slide along the arc slideway, and the sliding member comprises a reduction pin hole; a positioning pin, which passes through the positioning pin hole and has the same radial size as the positioning pin hole; a reduction pin, which passes through the arc through hole, the reduction pin hole and the internal threaded hole, and has the same radial size as the reduction pin hole; a positioning pin lock buckle, which is arranged on the base frame and sleeved outside the positioning pin, for releasably locking the base frame on the positioning pin; and a push bolt, which sleeves outside the reduction pin and can be loaded into the internal threaded hole of the base frame from the operating space.

[0008] In an optional scheme, the reset tool also includes: a reset needle lock, which is provided on the sliding member and is sleeved outside the reset needle, and is used to releasably lock the reset needle on the sliding member; and a locking mechanism, which is provided on the sliding member and the base frame, and is used to releasably lock the sliding member at any position in the circular arc slideway on the base frame.

[0009] In an optional solution, the positioning pin lock comprises: a positioning pin embedding component, which is sleeved outside the positioning pin and comprises a fixed end fixed in the base frame and a locking end having a plurality of claws; and a positioning pin locking nut, which is sleeved outside the locking end of the positioning pin embedding component and is threadedly connected thereto; wherein a taper is provided at the mating point between the positioning pin locking nut and the locking end of the positioning pin embedding component, so that the positioning pin locking nut can selectively retract the plurality of claws when being rotated, and force the plurality of claws to engage the positioning pin. The reset needle lock comprises: a reset needle embedding component, which is sleeved outside the reset needle and comprises a fixed end fixed in the base frame and a locking end with a plurality of claws; and a reset needle locking nut, which is sleeved outside the locking end of the reset needle embedding component and is threadedly connected thereto; wherein a taper is provided at the mating position between the reset needle locking nut and the locking end of the reset needle embedding component, so that the reset needle locking nut can selectively retract the plurality of claws when being rotated, and force the plurality of claws to hold the reset needle.

[0010] In an optional solution, the locking mechanism includes a female threaded hole provided on the sliding member, and a locking bolt capable of passing through the circular arc through hole and being screwed into the female threaded hole.

[0011] In an optional solution, the base frame includes: an arc block portion, which has the arc slideway and the arc through hole; a support rod portion, which is connected to one end of the arc block portion and extends radially inward of the arc block portion; a flat portion, which is vertically connected to the end of the support rod portion away from the arc block portion and has the internal threaded hole; and a straight block portion, which is connected to the other end of the arc block portion and has the positioning pinhole. The arc block portion, the support rod portion and the flat portion together enclose the operating space.

[0012] In an optional solution, the geometric center line of the circular arc slideway, the geometric center line of the circular arc through hole, the center axis of the internal threaded hole and the center axis of the reset pinhole are coplanar.

[0013] In an optional scheme, the base frame also includes an avoidance notch provided on the flat portion and connected to the internal threaded hole, the push bolt includes a screw portion and an operating portion connected to the screw portion, the screw portion includes a threaded section, a connecting section and a pressing section gradually away from the operating portion, wherein the diameter of the connecting section is smaller than the diameter of the threaded section and the diameter of the pressing section, the width of the avoidance notch is larger than the diameter of the connecting section and smaller than the diameter of the screw portion, so that when the connecting section is in the avoidance notch, the operating portion and the threaded section are in the avoidance space, and the pressing section is outside the base frame.

[0014] In an optional solution, the base frame is made of aluminum alloy material.

[0015] In an optional solution, the circular arc slide has two openings respectively formed on both sides of the arc block portion, so that the sliding member can be installed into the circular arc slide through the openings.

[0016] In an optional solution, the sliding member is made of a polyetheretherketone / ceramic composite material.

[0017] In an optional solution, the base frame and / or the push bolt are provided with scales.

[0018] In the reduction tool for hallux valgus surgery provided above, the base frame can be preliminarily determined in its orientation relative to the big toe by means of a positioning pin and a reduction pin which are inserted into the first metatarsal in advance and are located in the proximal part of the first metatarsal and the distal truncated part of the first metatarsal in sequence, and the base frame can be locked on the positioning pin using the positioning pin lock to achieve stable fixation of the base frame on the first metatarsal; then, the advancement bolt which is screwed into the base frame in advance is rotated, and the advancement bolt can push the distal truncated part of the first metatarsal toward the second metatarsal, thereby correcting the angle between the axis line of the first metatarsal and the axis line of the proximal phalanx of the first metatarsal (i.e., the hallux valgus angle) and the angle between the axis line of the first metatarsal and the axis line of the second metatarsal (i.e., the angle between the first metatarsal and the second metatarsal).

[0019] That is to say, the reduction tool can lock its base frame on the positioning pin that has been inserted into the proximal part of the first metatarsal in advance with the help of the positioning pin lock, and achieve stable fixation of the base frame on the proximal part of the first metatarsal, so that the reduction tool can exert a unique and unchangeable push on the distal truncation part of the first metatarsal, and ensure that the reduction tool can reduce the hallux valgus angle and the angle between the first metatarsal and the second metatarsal more safely and reliably, thereby improving the treatment effect of minimally invasive surgery for hallux valgus.

[0020] In addition, since the advancement bolt can only achieve translation of the distal truncation of the first metatarsal, the correction ability of this method is limited. For this reason, the reduction tool adds the function of rotational reduction of the distal truncation of the first metatarsal to correct the hallux valgus angle and the angle between the distal articular surface of the first metatarsal and the axis of the first metatarsal (i.e., the distal articular surface angle of the first metatarsal), which is beneficial to further improve the treatment effect of minimally invasive surgery for hallux valgus. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0022] Figure 1 This is a diagram showing the use of a reduction tool for hallux valgus surgery according to an embodiment of the utility model;

[0023] Figure 2 A cross-sectional view of a reduction tool for hallux valgus surgery according to an embodiment of the utility model;

[0024] Figure 3 Shows Figure 2 a base frame of the reset tool shown;

[0025] Figure 4 Shows Figure 2 Push bolt of reset tool shown.

[0026] Explanation of the reference numerals: 100, reset tool; 1, base frame; 1a, internal threaded hole; 1b, operating space; 1c, arc slide; 1d, arc through hole; 1e, positioning pin hole; 1f, avoidance gap; 11, arc block portion; 12, support rod portion; 13, flat portion; 14, straight block portion; 2, sliding part; 2a, reset pin hole; 3, positioning pin; 4, reset pin; 5, positioning pin lock; 51, positioning pin embedding component; 52, positioning pin locking nut; 6, pushing bolt; 61, screw portion; 61a, threaded section; 61b, connecting section; 61c, pressing section; 62, operating portion; 7, reset pin lock; 71, reset pin embedding component; 72, reset pin locking nut; 8, locking mechanism; 81, female threaded hole; 82, locking bolt. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0028] Figure 1 This is a diagram showing the use of a reduction tool for hallux valgus surgery according to an embodiment of the utility model. Figure 2 2 is a cross-sectional view of a reduction tool for hallux valgus surgery according to an embodiment of the present invention. Figure 1 and Figure 2 As shown, the utility model provides a reduction tool 100 for hallux valgus surgery, and the reduction tool 100 includes a base frame 1. The base frame 1 has a proximal end close to the patient's foot and a distal end away from the patient's foot. Figure 2 and Figure 3 As shown, the base frame 1 includes an internal threaded hole 1a, an operating space 1b and an arc slideway 1c arranged in sequence from the proximal end to the distal end of the base frame 1, an arc through hole 1d penetrating the arc slideway 1c, and a positioning pinhole 1e arranged near the end of the arc slideway 1c. The operating space 1b is connected to both the arc through hole 1d and the internal threaded hole 1a.

[0029] The resetting tool 100 also includes a sliding member 2 which can be slidably mounted on the base frame 1 along the circular arc slideway 1c and has a resetting pin hole 2a, a positioning pin 3 which passes through the positioning pin hole 1e and has a radial dimension approximately the same as that of the positioning pin hole 1e, a resetting pin 4 which passes through the circular arc through hole 1d, the resetting pin hole 2a and the internal threaded hole 1a and has a radial dimension identical to that of the resetting pin hole 2a, a positioning pin lock buckle 5 which is arranged on the base frame 1 and sleeved outside the positioning pin 3 so as to releasably lock the base frame 1 on the positioning pin 3, and a pushing bolt 6 which sleeves outside the resetting pin 4 and can be inserted into the internal threaded hole 1a of the base frame 1 from the operating space 1b.

[0030] When the osteotomy is completed and reduction is required, the positioning pin 3 and the reduction pin 4 need to be driven into the first metatarsal in advance, so that the positioning pin 3 and the reduction pin 4 are located in the proximal part of the first metatarsal and the distal truncated part of the first metatarsal respectively and are located on both sides of the osteotomy seam of the first metatarsal at the same time. Next, the base frame 1 equipped with the push bolt 6 and the positioning pin lock buckle 5 is installed on the positioning pin 3 and the reduction pin 4, and ensure that the positioning pin 3 passes through the positioning pin lock buckle 5 and the positioning pin hole 1e, and the reduction pin 4 passes through the internal threaded hole 1a of the base frame 1, the center hole of the push bolt 6, the reduction pin hole 2a of the sliding member 2, and the arc through hole 1d and the arc slide 1c of the base frame 1. Next, the base frame 1 is locked on the positioning pin 3 using the positioning pin lock buckle 5 to achieve stable fixation of the base frame 1 on the diaphyseal part of the first metatarsal. Then, the push bolt 6 is rotated in the operating space 1b of the base frame 1, and the push bolt 6 is used to push the distal truncated portion of the first metatarsal toward the second metatarsal, so as to correct the angle between the axis of the first metatarsal and the axis of the second metatarsal and part of the hallux valgus angle. It can be seen that the reduction tool 100 can lock its base frame 1 on the positioning pin 3 inserted into the proximal part of the first metatarsal in advance by means of the positioning pin lock 5, so as to achieve stable fixation of the base frame 1 on the first metatarsal, so that the reduction tool 100 can apply a unique and unchangeable push to the distal truncated portion of the first metatarsal, and ensure that the reduction tool 100 can reduce the hallux valgus angle and the angle between the first metatarsal and the second metatarsal more safely and reliably, thereby improving the treatment effect of minimally invasive surgery for hallux valgus.

[0031] In this embodiment, the reduction tool 100 may also include a reduction needle lock buckle 7 provided on the sliding member 2 and sleeved on the reduction needle 4, and a locking mechanism 8 provided on the sliding member 2 and the base frame 1, wherein the reduction needle lock buckle 7 is used to releasably lock the reduction needle 4 on the sliding member 2, and the locking mechanism 8 releasably locks the sliding member 2 at any position in the circular arc slide 1c on the base frame 1. When the push bolt 6 pushes the distal truncated portion of the first metatarsal toward the second metatarsal, and the angle between the axis of the first metatarsal and the axis of the proximal phalanx of the first metatarsal (i.e., the hallux valgus angle) is not reduced to the target range (e.g., 0-15°), the reduction needle lock buckle 7 can be used to lock the reduction needle 4 on the sliding member 2, and then the push bolt 6 can be screwed out from the internal threaded hole 1a of the base frame 1, and then the sliding member 2 can be pushed to slide along the circular arc slide 1c in the base frame 1. The sliding member 2 is moved to force the bone part of the first metatarsal to rotate through the resetting pin 4 and reduce the hallux valgus angle again and correct the angle between the distal articular surface of the first metatarsal and the axis of the first metatarsal (i.e., the distal articular surface angle of the first metatarsal), until the hallux valgus angle, the angle between the first metatarsal and the second metatarsal, and the distal articular surface angle of the first metatarsal are all reduced to the target range, thereby completely completing the correction of the three angles and improving the treatment effect of minimally invasive surgery for hallux valgus. Compared with the related art, in addition to the translational resetting, this embodiment also adds a rotational resetting function, thereby completing multi-angle reduction and achieving complete hallux valgus correction.

[0032] In this embodiment, the positioning pin lock buckle 5 includes a positioning pin embedding component 51 and a positioning pin locking nut 52, wherein the positioning pin embedding component 51 is sleeved outside the positioning pin 3 and includes a fixed end fixed in the base frame 1 and a locking end with multiple claws, and the positioning pin locking nut 52 is sleeved outside the locking end of the positioning pin embedding component 51 and is threadedly connected thereto. The positioning pin locking nut 52 and the locking end of the positioning pin embedding component 51 are provided with a taper at the mating point, so that the positioning pin locking nut 52 can selectively retract the multiple claws when being rotated, and force the multiple claws to hold the positioning pin 3 tightly, and at this time, the positioning pin lock buckle 5 can releasably lock the base frame 1 on the positioning pin 3.

[0033] Similarly, the reset pin latch 7 includes a reset pin embedding member 71 and a reset pin locking nut 72. The reset pin embedding member 71 is sleeved outside the reset pin 4 and includes a fixed end fixed in the base frame 1 and a locking end having a plurality of claws. The reset pin locking nut 72 is sleeved outside the locking end of the reset pin embedding member 71 and is threadedly connected thereto. Wherein, a taper is provided at the mating portion of the reset pin locking nut 72 and the locking end of the reset pin embedding member 71, so that the reset pin locking nut 72 can selectively contract the plurality of claws when rotated, and force the plurality of claws to hold the reset pin 4 tightly. At this time, the reset pin latch 7 releasably locks the reset pin 4 on the sliding member 2. Exemplarily, the connection between the positioning pin embedding member 51 and the base frame 1 and the connection between the reset pin embedding member 71 and the base frame 1 can both be selected as threaded connections, or locking can be achieved by screws on the basis of plugging.

[0034] In this embodiment, the locking mechanism 8 includes a female threaded hole 811a provided on the sliding member 2, and a locking bolt 82 that can pass through the arc through hole 1d and be screwed into the female threaded hole 811a. That is to say, no matter where the sliding member 2 is located in the arc slideway 1c, as long as the locking bolt 82 is tightened into the female threaded hole 811a of the sliding member 2, it can releasably lock the sliding member 2 on the base frame 1. Among them, the locking bolt 82 can be selected as a conventional bolt, or a bolt composed of a screw rod and a nut and having a structure similar to that of a bolt, etc.

[0035] In this embodiment, as Figure 2 and Figure 3 shown, the base frame 1 includes an arc block portion 11 having an arc slideway 1c and an arc through hole 1d, a support rod portion 12 connected to one end of the arc block portion 11 and extending radially inward of the arc block portion 11, a flat portion 13 perpendicularly connected to the end of the support rod portion 12 away from the arc block portion 11 and having an internal threaded hole 1a, and a straight block portion 14 connected to the other end of the arc block portion 11 and having a positioning pin hole 1e. Among them, the arc block portion 11, the support rod portion 12, and the flat portion 13 are approximately in a C shape and jointly enclose an operation space 1b. It should be noted that the content described in this paragraph is only an example of the base frame 1, not the only implementation manner of the base frame 1. Any structure that can have an internal threaded hole 1a, an operation space 1b, an arc slideway 1c, an arc through hole 1d, and a positioning pin hole 1e and does not hinder the reset operation is within the scope protected by the present invention.

[0036] As an example, in order to facilitate the doctor to more accurately control the correction angle, scales can also be provided on the base frame 1 and / or the propulsion bolt 6 for the doctor to control the translation distance and rotation angle during reset, so as to achieve customized hallux valgus surgery.

[0037] Exemplarily, the scale on the base frame 1 can be set on the support rod 12 and set along the length direction of the support rod 12. The unit of the scale is a length measurement unit, which is used to guide the doctor to control the translation distance of the distal truncated portion of the first metatarsal. Further, another scale can be provided on the arc block 11 of the base frame 1. The unit of the scale is an angle measurement unit, which is used to guide the doctor to control the rotation angle of the distal truncated portion of the first metatarsal. The unit of the scale on the push bolt 6 is a length measurement unit, which is used to guide the doctor to control the translation distance of the distal truncated portion of the first metatarsal.

[0038] As an example, in order to smoothly operate the reset tool 100, the geometric center line of the arc slide 1c, the geometric center line of the arc through hole 1d, the center axis of the internal threaded hole 1a, and the center axis of the reset pinhole 2a are constructed to be coplanar. At the same time, in order to facilitate the installation of the sliding member 2 into the base frame 1, the arc slide 1c has two openings formed on both sides of the arc block portion 11, so that the sliding member 2 can be installed into the arc slide 1c from the openings.

[0039] As an example, Figure 3 and Figure 4 As shown, the base frame 1 may further include an avoidance notch 1f provided on the flat portion 13 and connected to the internal threaded hole 1a, and the advancing bolt 6 includes a screw portion 61 and an operating portion 62 connected to the screw portion 61. The screw portion 61 includes a threaded section 61a, a connecting section 61b and a pressing section 61c that gradually move away from the operating portion 62, wherein the diameter of the connecting section 61b is smaller than the diameter of the threaded section 61a and the diameter of the pressing section 61c, and the width of the avoidance notch 1f is larger than the diameter of the connecting section 61b and smaller than the diameter of the screw portion 61, so that when the connecting section 61b is in the avoidance notch 1f, the operating portion 62 and the threaded section 61a are in the avoidance space, and the pressing section 61c is outside the base frame 1. The cooperation between the connecting section 61b and the avoidance notch 1f can, on the one hand, ensure that the push bolt 6 can be inserted into the internal threaded hole 1a of the flat portion 13 from the operating space 1b even if the length of the push bolt 6 is greater than the side opening length of the operating space 1b, so that the push bolt 6 can effectively push the bone part of the first metatarsal over a longer distance. On the other hand, it can ensure that the screwed-out push bolt 6 is not easy to interfere with the base frame 1 and interfere with the pushing of the sliding part 2.

[0040] In terms of manufacturing materials, all parts of the reduction tool 100 except the positioning pin 3 and the reduction pin 4 can be made of stainless steel, aluminum alloy or composite materials. As an example, the base frame 1, as the part with the largest volume and mass, is preferably made of a light-weight, high-strength aluminum alloy material to reduce the overall mass of the reduction tool 100. At the same time, the sliding part 2 is preferably made of a light-weight, high-strength and wear-resistant polyetheretherketone / ceramic composite material.

[0041] Next, the method for using the reset tool 100 according to the embodiment of the utility model is introduced, and the method comprises the following steps:

[0042] Reference Figure 1 and Figure 2 After the osteotomy of the first metatarsal bone is completed, the positioning needle 3 and the reduction needle 4 are inserted into the first metatarsal bone, so that the reduction needle 4 and the positioning needle 3 are located in the distal cut-off portion of the first metatarsal bone and the proximal portion of the first metatarsal bone respectively and are located on both sides of the osteotomy seam of the first metatarsal bone at the same time;

[0043] Install the base frame 1 with the sliding member 2, the pushing bolt 6, the positioning pin lock buckle 5, the reset pin lock buckle 7 and the locking mechanism 8 on the positioning pin 3 and the reset pin 4, ensuring that the positioning pin 3 passes through the positioning pin lock buckle 5 and the positioning pin hole 1e, and the reset pin 4 passes through the internal threaded hole 1a of the base frame 1, the center hole of the pushing bolt 6, the reset pin hole 2a of the sliding member 2, and the arc through hole 1d and the arc slideway 1c of the base frame 1;

[0044] Use the positioning pin lock 5 to lock the base frame 1 onto the positioning pin 3;

[0045] The advancement bolt 6 is rotated in the positive direction and the distal truncated portion of the first metatarsal is pushed by the advancement bolt 6 to approach the second metatarsal, so as to partially reduce the angle between the axis of the first metatarsal and the axis of the proximal phalanx of the first metatarsal (i.e., the hallux valgus angle) and completely correct the angle between the axis of the first metatarsal and the axis of the second metatarsal (i.e., the angle between the first metatarsal and the second metatarsal);

[0046] Use the reset needle lock buckle 7 to lock the reset needle 4 on the sliding member 2;

[0047] The push bolt 6 is rotated in the reverse direction until the connecting section 61b of the push bolt 6 is in the avoidance notch 1f, so that the push bolt 6 gradually enters the operating space 1b and is separated from the internal threaded hole 1a of the base frame 1;

[0048] Push the sliding member 2 to slide along the arc slideway 1c in the base frame 1, forcing the sliding member 2 to drive the distal truncated portion of the first metatarsal to rotate through the resetting pin 4, thereby completely correcting the angle between the distal articular surface of the first metatarsal and the axis of the first metatarsal (i.e., the distal articular surface angle of the first metatarsal) and correcting the angle between the axis of the first metatarsal and the axis of the proximal phalanx of the first metatarsal (i.e., the hallux valgus angle);

[0049] The locking mechanism 8 is used to lock the sliding member 2 on the base frame 1 to complete the reduction operation of the hallux valgus surgery.

[0050] In the above description of the present application, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" and the like should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the connection between the inside of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in the present application, those skilled in the art can understand the specific meanings of the above terms in the present utility model according to the specific circumstances.

[0051] According to the above description of the present application, those skilled in the art may also understand that the terms used below, such as "inside", "outside" and other terms indicating orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings of the present application, and are only for the purpose of facilitating the explanation of the scheme of the present utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present utility model.

[0052] In addition, the terms "first" or "second" used in this application to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0053] Although multiple embodiments of the utility model have been shown and described herein, it is obvious to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art may think of many changes, modifications and alternatives without departing from the idea and spirit of the utility model. It should be understood that in the process of practicing the utility model, various alternatives to the embodiments of the utility model described herein may be adopted. The attached claims are intended to define the scope of protection of the utility model, and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A reduction tool for hallux valgus surgery, characterized in that: include: A base frame, comprising an internal threaded hole, an operating space, an arc slide, and an arc through hole penetrating the arc slide and a positioning pin hole arranged near the end of the arc slide, wherein the operating space is connected to both the arc through hole and the internal threaded hole; A sliding member, which is mounted on the base frame and can slide along the arc slideway, and the sliding member includes a reset pinhole; A positioning needle, which passes through the positioning needle hole and has the same radial dimension as the positioning needle hole; A reset needle, which passes through the circular arc through hole, the reset needle hole and the internal threaded hole, and has the same radial dimension as the reset needle hole; A positioning pin lock buckle, which is arranged on the base frame and sleeved outside the positioning pin, and is used to releasably lock the base frame on the positioning pin; as well as A push bolt is sleeved outside the reset needle and can be inserted into the internal threaded hole of the base frame from the operating space.

2. The resetting tool according to claim 1, characterized in that: Also includes: A reset needle lock buckle, which is arranged on the sliding member and sleeved outside the reset needle, and is used to releasably lock the reset needle on the sliding member; as well as The locking mechanism is arranged on the sliding member and the base frame and is used to releasably lock the sliding member at any position in the circular arc slideway on the base frame.

3. The resetting tool according to claim 2, characterized in that: The positioning pin lock comprises: A positioning pin embedding component, which is sleeved outside the positioning pin and includes a fixed end fixed in the base frame and a locking end with a plurality of claws; and A positioning pin locking nut, which is sleeved outside the locking end of the positioning pin embedding component and is threadedly connected thereto; Wherein, the fitting part between the positioning pin locking nut and the locking end of the positioning pin embedding component is provided with a taper, so that the positioning pin locking nut can selectively retract a plurality of claws when being rotated, and force the plurality of claws to hold the positioning pin tightly; The reset needle lock comprises: a reset needle embedding component, which is sleeved outside the reset needle and includes a fixed end fixed in the base frame and a locking end with a plurality of claws; and A reset needle locking nut, which is sleeved outside the locking end of the reset needle embedding component and is threadedly connected thereto; The fitting part between the reset needle locking nut and the locking end of the reset needle embedding component is provided with a taper, so that the reset needle locking nut can selectively retract multiple claws when being rotated, and force the multiple claws to hold the positioning needle or reset needle.

4. The resetting tool according to claim 2, characterized in that: The locking mechanism comprises a female threaded hole arranged on the sliding member, and a locking bolt which can pass through the circular arc through hole and be screwed into the female threaded hole.

5. The reduction tool according to any one of claims 1 to 4, characterized in that: The base frame comprises: An arc block portion, which has the arc slideway and the arc through hole; A support rod portion connected to one end of the arc block portion and extending radially inward of the arc block portion; a flat portion, which is vertically connected to the end of the support rod portion away from the arc block portion and has the internal threaded hole; and A straight block portion, connected to the other end of the arc block portion and having the positioning pinhole; The arc block portion, the support rod portion and the flat portion together enclose the operating space.

6. The resetting tool according to claim 5, characterized in that: The geometric center line of the arc slideway, the geometric center line of the arc through hole, the center axis of the internal threaded hole and the center axis of the reset pinhole are coplanar.

7. The resetting tool according to claim 5, characterized in that: The base frame also includes an avoidance notch arranged on the flat portion and connected to the internal threaded hole, the push bolt includes a screw portion and an operating portion connected to the screw portion, the screw portion includes a threaded section, a connecting section and a pressing section that gradually move away from the operating portion, wherein the diameter of the connecting section is smaller than the diameter of the threaded section and the diameter of the pressing section, the width of the avoidance notch is larger than the diameter of the connecting section and smaller than the diameter of the screw portion, so that when the connecting section is in the avoidance notch, the operating portion and the threaded section are in the avoidance space, and the pressing section is outside the base frame.

8. The resetting tool according to claim 7, characterized in that: The base frame is made of aluminum alloy material.

9. The resetting tool according to claim 7, characterized in that: The circular arc slideway has two openings respectively formed on both sides of the arc block portion, so that the sliding member can be installed into the circular arc slideway through the openings.

10. The reduction tool according to any one of claims 1 to 4, characterized in that: The sliding member is made of a polyetheretherketone / ceramic composite material.

11. The reduction tool according to claim 1, characterized in that: The base frame and / or the push bolt are provided with scales.

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