A three-point phalange extender

Abstract

The application discloses a three-fixed-point phalanx extender, which comprises a first fixing needle, a second fixing needle and a moving needle, a base, a first part of a first surface of the base being recessed inward to form a sliding groove, the first fixing needle being connected to a second part of the first surface of the base, a threaded rod, an end of the threaded rod being penetrated into the base from a first end of the base and penetrating through the sliding groove along the length direction of the sliding groove, a sliding assembly being connected with the threaded rod, one end of the moving needle being connected to the sliding assembly, the threaded rod being rotated to drive the sliding assembly to drive the moving needle to slide along the threaded rod in the sliding groove, and a rotating assembly being connected to a second end of the base, the rotating assembly being capable of rotating relative to the second end of the base, and one end of the second fixing needle being connected with the rotating assembly. The three-fixed-point phalanx extender is fixed by three fixing needles in a three-point fixed mode, so that the surgical process is more stable.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, specifically relating to a three-point finger bone lengthening device. Background Technology

[0002] Because shorter distal phalanges are difficult to regenerate, distal phalange lengthening surgery is necessary for patients with short distal phalanges or traumatic hooked nails. This surgery generally involves two steps: osteotomy followed by traction osteogenesis, using a bone lengthener to laterally lengthen the bone segment. This achieves decompression, reconstruction of distal microcirculation, and treatment of conditions such as diabetic foot, vasculitis, and distal microvascular occlusion. Since osteotomy often requires large skin incisions or extensive tissue dissection, surgical failure can lead to significant damage, excessive bleeding, and noticeable postoperative scarring, affecting aesthetics and even finger movement. A major reason for surgical failure is the instability of existing bone lengtheners during traction osteogenesis, making it difficult to maintain the correct traction angle and easily leading to malunion. When lateral movement of the bone segment is required, the positions of the fixation pins on each segment need to be adjusted sequentially, resulting in uneven movement of the bone segments. Summary of the Invention

[0003] This invention solves the technical problem of instability in finger bone lengtheners.

[0004] To achieve the above objectives, the present invention provides a three-point fixed-point phalanx lengthener, comprising a first fixing pin, a second fixing pin, and a transfer pin;

[0005] The base has a first portion of its first surface recessed inward to form a groove; the first fixing pin is connected to a second portion of the first surface of the base.

[0006] A threaded rod, the end of which enters the base from the first end of the base and passes through the groove along the length of the groove;

[0007] A sliding assembly is connected to the threaded rod; one end of the transfer pin is connected to the sliding assembly, and rotating the threaded rod causes the sliding assembly to drive the transfer pin to slide along the threaded rod within the groove;

[0008] A rotating assembly is connected to the second end of the base, the rotating assembly being able to rotate relative to the second end of the base, and one end of the second fixing pin is connected to the rotating assembly.

[0009] Optionally, it also includes at least two limit pins;

[0010] The threaded rod includes a head and a rod portion, and a limiting groove is provided around the head of the threaded rod;

[0011] The limiting pin is inserted into the base, and its end abuts against the limiting groove of the threaded rod.

[0012] Optionally, the first part of the head is located inside the base, the limiting groove is provided in the first part of the head, and the second part of the head is located outside the base;

[0013] The rod is located within the base.

[0014] Optionally, the sliding assembly includes a slider, a third pressure cap, and a third fastening screw;

[0015] The slider is connected to the threaded rod;

[0016] The slider and the third pressure cap are connected by the third fastening screw, and the transfer pin is located between the slider and the third pressure cap.

[0017] Optionally, the end of the third fastening screw does not contact the threaded rod.

[0018] Optionally, the rotating assembly includes a gasket, a second pressure cap, and a second fastening screw;

[0019] The gasket and the second pressure cap are connected by the second fastening screw, and the second fixing pin is connected between the gasket and the second pressure cap.

[0020] Optionally, the end of the second fastening screw penetrates into the base, and the gasket and the second pressure cap are fixedly connected to the second fastening screw;

[0021] Rotating the second fastening screw causes the gasket and the second pressure cap to rotate relative to the second end of the base.

[0022] Optionally, the rotation range of the second fastening screw is 0-30°.

[0023] Optionally, it also includes a first gland and a first fastening screw;

[0024] The second portion of the first surface of the base protrudes in a direction away from the base, forming a protrusion;

[0025] The first gland is connected to the protrusion by the first fastening screw, and the first fixing pin is connected between the protrusion and the first gland.

[0026] Optionally, when the first fixing pin, the second fixing pin, and the transfer pin are parallel to the bottom surface of the base, the distances between the first fixing pin, the second fixing pin, and the transfer pin and the bottom surface of the base are the same.

[0027] The beneficial effects of this invention are as follows:

[0028] (1) The present invention provides a three-point fixed finger bone lengthener, which uses three fixing pins to fix the finger bone at three points, making the surgical process more stable.

[0029] (2) The first fixing pin of the present invention is inserted into the finger bone in parallel, and the second fixing pin can be inserted into the finger bone at a certain angle after being tilted. The rotating component can rotate with the angle of the second fixing pin to better adapt to the second fixing pin. The first fixing pin and the second fixing pin form a three-dimensional structure, which is more stable than a structure in which the two fixing pins are parallel to each other.

[0030] (3) The transfer needle of the present invention can move along the groove, and bone lengthening can be achieved without changing the position of the fixation needle, saving surgical time and surgical operation steps. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the three-point finger bone lengthening device of the present invention.

[0032] Figure 2 This is a cross-sectional view of the three-point finger bone lengthening device of the present invention.

[0033] Figure 3 This is a schematic diagram of the threaded rod 5 of the three-point finger bone extension device of the present invention.

[0034] Figure 4 This is a schematic diagram showing the usage state of the three-point finger bone lengthening device of the present invention.

[0035] Figure 5 This is a schematic diagram showing that the rotating component of the present invention forms a certain angle with the base.

[0036] In the figure, 10-first fixing pin, 11-first pressure cap, 12-first fastening screw, 2-rotating assembly, 20-second fixing pin, 21-shield, 22-second pressure cap, 23-second fastening screw, 3-sliding assembly, 30-moving pin, 31-slider, 32-third pressure cap, 33-third fastening screw, 4-base, 41-first surface, 42-slide groove, 43-protrusion, 44-limiting pin, 5-threaded rod, 51-head, 510-limiting groove, 52-rod portion. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Currently, most finger bone lengtheners are either two-point lengtheners with two fixing pins, or four-point lengtheners with two screws per group, containing two groups of four screws in total. These lengtheners have poor stability and are difficult to maintain during surgery.

[0041] Therefore, the present invention provides a three-point finger bone lengthener that can simultaneously fix three pins, which form three fixed points on the finger bone, resulting in higher stability.

[0042] like Figure 1 and Figure 2 As shown, the three-point finger bone extender of the present invention includes a base 4, a portion of the first surface of the base 4 being recessed into the base to form a groove 42. The end of a threaded rod 5 extends into the base from the first end of the base 4, and the threaded rod 5 extends through the groove 42 at least along its length.

[0043] The sliding assembly 3 is connected to the threaded rod 5. Rotating the threaded rod 5 allows the sliding assembly 3 to slide along the threaded rod 5 within the groove 42. One end of the transfer pin 3 can be connected to the sliding assembly 3. The sliding assembly 3 includes a slider 31, a third pressure cap 32, and a third fastening screw 33. The slider 31 is connected to the threaded rod 5, and the third fastening screw 33 connects the slider 31 and the third pressure cap 32. The transfer pin 3 is located between the slider 31 and the third pressure cap 32. The threaded rod 5 includes a head 51 and a rod portion 52 (e.g., ...). Figure 3 As shown), the rod 52 is threaded, the slider 31 is threadedly connected to the rod 52 of the threaded rod 5, and the end of the third fastening screw 33 does not contact the threaded rod.

[0044] A portion of the first surface of the base 4 protrudes away from the base 4 to form a protrusion 42. The first pressure cap 11 is connected to the protrusion 42 by the first fastening screw 12. The first fixing pin 10 can be connected between the protrusion 42 and the first pressure cap 11.

[0045] The rotating assembly 2 is connected to the second end of the base 4 and is rotatable relative to the second end of the base 4. One end of the second fixing pin 20 is connected to the rotating assembly 2. The rotating assembly 2 includes a gasket 21, a second pressure cap 22, and a second fastening screw 23. The gasket 21 and the second pressure cap 22 are connected by the second fastening screw 23, and the second fixing pin 20 can be connected between the gasket 21 and the second pressure cap 22. The end of the second fastening screw 23 penetrates into the base 4. The gasket 21 and the second pressure cap 22 are fixedly connected to the second fastening screw 23, while the end of the second fastening screw 23 is rotatably connected to the base 4. Rotating the second fastening screw 23 causes the gasket 21 and the second pressure cap 22 to rotate relative to the second end of the base 4. The rotation range of the second fastening screw 23 is 0-30°.

[0046] like Figure 3 As shown, the threaded rod includes a head 51 and a rod portion 52. The head 51 comprises a first part and a second part, the first part being located inside the base 4 and the second part being located outside the base 4; the rod portion 52 is located inside the base 4. A limiting groove 510 is provided around the head 51 of the threaded rod, and the limiting groove is located in the first part of the head 51. A limiting pin 44 penetrates into the base 4 perpendicularly to the surface of the base 4, and its end abuts against the limiting groove 510 of the threaded rod 5. Therefore, when the second part of the head 51 is rotated, under the restriction of the limiting pin 44, the threaded rod 5 will only rotate axially and will not displace and detach from the base 4.

[0047] The three fixing pins of the three-point phalanx lengthener of the present invention are a second fixing pin 20, a first fixing pin 10, and a transfer pin 30, arranged from proximal to distal. When the first fixing pin 10, the second fixing pin 20, and the transfer pin 30 are parallel to the bottom surface of the base 4, the distances between the first fixing pin 10, the second fixing pin 20, and the transfer pin 30 and the bottom surface of the base 4 are the same. In use, the second fixing pin 20 and the first fixing pin 10 can form an angle, which creates a three-dimensional structure between the two fixing pins. Compared with fixing pins that are parallel to each other and only form a single plane, the two fixing pins with an angle further increase the stability of the phalanx lengthener and the reliability of the surgery. The angle of the pins is also more adaptable to the shape of different patients' phalanges and actual stress conditions. The angle of the rotating component 2 is adjustable, so that the second fixing pin 20, which is tilted at a certain angle, can also be locked onto the base. The first fixing pin 10 and the moving pin 30 are roughly parallel. The moving pin 30 can move horizontally with the rotation of the threaded rod, so that bone lengthening can be achieved without changing its position, saving surgical time and surgical procedures.

[0048] like Figure 4 As shown, the method of using the present invention includes:

[0049] Step 1: Disinfect the finger bone lengthener and preliminarily determine the injection sites for the finger bones that the patient needs to lengthen;

[0050] Step 2: First, insert the first fixation pin 10 into the distal phalanx near the articular surface, then insert the second fixation pin 20 into the distal end of the middle phalanx. The second fixation pin 20 can form a certain angle with the first fixation pin 10. Finally, insert the transfer pin 30 into the distal end of the distal phalanx.

[0051] Step 3: Adjust the angle of the rotating component 2 so that the angle formed by the rotating component 2 and the base 4 is consistent with the angle formed by the first fixing pin 10 and the second fixing pin 20, such as... Figure 5 As shown, one end of the first fixing pin 10, the second fixing pin 20, and the transfer pin 30 are respectively connected to the base;

[0052] Step 4: Use an osteotomy device to cut the distal phalanx between the first fixation pin 10 and the transfer pin 30;

[0053] Step 5: Adjust the threaded rod 5 to move the transfer needle 30 to lengthen the bone.

[0054] In summary, this invention provides a three-point fixation finger bone lengthener that can simultaneously fix three pins, forming three fixed points on the finger bone for enhanced stability. The first and second pins are driven into the finger bone at a specific angle, creating a three-dimensional structure that further strengthens stability. A rotating component that can rotate relative to the base ensures the second pin is locked to the base. A transfer pin can slide on the base, allowing finger bone lengthening without the need for the pins to be removed and re-driven.

[0055] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A triad of knuckle lengthener characterized by, The first fixed needle, the second fixed needle and the moving needle; The first part of the first surface of the base is recessed inwardly to form a sliding groove; the first fixed needle is connected to the second part of the first surface of the base; The threaded rod is inserted into the base through the first end of the base, and extends along the length direction of the sliding groove; The sliding assembly is connected to the threaded rod; one end of the moving needle is connected to the sliding assembly; the sliding assembly drives the moving needle to slide along the threaded rod in the sliding groove by rotating the threaded rod; The rotating assembly is connected to the second end of the base; the second end of the base can rotate relative to the rotating assembly; one end of the second fixed needle is connected to the rotating assembly; The rotating assembly includes a gasket, a second gland and a second fastening screw; The gasket and the second gland are connected by the second fastening screw; the second fixed needle is connected between the gasket and the second gland; the end of the second fastening screw is inserted into the base; the gasket and the second gland are fixedly connected with the second fastening screw; the gasket and the second gland are driven to rotate relative to the second end of the base by rotating the second fastening screw; the rotation range of the second fastening screw is between 0-30°.

2. The triad finger extender of claim 1, wherein, At least two limiting pins are further included; The threaded rod includes a head and a rod; a limiting groove is arranged around the head of the threaded rod; The limiting pins are inserted into the base, and the ends of the limiting pins abut against the limiting groove of the threaded rod.

3. The three-point phalange extender of claim 2, wherein The first part of the head is located in the base, the limiting groove is arranged on the first part of the head, and the second part of the head is located outside the base; The rod is located in the base.

4. The three-point phalange extender of claim 1, wherein The sliding assembly includes a sliding block, a third gland and a third fastening screw; The sliding block is connected to the threaded rod; The sliding block and the third gland are connected by the third fastening screw; the moving needle is arranged between the sliding block and the third gland.

5. The three-point phalange extender of claim 4, wherein The end of the third fastening screw does not contact the threaded rod.

6. The tri-pin finger extender of claim 1, wherein, A first gland and a first fastening screw are further included; The second part of the first surface of the base is protruded away from the base to form a protruding part; The first gland is connected to the protruding part by the first fastening screw; the first fixed needle is connected between the protruding part and the first gland.

7. The tri-pin finger extender of claim 1, wherein, When the first fixed needle, the second fixed needle and the moving needle are parallel to the bottom surface of the base, the distance between the first fixed needle, the second fixed needle and the moving needle and the bottom surface of the base is the same.

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