Adjustable knee replacement spacer prototype

Abstract

The present application relates to the technical field of medical auxiliary equipment, and in particular to an adjustable knee replacement gasket specimen, comprising: a specimen base, which is hollow inside to form a storage space; a specimen upper shell buckled on the specimen base; a first lifting mechanism, which is arranged in the storage space and abuts against the specimen upper shell; a second lifting mechanism, which is arranged in the storage space and abuts against the specimen upper shell; a transmission mechanism, which is transmission-connected to the first lifting mechanism and the second lifting mechanism, and is used to drive the first lifting mechanism and the second lifting mechanism to move relative to the specimen base to adjust the distance between the specimen upper shell and the specimen base. The adjustable knee replacement gasket specimen provided by the present application has a thickness adjustment by a knob, and the best gasket model required for knee replacement can be obtained by one installation, avoiding repeated replacement of gasket specimens during surgery, simplifying the surgical steps, and shortening the surgical time; there is no need to sterilize various types of gasket specimens for standby use, which reduces the cost of sterilization and supply.

Description

Technical Field

[0001] The present application relates to the technical field of medical auxiliary equipment, and in particular to an adjustable knee replacement gasket specimen. Background Art

[0002] Total knee replacement is an effective measure for the treatment of severe osteoarthritis and other diseases. In total knee replacement, choosing a high-cross-linked polyethylene gasket of a suitable model (i.e. thickness) is of great significance for the balance of knee flexion and extension gap, appropriate joint line height, and good joint mobility. It is an important influencing factor for the postoperative knee flexion and extension function, pain, and patient satisfaction. However, at present, the gasket model test is often carried out by repeatedly replacing gasket specimens of different models, which is time-consuming and labor-intensive, and various gasket specimens need to be sterilized for standby use, and the sterilization and supply costs are high. Summary of the invention

[0003] The purpose of the present application is to provide an adjustable knee replacement gasket specimen, so as to solve to a certain extent the technical problem existing in the prior art that the gasket model needs to be tested by repeatedly replacing gasket specimens of different models.

[0004] The present application provides an adjustable knee replacement spacer specimen, comprising:

[0005] The specimen base is hollow inside to form a containing space;

[0006] The specimen upper shell is buckled on the specimen base;

[0007] A first lifting mechanism is disposed in the containing space and abuts against the upper shell of the specimen;

[0008] A second lifting mechanism is disposed in the accommodation space and abuts against the upper shell of the specimen;

[0009] A transmission mechanism is transmission-connected to the first lifting mechanism and the second lifting mechanism, and is used to drive the first lifting mechanism and the second lifting mechanism to move relative to the specimen base to adjust the distance between the specimen upper shell and the specimen base, and the specimen upper shell and the specimen base can be locked with each other after being adjusted to a specified position.

[0010] In the above technical solution, further, the specimen base has a groove structure with an opening facing upward, and the interior of the groove structure forms the accommodating space; and the specimen upper shell is buckled on the opening of the specimen base.

[0011] In any of the above technical solutions, further, a first fixing portion and a second fixing portion are arranged in the accommodating space at intervals, and both the first fixing portion and the second fixing portion have a tube structure or a groove structure;

[0012] The first fixing portion and the second fixing portion are symmetrically arranged about a central axis of the specimen base extending in the width direction.

[0013] In any of the above technical solutions, further, the first lifting mechanism includes:

[0014] A first lifting sleeve is disposed in the first fixing portion, and one end of the first lifting sleeve is connected to a side surface of the specimen upper shell facing the accommodation space;

[0015] The first lifting screw is at least partially disposed inside the first lifting sleeve and is threadedly connected to the first lifting sleeve.

[0016] In any of the above technical solutions, further, the second lifting mechanism includes:

[0017] A second lifting sleeve is disposed in the second fixing portion, and one end of the second lifting sleeve is connected to a side surface of the specimen upper shell facing the accommodation space;

[0018] The second lifting screw is at least partially disposed inside the second lifting sleeve and is threadedly connected to the inner wall surface of the second lifting sleeve.

[0019] In any of the above technical solutions, further, part of the side wall of the trough structure is bent toward the inside of the trough structure to form a notch portion, the notch portion is provided with a mounting base plate, and the mounting base plate is vertically provided with a connecting shaft;

[0020] A first through hole and a second through hole are formed on a side wall of the notch.

[0021] In any of the above technical solutions, further, the transmission mechanism includes:

[0022] A roller is arranged on the connecting shaft, and the roller can rotate with the connecting shaft as the pivot center; gear teeth are formed on the side wall surface of the roller and the position connected to the side wall surface; the roller is provided with a counting member;

[0023] The first transmission assembly comprises: a first worm and a first transmission member; the first transmission member comprises a first shaft portion and a first tooth portion arranged along the circumference of the first shaft portion; one end of the first worm is meshed with the gear teeth of the roller, the other end of the first worm passes through the first through hole and is meshed with the first tooth portion, the first shaft portion is connected to the first lifting screw; the first transmission member is connected to a first pressure detection component;

[0024] The second transmission assembly includes: a second worm and a second transmission member; the second transmission member includes a second shaft portion and a second tooth portion arranged along the circumference of the second shaft portion; one end of the second worm is meshed with the gear teeth of the roller, and the other end of the second worm passes through the second through hole and is meshed with the second tooth portion, and the second shaft portion is connected to the second lifting screw; the second transmission member is connected to a second pressure detection component.

[0025] In any of the above technical solutions, further, a marking scale is provided on the side wall of the roller to indicate the angle through which the roller has rotated.

[0026] In any of the above technical solutions, further, the angle between the straight line where the first worm is located and the straight line where the second worm is located is 120 degrees.

[0027] In any of the above technical solutions, further, the first lifting screw and the second lifting screw are both self-locking screws.

[0028] Compared with the prior art, the beneficial effects of this application are:

[0029] The adjustable knee replacement gasket specimen provided by the present application includes: a specimen base, a specimen upper shell, a first lifting mechanism, a second lifting mechanism and a transmission mechanism, wherein the specimen upper shell is buckled on the specimen base, the interior of the specimen base is hollow to form a accommodating space, the first lifting mechanism and the second lifting mechanism are arranged in the accommodating space at intervals, the transmission mechanism is arranged on the specimen base and is simultaneously transmission-connected to the first transmission mechanism and the second transmission mechanism, the first lifting mechanism and the second lifting mechanism have the same structure, taking the first lifting mechanism as an example, one end of the first lifting mechanism is specifically the bottom end of the first lifting mechanism connected to the specimen base, and the other end of the first lifting mechanism is specifically the top end of the first lifting mechanism connected to a side wall of the specimen upper shell facing the accommodating space, by adjusting the transmission component, the top end of the first lifting mechanism can be made to rise or fall relative to the bottom end, so as to adjust the overall height of the first lifting mechanism, thereby adjusting the distance between the specimen upper shell and the specimen base, that is, adjusting the overall thickness (also known as the height) of the adjustable knee replacement gasket specimen.

[0030] The adjustable knee replacement gasket specimen provided in the embodiment of the present application has at least the following advantages compared to existing specimens / trial molds: the thickness can be adjusted by a knob, and the optimal gasket model required for knee replacement surgery can be obtained after one installation, thus avoiding repeated replacement of gasket specimens during surgery, simplifying the surgical steps, and shortening the operation time; there is no need to sterilize various types of gasket specimens for backup, thus reducing the cost of sterilization and supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A schematic diagram of the structure of an adjustable knee replacement spacer specimen provided in an embodiment of the present application;

[0033] Figure 2 A schematic structural diagram of a test piece base of an adjustable knee replacement spacer test piece provided in an embodiment of the present application;

[0034] Figure 3 A top view of an adjustable knee replacement spacer specimen provided in an embodiment of the present application;

[0035] Figure 4 Another schematic diagram of the structure of the adjustable knee replacement spacer specimen provided in an embodiment of the present application.

[0036] Reference numerals:

[0037] 1- specimen upper shell, 2- specimen base, 3- roller, 4- first worm, 5- first lifting sleeve, 6- first lifting screw, 7- first transmission member, 8- first fixing part, 9- second worm, 10- second lifting sleeve, 11- second fixing part. DETAILED DESCRIPTION

[0038] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0039] The components of the embodiments of the present application generally described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0040] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0041] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; 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 internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] Refer to the following Figures 1 to 4 An adjustable knee replacement spacer prototype according to some embodiments of the present application is described.

[0044] See also Figures 1 to 4 As shown, an embodiment of the present application provides an adjustable knee replacement gasket specimen, comprising a specimen base 2, a specimen upper shell 1, a first lifting mechanism, a second lifting mechanism and a transmission mechanism, wherein the specimen upper shell 1 is buckled on the specimen base 2, the interior of the specimen base 2 is hollow to form a receiving space, the first lifting mechanism and the second lifting mechanism are arranged in the receiving space at intervals, the transmission mechanism is arranged on the specimen base 2 and is simultaneously transmission-connected with the first transmission mechanism and the second transmission mechanism, the first lifting mechanism and the second lifting mechanism have the same structure, taking the first lifting mechanism as an example, one end of the first lifting mechanism, specifically the bottom end of the first lifting mechanism, is connected to the specimen base 2, and the other end of the first lifting mechanism, specifically the top end of the first lifting mechanism, is connected to a side wall of the specimen upper shell 1 facing the receiving space, by adjusting the transmission component, the top end of the first lifting mechanism can be made to rise or fall relative to the bottom end, so as to adjust the overall height of the first lifting mechanism, thereby adjusting the distance between the specimen upper shell 1 and the specimen base 2, that is, adjusting the overall thickness (also known as the height) of the adjustable knee replacement gasket specimen.

[0045] In one embodiment of the present application, preferably, the specimen base 2 has a slot structure with an opening facing upward, and a receiving space is formed inside the slot structure; the specimen upper shell 1 is buckled on the opening of the specimen base 2 .

[0046] In this embodiment, the specimen base 2 has a trough structure with an opening facing upwards, the specimen upper shell 1 is buckled on the opening of the trough structure and covers the opening of the trough structure, and the internal space of the trough structure forms a receiving space.

[0047] In one embodiment of the present application, preferably, a first fixing portion 8 and a second fixing portion 11 are arranged in the accommodating space at intervals, and both the first fixing portion 8 and the second fixing portion 11 have a tube structure or a groove structure;

[0048] The first fixing portion 8 and the second fixing portion 11 are symmetrically arranged with respect to a central axis extending in the width direction of the specimen base 2 .

[0049] In this embodiment, the central axis (line) extending in the width direction of the marking specimen base 2 is Figure 2 In the middle dotted line 1, the first fixing portion 8 and the second fixing portion 11 are symmetrically arranged in the accommodating space about the dotted line 1, the first fixing portion 8 and the second fixing portion 11 have the same structure, both are trough-shaped or cylindrical, and the inner wall surfaces of the first fixing portion 8 and the second fixing portion 11 are smooth, and the first fixing portion 8 and the second fixing portion 11 are respectively used to place the first lifting mechanism and the second lifting mechanism.

[0050] In one embodiment of the present application, preferably, the first lifting mechanism includes:

[0051] The first lifting sleeve 5 is disposed in the first fixing portion 8, and one end of the first lifting sleeve 5 is connected to a side surface of the specimen upper shell 1 facing the accommodation space;

[0052] The first lifting screw 6 is at least partially disposed inside the first lifting sleeve 5 and is threadedly connected to the first lifting sleeve 5 .

[0053] In this embodiment, the first lifting sleeve 5 is disposed in the first fixing portion 8, the outer wall surface of the first lifting sleeve 5 is smooth, or a gap is formed between the outer wall surface of the first lifting sleeve 5 and the inner wall surface of the first fixing portion 8, and there is no friction force between the two or the friction force is negligible;

[0054] The first lifting sleeve 5 has a cylindrical structure, and the inner wall surface of the first lifting sleeve 5 is formed with an internal thread, and the surface of the first lifting screw 6 is formed with an external thread that matches the internal thread of the inner wall surface of the first lifting sleeve 5, so as to realize the threaded connection between the first lifting screw 6 and the first lifting sleeve 5. When the first lifting screw 6 rotates in situ with its own axis as the center, the first lifting sleeve 5 can be raised or lowered relative to the first lifting screw 6;

[0055] Furthermore, the top end of the first lifting sleeve 5 is fixedly connected to the inner wall surface of the specimen upper shell 1 , and when the first lifting sleeve 5 is lifted or lowered relative to the first lifting screw 6 , the specimen upper shell 1 can move synchronously with the first lifting sleeve 5 .

[0056] In one embodiment of the present application, preferably, the second lifting mechanism includes:

[0057] The second lifting sleeve 10 is disposed in the second fixing portion 11, and one end of the second lifting sleeve 10 is connected to a side surface of the specimen upper shell 1 facing the accommodation space;

[0058] The second lifting screw is at least partially disposed inside the second lifting sleeve 10 and is threadedly connected to the inner wall surface of the second lifting sleeve 10 .

[0059] In this embodiment, the structure, connection and setting of the various parts of the second lifting mechanism are the same as those of the first lifting mechanism, which can be fully understood by those skilled in the art and there is no need to elaborate on them. However, it should be noted that the second lifting mechanism moves synchronously with the first lifting mechanism to ensure that the lifting heights of the two are the same, thereby ensuring that the overall thickness of the adjustable knee replacement gasket specimen changes evenly and the adjustment accuracy is significantly improved.

[0060] In one embodiment of the present application, preferably, part of the side wall of the trough structure is bent toward the inside of the trough structure to form a notch portion, the notch portion is provided with a mounting bottom plate, and the mounting bottom plate is vertically provided with a connecting shaft;

[0061] A first through hole and a second through hole are formed on the side wall of the notch.

[0062] In this embodiment, Figure 1 and Figure 2 In the state shown in , the slot structure of the specimen base 2 is recessed toward the operator to form a notch portion, a first through hole and a second through hole are formed on the side wall of the notch portion, and the bottom of the notch portion is a mounting base plate, a connecting shaft is vertically arranged on the mounting base plate, and the connecting shaft extends vertically upward, and the connecting shaft is used to mount the roller 3 described below.

[0063] In one embodiment of the present application, preferably, the transmission mechanism includes:

[0064] The roller 3 is arranged on the connecting shaft, and the roller 3 can rotate with the connecting shaft as the pivot center; the side wall surface of the roller 3 and the position connected to the side wall surface are formed with gear teeth; the roller 3 is provided with a counting member;

[0065] The first transmission assembly includes: a first worm 4 and a first transmission member 7; the first transmission member 7 includes a first shaft portion and a first tooth portion arranged along the circumference of the first shaft portion; one end of the first worm 4 is meshed with the gear teeth of the roller 3, the other end of the first worm 4 passes through the first through hole and meshes with the first tooth portion, and the first shaft portion is connected to the first lifting screw 6; the first transmission member 7 is connected to a first pressure detection component (not shown in the figure);

[0066] The second transmission assembly includes: a second worm 9 and a second transmission member; the second transmission member includes a second shaft portion and a second tooth portion arranged along the circumference of the second shaft portion; one end of the second worm 9 is meshed with the gear teeth of the roller 3, the other end of the second worm 9 passes through the second through hole and meshes with the second tooth portion, and the second shaft portion is connected to the second lifting screw;

[0067] The second transmission member is connected to a second pressure detecting component (not shown in the figure).

[0068] In this embodiment, the roller 3 is arranged on the connecting shaft. Specifically, the connecting shaft can be regarded as the central axis of the roller 3. The roller 3 rotates with the connecting shaft as the rotation center. The side wall surface and the bottom wall surface of the roller 3 are in a natural transition shape, and at least the part of the natural transition between the side wall surface and the bottom wall surface of the roller 3 is formed with gear teeth.

[0069] The first transmission assembly and the second transmission assembly have the same structure, and the first transmission assembly and the second transmission assembly are related to each other. Figure 2 The middle dotted line 1 is symmetrically arranged, and the first transmission assembly is taken as an example for explanation. The first transmission assembly includes a first worm 4 and a first transmission member 7. At least the portion close to the two ends of the first worm 4 is formed with spiral teeth, one end of the first worm 4 is meshed with the gear teeth of the roller 3, the rod portion of the first worm 4 is penetrated by the first through hole, and the end of the first worm 4 away from the roller 3 is used for transmission connection with the first transmission member 7;

[0070] Specifically, the first transmission member 7 includes a first tooth portion and a first shaft portion arranged on the first tooth portion, an end of the first worm 4 away from the roller 3 is meshed with the first tooth portion, and the extension direction of the first shaft portion is numerically upward. When the roller 3 is turned, the roller 3 drives the first worm 4 to rotate, and the first worm 4 drives the first tooth portion to transmit, so that the first shaft portion rotates with its own axis as the pivot center;

[0071] Furthermore, the first shaft portion is connected to the bottom end of the first lifting screw 6, so that when the first shaft portion rotates, the first lifting screw 6 rotates synchronously with the first shaft portion, and then the first lifting sleeve 5 drives the specimen upper shell 1 to rise or fall.

[0072] The structure and setting method of the second transmission component are the same as those of the first transmission component, which can be fully understood by those skilled in the art and will not be described in detail. It should be noted that the first transmission member 7 and the second transmission member are preferably bevel gears in the prior art, but of course, are not limited to this.

[0073] Preferably, the roller 3 is provided with a counting member for recording the number of teeth meshed after the roller 3 rotates a corresponding number of times, thereby determining the distance between the specimen upper shell 1 and the specimen base 2, and allowing the doctor to determine the gasket model during surgery.

[0074] More preferably, the first transmission member 7 and the second transmission member are each connected to a pressure detection component, which can be a pressure sensor. Taking the first transmission member 7 and the first pressure detection component as an example, the detection probe part of the first pressure detection component is arranged on the first transmission member 7, and is used to detect the pressure applied to the first transmission member 7 by the first worm 4 and the first transmission screw 6. The detection probe part of the first pressure detection component is electrically connected to a control device with a display screen, and the control device is located outside the adjustable knee replacement gasket specimen, so that the doctor can read the results conveniently. The setting method of the second pressure detection component is the same as above. By comparing the detection results of the two pressure detection components, the pressure distribution of the left and right halves of the adjustable knee replacement gasket specimen can be determined, and the doctor can determine the gap balance effect according to the intercondylar pressures on both sides displayed on the display screen.

[0075] In one embodiment of the present application, preferably, a marking scale is provided on the side wall of the roller 3 to indicate the angle through which the roller 3 rotates.

[0076] In this embodiment, a marking scale is provided on the side wall surface of the roller 3 for recording the angle through which the roller 3 rotates when the roller 3 is turned, so as to facilitate the operator to record and adjust the accuracy.

[0077] In one embodiment of the present application, preferably, the angle between the straight line where the first worm 4 is located and the straight line where the second worm 9 is located is 120 degrees.

[0078] Preferably, the first lifting screw 6 and the second lifting screw are both self-locking screws.

[0079] In this embodiment, the angle between the straight line where the first worm 4 is located and the straight line where the second worm 9 is located is 120 degrees, which helps to improve the stability of the overall structure of the adjustable knee replacement gasket specimen, especially the stability during the process of the specimen upper shell 1 being raised; and the first lifting screw 6 and the second lifting screw are self-locking screws, so that when the specimen upper shell 1 and the specimen base 2 are adjusted to the specified position, the specimen upper shell 1 can be locked with the specimen base 2 at the current position and current state, thereby preventing the specimen upper shell 1 from falling due to factors such as squeezing or its own gravity, affecting the accuracy of the adjustment result. Preferably, the screw pitch is 1mm, which can ensure that when the roller 3 is not turned, the first lifting mechanism and the second lifting mechanism are both in a self-locking state, and cannot convert external forces such as pressure into reverse torque transmission, thereby ensuring that the thickness adjustment of the adjustable knee replacement gasket specimen can only be achieved by adjusting the roller 3.

[0080] In summary, the adjustable knee replacement spacer specimen provided in the embodiment of the present application has at least the following advantages compared to the existing specimens / trial molds:

[0081] (1) The thickness can be adjusted by turning the knob, and the best gasket model required for knee replacement can be obtained after one installation, avoiding repeated replacement of gasket specimens during surgery, simplifying the surgical steps and shortening the operation time;

[0082] (2) There is no need to sterilize various types of gasket specimens for backup, which reduces the cost of sterilization and supply.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An adjustable knee replacement spacer specimen, characterized in that: include: The specimen base is hollow inside to form a containing space; The specimen upper shell is buckled on the specimen base; A first lifting mechanism is disposed in the containing space and abuts against the upper shell of the specimen; A second lifting mechanism is disposed in the accommodation space and abuts against the upper shell of the specimen; a transmission mechanism, which is in transmission connection with the first lifting mechanism and the second lifting mechanism, and is used to drive the first lifting mechanism and the second lifting mechanism to move relative to the specimen base, so as to adjust the distance between the specimen upper shell and the specimen base, and the specimen upper shell and the specimen base can be locked with each other after being adjusted to a specified position; The specimen base has a groove structure with an opening facing upward, and the interior of the groove structure forms the accommodation space; the specimen upper shell is buckled on the opening of the specimen base; A first fixing portion and a second fixing portion are arranged in the accommodating space at intervals, and the first fixing portion and the second fixing portion both have a tube structure or a groove structure; The first fixing portion and the second fixing portion are symmetrically arranged about a central axis extending along the width direction of the specimen base; The first lifting mechanism comprises: A first lifting sleeve is disposed in the first fixing portion, and one end of the first lifting sleeve is connected to a side surface of the specimen upper shell facing the accommodation space; A first lifting screw, at least partly disposed inside the first lifting sleeve and threadedly connected to the first lifting sleeve; The second lifting mechanism comprises: A second lifting sleeve is disposed in the second fixing portion, and one end of the second lifting sleeve is connected to a side surface of the specimen upper shell facing the accommodation space; A second lifting screw, at least partially disposed inside the second lifting sleeve and threadedly connected to the inner wall surface of the second lifting sleeve; Part of the side wall of the trough structure is bent toward the inside of the trough structure to form a notch portion, the notch portion is provided with a mounting base plate, and the mounting base plate is vertically provided with a connecting shaft; A first through hole and a second through hole are formed on a side wall of the notch.

2. The adjustable knee replacement spacer specimen according to claim 1, characterized in that: The transmission mechanism comprises: A roller is arranged on the connecting shaft, and the roller can rotate with the connecting shaft as the pivot center; gear teeth are formed on the side wall surface of the roller and the position connected to the side wall surface; the roller is provided with a counting member; The first transmission assembly comprises: a first worm and a first transmission member; the first transmission member comprises a first shaft portion and a first tooth portion arranged along the circumference of the first shaft portion; one end of the first worm is meshed with the gear teeth of the roller, the other end of the first worm passes through the first through hole and is meshed with the first tooth portion, the first shaft portion is connected to the first lifting screw; the first transmission member is connected to a first pressure detection component; The second transmission assembly includes: a second worm and a second transmission member; the second transmission member includes a second shaft portion and a second tooth portion arranged along the circumference of the second shaft portion; one end of the second worm is meshed with the gear teeth of the roller, and the other end of the second worm passes through the second through hole and is meshed with the second tooth portion, and the second shaft portion is connected to the second lifting screw; the second transmission member is connected to a second pressure detection component.

3. The adjustable knee replacement spacer specimen according to claim 2, characterized in that: The side wall of the roller is provided with marking scales for indicating the angle through which the roller has rotated.

4. The adjustable knee replacement spacer specimen according to claim 2, characterized in that: The angle between the straight line where the first worm gear is located and the straight line where the second worm gear is located is 120 degrees.

5. The adjustable knee replacement spacer specimen according to claim 1, characterized in that: The first lifting screw and the second lifting screw are both self-locking screws.

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