Femoral prosthesis placement limit measuring device in hip replacement surgery and its use method

Abstract

The present invention relates to the technical field of medical devices for hip replacement, and specifically to a limit measuring device for inserting a femoral prosthesis in hip replacement and a method for using the device, which is characterized in that it includes a limit measuring block and a fixing mechanism, wherein the fixing mechanism is used to fix the limit measuring block on the greater trochanter of the femur, and during the process of a presser driving the prosthesis, the limit measuring block can limit the presser and enable the presser to drive the prosthesis into a preset position. The present invention has a simple overall structure, is practical, and is easy to use, and can simply, effectively, and accurately reduce the unequal length of both lower limbs after surgery, thereby ensuring that the patient obtains a satisfactory length of both lower limbs after surgery.

Description

Technical Field

[0001] The invention relates to the technical field of hip replacement medical devices, and in particular to a femoral prosthesis placement limit measuring device in hip replacement surgery and a use method thereof. Background Art

[0002] The incidence of femoral neck fractures in the elderly continues to rise, accounting for 10.6% of all fractures in people over 60 years old, with the highest proportion in the age group of 76-80 years old. Hip replacement for the treatment of displaced femoral neck fractures in the elderly has achieved remarkable results in relieving pain and quickly restoring hip function, and has now become the main treatment method. However, unequal length of the lower limbs is common after hip replacement, which can lead to lameness, low back pain, scoliosis, prosthesis loosening, etc. It is generally believed that if the length of the lower limbs after surgery is more than 10mm, the functional improvement of rehabilitation exercises is limited, which is the main reason for poor function after hip replacement. Due to the destruction of anatomical landmarks caused by fractures, it is difficult to assess the length of the lower limbs before and during surgery. Restoring the complete equality of the lower limbs is a challenge for surgeons, and because each doctor's technique and experience are different, there will be errors, which will have a certain impact on the unequal length of the lower limbs after surgery. In addition, the hip function of these patients is usually good before fracture, so the expectation value is often relatively high. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a femoral prosthesis placement limit measuring device and a method for using the same during hip replacement surgery, which has a simple overall structure, is practical, and is easy to use, and can simply, effectively, and accurately reduce the unequal length of the lower limbs after surgery, thereby ensuring that the patient obtains a satisfactory length of the lower limbs after surgery.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a limit measuring device for the insertion of the femoral prosthesis in hip replacement surgery includes a limit measuring block and a fixing mechanism, the fixing mechanism is used to fix the limit measuring block on the greater trochanter of the femur, and in the process of the presser driving the prosthesis, the limit measuring block can limit the presser and enable the presser to drive the prosthesis to a preset position.

[0005] Furthermore, the limit measurement block is L-shaped and includes a vertical measuring plate and a horizontal limit plate which are arranged perpendicular to each other. The horizontal limit plate is provided with a limit hole through which the pressing head of the press can pass. The horizontal limit plate can limit the retaining ring of the press. At least one side of the left and right side surfaces of the vertical measuring plate is provided with a scale.

[0006] Furthermore, the fixing mechanism includes a fixing block, a locking assembly and a clamping assembly. The fixing block is U-shaped and has a through groove formed inside. The vertical measuring plate can be detachably arranged in the through groove and locked and fixed on the fixing block by the locking assembly. The fixing block is clamped and fixed on the greater trochanter by the clamping assembly.

[0007] Furthermore, the clamping assembly includes a clamping cavity, and the through groove on the fixed block extends backward to form a clamping cavity. The fixed block is detachably mounted on the greater trochanter through the clamping cavity. When the locking assembly locks the vertical measuring plate on the fixed block, the fixed block is also clamped and fixed on the greater trochanter through the clamping cavity.

[0008] Furthermore, a notch running through the left and right sides of the fixed block is provided at the lower part of one side of the open end, and a tooth-shaped clamping block is fixed on the fixed block at the bottom of the notch. There are two clamping blocks, which are respectively provided on the left and right sides of the fixed block.

[0009] Furthermore, the clamping assembly includes a first pliers member and a second pliers member, the first pliers member is rotatably connected to the second pliers member, the first pliers member includes a first pliers head and a first pliers handle, the second pliers member includes a second pliers head and a second pliers handle, the second pliers head is fixed on the fixed block, a locking rod is provided between the first pliers handle and the second pliers handle, one end of the locking rod is rotatably connected to the first pliers handle, the other end of the locking rod passes through a connecting hole on the second pliers handle and is threadedly connected to a knob nut, and the terminal end of the first pliers head is flat and pointed.

[0010] Furthermore, the first clamp head and the second clamp head are both in arc shape, and the first clamp head and the second clamp head are both bent toward one side of the fixing block.

[0011] Furthermore, a guide assembly is provided between the fixed block and the vertical measuring plate, the guide assembly includes a guide block and a guide groove, the guide block is adapted to the guide groove, there are two guide blocks and are respectively fixed on the left and right side surfaces of the vertical measuring plate, there are two guide grooves and are respectively provided on the left and right side inner surfaces of the through groove of the fixed block, the guide groove runs through the upper and lower ends of the fixed block, the guide block is clamped in the guide groove and the two are slidably matched.

[0012] Furthermore, the locking assembly includes a knob screw and a locking nut. The fixed block is provided with a through hole passing through the left and right side surfaces. A locking nut is fixed at the through hole on one side surface of the fixed block. A strip slot is provided on the vertical measuring plate. The screw on the knob screw can pass through the through hole and the strip slot and be threadedly connected to the locking nut. When the knob screw is tightened, the fixed block can undergo elastic deformation and clamp the vertical measuring plate.

[0013] A method for using a limit measuring device for placement of a femoral prosthesis in hip replacement surgery, using any one of the above limit measuring devices for placement of a femoral prosthesis in hip replacement surgery, comprises the following steps:

[0014] Step 1: Mark the “shoulder” of the femur before osteotomy and confirm again after osteotomy;

[0015] Step 2: Insert the prosthesis into the femur until it is close to shoulder-to-shoulder position;

[0016] Step 3: Install the limit measuring block on the fixed block;

[0017] Step 4: Fix the fixation block to the greater trochanter of the femur by means of a clamping assembly;

[0018] Step 5: Continue to drive the prosthesis further into the body through the press. During the driving process, the horizontal limit plate can limit the retaining ring of the press to prevent the pressing head of the press from driving the prosthesis too deep, so as to drive the prosthesis into the preset position of the shoulder-to-shoulder state;

[0019] Step 6: After the operation, the depressor and the limit measuring device can be removed.

[0020] As can be seen from the above description, the overall structure of the femoral prosthesis insertion limit measuring device in hip replacement surgery provided by the present invention is simple, practical and easy to use. Through the setting of the fixing mechanism, the limit measuring block can be stably fixed on the greater trochanter; through the setting of the limit measuring block, the pressure device can be limited, thereby preventing the pressure device from driving the prosthesis too deep, thereby ensuring that the shoulder of the prosthesis and the shoulder of the femur are aligned as much as possible, and the postoperative unequal length of the lower limbs can be reduced simply, effectively and accurately, thereby ensuring that the patient obtains a satisfactory length of the lower limbs after surgery; in addition, through the use of the limit measuring device, the surgical errors caused by the different techniques and experiences of each doctor can be well avoided, thereby minimizing the impact of the postoperative unequal length of the lower limbs of the patient; by making the limit measuring block and the fixing block detachable, it is convenient to remove the limit measuring block from the fixing block and install it in reverse, thereby making the limit measuring device suitable for hip replacement surgery on the left or right side of different patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the limit measuring device for the placement of the femoral prosthesis in hip replacement surgery in the first embodiment of the present invention.

[0022] Figure 2 for Figure 1 A local enlarged schematic diagram of point A in the middle.

[0023] Figure 3 It is a top view of the limit measuring device for the placement of the femoral prosthesis in hip replacement surgery in the first embodiment of the present invention.

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the fixing block in the first embodiment.

[0025] Figure 5 It is a schematic diagram of the structure of the suppressor.

[0026] Figure 6Schematic diagram of the use status of the femoral prosthesis placement limit measuring device in hip replacement surgery in the first embodiment of the present invention.

[0027] Figure 7 It is a schematic diagram of the structure of the limit measuring device for the placement of the femoral prosthesis in hip replacement surgery in the second embodiment of the present invention.

[0028] Figure 8 It is a schematic diagram of the three-dimensional structure decomposition of the femoral prosthesis placement limit measuring device in hip replacement surgery in the second embodiment of the present invention.

[0029] Fig. 9 for Figure 8 A local enlarged schematic diagram of point A in the middle.

[0030] Fig.10 The diagram is a schematic diagram of the use state of one angle of the femoral prosthesis placement limit measuring device in hip replacement surgery in the second embodiment of the present invention.

[0031] Fig.11 Schematic diagram of another angle of use of the femoral prosthesis placement limit measuring device in hip replacement surgery in the second embodiment of the present invention.

[0032] In the figure: 1-limit measuring block; 11-vertical measuring plate; 111-scale; 112-strip notch; 12-horizontal limit plate; 121-limit hole; 21-fixing block; 211-through slot; 212-notch; 213-block; 214-through hole; 22-locking assembly; 221-knob screw; 222-locking nut; 23-clamping cavity; 241-first pliers; 2411-first pliers head; 2412-first pliers handle; 242-second pliers; 2421-second pliers head; 2422-second pliers handle; 243-locking rod; 244-knob nut; 3-femur; 31-greater trochanter; 4-pressor; 41-pressing head; 42-retaining ring; 5-guide assembly; 51-guide block; 52-guide groove; 6-prosthesis. DETAILED DESCRIPTION

[0033] The present invention is further described below through specific implementation modes.

[0034] Embodiment 1

[0035] like Figures 1 to 6 As shown, the femoral side prosthesis insertion limit measuring device in hip replacement surgery described in the present invention includes a limit measuring block 1 and a fixing mechanism, and the fixing mechanism is used to fix the limit measuring block 1 on the greater trochanter 31 of the femur 3. During the process of the presser 4 driving the prosthesis 6, the limit measuring block 1 can limit the presser 4 and enable the presser 4 to drive the prosthesis 6 to a preset position.

[0036] The applicant of this patent found in several clinical operations of total hip replacement or hemi-hip replacement that the intraoperative anatomical alignment method of "shoulder to shoulder" on the side of femur 3 is to match the "shoulder" of prosthesis 6 with the "shoulder" of femur 3 itself, restore the patient's anatomy before fracture, and thus achieve the patient's inherent anatomical alignment relationship. In most cases, the length difference of both lower limbs after surgery is within 10 mm, the satisfaction rate of both lower limb lengths after surgery is high, and the functional anatomy of the patient's original joint can be restored. Specifically, the "shoulder" of femur 3 is located at the transition between the back and the top of femur 3, that is, at the level of the pyriform fossa of the trochanter of femur 3, and the "shoulder" of prosthesis 6 is located at the extension of the base of prosthesis 6. The "shoulder" of femur 3 is marked before osteotomy and confirmed again after osteotomy. After the prosthesis 6 is inserted, the "shoulder" of prosthesis 6 reaches the level of the marked "shoulder" of femur 3, that is, "shoulder to shoulder".

[0037] By setting the fixing mechanism, the limit measuring block 1 can be stably fixed on the greater trochanter 31; by setting the limit measuring block 1, the presser 4 can be limited, thereby preventing the presser 4 from driving the prosthesis 6 too deeply, thereby ensuring that the shoulder of the prosthesis 6 is aligned with the shoulder of the femur 3 as much as possible, and can simply, effectively and accurately reduce the postoperative inequality of the lower limbs, thereby ensuring that the patient obtains a satisfactory length of the lower limbs after surgery; in addition, by using the limit measuring device, surgical errors caused by different techniques and experiences of each doctor can be avoided, thereby minimizing the impact of the postoperative inequality of the lower limbs on the patient.

[0038] The limit measuring block 1 is in an L shape and includes a vertical measuring plate 11 and a horizontal limit plate 12 which are perpendicular to each other. The horizontal limit plate 12 is provided with a limit hole 121 through which the pressing head 41 of the press 4 can pass. The horizontal limit plate 12 can limit the retaining ring 42 of the press 4. Since the pressing head 41 and the retaining ring 42 are provided at the head of the press 4, the pressing head 41 can pass through the limit hole 121, and the retaining ring 42 cannot pass through the limit hole 121. Therefore, while ensuring that the pressing head 4 While the prosthesis 6 can be pressed through the limiting hole 121, the horizontal limiting plate 12 can also play a certain limiting role on the retaining ring 42 to prevent the prosthesis 6 from being driven too deep. At least one side of the left and right surfaces of the vertical measuring plate 11 is provided with a scale 111 to further facilitate measurement. After the operation is completed, the distance between the shoulder of the prosthesis 6 and the shoulder of the femur 3 can be measured, thereby predicting the possible length difference of the affected limb after the operation. Preferably, the left and right surfaces of the vertical measuring plate 11 are both provided with the scale 111.

[0039] Specifically, the fixing mechanism includes a fixing block 21, a locking assembly 22 and a clamping assembly. The fixing block 21 is U-shaped and has a through groove 211 formed inside. The vertical measuring plate 11 can be detachably arranged in the through groove 211 and locked and fixed to the fixing block 21 by the locking assembly 22. The fixing block 21 is clamped and fixed to the greater trochanter 31 by the clamping assembly. By making the limit measuring block 1 and the fixing block 21 detachable, it is convenient to remove the limit measuring block 1 from the fixing block 21 and install it in reverse, so that the limit measuring device can be suitable for left or right hip replacement surgery of different patients.

[0040] Specifically, the clamping assembly includes a clamping cavity 23, the through groove 211 on the fixed block 21 extends backward and forms the clamping cavity 23, the fixed block 21 is detachably mounted on the greater trochanter 31 through the clamping cavity 23, and while the locking assembly 22 locks and fixes the vertical measuring plate 11 on the fixed block 21, it also enables the fixed block 21 to be clamped and fixed on the greater trochanter 31 through the clamping cavity 23. When the limit measuring device needs to be removed, it is only necessary to loosen the locking assembly 22 to conveniently detach the fixed block 21 from the greater trochanter 31, thereby removing the limit measuring device.

[0041] In addition, a notch 212 is provided on the lower part of one side of the open end of the fixing block 21, which runs through the left and right sides thereof. Preferably, the notch 212 is in the shape of a right-angled trapezoid, so that the fixing block 21 can better adapt to the greater trochanter 31, further improving the stability of the limit measuring device after installation. A tooth-shaped clamping block 213 is fixedly provided on the fixing block 21 at the bottom of the notch 212. There are two clamping blocks 213, which are respectively arranged on the left and right sides of the fixing block 21. Through the setting of the tooth-shaped clamping block 213, the fixing block 21 can better hook the muscles around the greater trochanter 31 from the outside through the clamping block 213, and cooperate with the use of the locking assembly 22 to further make the limit measuring device more stably fixed on the greater trochanter 31.

[0042] A guide assembly 5 is also provided between the fixed block 21 and the vertical measuring plate 11, and the guide assembly 5 includes a guide block 51 and a guide groove 52. The guide block 51 is adapted to the guide groove 52. There are two guide blocks 51 and they are fixedly provided on the left and right side surfaces of the vertical measuring plate 11 respectively. There are two guide grooves 52 and they are provided on the left and right side inner surfaces of the through groove 211 of the fixed block 21 respectively. The guide groove 52 runs through the upper and lower ends of the fixed block 21. The guide block 51 is clamped in the guide groove 52 and the two are slidably matched. By adopting this structure, the smoothness of the limit measurement block 1 when moving on the fixed block 21 can be effectively ensured, which is convenient for the subsequent measurement of the vertical measuring plate 11. At the same time, it can also further improve the stability of the connection between the limit measurement block 1 and the fixed block 21 when the two are locked and fixed.

[0043] The locking assembly 22 includes a knob screw 221 and a locking nut 222. The fixing block 21 is provided with a through hole 214 penetrating the left and right side surfaces. The locking nut 222 is fixedly provided at the through hole 214 on one side surface of the fixing block 21. The vertical measuring plate 11 is provided with a strip notch 112. The screw on the knob screw 221 can pass through the through hole 214 and the strip notch 112 and be threadedly connected with the locking nut 222. When the knob screw 221 is tightened, the fixing block 21 can be elastically deformed and clamp the vertical measuring plate 11. By adopting this structural arrangement By rotating the knob screw 221 and driving the screw to be threadedly connected with the locking nut 222, the open end of the fixed block 21 can be squeezed and the open end of the fixed block 21 can undergo a certain elastic deformation and clamp the vertical measuring plate 11, thereby locking and fixing the limit measuring block 1 on the fixed block 21. In addition, through the setting of the strip-shaped notch 112, the limit measuring block 1 can be better locked and fixed on the fixed block 21. At the same time, when the knob screw 221 is loosened, it can also ensure that the limit measuring block 1 is not easily separated and dropped directly from the fixed block 21.

[0044] Embodiment 2

[0045] like Figures 7 to 11As shown, the difference between this embodiment and the first embodiment is that the clamping assembly includes a first clamp member 241 and a second clamp member 242, the first clamp member 241 is rotatably connected to the second clamp member 242, the first clamp member 241 includes a first clamp head 2411 and a first clamp handle 2412, the second clamp member 242 includes a second clamp head 2421 and a second clamp handle 2422, the second clamp head 2421 is fixedly arranged on the fixed block 21, a locking rod 243 is provided between the first clamp handle 2412 and the second clamp handle 2422, one end of the locking rod 243 is rotatably connected to the first clamp handle 2412, the other end of the locking rod 243 passes through the connecting hole on the second clamp handle 2422 and is threadedly connected with a knob nut 244, the terminal end of the first clamp head 2411 is flat and pointed, by adopting this structure, when in use, the first clamp head 2411 can be first inserted into the muscle and pressed against the thigh The first clamp head 2411 and the second clamp head 2421 are arranged on the outside of the greater trochanter 31 of the femur 3, and the second clamp head 2421 is located on the inside of the greater trochanter 31 of the femur 3, and then the knob nut 244 is tightened, and the locking rod 243 is used to drive the second clamp member 242 to rotate on the first clamp member 241, so that the first clamp head 2411 and the second clamp head 2421 clamp the greater trochanter 31 of the femur 3, thereby the fixing block 21 can be well fixed to the greater trochanter 31 of the femur 3, and it can well adapt to the greater trochanter 31 of the femur 3 of different widths on different patients, and its applicability is good. When it is necessary to remove the limit measuring device, it is only necessary to loosen the knob nut 244 so that the first clamp head 2411 and the second clamp head 2421 no longer clamp the greater trochanter 31 of the femur 3, and at this time, the limit measuring device can be conveniently removed. In addition, by setting the terminal end of the first clamp head 2411 to a flat tip shape, it is convenient for the first clamp head 2411 to be smoothly inserted into the muscle.

[0046] The first clamp head 2411 and the second clamp head 2421 are both arc-shaped, and the first clamp head 2411 and the second clamp head 2421 are both bent toward the side of the fixing block 21, so that the shapes of the first clamp head 2411 and the second clamp head 2421 can better fit the anatomical shape characteristics of the greater trochanter 31 of the femur 3, thereby, the first clamp head 2411 and the second clamp head 2421 can be clamped on the greater trochanter 31 of the femur 3 more stably.

[0047] Other technical features are the same as those in Embodiment 1.

[0048] A method for using a limit measuring device for placement of a femoral prosthesis in hip replacement surgery, using any one of the above limit measuring devices for placement of a femoral prosthesis in hip replacement surgery, comprises the following steps:

[0049] Step 1: Mark the "shoulder" of the femur 3 before osteotomy and confirm it again after osteotomy. In addition, the preoperative tip-shoulder distance between the "shoulder" of the femur 3 and the tip (i.e., top) of the greater trochanter 31 of the femur 3 can also be measured by a ruler or a vertical measuring plate 11 on the limit measuring device;

[0050] Step 2: insert the prosthesis 6 into the femur 3 until it is close to the shoulder-to-shoulder state;

[0051] Step 3: Install the limit measuring block 1 on the fixed block 21. In addition, the installation position of the limit measuring block 1 on the fixed block 21 can be determined by the measured preoperative tip-shoulder distance, the length of the pressing head 41 of the pressing device 4, and the thickness of the horizontal limit plate 12;

[0052] Step 4: Fix the fixing block 21 to the greater trochanter 31 of the femur 3 by means of a clamping assembly;

[0053] Step 5: Continue to further drive the prosthesis 6 through the press 4. During the driving process, the horizontal limit plate 12 can limit the retaining ring 42 of the press 4 to prevent the pressing head 41 of the press 4 from driving the prosthesis 6 too deep, so as to drive the prosthesis 6 to the preset position of the shoulder-to-shoulder state, that is, to ensure that the "shoulder" of the prosthesis 6 is aligned and flush with the "shoulder" of the femur 3;

[0054] Step 6: After the operation, the suppressor 4 and the limit measuring device can be removed. In addition, the postoperative tip-to-shoulder distance between the "shoulder" of the prosthesis 6 and the tip (i.e., top) of the greater trochanter 31 of the femur 3 can be measured by a ruler or the vertical measuring plate 11, and compared with the preoperative tip-to-shoulder distance to see whether the shoulder-to-shoulder is well achieved. At the same time, it is also convenient for subsequent research on the comparison data to further understand whether there is a positive correlation between the postoperative affected limb length and the tip-to-shoulder distance.

[0055] The above are only some specific implementation methods of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A limit measuring device for the placement of a femoral prosthesis in hip replacement surgery, characterized in that: It includes a limit measuring block and a fixing mechanism, wherein the fixing mechanism is used to fix the limit measuring block on the greater trochanter of the femur, and when the presser is used to drive the prosthesis into the prosthesis, the limit measuring block can limit the presser and enable the presser to drive the prosthesis into a preset position, and the limit measuring block is L-shaped and includes a vertical measuring plate and a horizontal limit plate which are perpendicularly arranged to each other, and the horizontal limit plate is provided with a limit hole for the pressing head of the presser to pass through, and the horizontal limit plate can limit the retaining ring of the presser.

2. The femoral prosthesis placement limit measuring device in hip replacement according to claim 1, characterized in that: At least one of the left and right surfaces of the vertical measuring plate is provided with a scale.

3. The femoral prosthesis placement limit measuring device in hip replacement according to claim 2, characterized in that: The fixing mechanism includes a fixing block, a locking assembly and a clamping assembly. The fixing block is U-shaped and has a through groove formed inside. The vertical measuring plate can be detachably arranged in the through groove and locked and fixed on the fixing block by the locking assembly. The fixing block is clamped and fixed on the greater trochanter by the clamping assembly.

4. The femoral prosthesis placement limit measuring device in hip replacement according to claim 3, characterized in that: The clamping assembly includes a clamping cavity, the through groove on the fixing block extends backward and forms the clamping cavity, the fixing block is detachably mounted on the greater trochanter through the clamping cavity, and while the locking assembly locks and fixes the vertical measuring plate to the fixing block, the fixing block is also clamped and fixed to the greater trochanter through the clamping cavity.

5. The femoral prosthesis placement limit measuring device in hip replacement according to claim 4, characterized in that: A notch running through the left and right sides of the fixed block is provided at the lower part of one side of the open end of the fixed block, and a tooth-shaped clamping block is fixedly provided on the fixed block at the bottom of the notch. The clamping blocks are two and are respectively arranged on the left and right sides of the fixed block.

6. The femoral prosthesis placement limit measuring device in hip replacement according to claim 3, characterized in that: The clamping assembly includes a first pliers member and a second pliers member, the first pliers member is rotatably connected to the second pliers member, the first pliers member includes a first pliers head and a first pliers handle, the second pliers member includes a second pliers head and a second pliers handle, the second pliers head is fixed on the fixed block, a locking rod is provided between the first pliers handle and the second pliers handle, one end of the locking rod is rotatably connected to the first pliers handle, the other end of the locking rod passes through a connecting hole on the second pliers handle and is threadedly connected with a knob nut, and the terminal end of the first pliers head is flat and pointed.

7. The limit measuring device for inserting the femoral prosthesis in hip replacement according to claim 6, characterized in that: The first clamp head and the second clamp head are both in arc shape, and the first clamp head and the second clamp head are both bent toward one side of the fixing block.

8. The limit measuring device for inserting the femoral prosthesis in hip replacement according to claim 3, characterized in that: A guide assembly is also provided between the fixed block and the vertical measuring plate, and the guide assembly includes a guide block and a guide groove. The guide block is adapted to the guide groove. There are two guide blocks and they are respectively fixed on the left and right side surfaces of the vertical measuring plate. There are two guide grooves and they are respectively provided on the left and right side inner surfaces of the through groove of the fixed block. The guide groove runs through the upper and lower ends of the fixed block. The guide block is clamped in the guide groove and the two are slidably matched.

9. The limit measuring device for inserting the femoral prosthesis in hip replacement according to claim 3, characterized in that: The locking assembly includes a knob screw and a locking nut. The fixing block is provided with a through hole penetrating the left and right side surfaces. The locking nut is fixedly provided at the through hole on one side surface of the fixing block. The vertical measuring plate is provided with a strip notch. The screw on the knob screw can pass through the through hole and the strip notch and be threadedly connected with the locking nut. When the knob screw is tightened, the fixing block can be elastically deformed and clamp the vertical measuring plate.

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