Lower limb force line measuring device

Abstract

The invention relates to the technical field of medical instruments, and discloses a lower limb force line measuring device which comprises a fixing assembly and a force line rod, the force line rod is provided with two connecting ends, one connecting end is provided with a first developing ring, and the first developing ring is connected with the fixing assembly through an adjusting part; the adjusting part is provided with a first moving direction and a second moving direction, and the first moving direction is perpendicular to the second moving direction. The second developing ring is arranged at the other connecting end of the force line rod, a clamping claw is arranged on the second developing ring, and the clamping claw is used for restraining the second developing ring in the projection of the ankle bone in the horizontal plane; in the operation process, the knee joint ectropion and ectropion osteotomy correction condition can be judged in real time, the lower limb force line of a patient is confirmed, and the operation effect is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a lower limb force line measurement device. Background Technology

[0002] In orthopedic surgeries such as knee osteotomy, accurate determination of the lower limb force line is the core link to ensure the surgical outcome. Traditional clinical practice often relies on preoperative X-ray imaging to assess the degree of joint damage and the angle of force line deviation in order to formulate a personalized osteotomy plan.

[0003] However, the preoperative plan is difficult to verify in real time during the operation. During the operation, it is impossible to intuitively and accurately determine whether the osteotomy angle has reached the expected result. This can easily lead to insufficient or excessive force line correction, which in turn affects the postoperative joint pressure distribution and causes problems such as pain, limited mobility, or even surgical failure.

[0004] At the same time, the existing intraoperative force line measurement device has poor fixation stability and limited adjustment range of the locator, making it difficult to adapt to the anatomical differences of patients with different body types. Doctors find it difficult to adjust the osteotomy angle in a timely manner based on fluoroscopic results, and mostly rely on experience to make judgments, which is not suitable for this type of orthopedic surgery. Summary of the Invention

[0005] This invention provides a lower limb force line measurement device. Through the force line rod, the first imaging ring and the second imaging ring, a limb force line from the center of the hip joint to the midpoint of the ankle joint can be formed. Combined with fluoroscopic assistance, the center of the hip and ankle joints can be located, so as to directly observe the position of the force line rod. This solves the problem mentioned in the background art that it is difficult to adjust the osteotomy angle in time according to the fluoroscopic results, and most of the time it relies on experience judgment, which is difficult to adapt to this kind of orthopedic surgery.

[0006] This invention provides the following technical solution: A lower limb force line measuring device includes a fixing component and further includes: a force line rod having two connecting ends, one of which is provided with a first imaging ring, the first imaging ring being connected to the fixing component via an adjustment part, the adjustment part being provided with a first moving direction and a second moving direction, the first moving direction and the second moving direction being perpendicular; and a second imaging ring disposed at the other connecting end of the force line rod, the second imaging ring being provided with a clamping claw for constraining the second imaging ring within the projection of the ankle bone in the horizontal plane.

[0007] As a preferred embodiment of the present invention, the force line rod includes a sleeve and a connecting rod. The first developing ring is disposed at the free end of the sleeve, and the connecting rod is slidably disposed on the sleeve for reciprocating movement along its opening direction. The second developing ring is disposed at the free end of the connecting rod.

[0008] As a preferred embodiment of the present invention, the connecting rod includes a first connecting rod and a second connecting rod. One end of the second connecting rod is slidably connected inside the sleeve, and the other end of the second connecting rod has an internal threaded hole. An external threaded connecting post is provided on the end of the first connecting rod away from the second developing ring, and the external threaded connecting post is adapted to the internal threaded hole.

[0009] As a preferred embodiment of the present invention, a first limiting plate and a second limiting plate are fixedly connected to both sides of the first developing ring, a second locking bolt is threadedly connected to the first limiting plate, and the force line rod is fixedly connected to the second limiting plate.

[0010] As a preferred embodiment of the present invention, the force line rod extends rigidly along its own axial direction.

[0011] As a preferred embodiment of the present invention, the fixing component includes a C-shaped clamp, on which an adjusting screw is threadedly connected. One end of the adjusting screw is provided with a crossbar, and the other end of the adjusting screw is provided with a locking element for clamping the side crossbar of the operating table by rotating the adjusting screw.

[0012] As a preferred embodiment of the present invention, the C-shaped clamp is provided with an adjusting rod, a positioning rod is slidably connected to the adjusting rod, and a first locking bolt is threadedly connected to the positioning rod, the first locking bolt being adapted to the adjusting rod.

[0013] As a preferred embodiment of the present invention, a buffer pad is provided on the top of the locking member.

[0014] As a preferred embodiment of the present invention, the clamping claw is provided with a connecting plate, the second developing ring is provided with a first connecting hole, and the connecting plate is provided with a second connecting hole. A rod-shaped member is sequentially inserted into the first connecting hole and the second connecting hole to realize a detachable connection between the connecting plate and the second developing ring.

[0015] As a preferred embodiment of the present invention, the gripper is provided with an anti-slip pad on its claw wall.

[0016] Compared with the prior art, the present invention provides a lower limb force line measuring device, which has the following beneficial effects: 1. In this lower limb force line measurement device, the force line rod, the first imaging ring and the second imaging ring can form a lower limb force line from the center of the hip joint to the midpoint of the ankle joint. Combined with fluoroscopic assistance, the center of the hip and ankle joints can be located, so as to directly observe the position of the force line rod. The knee joint varus and valgus osteotomy correction can be judged in real time during the operation, the patient's lower limb force line can be confirmed, and the surgical effect can be guaranteed.

[0017] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This invention can determine the knee joint varus / valgus osteotomy correction status and confirm the patient's lower limb alignment in real time during surgery, thus ensuring the surgical effect. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

[0019] Figure 1 This is a schematic diagram of the entire invention; Figure 2 This is a schematic diagram of the first developing ring of the present invention; Figure 3 This is a schematic diagram of the sleeve of the present invention; Figure 4 This is a schematic diagram of the first connecting rod of the present invention.

[0020] In the diagram: 100, fixing component; 101, adjusting screw; 102, crossbar; 103, locking component; 200, adjusting rod; 300, positioning rod; 301, first locking bolt; 400, scale marking; 500, first developing ring; 501, first limiting plate; 502, second limiting plate; 503, second locking bolt; 600, force line rod; 601, sleeve; 6011, internal threaded hole; 602, first connecting rod; 6021, external threaded connecting post; 603, second connecting rod; 700, second developing ring; 701, first connecting hole; 800, clamping claw; 801, anti-slip pad; 900, connecting plate; 901, second connecting hole. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0022] Example: Reference Figures 1-4This invention provides a lower limb force line measuring device, the basic components of which mainly include a fixing assembly 100, comprising a C-shaped clamp body fixedly connected to an adjusting rod 200, an adjusting screw 101, a crossbar 102, and a locking member 103. The C-shaped clamp body has a C-shaped structure, adapted to the shape of the side crossbar of the operating table. The adjusting screw 101 is threadedly connected to one side wall of the C-shaped clamp body, with one end connected to the crossbar 102 for easy rotation and adjustment by the operator, and the other end connected to the locking member 103. The top of the locking member 103 is provided with a buffer pad, mainly made of rubber, which increases the contact area with the operating table crossbar, preventing injury to the table and improving the stability of the fixation. By rotating the crossbar 102, the adjusting screw 101 is rotated, causing the locking member 103 to move closer to the other side wall of the C-shaped clamp body, thereby firmly fixing the device to the side crossbar of the operating table.

[0023] Specifically, the adjusting rod 200 is fixedly connected to the top of the C-shaped clamp, and the positioning rod 300 is slidably sleeved on the adjusting rod 200, sliding along the axial direction of the adjusting rod 200 to accommodate different patients. Furthermore, a first locking bolt 301 is threaded onto the positioning rod 300. When the positioning rod 300 slides to the appropriate position, the first locking bolt 301 is tightened, causing its end to press against the side wall of the adjusting rod 200, thus fixing the position of the positioning rod 300 and preventing displacement during surgery. The positioning rod 300 also has scale markings 400 evenly distributed along the axial direction of the positioning rod 300, which assists the operator in adjusting the position of the first imaging ring 500.

[0024] Specifically, the first imaging ring 500, acting as a hip joint center locator, is slidably mounted on the positioning rod 300 and can slide along the axial direction of the positioning rod 300 to match the left and right positions of the patient's hip joint center. The first imaging ring 500 is a imaging metal ring with a diameter that matches the diameter of the femoral head of the acetabulum in the human body. It can be clearly visualized under intraoperative C-arm X-ray fluoroscopy. Under intraoperative X-ray fluoroscopy, the first imaging ring 500 appears as a imaging metal ring with a diameter of approximately 5 cm (because the diameter of the femoral head of the acetabulum is approximately 5 cm). The first limiting plate 501 and the second limiting plate 502 are fixedly connected to the two sides of the first imaging ring 500, respectively. The first limiting plate 501 is threaded with a second locking bolt 503. When the first imaging ring 500 slides to directly above the center of the hip joint, the second locking bolt 503 is tightened so that its end abuts against the side wall of the positioning rod 300, thereby fixing the position of the first imaging ring 500.

[0025] Specifically, the second imaging ring 700, acting as an ankle joint midpoint locator, is fixedly connected to the other end of the first connecting rod 602. It has a horizontal ruler structure, perpendicular to the midline of the lower leg, and can be clearly visualized under intraoperative X-ray fluoroscopy, facilitating the location of the midpoint of the line connecting the medial and lateral malleoli. The force line rod 600, together with the first imaging ring 500 and the second imaging ring 700, forms a stable force line reference structure, which is essentially a straight line. A connecting plate 900 is also provided on the top of the gripper 800. In the working state, when the gripper 800 grips the patient's ankle, the connecting plate 900 is vertically upward. The second imaging ring 700 has a first connecting hole 701, and the connecting plate 900 has a second connecting hole 901. A rod-shaped member is sequentially inserted into the first connecting hole 701 and the second connecting hole 901 to achieve a detachable connection between the connecting plate 900 and the second imaging ring 700. The rod-shaped member can be a metal rod or a Kirschner wire. Kirschner wires are commonly used instruments in orthopedic surgery. Various diameter Kirschner wires are also equipped in the operating room to sequentially insert into the first connecting hole 701 and the second connecting hole 901, so that the connecting plate 900 and the second imaging ring 700 can be detached or installed. At the same time, the position of the rod-shaped member on the first connecting hole 701 and the second connecting hole 901 can be adjusted according to the actual height position of the patient's leg to adapt to different patients.

[0026] Specifically, the second contrast-enhancing ring 700 can be used for X-ray imaging. The clamping claw 800 is used to hold the patient's lower leg at the center of the ankle joint. It constrains the second contrast-enhancing ring 700 within the ankle bone region and limits its location within the horizontal projection of the ankle bone, allowing the surgeon to compare the position of the ankle bone through the second contrast-enhancing ring 700. Specifically, the clamping claw 800 is 20cm long, larger than existing similar devices, increasing the contact area with the lower leg. Its claw wall is equipped with anti-slip pads 801 to increase friction and prevent displacement during surgery. The connecting plate 900 is made of reusable medical-grade material, facilitating postoperative disinfection and reuse.

[0027] The claw 800 is made of transparent plastic.

[0028] Specifically, the force line rod 600 is mainly composed of a sleeve 601 and connecting rods (first connecting rod 602 and second connecting rod 603). The first connecting rod 602 and the second connecting rod 603 are detachably connected. The first developing ring 500 is disposed at the free end of the sleeve 601, and the second developing ring 700 is disposed at the free end of the first connecting rod 602. The connecting rod is slidably disposed on the sleeve 601 for reciprocating movement along its opening direction. The second developing ring 700 is disposed on the second connecting rod 603. Specifically, one end of the second connecting rod 603 is slidably connected inside the sleeve 601, and the other end of the second connecting rod 603 has an internal threaded hole 6011. A sliding groove is provided inside the sleeve 601, and a slider is provided on the second connecting rod 603. Through the sliding engagement of the slider and the sliding groove, the second connecting rod 603 can slide on the sleeve 601. Furthermore, the sleeve 601 is mounted on the second limiting plate. On 502, an internal threaded hole 6011 is provided on the second connecting rod 603. The first connecting rod 602 can be threadedly connected to the second connecting rod 603. That is, an external threaded connecting post 6021 is provided on the end of the first connecting rod 602 away from the second imaging ring 700. The external threaded connecting post 6021 on the first connecting rod 602 and the internal threaded hole 6011 on the second connecting rod 603 can be threadedly connected. The overall length of the force line rod 600 can be adjusted by sliding the second connecting rod 603 to adapt to the height and leg length of adult patients. At the same time, the outer diameter of the second connecting rod 603 and the first connecting rod 602 are the same. The second connecting rod 603 can be directly removed and the first connecting rod 602 can be directly inserted into the sleeve 601 to shorten the overall length of the force line rod 600 to adapt to the height and leg length of minors or children. It also facilitates subsequent disassembly, packaging and sterilization.

[0029] The working principle is as follows: Before surgery, all components of the device are sterilized by high-pressure steam to ensure sterility. The sleeve 601 of the force line rod 600 is connected to the first connecting rod 602 by threaded connection to form a complete rod body. At the same time, the position of the sleeve 601 on the force line rod 600 is adjusted to achieve self-adjustment. The force line rod 600 extends rigidly along its own axis and is mainly made of stainless steel to facilitate sterilization and maintain a straight imaging state during intraoperative X-ray positioning, which is beneficial for the doctor's direct comparison.

[0030] The patient is placed supine on the operating table. The C-shaped clamp of the fixing component 100 is engaged with the side crossbar of the operating table. The crossbar 102 is rotated to drive the adjusting screw 101 to rotate, so that the locking component 103 clamps the side crossbar of the operating table. The patient's hip joint is then examined by X-ray fluoroscopy to observe the imaging position of the first imaging ring 500. The position of the force line rod 600 is then adjusted by the adjusting part. The specific adjustment is as follows: the sliding positioning rod 300 is moved along the adjusting rod 200 (this is the first direction of movement), and at the same time, the first imaging ring 500 is moved along the positioning rod 300 (this is the second direction of movement) until the center of the first imaging ring 500 coincides with the rotation center of the patient's hip joint. The first locking bolt 301 and the second locking bolt 503 are tightened to fix the position of the positioning rod 300 and the first imaging ring 500. The clamping claw 800 is then clamped at the center of the patient's lower leg ankle joint, and the anti-slip pad 801 is used to improve the clamping stability.

[0031] By fluoroscopically examining the patient's ankle joint, the imaging position of the second imaging ring 700 is observed. The vertical and horizontal positions of the second imaging ring 700 are manually adjusted until the horizontal axis of the second imaging ring 700 coincides with the line connecting the medial and lateral malleoli of the patient's ankle joint. This ensures that the center of the second imaging ring 700 coincides with the midpoint of the ankle joint. At this point, the force line rod 600, the first imaging ring 500, and the second imaging ring 700 can form a limb force line from the center of the hip joint to the midpoint of the ankle joint. By fluoroscopically examining the patient's knee joint, the imaging position of the force line rod 600 is observed to determine whether the force line passes through the midpoint of the medial and lateral tibial condyles of the knee joint or the preoperatively designed target position. If the force line deviates, the angle of the knee osteotomy is adjusted promptly until the force line meets the expectation. If the force line is normal, the osteotomy and fixation operation continues, which involves opening the osteotomy to the predetermined height, adjusting the angle, and then fixing it with plates and screws.

[0032] After the surgery, remove the clamping claw 800, unscrew the threaded connection between the sleeve 601 and the first connecting rod 602, disassemble it into two sections, and disinfect and package it together with other parts for future use.

[0033] In the above scheme, the force line rod 600, the first imaging ring 500 and the second imaging ring 700 can form the lower limb force line from the center of the hip joint to the midpoint of the ankle joint. Combined with fluoroscopic assistance, the center of the hip and ankle joints can be located, so that the position of the force line rod 600 can be directly observed. The knee joint varus and valgus osteotomy correction can be judged in real time during the operation, the patient's lower limb force line can be confirmed, and the surgical effect can be guaranteed.

[0034] Components not described in detail in this article are existing technologies.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lower limb force line measuring device, comprising a fixing component (100), characterized in that, Also includes: The force line rod (600) has two connecting ends, one of which is provided with a first developing ring (500). The first developing ring (500) is connected to the fixing assembly (100) through an adjustment part. The adjustment part is provided with a first moving direction and a second moving direction, which are perpendicular to each other. The second imaging ring (700) is located at the other end of the force line bar (600). The second imaging ring (700) is provided with a clamping claw (800) for constraining the second imaging ring (700) within the projection of the ankle bone in the horizontal plane.

2. The lower limb force line measuring device according to claim 1, characterized in that, The force line rod (600) includes a sleeve (601) and a connecting rod. The first developing ring (500) is disposed at the free end of the sleeve (601). The connecting rod is slidably disposed on the sleeve (601) for reciprocating movement along its opening direction. The second developing ring (700) is disposed at the free end of the connecting rod.

3. The lower limb force line measuring device according to claim 2, characterized in that, The connecting rod includes a first connecting rod (602) and a second connecting rod (603). One end of the second connecting rod (603) is slidably connected inside the sleeve (601), and the other end of the second connecting rod (603) is provided with an internal threaded hole (6011). The end of the first connecting rod (602) away from the second developing ring (700) is provided with an external threaded connecting post (6021), and the external threaded connecting post (6021) is adapted to the internal threaded hole (6011).

4. The lower limb force line measuring device according to claim 1, characterized in that, The first developing ring (500) is fixedly connected to a first limiting plate (501) and a second limiting plate (502) on both sides respectively. The first limiting plate (501) is threaded with a second locking bolt (503), and the force line rod (600) is fixedly connected to the second limiting plate (502).

5. The lower limb force line measuring device according to claim 1, characterized in that, The force line rod (600) extends rigidly along its own axis.

6. The lower limb force line measuring device according to claim 1, characterized in that, The fixing component (100) includes a C-shaped clamp body with an adjusting screw (101) threadedly connected to it. One end of the adjusting screw (101) is provided with a crossbar (102), and the other end of the adjusting screw (101) is provided with a locking element (103) for clamping the side crossbar of the operating table by rotating the adjusting screw (101).

7. A lower limb force line measuring device according to claim 6, characterized in that, An adjusting rod (200) is provided on the C-shaped clamp, and a positioning rod (300) is slidably connected to the adjusting rod (200). A first locking bolt (301) is threadedly connected to the positioning rod (300), and the first locking bolt (301) is adapted to the adjusting rod (200).

8. A lower limb force line measuring device according to claim 6, characterized in that, A cushioning pad is provided on the top of the locking member (103).

9. A lower limb force line measuring device according to claim 1, characterized in that, The clamping claw (800) is provided with a connecting plate (900), the second developing ring (700) is provided with a first connecting hole (701), and the connecting plate (900) is provided with a second connecting hole (901). A rod-shaped member is sequentially inserted into the first connecting hole (701) and the second connecting hole (901) to realize the detachable connection between the connecting plate (900) and the second developing ring (700).

10. A lower limb force line measuring device according to claim 9, characterized in that, The gripper (800) has an anti-slip pad (801) on its claw wall.

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