Leg frame applied to ectropion stress position X-ray radiography

Abstract

The invention relates to the technical field of medical instruments, and discloses a leg frame applied to eversion stress position X-ray radiography, which comprises a base plate, a thigh support, a shank support, a driving structure, a thigh fixing groove and a shank fixing groove, and is characterized in that the thigh support is fixedly connected to the front end of the base plate, and the driving structure is fixedly connected to the rear end of the base plate; a thigh support is arranged on the driving structure, a thigh fixing groove used for fixing a thigh is formed in the thigh support, the thigh fixing groove is obliquely formed, a shank fixing groove used for fixing a shank is formed in the shank support, and the driving structure drives the shank support to move left and right, so that the shank is turned outwards, and eversion stress is applied to knee joints. Eversion stress applied to different patients can be kept consistent, knee joints of the patients can be bent by 20 degrees more accurately through the obliquely-arranged thigh fixing grooves, medical staff do not need to hold the knee joints in the shooting process, and the medical staff is prevented from being radiated by X rays.

Description

Technical Field

[0001] The invention discloses a leg stand used for valgus stress position X-ray filming, and relates to the technical field of medical equipment. Background Art

[0002] It is reported that 85% of patients with clinical osteoarthritis have isolated medial compartment osteoarthritis in the knee joint, which led to the emergence of the prosthesis design and technology of unicompartmental knee arthroplasty (UKA). UKA is a bone and ligament-preserving surgery that can reliably restore normal knee kinematics and function and is used to treat arthritis limited to the medial or lateral compartment of the knee joint. The earliest application of UKA can be traced back to 1954. Its revolutionary development is attributed to the advent of the Oxford knee designed by Goodfellow and O'Connor's team in 1982. The mobile platform design concept of the Oxford knee has greatly promoted the development of knee prostheses. With the maturity of gasket technology and the more precise prosthesis design in recent years, the survival rate of UKA and TKA has almost no significant difference under the operation of surgeons with certain clinical experience. However, compared with TKA, UKA has many advantages such as less trauma, faster recovery, and more body tissue retention. For patients with unicompartmental osteoarthritis of the knee joint, UKA has become a more important treatment method.

[0003] Since the surgical indication for UKA is patients with unicompartmental osteoarthritis, careful patient selection is very important. How to accurately diagnose whether the patient has unicompartmental osteoarthritis or has developed pancompartmental osteoarthritis before surgery? At present, clinical diagnosis can be made through imaging examinations such as MR and valgus stress X-ray and detailed surgical examination. The pathological changes of patients with medial unicompartmental osteoarthritis are mainly wear of the anterior medial articular cartilage, and there is usually a varus knee deformity, so it can be passively corrected to the neutral position under 20° flexion and valgus stress. The valgus stress film can be used to determine whether the patient's varus deformity can be corrected and to evaluate the integrity of the lateral compartment cartilage. Although MR can be used to observe the degree of articular cartilage damage, MR may overestimate the degree of cartilage damage or ACL defect, so a good valgus stress X-ray film combined with MR is needed for evaluation. The standard valgus stress X-ray requirement is: the knee joint is flexed 20° and valgus stress is applied and the X-ray beam is perpendicular to the knee joint to take the film.

[0004] The defects of this technology so far are: 1. Artificial application of valgus stress leads to inconsistent stress for different patients by different medical staff; 2. Artificial adjustment of the patient's knee flexion by 20° is inaccurate; 3. Clinical medical staff are also exposed to X-ray radiation when performing the operation. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a leg stand for valgus stress position X-ray filming, which can maintain consistent valgus stress applied to different patients. The inclined thigh fixing groove enables the patient's knee joint to flex 20 degrees more accurately. Medical staff does not need to support during filming, thereby preventing medical staff from being exposed to X-ray radiation.

[0006] The object of the present invention is achieved in that:

[0007] A leg stand used for valgus stress position X-ray filming, comprising: a base plate, a thigh support, a calf support, a driving structure, a thigh fixing slot and a calf fixing slot, the front end of the base plate is fixedly connected to the thigh support, the rear end of the base plate is fixedly connected to the driving structure, the driving structure is provided with a calf support, the thigh support is provided with a thigh fixing slot for fixing the thigh, the thigh fixing slot is inclined, and the rear end height of the thigh fixing slot is higher than the front end height, the calf support is provided with a calf fixing slot for fixing the calf, the driving structure is used to drive the calf support to move left and right, and the driving structure can fix the calf support in the moved position.

[0008] Furthermore, the calf fixing groove is inclined, and the rear end height of the calf fixing groove is smaller than the front end height, the angle between the thigh fixing groove and the horizontal direction is angle a, the angle between the calf fixing groove and the horizontal direction is angle b, and the sum of angle a and angle b is 20 degrees.

[0009] Furthermore, the angle between the thigh fixing groove and the horizontal direction is 10 degrees, and the angle between the calf fixing groove 6 and the horizontal direction is 10 degrees.

[0010] Furthermore, the driving structure includes: a slider, a track, a screw and a motor, the lower end of the calf support is fixedly connected to the slider, the slider is slidably set on the track, the slider is threadedly connected to the screw, and the end of the screw is connected to the motor.

[0011] Furthermore, the driving structure is connected to a controller.

[0012] Furthermore, the thigh support is provided with a strap.

[0013] Beneficial effects:

[0014] The present invention discloses a leg stand for X-ray radiography at valgus stress position, comprising: a base plate, a thigh support, a calf support, a driving structure, a thigh fixing slot and a calf fixing slot, wherein the front end of the base plate is fixedly connected to the thigh support, the rear end of the base plate is fixedly connected to the driving structure, the driving structure is provided with the calf support, the thigh support is provided with a thigh fixing slot for fixing the thigh, the thigh fixing slot is inclined, and the rear end height of the thigh fixing slot is higher than the front end height, the calf support is provided with a calf fixing slot for fixing the calf, and the driving structure is used to drive the calf support to move left and right The calf support can be moved, and the driving structure can fix the calf support in the moved position. With this structure, it can be achieved that the base plate is placed under the patient's knee, the thigh support fixes the patient's thigh, and the calf support fixes the patient's calf. The driving structure drives the calf support to move left and right to evert the calf and apply eversion stress to the knee joint. The driving structure is used to accurately control the calf eversion distance, and the eversion stress applied to different patients can be kept consistent. The inclined thigh fixing slot makes it more accurate to flex the patient's knee joint by 20 degrees. Medical staff do not need to support during shooting, thereby avoiding medical staff from being exposed to X-ray radiation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the top view structure of the present invention;

[0016] Figure 2 It is a side view structural schematic diagram of the present invention;

[0017] Figure 3 It is a structural schematic diagram of the driving structure of the present invention;

[0018] Figure 4 This is an X-ray of the patient's knee in normal position;

[0019] Figure 5 X-ray of the patient's knee joint taken with a leg stand Figure 1 ;

[0020] Figure 6 X-ray of the patient's knee joint taken with a leg stand Figure 2 ;

[0021] Figure 7 The object of the present invention Figure 1 ;

[0022] Figure 8 The object of the present invention Figure 2 .

[0023] Among them: 1. base plate; 2. thigh support; 3. calf support; 4. driving structure; 5. thigh fixing slot; 6. calf fixing slot; 7. controller; 8. strap; 4-1. slider; 4-2. track; 4-3. screw rod; 4-4. motor. DETAILED DESCRIPTION

[0024] The specific implementation modes of the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] like Figure 1 As shown, the present embodiment discloses a leg stand for valgus stress position X-ray filming, comprising: a base plate 1, a thigh support 2, a calf support 3, a driving structure 4, a thigh fixing slot 5 and a calf fixing slot 6, the front end of the base plate 1 is fixedly connected with the thigh support 2, the rear end of the base plate 1 is fixedly connected with the driving structure 4, the driving structure 4 is provided with the calf support 3, the thigh support 2 is provided with a thigh fixing slot 5 for fixing the thigh, the thigh fixing slot 5 is inclined, and the rear end height of the thigh fixing slot 5 is higher than the front end height, the calf support 3 is provided with a calf fixing slot 6 for fixing the calf, the driving structure 4 is used to drive the calf support 3 to move left and right, and the driving structure 4 can fix the calf support 3 in the moved position.

[0026] By placing the base plate 1 under the patient's knee, the thigh support 2 fixes the patient's thigh, and the calf support 3 fixes the patient's calf. The driving structure 4 drives the calf support 3 to move left and right to make the calf everted, and apply valgus stress to the knee joint. The driving structure 4 is used to accurately control the calf eversion distance, and the valgus stress applied to different patients can be kept consistent. The inclined thigh fixing slot 5 makes the patient's knee flexion 20 degrees more accurate, and no medical staff needs to support during shooting, thereby preventing medical staff from being exposed to X-ray radiation.

[0027] Specifically, combined Figure 2 As shown, the calf fixing groove 6 is inclined, and the rear end height of the calf fixing groove 6 is smaller than the front end height, the angle between the thigh fixing groove 5 and the horizontal direction is angle a, the angle between the calf fixing groove 6 and the horizontal direction is angle b, and the sum of the degrees of angle a and angle b is 20 degrees.

[0028] The thigh is fixed by the thigh fixing slot 5 so that the angle between the thigh and the horizontal direction is angle a, and the calf is fixed by the calf fixing slot 6 so that the angle between the calf and the horizontal direction is angle b. Since the sum of angle a and angle b is 20 degrees, the patient's knee flexion reaches 20 degrees.

[0029] Specifically, the angle between the thigh fixing groove 5 and the horizontal direction is 10 degrees, and the angle between the calf fixing groove 6 and the horizontal direction is 10 degrees.

[0030] Flexing the thigh and calf 10 degrees makes the patient more comfortable and facilitates imaging from above with an X-ray beam perpendicular to the knee joint.

[0031] Specifically, combined Figure 3As shown, the driving structure 4 includes: a slider 4-1, a track 4-2, a screw rod 4-3 and a motor 4-4. The lower end of the calf support 3 is fixedly connected to the slider 4-1, the slider 4-1 is slidably set on the track 4-2, the slider 4-1 is threadedly connected to the screw rod 4-3, and the end of the screw rod 4-3 is connected to the motor 4-4.

[0032] The motor 4-4 drives the screw rod 4-3 to rotate, causing the slider 4-1 to slide on the track 4-2, thereby driving the calf support 3 to move left and right. The self-locking effect of the slider 4-1 and the screw rod 4-3 fixes the calf support 3 in the moved position. Compared with manually applying eversion stress, it has the advantages of easy control of the force, consistent force for different patients, and constant force during shooting.

[0033] Specifically, the driving structure 4 is connected to the controller 7 .

[0034] The motor is controlled by the controller 7, thereby controlling the left and right movement of the calf support 3, which is easy to operate and convenient for adjusting the magnitude of the valgus stress at any time.

[0035] Specifically, a strap 8 is provided on the thigh support 2 .

[0036] It is convenient to fix the thigh in the thigh fixing groove 5, so that the valgus stress and the flexion angle are more accurate.

[0037] In this embodiment;

[0038] like Figure 4 As shown, X-ray of the patient's knee in the normal position shows that the medial joint compartment is significantly narrowed;

[0039] like Figure 5 As shown, by placing the base plate 1 under the patient's knee, the thigh support 2 fixes the patient's thigh, the calf support 3 fixes the patient's calf, and the driving structure 4 drives the calf support 3 to move left and right, so that the calf is everted, and valgus stress is applied to the knee joint. Under the conditions of valgus and eversion stress, X-ray films show that the inner and outer joint compartments can open, indicating that the patient suffers from unilateral compartment osteoarthritis and UKA surgery is feasible;

[0040] like Figure 6 As shown, for patients with full-compartment osteoarthritis: X-rays in the valgus and valgus stress positions show that the joint compartment spaces cannot be restored to normal spaces, which does not meet the criteria for unicompartment osteoarthritis and UKA surgery cannot be performed.

[0041] like Figure 7 and Figure 8 As shown in FIG. 1 , a leg stand for use in valgus stress position X-ray radiography has been developed in kind, such as Figure 7 and Figure 8 As shown, it should be noted that Figure 7 and Figure 8 Only to prove the authenticity of the present invention, the technical features are Figures 1 to 3 It is already fully documented in the literature and considering the knowledge of those skilled in the art, even if the attached Figure 7 and Figure 8 , nor does it affect the implementation of the present application by those skilled in the art.

[0042] Although specific embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the specific embodiments without departing from the principles and spirit thereof, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A leg stand for valgus stress X-ray filming, characterized in that: include: A base plate (1), a thigh support (2), a calf support (3), a driving structure (4), a thigh fixing groove (5) and a calf fixing groove (6), wherein the front end of the base plate (1) is fixedly connected to the thigh support (2), the rear end of the base plate (1) is fixedly connected to the driving structure (4), the driving structure (4) is provided with the calf support (3), the thigh support (2) is provided with a thigh fixing groove (5) for fixing the thigh, the thigh fixing groove (5) is inclined, and the rear end height of the thigh fixing groove (5) is higher than the front end height, the calf support (3) is provided with a calf fixing groove (6) for fixing the calf, the driving structure (4) is used to drive the calf support (3) to move left and right, and the driving structure (4) can fix the calf support (3) in the moved position.

2. A leg stand for valgus stress X-ray photography according to claim 1, characterized in that: The calf fixing groove (6) is arranged obliquely, and the rear end height of the calf fixing groove (6) is smaller than the front end height, the angle between the thigh fixing groove (5) and the horizontal direction is angle a, the angle between the calf fixing groove (6) and the horizontal direction is angle b, and the sum of angle a and angle b is 20 degrees.

3. A leg stand for valgus stress X-ray photography according to claim 2, characterized in that: The angle between the thigh fixing groove (5) and the horizontal direction is 10 degrees, and the angle between the calf fixing groove (6) and the horizontal direction is 10 degrees.

4. A leg brace for valgus stress position X-ray radiography according to any one of claims 1, 2 or 3, characterized in that: The driving structure (4) comprises: a slider (4-1), a track (4-2), a screw rod (4-3) and a motor (4-4); the lower end of the calf support (3) is fixedly connected to the slider (4-1); the slider (4-1) is slidably arranged on the track (4-2); the slider (4-1) is threadedly connected to the screw rod (4-3); and the end of the screw rod (4-3) is connected to the motor (4-4).

5. A leg stand for valgus stress X-ray photography according to claim 4, characterized in that: The driving structure (4) is connected to the controller (7).

6. A leg stand for valgus stress X-ray photography according to claim 1, characterized in that: The thigh support (2) is provided with a binding belt (8).

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