Load-free adjustable abduction brace for avascular necrosis of femoral head of child

Abstract

The utility model provides a load-free adjustable abduction brace for avascular necrosis of femoral head of children. The load-free adjustable abduction brace comprises a hip ischial tuberosity bearing sleeve, a shank fixing sleeve, a lower limb bearing structure and a lower limb movement control connecting rod, the hip ischial tuberosity bearing sleeve comprises a thigh fixing plate and a thigh contraction fixing belt; the shank fixing sleeve comprises a foot sleeve and a shank sleeve, and the shank sleeve is communicated with the foot sleeve; the lower limb bearing structure comprises a first bearing rod, a second bearing rod, an ischium bearing seat and a thigh connecting rod; the lower end of the first bearing rod is slidably connected with the upper end of the second bearing rod, and a locking structure for preventing sliding is arranged at the sliding joint. The upper end of the first bearing rod is connected with an ischium bearing seat through a ball socket structure; the side wall of the ischium bearing seat is connected with a thigh fixing plate through a thigh connecting rod; the lower part of the second bearing rod is connected with a shank sleeve through a lower limb movement control connecting rod. The device can meet the requirement for zero load of the femoral head of the affected side lower limb of a patient, and normal walking of a child patient is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of medical appliances, in particular to a weight-free and adjustable abduction brace for avascular necrosis of the femoral head in children. Background Art

[0002] For children with early avascular necrosis of the femoral head, weight-free treatment is crucial to avoid the occurrence of early osteoarthritis. At present, most children wear lower limb abduction braces, which not only affects the normal walking of the children, but also fails to meet the requirement of zero weight on the femoral head, which is not conducive to the normal development of the femoral head. In addition, the current hip abduction brace cannot be adjusted in real time according to the accommodation of the femoral head by the acetabulum, thus affecting the treatment effect. Utility Model Content

[0003] In view of the above, it is necessary to provide a weight-free and adjustable abduction brace for avascular necrosis of the femoral head in children, so as to achieve the requirement of zero weight-bearing on the femoral head of the affected lower limb of the patient without affecting the normal walking of the child.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is:

[0005] A weight-free adjustable abduction brace for avascular necrosis of the femoral head in children, comprising a hip ischial tuberosity weight-bearing sleeve, a calf fixation sleeve, a lower limb weight-bearing structure and a lower limb activity control link;

[0006] The hip ischial tuberosity weight-bearing sleeve comprises a thigh fixing plate and a thigh contraction fixing belt, wherein the middle part of the top of the thigh fixing plate has an extension part, and the thigh contraction fixing belt connects the two ends of the thigh fixing plate in the width direction to form a thigh fixing sleeve with adjustable ring size with the thigh fixing plate, and the extension part extends to the oblique upper part of the top sleeve opening of the thigh fixing sleeve;

[0007] The calf fixing sleeve comprises a foot sleeve and a calf sleeve, and the calf sleeve is communicated with the foot sleeve;

[0008] The lower limb load-bearing structure comprises a first load-bearing rod, a second load-bearing rod and a ischium load-bearing seat; the lower end of the first load-bearing rod is rotatably connected to the upper end of the second load-bearing rod, and a locking structure is provided at the rotation connection to prevent rotation, the central axis of the above rotation is perpendicular to the rod length direction of the first load-bearing rod, and points to the side where the ischium tuberosity load-bearing sleeve and the calf fixing sleeve are located; the upper end of the first load-bearing rod is connected to the ischium load-bearing seat through a ball-and-socket structure, and the top of the ischium load-bearing seat is connected to the thigh fixing plate through an extension; the lower part of the second load-bearing rod is connected to the calf sleeve through a lower limb activity control connecting rod;

[0009] The lower limb movable control link includes a first control link, a second control link and a movable rod, one end of the first control link is connected to the second load-bearing rod, one end of the second control link is connected to the calf sleeve, and the other end of the second control link is connected to the movable rod, and the movable rod is movably inserted in the movable groove, and the movable groove is opened on the first control link. The length direction of the movable groove is the direction of the first control link toward the calf sleeve, and the groove width of the movable groove is greater than the rod diameter of the movable rod.

[0010] Preferably, one end of the thigh contraction fixation belt is connected to one end of the thigh fixation plate in the width direction, and the other end of the thigh contraction fixation belt is detachably passed through a connecting ring installed on the other end of the thigh fixation plate in the width direction, and the other end of the thigh contraction fixation belt is detachably connected to the belt body of the thigh contraction fixation belt through Velcro.

[0011] Preferably, thigh protective sleeves are provided at both ends of the thigh fixing plate in the width direction, and the thigh contraction fixing belt is connected to the thigh fixing plate through the thigh protective sleeves; the thigh contraction fixing belt, thigh protective sleeve and thigh fixing plate together constitute a thigh fixing sleeve.

[0012] Preferably, the calf sleeve has a calf adjustment strap for adjusting the size of the sleeve.

[0013] Preferably, both the first load-bearing rod and the second load-bearing rod are telescopic structures.

[0014] Preferably, the lower end of the first load-bearing rod is rotatably connected to the upper end of the second load-bearing rod via a rotating shaft; the locking structure includes a clamping sleeve and a locking piece, the clamping sleeve is movably sleeved at the connection between the first load-bearing rod and the second load-bearing rod, the clamping sleeve is movably sleeved on the first load-bearing rod and the second load-bearing rod at the same time to prevent the first load-bearing rod from rotating relative to the second load-bearing rod, or is slidably sleeved on only one of the first load-bearing rod and the second load-bearing rod; the locking piece is installed on the clamping sleeve, and is used to stably connect the first load-bearing rod and / or the second load-bearing rod when the clamping sleeve is simultaneously sleeved on the first load-bearing rod and the second load-bearing rod.

[0015] Preferably, the clamping sleeves are slidably connected to the first load-bearing rod and the second load-bearing rod; the locking piece is a threaded rod, one end of the threaded rod is located outside the clamping sleeve, and the other end is threaded through the clamping sleeve, and the other end is movably located in the clamping sleeve; locking holes are provided on the rod bodies of the first load-bearing rod and the second load-bearing rod, and the locking holes are opposite to the threaded rod when the clamping sleeve is simultaneously sleeved with the first load-bearing rod and the second load-bearing rod, and can be used for the other end of the threaded rod to be inserted.

[0016] Preferably, the locking member is a threaded structure, and the clamping sleeve is movably connected to the connection between the first load-bearing rod and the second load-bearing rod through the threaded structure.

[0017] Preferably, the first control link and the second control link are both L-shaped rods, and their L-shaped long sides are connected and their short sides are opposite to each other.

[0018] Preferably, the bottom end of the second load-bearing rod has a supporting foot for supporting the ground.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1. The utility model is fixedly connected to the thigh of the patient's affected limb by the ischial tuberosity load-bearing structure of the hip, and is fixedly connected to the calf and foot of the patient's affected limb by the calf fixing sleeve. The lower limb load-bearing structure replaces the epiphysis of the patient's affected limb to contact the patient's pelvis, and replaces the patient's affected foot to support the ground. The lower limb load-bearing structure contacts the ischial tuberosity load-bearing structure of the hip through the extension part, and contacts the calf fixing sleeve through the lower limb activity control connecting rod, so that the patient's affected limb is connected to the lower limb load-bearing structure, and the lower limb load-bearing structure can support the patient's affected limb. In this way, when the patient walks, the lower limb load-bearing structure supports the ground and the pelvis, and the weight of the patient's upper body falls on the lower limb load-bearing structure instead of the patient's affected limb, thus achieving zero load on the femoral head of the patient's affected lower limb.

[0021] 2. The lower limb load-bearing structure of the utility model contacts the patient's pelvis through the ischial load-bearing seat, and the ischial load-bearing seat is connected to the first load-bearing rod through the ball-and-socket structure. In addition, the second load-bearing rod is connected to the calf fixing sleeve through the lower limb activity control connecting rod. This allows the patient's affected limb to rotate at the root of the leg relative to the first load-bearing rod of the lower limb load-bearing structure, and the lower limb can be abducted and internally rotated relative to the second load-bearing rod, so that the patient can walk normally. That is, through the setting of the ball-and-socket structure and the lower limb activity control connecting rod, the use of the utility model will not affect the patient's normal walking, and at the same time can achieve the purpose of zero load on the femoral head of the affected lower limb of the patient. The use effect is good and has certain practicality.

[0022] 3. The utility model enables the first load-bearing rod to rotate relative to the second load-bearing rod through the rotational connection of the first load-bearing rod and the second load-bearing rod in the lower limb load-bearing structure, and the setting of the locking structure. In addition, the setting of the telescopic structure of the first load-bearing rod and the second load-bearing rod enables the locking structure to be at the same level as the patient's knee. In this way, patients using the utility model can flex their legs, which is convenient for patients to perform knee flexion. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model.

[0024] Figure 2 It is a structural schematic diagram of a lower limb activity control connecting rod of the utility model.

[0025] Figure 3 It is a structural schematic diagram of the locking structure of the utility model, in which the locking structure is in a locked state.

[0026] Figure 4 It is a structural schematic diagram of the locking structure of the utility model, in which the locking structure is in an unlocked state.

[0027] Figure 5 This utility model Figure 1 An enlarged view of the mid-angle limit structure.

[0028] Figure 6 yes Figure 5 Schematic diagram on the right side of , in which the second load-bearing rod is in an unbuckled state.

[0029] Figure 7 yes Figure 6 Schematic diagram of the limit state of the second load-bearing rod in the buckling state.

[0030] Figure 8 yes Figure 7 Cross-sectional view of the mid-angle limiting structure.

[0031] Main component symbols

[0032] In the figure: hip ischial tuberosity load-bearing sleeve 1, thigh fixing plate 11, thigh contraction fixing belt 12, thigh protective sleeve 13, extension part, calf fixing sleeve 2, foot sleeve 21, calf sleeve 22, lower limb load-bearing structure 3, first load-bearing rod 31, second load-bearing rod 32, ischial load-bearing seat 33, ball and socket structure 34, supporting foot 35, locking structure 4, clamping sleeve 41, threaded rod 42, locking hole 43, rotating shaft 44, limit block 45, lower limb movable control link 5, first control link 51, second control link 52, movable rod 53, movable groove 54, angle limiting structure 6, first limiting rod 61, second limiting rod 62, strip sliding mouth 63, limiting slider 64 and limiting sleeve 65.

[0033] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0034] See also Figure 1-8 In a preferred embodiment of the utility model, a weight-free adjustable abduction brace for avascular necrosis of the femoral head in children includes a hip ischial tuberosity load-bearing sleeve 1, a calf fixing sleeve 2, a lower limb load-bearing structure 3 and a lower limb activity control connecting rod 5.

[0035] The hip ischial tuberosity weight-bearing sleeve 1 includes a thigh fixing plate 11 and a thigh contraction fixing belt 12. The middle part of the top of the thigh fixing plate 11 has an extension portion 14. The thigh contraction fixing belt 12 connects the two ends of the thigh fixing plate 11 in the width direction to form a thigh fixing sleeve with an adjustable ring size with the thigh fixing plate 11. The extension portion 14 extends to the oblique upper part of the top sleeve opening of the thigh fixing sleeve. The hip ischial tuberosity weight-bearing sleeve 1 is used to be mounted and fixed to the patient's thigh, wherein the thigh contraction fixation belt 12 can be contracted and adjusted to adapt to patients with different leg diameters. In the present embodiment, in order to facilitate the hip ischial tuberosity weight-bearing sleeve 1 to be mounted on the patient's thigh, one end of the thigh contraction fixation belt 12 is connected to one end of the thigh fixation plate 11 in the width direction, and the other end of the thigh contraction fixation belt 12 is detachable and passed through a connecting ring installed on the other end of the thigh fixation plate 11 in the width direction, and the other end of the thigh contraction fixation belt 12 is detachably connected to the belt body of the thigh contraction fixation belt 12 through Velcro. In this way, the hip ischial tuberosity weight-bearing sleeve 1 can be opened by detaching the thigh contraction fixation belt 12 from the connecting ring, and the tightness of the hip ischial tuberosity weight-bearing sleeve 1 can be adjusted by the setting of the Velcro on it, so that the hip ischial tuberosity weight-bearing sleeve 1 can be stably mounted on the thigh on the affected side of the patient. Furthermore, in order to make the thigh fixation sleeve better wrap the patient's thigh, thigh protective sleeves 13 are provided at both ends of the thigh fixation plate 11 in the width direction, and the thigh contraction fixation belt 12 is connected to the thigh fixation plate 11 through the thigh protective sleeve 13; the thigh contraction fixation belt 12, the thigh protective sleeve 13 and the thigh fixation plate 14 together constitute a thigh fixation sleeve; the thigh protective sleeve 13 is a soft plate with a certain hardness, which can be bent and deformed to fit the patient's legs, and at the same time has a certain hardness, so as to support the patient's legs.

[0036] The calf fixing sleeve 2 includes a foot sleeve 21 and a calf sleeve 22, wherein the calf sleeve 22 is connected to the foot sleeve 21, wherein the calf sleeve 22 is used to be sleeved on the calf of the patient's affected side, and the foot sleeve 21 is used to be sleeved on the foot of the patient's affected side. Preferably, in order to facilitate the calf sleeve 22 to be stably sleeved on the calf, so that the calf fixing sleeve 2 is stably sleeved on the foot and calf of the patient's affected side, the calf sleeve 22 of this embodiment has a calf adjustment belt for adjusting the size of the ring, so that the patient's foot and the calf sleeve 22 are conveniently arranged on the calf fixing sleeve 2, and the sleeve diameter can be adjusted according to the leg diameter of the patient's calf, so that the calf sleeve 22 is closely attached to the patient's calf. In addition, in another embodiment of the utility model, in order to facilitate the patient's foot to be sleeved on the foot sleeve 21, the foot sleeve 21 can also be adjusted and fixed by setting an adjustment belt.

[0037] The lower limb load-bearing structure 3 includes a first load-bearing rod 31, a second load-bearing rod 32 and a ischium load-bearing seat 33; the lower end of the first load-bearing rod 31 is rotatably connected to the upper end of the second load-bearing rod 32, and a locking structure 4 is provided at the rotation connection to prevent rotation, and the central axis of the above rotation is perpendicular to the rod length direction of the first load-bearing rod 31, and points to the side where the ischium tuberosity load-bearing sleeve 1 and the calf fixing sleeve 2 are located; the upper end of the first load-bearing rod 31 is connected to the ischium load-bearing seat 33 through a ball and socket structure 34, and the top of the ischium load-bearing seat 33 is connected to the thigh fixing plate 11 through an extension 14; the lower part of the second load-bearing rod 32 is connected to the calf sleeve 22 through a lower limb activity control connecting rod 5. The lower limb load-bearing structure 3 of the utility model is used for external support of the patient's affected side, and it replaces the epiphysis of the patient's affected limb to support the pelvis. Specifically, the lower end of the second load-bearing rod 31 of the lower limb load-bearing structure 3 supports the ground, and the ischial load-bearing seat 33 thereon contacts the pelvis through the extension 14 of the hip ischial tuberosity load-bearing sleeve 1, so that the patient's affected limb not only has the epiphysis in contact with the pelvis, but also has another support point that contacts the pelvis, and the newly added support point replaces the original epiphysis as the support point of the affected side, so that when the patient walks, the patient's affected limb is not subjected to weight, that is, it is not subjected to the weight transmitted from the pelvis to the epiphysis, that is, zero weight is achieved on the femoral head of the patient's affected lower limb. Furthermore, the first load-bearing rod 31 and the second load-bearing rod 32 of the utility model are rotatably connected, and the two can rotate with each other to form a flexed state. When the rotational connection between the two is at the same horizontal height as the knee of the other limb of the patient, the first load-bearing rod 31 and the second load-bearing rod 32 can bend together with the knee of the other limb of the patient to achieve a knee flexion action, which is convenient for the patient to bend his knees and squat. In order to make the utility model suitable for patients with different leg lengths, the first load-bearing rod 31 and the second load-bearing rod 32 of this embodiment are both telescopic structures, so that the length of the first load-bearing rod 31 and the second load-bearing rod 32 can be adjusted by telescopic means, thereby making the position of the rotational connection between the first load-bearing rod 31 and the second load-bearing rod 32 adjustable.

[0038] It should be noted that the utility model uses the setting of the locking structure to enable the first load-bearing rod 31 and the second load-bearing rod 32 to remain in a vertical state when bending is not required, and no relative sliding occurs, which is convenient for walking. When bending is required, it can be achieved after unlocking. In this embodiment, the lower end of the first load-bearing rod 31 is rotatably connected to the upper end of the second load-bearing rod 32 via a rotating shaft 44; the locking structure 4 includes a clamping sleeve 41 and a locking piece, and the clamping sleeve 41 is movably sleeved at the connection between the first load-bearing rod 31 and the second load-bearing rod 32, and the clamping sleeve 41 simultaneously sleeves the first load-bearing rod 31 and the second load-bearing rod 32 in a movable manner to prevent the first load-bearing rod 31 from rotating relative to the second load-bearing rod 32, or only sleeves one of the first load-bearing rod 31 and the second load-bearing rod 32 in a sliding manner to fully expose the rotating connection between the first load-bearing rod 31 and the second load-bearing rod 32 so that the two can rotate relative to each other; the locking piece is installed on the clamping sleeve 41, and is used to ensure that the clamping sleeve 41 is stably connected to the first load-bearing rod 31 and / or the second load-bearing rod 32 when the first load-bearing rod 31 and the second load-bearing rod 32 are simultaneously sleeved to prevent the clamping sleeve 41 from moving. In this embodiment, the clamping sleeve 41 is slidably connected to the first load-bearing rod 31 and the second load-bearing rod 32; the locking member is a threaded rod 42, one end of the threaded rod 42 is located outside the clamping sleeve 41, and the other end is threadedly passed through the clamping sleeve 41, and the other end is movably located in the clamping sleeve 41; the first load-bearing rod 31 and the second load-bearing rod 32 are provided with locking holes 43 on their rods, and the locking holes 43 are connected to the threaded rod 4 when the clamping sleeve 41 is simultaneously sleeved with the first load-bearing rod 31 and the second load-bearing rod 32. 2, and the other end of the threaded rod 42 can be inserted, so that the clamping sleeve 41 can stably connect the first load-bearing rod 31 and the second load-bearing rod 32 by inserting the locking hole 43 through the threaded rod 42, and the clamping sleeve 41 cannot move on the first load-bearing rod 31 and the second load-bearing rod 32. When unlocking is required, the threaded rod 42 can be screwed out of the locking hole 43, and the clamping sleeve 41 can move relative to the first load-bearing rod 31 and the second load-bearing rod 32, thereby exposing the rotational connection between the first load-bearing rod 31 and the second load-bearing rod 32. Further, in order to prevent the clamping sleeve 41 from automatically moving when the rotational connection between the first load-bearing rod 31 and the second load-bearing rod 32 needs to be exposed and interfering with the bending action of the first load-bearing rod 31 and the second load-bearing rod 32, two types of locking holes 43 are set in this embodiment, one of which is for the locking rod 42 to be inserted when the clamping sleeve 41 is simultaneously sleeved on the first load-bearing rod 31 and the second load-bearing rod 32, such as Figure 3 As shown, the other is to allow the locking rod 42 to be inserted when the clamping sleeve 41 exposes the rotation connection between the first load-bearing rod 31 and the second load-bearing rod 32, such as Figure 4In another embodiment of the present invention, the clamping sleeve 41 can also be locked in another way, such as: the locking member is a threaded structure, and the clamping sleeve 41 is movably connected to the connection between the first load-bearing rod 31 and the second load-bearing rod 32 through the threaded structure.

[0039] The lower limb movable control link 5 includes a first control link 51, a second control link 52 and a movable rod 53, one end of the first control link 51 is connected to the second load-bearing rod 32, one end of the second control link 52 is connected to the calf sleeve 22, and the other end of the second control link 52 is connected to the movable rod 53, the movable rod 53 is movably inserted in the movable groove 54, the movable groove 54 is opened on the first control link 51, the length direction of the movable groove 54 is the direction of the first control link 51 toward the calf sleeve 22, and the groove width of the movable groove 54 is greater than the width of the movable rod 53. Rod diameter, that is, the second control link 52 can adjust the distance between the calf sleeve 22 and the second load-bearing rod 32 by sliding the movable rod 53 on the movable groove 54, and the rotation angle of the calf sleeve 22 relative to the second load-bearing rod 32 can be adjusted by rotating the movable rod 53 on the movable groove 54. In other words, the movable rod 53 of the utility model can slide in the movable groove 54 along the length direction of the movable groove 54, and can rotate in the movable groove 54 at the same time, so that the calf sleeve 22 can be abducted and internally rotated relative to the second load-bearing rod 32 by the second control link 52, which is convenient for the patient to walk. Preferably, the first control link 51 and the second control link 52 are both L-shaped rods, and the long sides of the L-shaped rods are connected and the short sides are opposite to each other.

[0040] Furthermore, in order to facilitate the support of the lower limb load-bearing structure 3 on the ground, the bottom end of the second load-bearing rod 32 of the utility model has a supporting foot 35 for supporting the ground.

[0041] In addition, considering that the lower limb load-bearing structure 3 can stably support the ground when the patient is flexed, the present embodiment makes the following arrangements: Figure 5-8, the second load-bearing rod 32 is hinged to the top of the supporting foot 35; the front side of the second load-bearing rod 32 is also provided with an angle limiting structure 6 for controlling the rotation angle of the second load-bearing rod 32 and the supporting foot 35; the angle limiting structure 6 includes a first limiting rod 61, a second limiting rod 62, a limiting slider 64 and a limiting sleeve 65, the first limiting rod 61 is a hollow structure, the lower end of which is spaced apart from the second load-bearing rod 32 and hinged to the top of the supporting foot 35, an external thread structure is provided on the outer wall of the first limiting rod 61, and a strip sliding opening 63 is also opened on the rod wall of the first limiting rod 61 to connect the inside and the outside thereof, and the strip sliding opening 63 is parallel to the first limiting rod 6 1, and its two ends are located between the two ends of the external thread structure, the upper end of the second limit rod 62 is hinged to the second load-bearing rod 32, and the lower end is slidably inserted into the first limit rod 61, and the lower end of the second limit rod 62 is provided with a limit slider 64, the limit slider 64 slides through a strip slide 63, and the end not connected to the second limit rod 62 extends out of the first limit rod 61 through the strip slide 63, the limit sleeve 65 is threadedly sleeved on the outer wall of the first limit rod 61, and is located between the limit slider 64 and the lower end of the first limit rod 61; the above-mentioned hinged rotation axis is parallel to the rotation axis of the second load-bearing rod 32 and the first load-bearing rod.In this embodiment, the second load-bearing rod 32 can rotate relative to the supporting foot 35, so that the second load-bearing rod 32 can form an angle with the supporting bottom surface of the supporting foot 35, which is beneficial for the second load-bearing rod 32 to be bent relative to the first load-bearing rod so that the supporting bottom surface of the supporting foot 35 can be supported on the ground. This is similar to simulating the angle formed by the calf and the sole of the foot when the human lower limb is bent at the knee; and considering that the second load-bearing rod 32 can maintain a certain angle after rotating relative to the supporting foot 35, this embodiment is provided with an angle limiting structure 6, and the angle limiting structure 6 forms a length-adjustable support through the first limiting rod 61 and the second limiting rod 62. The rod-shaped structure can form a stable triangular structure with the second load-bearing rod 32 and the supporting foot 35, so that after being bent to the limit angle, the second load-bearing rod 32 and the supporting foot 35 can maintain the limit angle without rotating downward, which is similar to simulating a relatively stable inclination angle (the angle formed by the calf and the foot) that can be maintained when a human body squats and bends the knees; wherein the maintenance of the limit angle is achieved by the limit sleeve 65 abutting the limit slider 64. Specifically, the support rod-shaped structure composed of the first limit rod 61 and the second limit rod 62 is in the second load-bearing rod 3 When the second load-bearing rod 32 rotates relative to the support foot 35, in addition to adjusting the rod length direction by rotating at both ends, the second load-bearing rod 32 will also be matched with the rotation degree by adjusting the rod length. When the angle between the second load-bearing rod 32 and the support foot 35 is smaller, the lower end of the second limiting rod 62 is closer to the lower end of the first limiting rod 61, and the limiting slider 64 on the second limiting rod 62 also slides toward the limiting sleeve 65. When the limiting slider 64 abuts against the limiting sleeve 65, the second limiting rod 62 can no longer slide toward the lower end of the first limiting rod 61, and the angle limiting structure 6 reaches the length state under the limit state. At this time, the second load-bearing rod 32 is 32 can no longer rotate downward, but the second load-bearing rod 32 can be reset to a vertical state, that is, the second load-bearing rod 32 can rotate between its limit tilt angle and 90 degrees. Therefore, the angle limiting structure 6 of the utility model adjusts the limit tilt angle of the second load-bearing rod 32 through the limiting action of the limiting sleeve 65. When the limiting sleeve 65 is adjusted to different positions, the limit tilt angle of the second load-bearing rod 32 is different. In this way, for different patients, the setting position of the limiting sleeve 65 can be determined according to their stable state when squatting and flexing, so as to meet the flexion requirements of different children and improve the stability of flexion. Further preferably, when the limiting slider 64 is at the upper end of the strip slider, the second load-bearing rod 32 and the supporting foot 35 are perpendicular to each other.

[0042] In summary, the utility model uses the lower limb load-bearing structure 3 to replace the epiphysis of the patient's affected limb to contact the patient's pelvis, and replaces the patient's affected foot to support the ground. The lower limb load-bearing structure 3 contacts the ischial tuberosity load-bearing sleeve 1 of the hip through the extension 14, thereby connecting with the patient's affected thigh, and contacts with the calf fixing sleeve 2 through the lower limb activity control connecting rod 5, thereby connecting with the patient's affected foot and calf, so that the lower limb load-bearing structure 3 can support the patient's affected limb. When the patient walks, the lower limb The load-bearing structure 3 supports the ground and the pelvis, and the weight of the patient's upper body falls on the lower limb load-bearing structure 3 instead of the patient's affected limb, so that the femoral head of the affected lower limb is zero-loaded. Since the ischial load-bearing seat 33 of the lower limb load-bearing structure 3 is connected to the first load-bearing rod 31 through the ball and socket structure 34, and the calf fixing sleeve 2 is connected to the second load-bearing rod 32 through the lower limb activity control connecting rod 5, the patient's affected limb can be rotated, abducted and internally rotated relative to the lower limb load-bearing structure 3, thereby achieving normal walking.

[0043] The above description is a detailed description of the preferred feasible embodiment of the utility model, but the embodiment is not used to limit the scope of the patent application of the utility model. All equivalent changes or modified changes completed under the technical spirit suggested by the utility model should fall within the patent scope covered by the utility model.

Claims

1. A weight-free, adjustable abduction brace for avascular necrosis of the femoral head in children, characterized by: It includes a hip ischial tuberosity weight-bearing sleeve, a calf fixing sleeve, a lower limb weight-bearing structure and a lower limb activity control connecting rod; The hip ischial tuberosity weight-bearing sleeve comprises a thigh fixing plate and a thigh contraction fixing belt, wherein the middle part of the top of the thigh fixing plate has an extension part, and the thigh contraction fixing belt connects the two ends of the thigh fixing plate in the width direction to form a thigh fixing sleeve with adjustable ring size with the thigh fixing plate, and the extension part extends to the oblique upper part of the top sleeve opening of the thigh fixing sleeve; The calf fixing sleeve comprises a foot sleeve and a calf sleeve, and the calf sleeve is communicated with the foot sleeve; The lower limb load-bearing structure comprises a first load-bearing rod, a second load-bearing rod and a ischium load-bearing seat; the lower end of the first load-bearing rod is rotatably connected to the upper end of the second load-bearing rod, and a locking structure is provided at the rotation connection to prevent rotation, the central axis of the above rotation is perpendicular to the rod length direction of the first load-bearing rod, and points to the side where the ischium tuberosity load-bearing sleeve and the calf fixing sleeve are located; the upper end of the first load-bearing rod is connected to the ischium load-bearing seat through a ball-and-socket structure, and the top of the ischium load-bearing seat is connected to the thigh fixing plate through an extension; the lower part of the second load-bearing rod is connected to the calf sleeve through a lower limb activity control connecting rod; The lower limb movable control link includes a first control link, a second control link and a movable rod, one end of the first control link is connected to the second load-bearing rod, one end of the second control link is connected to the calf sleeve, and the other end of the second control link is connected to the movable rod, and the movable rod is movably inserted in the movable groove, and the movable groove is opened on the first control link. The length direction of the movable groove is the direction of the first control link toward the calf sleeve, and the groove width of the movable groove is greater than the rod diameter of the movable rod.

2. The weight-free adjustable abduction brace for avascular necrosis of the femoral head in children as claimed in claim 1, characterized in that: One end of the thigh contraction fixation belt is connected to one end of the thigh fixation plate in the width direction, and the other end of the thigh contraction fixation belt is detachably passed through a connecting ring installed on the other end of the thigh fixation plate in the width direction, and the other end of the thigh contraction fixation belt is detachably connected to the belt body of the thigh contraction fixation belt through Velcro.

3. The weight-free adjustable abduction brace for avascular necrosis of the femoral head in children as claimed in claim 1, characterized in that: Both ends of the thigh fixing plate in the width direction are provided with thigh protective sleeves, and the thigh contraction fixing belt is connected to the thigh fixing plate through the thigh protective sleeves; the thigh contraction fixing belt, the thigh protective sleeve and the thigh fixing plate together constitute a thigh fixing sleeve.

4. The weight-free adjustable abduction brace for avascular necrosis of the femoral head in children as claimed in claim 1, characterized in that: The calf sleeve has a calf adjustment strap for adjusting the size of the sleeve loop.

5. The weight-free adjustable abduction brace for avascular necrosis of the femoral head in children as claimed in claim 1, characterized in that: The first load-bearing rod and the second load-bearing rod are both telescopic structures.

6. The weight-free adjustable abduction brace for avascular necrosis of the femoral head in children as claimed in claim 1, characterized in that: The lower end of the first load-bearing rod is rotatably connected to the upper end of the second load-bearing rod through a rotating shaft; the locking structure includes a clamping sleeve and a locking piece, the clamping sleeve is movably sleeved at the connection between the first load-bearing rod and the second load-bearing rod, the clamping sleeve is movably sleeved on the first load-bearing rod and the second load-bearing rod at the same time to prevent the first load-bearing rod from rotating relative to the second load-bearing rod, or is slidably sleeved on only one of the first load-bearing rod and the second load-bearing rod; the locking piece is installed on the clamping sleeve, and is used to stably connect the first load-bearing rod and / or the second load-bearing rod when the clamping sleeve is simultaneously sleeved on the first load-bearing rod and the second load-bearing rod.

7. The weight-free adjustable abduction brace for avascular necrosis of the femoral head in children as claimed in claim 6, characterized in that: The clamping sleeves are slidably connected to the first load-bearing rod and the second load-bearing rod; the locking piece is a threaded rod, one end of the threaded rod is located outside the clamping sleeve, and the other end is threaded through the clamping sleeve, and the other end is movably located in the clamping sleeve; locking holes are provided on the rod bodies of the first load-bearing rod and the second load-bearing rod, and the locking holes are opposite to the threaded rod when the clamping sleeve is simultaneously sleeved with the first load-bearing rod and the second load-bearing rod, and can be used for the other end of the threaded rod to be inserted.

8. The weight-free adjustable abduction brace for avascular necrosis of the femoral head in children as claimed in claim 6, characterized in that: The locking piece is a threaded structure, and the clamping sleeve is movably connected to the connection between the first load-bearing rod and the second load-bearing rod through the threaded structure.

9. The weight-free adjustable abduction brace for avascular necrosis of the femoral head in children as claimed in claim 1, characterized in that: The first control link and the second control link are both L-shaped rods, and their L-shaped long sides are connected and their short sides are opposite to each other.

10. The weight-free adjustable abduction brace for avascular necrosis of the femoral head in children as claimed in claim 1, characterized in that: The bottom end of the second load-bearing rod has a supporting foot for supporting the ground.

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