A combined 3D printed limited navigation template for assisting in triple osteotomy of the hip joint

Abstract

A combined 3D printed limited navigation template for assisting triple osteotomy of the hip joint. Through the design of angled connecting rods and support rods, after each fixed template is placed in the corresponding position, the central acetabular limiting template is located at the ideal position for correcting the acetabular part after osteotomy. During the operation, the osteotomy position is directly confirmed through the steel nail navigation tube on the support rod. After osteotomy, the cut acetabular bone part can be directly rotated or moved to directly fit the central acetabular limiting template, and rotated to the optimal position to achieve concentric reduction of the acetabulum and the femoral head. Then, fixation after osteotomy is directly carried out through the steel nail insertion tube, and the operation is simple and convenient. Through personalized 3D printing technology, the hip joint of the patient is modeled and then the template is made, and the size specifications are more in line with the patient, and the correction effect is better.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices, and particularly relates to a combined 3D printed limit navigation template for assisting hip triple osteotomy. Background Art

[0002] Developmental dislocation of the hip in children is one of the more common congenital lower limb deformities in children, with a high disability rate, seriously affecting the physical and mental health of children. In particular, hip dislocation in older children is more serious. Triple osteotomy is a surgical method in which the ilium, ischium, and pubis around the acetabulum are osteotomized to change the direction of the acetabulum and then change the acetabular containment of the femoral head. This surgery is relatively complex and requires osteotomy of the ilium, ischium, and pubis in three parts and then adjusting the positions separately, with a relatively high operation difficulty.

[0003] In actual surgery, it is impossible to control the direction and degree of rotation of the acetabulum after osteotomy. If the osteotomy position is adjusted too high or too low, or the direction is incorrect, it will affect the rotation of the hip joint, affect the surgical effect, and even cause complications such as femoral head necrosis and joint stiffness.

[0004] Therefore, in the osteotomy operations of the ilium, ischium, and pubis, it is urgent to solve the problems of avoiding traditional empirical treatment, reducing the operation difficulty, shortening the operation time, and improving the treatment effect. Summary of the Invention

[0005] In view of the problems existing in the above background art, the present invention provides a combined 3D printed limit navigation template for assisting hip triple osteotomy, which can rotate the acetabulum to the optimal position after osteotomy, that is, achieve concentric reduction of the acetabulum and the femoral head, and the operation is simple and convenient. Through personalized 3D printing technology, the hip joint of the patient is modeled and then the template is made, and the size specifications are more in line with the patient, and the correction effect is better.

[0006] A combined 3D printed limit navigation template for assisting hip triple osteotomy, the navigation template includes an ilium fixation template, a pubis fixation template, an ischium fixation template, and a central acetabulum limit template. The central acetabulum limit template is respectively connected to the ilium fixation template, the pubis fixation template, and the ischium fixation template through support rods;

[0007] The ilium fixation template includes an ilium fixation part and a first connecting rod. The ilium fixation part is connected to the support rod of the central acetabulum limit template through the first connecting rod; the pubis fixation template includes a pubis fixation part and a second connecting rod. The pubis fixation part is connected to the support rod of the central acetabulum limit template through the second connecting rod; the ischium fixation template includes an ischium fixation part and a third connecting rod. The ischium fixation part is connected to the support rod of the central acetabulum limit template through the third connecting rod;

[0008] The central acetabular limiting template is a circular ring structure, consisting of three detachable parts. The three parts are respectively connected to the ilium fixation template, pubis fixation template, and ischium fixation template through support rods. The inner side of the central acetabular limiting template is a curved surface that conforms to the shape of the bones around the acetabulum.

[0009] The ilium fixation template, pubis fixation template, ischium fixation template, and central acetabular limiting template are all designed and made by 3D printing after modeling the hip joint to be operated on.

[0010] Further, the ilium fixation part includes an osteotomy rotation angle control guide plate and an osteotomy rotation angle verification guide plate, which are connected by a connecting rod. The osteotomy rotation angle control guide plate is based on the outer part of the proximal osteotomy of the iliac wing and the inner part of the distal osteotomy. The osteotomy rotation angle verification guide plate is based on the proximal and distal osteotomy surfaces after rotational dislocation of the osteotomy. The surfaces of the ilium fixation part in contact with the ilium are all irregular shapes that conform to the ilium.

[0011] Further, the osteotomy rotation angle control guide plate is provided with a hollow cylindrical channel with a diameter of 1.5 mm as a Kirschner wire insertion channel.

[0012] Further, the pubis fixation part is a contact part, and its inner surface is an irregular surface that conforms to the shape of the pubis.

[0013] Further, the ischium fixation part is a contact part, and its inner surface is an irregular surface that conforms to the shape of the ischium.

[0014] Further, the connection points of the first connecting rod, second connecting rod, third connecting rod and the support rod are all at a certain angle, so that after the ilium fixation template, pubis fixation template, and ischium fixation template are placed, the central acetabular limiting template is located at the ideal position for correcting the acetabular part after osteotomy.

[0015] Further, steel needle navigation tubes are respectively provided on the support rod, and the positions correspond to the osteotomy positions of the ilium, pubis, and ischium.

[0016] Further, the three detachable parts of the central acetabular limiting template are realized by an embedding method.

[0017] The beneficial effects achieved by the present invention are as follows: Through the design of the connecting rod and the support rod with an angle, after each fixed template is placed in the corresponding position, the central acetabular limiting template is located at the ideal position for correcting the acetabular part after osteotomy. During the surgical operation, the osteotomy position is directly confirmed through the steel nail navigation tube on the support rod. After osteotomy, the bone of the acetabular part cut off can be directly rotated or moved to directly fit the central acetabular limiting template, and rotated to the optimal position to achieve concentric reduction of the acetabulum and the femoral head. Then, fixation after osteotomy is directly carried out through the steel nail insertion tube, and the operation is simple and convenient. Through the personalized 3D printing technology, the hip joint of the patient is modeled and then the template is made, and the size specifications are more in line with the patient, and the correction effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the limiting navigation template described in the embodiment of the present invention.

[0019] Figure 2 It is a schematic side view of the structural diagram of the iliac bone fixation template described in the embodiment of the present invention.

[0020] Figure 3 It is a schematic front view of the structural diagram of the iliac bone fixation template described in the embodiment of the present invention.

[0021] In the figure, 1 - iliac bone fixation template, 2 - pubic bone fixation template, 3 - ischium fixation template, 4 - central acetabular limiting template, 5 - support rod, 11 - iliac bone fixation part, 12 - first connecting rod, 21 - pubic bone fixation part, 22 - second connecting rod, 31 - ischium fixation part, 32 - third connecting rod, 1101 - osteotomy rotation angle control guide plate, 1102 - osteotomy rotation angle verification guide plate, 1103 - connecting rod, 13 - hollow cylindrical channel, 6 - steel needle navigation tube. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings of the specification.

[0023] A combined 3D printing limiting navigation template for assisting hip joint triple osteotomy, the navigation template includes an iliac bone fixation template 1, a pubic bone fixation template 2, an ischium fixation template 3 and a central acetabular limiting template 4, and the central acetabular limiting template 4 is respectively connected to the iliac bone fixation template 1, the pubic bone fixation template 2 and the ischium fixation template 3 through a support rod 5.

[0024] The ilium fixing template 1 includes an ilium fixing part 11 and a first connecting rod 12, and the ilium fixing part 11 is connected to the support rod 5 of the central acetabulum limiting template 4 through the first connecting rod 12; the pubic fixing template 2 includes a pubic fixing part 21 and a second connecting rod 22, and the pubic fixing part 21 is connected to the support rod 5 of the central acetabulum limiting template 4 through the second connecting rod 22; the ischium fixing template 3 includes an ischium fixing part 31 and a third connecting rod 32, and the ischium fixing part 31 is connected to the support rod 5 of the central acetabulum limiting template 4 through the third connecting rod 32.

[0025] The central acetabulum limiting template 4 is a circular ring structure, which consists of three detachable parts. The three parts are respectively connected to the ilium fixing template 1, the pubic fixing template 2 and the ischium fixing template 3 through the support rod 5. The inner surface of the central acetabulum limiting template 4 is a curved surface that fits the shape of the bones around the acetabulum.

[0026] refer to Figure 2-3 In order to more accurately control the rotation angle during the operation, the iliac bone fixing part 11 includes an osteotomy rotation angle control guide plate 1101, an osteotomy rotation angle verification guide plate 1102 and a connecting rod 1103 arranged at the upper ends of the two for connection. The surface of the iliac bone fixing part 11 that contacts the ilium is made into an irregular shape that fits the ilium through 3D printing technology.

[0027] The osteotomy rotation angle control guide 1101 uses the bone of the outer part of the proximal end of the iliac wing osteotomy and the bone of the inner part of the distal end of the osteotomy as a reference to control the degree of rotation after osteotomy correction. The osteotomy rotation angle verification guide 1102 is designed based on the proximal and distal osteotomy surfaces after the proximal and distal ends of the osteotomy are rotated and misaligned. The two guides are used to double verify the accuracy of the rotation angle, and a 1.5mm diameter hollow cylindrical channel 13 is used as the Kirschner wire channel on the osteotomy rotation angle control guide 1101. The computer designs the Kirschner wire channel for fixing the osteotomy block from the iliac wing to the bottom of the acetabulum. After the osteotomy and acetabulum adjustment are completed, the proximal and distal ends after the osteotomy are fixed directly through the steel nail insertion tube 13 with steel nails or screws combined with steel plates to complete the entire operation.

[0028] The pubic fixing portion 21 is a contact portion, and its inner surface is an irregular surface that fits the shape of the pubic bone. The ischium fixing portion 31 is a contact portion, and its inner surface is an irregular surface that fits the shape of the ischium. Figure 1 The specific part of the pubic bone and the ischium to which it fits, as well as the specific shape of the fixing part, can be selected and designed according to the actual patient's condition.

[0029] The connection points of the first connecting rod 12, the second connecting rod 22, the third connecting rod 32 and the supporting rod 5 are all at a certain angle, so that after the ilium fixing template 1, the pubic fixing template 2 and the ischium fixing template 3 are placed, the central acetabular limiting template 4 is located at the ideal correction position of the acetabulum after osteotomy. It should be noted that Figure 1It is only a schematic diagram of the structure. When necessary, each connecting rod and support rod 5 can be bent to a certain extent so that each fixing template can better fit the hip joint bone.

[0030] The support rod 5 is provided with a steel needle navigation tube 6, which is located at the osteotomy position of the ilium, pubis and ischium. During the osteotomy process, each fixed template can be placed at the corresponding position, and the osteotomy position can be located by the steel needle first, and then the osteotomy can be performed after the template is removed, and then the template is replaced, and the acetabulum is corrected by the integrated central acetabulum limiting template 4.

[0031] The three detachable parts of the central acetabulum limiting template 4 are realized by a mosaic manner, or can also be realized by a simple snap-on structure. During the operation of this template, after each fixed template is placed at the corresponding position of the bone, the middle central acetabulum limiting template 4 is directly spliced ​​into one, and then the cut acetabulum part of the bone is adjusted by rotation or movement to make it fit the central acetabulum limiting template, so that the acetabulum is directly corrected to the optimal position.

[0032] The ilium fixation template 1, the pubic fixation template 2, the ischium fixation template 3 and the central acetabulum limiting template 4 are all designed and manufactured by 3D printing after modeling the hip joint to be operated, and the shapes of each surface in contact with the bone are also pointed out by 3D printing to fit the irregular surfaces.

[0033] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A combined 3D printed limit navigation template for assisting triple osteotomy of the hip joint, characterized in that: The navigation template includes an ilium fixation template, a pubis fixation template, an ischium fixation template, and a central acetabulum limit template. The central acetabulum limit template is respectively connected to the ilium fixation template, the pubis fixation template, and the ischium fixation template through support rods; The ilium fixation template includes an ilium fixation part and a first connecting rod. The ilium fixation part is connected to the support rod of the central acetabulum limit template through the first connecting rod; the pubis fixation template includes a pubis fixation part and a second connecting rod. The pubis fixation part is connected to the support rod of the central acetabulum limit template through the second connecting rod; the ischium fixation template includes an ischium fixation part and a third connecting rod. The ischium fixation part is connected to the support rod of the central acetabulum limit template through the third connecting rod; steel needle navigation tubes are respectively arranged on the support rods, and the positions respectively correspond to the osteotomy positions of the ilium, pubis, and ischium; the detachable and spliced three parts of the central acetabulum limit template are realized through a fitting method; The central acetabulum limit template is in a circular ring structure and is composed of three detachable and spliced parts. The three parts are respectively connected to the ilium fixation template, the pubis fixation template, and the ischium fixation template through support rods. The inner surface of the central acetabulum limit template is a curved surface that fits the shape of the bones around the acetabulum; The ilium fixation template, the pubis fixation template, the ischium fixation template, and the central acetabulum limit template are all designed and made by 3D printing after modeling the hip joint to be operated on.

2. The 3D printed limiting navigation template for assisting hip joint triple osteotomy according to claim 1, wherein: The ilium fixation part includes an osteotomy rotation angle control guide plate and an osteotomy rotation angle verification guide plate, which are connected by a connecting rod. The osteotomy rotation angle control guide plate is based on the outer part of the proximal osteotomy of the iliac wing and the inner part of the distal osteotomy. The osteotomy rotation angle verification guide plate is based on the proximal and distal osteotomy surfaces after the proximal and distal osteotomies are rotated and misaligned; the surfaces of the ilium fixation part in contact with the ilium are all irregular shapes that fit the ilium.

3. The 3D printing limit navigation template for assisting hip joint triple osteotomy according to claim 2, characterized in that: A hollow cylindrical channel with a diameter of 1.5 mm is provided on the osteotomy rotation angle control guide plate as a Kirschner wire insertion channel.

4. The 3D printing limit navigation template for assisting in triple osteotomy of the hip joint according to claim 1, characterized in that: The pubis fixation part is a contact part, and its inner surface is an irregular surface that fits the shape of the pubis.

5. A combined 3D printed limiting navigation template for assisting hip triple osteotomy according to claim 1, characterized in that: The ischium fixation part is a contact part, and its inner surface is an irregular surface that fits the shape of the ischium.

6. The 3D printed limited navigation template for assisting in triple osteotomy of the hip joint according to claim 1, characterized in that: The connection parts of the first connecting rod, the second connecting rod, and the third connecting rod with the support rod are all at a certain angle, so that after the ilium fixation template, the pubis fixation template, and the ischium fixation template are placed, the central acetabulum limit template is located at the ideal position for correcting the acetabulum part after osteotomy.

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