CN214549749U

CN214549749U - Individualized matched stack sacrum ilium acetabular prosthesis

Info

Publication number: CN214549749U
Application number: CN202022802795.1U
Authority: CN
Inventors: 康树靖; 王俐慧; 董浩; 许奎雪; 李明洋; 史春宝; 王建超
Original assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Current assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-11-02
Anticipated expiration: 2030-11-27

Abstract

The utility model relates to a personalized assembled sacrum ilium acetabulum prosthesis, which comprises a sacrum part prosthesis, a connecting part, an acetabulum part prosthesis and a machined titanium alloy self-tapping bone nail; flower grooves are processed on matching surfaces connected between the sacrum part prosthesis and the connecting part and between the connecting part and the acetabulum part prosthesis, and a bone trabecula structure with the height of 3mm is arranged at the connecting part of the sacrum part prosthesis and the human bone. The prosthesis is beneficial to the primary stabilization of the prosthesis and the bone growth, 5 bone nails, 2 spinal nail rods and 2 locking screws are adopted to connect the prosthesis and the bone, and the primary stabilization of the prosthesis is enhanced by adopting distributed distribution; the prosthesis can be ensured to be smoothly installed and enter a human body by adopting a personalized customization mode and carrying out the fitting design according to the bone defect part.

Description

Individualized matched stack sacrum ilium acetabular prosthesis

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to individualized matched stack sacrum ilium acetabular bone false body.

Background

The sacrum is an important link for the transition from the spine to the pelvis, and has extremely important functions of supporting the spine, maintaining the stability of the pelvis, transferring physiological loads on the upper part of the body, loading in vitro and the like. The sacral tumor accounts for a certain proportion of cases of spinal tumor, and surgical resection is the main means for treating the sacral tumor at present. After removal of the sacral tumor, various sacral prostheses have been used in the prior art for reconstruction in order to regain the integrity of the sacrum. However, the following drawbacks and disadvantages exist with respect to the sacral prosthesis of the prior art:

firstly, when the sacrum tumor is removed, the range of the tumor removed by different patients is different, the tumor removal range of some patients is large, and the tumor removal range of some patients is small, namely when the tumor of different patients is removed, inclined planes with different inclination angles and shapes and sizes can be formed, the inclined planes are contact surfaces combined with the sacrum prosthesis, the sacrum prosthesis used in the prior art is of an integrated structure, and the corresponding sacrum prosthesis cannot be matched according to the tumor section during use, so that the continuity of the bilateral sacroiliac joints can be influenced, the sacrum prostheses used in the prior art are uniform, individual customization cannot be realized according to the tumor removal surface, and accurate matching cannot be carried out in an operation.

Secondly, after the sacral tumor is removed, the lumbar vertebra is in a suspended state, and the lower lumbar vertebra is directly supported on the ilium by a screw rod system which is a nail passing through the ilium nail in the prior art, namely the church type reconstruction. The structurally reconstructed nail rod is easy to break or loosen, so that the bone is damaged, and a patient is easy to fall into a state of incapability of standing and walking and incapability of self-care in life again. And from the biomechanical point of view, the moment is longer after the lumbar pelvis is fixed, so that the lumbosacral part can bear larger stress and shearing force.

In addition, part of sacral tumor is easy to affect the lower lumbar vertebra, when tumor resection is carried out, the focus on the waist 5 and even the waist 4 needs to be resected as far as possible, while the prosthesis used in the prior art only considers that the resected tumor is limited to the sacrum and the prosthesis needed when the sacrum is on both sides, when the sacral tumor which affects the L5 or L4 segment is resected, the size of the sacral prosthesis is insufficient, and fixed connection cannot be established with the lumbar vertebra.

In view of the foregoing, problems with prior art sacral prostheses include:

1. the sacrum prosthesis in the prior art has the problem of large weight, which is not beneficial to the movement of a human body.

2. The sacrum prosthesis in the prior art has the problem of small application range, and is not beneficial to solving the problem of simultaneous loss of the ilium and acetabulum parts of the sacrum.

3. The sacrum prosthesis in the prior art has the problem that the nail track is too regular, which is not beneficial to the multi-angle suture of the prosthesis and the muscle.

4. The sacrum prosthesis in the prior art has the problem of over-symmetrical structure, and cannot solve the problem caused by unilateral pelvic resection.

5. The sacrum prosthesis in the prior art has the problem that the surfaces of the first ilium combination body and the second ilium combination body are too flat, and the operation difficulty is increased by a knocking insertion mode.

6. The sacrum prosthesis in the prior art has the problem of slow bone expansion, which is not favorable for the primary stability of the prosthesis.

SUMMERY OF THE UTILITY MODEL

The utility model aims at not enough among the prior art, provide a individualized matched stack sacrum ilium acetabular bone false body, the technical problem who solves is stable including how strengthen the initial stage of false body, promotes the bone to grow into, solves the produced problem of pelvis unilateral excision and how to guarantee that the false body is installed smoothly and get into the human body.

In order to achieve the purpose, the utility model adopts the technical proposal that: a personalized assembled sacrum ilium acetabulum prosthesis comprises a sacrum part prosthesis, a connecting part, an acetabulum part prosthesis and a self-tapping bone nail machined by titanium alloy; the connecting part is connected between the sacrum part prosthesis and the acetabulum part prosthesis; the matching surfaces of the sacrum part prosthesis and the connecting part as well as the connecting part and the acetabulum part prosthesis which are connected are provided with flower grooves, and the flower grooves are used for preventing the sacrum part prosthesis and the connecting part as well as the connecting part and the acetabulum part prosthesis from rotating relatively; a bone trabecula structure with the height of 3mm is arranged at the joint of the sacrum part prosthesis and the human bone; the machined titanium alloy self-tapping bone nail comprises a first bone nail, a second bone nail, a third bone nail, a fourth bone nail and a fifth bone nail, wherein one end of the first bone nail, one end of the second bone nail, one end of the third bone nail, one end of the fourth bone nail and one end of the fifth bone nail are screwed into the sacrum connecting prosthesis from different angles respectively, and the other end of the first bone nail, one end of the second bone nail, one end of the third bone nail, one end of the fourth bone nail and one end of the fifth bone nail are screwed into a human body from different angles respectively; the fifth bone screw is screwed into one end of the sacral connecting prosthesis and further penetrates through the second spinal screw rod in a mode of being perpendicular to the central axis of the second spinal screw rod.

Preferably, the trabecular bone structure is a 3D printed titanium alloy prosthetic pore size trabecular bone, the porosity of the trabecular bone structure is 50% to 80%, wherein the pores with pore sizes of 100um to 200um account for 40%, and the pores with pore sizes of 200um to 400um account for 60%.

The outer end of the bone trabecula structure adopts large fillet transition, and the radius of the large fillet is 30mm to 50 mm.

A first compression bolt is arranged in the axial direction of the sacrum part prosthesis, and a second compression bolt is arranged in the axial direction of the acetabulum part prosthesis.

The machined titanium alloy self-tapping bone nail is made of titanium alloy, the major diameter of the machined titanium alloy self-tapping bone nail is 4mm to 6mm, the thread pitch is 1mm to 2mm, and the length of a screw rod is 30mm to 150 mm.

Preferably, the personalized assembling sacrum ilium acetabulum prosthesis further comprises a first spinal screw rod and a second spinal screw rod which are screwed into the human body, wherein the first spinal screw rod is fixed on the sacrum partial prosthesis through a first locking screw; the first locking screw penetrates through the first spinal nail rod in a mode of being perpendicular to the central axis of the first spinal nail rod; the second spinal nail rod is fixed on the sacrum part prosthesis through a second locking screw; the second locking screw penetrates through the second spinal screw rod in a mode of being perpendicular to the central axis of the second spinal screw rod; the individualized assembled sacrum-ilium-acetabulum prosthesis is connected with a human body through the first spinal nail rod, the second spinal nail rod, the first locking screw and the second locking screw; the direction of the fifth bone nail penetrating through the second spinal nail rod is different from the direction of the second locking screw penetrating through the second spinal nail rod.

Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are that:

1. the prior art does not set a trabecular bone part, has the problem of slow bone growth and is not beneficial to the primary stability of the prosthesis. Individualized matched stack sacrum ilium acetabular bone false body utilize 3D printing technique to set up 3 mm's bone trabecula structure with the human bone junction, be favorable to the false body initial stage to stabilize and the bone is grown into.

2. The less and comparatively concentrated law of distributing of prior art bone nail quantity easily leads to the easy dislocation of false body, individualized matched stack sacrum ilium acetabular bone false body adopt 5 bone nails, 2 spinal nail stick, 2 locking screw are connected false body and skeleton, adopt distributed distribution to strengthen the initial stage stability of false body.

3. Prior art sacrum sets up too the symmetry and application scope undersize, can't solve the produced problem of pelvis unilateral excision, individualized matched stack sacrum ilium acetabular bone false body solve sacrum and unilateral pelvis malignant tumor excision replacement problem, use individualized matched stack sacrum ilium acetabular bone false body as supporting replacement excision part, through later stage bone grow into with do not take place the closely laminating of pathological change part bone, let patient later stage can normally move. The sacrum prosthesis, the connection prosthesis and the acetabulum prosthesis play a supporting role, the bone nails, the spinal nail rods and the locking screws play roles in initially stabilizing the prosthesis implantation and preventing the prosthesis from moving, the trabecular bone part is favorable for the initial bone growth and the long-term prosthesis stability and reducing the prosthesis weight through a porous structure, and the flower grooves play a role in preventing the rotation of the prosthesis connection part.

4. Prosthesis among the prior art has first ilium combination body and second ilium combination body surface too level and smooth, need increase the operation degree of difficulty through strikeing the insertion mode, individualized matched stack sacrum ilium acetabular bone prosthesis adopt individualized customization mode, carry out the design of laminating according to the bone defect position, guarantee that the prosthesis installs smoothly and gets into the human body.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments of the present invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention and not to limit the embodiments of the invention.

Fig. 1 is a schematic view of the overall structure of the personalized assembled sacrum ilium acetabulum prosthesis.

Fig. 2 is a schematic structural view of the bone screw, spinal rod and locking screw.

Fig. 3 is a schematic view of the trabecular part and flower grooves.

Fig. 4 is a schematic view of a connection structure of the sacral portion prosthesis.

Fig. 5 is a schematic structural diagram of the personalized binding face design and the compression bolt.

Detailed Description

The present invention is described in more detail below to facilitate an understanding of the invention.

As shown in fig. 1 to 5, the personalized assembled sacrum iliac acetabular prosthesis of the invention comprises a sacrum part prosthesis 1, a connecting part 2, an acetabular part prosthesis 3 and a self-tapping bone nail made of machined titanium alloy; the connecting part 2 is connected between the sacrum part prosthesis 1 and the acetabulum part prosthesis 3; the matching surfaces of the sacrum partial prosthesis 1 and the connecting part 2 and the acetabulum partial prosthesis 3 are provided with flower grooves 5, and the flower grooves 5 are used for preventing the sacrum partial prosthesis 1 and the connecting part 2 and the acetabulum partial prosthesis 3 from rotating relatively; a bone trabecula structure 4 with the height H of 3mm is arranged at the joint of the sacrum part prosthesis 1 and the human bone; the machined titanium alloy self-tapping bone nail comprises a first bone nail 41, a second bone nail 42, a third bone nail 43, a fourth bone nail 44 and a fifth bone nail 45, wherein one end of the first bone nail 41, one end of the second bone nail 42, one end of the third bone nail 43, one end of the fourth bone nail 44 and one end of the fifth bone nail 45 are screwed into the sacrum connecting prosthesis 1 from different angles respectively, and the other end of the first bone nail 41, the second bone nail 42, the third bone nail 43, the fourth bone nail 44 and the fifth bone nail 45 are screwed into a human body from different angles respectively; the fifth bone screw 45 is screwed into one end of the sacral joint prosthesis 1 and further penetrates the second spinal screw rod 52 in a manner perpendicular to the central axis of the second spinal screw rod 52.

Preferably, the trabecular bone structure 4 is a 3D printed titanium alloy prosthetic pore size trabecular bone, the porosity of the trabecular bone structure 4 is 50% to 80%, wherein the pore size is 100um to 200um accounting for 40%, and the pore size is 200um to 400um accounting for 60%.

The outer end W of the bone trabecula structure 4 adopts large fillet transition, and the radius of the large fillet is 30mm to 50 mm. (the outer end is the corresponding outer side of the bone trabecula structure surrounding the prosthesis in a circle)

As shown in fig. 5, a first compression bolt 71 is provided in the axial direction of the sacral portion prosthesis 1, and a second compression bolt 72 is provided in the axial direction of the acetabular portion prosthesis 3.

The first and

second compression bolts

71, 72 are used to compress the sacral portion prosthesis 1 and the acetabular portion prosthesis 3, respectively, onto the connecting portion 2.

Preferably, the personalized assembling sacrum ilium acetabulum prosthesis further comprises a first spinal nail rod 51 and a second spinal nail rod 52 which are screwed into the human body, wherein the first spinal nail rod 51 is fixed on the sacrum partial prosthesis 1 through a first locking screw 61; the first locking screw 61 penetrates through the first spinal nail rod 51 in a manner of being perpendicular to the central axis of the first spinal nail rod 51; the second spinal nail rod 52 is fixed to the sacral portion prosthesis 1 by a second locking screw 62; the second locking screw 62 penetrates through the second spinal rod 52 in a manner of being perpendicular to the central axis of the second spinal rod 52; the first spinal nail rod 51, the second spinal nail rod 52, the first locking screw 61 and the second locking screw 62 are used for connecting the personalized assembled sacrum iliac acetabulum prosthesis with the human body; the direction of the fifth bone screw 45 penetrating through the second spinal screw rod 52 is different from the direction of the second locking screw 62 penetrating through the second spinal screw rod 52.

Further preferably, the joint 8 of the sacral prosthesis 1 and the human bone is designed by adopting a personalized binding surface according to the bone defect part, so as to ensure that the personalized assembled sacral iliac acetabular prosthesis is smoothly installed into the human body.

Individualized matched stack sacrum ilium acetabular bone prosthesis's 3D prints entity partial material and is the titanium alloy, and polishing treatment is done on the surface.

The foregoing description of the preferred embodiments of the invention has been presented for purposes of illustration and description. Modifications and variations of the embodiments disclosed herein may be made by those skilled in the art without departing from the scope and spirit of the invention.

Claims

1. The personalized assembled sacrum ilium acetabulum prosthesis is characterized by comprising a sacrum part prosthesis, a connecting part, an acetabulum part prosthesis and a machined titanium alloy self-tapping bone nail; the connecting part is connected between the sacrum part prosthesis and the acetabulum part prosthesis; the matching surfaces of the sacrum part prosthesis and the connecting part as well as the connecting part and the acetabulum part prosthesis which are connected are provided with flower grooves, and the flower grooves are used for preventing the sacrum part prosthesis and the connecting part as well as the connecting part and the acetabulum part prosthesis from rotating relatively; a bone trabecula structure with the height of 3mm is arranged at the joint of the sacrum part prosthesis and the human bone; the machined titanium alloy self-tapping bone nail comprises a first bone nail, a second bone nail, a third bone nail, a fourth bone nail and a fifth bone nail, wherein one end of the first bone nail, one end of the second bone nail, one end of the third bone nail, one end of the fourth bone nail and one end of the fifth bone nail are screwed into the sacrum connecting prosthesis from different angles respectively, and the other end of the first bone nail, one end of the second bone nail, one end of the third bone nail, one end of the fourth bone nail and one end of the fifth bone nail are screwed into a human body from different angles respectively; the personalized assembled sacrum iliac acetabulum prosthesis further comprises a first spinal nail rod and a second spinal nail rod which are screwed into a human body; the fifth bone screw is screwed into one end of the sacral connecting prosthesis and further penetrates through the second spinal screw rod in a mode of being perpendicular to the central axis of the second spinal screw rod.

2. The personalized assembled sacral iliac acetabular prosthesis of claim 1, wherein the trabecular bone structure is a 3D printed titanium alloy prosthetic pore trabecular bone having a porosity of 50% to 80%, wherein 40% of pores having a pore size of 100um to 200um and 60% of pores having a pore size of 200um to 400 um.

3. The personalized sacral iliac acetabular prosthesis of claim 2, wherein the outer ends of the trabecular bone structures transition with a large fillet having a radius of 30mm to 50 mm.

4. The personalized sacral iliac acetabular prosthesis of claim 2, wherein the sacral portion prosthesis is axially threaded with a first compression bolt and the acetabular portion prosthesis is axially threaded with a second compression bolt.

5. The personalized assembled sacral iliac acetabular prosthesis of claim 1, wherein the machined titanium alloy self-tapping bone screw is made of titanium alloy, and has a major diameter of 4mm to 6mm, a thread pitch of 1mm to 2mm, and a screw length of 30mm to 150 mm.

6. The personalized assembled sacral iliac acetabular prosthesis of claim 1, wherein said first spinal screw rod is secured to the sacral portion prosthesis by a first locking screw; the first locking screw penetrates through the first spinal nail rod in a mode of being perpendicular to the central axis of the first spinal nail rod; the second spinal nail rod is fixed on the sacrum part prosthesis through a second locking screw; the second locking screw penetrates through the second spinal screw rod in a mode of being perpendicular to the central axis of the second spinal screw rod; the individualized assembled sacrum-ilium-acetabulum prosthesis is connected with a human body through the first spinal nail rod, the second spinal nail rod, the first locking screw and the second locking screw; the direction of the fifth bone nail penetrating through the second spinal nail rod is different from the direction of the second locking screw penetrating through the second spinal nail rod.