CN222942423U - Implantable lumbosacral ilium joint fixing screw - Google Patents
Implantable lumbosacral ilium joint fixing screw Download PDFInfo
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- CN222942423U CN222942423U CN202421671299.9U CN202421671299U CN222942423U CN 222942423 U CN222942423 U CN 222942423U CN 202421671299 U CN202421671299 U CN 202421671299U CN 222942423 U CN222942423 U CN 222942423U
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Abstract
本实用新型公开了一种可植入腰骶髂关节固定螺钉，涉及医疗器械技术领域；为了解决现有技术中还没有专门针对恢复患者骨盆后环及腰髂区域稳定性的内固定装置的问题，提出以下技术方案：其包括螺钉本体以及活动连接在螺钉本体上的关节锁紧件，螺钉本体的前端设置第一外螺纹，第一外螺纹的外端部周向开设多个自攻槽，螺钉本体的中间部位开设有贯穿其内部的植骨腔室，关节锁紧件设置在植骨腔室内。关节锁紧件包括底座、支撑杆以及锁紧端，底座连接在植骨腔室的后端，支撑杆对称设置在底座上，锁紧端设置在支撑杆的顶部，且锁紧端向支撑杆的两端扩展。本实用新型创伤小、术中出血小、手术时间短、操作相对简单、术后恢复快、生物力学强度满意。
The utility model discloses an implantable lumbar sacroiliac joint fixation screw, which relates to the technical field of medical devices; in order to solve the problem that there is no internal fixation device specifically for restoring the stability of the patient's posterior pelvic ring and lumbar iliac region in the prior art, the following technical scheme is proposed: it includes a screw body and a joint locking member movably connected to the screw body, a first external thread is arranged at the front end of the screw body, a plurality of self-tapping grooves are circumferentially arranged at the outer end of the first external thread, a bone grafting chamber running through the interior is arranged at the middle part of the screw body, and the joint locking member is arranged in the bone grafting chamber. The joint locking member includes a base, a support rod and a locking end, the base is connected to the rear end of the bone grafting chamber, the support rod is symmetrically arranged on the base, the locking end is arranged at the top of the support rod, and the locking end extends to the two ends of the support rod. The utility model has small trauma, small intraoperative bleeding, short operation time, relatively simple operation, fast postoperative recovery, and satisfactory biomechanical strength.
Description
Technical Field
The utility model relates to the technical field of medical instruments, in particular to an implantable lumbosacral ilium joint fixing screw.
Background
The sacrum and surrounding sacroiliac joint are the more common sites of involvement in bone and soft tissue tumors, with the sacral tumors most common with metastasis and bone giant cell tumors, followed by neurogenic tumors and chordoma. For malignant tumors around the sacroiliac joint, extensive resection or marginal resection is the most important principle for reducing the recurrence rate of diseases, and invasive tumor or metastatic cancer and the like are treated by thorough curettage operation as surgical treatment principles. However, the whole sacroiliac joint is cut off or scraped, the damage of the integrity of the posterior ring of the pelvis is inevitably caused, the weight of the trunk is transmitted when the pelvis bearing bow stands or sits, the stability of the pelvis ring is further affected, serious limb dysfunction and even disability of a patient with sacrum tumor are caused, and the patient with sacrum tumor is involved in various crowds, and relates to children, young and aged patients, so that great mental and economic burden is brought to families and society of the patient with sacrum tumor.
In addition to the sacral tumors, another important disease affecting pelvic stability is pelvic fractures and sacroiliac joint separation caused by high energy violence. More common high energy violent injuries include traffic injuries, earthquake injuries, mine accidents and the like. Pelvic fractures caused by high-energy traffic injuries, particularly the condition of sacroiliac joint separation or pubic symphysis separation, are important factors for killing and disabling pelvic fractures, and pelvic fractures caused by high-energy violence often cause hemorrhagic shock of patients, and unstable pelvic rings form open book or close book-like injuries, so that changes of pelvic volumes are brought, and the death risk of the hemorrhagic shock is aggravated due to changes of pelvic pressure. Earthquake injury is another common important cause of high-energy injury of pelvis, besides traffic injury, and even if a patient is rescued, the life quality of the patient is often affected by limb dysfunction or serious pain caused by instability of sacroiliac joints in future life. However, there is no internal fixation device in the prior art specifically directed to restoring stability to the posterior pelvic girdle and lumbar ilium region of a patient.
Disclosure of utility model
The utility model aims to provide an implantable lumbosacral ilium joint fixing screw, which solves the problem that an internal fixing device for recovering the postoperative stability of a patient's pelvic posterior ring and lumbar ilium region is not specially provided in the prior art.
The technical scheme for solving the technical problems is as follows:
An implantable lumbosacral ilium joint fixing screw comprises a screw body and a joint locking piece movably connected to the screw body, wherein a first external thread is arranged at the front end of the screw body, a plurality of self-tapping grooves are circumferentially formed in the outer end part of the first external thread, a bone grafting cavity penetrating through the screw body is formed in the middle of the screw body, and the joint locking piece is arranged in the bone grafting cavity.
Preferably, the joint locking piece comprises a base, a supporting rod and locking ends, wherein the base is connected to the rear end of the bone grafting cavity, the supporting rod is symmetrically arranged on the base, the locking ends are arranged at the top of the supporting rod, and the locking ends extend to the two ends of the supporting rod.
Preferably, the locking end comprises an arc locking end connected to the top of the supporting rod and a locking tip connected to the top of the arc locking end.
Preferably, the joint locking member is a titanium alloy anchor.
Preferably, the rear end of the screw body is provided with a second external thread.
Preferably, the second external thread is connected with a quincuncial bolt in a threaded manner, so that a doctor can conveniently grip and screw in a surgical operation.
Preferably, the surface of the screw body is provided with a hydroxyapatite layer.
The utility model has the following beneficial effects:
the screw can more firmly penetrate through the sacroiliac joint and enter the sacrum through the first external thread and the self-tapping groove design at the front end, and meanwhile, the locking end design of the joint locking piece ensures the tight combination of the screw, the ilium and the sacrum, and the screw is effectively prevented from loosening and shifting.
The design of the bone grafting chamber allows for filling of autologous bone or allogenic bone material during surgery, which can fuse with surrounding bone tissue, promote bone healing, and increase the success rate of surgery.
The screw implantation method has the advantages of small trauma, less bleeding in operation and short operation time, and can remarkably reduce the occurrence rate of complications such as poor fracture healing, lumbosacral part deformity, unequal length of double lower limbs, nerve function damage and the like.
The operation is simple, the design of the quincuncial bolt enables a doctor to conveniently hold and rotate the screw in the operation process, the operation is simplified, and the operation efficiency is improved.
The screw has high biomechanical strength, is integrally made of titanium alloy materials, ensures the high strength and excellent biocompatibility of the screw, and can meet the complex biomechanical requirements.
The safety is high, the 15-degree inner side convergence angle design of the titanium alloy anchor bolt ensures the safety of the implantation process, and the damage to surrounding tissues caused by the excessive expansion of the anchor bolt is avoided.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic view of the structure of the screw body;
FIG. 3 is a side view of the screw body;
FIG. 4 is a front view of the joint locking member;
FIG. 5 is a front view of a quincuncial bolt;
The reference numerals shown in fig. 1 to 5 are respectively represented by a screw body 1, a first external thread 11, a self-tapping groove 12, a bone grafting chamber 13, a second external thread 14, a joint locker 2, a base 21, a support rod 22, an arc-shaped locking end 23, a locking tip 24, and a quincuncial bolt 3.
Detailed Description
The following description of the embodiments of the present utility model will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present utility model, based on the embodiments of the present utility model.
Referring to fig. 1, the present utility model provides an implantable lumbosacral ilium joint fixing screw, which comprises:
Screw body design As shown in figures 2-3, the screw body 1 is made of high-strength titanium alloy material to ensure biocompatibility and enough mechanical strength. The front end of the screw body 1 is provided with a first external thread 11 for forming a threaded connection with bone tissue during implantation, enhancing the fixation effect. At the outer end of the first external thread 11, three self-tapping grooves 12 are provided circumferentially, which are designed to cut bone tissue during the screwing process, facilitating the smooth passage of the screw through the sacroiliac joint and into the sacrum. The screw body 1 is provided at its middle portion with a bone grafting chamber 13 penetrating the inside thereof for filling autologous bone or allogenic bone material to promote bone healing.
Design of the joint locking member as shown in fig. 4, the joint locking member 2 is made of titanium alloy material, specifically a titanium alloy anchor bolt structure. The locking member includes a base 21, a support bar 22, and a locking end. The base 21 is fixedly connected to the rear end of the bone grafting chamber 13, and the supporting rods 22 are symmetrically arranged on the base 21 and extend upwards. The locking end consists of an arcuate locking end 23 attached to the top of the support bar 22 and a further upwardly extending locking tip 24. The design ensures that after the screw body 1 passes through the sacroiliac joint, the two wings of the locking end can be respectively spread and locked towards the direction of the ilium and the cortical wall of the sacrum, so as to realize the compression fixation of the joint.
The auxiliary structure is that the rear end of the screw body 1 is provided with a second external thread 14 which is in threaded connection with the quincuncial bolt 3. The design of the plum-blossom-shaped bolt is convenient for a doctor to hold and rotate the screw in the operation process, so that the screw can be accurately and quickly implanted into a target position. In addition, the surface of the screw body 1 is coated with a layer of hydroxyapatite to enhance its bioactivity and osseointegration ability.
The screw body 1 is made of medical grade titanium alloy material (such as Ti-6Al-4V ELI), which has good biocompatibility, corrosion resistance and enough mechanical strength, and is suitable for long-term implantation into human body. The first external thread 11 is designed in the form of a full thread with a sufficient depth to ensure a tight connection with bone tissue. The thread form angle, pitch and depth of the thread are precisely calculated to balance the cutting force during screwing and the stability after fixing. In addition, the threaded surface is subjected to a special treatment (such as sand blasting) to increase the bone tissue attachment area. The number, distribution and depth of the self-tapping flutes 12 are optimized to ensure uniform and efficient cutting of bone tissue during the screwing process. The self-tapping grooves also have a certain guiding function and help the screw to smoothly pass through the complex structure of the sacroiliac joint. The size and shape of the bone graft cavity 13 may be adjusted according to the requirements for filling bone material. The inner wall of the chamber is smooth to reduce frictional damage to the filler material. The rear end of the screw body 1 is provided with a second external thread 14 which is in close fit with the quincuncial bolt 3 (fig. 5). To increase rotational stability, the profile angle of the second external thread 14 may be suitably reduced and the pitch increased.
The base 21 is seamlessly connected with the rear end of the bone grafting chamber 13 through precision machining, and stability and reliability of the locking piece in the implantation process are ensured. The base and the cavity can be welded, screwed or buckled. The support rod 22 is designed with a structure that is sufficiently rigid and flexible to withstand bending and torsional forces during implantation. The number, length and cross-sectional shape of the support rods 22 can be adjusted as desired. The arcuate locking end 23 is designed to have an arcuate configuration that matches the shape of the cortical wall of the ilium and sacrum to increase contact area and locking effect. The locking tip 24 is designed to be sharp and of a certain stiffness so as to penetrate the cortical bone and form a stable locking point during implantation. Meanwhile, the locking end surface may be covered with a bioactive coating (e.g., hydroxyapatite) to promote osseointegration.
Surgical procedure:
preoperative preparation, selecting proper screw size and model according to the specific condition of patient. Autologous or allogenic bone material is prepared as a filler. And thoroughly disinfect and anesthetize the surgical field.
The implantation procedure is to first determine the implantation position and angle of the screw using a guide or a positioning needle. Then, the front end of the screw body 1 is aligned with the entry point of the sacroiliac joint and is slowly rotated for implantation. During implantation, the self-tapping channel 12 will cut bone tissue and guide the screw forward. After the screw has passed completely through the sacroiliac joint and into the sacrum, rotation is stopped.
Filling bone graft material autologous bone or allogenic bone material is filled into the cavity through the opening of the bone graft cavity 13. Care should be taken during filling to avoid leakage and clogging of the material.
The joint locker is installed by connecting the base 21 of the joint locker 2 with the rear end of the bone grafting chamber 13. Then, the quincuncial bolt 3 is rotated to push the locking end forward and lock onto the cortical wall of the ilium and sacrum. The force and angle should be controlled during the locking process to avoid damaging surrounding tissue.
And (3) performing postoperative treatment, namely cleaning and suturing the operation area. And carrying out postoperative care and rehabilitation training according to the doctor's advice.
The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421671299.9U CN222942423U (en) | 2024-07-15 | 2024-07-15 | Implantable lumbosacral ilium joint fixing screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421671299.9U CN222942423U (en) | 2024-07-15 | 2024-07-15 | Implantable lumbosacral ilium joint fixing screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222942423U true CN222942423U (en) | 2025-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202421671299.9U Active CN222942423U (en) | 2024-07-15 | 2024-07-15 | Implantable lumbosacral ilium joint fixing screw |
Country Status (1)
| Country | Link |
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| CN (1) | CN222942423U (en) |
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- 2024-07-15 CN CN202421671299.9U patent/CN222942423U/en active Active
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