33results about How to "Notch low" patented technology

The invention provides a design method of a personalized 3D printing calcaneal plate based on topological optimization. The design method comprises the steps that firstly, three-dimensional reconstruction of a calcaneal model is conducted; then, a calcaneal outer side curved surface contour is extracted and constructed, construction of a calcaneal curved surface plate prototype and configuration of screws are conducted, and finite element analysis and topological optimization redesigning of a calcaneal prototype plate are conducted; and finally, 3D printing forming is conducted. According to the design method, based on the personalized treatment principle, limitation of traditional design and manufacturing technologies is broken through, the calcaneal height and reposition flatness of thearticular surface are effectively recovered, anatomic form matching and maximization of the fixation rigidity are achieved through combination of 3D printing and personalized manufacturing, and accordingly, the effect of calcaneal fracture plate internal fixation treatment is improved. According to the calcaneal plate designed through the design method, the problems of personalized anatomical compatibility difficult to achieve in a traditional calcaneus internal fixation plate, insufficient fixation stability and complications of related soft tissue of implantation materials are solved, shaping is easy, incisures are lower, biomechanical stability is better, and the risk of post-operation skin flap necrosis is lower.

The invention relates to a cervical vertebra anterior zero incisura intervertebral fusion device and relates to a cervical vertebra intervertebral disc implantation material. The cervical vertebra anterior zero incisura intervertebral fusion device is characterized in that a slab-shaped fusion cage is arranged, a cut-through fusion chamber is arranged in the middle of the fusion cage, an upper centrum fixing hole inclining upwards and a lower centrum fixing hole inclining downwards are formed in the front end face of the fusion cage, a fastening screw is arranged inside the upper centrum fixing hole and the lower centrum fixing hole respectively, each fastening screw comprises a screw body, a connecting neck and a screw cap, the lower side of each screw cap adopts an arc surface, the upper centrum fixing hole and the lower centrum fixing hole comprises a screw cap embedding hole and a connecting neck hole which are matched with the fastening screws respectively. According to the invention, the cervical vertebra anterior zero incisura intervertebral fusion device is simple in structure and convenient to use; the front end face of the fusion cage is flush with the front side of a cervical vertebra and the incisura is low, which is beneficial to concrescence; the patients feel comfortable and safe and can live a normal life after operations.

The invention discloses a rebuilding locking maxillofacial bone plate comprising a maxillofacial bone plate body. A plurality of locking screw holes are uniformly formed in the maxillofacial bone plate at intervals along the length of the maxillofacial bone plate body; each locking screw hole is reduced from top to bottom gradually and runs through the maxillofacial bone plate body and is provided with an internal thread, and the outer diameter of the internal thread is equal to the maximum diameter of the locking screw hole. An upper groove and a lower groove are respectively formed on the upper surface and the lower surface of the maxillofacial bone plate body between each two optional adjacent locking screw holes and are in up-and-down corresponding distribution; the upper groove runs through the upper surface of the maxillofacial bone plate body between the two optional adjacent locking screw holes, while the lower groove runs through the lower surface of the maxillofacial bone plate body between the two optional adjacent locking screw holes. The rebuilding locking maxillofacial bone plate is convenient to operate and has no deformation of locking screw holes during preoperative forming.

The invention relates to a locking device of an anterior cervical vertebra steel plate, comprising at least one screw and a drop preventing device, wherein the screw is assembled in at least one screw hole arranged in the anterior cervical vertebra steel plate; the position of the anterior cervical vertebra steel plate, which is close to the screw hole, is provided with an assembly groove; and the drop preventing device is arranged in the assembly groove and comprises a first part and a second part which cooperatively move, wherein the first part can push the second part to reciprocate along the assembly groove so that a part of the second part is positioned above the top surface of the screw to prevent the screw from exiting, or move away from the top of the screw so that the screw is conveniently assembled. The locking device has a lower notch on an integral structure and adopts a rotating propelling / exiting mode on operation, thereby not only providing safe and reliable locking for the screw, but also is convenient for operation and reduces the operation difficulty.

The invention relates to a low-profile easily-locked universal pedicle screw for fixation and correction use in posterior spinal instrumentation and belongs to the field of medical instruments. The low-profile easily-locked universal pedicle screw is composed of a screw body and a cap which are split; the top of the screw body is provided with a spherical head and is inserted into the cap; the side of the cap at the spherical head is provided with a U-shaped groove for mounting a connection rod and a lock screw for fixing the connection rod; a side fixing presser is arranged between the connection rod and the spherical head and is fixed to the cap through a clamp spring. The low-profile easily-locked universal pedicle screw has good locking convenience, great activity and good anti-pull strength, enables screw fixation to be less difficult and fixation effect to be enhanced, can prevent screw loosening, and has simplified operating steps, shorter operating time and improved fixing effect, with fewer complications occurred.

The invention discloses a pedicle screw with micro-dynamic function applied in an orthopedic surgery and a neurosurgical surgical instrument. The pedicle screw deeply simplifies the structure of the traditional pedicle screw, eliminates the upper and lower pressure blocks, only uses the screw plug, and simultaneously reduces the notch of the nail seat, the ball stud and the spring, so as to retain the clinical function of the original micro-dynamic pedicle screw, simplify the component, save the cost, reduce the notch of the whole pedicle screw in the clinical application, and has the specialeffect of cushioning and automatic reduction.

The invention relates to a self-locking nut which comprises a nut body and an elastic part, wherein the cross section of the elastic part is a hollow circular shape, the bottom side of the elastic part is fixed on the nut body, and the outer diameter of the bottom side is larger than that of the top; the top is provided with an opening, the size of which is equivalent to the large diameter of a screw hole of the nut body; and one or more rabbet(s) is / are arranged from the opening to the bottom side. The self-locking nut has fewer parts, easy installation and firm locking, so as to shorten the operation time, improve the working efficiency and enhance the fastness of a locking piece.

The invention relates to a split lengthening pedicle screw suitable for operations of a lumbar spinal stenosis patient. The split lengthening pedicle screw is composed of three parts including a screw head end, an internal connecting rod and a screw tail end, and the screw head end and the head side of the internal connecting rod are each provided with internal hexagonal tool screwing grooves; self-tapping threads are arranged on the outer wall of the screw head end and the outer wall of the screw tail end, a thread-free area is arranged in the middle of the internal connecting rod, thread areas are arranged at the two ends of the internal connecting rod, and the thread areas are meshed with threads on the inner walls of the screw head end and the screw tail end; hollow holes are formed in the screw head end, the internal connecting rod and the screw tail end, and corresponding guide needles can pass through the hollow holes. The split lengthening pedicle screw is applied to the operations of the clinic lumbar spinal stenosis patient, after the vertebral pedicle is cut off, the complete split lengthening pedicle screw is arranged in the vertebral pedicle, the internal connecting rod is rotated, while the screw is lengthened, the distance between breaking sections of the vertebral pedicle is driven to be increased, and the aims of lengthening the vertebral pedicle and expanding the cross sectional area of the neural canal and the hole diameter of the foramen intervertebrale are achieved. The split lengthening pedicle screw has the advantages of being simple in structure, convenient to operate, small in wound and the like.

The invention relates to a novel anterior cervical spine fixing plate. The novel anterior cervical spine fixing plate comprises a bone setting plate and screws, wherein a plurality of universal locking holes and bone grafting windows are formed in the bone setting plate; arc-shaped decompressing grooves are formed in the bottom of the bone setting plate; each universal locking hole is a threaded hole formed by multi-piece splicing; each screw can be transplanted and locked deviating from an axis center within the range of 0-15 degrees; and a first thread structure, a second thread structure and a tapping auxiliary structure are arranged on each screw. The novel anterior cervical spine fixing plate disclosed by the invention has the advantages that universal transplanting and locking of thescrews can be performed; the structure is simple, additional screw withdrawing preventing device and screw withdrawing preventing operations are not needed, so that surgery time is saved, and the surgery efficiency is improved; and the incisure is low, so that postoperative complications are reduced, and the surgery prognosis life quality of a patient is improved.

The invention discloses a novel pedicle screw. Traditional fixed-fusion common single-axis and multi-axis screws in the orthopedic surgery operation are technically transformed on the basis of external springs, so that the screws are applied to the non-fusion operation, and the original simple, practical and low-incisure advantages can be maintained.

The invention relates to a preparation method for a 3D printing distal tibial plate. Computer tomography data of bilateral tibiae of the affected side and the healthy side of a target object is collected, the computer tomography data is utilized to establish a reference 3D model of the tibia of the affected side of the target object before fracture, and a tibial solid model is formed by fitting; the tibial solid model formed by fitting is imported into computer-aided design (CAD) to prepare a distal tibial prototype plate, then, finite element analysis and topological optimization are performed on the distal tibial prototype plate for the first time, and a model obtained after finite element analysis and topological optimization is imported into the CAD again to generate an optimized platemodel; finite element analysis and topological optimization are performed on the optimized plate model for the second time, whether a design expected standard is reached or not is judged, and if theexpected standard is reached, 3D printing preparation is performed, otherwise model optimization is performed again; and finally, the tibial plate is further processed. The method solves the problemsthat a traditional tibial internal fixation plate is hard to reach individualized anatomical matching, is insufficient in fixation stability, and the like.

The invention provides an occipital bone plate system. The occipital bone plate system comprises an occipital bone plate, connecting rod assemblies and ball head cups, wherein each connecting rod assembly comprises a first connecting rod; a ball head is arranged at one end of each first connecting rod; each ball head cup has a notch and an accommodating cavity which is arranged in the axial direction of the corresponding ball head cup; each notch is formed in the radial direction of the corresponding ball head cup, and communicates with the corresponding accommodating cavity; each accommodating cavity and the corresponding notch are opened facing the axial end of the corresponding ball head cup; the inner dimension of each accommodating cavity in the radial direction is adapted to the outer diameter of the corresponding ball head; each ball head is detachably arranged in the corresponding accommodating cavity; the width of each notch is not less than the radial outer dimension of the corresponding location of the corresponding first connecting rod; each ball head cup is detachably arranged on the occipital bone plate and can rotate around the axis of the corresponding accommodatingcavity; and each first connecting rod is configured to rotate in the corresponding accommodating cavity through the corresponding ball head, and rotates surrounding the axis of the corresponding accommodating cavity through the corresponding ball head cup. The angle of each first connecting rod relative to the occipital bone plate is adjusted, so that the incisure of the occipital bone plate system can be reduced, the foreign body sensation of a patient after a surgery is reduced, the transplanting is convenient, and the surgery efficiency is improved.

The invention discloses a self-adaptive pedicle screw. A fixing seat internally provided with a spherical through hole is arranged at the top of a screw rod and in slide fit with a spherical hinge which is arranged in the spherical through hole. By means of the spherical hinge structural design, the hole in slide fit is enabled to self adapt to the bending direction of an orthopedic rod so as to offset manufacturing errors of the orthopedic rod, and rod penetration in orthopedics can be easier; further, internal stress generated by elastic deformation of an orthopedic plate due to the fact that the orthopedic rod which is inaccurately manufactured is forcibly pulled into a U-shaped groove of a traditional pedicle screw can be reduced. The self-adaptive pedicle screw has the advantages that incisures at the tail of the screw can be greatly reduced while selection of large-diameter orthopedic rods is completely satisfied; the problem that an existing U-shaped pedicle screw for spinal column orthopedics for infants and children is prone to piercing skin is solved, and the problem that small-diameter orthopedic rods are extremely prone to breakage is solved as well; slide between the nail and the rod is allowed to induce an abnormal spinal column to growth towards the normal direction, limits on growth of the spinal column are avoided, and threats on spinal functions due to surgery prolonging and spinal stretching are avoided.

The invention discloses a component-based thoracolumbar anterior internal fixation system, and relates to the technical field of medical apparatus and instruments. The problem that common implants arehigh in price, and products have the defects that the products are monotonous, the process is rough, and most products adopt stainless steel materials are solved. According to the technical scheme, the system is characterized by comprising mounting pads, fasteners screwed into a vertebral body, a connecting component and locking blocks; mounting grooves are formed in the mounting pads, the two sides of the connecting component are installed in the mounting grooves through matching; a main mounting column is arranged on each mounting pad; the fasteners penetrate through the connecting component and then are in threaded connection with the interiors of the main mounting columns; the locking blocks are in threaded connection with the outer walls of the main mounting columns and abut againstthe side face of the connecting component; the purpose of being easy and convenient to operation in surgery is achieved, notches of an internal fixation device are effectively reduced, the risk that high notch implants affect other organs or tissue on the front edge of the vertebral body is reduced,the overall applicability is high, the application range of the product is greatly increased, and the purpose of having the high economical practicability is achieved.

The invention discloses a self-locking integrated anterior cervical board, and belongs to the technical field of medical apparatuses. The self-locking integrated anterior cervical board comprises an anterior cervical board body, a clasp and a universal screw. The anterior cervical board body is provided with a locking hole, the hole wall of the locking hole is a spherical surface provided with first sawteeth. The clasp has an opening, the outer wall of the clasp is a second spherical surface provided with sawteeth, the clasp is mounted in the locking hole via elastic deformation, and the first spherical surface and the second spherical surface are mutually embedded via the first sawteeth and the second sawteeth. The inner wall of the clasp is provided with a fist thread. The side wall of the head of the universal screw is a conical surface, the side wall of the head is provided with a second thread matching the first thread, the head of the universal screw is screwed into the clasp through cooperation of the first thread and the second thread. The self-locking integrated anterior cervical board is good in integration, the anterior cervical board will not loosen and fall off, the anterior cervical board can be locked twice through retreating a nail. The self-locking integrated anterior cervical board is easy to operate and safe in operation, and by adopting the self-locking integrated anterior cervical board, an operation is short in time, stimulation to esophagus and foreign body sensation can be reduced after the operation.

The invention relates to an ulna olecranon morphological anatomy locking method and a steel plate structure. The ulna olecranon morphological anatomy locking method comprises the following steps: cutting an ulna body and skin corresponding to olecranon; stripping muscle fascia covering the surfaces of the ulna body and the olecranon and exposing a fracture end and a fracture block; cleaning bloodclots at the fracture end, resetting the fracture block and temporarily fixing the fracture block; observing the reduction condition of the fracture block, placing a locking steel plate II at rear ends of the ulna body and the olecranon, and placing a locking steel plate I at front ends of the ulna body and the olecranon; washing the wound, and confirming the reduction and fixation conditions of the fracture block again; suturing the wound after reduction and fixation of the fracture block meet the requirements. By means of the method, the fracture block can be well fixed, and the arrangementdirection of locking nails and / or leather nails does not point to the concave joint surface and do not enter the joint, so that good safety is achieved.

The invention relates to the field of orthopedic surgery medical instruments, in particular to an embedded anterior cervical compression fusion fixing device. The device comprises fixing screws and avertebral bone plate; the vertebral bone plate is provided with at least one convex angle at two axial ends which are consistent with the axial direction of the vertebral column, and the back surfaceof the convex angle of the vertebral bone plate is provided with a convex structure which can be embedded into the vertebral body; the convex angle is provided with a round-like screw hole, and the inner surface of the screw hole is provided with an internal thread; the curvature of the top end of the round-like screw hole is larger than that of the low end of the round-like screw hole; one end, opposite to the cervical vertebra skeleton, of the screw hole is provided with a screw hole inclined plane which inclines inwards; and the fixing screws fix the vertebral bone plate on the cervical vertebra skeleton through the screw holes. The device can reduce vertebral bone plate incisura, realize intervertebral compression, increase the stability of the vertebral bone plate and effectively improve the intervertebral fusion rate.

The patent discloses a thoracolumbar spine anterior system. The thoracolumbar spine anterior system is characterized by including a screw-rod system. The screw-rod system comprises screws, screw caps,retainer ring and rods, wherein, the screw caps and the retainer ring are fixedly connected by a one-step locking manner. The surgical operation can be simplified in anterior surgery of the thoracolumbar vertebral body by using the above technical solution.

The invention relates to a cervical vertebra anterior C2.3 eccentric placement nail plate fixing system, and comprises a fixing plate which is in the shape of 'L' and the inner side edge of the fixingplate is thinner than the outer side edge of the fixing plate. The fixing plate is provided with a first group of nail holes and a second group of nail holes; the first group of nail holes is composed of three circular holes, and the three holes are longitudinally arranged along the longitudinal direction in the shape of the ''L''; the second group of nail holes are arranged in the shape of a triangle, and the inner side edge transition part is in an inclined arc shape. The first group of nail holes are inclined holes, and the axis of the first group of nail holes is inclined towards the direction of the inner side edge of the top end of the fixed plate; and the second group of nail holes are inclined holes, and the axes are inclined towards the inner side edge direction.

The invention belongs to the technical field of medical instruments, and particularly discloses a thoracolumbar spine side adjustable fixing plate system. The system comprises a locking plate, a sliding plate, a vertebral screw and a locking screw, and the locking plate and the sliding plate are both arc plates; a fixing hole is formed at the inner end of the locking plate, and a screw hole for implanting the vertebral screw is formed at the outer end of the locking plate; a strip-shaped hole is formed at the inner end of the sliding plate, and a screw hole is formed at the outer end; and thelocking plate and the sliding plate are connected through the locking screw, and the vertebral screw is implanted in the position, close to an end plate, of the vertebral body of the patient through the screw hole. Due to the fact that the length is adjustable, it can be guaranteed that the vertebral screw is selectively implanted into the bone close to the end plate, the end plate is prevented from being damaged, the screw holding force is high, and the screw is suitable for normal or osteoporosis patients to reconstruct thoracolumbar stability; and the transverse radian of the locking plateand the transverse radian of the sliding plate correspond to the radian of the side wall of the vertebral body, the locking plate and the sliding plate can be better attached to the curved surface onthe side of the vertebral body, meanwhile, an intervertebral implant or a bone grafting material is wrapped, and the effect of preventing displacement and disengagement is achieved.

The invention relates to a rope type internal fixation device for the orthopedics department. The rope type internal fixation device comprises a rope and fixation nails, wherein the rope is formed by weaving fibers and provided with a fixation band. The two ends of the fixation band are respectively provided with a fixation ring. The fixation nails are inserted into the fixation rings. The fixation nails are hollow and provided with hollow axial channels. The end face area of the ends, connected with nail bodies, of nail heads is larger than the end face area of the ends, connected with the nail heads, of the nail bodies. The rope type internal fixation device is a novel growth guiding internal fixation device, has flexibility compared with a steel plate, can be suitable for the metaphysis in any anatomical shape, has lower incisurae and higher biomechanical strength and makes placement of the screws more convenient, and therefore the problems that for a current steel plate shaped like the Arabic number eight, screws are often pulled out and fractured and are complicated to place in and take out are effectively solved.

The invention discloses an intervertebral fusion device, which comprises a fusion device body used for keeping distance between adjacent centrums, wherein the fusion device body comprises a cross beam and a vertical beam fixedly connected with the cross beam, when the fusion device body is arranged between the adjacent centrums, a space for accommodating bone graft is formed by the cross beam and soft tissues on two sides of the cross beam. The intervertebral fusion device also comprises a fixed connecting block connected with the tail part of the fusion device body in a sleeved manner and used for connecting the adjacent centrums. According to the intervertebral fusion device provided by the invention, a closed structure of the intervertebral fusion device in the prior art is changed into an opened structure, the intervertebral fusion device is allowed to be implanted into an intervertebral space and the bone graft is filled in the intervertebral space, an enough distribution space of the bone graft in the intervertebral space is ensured, centrum terminal plates on two ends of the intervertebral space can be tightly contacted and the speed and the quality of intervertebral fusion are increased. The invention also provides a propeller for pushing the intervertebral fusion device into the intervertebral space.

The invention relates to a self-locking fixed part for a surgical implant. The self-locking fixed part comprises a steel plate and a self-locking screw, wherein the self-locking screw consists of a screw rod and a screw cap, a ring-shaped groove with the end surface being similar to the V shape is arranged on the screw cap longitudinally, the screw cap is divided into an outer ring and an inner ring by the ring-shaped groove, more than two openings are arranged on the outer ring of the screw cap longitudinally, and the part with the maximum outer diameter of the screw cap is lower than the upper end surface of the screw cap; a screw hole matched with the shape of the screw cap is arranged on the steel plate, the inner diameter of an inlet of the screw hole is less than the maximum outer diameter of the of the screw cap, the maximum inner diameter of the screw hole is larger than the inner diameter of the inlet of the screw hole and less than the maximum outer diameter of the screw cap, and the inlet of the screw hole and an arc of the part with the maximum inner diameter are connected to form a laminated arc; and the self-locking screw penetrates through the screw hole arranged on the steel plate and is implanted into the steel plate for compressing and fixing the steel plate, and therefore, the part with the maximum outer diameter of the outer ring of the screw cap pushes against the laminated arc of the screw hole in a clamping way, so as to realize self locking. The self-locking fixed part has the advantages that the structure is simple, the cost is low, the processing and the production are easy, the implantation is convenient, the operation is fast, the incisura is small, and the surgery time is saved.

The invention discloses a rebuilding locking maxillofacial bone plate comprising a maxillofacial bone plate body. A plurality of locking screw holes are uniformly formed in the maxillofacial bone plate at intervals along the length of the maxillofacial bone plate body; each locking screw hole is reduced from top to bottom gradually and runs through the maxillofacial bone plate body and is provided with an internal thread, and the outer diameter of the internal thread is equal to the maximum diameter of the locking screw hole. An upper groove and a lower groove are respectively formed on the upper surface and the lower surface of the maxillofacial bone plate body between each two optional adjacent locking screw holes and are in up-and-down corresponding distribution; the upper groove runs through the upper surface of the maxillofacial bone plate body between the two optional adjacent locking screw holes, while the lower groove runs through the lower surface of the maxillofacial bone plate body between the two optional adjacent locking screw holes. The rebuilding locking maxillofacial bone plate is convenient to operate and has no deformation of locking screw holes during preoperative forming.

An anterior cervical zero-profile intervertebral fusion device relates to a cervical intervertebral disc implant. There is a thick-plate-shaped fusion cage, and a fusion cavity is provided in the middle of the fusion cage. It is characterized in that the front face of the fusion cage is provided with an upwardly inclined upper vertebral body fixing hole and a downwardly inclined lower vertebral body fixing hole. The upper vertebral body There are fastening screws in the fixing hole and the lower vertebral body fixing hole respectively. The fastening screw includes three parts: the nail body, the connecting neck and the nail cap. The lower side of the nail cap is arc-shaped; The holes all include a nail cap embedding hole matched with a fastening screw and a connecting neck hole. The invention is simple in structure and easy to use. The front end of the fusion device is substantially flush with the front side of the cervical vertebrae and has a low notch, which is beneficial to surgical healing. The neck of the patient is comfortable and safe after the operation, and normal life will not be affected.

The invention relates to a self-locking fixed part for a surgical implant. The self-locking fixed part comprises a steel plate and a self-locking screw, wherein the self-locking screw consists of a screw rod and a screw cap, a ring-shaped groove with the end surface being similar to the V shape is arranged on the screw cap longitudinally, the screw cap is divided into an outer ring and an inner ring by the ring-shaped groove, more than two openings are arranged on the outer ring of the screw cap longitudinally, and the part with the maximum outer diameter of the screw cap is lower than the upper end surface of the screw cap; a screw hole matched with the shape of the screw cap is arranged on the steel plate, the inner diameter of an inlet of the screw hole is less than the maximum outer diameter of the of the screw cap, the maximum inner diameter of the screw hole is larger than the inner diameter of the inlet of the screw hole and less than the maximum outer diameter of the screw cap, and the inlet of the screw hole and an arc of the part with the maximum inner diameter are connected to form a laminated arc; and the self-locking screw penetrates through the screw hole arranged on the steel plate and is implanted into the steel plate for compressing and fixing the steel plate, and therefore, the part with the maximum outer diameter of the outer ring of the screw cap pushes against the laminated arc of the screw hole in a clamping way, so as to realize self locking. The self-locking fixed part has the advantages that the structure is simple, the cost is low, the processing and the production are easy, the implantation is convenient, the operation is fast, the incisura is small, and the surgery time is saved.

The present invention relates to a self-locking nut which comprises a nut body and an elastic part, wherein the cross section of the elastic part is a hollow circular shape, the bottom side of the elastic part is fixed on the nut body, and the outer diameter of the bottom side is larger than that of the top; the top is provided with an opening, the size of which is equivalent to the large diameter of a screw hole of the nut body; and one or more rabbet(s) is / are arranged from the opening to the bottom side; the joint part of the bottom side of elastic part and the nut body is arc-shaped. The self-locking nut has fewer parts, easy installation and firm locking, so as to shorten the operation time, improve the working efficiency and enhance the fastness of a locking piece.

A locking device for an anterior cervical steel plate (1) includes at least one screw (2) and an anti-release device, with the screw (2) assembled in at least one screw hole (11) disposed on the steel plate (1). The anti-release device is installed in an assembly recess (12) disposed at the location close to the screw hole (11) on the steel plate (1), and includes a first component(4) and a second component (3) capable of coordinated movement. The first component(4) can push the second component (3) to move reciprocatingly along the assembly recess (12), so as to locate a part of the second component (3) on the upper surface of the screw (2) to prevent the screw (2) from releasing, or to move the part of the second component (3) away from the upper surface of the screw (2) to facilitate assembling the screw (2).

The invention relates to a pedicle screw seat cross-connecting device, which comprises a first nail base, a second nail base, a first connecting rod, a second connecting rod, a first locking plug and a second locking plug, a first connecting rod radially passes through the first nail base, and the first locking plug is screwed into the first nail base and abuts the first connecting rod, and a second connecting rod radially passes through the second nail base, the second locking plug is screwed into the second nail base and abuts the second connecting rod, the innovation is that the pedicle screw seat cross-connecting device also comprises a first horizontal connecting rod and a second horizontal connecting rod, one end of the first horizontal connecting rod is arranged at the first nail base and located between the first connecting rod and the first locking plug, and one end of the second horizontal connecting rod is disposed on the second nail base and located between the second connecting rod and the second locking plug; and the other end of the first horizontal connecting rod is connected with the other end of the second horizontal connecting rod through a connecting mechanism. The pedicle screw seat cross-connecting device not only reduces the surgical notch, but also improves the safety of the operation.

The invention relates to the technical field of medical instruments, and particularly relates to a patella fixer. The patella fixer comprises a socket member and a plug member; the socket member comprises a socket base, fixing claws and slots, wherein the fixing claws and the slots are fixedly arranged at the two ends of the socket base; socket lock buckles are arranged on two inner sidewalls of the socket base; the plug member comprises a plug base, the fixing claws and plug lock buckles, wherein the fixing claws are fixedly arranged at the two ends of the plug base, and the plug lock buckles are arranged on outer sidewalls of elastic legs; the patella fixer also comprises a strutting mechanism which is convenient for the socket lock buckles and the plug lock buckle to be meshed with each other. The patella fixer provided by the invention is provided with the socket member and the plug member which can be buckled together, and the distance between the socket member and the plug member can be conveniently regulated by insertion and fixation of the socket member and the plug member, so the patella fixer can meet the needs of various different patients, and the fixation effect of the patella fixer on patella is farthest enhanced.