57 results about "Medullary cavity" patented technology

The invention relates to a tibial plateau prosthesis. The tibial plateau prosthesis mainly comprises a tibial spacer, a tibial plateau and a sleeve. The tibia gasket is provided with a first fixing block and three arc-shaped holes, and movable second fixing blocks are arranged in the holes. The tibial plateau comprises a plateau support with open holes and a shell, and the open holes are formed in the side portion and the bottom of the shell. The screw penetrates through the gasket and the platform support to be inserted into the shell, and outer threads of the screw are meshed with inner threads of the sleeve. The sleeve moves upwards and extends out of the side hole of the shell through a hinged connecting rod system to penetrate into the medullary cavity to enhance fixation. A spring is arranged in the screw to drive the first pushing part and can be matched with the sleeve to prevent downward movement; and meanwhile, the second pushing part in the screw can extend into the medullary cavity from the bottom through threads. The design realizes multidirectional fixation and improves the stability of the prosthesis.

The invention discloses a three-section thighbone retrograde intramedullary nail, relates to the field of medical instruments, and provides a detachable and assembled three-section thighbone retrograde intramedullary nail aiming at the problems that an existing thighbone medial condyle retrograde intramedullary nail is poor in adaptability and insufficient in fixing strength. A main nail body of the intramedullary nail is composed of a head section, a middle section and a tail section, original spiral nested structures are adopted at the joints of the sections, and the three sections are tightly connected to form the complete and high-strength intramedullary nail by matching with the hollow interior design and penetrating a titanium cable into a medullary cavity for tightening and automatically rotating and matching the head section and the middle section of the main nail body. And medullary cavity structures and fracture types of different patients can be accurately matched. Compared with a traditional intramedullary nail, the intramedullary nail has the advantages that mounting convenience and structural stability are remarkably improved, intraoperative adjustment time can be shortened, the risk of injury to a medullary cavity of a patient is reduced, and an innovative solution is provided for personalized treatment of distal femur fractures.

The invention provides a femoral stem prosthesis. The femoral stem prosthesis comprises a femoral stem, an expansion component and a sleeve. The femoral stem is composed of an upper stem body and a replaceable lower stem body, and threads are arranged in the femoral stem. The expansion part is located in the upper handle body and comprises a screw, a rotating disc and a multi-layer pushing structure. The screws are connected with the upper and lower handle bodies through threads; and the turntable is in threaded engagement with the screw and can drive the first pushing part along the first guide rail during rotation. Ratchets are arranged in the rail component and meshed with the pawls of the second pushing part, and an open hole is formed in the side of the second pushing part. And the sleeve is linked with the expansion component through the fifth pushing part, the fourth pushing part and the third pushing part. During implantation, the second pushing part outwards pushes the sleeve to be attached to the wall of the medullary cavity, the internal pushing structure acts successively under the counter-acting force, and finally the first pushing part is separated from the second pushing part. Then bone cement is injected through a sleeve micropore, and the stability of the prosthesis is enhanced. By means of the design, intraoperative adaptation and stable filling are achieved.

The application provides a controllable self-expanding intramedullary nail internal fixation system for long bone fracture, belonging to the technical field of orthopedic medical instruments, and comprising a self-expanding intramedullary nail, a visible controllable self-expanding platform and a locking nail; the self-expanding intramedullary nail comprises a locking hole and an expandable support; the locking hole is arranged at the proximal end of the self-expanding intramedullary nail and is matched with the locking nail to fix the proximal end of the self-expanding intramedullary nail; the expandable support is arranged at the distal end of the self-expanding intramedullary nail after expansion to fix the distal end of the self-expanding intramedullary nail. The visible controllable self-expanding platform is in communication with the expandable support and can display the expansion size, and the self-expanding intramedullary nail can be prevented from being expanded too large to affect the medullary cavity by precalculating the expansion size.

The application provides a femoral stem prosthesis and a hip joint prosthesis with the same, wherein the femoral stem prosthesis comprises: a mounting block comprising a first block body and a second block body, the second block body being arranged on the side of the first block body, and the first block body and the second block body being capable of relative movement; a guide structure arranged between the first block body and the second block body, the guide structure extending along the axial direction of the first block body; a locking assembly arranged between the first block body and the second block body to fix the first block body and the second block body; a support column swingably arranged on the second block body, and an acetabular component arranged on the support column; and a fixing mechanism arranged below the first block body and capable of being inserted into the medullary cavity. The technical scheme of the application effectively solves the problem that the relative position of the neck stem of the femoral stem and the stem body cannot be adjusted in the related art.

Bone harvesting system including methods and devices for obtaining and / or removing osseous debris from a bone using an auger having a flexible, helical fin projecting from a shaft. In an exemplary method, a leading end region of the auger is placed into a reamed portion of a bone's medullary cavity via an entry site extending into the bone. Osseous debris is driven toward the entry site with the auger. At least a portion of the osseous debris that has passed through the entry site is collected outside the bone. In some embodiments, the leading end region of the auger is deformed by contact between the helical fin and a wall of the medullary cavity, to conform the helical fin in the leading end region to a portion of the medullary cavity.

Provided herein are methods and systems for stabilizing a joint, such as the elbow. The system may include an intramedullary rod configured to be placed in a medullary canal of a bone, a pin, a linking member defining an aperture for receiving the pin, and a connector defining a first aperture and a second aperture, the first aperture configured to receive the linking member. The system may further include a screw extending through the second aperture of the connector and the aperture of the intramedullary rod. The system may be configured to be implanted into a patient.

The application discloses a guiding locking device and a fracture fixation system thereof, and relates to the technical field of medical devices. The guiding locking device comprises a guiding locking pipe and a locking piece, at least one strip-shaped slot is arranged on the pipe wall of the guiding locking pipe and communicates with the pipe cavity of the guiding locking pipe, the strip-shaped slot penetrates through the locking end, and the locking piece can drive the pipe wall of the locking end to contract. The fracture fixation system comprises a bone plate, a bone needle and the guiding locking device, a fixing through hole is arranged on the bone plate, the connecting end of the guiding locking pipe is fixedly connected with the fixing through hole, the guiding locking pipe is arranged perpendicularly to the bone plate, the bone needle is arranged in the pipe cavity of the guiding locking pipe, and the locking piece can drive the pipe wall of the locking end to contract and clamp the bone needle. The application reduces the risk of fracture displacement when the bone needle is used to fix the fracture; avoids the influence of the bone needle on the placement of the bone plate; shortens the length of the bone needle entering the medullary cavity, so that the application scene of the temporary fracture fixation technology of the bone needle is not limited in the treatment of the fracture by the intramedullary nail; and the stability is better than that of the multiple bone needles used to fix the fracture.

The application relates to a medical orthopedic quick drill bit, which comprises a drill bit body composed of a drill bit part and a drill rod part, wherein the drill bit part is provided with circularly arranged cutting edges for bone positioning and hole forming, and the drill rod part is designed as a light rod; a connecting piece is connected with the drill bit body at one end and fixed with a driving piece at the other end, and the two are quickly separated through a split device containing a clamping piece and a disengaging piece, so that safe disconnection is ensured when the pressure of the medullary cavity or cancellous bone is abnormal. The application has the technical effects of improving the operation efficiency, enhancing the safety and reducing accidental injuries.

The utility model discloses a metal 3D printing porous bone induction structure tibial prosthesis, which comprises a diaphysis prosthesis, a bone fracture plate and an intramedullary nail, the diaphysis prosthesis is designed according to the anatomical form of the focus part of a patient, the diaphysis prosthesis comprises a solid framework and a porous structure, and a cavity is arranged in the diaphysis prosthesis; the at least two bone fracture plates are connected to the two ends of the diaphysis prosthesis in the tibia direction respectively, and the at least two bone fracture plates are connected with the tibia near end and the tibia far end through screws respectively. The tibia near end comprises a first medullary cavity, the tibia far end comprises a second medullary cavity, the intramedullary nail penetrates through the first medullary cavity, the cavity and the second medullary cavity, and the two ends of the intramedullary nail are connected with the tibia near end and the tibia far end through screws respectively. The utility model can solve the problems of incapability of realizing rapid healing, poor initial stability and poor long-term stability in the existing bone defect reconstruction.

The utility model provides a hemostasis device for a femoral medullary cavity. The hemostasis device comprises a guider, a first bag body, a second bag body, an overflow hole, a first injection port, a second injection port and a sealing piece. A first bag body is wrapped outside the guider, a pressurizing bag cavity is arranged between the guider and the first bag body, a second bag body is wrapped outside the first bag body, a liquid storage bag cavity is arranged between the first bag body and the second bag body, and a group of liquid overflow holes communicated with the liquid storage bag cavity are further formed in the second bag body. A pressurizing medium is injected into the pressurizing bag cavity through the first injection port, so that the first bag body expands outwards until the blood stopping medium in the liquid storage bag cavity overflows from the liquid overflowing hole, the blood stopping medium enters a medullary cavity, the blood stopping medium is injected into the pressurizing bag cavity through the second injection port, and the blood stopping medium in the liquid storage bag cavity flows out from the liquid overflowing hole. Meanwhile, the second capsule body is attached to the inner surface of the medullary cavity, the wound surface in the medullary cavity is pressurized, and the dual hemostasis effect is achieved.

The modular intramedullary fixation device is a multi-piece bone fixation device for insertion into the medullary cavity of a bone. In one embodiment, the modular intramedullary fixation device is formed from a plurality of substantially Z-shaped modular elements, which are assembled together to a desired length and width. In additional embodiments, the modular intramedullary fixation device includes a proximal portion, a distal portion, and a connector for connecting the two portions to each other. The connector may be provided in a wide variety of configurations, including an adjustable connector for adjusting the length of the modular intramedullary fixation device. Each of the proximal and distal portions may further have an adjustable length.

The utility model relates to the technical field of orthopedic medical instruments, and discloses a tibial prosthesis structure. Comprising a tibia prosthesis and a medullary cavity insertion section which are detachably connected, a first groove is formed in the outer side wall of the tibia prosthesis, a third groove is formed in the outer side wall of the medullary cavity insertion section, and the first groove and the third groove are sequentially communicated to form a long groove used for placing an implanted bone. The long groove is a bone grafting space extending in the length direction of the tibia prosthesis structure, the bone grafting material is contained in the long groove, on one hand, the bone grafting part can be prevented from protruding after an operation, and the occurrence rate of wound complications is reduced; on the other hand, healing of the patellar ligament and the bone grafting part is facilitated, the patellar ligament fracture risk is reduced, and the knee joint function of a patient is improved.

A portable device is configured to connect directly to an intraosseous (IO) catheter and provide a clinician with actionable information to determine whether the catheter is placed correctly, such as whether the catheter is placed in the medullary cavity of bone. The device provides this information leveraging the presence or absence of arterial pressure waveforms. A method for assessing placement of an intraosseous catheter includes coupling a pressure transducer to an IO catheter placed in tissue, obtaining a continuous pressure waveform from a pressure signal provided by the pressure transducer, and assessing placement of the catheter based on the continuous pressure waveform.

The invention provides a femoral intramedullary nail system, which comprises a medullary cavity registration modeling unit used for performing three-dimensional reconstruction based on a patient preoperative CT or MRI image, automatically extracting femoral medullary cavity boundary, curvature radius and neck-shaft angle parameters, and generating an individualized medullary cavity geometric model; the intramedullary nail customization design unit is used for automatically matching the diameter, curvature and front rake angle of the intramedullary nail according to the medullary cavity model, ensuring that the gap between the outer diameter of the intramedullary nail and the inner diameter of the medullary cavity is less than or equal to 0.2 mm, and designing a radial limiting rib at the near end of the intramedullary nail to form multi-point contact support; according to the anti-swing matching structure, the head of the intramedullary nail adopts a double-spherical-surface-conical composite matching interface; according to the technical scheme, the intramedullary nail structure customization and surface hydroxyapatite gradient coating deposition are achieved through the metal 3D printing technology, continuous elastic modulus transition is formed at the near end and the far end of the intramedullary nail, and the fixing stability is remarkably improved, and the pendulum effect is restrained.

The invention relates to the technical field of medical instruments, in particular to an eccentric femoral medullary cavity reamer special for minimally invasive hip replacement surgery, which comprises a support component, a guide device slidably sleeved at the top end of the support component, and a contact device fixedly mounted at the side end of the guide device and comprises a nut, a screw, a medullary cavity file puller and a medullary cavity file. The medullary cavity file is installed at one end of the medullary cavity file puller, the screws are symmetrically and fixedly installed at the other end of the medullary cavity file puller, the nuts are connected to outer rings of the screws in a threaded and sleeved mode, the guiding device comprises an impact head, a positioning disc and a movable frame, the impact head is fixedly installed at the center of the side end of the positioning disc, and the movable frame is fixedly installed at the side end, away from the impact head, of the positioning disc. The supporting component comprises a regulation and control device, a positioning device and a matching device. Through the arrangement of the contact device, the guide device and the supporting component, the purpose of integrating positioning type displacement and synchronous limitation of the eccentric femoral marrow cavity reamer is achieved.

A system for percutaneous fixation and stabilization of a fracture site using a spanning expandable structural frame for placement in an intramedullary cavity of a bone includes an expandable medical device.

The application discloses a prosthesis capable of fixing a proximal femur in hip joint revision surgery and relates to the technical field of medical devices.The prosthesis comprises a femoral stem body and a dynamic auxiliary structure.The dynamic auxiliary structure comprises a side groove, a counterweight and a limiting seat.The side groove is provided through the wide side of the femoral stem body.The two side ports of the side groove are provided with elastic plates, and the side groove is provided with a guide rod.The counterweight is movably sleeved on the guide rod.A traction spring is arranged between the top of the counterweight and the end of the side groove.The two sides of the counterweight are embedded with protrusions.The limiting seat is arranged on the inner wall of the side groove and located on the two sides of the counterweight.A guide column is slidably arranged through the limiting seat, and the end of the guide column close to the counterweight is provided with a transmission seat corresponding to the protrusions.The prosthesis can reduce the micromotion of the prosthesis and the femoral medullary cavity, promote bone ingrowth, reduce the incidence of long-term loosening, activate osteoblast activity, inhibit osteoclast proliferation, maintain the bone mass around the prosthesis, and prolong the service life of the prosthesis.

The invention discloses a knee joint replacement prosthesis, and relates to the technical field of medical instruments. The knee joint replacement prosthesis comprises a patella connecting assembly, the patella connecting assembly comprises a patella supporting platform and a supporting rod, and one end of the supporting rod is fixedly connected with the patella supporting platform; the tibia oversleeve is arranged on the supporting rod in a sleeving manner; one end of the medullary cavity handle is fixedly connected with the other end of the supporting rod through a connecting assembly, a separation groove is formed in the other end of the medullary cavity handle, the forming direction of the separation groove is the same as the axial direction of the medullary cavity handle, and the end of the medullary cavity handle is divided into a plurality of elastic sections through the separation groove. The diameter of the end of the medullary cavity handle is variable, the medullary cavity handle can smoothly stretch into the preset position of the medullary cavity, the resilience force generated by deformation of the elastic section can increase the friction force between the medullary cavity handle and the medullary cavity, and therefore the stability of fixation between the medullary cavity handle and the medullary cavity is enhanced; therefore, the knee joint replacement prosthesis improves the stability after the prosthesis is implanted into the bone.

This application discloses an automatic analysis method for CT images of long bones in mice and rats, relating to the field of image processing technology. The method includes: acquiring a CT image sequence of the target long bone, extracting the three-dimensional spatial distribution of bone tissue, and performing pose alignment and three-dimensional cropping to obtain a standardized bone image sequence; then constructing candidate depth intervals based on butterfly-shaped anatomical features and key points of growth plate strip-shaped gaps, respectively, and obtaining a fine search range through intersection operation; subsequently identifying candidate slices of triangular fractures and determining the anatomical zero point; finally, mapping the target analysis region based on the anatomical zero point, completing cortical bone segmentation, medullary cavity segmentation, and trabecular bone extraction under closed mask constraints, and outputting quantitative parameters of bone tissue. This application achieves accurate positioning of the growth plate and unified analysis region mapping in long bone CT images, improving the accuracy of trabecular bone extraction and the consistency of bone tissue quantification results.

The invention relates to the technical field of orthopedic surgical instruments, in particular to a femoral marrow cavity cushion block for rebuilding, an implanting device and an implanting method. The femoral medullary cavity cushion block comprises a first wedge block and a second wedge block, when the wedge faces of the first wedge block and the second wedge block abut against each other, the opposite faces are arc faces, and the arc faces of the first wedge block and the second wedge block are matched with the medullary cavity wall and provided with guide structures. The implanter comprises a fixing base, a first detachable guide plate and a second detachable guide plate, the fixing base is configured to be matched with the femur of a patient and installed at the preset position in the unique positioning posture, the guide plates are matched with the guide structure through a matching structure, and the first wedge block and the second wedge block can be guided into a bone defect area in the first preset posture and the second preset posture. Through cooperation of the split type wedge-shaped cushion block and the special implanter and guide positioning of the guide plate, precise implantation of the cushion block in a bone defect area is achieved, the fitting degree of the cushion block and the medullary cavity wall and the overall structure stability are improved, implantation deviation is reduced, reliable support is provided for a femoral stem prosthesis, and the revision operation effect and long-term safety are guaranteed.

The utility model discloses a long bone fracture dislocation reduction fixator which comprises an arc-shaped bottom provided with an arc surface, and the arc-shaped bottom supports a normal bone and a dislocation bone through the arc surface; the upper reduction forceps comprise an upper handheld end and an upper occlusion end; the lower reduction forceps and the upper reduction forceps are connected through a rotating shaft, the lower reduction forceps comprise a lower handheld end and a lower occlusion end, the upper occlusion end abuts against the arc-shaped bottom, and the lower occlusion end abuts against the malposed bone; the bone screw is arranged on a normal bone, and at least part of the bone screw extends into a dislocated bone. During reduction, the upper occlusion end abuts against the arc-shaped bottom, the lower occlusion end abuts against the malposed bone, the malposed bone is reduced to the normal position, the medullary cavity axis of the malposed bone coincides with the medullary cavity axis of the normal bone, at the moment, the malposed bone is fixed to the normal bone through the bone screw, reduction of the bone is achieved, and it is guaranteed that the fracture position does not deviate or distort any more.

The invention provides a reamer and an assembling method thereof, and relates to the technical field of medical instruments. The reamer comprises a drill tail, a double-face convex bead connecting piece, a double-face concave bead connecting piece and a drill bit. The two ends of the double-face convex bead and the double-face concave bead connecting piece are connected with the drill tail and the drill bit respectively. By means of the flexible shaft structure, sufficient rigidity and torque transmission efficiency are guaranteed, meanwhile, good space adaptability and path adjustability are achieved, continuous and smooth steering can be achieved in a medullary cavity along a complex anatomical path, multi-angle bone channel reaming through a single incision is supported, the number of puncture times and instrument replacement are reduced, and operation is easy and convenient. The risks of tissue damage, bleeding and infection are reduced. Meanwhile, the multi-channel positioning precision and collaboration are improved, the screw layout is optimized, the internal fixation stability is enhanced, the perspective frequency and X-ray exposure in the operation are reduced, and the operation safety and efficiency are improved. The invention is suitable for percutaneous minimally invasive fixation of complex pelvic fracture, and breaks through the application limitation of traditional rigid instruments.

The utility model discloses a kind of hip joint prostheses for retaining femoral greater trochanter, including femoral proximal end prosthesis, bone healing structure, connecting rod and femoral stem. Femoral proximal end prosthesis includes femoral neck prosthesis and greater trochanter connecting part, preset included angle is formed between the two, greater trochanter connecting part is used for resetting retained femoral greater trochanter;Bone healing structure is arranged at the outside of preset included angle, and is connected with retained femoral greater trochanter by bone growth mechanism;Connecting rod is connected with the bottom end of femoral proximal end prosthesis;Femoral stem is connected with the bottom end of connecting rod, for inserting into femoral medullary cavity.In installation process, perfect femoral greater trochanter does not need to be removed, femoral greater trochanter is successfully retained, so that patient's gluteus medius and vastus lateralis muscle can be retained, the destruction to the stop of gluteus medius and vastus lateralis muscle is avoided, so as to improve the functional recovery effect after operation. The connection of hip joint prosthesis and retained femoral greater trochanter is realized by bone healing structure, and the stability and durability of connection are improved.

The utility model relates to the field of medullary cavity files, in particular to a medullary cavity file beating and pulling device which is characterized in that a mounting piece is fixedly arranged on a medullary cavity file, a mounting cavity is formed in a beating and pulling assembly corresponding to the mounting piece in a matched mode, and a plurality of clamping cavities are vertically formed in the mounting piece; a plurality of vertical cavities are transversely formed in the beating and pulling assembly in a penetrating mode, clamping pieces are vertically and movably arranged in the vertical cavities, the clamping pieces are matched with the clamping cavities, and limiting pieces used for locking the clamping pieces are further movably arranged in the beating and pulling assembly. According to the medullary cavity file, the mounting piece is inserted into the mounting cavity and is matched with the fixed clamping between the clamping piece and the clamping cavity, and finally the clamping piece is locked through the limiting piece, so that the fixed connection between the beating and pulling assembly and the medullary cavity file can be realized, the mounting mode of the medullary cavity file is simple and convenient, and the medullary cavity file is convenient for a user to use.

The utility model discloses a kind of absorbable rib fixation nails, made of high molecular absorbable material integrated, including shank part and the clamping portion of both ends of shank part, clamping portion is equipped with bifurcation structure with opening towards non-connection shank part one end, at least one branch outside of bifurcation structure is equipped with inverted tooth structure, inverted tooth structure end is conical or triangular, the width of bifurcation structure is greater than the width of shank part.The utility model can be made into nail body by absorbable material, clamping portion end bifurcation, inverted tooth structure can be fixed after being expanded in marrow cavity and increasing friction, wide conical end is easily placed into marrow cavity and can play anti-rotation, anti-removal effect, fixed firm and not easy to displace, without suture reinforcement to prevent affecting periosteal blood supply and nerve compression, after fracture healing, fixation nail can be degraded and absorbed, without secondary operation removal, after absorption, chest CT, MRI examination has no influence, more promotional, can better improve the user's use experience.

Devices, systems, instruments, and methods for promoting healing and stability for bone fractures. A targeted interlocking plate-nail system may include an intramedullary nail configured to extend through a medullary canal of a long bone, a bone plate configured to be positioned against an exterior surface of the long bone, and a plurality of fasteners configured to extend through the bone plate, through the intramedullary nail, or through both the bone plate and the intramedullary nail, thereby interlocking the bone plate and the intramedullary nail together. Targeting instruments may be used for guiding the components into position.

The present application relates to the technical field of orthopedic medical devices, and particularly relates to a distal femoral fracture medial column support anti-rotation intramedullary nail system, which comprises a main nail configured to be implanted into the femoral medullary cavity from the medial condyle of the femur, extends along its axial direction and has a tail part and a head part; the tail part is provided with an anchoring part for anchoring in the cancellous bone inside the medial condyle of the femur, and the head part is provided with at least one first locking hole; a tension nail configured to be transversely implanted from the medial condyle of the femur to the lateral condyle of the femur and to pass through the tail part of the main nail, for connecting the medial condyle of the femur with the lateral condyle of the femur; and a locking nail configured to pass through the first locking hole of the head part of the main nail, for anchoring the head part of the main nail in the boundary area of the cortical bone and cancellous bone of the lateral condyle of the femur. The intramedullary nail system provides reliable medial column axial support and anti-rotation stability for the distal femoral fracture through minimally invasive implantation from the medial condyle of the femur.

The invention provides a three-dimensional total hip replacement prosthesis type selection method and device based on reinforcement learning, a medium, a program product and a terminal, and the method comprises the steps: obtaining the medullary cavity form and prosthesis three-dimensional data, screening and training a prosthesis model, carrying out the structural division, limiting calculation and geometric simplification, and generating polyhedral data, and finally, generating a model selection model on a Unity platform by utilizing reinforcement learning, and selecting an optimal prosthesis model for replacement. According to the method, the regions can be automatically segmented in the medullary cavity, the anatomical mark points can be identified in an auxiliary manner, intelligent detection and planning of the THA operation are realized, the labor cost is greatly reduced, the diagnosis efficiency is improved, and personalized clinical requirements are met. The optimization algorithm improves the accuracy and speed, reduces the consumption of computing resources, and can provide efficient surgical planning even in areas with limited medical resources.

The application provides a femoral stem prosthesis, which comprises a femoral stem, an expansion component and a sleeve. The femoral stem is composed of an upper stem body and a replaceable lower stem body, and is internally provided with a thread. The expansion component is located in the upper stem body and comprises a screw, a rotating disc and a multi-layer pushing structure. The screw is connected with the upper and lower stem bodies through the thread; the rotating disc is in threaded engagement with the screw and can drive a first pushing part along a first guide rail when rotating. The rail component contains a ratchet, which is in engagement with a pawl of a second pushing part, and the second pushing part is laterally provided with an opening. The sleeve is linked with the expansion component through a fifth pushing part, a fourth pushing part and a third pushing part. When implanted, the second pushing part pushes the sleeve outward to adhere to the wall of the medullary cavity, and the reaction force makes the internal pushing structure act successively, so that the first pushing part is finally separated from the second pushing part. Then, bone cement is injected through the micropore of the sleeve, so as to enhance the stability of the prosthesis. The design realizes intraoperative adaptation and stable filling.