46 results about "Bone Lengthening" patented technology

The invention discloses a single-side double-rail combined skeletal external fixation device, which consists of a flat-rotation bone needle clip, an L-shaped bone needle clip, a main guide rail, guide rail nuts, a movable bone needle clip, a perpendicular foot rectification bracket, a metatarsal bone needle regulation mechanism, a calcaneus bone needle regulation mechanism, a regulation cushion, a spindle bolt, an auxiliary support mechanism and a bone needle, wherein the flat-rotation bone needle clip ( or the L-shaped bone needle clip) is connected with the main guide rail via the spindle bolt; the guide rail nuts are respectively screwed onto two sides of the movable bone needle clip on the main guide rail; the perpendicular foot rectification bracket is clamped on the proper position of the main guide rail; the metatarsal bone needle regulation mechanism is respectively clamped on the corresponding positions of a small guide rail and the main guide rail; the calcaneus bone needle regulation mechanism is also clamped on the corresponding positions of the small guide rail and the main guide rail; the auxiliary support mechanism is clamped and fixedly arranged on the main guide rail; the flat-rotation bone needle clip, the L-shaped bone needle clip and the movable bone needle clip are used for clamping the bone needle to form the main body of the single-side double-rail combined skeletal external fixation device. The single-side double-rail combined skeletal external fixation device can be used for skeletal external fixation, bone lengthening, bone transportation, perpendicular foot rectification and O, X and K-leg orthopaedics.

A device for maxillary jawbone and dentition expansion and / or retraction is configured for mounting within the mouth and connects the right and left halves of the skull. The maxillary distraction device includes at least two implantable anchors configured to be implanted in the maxillary bones of the skull on opposite sides of a midline of the skull. A facebow having two posterior ends is connectable to the implantable anchors and is configured to extend from the maxillary regions entirely within the mouth across the midline of the skull. The facebow has at least one expandable section for bone lengthening. The facebow is connected to the anchors and is lengthen periodically to lengthen the maxillary bones. The facebow may provide horizontal, vertical, and transverse distraction.

This distraction device comprises a rod (1), a second rod (2) and means to control the translation of one rod relative to the other (3), so as to cause the desired distraction or compression. Each rod (1) and (2) has a first end, respectively (11) and (21), which receive means to link to a part of the organism such as hooks or screws for vertebra, ribs or the pelvis, and a second end, respectively (12) and (22), linked to the means to control the translation of one rod relative to the other (3) such that the direction of the first end (11) toward the second end (12) of the first rod (1) is roughly the same as the direction of the first end (21) toward the second end (22) of the second rod (2). The distraction device thus roughly forms a J, the bulging and rigid part of which is located outside the area concerned by the surgical treatment, facilitating its implantation. It is useful for straightening of the spine and bone lengthening, deformity correction or transport, depending on the means used to link to the organism.

The invention discloses a self-adjusting orthopedic external fixator which comprises at least two fixing rings, a knighthead, an adjusting nuts positioned on the knighthead and used for fixing and adjusting the distance between the two retainers, a Kirschner wire, a thread needle fixture and a pressure sensor positioned on the knighthead as well as a driving system and a PLC automatic control system which are corresponding to the adjusting nuts; wherein, the driving system adopts a ratchet, a ratchet rod and a gear structure. The self-adjusting orthopedic external fixator of the invention controls and adjusts the relative position between the two retainers automatically, avoids errors caused by manual manipulation, ensures that all knightheads are uniformly forced and avoids deviation caused by disequilibrium of the knightheads; besides, the self-adjusting orthopedic external fixator has convenient operation, thus ensuring that the processes of fracture healing and bone lengthening are operated smoothly to improve efficiency and success rate of operation and alleviate the suffering of the sufferer.

The invention provides a unilateral two-arm adjustable two-way dual-power bone lengthening pressurized locking external fixator and belongs to the technical field of bone treatment instruments. The external fixator aims at solving the problem of limb shortening caused by lower limb thighbone large-segment splintered fracture long treatment concurrent large-segment bone defects. The external fixator comprises two or three or four steel nail splint linked clamps arranged between a main arm threaded rod and an auxiliary arm threaded rod side by side. The positions of upper steel nail splints and lower steel nail splints of the steel nail splint linked clamps on vertical adjustment threaded rods are adjusted through nuts. Upper end holes of connecting plates are connected with the auxiliary arm threaded rod, the positions of the connecting plates on the auxiliary arm threaded rod are adjusted through nuts on the two sides, lower end holes of the connecting plates are connected with the vertical adjustment threaded rods, chutes are formed in the main arm threaded rod, and convex plates are in sliding fit with the chutes. A power nut is arranged between every two adjacent convex plates. The positions of the convex plates on the main arm threaded rod are adjusted through the power nuts. The convex plates are fixed to the main arm threaded rod through screws after the positions are adjusted. The external fixator is mainly used for bone injury treatment.

The invention discloses a bone lengthening scaffold. The bone lengthening scaffold comprises a first connecting rod assembly, a front end transfer sliding block assembly, a tail end rotating sliding block assembly and sliding rails, wherein the guide rails serve as a main scaffold; the front end transfer sliding block assembly and the tail end rotating sliding block assembly are connected onto the guide rails in a sliding fit manner; the first connecting rod assembly is connected with the front end transfer sliding block assembly and the tail end rotating sliding block assembly. The positions of the front end transfer sliding block assembly and the tail end rotating sliding block assembly on the sliding rails can be adjusted by adjusting the first connecting rod assembly.

The invention relates to a self-control intramedullary bone prolong device, which is formed by left fixing end (1), left connecting sheath (3), motor (4), motor support (5), copper sheath (60, guide key (7), outer cylinder (8), inner cylinder (9), central screw (10), and right fixing end (12). When in surgery, it can be planted into intramedullary to connect the bone with pin; when the motor rotates, the central screw rotates to axially move the inner cylinder to prolong the bone; when the motor stops, the device is stopped to fix the bone; when the motor rotates reversely, it can contract the bone. The invention has little hurt on human, while its length can be adjusted and the minimum drawn length in one time is 0.1mm.

The invention discloses an intramedullary nail and relates to an internal fixing device and a medical instrument in a human body marrow cavity. Existing intramedullary nails cannot solve the problem of shortening of bones and have no bone lengthening function when being used for treating bone fractures. The intramedullary nail mainly comprises an intramedullary nail tube (1) with an inner thread, an intramedullary nail screw (2) with an outer thread and a specially-shaped ratchet mechanism (3). In the beginning, most of the upper part of the intramedullary nail screw (2) with the outer thread is screwed in the intramedullary nail tube (1) with the inner thread, the tail end of the lower part of the intramedullary nail screw (2) with the outer thread is inserted in a ratchet hole of the specially-shaped ratchet mechanism (3), and the specially-shaped ratchet mechanism (3) drives the intramedullary nail screw (2) with the outer thread to rotate in the intramedullary nail tube (1) with the inner thread through repeated rotation of the specially-shaped ratchet mechanism (3) in a specific direction and reverse rotation of the specially-shaped ratchet mechanism (3), so that the whole intramedullary nail is lengthened, and the intramedullary nail can be used as an instrument for bone lengthening and fracture operations.

The invention discloses a minimally invasive skeletal external fixation device for correcting foot accelerator drop and talipes varus. The minimally invasive skeletal external fixation device consists of an anti-toe-bending frame, a metatarsus needle adjuster, a heel bone needle adjuster, a heel bone needle adjuster bracket, a metatarsus needle adjuster bracket, an arc-shaped frame, a distal end bone needle clamp, an adjusting nut, a movement bone needle clamp, a proximal end bone needle clamp, a guide rail, a distal end bone needle, a movement bone needle, a proximal end bone needle, a heel bone needle and a metatarsus bone needle, wherein the guide rail is an assembly of the minimally invasive skeletal external fixation device; the anti-toe-bending frame and the metatarsus needle adjuster are connected with the metatarsus needle adjuster bracket clamped on the guide rail; the heel bone needle adjuster is connected with the heel bone needle adjuster bracket clamped on the guide rail; the distal end bone needle clamp, the movement bone needle clamp and the proximal end bone needle clamp are inserted into the guide rail, and are used for clamping corresponding bone needles; and the arc-shaped frame is clamped on the guide rail. The minimally invasive skeletal external fixation device can be used for correcting foot accelerator drop and talipes varus, performing one-time treatment on a patient suffering from foot accelerator drop, talipes varus, talipes valgus, bone lengthening, bone movement and the like and treating a patient suffering from one disease.

The invention discloses an implantable prosthetic device capable of lengthening an amputation stump at the middle-upper section of a femur. The implantable prosthetic device comprises a first intraosseous implantation part and a second intraosseous implantation part, the second intraosseous implantation part is telescopic, the second intraosseous implantation part comprises a traction section anda driving section, in a use state, the first intraosseous implantation part penetrates through the vertex of a femoral trochanter to extend to the femoral section, a screw is arranged on the lower portion of the second intraosseous implantation part, the second intraosseous implantation part penetrates through the femur, the traction section is fixed to the femur, the driving section is in slidingconnection with the traction section, The upper end of the driving section abuts against the first intraosseous implantation part, and the lower end of the driving section extends out of the stump. By means of the device, for limb shortening caused by various reasons clinically, bone lengthening can be conducted through a bone carrying technology provided by an orthopedist llizarov, and the problem of limb shortening is solved through a tissue tension stress rule; the problem of continuous amputation in a later period can be completely eradicated, and pain and economic burdens of a user are greatly relieved; and a connecting structure enables a prosthesis to be firmly connected with the stump femur.

The present disclosure provides an adjustable external fixator which can be utilized in bone transport or bone lengthening. The adjustable external fixator includes a body, a positioning member, a bone coupling member, and a threaded rod. The body includes a slideway. At least one of the positioning member and the bone coupling member is slidably coupled to the slideway of the body.

The invention discloses an external fixation support for bone lengthening, which mainly comprises semicircular connecting rods, bone needles, lengthener components and support rods, wherein the two semicircular connecting rods are shaped like an open pentagon and arranged up and down in parallel; the two support rods are equidistantly arranged in parallel at the ends of the central edges of the semicircular connecting rods in the axial direction; the ends of the support rods are in fastened connection with the semicircular connecting rods via rod-rod fastening clips respectively; the bone needles are simultaneously arranged at the ends and the central positions of the semicircular connecting rods respectively; the bone needles are in fastened connection with the semicircular connecting rods via needle-rod fastening clips respectively; and the lengthener components comprise the support rods, locking nuts, adjusting core rods and adjusting handles. The external fixation support has the advantages of simple structure, low manufacturing cost, small size, firmness and reliability in fixation and convenient and simple operational program, and is a multifunctional external fixation support that can fulfill fixation and pressurization and also can realize malformation correction or lengthening of bones.

The invention discloses an improved unilateral double-track bone moving outer frame. The improved unilateral double-track bone moving outer frame is characterized by comprising a first sliding rod, asecond sliding rod, moving blocks and fixing screws. The bone moving outer frame is designed into unilateral fixation and double tracks, the moving blocks used for being connected with the fixing screws are more stable, the unilateral fixation can conveniently correct the position of a broken bone in the whole bone lengthening process, the position of the broken bone can be finely adjusted only byadjusting the fixing screws, and it is guaranteed that the deviation of the bone growth joint is minimum after healing; the more the joint is folded, the faster and firmer the bone healing is; and few holes are drilled in the bone, the bone surface is slightly injured, and important tissues such as nerves and blood vessels are not easily injured.

The invention relates to a hip joint dislocation reset traction device, which consists of an ilium bone needle, an ilium bone needle clamp, a connecting plate, a triangular force application frame, regulating and fixing screw nuts, an auxiliary guide rail, a near end thigh bone needle clamp, a main guide rail, a thigh bone needle, a far end thigh bone needle clamp and a guide sleeve, wherein the ilium bone needle clamp is a plate element with the curvature similar to the curvature of the human body ilium bone and is combined with the ilium bone needle, the lower part of the ilium bone needle clamp is connected with the connecting plate, the connecting plate is screwed with the main guide rail, the triangular force application frame is fixedly clamped on the main guide rail, the auxiliary guide rail is arranged on the triangular force application frame in a penetrating way, and the regulating and fixing screw nuts and screws are respectively used for combination. The far end thigh bone needle clamp and the near end thigh bone needle clamp are respectively arranged at the far end of the main guide rail in a penetrating way, the regulating and fixing screw nuts are respectively screwed on the main guide rail arranged at the two sides, and the thigh bone needle is penetrated and clamped on the near end thigh bone needle clamp and the far end thigh bone needle clamp. The hip joint dislocation reset traction device is applicable to hip joint dislocation reset, is also applicable to hip joint dislocation reset and patients with short sick legs requiring the thigh bone lengthening, is also applicable to hip joint dislocation reset and patients with sick legs requiring thigh bone shortening, and can also be used for femoral head slipped epiphysis correction on juveniles.

The invention discloses a single-side double-rail combined skeletal external fixation device, which consists of a flat-rotation bone needle clip, an L-shaped bone needle clip, a main guide rail, guide rail nuts, a movable bone needle clip, a perpendicular foot rectification bracket, a metatarsal bone needle regulation mechanism, a calcaneus bone needle regulation mechanism, a regulation cushion, a spindle bolt, an auxiliary support mechanism and a bone needle, wherein the flat-rotation bone needle clip ( or the L-shaped bone needle clip) is connected with the main guide rail via the spindle bolt; the guide rail nuts are respectively screwed onto two sides of the movable bone needle clip on the main guide rail; the perpendicular foot rectification bracket is clamped on the proper position of the main guide rail; the metatarsal bone needle regulation mechanism is respectively clamped on the corresponding positions of a small guide rail and the main guide rail; the calcaneus bone needle regulation mechanism is also clamped on the corresponding positions of the small guide rail and the main guide rail; the auxiliary support mechanism is clamped and fixedly arranged on the main guide rail; the flat-rotation bone needle clip, the L-shaped bone needle clip and the movable bone needle clip are used for clamping the bone needle to form the main body of the single-side double-rail combined skeletal external fixation device. The single-side double-rail combined skeletal external fixation device can be used for skeletal external fixation, bone lengthening, bone transportation, perpendicular foot rectification and O, X and K-leg orthopaedics.

The invention discloses an intramedullary bone lengthening device using memory alloy spring electromagnetic heating. The device comprises an intramedullary bone lengthening assembly and an electromagnetic heating temperature control assembly, wherein the intramedullary bone lengthening assembly comprises an upper intramedullary nail and a lower intramedullary nail, and a memory alloy spring is arranged between the upper intramedullary nail and the lower intramedullary nail; the electromagnetic heating temperature control assembly comprises a temperature sensing module, an in-vitro electromagnetic heating module and a temperature control module; the sensing end of the temperature sensing module is in contact with the memory alloy spring so that the accurate temperature of the in-vivo memoryalloy spring can be accurately acquired; meanwhile, the temperature sensing module converts acquired temperature signals into digital signals and sends the digital signals to the temperature controlmodule, and the temperature control module analyzes and compares the real-time temperature with a preset target temperature so that the temperature control module can accurately control the electromagnetic heating module according to a comparison result, then the deformation range of the memory alloy spring is accurately controlled, and the precision of a bone lengthening correction operation is guaranteed.

The invention relates to a hip joint dislocation reset traction device, which consists of an ilium bone needle, an ilium bone needle clamp, a connecting plate, a triangular force application frame, regulating and fixing screw nuts, an auxiliary guide rail, a near end thigh bone needle clamp, a main guide rail, a thigh bone needle, a far end thigh bone needle clamp and a guide sleeve, wherein the ilium bone needle clamp is a plate element with the curvature similar to the curvature of the human body ilium bone and is combined with the ilium bone needle, the lower part of the ilium bone needle clamp is connected with the connecting plate, the connecting plate is screwed with the main guide rail, the triangular force application frame is fixedly clamped on the main guide rail, the auxiliary guide rail is arranged on the triangular force application frame in a penetrating way, and the regulating and fixing screw nuts and screws are respectively used for combination. The far end thigh bone needle clamp and the near end thigh bone needle clamp are respectively arranged at the far end of the main guide rail in a penetrating way, the regulating and fixing screw nuts are respectively screwed on the main guide rail arranged at the two sides, and the thigh bone needle is penetrated and clamped on the near end thigh bone needle clamp and the far end thigh bone needle clamp. The hip joint dislocation reset traction device is applicable to hip joint dislocation reset, is also applicable to hip joint dislocation reset and patients with short sick legs requiring the thigh bone lengthening, is also applicable to hip joint dislocation reset and patients with sick legs requiring thigh bone shortening, and can also be used for femoral head slipped epiphysis correction on juveniles.

The invention discloses a minimally invasive skeletal external fixation device for correcting foot accelerator drop and talipes varus. The minimally invasive skeletal external fixation device consists of an anti-toe-bending frame, a metatarsus needle adjuster, a heel bone needle adjuster, a heel bone needle adjuster bracket, a metatarsus needle adjuster bracket, an arc-shaped frame, a distal end bone needle clamp, an adjusting nut, a movement bone needle clamp, a proximal end bone needle clamp, a guide rail, a distal end bone needle, a movement bone needle, a proximal end bone needle, a heel bone needle and a metatarsus bone needle, wherein the guide rail is an assembly of the minimally invasive skeletal external fixation device; the anti-toe-bending frame and the metatarsus needle adjuster are connected with the metatarsus needle adjuster bracket clamped on the guide rail; the heel bone needle adjuster is connected with the heel bone needle adjuster bracket clamped on the guide rail; the distal end bone needle clamp, the movement bone needle clamp and the proximal end bone needle clamp are inserted into the guide rail, and are used for clamping corresponding bone needles; and the arc-shaped frame is clamped on the guide rail. The minimally invasive skeletal external fixation device can be used for correcting foot accelerator drop and talipes varus, performing one-time treatment on a patient suffering from foot accelerator drop, talipes varus, talipes valgus, bone lengthening, bone movement and the like and treating a patient suffering from one disease.

The invention discloses a novel bone lengthening intramedullary nail. A main nail of the novel bone lengthening intramedullary nail is composed of an upper nail body and a lower nail body, the upper nail body and the lower nail body are both of a hollow structure and are connected through a connecting pin, a long sliding groove is formed in the upper part of the lower nail body in the axial direction, the connecting pin can slide up and down along the long sliding groove, and the diameter of the upper nail body is larger than that of the lower nail body. A lengthening device is installed between the interior of the pipe wall of the upper nail body and the upper end of the lower nail body, a dynamic screw hole and a static screw hole are formed in the upper nail body, a fixing screw hole isformed in the lower nail body, an adjusting hole is formed in the lower section of the lower nail body, and a dynamic bone screw, a static bone screw and a fixing bone screw are correspondingly installed in the dynamic screw hole, the static screw hole and the fixing screw hole. The dynamic bone screw can move up and down along the dynamic screw hole, a tail cap is installed at the top end of theupper nail body, and a first elastic body is arranged between the tail cap and the dynamic bone screw. Compared with a bone lengthening mode of an external fixation support method, the defects of nail path infection, joint dysfunction, complex operation and the like can be reduced, operation and control are easy, and complications of the bone lengthening mode of the external fixation support canbe effectively avoided.

The invention discloses a miniature external fixation combined frame for treating interphalangeal joint comminuted fracture (pion fractures) of hands, is a medical instrument and is mainly suitable for treating the interphalangeal joint comminuted fracture (pion fractures) of the hands. The miniature external fixation combined frame is convenient to use and easy to operate, effectively solves theproblem that many complications occur when a traditional operation is used for treating the interphalangeal joint comminuted fracture (Pilon fracture) of the hands, greatly reduces operation difficulty and operation time, reserves the function of interphalangeal joints of fingers after the fracture operation, has the advantages of being small in trauma, easy to detach and the like, and fills the international blank. In the operation, a 3D printing individualized joint gasket is clamped and extruded in the joint, the interphalangeal joint is moved, smoothness and flatness of the interphalangealjoint surface can be achieved, and the tedious and time-consuming operation of kirschner wire fixation for reduction of comminuted joint surfaces is omitted in the operation. The miniature external fixation frame is applied to external fixation of the fracture, and the purposes of bone lengthening and bone end pressurizing can be achieved by adjusting a hollow threaded sleeve.

The development of an internal bone lengthening stabilization system with extramedullary localization to generate a dynamic axial stabilization system by the incorporation of tension-locked Kirschner wires and tension-locked cerclage wires is described.It features as a benefit the performance of bone lengthening, transports or reconstruction without any external fixation element, using the benefits of the pressure Kirschner wires in different planes without going through soft parts such as skin, cells, fascia, muscle, thereby reducing the risk of neurological and vascular injury to these elements.The present development is based on my previous patent “Canulated locking and fixation assembly for trauma surgery”, which allows the attachment of Kirschner wires, cerclage wires, ender or TENS with tension to internal extramedullary fixation elements such as locked plates or bone fixation rings.The present development has a central sliding zone of motorized lengthening, being able to use the different motorized systems currently developed for intramedullary nails.We think its main application will be for femur and tibia, but it can involve any bone if its development is considered useful.

The invention provides a novel bone lengthening device adopting intramedullary and extramedullary combination and adopting bevel gears, and relates to a medical apparatus for the orthopedics department. Two guide rods are fixed between a fixed bone connector I and a gear box, a movable bone connector slides on the two guide rods, a lead screw is screwed to an intramedullary thread sleeve, the connecting rod of the lead screw rotatably penetrates through an intramedullary shaft base and is fixedly provided with a driven gear, a lower transmission gear in the gear box is meshed with the driven gear, a bevel gear drive box is fixed on a fixed bone connector II, a transmission shaft is rotatably arranged between the bevel gear drive box and the gear box, an upper transmission gear is fixed atone end, positioned in the gear box, of the transmission shaft and is meshed with the lower transmission gear, a horizontal bevel gear is fixed at one end, positioned in the bevel gear drive box, of the transmission shaft, the horizontal bevel gear is meshed with a vertical bevel gear, a shaft barrel fixedly communicates with the upper end of the bevel gear drive box, a driving shaft is rotatablyarranged in the shaft barrel, the lower end of the driving shaft is fixedly connected with the vertical bevel gear, and a handholding rotating handle is fixed at the upper end of the driving shaft. The traction lengthening for the skeleton can be carried out at any time, and the treatment time is shortened.

The invention provides a novel bone lengthening device adopting a belt pulley, and relates to a medical apparatus for the orthopedics department. Two guide rods are fixed between a fixed bone connector I and a fixed bone connector II, a movable bone connector slides on the two guide rods, one end of a lead screw is inserted in an axial hole of the connecting end of the fixed bone connector I through a thrust ball bearing, the movable bone connector is in threaded connection with the lead screw, the connecting rod of the fixed bone connector II is rectangular-groove-shaped and is provided witha shaft sleeve in a communicating manner along the axial direction, the other end of the lead screw rotatably extends into the fixed bone connector II through the shaft sleeve, the bottom end of a belt pulley drive box is arranged to be open and is fixed to the groove opening of the fixed bone connector II, a flange plate is fixed to the top end of the belt pulley drive box, a hand-holding rotating rod is rotatably mounted in a center hole of the flange plate, an upper transmission wheel is fixed to the inner end of the hand-holding rotating rod, a lower transmission wheel is fixed to the other end of the lead screw, and a transmission belt sleeves between the lower transmission wheel and the upper transmission wheel. The traction lengthening for the skeleton can be carried out at any time, the treatment time is shortened, and the pain of patients is alleviated.

The invention provides a novel intramedullarily and extramedullarily bound bone lengthening device adopting a rope wheel, and relates to a medical instrument in orthopedics department. Two guide rodsare fixed between a fixed bone combination element 1 and a gear box; a movable bone combination element slides on the two guide rods; a lead screw is connected with an in-marrow threaded sleeve in a screwed mode; the lead screw connecting end rotationally passes through an in-marrow shaft seat and is fixed to a driven gear; a hollow seat is fixed on a fixed bone combination element 2; a rope wheeltransmission frame is fixed on the hollow seat; a gear shaft is rotationally arranged between the gear box and the hollow seat; one end, positioned in the gear box, of the gear shaft is fixedly provided with a transmission gear; the transmission gear and the driven gear are in engaged arrangement; the rope wheel transmission frame can drive one end, positioned in the hollow seat, of the gear shaft to rotate; a plurality of bone nails are arranged on each of the fixed bone combination element 1, the movable bone combination element, the gear box and the fixed bone combination element 2; the in-marrow threaded sleeve is fixed; and the in-marrow shaft seat is fixed. The bone traction lengthening can be performed all the time; the treatment time is shortened; and the pain of a patient is reduced.

The invention discloses an intramedullary bone lengthening device using memory alloy spring electromagnetic heating. The device comprises an intramedullary bone lengthening assembly and an electromagnetic heating temperature control assembly, wherein the intramedullary bone lengthening assembly comprises an upper intramedullary nail and a lower intramedullary nail, and a memory alloy spring is arranged between the upper intramedullary nail and the lower intramedullary nail; the electromagnetic heating temperature control assembly comprises a temperature sensing module, an in-vitro electromagnetic heating module and a temperature control module; the sensing end of the temperature sensing module is in contact with the memory alloy spring so that the accurate temperature of the in-vivo memoryalloy spring can be accurately acquired; meanwhile, the temperature sensing module converts acquired temperature signals into digital signals and sends the digital signals to the temperature controlmodule, and the temperature control module analyzes and compares the real-time temperature with a preset target temperature so that the temperature control module can accurately control the electromagnetic heating module according to a comparison result, then the deformation range of the memory alloy spring is accurately controlled, and the precision of a bone lengthening correction operation is guaranteed.

A new bone lengthening method using a force generated by own energy of a patient to activate a system based on an intramedullary telescopic nail 1, inserted into a broken bone. An outer driving module 30 connected by a cord 29, spanning either knee or elbow or femur-hip joint, where one end of the cord 29 connected to an inner driving module of the telescopic nail inserted into a broken bone and another end of said cord connected to the outer driving module attached to the second bone. The said system converts a tensile force into an axial displacement of a distal bone segment of the broken bone.It is important to attach the outer driver 30 to an appropriate spot of skeleton in consideration that the cord starts pulling anchor 31 by active or passive leg movements only after passing 80% of natural range of motion.

The invention provides a novel bone lengthening device adopting intramedullary and extramedullary combination and adopting bevel gears, and relates to a medical apparatus for the orthopedics department. Two guide rods are fixed between a fixed bone connector I and a gear box, a movable bone connector slides on the two guide rods, a lead screw is screwed to an intramedullary thread sleeve, the connecting rod of the lead screw rotatably penetrates through an intramedullary shaft base and is fixedly provided with a driven gear, a lower transmission gear in the gear box is meshed with the driven gear, a bevel gear drive box is fixed on a fixed bone connector II, a transmission shaft is rotatably arranged between the bevel gear drive box and the gear box, an upper transmission gear is fixed atone end, positioned in the gear box, of the transmission shaft and is meshed with the lower transmission gear, a horizontal bevel gear is fixed at one end, positioned in the bevel gear drive box, of the transmission shaft, the horizontal bevel gear is meshed with a vertical bevel gear, a shaft barrel fixedly communicates with the upper end of the bevel gear drive box, a driving shaft is rotatablyarranged in the shaft barrel, the lower end of the driving shaft is fixedly connected with the vertical bevel gear, and a handholding rotating handle is fixed at the upper end of the driving shaft. The traction lengthening for the skeleton can be carried out at any time, and the treatment time is shortened.