705results about How to "Improve the success rate of surgery" patented technology

The present invention provides an orthopedic surgery operation simulation system on the basis of force feedback, relating to the field of the virtual operation system development technology. The objective of the present invention is to allow users to truly sense biomechanical characteristics of human tissues so that the effect of operation training and the success rate of operations are improved. The orthopedic surgery operation simulation system comprises a virtual orthopedic operation simulation subsystem, an input module, a force feedback module and a display module. The virtual orthopedic operation simulation subsystem is configured to realize geometric modeling, mesh generation, biomechanics modeling and calculation thereof, collision detection, cutting and stitching and dynamic state visualization, force feedback calculation and the like of the human tissues required in the operation simulation process. According to the scheme of the invention, geometric modeling, mesh generation, biomechanics modeling and calculation thereof, deformation cutting, force feedback calculation and the like of virtual human tissues may be realized through independent programming on the basis of a visual studio development platform. The cost and the complexity of an operation system may be reduced.

The invention relates to an intracranial puncture locating method based on mixed reality and belongs to the field of neural imaging navigation. The method includes the steps of firstly, collecting CTscanning data of a patient with a marker, and creating three-dimensional models of the head and intracranial lesions of the patient according to the CT data; determining puncture targets, a puncture direction and puncture depth on the basis of the three-dimensional models, and creating an intracranial puncture path; finally, through rigid registration, overlapping the three-dimensional model of the head and the puncture path on a surgical part of the patient through a mixed reality technology, so that a surgeon can conduct puncture surgery under the guidance of the virtual three-dimensional models and correct puncture operation in real time according to the puncture path. Since the virtual three-dimensional modules are totally matched with a real scene, the virtual puncture patch is highlymatched with an actual situation, and therefore by conducting the puncture operation along the virtual puncture path, deviations or faults existing in traditional empirical operation are effectivelyavoided so that the purpose of improving the intracranial puncture precision and puncture efficiency can be achieved.

The invention provides a surgical robot adjustment system. Each mechanical arm is provided with an optical target lens, positions and Euler angles of the optical target lenses are measured by an optical tracking instrument, a calculation module calculates according to measured values to obtain a posture mapping relation of the optical target lenses, and a posture mapping relation of surgical instrument arms is obtained by calculation according to the posture mapping relation of the optical target lenses and a posture mapping relation between the surgical instrument arm of each mechanical arm and the optical target lens on the corresponding mechanical arm. A surgical robot controls postures of corresponding surgical instrument arms according to the posture mapping relation of surgical instrument arms, and accordingly movement control precision of the surgical robot is improved.

The invention discloses a real-time evaluation and correction method in a spine posterior approach operation. Each segment of the spine is divided by an X ray photo and is matched with each corresponding segment of a 3D model which is constructed by CT (Computed Tomography), rigid body transformation is estimated, and thus a rectification result can be obtained; on the basis, the whole spine is spliced, a real-time three-dimensional spine form of a patient on an operating table is reconstructed, an operation effect is estimated in real time, the orientation for placing a nail is corrected in time, the incorrect nail placement in an operation is remedied, the operation risk is reduced, and the success rate of the operation is improved. According to the method, the spine segments belong to rigid bodies, the whole spine belongs to a non-rigid body, and 2D / 3D images of a non-rigid body joint target are subjected to registration; the 3D positions of a pedicle screw is estimated by 2D images, and the 3D form of the spine of the patient after operation nail placement is reconstructed; the problems that visual real-time monitoring and correction lacks in the existing spine posterior approach operation, and the danger existing in the operation is not remedied in time are solved.

The invention provides a small-caliber artificial blood vessel with a three-layer composite structure, and a preparation method of the small-caliber artificial blood vessel. The small-caliber artificial blood vessel comprises a weaving inner layer, an electrostatic spinning intermediate layer and a polyurethane outer layer, wherein the electrostatic spinning intermediate layer is arranged on the outer side of the weaving inner layer; the polyurethane outer layer is arranged on the outer side of the electrostatic spinning intermediate layer; the weaving inner layer comprises a first weaving stand pipe and a second weaving bracket stand pipe; the second weaving stand pipe is a weaving stand pipe with axial yarns, and is arranged on the outer side of the first weaving stand pipe. The small-caliber artificial blood vessel adopts a simulation structure; the weaving stand pipes serve as enhancement layers and are relatively high in compliance; the electrostatic spinning intermediate layer adopts a precise three-dimensional reticular structure, so that coated drugs and growth factors are released step by step in the degradation process, thrombosis is prevented, and cell growth is facilitated; the polyurethane outer layer is relatively high in compliance and adopts a microporous structure, so that biomass transmission is facilitated; both PDO and PLLA are degradable materials, so that gradient degradation can be realized, the contact between the polyurethane material and blood can be reduced, the foreign-body reactions to the PDO and PLLA materials can be prevented, and the long-term patency rate can be improved.

The invention discloses an intravascular stent of a composite structure; the intravascular stent comprises a stent main body, wherein the distal end of the stent is restrained as an adducted form by virtue of a tightening wire, and the tightening wire is degradable magnesium alloy or degradable iron alloy; one or more auxiliary wires are woven on the stent main body; when the stent is applied to blood vessel of brain, the auxiliary wire is pure platinum or alloy thereof, pure gold or alloy thereof, pure tungsten or alloy thereof, or pure tantalum or alloy thereof; and when the stent is applied to peripheral blood vessel, the auxiliary wire is cobalt-chromium alloy or stainless steel or tungsten or tantalum. The stent, when serving as a thrombus removal system for treating cerebral apoplexy, not only can be used for removing thrombus effectively for several times but also can be used for catching small thrombus flowing to distal end so as to prevent distal blood vessels from getting blocked; and the stent can be used for dilating stenosis or blocked brain blood vessel or peripheral blood vessel, so as to take an effect of dredging and reconstructing a blood flow. The stent can be repositioned and released, with high controllability; and the stent can be used for reducing operation difficulty and greatly improving an operation success rate.

The invention provides an anastomat for gastrointestinal tract anastomosis surgery and a production method thereof. The anastomat comprises an anastomosis nail and a base and is divided into two types, namely a combined type and an independent type. The anastomat is composed of degradable materials and medical barium sulfate and can be finally disintegrated to be powder to be removed from the body after being used up. An envelope is formed on the outer surface of the anastomat through polyacrylic resin and contains medicines such as sulfonamides and quinolones antisepsis and anti-inflammation medicines and adrenobazonum, dicynone and other hemostasis medicines, and the envelope can selectively perform medicine slow release and controlled release according to different pH physiological environments of gastrointestinal tracts.

The invention discloses a robot device for minimally-invasive local radiotherapy. The robot device comprises an end executing mechanism which is used for realizing autorotation and accurate feeding adjustment of an ultrasonic probe and provided with a particle punching mechanism, a horizontal rotation and pitching adjustment mechanism which is arranged below the end executing mechanism and used for supporting the end executing mechanism and realizing the horizontal rotation adjustment and pitching adjustment of the end executing mechanism, and a support adjustment mechanism which is arranged below the horizontal rotation and pitching adjustment mechanism and used for supporting the horizontal rotation and pitching adjustment mechanism and realizing the adjustments of front and back positions, left and right positions, upper and lower lifting positions of the end executing mechanism. The robot device for minimally-invasive local radiotherapy has the following advantages of: assisting doctors in finishing short-distance radioactive therapy of prostatic cancer under ultrasonic image navigation, having high precision, high stability and convenience for operations, reducing pain of patients, reducing operation time, improving operation precision during the surgery, preventing misoperation of the doctors, reducing trauma of the patients, reducing labor intensity of the doctors, and improving success rate of the surgery.

The invention discloses a cervical pedicle screw alignment apparatus. The apparatus comprises a spinous process clamp and a connecting rod fixedly arranged on the spinous process clamp; the other end of the connecting rod is provided with a connecting plate; an angle adjusting rod is hinged on the connecting plate; a guide rod is inserted into the angle adjusting rod; the angle adjusting rod is also connected with a locking angle adjusting rod and a locking device for the guide rod; the guide rod is connected with an open-circuit conical cylinder into which an open-circuit cone is inserted; and the angle adjusting rod is also provided with an annular table and a sleeve gasket sleeved on the annular table, the sleeve gasket is axially and glidingly connected with the annular table, and the lateral surface of the sleeve gasket is provided with angle marking lines. The cervical pedicle screw alignment apparatus has the advantages of simple structure and convenient operation, can accurately position a pedicle screw implanting angle, and greatly improves the success rate of operation.

The invention discloses a three-dimensional positioning and guiding device for penetrating a vertebral pedicle through skin. The three-dimensional positioning and guiding device for penetrating the vertebral pedicle through the skin comprises a base, dip angle measuring devices and a measuring device supporting rod, wherein guiding grooves are arranged in length wise frame edges of the base, two dip angle measuring devices are matched on the measuring device supporting rod in a sliding mode, and an arc-shaped guiding groove is arranged in each dip angle measuring device. A bar-shaped hole is arranged in the measuring device supporting rod, a puncture needle guiding tube is in hinge joint with the dip angle measuring devices, and the puncture needle guiding tube penetrates through the bar-shaped hole. A guiding pin is arranged on the puncture needle guiding tube and is matched with the arc-shaped guiding grooves, marking needle fixing holes are arranged in the middle portion of the measuring device supporting rod, and two ends of the measuring device supporting rod are cylindrical segments. The measuring device supporting rod is matched with the guiding grooves in a sliding mode through sliding blocks, the cylindrical segments of the measuring device supporting rod extend out of the sliding blocks and are connected with a positioning rod, and the positioning rod is in the same plane with the measuring device supporting rod and the puncture needle guiding tube. The three-dimensional positioning and guiding device for penetrating the vertebral pedicle through the skin is capable of three-dimensional positioning and guiding and shortening the operation time, high in efficiency, accurate in guiding and capable of improving the achievement ratio of operation.

The invention discloses an analogue operation training system, and belongs to the field of cross-over studies coalescing a plurality of subjects such as an information technology, an automation technology and a machinery manufacturing technology. The analogue operation training system can be used for operation path planning before an operation and the daily operation training of a physician. Analogue operation software is developed, a brain model can be established according to magnetic resonance imaging (MRI) data, and a virtual operation can be performed based on the brain model in a computer virtual space; an operation operator is designed, and has six degrees of freedom, and the operating principle for the operation operator is the same as that of a ventriculoscope operating knife, so that real sense of operation is ensured; a field programmable gate array (FPGA)-based multi-path data acquisition system is designed, and can be used for acquiring six paths of coder data in real time, so that the system is high in real-time performance; and the system is high in brain model accuracy, real-time tracking performance, operation realism and automation degree and low in development cost.

The invention relates to a multifunctional electric delivery bed, which comprises a lifting base, a lifting table, a foot-operated control table, a cushion plate and a back plate, wherein the back plate is articulated and installed on the lifting table; the cushion plate is articulated on the lifting table, the other end of a transverse connecting rod of which one end is articulated with the end part of a supporting plate of the cushion plate is articulated with one end shaft of a crank shaft installed on the lifting table, and the other end of a push rod which is articulated with the other end shaft of the crank shaft is fixedly connected with the output shaft of a motor articulated on the lifting table; an expansion plate of which one end part is provided with a plurality of through holes is installed at each of the two sides of the lifting table in a clearance fit mode, and a curved rod which is in screwed connection with a foot plate passes through a through hole on a connecting sleeve and is fixed by a fastening screw which passes through the side wall of the through hole; and one end of a screw rod is inserted into the through holes of the expansion plates, and the other end of the screw rod passes through a screw nut which is in screwed connection with a hollow sleeve of the outer side wall of the lifting table and is exposed. Various factors are comprehensively considered when the delivery bed provided by the invention is designed, and the delivery bed has the advantages of humanized design, comfortable use, high safety performance and simple and easy adjustment.

Provided are a method and an apparatus for providing a guide image for image guided surgery, which is used so as for a doctor to perform accurate surgery, which an determine a position of a surgical tool for a surgery target region of a patient by calculating a position of a laparoscope / endoscope view and the position of the surgical tool for the surgery target region, based on a distance image calculated from a binocular image of a laparoscope / endoscope, prediction of a positional change of a body type / organ by gas injection based on a prior diagnosis image based on CT / MRI, recognition of a posture of the patient and a position of an abdomen through a 3D scanner, recognition of a position / angle of the surgical tool through a surgical tool sensor, and the like.

The invention belongs to the field of biomedical materials, and particularly relates to a biomedical material with good antibacterial, hemostatic and osteogenic activities and a porous calcium phosphate-chitosan composite coating, and a preparation method thereof. The preparation method comprises the following steps of: firstly, preparing a porous calcium phosphate coating by using plasma spraying; and secondly, directly compounding a water-soluble chitosan surface layer on the surface of the porous coating by a soaking method, a dropping method and the like. Thus, the prepared biomedical material not only can play a good role in resisting bacteria and stopping bleeding in early days after an operation, but also can minimize potential adverse effects of surface bioactivity and osteogenic performance of an implant. The biomedical material has a simple process and a low production cost, can endow an implantation appliance with two additional effects of stopping bleeding and stopping bleeding, can greatly improve the safety and the success rate of the existing implantation appliance, and alleviating pains of patients.

The embodiment of the invention discloses a bracket conveying system which comprises a handle, a connecting device, a far-end outer pipe, a safe lock and a central shaft, wherein the handle, the connecting device and the far-end outer pipe are connected in sequence; the central shaft is arranged in the pipe cavities of the far-end outer pipe and the connecting device and penetrate through the handle; the central shaft is used for fixing and supporting a covered stent; the handle comprises a fixing handle and a rotating handle; the fixing handle is connected to the front end of the rotating handle in a sleeving manner; the rotating handle rotates relative to the fixing handle to drive the connecting device and the far-end outer pipe to travel; the safe lock is connected with the fixing handle. According to the bracket conveying system provided by the embodiment of the invention, the covered stent which is conveyed can be accurately released at a focal infection to move backwards independently in the blood vessel through the far-end outer pipe, and can be quickly released, the risk of rupture of blood vessel or aneurysms due to long time occlusion of blood flow by the covered stent can be avoided.

The invention relates to a device for regulating a nail cabin direction of a disposable intra-cavity coinciding instrument, and belongs to an auxiliary device of a disposable intra-cavity coinciding and stitching instrument for applying linearity in cavity tissue and a surgical stitching instrument for cutting tissue among linear coinciding instrument. The instrument comprises a steering draw hook, a rear draw hook, a steering transmission plate, a rotation handle, a direction locating ring, a spring, an angular regulation plate, an angular fixing plate, a rotation shaft, an upper rotation head cover, a lower rotation head cover and a fixed guide sleeve; the upper rotation head cover and the lower rotation head cover are installed at the front end of the fixed handle; the fixed guide sleeve is arranged between the upper rotation head cover and the lower rotation head; the upper part of the upper rotation head cover is provided with an installation hole; the periphery of the installation hole is provided a fixed groove; the steering transmission plate is installed in the installation hole in the upper part of the fixed guide sleeve; the front end of the steering draw hook is connected with an upper connector and a lower connector through connecting pins; the upper connector and the lower connector are connected with a nail cabin seat and a nail prop seat; the rear end of the steering draw hook is connected with the front end of the rear draw hook; and the rear end of the rear draw hook is connected with the steering transmission plate.

The invention discloses an endoscope operating sheath for urological surgery. The endoscope operating sheath comprises a core rod which can be arranged in the endoscope operating sheath to axially slide relative to the endoscope operating sheath. The core rod is internally provided with a guide wire passage, a water injection passage and an image passage, and the guide wire passage, the water injection passage and the image passage extend from the rear end to the front end of the core rod. An endoscope handle is provided with a guide wire connector, a water injection connector and an endoscope connector for guiding a guide wire, water and an endoscope into the guide wire passage, the water injection passage and the image passage respectively. The endoscope operating sheath and the core rod enter a human body along the guide wire, the core rod is drawn out after reaching a lesion part, then a flexible cystoscope is put in the endoscope operating sheath, and the endoscope operating sheath and the flexible cystoscope are operated to observe the lesion part and cooperate with surgical instruments for performing the surgery. The method is simple and easy to operate, and the endoscope operating sheath can be widely applied to renal pelvis and renal caliceal calculi surgery to serve as a visible ureterectasia sheath and is applicable but not limited to cardiovascular intervention, gynecology department, thyroid gland and mammary gland department, neurosurgery department and orthopedics department and other unmentioned related clinical medical fields.

The invention provides a fractured end micro-movement and blood supply based fracture healing simulation system, relating to the field of biomedical engineering. The system is used for predicting a complicated process of fracture healing and exploring undetermined mechanisms in fracture healing. The system comprises a fracture healing simulation sub-system, an input module and a display module. The fracture healing simulation sub-system (1) comprises a geometry modeling module, a grid partition module, an environment initialization module, a biomechanical calculation module and a biological environment module. The biological environment module is used for creating a biochemical environment of callus in fracture healing so as to finish tissue differentiation in the callus. According to the system, blood supply is used as a dynamic variable and is introduced to the fracture healing simulation system, so that the fracture healing process can be simulated more accurately. The system can perform experiment simulation repeatedly, thereby helping to find out the best fractured end micro-movement value and the impact of blood on fracture healing.

The invention discloses an injectable self-solidifying calcium phosphate bone-repairing material and making method, which consists of solid phase and liquid phase, wherein the solid phase contains 0.2-2.0% degeneration starch, 0-15% beta-dicalcium silicate powder, 0-15% strontium and bismuth compound and 0-30% macromolecular microball or microcapsule; the liquid phase is composed of one or more composition of deionized water, diluted phosphoric acid, physiological saline, blood, soluble phosphate solution and organic acid; the rate of liquid phase and solid phase is 0.3-1.2ml / g.

The invention relates to the field of a medical model, particularly relates to a medical model based on 3D printing and a manufacturing method thereof and aims to provide a model for pre-operative simulation training. The method comprises steps that a three-dimensional digital model of target bones is constructed; a preset number of sub-models of the target bones are extracted; hole repair of a sub-model of each target bone is performed; a three-dimensional digital model of a target soft tissue / organ mold is constructed; according to the sub-models of the repaired target bones and the 3D digital model of the mold, 3D printing is performed to obtain a physical model of the target bones and the mold of the target soft tissue / organ; the physical model of the target soft tissue / organ is produced based on the mold obtained through 3D printing; the physical model of the target bones and the physical model of the target soft tissue / organ are combined to obtain a medical model. The method is advantaged in that the model simulation degree is high, effective pre-operative simulation training for medical staff can be performed;, and the success rate of surgery can be improved.

The invention discloses a respiratory motion compensation method for lung percutaneous puncture. The method comprises the following steps: constructing a four-dimensional visualization model by usingpre-operative 4DCT images; extracting a respiratory movement trajectory, selecting a target point and a skin insertion point based on the four-dimensional visualization model and respiratory movementtrajectory, forming a puncture path, and determining an initial position, direction and puncture depth of a puncture needle; and during intraoperative puncture needle insertion, acquiring respiratorysignals of a patient in real time by a respiratory monitoring device, inputting the respiratory signals into a control system of a puncture robot, and analyzing characteristic parameters of the respiratory signals by the control system to guide the puncture robot to iteratively adjust the needle insertion speed to ensure that a needle tip reaches the target point at a specified time, so as to compensate for tumor displacement caused by breathing. The method provided by the invention allows puncture to be performed in a state of free breathing, has a wider application range, and helps to reducepain of the patient and improve the success rate of surgery.

The invention relates to the technical field of medical apparatus and instruments, in particular to a novel cerebral thrombus removal device and a method for removing a thrombus by using the device. The cerebral thrombus removal device includes a stent and a transportation system connected with the near end of the stent, the stent is of a self-expansion pipe network structure formed through mutualconnection of multiple mesh units, the surface of the stent is curved in a wave shape, the stent is transported to the vascular embolism position of an intracranial great vessel through the transportation system, the stent of the pipe network structure is unfolded through self-expansion, and the thrombus is captured. The surface of the stent is arranged to be curved in a wave shape, so that the contact area of the surface of the stent and a vessel wall is small, the metal coverage is low, in the process of thrombus removal, damage to the intima of the vessel is less, friction between the thrombus and the vessel wall is reduced at the same time, and therefore the thrombus is easy to remove and maintained to be relatively integrated to prevent thrombus debris from entering the far end or anormal vessel; the thrombus can be removed fast, and the stability of thrombus removal is enhanced.

The invention relates to a covered stent conveying and far-end positioning releasing system. A stent conveying mechanism comprises a core pipe assembly composed of a liquid filling port, a core pipe and a guide head, a middle pipe assembly composed of a middle pipe and a second control handle, and a sheath pipe assembly composed of a sheath pipe and a first control handle. A stent far-end positioning releasing mechanism comprises a guide wire, a guide wire rewinding system and a guide wire pulling ring. A stent and the guide wire are bundled and compressed in a stent loading area of the stent conveying mechanism through a stent bundling line. After the stent conveying mechanism conveys the stent to the designated position, the middle pipe assembly and the core pipe assembly are mixed, the sheath pipe is retreated till the stent is completely exposed, the guide wire pulling ring is unscrewed, the guide wire is slowly pulled backwards, the guide wire is retreated through the guide wire rewinding system and moves from the far end to the near end of the stent, the guide wire and a stent bundling line winding point are disengaged in sequence along with retreating of the guide wire, the stent is automatically bounced off and released after being disengaged from the stent bundling line, finally, positioning releasing of the stent from the far end to the near end is achieved, and positioning precision is improved.

The invention provides a multi-purpose percutaneous puncturing, channel building, fistulization and drainage device which consists of a pin sheath tube, a pin core, a separable injector interface, a guide wire, multiple layers of passage expansion tubes, working sheath tubes and drainage tubes. The left end of the pin core is provided with a pin core handle; a circular groove is arranged in an internal hole of the pin core handle and is meshed with the left end of the separable injector interface and the left end of the pin sheath; the pin core is inserted in the pin sheath tube; the separable injector interface is arranged in close sliding match at the left end of the pin sheath tube and a convex ring is arranged at the right end of the pin sheath tube; the innermost layer of passage expansion tube is arranged outside the pin sheath and the left end of the tube is connected with the convex ring; the working sheath tubes are arranged outside of the outermost layer of passage expansion tube and the left end of the tube is provided with a handle; the inside diameters of the working sheath tubes are the same as the adjacent multiple layers of passage expansion tubes. Compared with the prior art, the invention can reduce operative complications, improve operative success rate, reduce the work intensity of medical staff and can be applied to minimally invasive operations for various diseases due to the good universality.

The invention discloses a spinal minimally invasive surgery navigation method and system based on augmented reality. The method comprises the following steps: reconstructing a virtual three-dimensional image of the spine of a patient; registering the virtual three-dimensional image with the patient space to obtain the position of a virtual lesion in the virtual three-dimensional image; projectinga surgical path defined in the virtual three-dimensional image into the patient space; generating a DRR image of a preoperative CT image and conducting real-time registration with an intraoperative X-ray image to determine the actual lesion point; controlling a robot to clamp a surgical instrument to perform the operation on the actual lesion point; obtaining a real surgical scene in real time during the operation, and outputting the acquired video signal on a 3D display. According to the method and system, the preoperative surgical path planning can be achieved to accurately locate the lesionpoint and achieve real-time monitoring of the operation. Real-time tracking is achieved during the operation to avoid operation errors and improve the operation success rate.

The invention relates to an automatic conveying device for an intervention catheter used for the medical operation, in particular to a conveying operation device for an intervention catheter. The conveying operation device comprises a linear pushing module, an axis-around rotation module, a push-pull module, a front-end catheter twisting-conveying module, a catheter apparatus handle and a catheter outer sleeve clamping module, wherein the linear pushing module, the axis-around rotation module and the push-pull module are used for realizing the movements such as linear pushing, axis-around rotation and catheter front-end bending of the intervention catheter in an outer sleeve; and the clamping and fixing of the outer sleeve are realized through the catheter outer sleeve clamping device. The conveying operation device can assist the surgery operating staff in developing the precise operation of the intervention catheter in the surgical operation, compared with the traditional manual operation mode, the conveying operation device has the advantages that the catheter operation precision can be improved, the labor intensity of doctors can be reduced, and the operation efficiency can be improved.

The invention discloses a femoral handle fixed through expansion. The femoral handle comprises a femoral handle upper end, a handle body connected with the femoral handle upper end and a handle head connected with the handle body. The handle body is internally provided with an inner handle hole and a screw hole communicated with inner handle hole, the inner handle hole is internally provided with a push rod, the screw hole is internally provided with a screw connected with the push rod, and one end of the screw is provided with an inner square hole. By the femoral handle which is simple in structural design and convenient and rapid to operate, the problem of troubles brought to operation due to the fact that looseness or breaking apart easily occurs to an existing femoral handle during the operation is solved, so that the operation is more successful, success rate of the operation can be improved, and the femoral handle is more practical.

The invention discloses a simulation system for long bone fracture healing based on tissue differentiation, and relates to the field of biomedical engineering. The simulation system is used for predicting the complicated process of the fracture healing and searching for the optimal scheme for the fracture healing. The system comprises a fracture area geometric modeling module, a fracture area biomechanics finite element analysis module, a callus unit tissue differentiation module and a program determination judging module. The fracture area geometric modeling module is used for establishing a three-dimensional geometric model of the fracture area; the fracture area biomechanics finite element analysis module is used for conducting finite element analysis on the established three-dimensional geometric model to obtain unit mechanical stimulation; the unit tissue differentiation module is used for simulating tissue differentiation and making the content of each tissue in the unit be updated; the program determination judging module is used for judging whether the program is determined or not. According to the simulation system for the long bone fracture healing based on the tissue differentiation, the fracture area is regarded as a diphasic porous elastic model, the fracture healing process can be more accurately simulated, and the system provides beneficial help for searching for the optimal scheme for the fracture healing.

The invention discloses a catheter of composite structure. The catheter comprises a high-molecular pipe on the outer layer, a tubular woven net or spring net on the middle layer and a smooth inner layer. The high-molecular pipe on the outer layer is made of nylon, nested polyetheramide elastomer, polyurethane or silicone rubber; the wall thickness of the far end of the woven net or spring net on the middle layer is smaller than or equal to the wall thickness of a woven net body or spring net body; the inner layer is made of polytetrafluoroethylene or high-density polyethylene or nested polyetheramide elastomer containing a friction coefficient reducing additive. Compared with a conventional plastic catheter, the composite catheter has the advantages that the same mechanical performance requirement is met, and the wall thickness can be greatly reduced; the passing performance, folding resistance and controllability of the composite catheter are greatly improved, the composite catheter can be pushed to deeper and smaller blood vessels under the same conditions, and the operative successful rate is increased.