74 results about "Femoral head prosthesis" patented technology

A femoral head prosthesis assembly and operation instruments thereof. The operation instruments include a hollow femoral neck holder with a configuration adapted to the surface configuration of the femoral neck and a shaper blade for cutting a replacement end of the femur into a predetermined configuration. A guide tube is disposed on a top face of the femoral neck holder. A transverse slot is formed on the femoral neck holder for indicating a femoral head cutting line. The femoral head prosthesis assembly includes a cap body and an artificial femoral head. A root section of the cap body has an inner surface in conformity to the surface of the femoral neck. A top section of the cap body has a cross section adapted to that of the replacement end. The cap body can be precisely securely bonded with the replacement end of the femur.

The invention discloses an acetabulum tissue model reconstruction method for a serialization hip joint CT image. The method includes the following steps of forming a fine outline, wherein the point with the maximum gradient on the vertical line of the tangent line of any point on a circular caput femoris coarse outline on a selected original CT slice is selected; traversing the caput femoris coarse outline to obtain an outline point set of the points, with the maximum gradient, on the vertical lines of all the tangent lines; connecting the points in the outline point set to form the fine outline of the caput femoris tissue of the CT slice; extracting a sequence caput femoris outline; extracting a sequence acetabulum image; conducting three-dimensional reconstruction. According to the method, personalized related position parameters are obtained on the basis of the individual hip joint bone shape of a patient, acetabulum segmentation is conducted in the CT image to obtain accurate acetabulum tissue images and a three-dimensional model, the foundation is laid for conducting personalized reverse determination modeling on an artificial caput femoris prosthesis in the subsequent process, no priori knowledge obtained by conducting training on other data sets is needed, and implementation is easy.

The invention provides a polyetheretherketone total hip femoral head prosthesis material and preparation method thereof, wherein the material comprises (by weight percentage) 10-60% of carbon fiber and balancing polyetheretherketone. When short carbon fiber is employed, the short carbon fiber and polyetheretherketone resin are weighed and premixed in high speed mixing machine, the premix is compounded, squeezed and granulated with a double bolt extrusion machine. When continuous carbon fiber is employed, orthogonal reinforced carbon fiber tang and polyetheretherketone resin are weighed for laminating, then placed into parallel board die arrangement for compression moulding.

An implant is provided for replacing the proximal portion of a femur having a substantially intact natural femoral neck and a lateral side opposite the femoral neck, with a bore extending from the femoral neck through a lateral side of the femur. The implant comprises a sleeve having a flange for engaging a proximally facing resected surface of the neck surrounding the bore in the femur and having a bore with an inwardly tapered conical portion. A shaft member having a longitudinal axis, a distal end, and a proximal end is placed in the bore through the femur. The shaft member has an intermediate conically tapered male portion for coupling to the conically tapered bore of the sleeve and a proximal end having a conically tapered portion. A head member having a distal end and a proximal substantially-spherical portion and a tapered recess is configured for positioning in a natural or prosthetic hip socket.

The invention discloses a full coax femoral head prosthetic appliance and its making process, wherein the prosthetic appliance comprises an inner layer and an outer layer, the inner layer being an uninterrupted carbon fiber reinforced polyetheretherketone composite material layer, the outer layer being a short cut carbon fiber reinforced polyetheretherketone composite material layer, and a core rod die arrangement and a prosthesis die arrangement are utilized to realize thermal compression bonding of the two composite material layers. The invention also discloses the process for making the prosthetic appliance.

A method and system for acquiring the attitudes of an acetabulum and a femoral head in real time during an artificial hip joint replacement procedure; during hip joint replacement, a pressure sensor and / or a touch sensor are disposed at each pressure point concerned for a femoral head prosthesis test mould, forming a sensor array (1); the sensor array (1) acquires the contact and stress conditions between the femoral head prosthesis test mould and the acetabulum, and sends out a signal; and a receiving terminal receives and displays the signal on a display module, and acquires the simulated attitudes of the acetabulum and the femoral head. The system comprises a sensor array (1), a necessary peripheral circuit, and a signal receiving and display device for receiving and displaying the signal sent by the peripheral circuit. The present invention can accurately simulate the presented attitude of the femoral head prosthesis during hip joint replacement procedure, so that a doctor can intuitively see the position and movement condition of the femoral head prosthesis during the procedure, thus improving the success rate and curative effect of the hip joint replacement procedure.

Orthopedic procedures, such as total hip replacement and / or other surgical procedures, involve the retraction and distraction of bone and tissue in order to reduce prosthesis components, such as a femoral head prosthesis, into place during surgery and to perform other surgical techniques, such as reaming of the acetabulum. An instrument handle that allows for enhanced control of surgical instruments and other tools that involve the application of directional force includes a grip, an extension arm and a support brace that is configured to contact a user's forearm during a surgical procedure. A multiple-tool receptor may also be included that allows for the removable and interchangeable use of tools in connection with the instrument handle. The system described herein allows for deep distraction without angulation using larger muscles or even one's body.

The invention relates to the field of medical apparatus and instruments, in particular to a non-metal ball hip joint prosthesis.The non-metal ball hip joint prosthesis comprises an acetabulum cup prosthesis body, a non-metal femoral head prosthesis body and a femoral stem prosthesis body.According to the non-metal ball hip joint prosthesis, an original acetabulum cup and liner are changed into a metal cup, and meanwhile a traditional metal or ceramic ball is changed into a high-crosslinking polyethylene ball with a metal core.On the premise that compatibility of the original metal-polyethylene joint surface is maintained, the thickness of the acetabulum cup is greatly decreased, and the large-diameter ball can be used when the small-diameter joint cup is available.Connection among components is reduced, meanwhile, the wear probabilit is greatly lowered, and the defects that a traditional complete hip joint prosthesis is small in movement angle, prone to dislocation and high in acetabulum side bone removal amount are overcome.

The invention relates to a carbonaceous caput femoris false body inserted with a metal inner housing. The false body is composed of carbonaceous caput femoris, and is characterized in that the metal inner housing is firmly fixed in a fixed slot of the carbonaceous caput femoris. The invention can lead the carbonaceous caput femoris with different specifications to being matched with a universal false body handle, the operation difficulty is decreased, the error caused by an artificial factor is avoided, the operation time is shorten obviously, and the invention can lead the carbonaceous caput femoris to be popularized and applied widely. The matching precision of the metal inner housing and the false body handle is high, the mechanical strength is high, the stable non-deformation can be kept permanently, the stability of the false body in a medullary cavity is improved, and the compression resistant capacity is improved more than one time compared with the prior false body. The invention not only is in favor of the operation of a orthopaedic surgeon, but also can lead the carbonaceous caput femoris to be matched with various biological type and non-biological type false body handles with different specifications corresponding to the patient individual, the long term and anxious individualization choice of a medical worker is realized. The invention has use value, and can generate better social efficiency and economic efficiency after being popularized and applied.

The invention reduces friction and wear in partial hip prosthesis by combining optimized geometry of the articulation and surface treatment of the prosthetic component. The acetabulum is reamed to the bone. One of the articulating surfaces—either that of the reamed acetabulum, or that of the femoral head prosthesis is a-spherical so that a fluid-filled gap is formed at the area of major load transfer. The fluid-filled gap is sealed by an annular area of contact, over which the concave and the convex components are congruent. The preferred surface treatment is by diamond-like coating, which results in very low coefficient of friction and high abrasion resistance against the bone. The prosthetic head is fixed to the femur by either a conventional stem, a perforated shell, or a femoral neck prosthesis screwed onto the femur so that it is partially covered by bone and partially exposed on the medial-inferior aspect, where it abuts the reamed cortex of the calcar region.

The invention discloses a method and a system for acquiring posture of an acetabular bone and a femoral head in novel hip arthroplasty. The method comprises the following steps of: setting pressure sensors and / or touch sensors and an image sensor on a femoral head false test mould to form a sensor array; acquiring the contact and stress condition and position information of the femoral head false test mould and acetabular bone by the sensor array, and sending a signal; and receiving the signal by a receiving end, and displaying the received signal on a display module, so as to acquire the analogue postures of the acetabular bone and the femoral head. The system comprises the sensor array, a necessary external circuit and a signal receiving and displaying device for receiving and displaying the signal emitted by the external circuit. According to the invention, the existing posture of the femoral head false body can be accurately simulated during the hip arthroplasty, so that a doctor can intuitively see the position and movement status of the femoral head false body during the hip arthroplasty, and further, the success rate and the surgical treatment of the hip arthroplasty can be greatly improved.

The invention relates to an artificial acetabular cup. The artificial acetabular cup which is a single-type artificial acetabular cup is in a concave semicircle shape and comprises an outer layer and an inner layer, and the outer layer and the inner layer are both composed of PEEK or derivatives of PEEK and are fixed into a whole. The invention further relates to an artificial acetabular cup which can be combined with an acetabular cup lining. The artificial acetabular cup can be used independently or form a combined acetabular cup to be used, so that selectivity is high. When the artificial acetabular cup forms the combined acetabular cup, the combination of the inner layer of the artificial acetabular cup and the acetabular cup lining can reduce stress concentration, and therefore the risks of fretting wear and lining damage are reduced, or a friction pair is directly formed by the acetabular cup and the outer surface of a femoral prosthesis. The PEEK inner layer of the artificial acetabular cup has the advantages of being resistant to corrosion and fretting wear, and therefore release of metal ions and particulates harming the human body can be avoided.

The invention concerns a device for testing, in a destructive or non-destructive manner, femoral head prosthesis having a blind hole for receiving the end of a femoral prosthesis rod. The device includes a frame provided with a shaft projecting from the frame, said shaft having a substantially complementary shape to said bore and being associated with means for applying a pressure onto the inner bore wall when a femoral head is fitted onto said shaft.This device is characterised in that the shaft includes a sealed jacket having at least one deformable lateral wall portion, and a socket fitted onto said jacket and provided with elastic fingers that extend substantially facing said deformable wall portion of the jacket, and in that said jacket defines an inner chamber in communication with means supplying a pressurized fluid, such that the fluid pressure is transmitted to the inner bore wall via the deformable wall and the elastic fingers.

The invention provides a hip joint prosthesis part. The hip joint prosthesis part comprises femoral head prosthesis part and an acetabular cup prosthesis part, wherein the femoral head prosthesis part comprises a first porous layer, a first metal entity layer arranged on one side of the first porous layer and a first cladding layer formed between the first porous layer and the first metal entity layer through the first cladding technology, and a first smooth surface is formed on the surface, away from the first cladding layer, of the first metal entity layer; the acetabular cup prosthesis part comprises a second porous layer, a second metal entity layer arranged on one side of the second porous layer and a second cladding layer formed between the second porous layer and the second metal entity layer through the second cladding technology, a second smooth surface is formed on the surface, away from the second cladding layer, of the second metal entity layer, and the first smooth surface is matched with the second smooth surface. By the hip joint prosthesis part, the problem that an existing hip joint prosthesis part cannot have both good bone fusion performance and good friction performance at the same time in the prior art can be solved effectively.

The invention relates to an artificial hip joint with an aspherical acetabulum, comprising a non-spherical bearing curved-surface acetabulum prosthesis and a spherical femoral head prosthesis, wherein the non-spherical bearing curved-surface acetabulum prosthesis comprises an acetabulum external surface, an acetabulum cup opening plane is respectively connected with the acetabulum external surface and an acetabulum bearing curved surface, and the acetabulum bearing curved surface is an rotational ellipsoid curved surface obtained by rotating a long axis as a rotation axis by using a center line direction of left and right femoral heads as a long-axis direction and the up-and-down direction as a short-axis direction. When the two prostheses are in micro deviation in the walking process of a human body or the placement position of an acetabulum is improper during operation, the edge contact can be avoided; and compared with the traditional spherical joint, by adopting the artificial hip joint with the aspherical acetabulum, obtained by utilizing a finite element for calculation, contact stress can be reduced by 78.45% to the maximal degree, and although the contact stress is increased when micro separation is not generated, the increased range is not large. The artificial hip joint with the aspherical acetabulum reduces the contact stress, especially the contact stress of an external upper edge so that the abrasion of the external upper edge is further reduced so as to prolong the service life of the prostheses, and has the advantage of long service life.

The invention relates to the field of medical apparatuses, and discloses a surface hip endoprosthesis. The surface hip endoprosthesis comprises a caput femoris prosthesis, wherein the caput femoris prosthesis comprises a caput femoris part sleeving the external surface of the caput femoris of a human body and a fixing part connected with the caput femoris part and transplanted into the caput femoris of the human body; a first rotating preventing groove is formed in an inner surface in cooperating with the outer surface of the caput femoris of the human body, of the caput femoris part, and / or asecond rotating preventing groove is formed in the outer surface of the fixing part. The surface hip endoprosthesis can guarantee the self joint function and stability under the condition of long-term use.

The invention discloses a preparation method of a medical femoral head prosthesis dense alumina ceramic material with compact microstructure and excellent mechanical properties. The present invention optimizes the raw material of alumina powder, and adopts the chemical coprecipitation method to separate the Mg(NO 3 ) 2 ·6H 2 O, ZrOCl 2 ·8H 2 O and YCl 3 The three mixed substances are evenly coated on the particle surface of alumina powder; the Mg(NO 3 ) 2 ·6H 2 O, ZrOCl 2 ·8H 2 O and YCl 3 generate MgO, ZrO and Y, respectively 2 o 3 ; Aluminum oxide powder is molded into a body by cold isostatic pressing; low-temperature pre-sintering is used to prepare alumina ceramics with low hardness; high-temperature re-sintering is used to prepare dense alumina ceramics with excellent mechanical properties.

The invention provides a fusion femoral stem system. The system comprises a bent short handle, a fixing mechanism and a femur head prosthesis, and a conical connection body is arranged at one end of the bent short handle; the conical connection body is connected with a conical connection hole of the femur head prosthesis in a matched mode, the other end of the bent short handle is inserted into and extends into the medullary cavity below the lesser trochanter from the bone cutting surface of the femoral neck, and the bent short handle is fixedly connected with the greater trochanter through the fixing mechanism. The fusion femoral stem system has the advantages that after the whole system operation and the sclerotin on the periphery of the bone bed at the near end of the host thighbone completes ingrowth osseointegration, the applied mechanics influence of the remained femoral neck and the sclerotin close to the lesser trochanter and the greater trochanter is basically close to a pre-operation biomechanics state.

A prosthesis component 2 is disclosed, the component comprising a shell (2) formed form a carbon fibre reinforced polymer material and having an inner bearing surface (10); and a liner (6) formed from a ceramic material and having an outer bearing surface(12); wherein the liner (6) is received in an articulating manner within the shell (4). A hip replacement prosthesis is also disclosed, the hip replacement prosthesis comprising a prosthesis component (2) as disclosed and a femoral head prosthesis component (24), the femoral head prosthesis component being formed from a ceramic material.

An orthopedic cutting tool for reshaping the end of a femur is described. The cutting tool comprises three separate cutting blades that are positioned within different locations within a housing to reshape the end of the femur to thus receive a femur head prosthetic. The cutting tool forms the reshaped femur end in one cutting motion.

The invention discloses a femoral head prosthesis. The femoral head prosthesis is implanted and fixed on the femoral head in the body of a patient; a plurality of lugs (2) are arranged on the side surface of the femoral head prosthesis (1); the lugs (2) can be inserted into the femoral head to fix the femoral head prosthesis (1); bone trabeculas (4) are arranged on the two sides of the lugs (2) and in contact with the femoral head; the surfaces of the bone trabeculas are rough surfaces so that the femoral head prosthesis can be fixed in the femoral head. The femoral head prosthesis is used for overcoming the current situation that the whole hip joint needs to be replaced for the existing femoral head necrosis and no femoral stem and whole acetabulum are needed; for the femoral head necrosis due to pathological changes, the necrotic femoral head part is just cut off and replaced, and the good femoral head is retained; as a result, the problem of stability at later stage of a young patient due to large bone cut-off amount; the femoral head prosthesis is wider in application range for patients; the prosthesis can be implanted more conveniently, the wound area is small, and a good bone ingrowth property is achieved; besides, the curative effect at later stage is more remarkable.

The invention relates to an equal length measuring device for hip joint replacement, belonging to the technical field of orthopaedic medical instruments. The device is used for measuring the replacement length when hip joint replacement is implemented. The technical scheme is as follows: a positioning screw and a positioning block of the device are fixedly arranged on the thighbone, the lower end of a guide bar is connected with the positioning block in a fastening manner, a measuring slide block slides on the guide bar, a measuring pointer moves up and down along with the measuring slide block and determines the dissection position of the hip joint before operation, and the position of the hip joint prosthesis after replacement is determined according to the indicating position of the measuring pointer after operation, so that the thighbone prosthesis after replacement mains the original length and ensures that the limbs after operation are equal in length. The device provided by the invention is simple in structure and convenient to use, fundamentally solves the positioning problem of hip joint replacement, avoids the condition that the limbs of patients after operation are not equal in length, and becomes an important apparatus for orthopaedic hip joint replacement which obtains an ideal effect. The device provided by the invention fills the blank in orthopaedic hip joint replacement and has huge popularization and using values.

The invention provides an acetabulum prosthesis and an artificial hip joint, and relates to the field of medical apparatuses. The acetabulum prosthesis comprises a ceramic acetabulum main body, wherein a surgical mounting hole is formed in the ceramic acetabulum main body; the surgical mounting holes runs through the outer spherical surface of the ceramic acetabulum main body to the inner spherical surface of the ceramic acetabulum main body; and surgical assistant tools are arranged in the surgical mounting hole. The artificial hip joint comprises an artificial fossa acetabuli, a ceramic femoral head prosthesis and the acetabulum prosthesis; the inner spherical surface of the ceramic acetabulum main body makes into contact with the ceramic femoral head prosthesis; and the outer sphericalsurface of the ceramic acetabulum main body makes into contact with the artificial fossa acetabuli. According to the acetabulum prosthesis and the artificial hip joint provided by the invention, technical problems of the prior art that a structure of combining a metal acetabular cup to a ceramic lining can get broken easily and is relatively low in safety can be solved.

The invention provides an artificial whole hip joint prosthesis having an axial limiting and anti-dislocation structure. The artificial whole hip joint prosthesis comprises an acetabular prosthesis, an inner liner and a caput femoris prosthesis. The inner liner is arranged in a groove of the acetabular prosthesis, and the caput femoris prosthesis is arranged in a groove of the inner liner. The artificial whole hip joint prosthesis further comprises an axial limiting and anti-dislocation structure, the axial limiting and anti-dislocation structure penetrates the central portions of the acetabular prosthesis, the inner liner and the caput femoris prosthesis to connecting the acetabular prosthesis, the inner liner and the caput femoris prosthesis together to form a whole body, and the length and the elasticity of the whole body can be adjusted. The artificial whole hip joint prosthesis having the axial limiting and anti-dislocation structure can prevent the caput femoris prosthesis from coming out of the acetabular prosthesis through an axial drawing effect, complication, generated after total hip replacement arthroplasty, of dislocation of a hip joint can be reduced even eliminated, the activity of a postoperative hip joint can be improved, and limit on postoperative patient's daily movement is less. The artificial whole hip joint prosthesis having the axial limiting and anti-dislocation structure is simple in structure designe, convenient to operate and easy to dismount, and the artificial whole hip joint prosthesis can be conveniently taken out when the artificial whole hip joint prosthesis loosens or is overhauled.

A femoral head prosthesis (110) comprises an articulating surface (112) which is more than hemi-spherical; an internal recess (114) having a longitudinal axis defining a pole P of the articulating surface (112), the longitudinal axis passing through the center of curvature of the articulating surface (112); a first edge (116) which constitutes a posterior edge in use, and a second edge (118) which constitutes an anterior edge and / or an antero-inferior edge in use. The first edge (116) is further from the pole P than the second edge (118). Also provided is a femoral prosthesis comprising a femoral head, and a femoral implant comprising a femoral stem and a femoral head. The prostheses and implants of the invention find use in total hip replacements.

The invention provides a caput femoris prosthesis impactor extractor. The impactor extractor comprises a force application unit, a force transfer unit and a fixing unit for fixing a caput femoris prosthesis. The force application unit comprises a first force application piece and a second force application piece. The first force application piece is stressed and can impact the second force application piece, and the second force application piece is connected to one end of the force transfer unit; the fixing unit comprises a containing piece capable of containing the caput femoris prosthesis and a fixing piece for fixing the caput femoris prosthesis, and the containing piece and the fixing piece are both connected with the force transfer unit. According to the caput femoris prosthesis impactor extractor, stable and small force is applied to the caput femoris prosthesis in the perpendicular direction so that the caput femoris prosthesis can be disengaged from a femoral stem, and the influence caused by the caput femoris prosthesis on the femoral stem is greatly lowered; force generated when the first force application piece impacts the second force application piece can be convertedinto acting force for vibrating the caput femoris prosthesis, and the effect of loosening the caput femoris prosthesis is achieved, in addition, force stressed by the caput femoris prosthesis is uniform, and the caput femoris prosthesis extracting efficiency is greatly improved.

The invention discloses a prosthesis registering device which is used for registering and entering all types of hip joint prostheses in a surgical navigation system. The prosthesis registering device comprises a base and a femoral stem prosthesis holder or a mortar cup prosthesis holder matched with the base, wherein the base comprises a rear seat for containing a femoral stem prosthesis, a curved arm part for containing a femoral head prosthesis and a femoral neck prosthesis, and a clamping part which is connected between the rear seat and the curved arm part and is used for fixedly clamping the femoral stem prosthesis; and at least three optical reflection spheres which are not positioned on the same straight line are respectively arranged on the femoral stem prosthesis holder, the mortar cup prosthesis holder and the base. The invention can enable all types of hip joint prostheses to be entered and registered into a computer-aided navigation system in real time, and has wide application range, simple structure and simple and convenient operation.