47 results about "Acetabular liner" patented technology

An orthopedic component having multiple layers that are selected to provide an overall modulus that is substantially lower than the modulus of known orthopedic components to more closely approximate the modulus of the bone into which the orthopedic component is implanted. In one exemplary embodiment, the orthopedic component is an acetabular shell. For example, the acetabular shell may include an outer layer configured for securement to the natural acetabulum of a patient and an inner layer configured to receive an acetabular liner. The head of a femoral prosthesis articulates against the acetabular liner to replicate the function of a natural hip joint. Alternatively, the inner layer of the acetabular shell may act as an integral acetabular liner against which the head of the femoral prosthesis articulates.

An extraction device for removing a liner from an acetabular cup is provided. The extraction device includes a body and an actuator. The actuator is operably connected to the body. The extraction device also includes a jaw for cooperation with the liner. The jaw includes a portion of the jaw for penetrating into the liner. The jaw is operably connected to the actuator. The actuator is adapted to cooperate with the jaw to provide a first position for the jaw spaced from the liner and a second position for the jaw in contact with the liner.

A hand held instrument for inserting an acetabular liner into acetabular cup is provided. The instrument includes a bulb syringe, a shaft and a head configured to sealingly engage an acetabular liner to create a sealed area between the acetabular liner and the head. The bulb syringe is used to create a vacuum in the sealed area and/or to force air into the sealed area. After the acetabular liner is placed into an acetabular cup, the vacuum is released and/or air is forced into the sealed area to force the acetabular liner off of the head.

An extraction device for removing a liner from an acetabular cup is provided. The extraction device includes a jaw and a handle. The jaw is for cooperation with the liner and including a portion of the jaw for penetrating into the liner. The handle is operably associated with the jaw and is adapted for gripping the extraction device.

Disclosed therein is a big femoral head and femoral head surface replacement, which are used for hip osteoarthritis and vascular necrosis of femoral head. As a person get older and aged, the weight bearing hip joint is indispensably changed to osteoarthritis and sometimes showed avascular necrosis of the femoral head with unknown etiology. The deformed femoral head and hip joint should be replaced with the THA. Till now, the total hip replacement is performed in such a way that the necrosed femoral head and a healthy femoral neck are all removed and a femoral stem is inserted into the marrow cavity, and in this case, a small femoral head causes a reduction of a range of motion and dislocation of the hip joint occasionally, and osteolysis due to abrasion of plastic acetabular liner. In case of a conventional femoral head surface replacement (hereinafter, called “conventional FHSR”), a complication of femoral neck fracture and could not combined use with conventional THA. Recently, hard bearing system such as metal on metal THA or ceramic on ceramic THA without using plastic has been introduced to solve the problem of osteolysis due to abraded plastic particles generated when the THA is worn out as time goes. But there also have many problems as a limited range of motion, resected normal femoral neck and difficulties of rereplacement of the femoral stem. Because of the big femoral head or the FHSR can increase the range of motion and lower dislocation rate these devices are gradually widespread in young active person and Asian peoples. This invented design of the modularity gives the convenience to the surgeon and economically lower burden to patients to use of the FHSR and big femoral head system. The related accessory showed initial stability of the FHSR during operation and prevent from femoral neck fracture in follow-up periods.

A dual mobility femoral head construct has a secure acetabular shell received within an acetabular recess formed in a pelvis. An implantable prosthetic device is implantable after a failure of an originally installed articular head insert of an acetabular cup assembly. A hemispherical liner is formed from a cast cobalt-chromium alloy for thinness and elasticity. At least three spacers are annularly displaced about an outer diameter of the hemispherical liner to define a uniform cement thickness with the secure acetabular shell. Web shaped depressions are formed circumferentially in the outer diameter of the hemispherical liner to receive cement to resist lever out forces and to secure the cement bond with the secure acetabular shell. A replacement articular head insert is then received for dual mobility rotational movement in an inner diameter of the hemispherical liner. A femoral head implant is received for articulating movement in the articular head insert.

Liner, preferably made of polyethylene, specifically designed for re-cementation into an existing ace tabular shell. Whereas existing polyethylene liners have not been designed to be re-cemented, this invention includes various features, particularly on the posterior aspect of the liner, to resist pull-out, minimize rotational torsion, and to ensure proper cement mantle thickness. In the preferred embodiment, the polyethylene liner is disposed within a shell such that the cement locks into features provided on the posterior aspect of the liner which remains in contact with cement. Liners according to the invention further preferably include an extended rim to improve cement pressurization, as well as features to resist torsion as well as pullout, and spacers to ensure proper cement mantle thickness

The invention belongs to the technical field of medical devices and discloses an acetabular prosthesis of an artificial hip joint with a rotational ellipsoid joint interface, which comprises an acetabular outer cup made of a cobalt/chrome/molybdenum alloy and an acetabular liner made of polyethylene. The liner of the acetabular prosthesis comprises a spherical outer surface and a rotational ellipsoid inner surface, wherein the radius of the spherical outer surface, i.e. the outside diameter of the liner, is equal to the subtraction of the thickness of the acetabular outer cup from the radius of the acetabular prosthesis outer cup; the length of the major axis of the rotational ellipsoid inner surface is equal to the subtraction of the thickness of the liner from the outside diameter of the liner; and the length of the minor axis of the rotational ellipsoid inner surface is equal to the multiplication of the length of the major axis by 0.98. A positioning groove and a clamping ring arearranged between the liner and the outer cup to achieve the effect of fixation. According to the shapes of acetabular fossa of different patients, the acetabular prostheses of different specifications are designed and manufactured so as to solve the problem of stress concentration on the joint interface of the spherical artificial hip joint in the prior art and meet the needs for individual treatment of different patients. Therefore, the acetabular prosthesis provided by the invention is truly put into effect in clinics.

The invention provides a hip joint prosthesis and solves the problems that parts of fastening nails of bone grafts in periacetabular osteotomy interfere with a hip joint prosthesis to cause fixing inconvenience of the bone grafts or the hip joint prosthesis and further to cause the impossibility of reaching an optimum fixing position in the prior art and that an existing total hip femoral prosthesis is not applicable to all DDH (Developmental Dysplasia Of The Hip) patients. The hip joint prosthesis comprises an acetabular cup for fixing inside an acetabulum, an eccentric acetabular liner for increasing the range of motion of the hip joint prosthesis and arranged inside the acetabular cup, a ball heat playing the role of a femoral head and arranged inside the eccentric acetabular liner and a stable femoral stem for being fixed onto a cuboid and connected with the ball head. By means of the above technical scheme, the hip joint prosthesis can be arranged in the optimum fixing position and meets the requirements on prostheses required by operations of the DDH patients.

A prosthesis has prosthetic components principally comprising metallic materials, in which a portion of an articular interface between respective components is a metallic-nonmetallic interface. At least a portion of the articular surface of a femoral head may include a ceramic material defining an articulation zone, such as at a polar region of the femoral head, so that the ceramic articulates with a metallic acetabular liner. The area covered by the ceramic may be engineered to optimize the contact conditions between the femoral head and the acetabular liner, such as by providing two clearances therebetween. A relatively smaller, polar articulation clearance is defined by the gap between the ceramic coating and the metallic acetabular liner. A relatively larger, equatorial non-articulation clearance between the femoral head and the acetabular liner is defined by the gap between the portion of the femoral head not covered by the ceramic coating.

The invention provides a biological-fixation acetabular prosthesis with the adjustable angle. The biological-fixation acetabular prosthesis comprises an outer acetabular cup and an acetabular lining, wherein an angle adjusting groove is formed in the inner edge of the bottom end of the outer acetabular cup, a prosthesis implantation device groove and a fixing threaded hole are formed in the top end of the outer acetabular cup, inverse-pyramid protrusions are formed in the outer surface of the bottom end of the outer acetabular cup, and three universal screw concave holes matched with screws are further formed in the outer acetabular cup; cylindrical protrusions matched with the angle adjusting groove in the inner edge of the outer acetabular cup are formed in the outer surface of the bottom end of the acetabular lining; after the outer acetabular cup and the acetabular lining are accurately subjected to angle adjustment to be fixedly connected in an interference-pressing-fit mode, abrasion of the acetabular lining is effectively reduced, and the stability and the safety after the acetabular prosthesis is implanted are guaranteed.

The invention relates to an artificial hip joint acetabulum outside liner, which comprises a liner body and an inner three-dimensional net body integrally formed with the inner surface of the liner body, wherein the surface of the inner three-dimensional net body is provided with a plurality of inner holes from the outside to the inside, and the inside of the inner three-dimensional net body is provided with a communication part or a transverse pore canal of all inner holes. In surgery, bone cement is filled in the inner surface of the acetabulum outside liner. The liquid bone cement permeates and fills the inner holes and the transverse pore canal of the inner three-dimensional net body of the acetabulum outside liner, an acetabulum inside liner is placed in and bonded with the acetabulum outside liner before the curing of the bone cement, and the inner three-dimensional net body, the acetabulum inside liner and the bone cement are bonded firmly into a whole after the bone cement cures completely, thereby effectively preventing forward looseness from occurring between the acetabulum outside liner and the acetabulum inside liner.

An acetabular liner insertion guide (10) aligns a liner (12) within an acetabular shell. The liner includes a ring (16) and a penetrable layer (14). The ring includes a lip configured to rest on an upper surface of the acetabular shell. The ring is also configured to attach to the liner such that an upper surface of the liner is in a plane that is generally parallel to a plane that includes the upper surface of the acetabular shell. The penetrable layer is configured to receive an impactor and overlie the liner. When the insertion guide is placed on the shell and the impactor impacts the liner, the insertion guide separates from the liner and remains on the impactor.

The invention relates to the technical field of orthopedics and discloses an orthopedic implant. The orthopedic implant is spherical in shape and concave in a region of a bottom surface portion of theorthopedic implant to form an inner concave surface for contacting an acetabular liner or a femoral ball head to form a joint movable friction pair; at least a portion of that bottom region of the external spherical surface of the orthopedic implant extend outwardly to form an extension structure for contacting the human primary bone outside the acetabular fossa aft the orthopedic implant is implanted into the acetabular fossa of the human primary pelvis. In the manner described above, the present invention can improve the biological fixation performance of orthopedic implants.

The invention proposes a hip joint prosthesis. The hip joint prosthesis comprises an acetabular liner and a femoral head prosthesis, wherein the acetabular liner is provided with an inner wall defining a cavity and an opening and a protruding block protruding from the inner wall, the protruding block is provided with a side surface extending from the opening towards the cavity, and the inner wallcomprises a spherical wall in a spherical shape; and the femoral head prosthesis is provided with a spherical shape corresponding to the spherical wall and provided with a cooperating surface, the side surface extends obliquely with respect to the opening and is configured to cooperate with the cooperating surface, so that the femoral head prosthesis is only allowed to enter and exit the cavity ina direction oblique with respect to the opening.

Dislocation-resistant hip joint prosthesis of a 3D printing femoral head comprises an acetabulum lining. The dislocation-resistant hip joint prosthesis is characterized in that a hemispherical grooveis formed in the acetabulum lining, the edge of the hemispherical groove integrally extends to form an ultra-diameter buckling edge, 3D printing femoral head prosthesis is arranged inside the acetabulum lining, is spherical and is uniform to size of inside space of the acetabulum lining, diameter of an opening of the ultra-diameter buckling edge is smaller than that of the 3D printing femoral headprosthesis, and femoral neck prosthesis is arranged on the 3D printing femoral head prosthesis.

The invention discloses a clamping tool applicable to an acetabulum lining and relates to the technical field of medical instruments, wherein the clamping tool comprises a pedestal, a lifting component and a clamping component; the lifting component is arranged on the pedestal and can be used for supporting the acetabulum lining and making the top end of the acetabulum lining be toward the liftingdirection of the lifting component; the clamping component is arranged on the pedestal and comprises a supporting part and a clamping plate; one end of the supporting part is fixed to the pedestal; the other end of the supporting part is connected with the clamping plate; the side, toward the pedestal, of the clamping plate is provided with a spherical groove; and when the acetabulum lining is clamped by the clamping tool, the inner wall of the spherical groove clings to the top end of the acetabulum lining so that the acetabulum lining is clamped. Compared with an existing method, the clamping tool can be used for conveniently and quickly clamping the acetabulum lining and effectively prevents occurrence of a situation that the surface of the acetabulum lining is damaged by clamping.