198 results about "Diaphysis" patented technology

Intramedullary osteosynthesis implant, permitting in particular arthrodesis (1) of a joint, for example an interphalangeal joint, or diaphyseal osteosynthesis of the upper limb or of the lower limb, comprising two sets of at least two rods (2, 3, 4, 5) each extending on either side of a central zone (6), said rods (2, 3; 4, 5) being substantially parallel at ambient temperature within the same set, each set of rods being intended to be impacted in the medullary canal of a diaphysis, said implant being made from a shape-memory material so that, at body temperature, the rods (2, 3; 4, 5) of the same set spread apart so as to be able to immobilize themselves in said medullary canal.

The humeral portion of a shoulder prosthesis includes a diaphyseal component configured for fixation within the humerus, a metaphyseal component, configured for removable implantation within the metaphysis of the humerus, and an engagement mechanism for removably engaging the two components. The metaphyseal component can initially include a convex articulating surface that can be replaced with a concave surface during the shoulder arthroplasty procedure or in a subsequent revision surgery. The metaphyseal component can also include a feature to facilitate removal of the component from the bone once it has been disengaged from the diaphyseal component.

A method and apparatus for performing a minimally invasive total hip arthroplasty. An approximately 3.75-5 centimeter (1.5-2 inch) anterior incision is made in line with the femoral neck. The femoral neck is severed from the femoral shaft and removed through the anterior incision. The acetabulum is prepared for receiving an acetabular cup through the anterior incision and the acetabular cup is placed into the acetabulum through the anterior incision. A posterior incision of approximately 2-3 centimeters (0.8-1.2 inches) is generally aligned with the axis of the femoral shaft and provides access to the femoral shaft. Preparation of the femoral shaft including the reaming and rasping thereof is performed through the posterior incision, and the femoral stem is inserted through the posterior incision for implantation in the femur. A variety of novel instruments including an osteotomy guide an awl for locating a posterior incision aligned with the axis of the femoral shaft, a tubular posterior retracter, a selectively lockable rasp handle with an engagement guide; and a selectively lockabele provisional neck are utilized to perform the total hip arthroplasty of the current invention.

An implant for shoulder arthroplasty includes a stem and optionally a head component or a cup component. The stem is sized and shaped to fit into an intramedullary canal of the humerus. The proximal portion of the stem has a concave taper and the distal portion of the stem has a taper. The distal taper includes an anterior-posterior taper and a medial-lateral taper. The shape of the stem loads the metaphysis of the humerus with a greater load than the load applied to the diaphysis of the humerus.

An implant for causing fusion of bones in an ankle is disclosed. The implant, in a preferred embodiment, is a cannulated screw with threads at the leading end and threads at the trailing end having a a tibial component that interacts with the tibia, a calcaneus component that interacts with the calcaneus and a midsection extending between the tibial component and the calcaneus component. The implant is placed in a borehole formed in the tibia, talus and calcaneus and causes the tibia and talus to be moved into compressive contact with each other. As a result, the ends of the tibia and talus that have previously had the cartilage removed down to bloody bone are coapted together to allow fusion. In another embodiment of the invention, a middle threaded portion is placed between the tibial component and the calcaneus component. The middle threaded portion interacts with the talus to help add compressive force to the fusion process. The invention also includes a method for using the implant to fuse the bones of the ankle together. The method includes steps of producing an implant and then using the implant to apply compressive forces on the bones of the ankle. The invention in one embodiment also includes a method that uses images such as x-ray images preoperatively to determine the length and width of the disclosed implant or any other implant with each patient's unique anatomy will properly allow coaption of the ends of the prepared tibia and talus at the ankle joint. The implant is inserted from the bottom of the foot through a predetermined hole in the calcaneus which extends through the talus into the diaphysis of the tibia. When properly inserted and seated in the bones, the implant is locked by screws.

A modular implant system allows a surgeon to secure an implant assembly to thee diaphysis of a long bone. The system includes a set of anatomically-designed diaphyseal fitting modular implant components. One end of each diaphyseal implant component is a Morse taper post for connection to another implant component such as a modular articular component, a segmental component or an intercalary component. The other end of each diaphyseal component is a tapered porous surface. In some sizes, the tapered porous surface includes a plurality of steps. The tapered porous surface is received with a tapered bore in the bone diaphysis that is prepared to match the size and shape of the tapered porous surface. The diaphyseal implant is easy to insert and remove, does not bind before fully seating, is designed to prevent stress shielding and provides the surgeon with a host of stem options with its modularity.

A humeral prosthetic head has a non-spherical articulation surface coupled with an intermediate component connecting the head and the humerus, the intermediate component connected to the epiphysis, metaphysis, or diaphysis, or to one or more additional components connected to the humerus. The intermediate portion provides for axial and angular offset of the head with respect to a connection to the humerus, using a curvilinear tapered engagement.

The microporous bone cement consists of bone cement 1 weight portion and modifier 0.2-0.7 weight portion mixed together, and its modifier consists of adhesive 30-50 portions, promoter 30-50 weight portions and pore creating agent 10-30 weight portions. The bone paste consists of bone cement 1 weight portion and modifier 0.7-1.3 weight portions mixed together, and its modifier consists of adhesive 30-50 portions, promoter 30-50 weight portions and pore creating agent 10-30 weight portions. The microporous bone cement has most of the mechanical strength of common bone cement maintained, close adhesion between prosthesis and diaphysis and low curing temperature. The bone paste has relatively high mechanical strength and is suitable for repair of severe bone default and tooth.

The porous bone cement of the present invention consists of bone cement in 1 weight portions and modifier in 0.2-0.7 weight portions mixed together, and its modifier consists of binder 30-50 weight portions, promoter 30-50 weight portions and pore creating agent 10-30 weight portions. The bone paste of the present invention consists of bone cement in 1 weight portions and modifier in 0.7-1.3 weight portions mixed together, and its modifier consists of binder 30-50 weight portions, promoter 30-50 weight portions and pore creating agent 10-30 weight portions. The bone cement of the present invention has mechanical strength similar to that of common bone cement, close cementation between prosthesis and diaphysis, and low curing temperature. The bone paste of the present invention has relatively high mechanical strength and is suitable for repair of serious bone defect and tooth.

The invention provides a tissue engineered bone-cartilage composite tissue transplant and a preparation method thereof, and belongs to the tissue engineering field. The method comprises the following steps: seed cells are implanted on a scaffold material and cultured in vitro to form the tissue engineered bone-cartilage composite tissue transplant; the seed cells are osteogenic stem cells; the scaffold material comprises an osteogenic part and a chondroblast part, and the osteogenic part is added with an osteoblast induction factor and modified by a type-I collagen in a preparation process; and the chondroblast part is added with a chondroblast induction factor and modified by a type-II collagen. Bone marrow mesenchymal stem cells are successfully induced into osteocytes and chondrocytes, and bone tissues and cartilage tissues are formed after the obtained transplant is transplanted in vivo. Satisfactory effect is obtained from the tissue engineered bone-cartilage composite tissue which is constructed by the transplant.

The present invention relates to a method for fixing an intramedullary cavity nail for the treatment of unstable trochanteric fractures and to a targeting device for use in performing the steps of said method. According to the method, a recess (16) for a femur neck screw (8) for fixing the cavity nail (2) is provided in at least the lateral cortex of the femoral shaft (FS) in close distal proximity to a hole (9) for the femur neck screw such that bone fragment(s) located distally of the fracture and bone fragment(s) located proximally of the fracture relatively seen can be displaced towards each other. A targeting head (5) of the targeting device (1) is configured with a targeting bore (14) which is alignable with a point on the femoral shaft (FS) in close distal proximity to the hole (9) for the femur neck screw (8) for use in providing at said point, said recess (16) for the femur neck screw.

A modular implant system includes a set of anatomically-designed diaphyseal fitting and filling modular implant components and collars. The diaphyseal component connects with a selected intramedullary stem and with a selected collar component. The collar component connects to another implant component such as a modular articular component, a segmental component or an intercalary component. The diaphyseal component has a tapered porous surface that is received with a tapered bore in the bone diaphysis that is prepared to match the size and shape of the tapered porous surface. The collar component has a porous surface for tissue ingrowth, such as the periosteum, to seal the intramedullary canal. The diaphyseal implant is easy to insert and remove, does not bind before fully seating to prevent stress shielding, and eliminates the long lever arm created when fixation occurs only at the tip of the stem, and should eliminate related stem loosening.

An invertebral implant for replacing a damage invertebral disk within the spinal column can include a generally flat body having opposing surfaces. To promote bone growth and fusion of the adjacent vertebrae together, in an aspect, the implant can be provided with osteogenic or medicinal material received into one or more apertures disposed into the surfaces of the implant. To better retain the osteogenic material, the apertures can be disposed on a non-perpendicular angle with respect to the implant and/or can be tapered. In another aspect, the implant can include a plurality of grooves disposed across a surface to reduce slipping of the inserted implant between the adjacent vertebrae. In a further aspect, the implant can be formed by cutting a plurality of implants parallel along the diaphysis of a long bone. In another aspect, the implant can be generally as a bow or question mark.

The invention provides a pneumatic-muscles-based robot hind limb simulating a cheetah. The structure of the robot hind limb comprises a hip unit 1, a thigh unit 2, a shin unit 3 and a foot unit 4, wherein the hip unit 1, the thigh unit and the shin unit respectively comprise a diaphysis and joint parts. The overall robot hind limb adopts a structural form that the diaphysis is placed inside and pneumatic muscles are placed outside to package the periphery of the diaphysis, the structural form is similar to the real body structure of an organism and approaches to a force-exerting form of the cheetah hind limb. The joint of the robot hind limb passes through a connector of upper and lower diaphyses by a connecting shaft and is supported by a rolling bearing; and one end of the connecting shaft extends out of the bearing to be connected with an angle sensor so as to obtain joint angle-rotating information and provide data for motion control. The joint ensures that linear force of the muscles is converted to rotating torque of the joint in a form of pulling (in opposite directions) of pneumatic muscles, and the rigidity is adjustable.

A surgical guide for guiding and steady a saw during surgery, especially adapted to perform at least one, and preferably both, an extended trochanteric osteotomy and a trochanteric slide. The guide includes a linear slot and two slots at opposing oblique angles to the linear slot; the slots are adapted to cooperate with a surgical saw. In a preferred version, the guide is reversible so that it may be used on either a left or right leg depending on which leg the surgery is being performed on. The linear slot may be used for cutting the diaphysis of the femur and one oblique slot may be used for cutting a proximal portion of the femur, while the other oblique slot may be used for cutting a distal portion of the femur. The guide may also include a plurality of anchoring holes through which fixation pins may be inserted to secure the guide to the femur while sawing. In the preferred version, the guide may be adapted to cooperate with at least one alignment mechanism for positioning the guide on the diaphysis of the femur in order to determine where the cuts should be made.

The invention relates the spring intramedullary nail, comprising intramedullary nail and screw. The intramedullary nail is composed by nail, spring device and cap screw. The cap screw is connected with screw, the axial diameter of screw is more than the transverse diameter of screw, the screw can axially move, in the nail there is steps, the spring device is on the steps, and the spring device is stiff spring or macromolecule elastic capsule. The intramedullary nail has the advantages of improving the acting force of knitting and paresis, accelerating assimilation, enhancing sclerotic strength, and avoiding osteoporosis.

The invention relates to a high-connectivity gradient bionic artificial bone structure and a preparation method thereof, belonging to the field of medical artificial bones. The method is suitable forthe design of a gradient bionic artificial bone with three-period pores, and a plurality of holes which are communicated with one another are distributed completely or locally in the artificial bone;each of the pores has three dimensions periodically extending towards three peripheral axes, and pore sizes can be controlled through porosity; the porosity can reduce the elasticity modulus of a metal material, and avoid interfacial loosening, stress shielding and degradation or absorption of bone tissue caused by too high elasticity modulus of metal and the like. The artificial bone is printed and constructed layer by layer by using metal powder or a hydroxyapatite biological material in additive manufacturing; and holes in the surface of the artificial bone can promote interface osteogenesis, enhance interface fusion and induce osteogenic differentiation of backbone cells at an interface, and bone tissue and an artificial bone implant are combined more firmly.