50 results about "Surface replacement" patented technology

Disclosed herein are devices, systems and methods for the automated design and manufacture of patient-specific / patient-matched orthopedic implants. While the embodiments described herein specifically pertain to unicompartmental resurfacing implants for the knee, the principles described are applicable to other types of knee implants (including, without limitation, other resurfacing implants and joint replacement implants) as well as implants for other joints and other patient-specific orthopedic applications.

An instrument for use in removal of a prosthetic implant for use performing arthroplasty is provided. The instrument includes a body and a first member. The first member is operably associated with the body. The first member has a contact portion for engagement with the implant at a first position. The instrument also includes a second member operably associated with the body. The second member is moveable with respect to the first member and the second member has a contact portion for engagement with the implant at a second position, spaced from the first position.

A radial-capitellar implant for surgical replacement of the capitellum of the humerus and, optionally, the head of the radius. The radial-capitellar implant includes a capitellar implant or surface replacement arthroplasty of the capitellum and a radial prosthesis for replacement of the head of the radius. In one embodiment the radial prosthesis includes an articular head which moveable articulates with a stem implantable in the radius.

A method for locating a guide wire axis on a femoral neck comprises the steps of tracking a position and orientation of a femur; registering a frame of reference with respect to the position and orientation of the femur from a first registration probe mounted onto the femur in a predetermined configuration, the frame of reference having preoperative planned data pertaining to the femoral neck; digitizing femoral neck data with respect to the position and orientation of the femur from a second registration probe positioned onto the femoral neck at desired orientations; calculating a position and orientation of the guide wire axis with respect to the position and orientation of the femur as a function of the preoperative planned data and the femoral neck data.

Provided is a femoral head surface replacement system including a femoral head aspherical cup having a round cavity inside and a distal end having an open lower end, and a stem installed on the femoral head aspherical cup and extending to a lower side end thereof. In the femoral head aspherical cup, a cavity is formed so that a femoral head is inserted therein, a conic insertion protrusion protrudes from an upper side of the cavity, and the distal end is formed of a plurality of protruding portions and groove portions. In the stem, an insertion hole is formed corresponding to the insertion protrusion of the femoral head aspherical cup so that the stem is fixed to the femoral head aspherical cup as the insertion protrusion is forcibly inserted into the insertion hole.

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 method for selecting a femoral implant based on models of a femoral neck and / or a femoral head of a patient is provided. A femoral neck model and / or femoral head model is produced from three-dimensional reference point spatial positions of the femoral neck or head, and a base size of a femoral implant model is ascertained based on the femoral head model. A femoral implant model is produced from the base size, and the implant model is positioned at a position in or on the femoral head model. An implant value is ascertained that indicates how many or what proportion of the ascertained reference point spatial positions are outside the implant model. If the implant value exceeds a predetermined value, the implant model is repositioned and the process is repeated. If the implant value does not exceed the value, an appropriate size and position of the implant is determined.

In order to improve the process of inserting a facet joint implant comprising two, flat joint surface replacement elements abutting each other face-to-face and in order to control the movement of the joint surface replacement elements relative to each other, it is proposed that both joint surface replacement elements should carry at least one arm which emerges in the plane of the joint surface replacement element from said element and projects therefrom, and in that in each case two arms of the two joint surface replacement elements which extend adjacent to one another in a pair are connected together at the end thereof remote from the joint surface replacement element.

A radial-capitellar implant for surgical replacement of the capitellum of the humerus and, optionally, the head of the radius. The radial-capitellar implant includes a capitellar implant or surface replacement arthroplasty of the capitellum and a radial prosthesis for replacement of the head of the radius. In one embodiment the radial prosthesis includes an articular head which moveable articulates with a stem implantable in the radius.

A method for selecting a femoral implant based on models of a femoral neck and / or a femoral head of a patient, includes: a) detecting reference points on the femoral neck and / or femoral head of the patient; b) registering the femoral neck and / or femoral head based on three-dimensional reference point spatial positions of the detected reference points; c) producing a femoral neck model and / or femoral head model from the three-dimensional reference point spatial positions; d) ascertaining a base size of a femoral implant model based on the femoral head model; e) producing a femoral implant model based on the base size of the femoral implant model; f) positioning the femoral implant model at a position in or on the femoral head model; g) ascertaining an implant value that indicates how many or what proportion of the ascertained reference point spatial positions are outside the femoral implant model; h) determining if the implant value exceeds a predetermined limit value; and i) if the implant value exceeds the limit value, repositioning the femoral implant model and performing steps g) to i), or if the implant value does not exceed the limit value, determining an appropriate size and position of the femoral implant.

The present invention relates to a foamed ceramic annular filler. Said filler comprises annular body and cylindrical hollow cavity, and said filler is made up by adopting foamed ceramics with 3-D porous reticular structure as raw material, its specific surface area is large, void volume is high, and its mass transfer surface and surface replacement rate are good.

The invention provides a rotary-type two-sided white board. The rotary-type two-sided white board comprises a left support, a right support, a main white board body and a subsidiary white board body. A cross beam is fixedly connected between the left support and the right support. The main white board body and the subsidiary white board body are correspondingly installed on the inner side of the upper end of the left support and the inner side of the upper end of the right support respectively. An upper horizontal sliding chute and a lower horizontal sliding chute are arranged on the reverse side of the main white board body respectively. An upper horizontal guide rail and a lower horizontal guide rail are arranged on the obverse side of the subsidiary white board body respectively, wherein the upper horizontal guide rail and the lower horizontal guide rail are correspondingly located in the upper horizontal sliding chute and the lower horizontal sliding chute respectively and are in slide fit with the wall of the upper horizontal sliding chute and the wall of the lower horizontal sliding chute. A screw hole is formed in the middle of the cross beam, and an ejector rod provided with an external thread is in screw connection with the screw hole. The two ends of the ejector rod penetrate through the screw whole respectively and extend out of the screw hole. A supporting seat is fixedly connected to the upper end of the ejector rod and provided with a clamping groove used for clamping the main white board body and the subsidiary white board body. The rotary-type two-sided white board is simple in structure, is of a structure composed of the sliding chutes and the guide rails, facilitates usage and writing, and is convenient to transfer and carry; the white board bodies on two sides are adopted as the main body, a rotation side-change structure and an automatic position fixing device are provided, and therefore the writing surface replacement process is easier and simpler.

A prosthesis for attachment to the proximal humerus of a patient during a shoulder arthroplasty has a cup and a spacer. The cup has an articulation surface and an internal surface opposed to the articulation surface. At least a portion of the internal surface is concave. The spacer has a support surface and an opposed surface. The support surface is configured for intimate contact with the proximal humerus and the opposed surface is configured for assembly to the internal surface of the cup.

The method relates to a method for preparing a carbon nano-tube denitration catalyst with a composite hierarchical structure and belongs to the field of environmental protection catalytic materials. The method comprises adding a multi-walled carbon nanotube in a mass ratio of (0.5-20):1 with potassium permanganate to a potassium permanganate solution, performing ultrasonic dispersion, using acetic acid to adjust the pH to 1-4, warning the mixed solution to 60-90 DEG C with stirring to perform backflow, reacting for 2-5 h and then washing a product through deionized water; after the drying, adding an obtained manganese dioxide-carbon nano-tube compound to deionized water, performing ultrasonic dispersion, adding a certain amount of bivalent metal salt in the solution, warming the mixed solution with stirring, carrying out surface replacement reaction, using deionized water to wash the product, and obtaining the carbon nano-tube denitration catalyst with the composite hierarchical structure after the drying. The catalyst has good efficiency of converting nitrogen oxides in flue gas. The catalyst can be applied to treatment of the nitrogen oxides in the flue gas emitted by fixed sources such as steel mills and coal-fired power plants.

The invention discloses a knee-joint internal and external rotating angle measurer used in the knee-joint surface replacement technology for a surgery. According to the knee-joint surface replacement technology, due to the moderate outward rotation of a prosthesis on the thighbone side, a buckling clearance and a straightening clearance can be well matched, and the complication caused by poor motion track of the patella is reduced. The knee-joint internal and external rotating angle measurer is composed of a rear condyle positioning frame and an angle ruler. A rotating shaft of the angle ruler is located in a longitudinal groove in the rear condyle positioning frame, and the angle ruler can horizontally move up and down and can rotate around the shaft, so that the angles of different skeletons are measured. According to the knee-joint internal and external rotating angle measurer, on the basis of the actual requirement in the knee-joint replacement technology, the knee-joint internal and external rotating angle measurer is developed, the knee-joint internal and external rotating angle measurer is simple in structure, accurate in measurement, convenient to use and universal during the surgery, measurement of the knee-joint internal and external rotation angles during the surgery is achieved, and supports are provided for accurate implementation of the surgery.

The invention relates to a carpet surface replacement type assembled ground mat, which includes an underframe body, a bevel edge body and a bevel angle body that are spliced with each other. A carpet surface is arranged on the underframe body, a groove body is formed in the top surface of the underframe body, a carpet support matched with the groove body in shape is arranged in the groove body, a carpet face is arranged on the top face of the carpet support, buckles are arranged on the bottom face of the carpet support, clamping grooves corresponding to the buckles of the carpet support are formed in the bottom face of the groove body, the bottom face of the carpet support is attached to the bottom face of the groove body, and the buckles of the carpet support are inserted into the clamping grooves to be fixed. According to the invention, the carpet surface is separated from the underframe body, the two independent single bodies are formed and then assembled, thus when the carpet surface is replaced, the old carpet support is directly taken out, the carpet support with the new carpet surface is arranged, the process is simple and convenient, operation is facilitated, meanwhile, anti-warping strips are additionally arranged, the stable B-type buckles are adopted, product warping is prevented, and potential safety hazards of pedestrians are reduced.

The invention discloses a roller brush, which comprises a roller, an installation handle and a handle; the roller is arranged on the installation handle; a handle is arranged on the installation handle; protrusions are evenly arranged on the surface of the roller; A replacement surface is provided on the surface; a concave hole is provided on the lower surface of the replacement surface; the protrusion is connected with the concave hole; the handle and the installation handle are connected by threads; one end of the handle is provided with an external thread, The other end is provided with an internal thread; the external thread is mated with the internal thread; a gripper is provided on the installation handle; the gripper is hinged to the installation handle; a return spring is arranged between the grippers; Described roller is installed on the clamping hand again. The invention is simple to replace, convenient to install, reduces cost, has strong practicability, can be disassembled and installed, and is easy to carry.

A system for creating a patient-specific jig model for patellar resurfacing surgery comprises a patellar implant positioning module for obtaining a planned position of a patellar implant on a model of the patella, the model being anatomically patient-specific. A patella resurfacing calculator module calculates a position and / or orientation of a resurfacing plane and attachment bore in the patella as a function of the planned position of the patellar implant. A jig model generator module for generates and outputs a virtual jig model using the resurfacing plane and attachment bore of the patella and the model of the patella, the jig model comprising at least one patient-specific contact surface corresponding to a surface of the patella for complementary contact, at least one drill guide positioned relative to the at least one patient-specific contact surface to be configured to guide a tool defining the attachment bore for the patellar implant, and at least one cut guide positioned relative to the at least one patient-specific contact surface to be configured to guide a tool in resurfacing the patella to form the planned resurfacing plane.

The invention discloses a caput femoris surface replacement prosthesis. The caput femoris surface replacement prosthesis comprises a joint part and a collum femoris insertosome, wherein one end, awayfrom the collum femoris insertosome, of the joint part is a spherical surface, attachment structural layers capable of being embedded into a human body are arranged at one end, close to the collum femoris insertosome, of the joint part and the collum femoris insertosome, and a fixing unit is also arranged on the collum femoris insertosome. According to the caput femoris surface replacement prosthesis, a spherical surface structure at the joint part can replace a caput femoris surface joint of a human body, the collum femoris insertosome can be inserted into medullary space of collum femoris, the attachment structural layers are arranged on one side of the joint part and on the surface of the collum femoris insertosome and used for biological fixation, bone ingrowth is facilitated, and final embedment of the prosthesis and bone of the human body is realized; and besides, the fixing unit is arranged on the collum femoris insertosome and can prevent the prosthesis from rotating or retreating, the position correctness and stability of the prosthesis are effectively guaranteed, and the service life of the prosthesis is prolonged.

The invention discloses a combined ring with convenient ring surface replacement and a replacement method. The combined ring comprises a ring loop, a ring support, a locking mechanism, a mounting plate, a mounting block and a ring surface; the ring surface is arranged on the mounting block; the ring support is arranged on the ring loop; the locking mechanism is arranged in an accommodating cavityinside the ring support; the mounting plate is hinged to the locking mechanism; and the mounting block is slidably arranged on the ring support and can trigger the locking mechanism to lock or unlockthe mounting block on the ring support. The combined ring provided by the invention has an ingenious structure and is convenient to replace the ring surface.

The invention discloses a multifunctional roller brush, which comprises a roller, an installation handle and a handle; the roller is arranged on the installation handle; a handle is arranged on the installation handle; protrusions are evenly arranged on the surface of the roller; A replacement surface is provided on the surface of the drum; a concave hole is provided on the lower surface of the replacement surface; the protrusion is connected with the concave hole; the handle and the installation handle are connected by threads; one end of the handle is provided with an outer thread, the other end is provided with an internal thread; the replacement surface is provided with a spout; the spout is connected to the feed pipe; the feed pipe is connected to the paint bucket; the feed pipe is provided with a valve between the paint buckets The paint bucket is connected with an air compressor; the installation handle is provided with a recovery baffle; the recovery baffle communicates with the paint bucket through a recovery pipe. The invention is easy to replace, easy to install, strong in practicability, detachable for installation, easy to carry, automatic feeding, time-saving and labor-saving, and recycles trickling paint to avoid waste.

An integrated overprint colorful seal with multiple printing surfaces, comprising a seal housing (1), a middle frame (2) accommodated in the seal housing (1), a spring (3) squeezed between the seal housing and the middle frame, a seal body (4) in a regular triangular prism or a quadrangular prism shape, and a driving mechanism. Each side surface of the seal body (4) in the regular triangular prism or quadrangular prism shape is a printing surface (60) in a different color and the printing surface is overprinted on a target object to show a colorful seal pattern. The seal integrates the multiple printing surfaces in an integral whole, can implement semi-automatic overprint of three colors or four colors and is precise in overprint. The seal also supports printing surface replacement and ink-replenishment, and is easy to use and convenient to carry.

The invention discloses a rack steel billet milling machine which comprises a lathe base, a worktable and milling cutter devices, wherein the worktable is connected with the lathe base through a linear guide rail; a positioning device used for positioning the rack steel billet is arranged on the worktable; the positioning device comprises a rack cushion block base, a rack cushion block, a positioning cylinder mechanical hand and a pressurization cylinder; the milling cutter devices are symmetrically arranged on two sides of the rack cushion block; a milling machine feeding rack assembly is arranged on a feeding side of the lathe base; a milling machine discharger is arranged on a discharging side of the worktable. The rack steel billet milling machine is reasonable in structural design, can simultaneously machine two side faces and performs twice rough and fine milling on one surface at a time; surface replacement is automatically finished through a reversing mechanical hand for later machining, the machining efficiency is improved, the production quality is improved, the feeding and discharging operations are automatically finished, and the degree of automation is high.

Surgical Guide for Positioning a Resurfacing Head Implant The present invention relates to a guide for positioning a resurfacing head implant into the appropriate position and angles on the femur bone. The present invention therefore provides a guide system for an implantable device (e.g. a resurfacing head implant), said guide system comprising a first component arranged to act as a clamp and a second component arranged to interact with the first component to prevent movement of said first component when clamped.

A zero-incisura conjoined screw for adjacent vertebral bodies comprises a main screw (1), an auxiliary screw (2) and a locking nut (3), a screw containing groove (4) is formed in the top of a screw cap of the main screw (1), a screw inclined inserting hole (5) is formed in the bottom of the screw containing groove (4), a screw rod of the auxiliary screw (2) is inserted into the screw inclined inserting hole (5), and the screw cap of the auxiliary screw (2) is located in the screw containing groove (4). Internal threads are arranged on the inner wall of the upper portion of the screw containing groove (4), the locking nut (3) is installed in the screw containing groove (4) in a threaded mode, and a nut cap of the auxiliary screw (2) is pressed in the screw containing groove (4) through the locking nut (3); the device has the advantages that the device is small in size, minimally invasive, high in pulling resistance and stability and high in rotation resistance balance; 2, the device can be used for partial surface replacement of cancellous centrum, thighbone lower end and tibia knee joint surface;