117 results about "Ankle bone" patented technology

Patient-specific instruments for preparing bones for receipt of orthopedic prostheses, such as the distal tibia and the talus in a total ankle arthroplasty (TAA) procedure. A tibial guide and a talar guide are manufactured based on patient-specific anatomical data obtained using imaging technology, and each guide includes a surface conforming to selected anatomical surfaces or regions of the tibia or talus, respectively. Each guide includes at least one cut referencing surface, such as a cut slot, to guide a resection, and may also include a guide aperture sized to guide a reaming tool for reaming the distal tibia or talus. The guides may also include pin holes positioned within a periphery defined by the cut referencing surfaces such that, when the resections are made and the resected tibial bone portion or talus bone portion is removed, the guide and its associated pins are removed along with the resected bone portion. The guides may be designed to ensure that a proximal resected surface of the distal tibia is parallel to a resected surface of the talus, with the parallel resected surfaces perpendicular to the anatomical axis of the distal tibia.

Ankle prosthesis apparatuses, systems and methods are provided as disclosed herein. Additionally, systems and methods for bone resection and implantation of prosthetics are provided, including surgical techniques and related instrumentation. An ankle prosthesis apparatus can include a talar component having a lower surface with a bone fixation portion for fixation to a talus bone and an upper surface designed for articulation with a bearing component. The bearing component can have a lower surface for articulation with the talar component and an upper surface for articulation with a tibial component. The tibial component can have a lower surface for articulation with the bearing component and an upper surface with a bone fixation portion for fixation to a tibia bone and / or a fibula bone. The bearing component can have a protrusion on its upper surface adapted for engagement with a recess on the tibial component to allow desired rotational and translational movement. Methods and systems can be used to prepare a bone surface for implantation of a prosthesis including determining a location for a curved cut line on the bone surface and drilling a series of holes tangent to the curved cut line to create a curved bone resection surface. Methods and systems can be used for the implantation of an ankle joint prosthesis including the use of an alignment guide, tibia and talus drill guides, tibia and talus saw guides, and tibia and talus broach guides, all components of which can be placed on and removed from a plurality of alignment anchor pins throughout the implantation procedure. A method for medially to laterally implanting an ankle joint prosthesis can include exposing tibia and talus bones from the medial side, resection of the tibia and talus bones, broaching the tibia and talus bones, and positioning and affixing the ankle joint prosthesis components.

The ankle joint prosthesis adapted to involve the patient's distal tibia and talus has, according to the present invention, tibial, talar and mobile or semi-constrained bearing components that are laterally to medially implanted in the patient. The tibial component's top surface has convex curvature in its anterior to posterior plane and is configured so as to approximate and match with the curvature of a prepared portion of the distal tibia; its bottom surface being approximately flat. The talar component's top surface has saddle-shaped, convex curvature in its anterior to posterior plane, it's bottom surface has concave curvature and is configured so as to approximate and match with the curvature of a prepared portion of the talus. The mobile or semi-constrained bearing components have embodiments that comprise a wide variety of geometric shapes. A method for implanting such a prosthesis is also disclosed.

A joint resurfacing system for repairing defects in the articular surface of bones in the foot. The system includes a hemiarthroplasty implant for the talus resulting in minimal removal of the underlying bone. The implant device comprises a first curved surface and a second curved surface, with the second curved surface coupled to an articular surface of a talus bone via a dynamic fixation device.

Ankle implant systems and methods are provided that can allow a surgeon to select the type of prosthesis desired during an ankle surgical operation. The surgeon can implant a set of standardized fixation components into the tibia and / or fibula bones and the talus bone. Once implanted, the surgeon can select a bearing component from a number of bearing components that allow for different size patients, but also modify the manner in which the prosthesis functions (either semiconstrained or unconstrained). In one embodiment, an ankle implant can include a talar component having a lower surface with a bone fixation portion for fixation to a talus bone. A tibial component has an upper surface with a bone fixation portion for fixation of the tibial component to a tibia bone and / or a fibula bone, and the tibial component also has a lower surface with at least one protrusion extending from the lower surface. A bearing component is included between the tibial and talar components and has a lower surface for cooperative engagement with an upper surface of the talar component. The protrusion of the tibial component is adapted to engage a recess of the bearing component to desirably limit rotational and translational movement of the tibial component relative to the bearing component.

A subsidence protection device is provided. The subsidence protection device may be placed in either the tibia or the talus to support a portion of a total ankle prosthesis.

A fixation device for reduction and fixation of fractures of the talus bone of the foot includes a thin titanium alloy plate having a lower wing configured for attachment to the lateral aspect of the talus and an upper wing configured for attachment to the dorsal aspect of the talus. The plate includes a substantially perpendicular or right angle bend between the lower and upper wings. In one embodiment, each wing includes three screw holes arranged in a generally triangular pattern. Two holes on each plate are situated in tabs and the center of the plate has a reduced width so that the plate presents a minimal profile. One of the tabs on the upper wing is bent away from the lower wing at a pre-determined angle so that the wing conforms to the shape of the talus. In an alternative embodiment, the upper wing includes a step portion between the lower wing and the bent tab and carrying one screw hole. In this embodiment, the bent tab is generally elongated with one or two screw holes disposed along its length.

A heel counter 4 includes: a support section 43 extending in a forward direction from a back side 1b of an upper 1; a rib 40 extending in the forward direction generally in parallel to the support section 43 at a position above the support section 43 from the back side 1b of the upper 1 along a medial side 11 and extending in the forward direction generally in parallel to the support section 43 at a position above the support section 43 from the back side 1b of the upper 1 along a lateral side 12; and first and second bridge means 41a, 41b and 42 connecting the support section 43 and the rib 40 to each other allowing the support section 43 to support the rib 40, wherein: a foremost one 46b of a plurality of connection portions 46b, 46c and 46e by which the rib 40 and the bridge means 41a, 41b and 42 are connected to each other is provided on the medial side of the upper 1; and the foremost connection portion 46b is located forward of a rear end of a talus bone B8.

A surgical instrument including at least one tibial phantom generally corresponding to at least certain features of the tibial implant. The tibial phantom includes a top surface adapted to move freely against the prepared bottom end of the tibia. At least one talus phantom generally corresponding to at least certain features of the talus implant is engaged with the prepared top surface of the talus. At least one phantom skid is located between the tibial phantom and the talus phantom. The phantom skid is engaged with the tibial phantom such that dynamic engagement between the phantom skid and the talus phantom through at least extension and flexion of the ankle joint positions the tibial phantom on the prepared bottom end of the tibia. The phantom skid can either be a part of the tibial phantom or a separate component.

An ankle implant having a tibial component with a bottom groove, a talar component with a convex dome on top, and a bearing component slidably insertable into the bottom groove in the tibial component and having a concave bottom recess receiving the top dome of the talar component. The tibial component is channel-shaped, with a flat bottom wall for reception in a corresponding surgically prepared recess in the bottom of the patient's tibia, an anteriorly inclined posterior end wall projecting up from its bottom wall, a taller anterior end wall perpendicular to its bottom wall, and a rounded groove on the inside at the juncture between the anterior and bottom walls. The talar component has a cross-shaped segment on the bottom for reception in a corresponding surgically prepared recess in the top of the patient's talus.

A talus surface implant has an arc shaped body with a top side interfacing to the tibia and a bottom side having at least one post for interfacing with holes in the talus and a plurality of spikes for interfacing with the surface of the talus. Preferably the implant is double arc shaped.

The invention relates to the technical field of medical instruments, in particular to a talonavicular fusion plate which comprises a fusion plate near end, a fusion plate far end and a fusion plate body connecting the fusion plate near end and the fusion plate far end. The fusion plate near end, the fusion plate far end and the fusion plate body are formed integrally. The fusion plate near end is provided with a fixing hole used for being fixedly connected with a talus bone, and the fusion plate far end is provided with a fixing hole used for being fixedly connected with a tarsal navicular bone. According to the talonavicular fusion plate, an anatomic design is adopted, the fusion plate does not need to be bent in advance in an operation, the problem that the fusion plate is prone to loose and fail to be fixed when being fixed by adopting hollow nails, straddle nails and the like is solved, and the problems that in a common fusion plate operation, the fusion plate needs to be bent, as a result, stress concentration is prone to occurring, the fusion plate is broken, the fixing holes are deformed, and the fusion plate is not firmly fixed are solved.

Porous spacers (100) are provided for foot and ankle fusion. The porous spacers disclosed herein may be implanted between separate bones of a joint or between two segments of a single bone following an osteotomy procedure. Such spacers may be used in conjunction with an ankle resection system which includes a resection frame (150) and a resection guide (170). The resection frame can be anchored to the distal tibia and / or the talus and provides an opening (155) through which a bone cutting element can pass for cutting underlying bone. The resection guide can include one or more cutting slots (169, 171, 172) and the resection guide can be coupled to the resection frame with the one or more cutting slots positioned over the opening in the resection frame so that the bone cutting element can pass through the one or more cutting slots and through the opening in the resection frame for cutting the distal tibia and / or the talus.

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.

Custom radiographically designed tibial and talar cutting guide system and instrumentalities including a tibial cutting guide position verification device is disclosed. A computer-based system and method for making the custom radiographically designed tibial and talar cutting guides is also disclosed. Further disclosed is an adjustable tibial reaming guide positioning system for allowing a position for reaming of a distal tibia to be adjusted during total ankle replacement surgery and, particularly, during total ankle arthroplasty for prostheses with an intramedullary stem.

A heel counter 4 includes: a support section 43 extending in a forward direction from a back side 1b of an upper 1; a rib 40 extending in the forward direction generally in parallel to the support section 43 at a position above the support section 43 from the back side 1b of the upper 1 along a medial side 11 and extending in the forward direction generally in parallel to the support section 43 at a position above the support section 43 from the back side 1b of the upper 1 along a lateral side 12; and first and second bridge means 41a, 41b and 42 connecting the support section 43 and the rib 40 to each other allowing the support section 43 to support the rib 40, wherein: a foremost one 46b of a plurality of connection portions 46b, 46c and 46e by which the rib 40 and the bridge means 41a, 41b and 42 are connected to each other is provided on the medial side of the upper 1; and the foremost connection portion 46b is located forward of a rear end of a talus bone B8.

Provided is a system and method for providing a non-binding allograft subtalar joint implant for surgical implant into a person's foot proximate to the ankle. This system for repair includes at least one sterile non-binding allograft subtablar joint implant provided as a pre-formed allograft rod plug “ARP” having a diameter about equal to an average width of a canal between a person's talus and calcaneus bones, the ARP being resiliently compressible and flexible. When snuggly disposed between the person's talus and calcaneus bones, the ARP compresses during normal use of the person's foot and maintains the canal in an anatomically correct alignment and reduces a tendency for abnormal motion between the person's talus and calcaneus bones. An associated method of use is also provided.

A surgical instrument including at least one tibial phantom generally corresponding to at least certain features of the tibial implant. The tibial phantom includes a top surface adapted to move freely against the prepared bottom end of the tibia. At least one talus phantom generally corresponding to at least certain features of the talus implant is engaged with the prepared top surface of the talus. At least one phantom skid is located between the tibial phantom and the talus phantom. The phantom skid is engaged with the tibial phantom such that dynamic engagement between the phantom skid and the talus phantom through at least extension and flexion of the ankle joint positions the tibial phantom on the prepared bottom end of the tibia. The phantom skid can either be a part of the tibial phantom or a separate component.

A batter's lower leg protector product, including a lower leg protector for being custom-formed to the shape of a batter's lower leg while flexible and upon hardening providing a rigid, supporting custom fit. The lower leg protector product includes an outer container formed of moisture-impervious material. A flexible lower leg protector is positioned in the container in substantially moisture-free conditions and sealed therein against entry of moisture until use. The lower leg protector includes a leg portion shaped to provide, when in place on a batter's leg, protection to the front, lateral and medial aspects of the leg above the ankle and optionally-detachable ankle flap portions integrally formed with a bottom edge of the leg portion and shaped to provide protection to the lateral and medial ankle bones. The lower leg protector includes a substrate and a reactive system impregnated into or coated onto the substrate, the system remaining stable when maintained in substantially moisture-free conditions and hardening upon exposure to moisture to form a rigid, self supporting structure. A flexible protective pad is positioned on one side of the substrate to provide cushioning between the substrate and the batter when the lower leg protector is being worn. An outer cover covers the substrate on the side opposite the protective pad. The substrate, protective pad and outer cover are connected together into a unitary structure for being molded while flexible to the lower leg and ankle of the batter. Complementary fasteners are attached to opposing side edges of the lower leg protector for retaining the lower leg protector in place on the batter's leg while being worn. A foot protector having an construction optionally provides protection to the top of the foot.

An ankle implant for use in ankle arthroplasty in total ankle replacement is provided. The implant includes an upper prosthesis anchored to the tibia and a lower prosthesis anchored to the talus. The lower prosthesis is operable associated with the upper prosthesis. The implant also includes a stem which is rigidly removably connected to the second member. The stem includes a portion for attachment to the calcaneous. The stem is be adapted to be in a first position in the calcaneous when the stem is in a first relative position with respect to the lower prosthesis, and to provide for a second position in the calcaneous when the stem is in a second relative position with respect to the lower prosthesis.

An ankle splint product includes an ankle splint for being custom-formed to the shape of an ankle while flexible and upon hardening providing a rigid, supporting custom fit. The ankle splint product includes an outer container formed of moisture-impervious material, and first and second flexible ankle splint segments positioned in the container in substantially moisture-free conditions and sealed therein against entry of moisture until use. Each of the first and second ankle splint segments includes an elongate substrate and a reactive system impregnated into or coated onto the substrate. The system remains stable when maintained in substantially moisture-free conditions and hardens upon exposure to moisture to form a rigid, self supporting structure. An elongate, flexible protective pad is positioned on one side of the substrate along its length to provide a cushioning barrier between the substrate and the skin of a patient when the ankle splint is in use. An elongate outer cover covers the substrate on the side opposite the protective pad. A flexible cushion insert has a first major surface overlying the protective pad and an opposing second major surface adapted for residing adjacent an ankle bone of the patient. The cushion insert cooperates with the protective pad to further protect and cushion the ankle of the patient when the ankle splint is in use.

A foot support for use with a human foot having a forefoot portion that supports the foot beneath the metatarsal heads and an arched midfoot portion that supports the foot beneath the metatarsal, cuneiforms, navicular, and cuboid bones and has a slope between a maximum height on the medial side of the foot support and a minimum height on the lateral side of the foot support. The foot support also includes a wedge fixed beneath the forefoot portion such that the maximum wedge height is positioned beneath the first metatarsal head and the minimum wedge height extends beneath the fourth metatarsal head. The foot support may optionally include a heel portion that supports the calcaneus and talus bones in a neutral, varus, or valgus positions.

The invention discloses the foot of a humanoid robot and a control method of the foot of the humanoid robot. The foot of the humanoid robot is characterized in that an upper disc body is arranged to serve as an ankle bone, the rear end face of the ankle bone is a plane, the front end face of the ankle bone is in a V shape when the front end face of the ankle bone is overlooked, an outer front end face body and an inner front end face body are symmetrically arranged on the V-shaped front end face, the ankle bone is supported in a three-force-point mode through three rod pieces on the rear end face and the front end face of the ankle bone, the three rod pieces refer to a heel bone, an inner metatarsal bone and an outer metatarsal bone, a rear planta pedis stress triangle is formed with the lower end of the ankle bone as a rear vertex and a point head facing backwards, and the upper end face of the ankle bone is connected with the lower limbs of the robot through ankle joints. According to the foot of the humanoid robot and the control method of the foot of the humanoid robot, linear driving devices are arranged on the lower limbs of the robot, all components are driven through flexible ropes according to set actions, and thus rotation of the foot joints of the robot is driven and controlled.

A Tibiotalar Arthrodesis Guide (TAG) used for fusion of the talus to the tibia is comprised of several basic components. The main component is a straight guide post upon which other components can slide. A curved arm is featured at the end of the straight guide post, featuring points at the ends which serve as indicators of the pins' exit sites based upon the lines of action of the parallel pins. The parallel guide cylinders are positioned on a movable arm which translates superiorly and inferiorly on the guide post of the handle, allowing a surgeon to adjust the device for varying ankle sizes. A “home-run” pin guide cylinder for a home-run guide pin is oriented superiorly and at an angle to the parallel guide cylinders. Using a similar concept as the parallel guide cylinders, the “home-run” guide is also attached to a movable arm that can translate inferiorly and superiorly along the main guide post. A medial guide cylinder for a medial guide pin passes through one of a plurality of holes in a vertical guide arm. The surgeon has the flexibility to utilize either the “home-run” or medial pins, depending on the needs of the patient and preference of the surgeon and, in either case, the “home-run” and medial pin pass between the two parallel pins.

A system for preparing an ankle bone to receive an ankle prosthesis is provided. The system includes a patient specific cutting guide that has an anterior surface, a posterior surface, and at least one cutting feature extending through the guide from the anterior surface. The posterior surface comprising a first protrusion or other member that extends from a first end fixed to the posterior surface to a second end disposed away from the first end of the first protrusion. The posterior surface has a second protrusion or other member that extends from a first end fixed to the posterior surface to a second end disposed away from the first end of the second protrusion. The first and second protrusions are spaced apart and have a length such that when the patient specific cutting guide is coupled with first and second bone references, which can include bushings implantable in bones, a clearance gap is provided between the posterior surface and the ankle bone.

A surgical kit suitable for repair of articular surfaces in the talocrural joint, includes: a surgical implant having a cap with an outer surface conforming to a talus dome surface and an inner surface having a central implant anchoring peg extending perpendicularly from said inner surface, a hollow tubular shell suitable for correct pre-drilling for implantation of the surgical joint implant in the dome of the talus, and a saw guide conforming and fixable to the lower portion of the tibia and providing saw guide surfaces in at least one plane, suitable for osteotomy of a lower portion of a tibia to expose the dome of the talus.

Patient-specific instruments for preparing bones for receipt of orthopedic prostheses, such as the distal tibia and the talus in a total ankle arthroplasty (TAA) procedure. A tibial guide and a talar guide are manufactured based on patient-specific anatomical data obtained using imaging technology, and each guide includes a surface conforming to selected anatomical surfaces or regions of the tibia or talus, respectively. Each guide includes at least one cut referencing surface, such as a cut slot, to guide a resection, and may also include a guide aperture sized to guide a reaming tool for reaming the distal tibia or talus. The guides may also include pin holes positioned within a periphery defined by the cut referencing surfaces such that, when the resections are made and the resected tibial bone portion or talus bone portion is removed, the guide and its associated pins are removed along with the resected bone portion.

The invention relates to a combination type ankle joint three-dimensional traction fixing frame. The fixing frame mainly comprises a horseshoe-shaped ring and four carbon fiber connecting rods. Three Kirschner pins are locked through pin locking screws, pass through heel bones, shin bones and metatarsal bones three-dimensionally and are fixed on the horseshoe-shaped ring and the four carbon fiberconnecting rods; and one or more ejector pins are locked through the pin locking screws to fix an inner ankle, an outer ankle and a rear ankle of an ankle bone. The fixing frame has a compact and stable structure, is convenient to use and detach and has low using cost, ankle joints and fracture blocks are firmly fixed, periosteum is not required to be stripped by a surgery, and the healing of damaged ankle joints is facilitated.

The invention discloses a plantar pressure measuring device and method for exoskeleton control. The device comprises a measuring device pressure shoe; four pressure sensors (202) are arranged inside the measuring device pressure shoe respectively at positions corresponding to metatarsal bones and ankle bones and generate micro weak electrical signals; a central processing unit acquires and processes the micro weak electrical signals; exoskeleton plantar pressure is measured by adopting a method of different weights aiming at different pressure sensor data in different modes. The plantar pressure measuring device and method disclosed by the invention have the benefits that the exoskeleton plantar pressure at a main forced part is acquired by utilizing the four thin film pressure sensors at a sole, so that the use of a large amount of sensors is avoided, the structure is simple, and the cost is low; the different modes when a wearer wear exoskeletons to stand and walk are divided, different processing is performed aiming at the data in the different modes, an algorithm is simple, the complicated processing of the data when a large amount of sensors are used is avoided, and the processing speed of the data is improved.