63 results about "Knees surgery" patented technology

There is provided a method and system for determining a distal cut thickness and posterior cut thickness for a femur in a knee replacement operation, the method comprising: performing a tibial cut on a tibia; performing soft tissue balancing based on a desired limb alignment; measuring an extension gap between the femur and said tibial cut while in extension; measuring a flexion gap between the femur and the tibial cut while in flexion; calculating a distal cut thickness and a posterior cut thickness for the femur using the extension gap and the flexion gap and taking into account a distal thickness and posterior thickness of a femoral implant; and performing said femoral cut according to the distal cut thickness and posterior cut thickness.

A system and method for aligning a patient's leg, for establishing the ultimate alignment of the leg prior to making a horizontal femoral cut or a horizontal tibial cut, for preparing the distal femur for receiving a femoral implant, and for making the horizontal, femoral and tibial cuts. The system and method incorporate a spacer, a cutting guide, and a template. The spacer is insertable between a distal femur and a proximal tibia to rotate the tibia with respect to the femur into the desired alignment. The cutting guide is engageable with the spacer, and can be fixed to the proximal tibia and the distal femur. The cutting guide has openings sized and shaped to guide a surgical saw to make the horizontal femoral cut and the horizontal tibial cut. The template is shaped to closely conform with the distal femur to allow the leg to be extended and to allow the procedure to be performed without dislocating a patella. Through one method of the present invention, the practitioner can select the desired ultimate alignment of the leg prior to making the horizontal, tibial and femoral cuts. As a result, when a replacement knee is implanted, the leg will be in the desired alignment.

A joint replacement kit for use in a joint replacement procedure replacing a portion of a body joint. The kit includes a cutting guide and a trial component wherein the cutting guide and trial component are packaged together. There is also provided a method for replacing a portion of a body joint. The method includes providing a joint replacement kit having a cutting guide and a trial component, positioning the cutting guide against an end portion of a bone, cutting the end portion of the bone with a cutting instrument, positioning the trial component to the cut end portion of the bone, and disposing of the cutting guide and trial component.

A computer-implemented method of planning orthopaedic surgery comprises providing a library of templates representing orthopaedic prostheses, displaying and scaling one or more patient images such as X-ray images, allowing a user to reconfigure geometrical constructs displayed over the images to match the construct to anatomical features shown in the image; and selecting one or more templates from the library in accordance with parameters of the reconfigured constructs. The templates correspond to the orthopaedic prosthesis or prostheses which are most suitable for the patient. Hip replacement surgery can be planned using a single patient image. Knee surgery can be planned using two patient images showing different views of the anatomical features, in which case geometrical constructs for use with each view are provided. The library of templates is accessible via the Internet so as to be accessible by users in any location and readily updateable.

The present invention provides for an apparatus for cutting a tibia, a stylus, an apparatus for cutting a femur, an apparatus for aligning a femoral cutting guide, and an ankle clamp in support of a unicondylar knee surgery. The present invention further provides for a method of preparing a femoral condyle of a femur for the implantation of a unicondylar femoral knee implant. The apparatus for cutting a tibia includes a unicondylar tibial resection guide that is adjustably connectable to a unicondylar tibial alignment guide and configured to operate concurrently with the tibial alignment guide. The apparatus for cutting a femur includes a spacer block and a cutting guide configured to operate concurrently with the spacer block.

Instrumentation for use in knee surgery comprises an intramedullary rod (10) for insertion into an end of a femur (100) and a distraction device (62) coupleable to the intramedullary rod (10) and operable between the intramedullary rod (10) and the tibia for adjusting the tension of the collateral ligaments on either side of the knee. A cutting guide (70) is configured to locate over an intramedullary rod (10) that has been inserted into an end of a femur (100), such that the position of the cutting guide (70) relative to the intramedullary rod (10), and therefore the femur (100), is adjustable in at least the anterior-posterior direction. A kit for use in knee surgery is provided and a method of adjusting the tension of the collateral ligaments on either side of a knee is taught.

The invention concerns monolithic foam sleeves that comprises titanium or titanium alloy foam having a porosity of 50 to 85% and possess a proximal end, a distal end, an interior wall that defines an interior channel and extends from the proximal end to the distal end; and a terraced outer surface that tapers such that said sleeve is widest at the distal end and most narrow at the proximal end.

A patient's leg is clamped into place for knee surgery by placement of the lower leg and foot in a leg receiving structure which is removably attached to a platform through the use of VELCRO closures. The platform is adjustably connected to a rail of an operating table. The leg receiving structure includes a foot holder, into which the foot is strapped, and a leg holder, into which a lower part of the leg is strapped. The leg holder is pivotally mounted on the foot holder, so that the foot may be flexed as the foot holder is moved among various positions on the platform.

A femoral tibial spreader (100) for spreading adjacent bones includes a radial measurement gauge (111) for providing incidia corresponding to an amount of force being applied to the forward ends (105,106) of the femoral tibial spreader (100). The femoral tibial spreader (100) may be used, for example, to separate the femur (301) and tibia (302) during knee surgery. The radial measurement gauge (111) may be used to determine an amount of force being applied to the femur (301) and tibia (302), for example, by the medial and arterial ligaments. Two handle members (104,109) are squeezed together, which causes the forward ends (105,106) to open. A biasing member (110) allows a measurement extension (108) to pivot towards a handle member under tension, thereby providing a measurement of force applied by the ligaments.

An apparatus and method for preparing a tibia for knee surgery. The apparatus includes a tibial base having a center axis, and a handle coupled to the base at an anterior base location that is offset relative to the center axis.

A system for resecting a tibia and femur during arthroplasty includes anchoring devices, a three-way alignnment guide attachable to an anchoring device. The alignment guide provides for locating a resection guide in three degrees of freedom, including one translation and two rotations. The resection guide is coupled to a computer navigation system.

Disclosed herein are improved methods, apparatus and / or systems for a tibial implant assembly that can facilitate balancing, positioning, insertion, locking and maneuvering of the modular tibial inserts during knee surgery. The system may include a plurality of modular tibial inserts with locking or engagement mechanisms that allow creation of a modular insert assembly, and a corresponding tibial tray and optional tray components. The system allows the quick and convenient mating and locking of the tibial insert assembly to the tibial tray. The various components can accommodate mobile-bearing and fixed-bearing designs for the tibial tray.

A femoral distractor includes a top post for positioning under a patient's knee and a bottom pin for fixed attachment to a hospital bed rail. A vertical rod extends between the top post and horizontal bottom pin to move the knee joint in the vertical direction upon operation of a trigger assembly.

A system of surgical instruments for use with at least a first implant and a second implant of the same type but different sizes is provided. The system includes a first container containing at least a first surgical instrument of a first type that is size specific and a second surgical instrument of a second type that is size specific; a second container containing at least a third surgical instrument of the first type and a fourth surgical instrument of the second type, wherein both the third and fourth instruments are of a second size that is different from the first size and that corresponds to the second implant; and a third container containing at least a fifth surgical instrument of a third type that is size independent.

A device for rehabilitating a knee after knee surgery includes a support adapted to support the leg at the popliteal fossa while allowing the knee to be bent about the support with little interference from the support. A method of knee rehabilitation includes the step of supporting the patient's leg on the support and allowing the patient to control to movement in order to overcome muscle guarding. The support is carried by uprights that are spaced apart far enough to allow the patient to be positioned on his back between the uprights with the knee to be rehabilitated disposed over the support and the other leg stretched straight under the support.

Tools may be used individually and / or in combination to allow minimally invasive and safer orthopedic surgery. A femur adjustment tool lifts and lateralizes the proximal end of the femur during hip replacement surgery by pivoting on a ball temporarily placed in the acetabulum. A tissue protection and broach (rasp, cutting, drilling) guide tool may retract tissue at the incision, protect tendons and soft tissue, and provides a curved, elongated surface that cradles and guides the broaching tool. A tip of the main body of the protection and guide tool, and a hook protruding from the main body, may extend along opposite surfaces of the femur to help “capture” a portion of the femur for tool stability and to effectively and positively protect the piriformus tendon that will reside in the “V” between the hook and tip. A bone clamp is used when a generally transverse cut is made across a bone, for example, a knee surgery proximal tibial cut, wherein the clamp improves control of the bone portion for safer freeing of the bone portion from soft tissue and extracting the bone portion from the incision. A broad, flat plate of the bone clamp may be slid between the bone and the bone portion into the narrow space that has been created by cutting the bone, and a relatively narrow gripping member may be slid along / across the opposing surface of the bone portion, which allows the narrow gripping member to fit into the intercondylar notch of the femur.

The present invention includes a rehabilitation apparatus that can assist a patient that has been impaired, injured / traumatized, or subject to degenerative conditions in his or her lower limbs. The apparatus may be designed to exercise the extension and flexion movements for a patient's leg after knee surgery. A thigh support link may be connected to an upper leg link, which is connected to a lower leg link for supporting the patient's leg during the extension and flexion range of movements. A foot plate with wheels may be connected to the lower leg link, and the wheels enable the foot plate to slide along a base as the patient moves in both directions. A sled or connector provides a flexible connection between the thigh support link and the base, which allows the thigh support link to travel along the base in conjunction with the foot plate wheels. The present invention provides adjustable, constant resistance as the extension and flexion exercises are done. In some embodiments, the resistance may be different for the extension and flexion ranges of motion. The resistance may be applied through the connection of the sled or connector to the base. This can be done with direct or magnetic resistance mechanisms. In one embodiment, one or more b-motors or magnetic clutches are used to provide magnetic resistance.

This invention is a device and a method for preparing a knee joint for a prosthesis in a patient undergoing TKA surgery for any knee implant (prosthesis). The device and the method are used in a universal and an open platform fashion for any currently available knee implant, all patient specific implants and any knee implants that could be produced in future.The device is a patient specific instrument, which is based on a method comprising of image based (CT, MRI or computed X-ray) 3-D preoperative planning to design the templates (PSI) that are used to perform the knee surgery for any knee implant in a universal and open platform fashion.

The invention provides a degradable gasket with anti-bacterial anti-adhesion performance. The degradable gasket is prepared via weaving or knitting of a plurality of bundles of magnesium-based metal wire, or via punching of magnesium-based metal sheets. The magnesium-based metal wire can be made of pure magnesium or a magnesium-based alloy of different elements based on disease characteristics and treatment requirements. The degradable gasket possesses excellent biocompatibility; in vivo degradation and absorption can be realized; degradation speed can be controlled; the degradable gasket is capable of preventing postoperative adhesion and infection, and promoting wound healing, can be used for preventing epidural adhesion after orthopedic surgery laminectomy, adhesion after tendon rupture repairing operation, adhesion after knee surgery, dura adhesion after transcranial surgery, eye socket soft tissue adhesion, intestinal adhesion after abdominal surgery, and intrauterine adhesion, is capable of reducing infection risk of the above surgeries, and possesses significant clinical application value.

A device for positioning a tibial tunnel during ACL reconstruction, the device that includes an elongated body having proximal and distal ends; and a distal arm extending from the distal end of the elongated body, a distal portion of the distal arm being configured for insertion into a pre-formed opening in a femur. The distal arm and the body are not aligned relative to each other when viewed from above. A pair of such devices, providing tunnel positioning for right and left knee surgeries, maybe provided in a set.

The invention relates to a customized compound bone cutter for femoral condyle which is used for cutting the bone of the femoral condyle in knee surgery. The customized compound bone cutter for femoral condyle comprises a paracondyloid positioning surface, a remote-end positioning surface, a paracondyloid fixing hole, a paracondyloid fixing inclined hole, a remote-end fixing inclined hole, a force line inspection line, a femoral condyle prosthesis positioning hole, a femoral condyle remote-end bone cutting groove, a paracondyloid bone cutting groove, a front inclined-surface bone cutting groove, a hypocondyle bone cutting groove, a rear inclined-surface bone cutting groove and an intercondylar bone cutting groove; the femoral condyle model number is determined by virtue of preoperative planning based on the CT data of a patient, and then the contact surface, the fixed point and each cutting surface can be determined; the customized compound bone cutter for femoral condyle has the advantages that various parameters are more accurate, the used operating tools are greatly reduced, the operating time is greatly shortened, the infection risk is reduced, pulp exposing is avoided, wound is reduced, and the dependency on the experience of a doctor is reduced; as a result, the customized compound bone cutter for femoral condyle is especially suitable for operations not suitable for conventional operating tools.