Medacta Group has filed a patent for a tibial-femoral trial implant that includes a graduated reference system. The system indicates the relative angular deviation between the femoral trial insert and the tibial trial insert during knee movement. This implant aims to improve knee extension and flexion positions. GlobalData’s report on Medacta Group gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Medacta Group, Prosthetic cardiac valves was a key innovation area identified from patents. Medacta Group's grant share as of September 2023 was 59%. Grant share is based on the ratio of number of grants to total number of patents.

A tibial-femoral trial implant with graduated reference system

Source: United States Patent and Trademark Office (USPTO). Credit: Medacta Group SA

A recently filed patent (Publication Number: US20230310180A1) describes a tibial-femoral trial implant for knee surgeries. The implant consists of a femoral trial insert and a tibial trial insert. The femoral trial insert has a medial condyle and a lateral condyle, while the tibial trial insert has a medial plate and a lateral plate.

The key feature of this implant is the inclusion of a graduated reference system that indicates the relative angular deviation between the femoral trial insert and the tibial trial insert. This reference system is designed to measure the movement of the femoral trial insert from a knee extension position to a knee flexion position. It does so by utilizing a vertical axis passing through the center of a sphere defining the medial condyle of the femoral trial insert.

The tibial trial insert has a flat lower surface and an upper surface that defines a tibial plate. The vertical axis used in the reference system is orthogonal to the lower surface of the tibial trial insert. The medial plate of the tibial trial insert has a concave articular surface that matches the convex articular surface of the medial condyle of the femoral trial insert. This allows the medial plate to house the sphere defining the medial condyle.

The graduated reference system includes a plurality of reference marks on the medial plate of the tibial trial insert. These marks extend from the upper surface to the front surface of the plate. Additionally, there is a notch on the anterior surface of the medial condyle of the femoral trial insert. This notch is formed by the intersection of the anterior surface and a plane passing through the center of the sphere defining the medial condyle. The plane is orthogonal to the inferior surface of the tibial trial insert.

The reference marks on the medial plate include a central notch that aligns with the notch on the femoral trial insert. There are also multiple lateral notches equally spaced on both sides of the central notch. Each lateral notch is separated from the adjacent notch by an angular width of 5°, resulting in an overall interval width of ±20° with respect to the central notch.

The alignment of the notch on the femoral trial insert with one of the lateral notches on the tibial trial insert allows for the measurement of the angular deviation of the femur with respect to the tibia during a flexion movement.

Overall, this patent describes a tibial-femoral trial implant with a graduated reference system that provides a means to measure the relative angular deviation between the femoral and tibial trial inserts during knee flexion. This implant has the potential to improve the accuracy and precision of knee surgeries.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies