System, method and tool for ensuring correct insertion of an artificial hip joint
AssigneeOrthoMeter A/S
InventorBjorn Iversen
Life of this patent
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Abstract
A system for ensuring correct insertion and spatial orientation of a prosthesis cup and/or a prosthesis neck of an artificial hip joint is described. The system comprises a tool (30) for controlling the mutual positioning of the main components in a femoral prosthesis; a measuring device (40) for measuring the distance between two supports (2, 2′) connected to the patient s pelvis and femur; and a positioning tool (1) designed to be releasably connected to a handle part (14) connected to the tool according to item a) and to the two supports connected to the patients pelvis and femur. A measuring device and a positioning tool included in the system is also described in addition to a method for surgery by means of the present tools.
Claims22
A system for ensuring correct insertion and spatial orientation of a prosthesis cup and/or a prosthesis stem of an artificial hip joint, the system comprising:
- a) a tool (30) for controlling the mutual positioning of the main components in a hip prosthesis;
- b) a measuring device (40) for measuring the distance between two supports (2, 2′) connected to the patient's pelvis and leg;
- and
- c) a detachable positioning tool (1) designed to be connected to a handle part (14) connected to the tool (30) according to item a) or to extensions of the prosthesis components, and to the two supports (5, 5′) connected to the patients' pelvis and leg.
Measuring device for measuring the distance between two supports (5, 5′) for use during surgical procedures, where said supports are connected to bones in the patient's body, wherein the measuring device comprises
- an elongated main body (41);
- a first arm (43) connected substantially perpendicular to the longitudinal axis of and close to one end of said main body;
- an adjustable member (42) displaceably connected to said main body (41), a second arm (48) being substantially parallel to said first arm (43), connected to the adjustable body (42);
- connection members (46, 47) arranged at one of the ends of said first (48) and second arm (43), where said connection members are adapted to interact with receptors (5, 5′) at the supports (2, 2′).
A positioning tool (1) for ensuring correct insertion of a prosthesis cup and/or a prosthesis stem of an artificial hip joint, the tool comprising:
- a handle part (14) adapted to be releasably connected to a tool (30) for controlling the mutual position of the main parts (31, 32) of a hip prosthesis;
- and
- two or more flexible arms (7, 7′), where each arm close to a first end thereof, is adapted to be releasably connected to said handle part (14) and close to a second end thereof, is connected to a connection member (6, 6′) that is adapted to interact with receptors (5, 5′) at the supports, and where the flexible arms (7, 7′) comprise means to lock the arms in a wanted configuration.
A method for ensuring correct positioning of the main parts of an artificial hip joint, i.e. an prosthesis stem and a cup, wherein the method comprises the following steps:
- r) placing the patient in a well defined start position;
- s) preparing for fixation of supports to the patient's femur and pelvis, respectively,
- t) fixation of—said supports to the patients leg and pelvis;
- u) measuring the mutual position of said supports by means of a measuring device while the patient lies in said well defined start position;
- v) making the necessary incisions, dividing the femoral neck, preparing the femur and pelvis for receiving the prosthesis parts;
- w) inserting the prosthesis stem into the femur and the cup both without or together with cement to fasten them into the femur and pelvis using the tool for ensuring mutual position of the parts of the prosthesis to ensure correct mutual positioning;
- x) replacing the patient in said well defined start position and controlling the position by means of said measuring device;
- y) in procedures where cement is used for fixation, waiting until the cement is sufficiently hardened to remove the tools;
- z) removing the tool for ensuring the correct mutual position and reassembling the prosthesis and finalizing the surgical procedure the conventional way.
Dependencies are inferred from the claim text.