Positioning device of a surgical instrument for hip arthroplasty surgery
Inventors
Siccardi, Francesco • Bernardoni, Massimiliano • TROMBETTA, Christian
Assignees
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Publication Number
US-12208022-B2
Publication Date
2025-01-28
Expiration Date
Abstract
Various implementations include a positioning device of a surgical instrument for hip arthroplasty surgery that includes an arched structure having a first and a second end, wherein the first end can be positioned inside a patient, a gripping element located at the second end of the arched structure, a surgical instrument that can be coupled to the gripping element at a seat made in this gripping element, and a positioning and fixing head arranged at the first end of the arched structure.
Core Innovation
The invention relates to a positioning device configured to direct and orient a surgical instrument toward an acetabular cup during an operation to reposition and/or replace a hip joint, including total hip arthroplasty. An arched structure has a first end configured to be positioned inside a patient and a second end, and a positioning and fixing head is rotationally coupled at a fixed end to the first end of the arched structure.
At the second end, a gripping element is arranged and is slidably movable along a portion of the arched structure aligned with a longitudinal axis of the gripping element and including the second end. The gripping element defines a slot extending through the gripping element transverse to the longitudinal axis of the gripping element, the slot configured for receiving the surgical instrument, and the gripping element and the seat support orientation of an instrument stem, including a substantially transverse orientation relative to the longitudinal axis of the gripping element.
The positioning and fixing head includes connection means facing toward the gripping element, and its free end is movable relative to the arched structure out of a first plane that extends through the arched structure, the gripping element, and the fixed end of the positioning and fixing head. In described refinements, the positioning and fixing head is tilt-angle adjustable relative to the arched structure, and the surgical instrument stem is adjustable with a defined insertion angle relative to the gripping element, with a graduated scale included for angle verification.
The device is positioned to guide instruments toward the acetabular cup in a superolateral approach without obstructing the surgeon’s field of view and is described as improving stability by direct fixation to the femur. The described workflow and interoperability include multiple interchangeable heads/tools, and the device is coupled to a temporary femoral stem in the femoral canal.
Claims Coverage
The provided material includes two independent claims (independent_claim_id clm-00001 and independent_claim_id clm-00016). The main inventive features concern an arched positioning architecture with a patient-positionable first end, a slidably movable gripping element with an instrument-receiving slot or seat, and a positioning and fixing head with specific plane/rotational mobility and connection means toward the gripping element.
Arched positioning structure with patient-positionable first end
An arched structure having a first end and a second end, the first end configured to be positioned inside a patient.
Slidably movable gripping element at the second end with transverse instrument slot
A gripping element arranged at the second end of the arched structure, the gripping element being slidably movable along a portion of the arched structure aligned with a longitudinal axis of the gripping element and including the second end, the gripping element defining a slot extending through the gripping element transverse to the longitudinal axis, the slot configured for receiving the surgical instrument.
Rotationally coupled positioning and fixing head with free end rotatable about the longitudinal axis
A positioning and fixing head rotationally coupled at a fixed end thereof to the first end of the arched structure such that a free end of the positioning and fixing head is rotatable about a longitudinal axis of the first end, wherein the free end is spaced apart from and opposite the fixed end along a longitudinal axis of the positioning and fixing head.
Head connection means facing toward the gripping element
The positioning and fixing head comprises a connection means that faces toward the gripping element.
Out-of-plane movable free end relative to a first plane
The free end of the positioning and fixing head is movable relative to the arched structure out of a first plane that extends through the arched structure, the gripping element, and the fixed end of the positioning and fixing head.
Seat receiving the instrument stem and enabling separate rotation of gripping element
A positioning device wherein the gripping element comprises a seat configured to receive a stem of the surgical instrument such that the stem is oriented substantially towards the positioning and fixing head and is transverse to the longitudinal axis of the gripping element, and the gripping element is coupled to the second end such that the gripping element, together with the seat, is separately rotatable about the longitudinal axis of the gripping element without a corresponding rotation of the arched structure.
Connection means between positioning and fixing head and the arched structure
A positioning and fixing head being coupled to the first end of the arched structure, wherein the positioning and fixing head comprises connection means that face toward the gripping element.
Across the two independent claims, the patent coverage centers on an arched structure with a patient-positionable first end and a second end carrying a slidably movable gripping element that defines a transverse slot or includes a seat for receiving an instrument stem. A positioning and fixing head is rotationally coupled to the first end with connection means facing toward the gripping element, and its free end is movable relative to a defined first plane. In the second independent claim, the seat orients the stem toward the head transversely and the gripping element, with the seat, is separately rotatable about the gripping element longitudinal axis without corresponding rotation of the arched structure.
Stated Advantages
Guides instruments toward the acetabular cup in a superolateral approach without obstructing the surgeon’s field of view.
Improves stability by direct fixation to the femur.
Documented Applications
Positioning and orienting a surgical instrument during an operation to reposition and/or replace a hip joint, including directing instruments toward an acetabular cup.
Use in total hip arthroplasty (THA) including a superolateral approach.
Use with a temporary femoral stem in the femoral canal and described interoperability with multiple interchangeable heads/tools.
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