Intervertebral prosthetic disc placement and removal systems
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Solution Overview
Problem
Current intervertebral prosthetic disc placement and removal systems face challenges such as inadvertent changes in disc position during instrument disconnection, difficulty in disconnecting the instrument from the prosthetic disc due to interference with surrounding anatomy, and the need for over-distracting the disc space, leading to prolonged and unreliable surgical procedures.
Innovation Solution
A prosthetic disc placement instrument with grasping jaws that securely hold and easily release the disc, and a prosthetic disc ejector to disengage it from the instrument, along with a core removal instrument using distraction wedges to separate disc plates for easy core extraction, minimizing vertebral distraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If current placement instruments are used to hold and deliver prosthetic discs, then the disc can be inserted into the disc space, but the instrument is difficult to disconnect from the disc due to interference with surrounding anatomy
Solution Approach 1:
The placement instrument is divided into separate functional modules: a disc space preparation component, a disc delivery component, and a release mechanism. This segmentation allows each component to perform its function independently without interfering with surrounding anatomy during disconnection.
Solution Approach 2:
A temporary intermediary structure or mechanism is introduced between the placement instrument and the prosthetic disc that facilitates easy detachment. This intermediary allows the instrument to securely hold the disc during insertion but enables straightforward release without anatomical interference.
2Ease of operation
If the disc space is over-distracted to accommodate the prosthetic disc, then the disc can be inserted, but the procedure duration is prolonged and surrounding anatomy may be damaged
Solution Approach 1:
The disc space is prepared and sized appropriately before prosthetic disc insertion. The placement instrument is designed to deliver the disc in a pre-assembled configuration that matches the prepared disc space dimensions, eliminating the need for excessive distraction and reducing procedural time.
Solution Approach 2:
The placement instrument allows for adjustable parameters in disc delivery, enabling precise control over disc insertion force and angle. This ensures the disc is inserted without requiring over-distraction of the disc space, thereby reducing procedure time and minimizing damage to surrounding anatomy.
3Measurement precision
If the prosthetic disc is held securely by the placement instrument, then the disc can be delivered accurately, but the instrument may inadvertently change the disc position during disconnection
Solution Approach 1:
An intermediary release mechanism is introduced between the placement instrument and the prosthetic disc. This intermediary allows the instrument to maintain secure grip during delivery for accurate positioning, then facilitates smooth disconnection without altering the disc's final position through a controlled release action.
Solution Approach 2:
The placement instrument employs a dynamic grip mechanism that adjusts its holding force. During delivery, the grip is tight to ensure accurate positioning; during disconnection, the grip dynamically releases in a controlled manner to prevent inadvertent position changes to the disc.
4Productivity
If the prosthetic disc is implanted in an assembled configuration to reduce procedure duration, then surgical time is reduced, but the instrument must securely hold multiple components simultaneously
Solution Approach 1:
Multiple prosthetic disc components are pre-assembled into a single integrated unit before implantation. The placement instrument is designed to hold this pre-assembled configuration, reducing the need to manipulate multiple separate components during surgery and thereby reducing procedural time while maintaining manageable instrument complexity.
Data Source
AI summary
Embodiments of the disclosure provide systems and methods of removing a core from an intervertebral prosthetic disc. The method may include: securing a multipart prosthetic disc to a distal end of a removal instrument by grasping at least a portion of the multipart prosthetic disc between a pair of core removal arms on the placement instrument; inserting the pair of core removal arms between two prosthetic disc plates of the intervertebral prosthetic disc to distract the plates away from one another; and removing the core from the intervertebral prosthetic disc with the removal instrument. The removal instrument may include: an inner shaft connected to the pair of core removal arms; and an outer shaft movable with respect to the inner shaft and including an activation mechanism for causing the arms to grasp the core for removal.