Surgical Guiding Instrument with Adjustable Depth Stop
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Solution Overview
Problem
Existing surgical guiding instruments for intervertebral implants require adjustment of the stop device before insertion, necessitating removal from the patient's body or invasive access, making minimally invasive surgery challenging.
Innovation Solution
A surgical guiding instrument with a stop device actuated by an actuating member at the proximal end, allowing for adjustable insertion depth via a power transmission member, enabling adjustment from outside the body and preventing over-insertion into the spinal canal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stop device is arranged directly at the distal end of the instrument, then the insertion depth can be delimited, but the stop device can only be adjusted before insertion requiring removal from the patient's body
Solution Approach 1:
The instrument is divided into modular components: a shaft with the stop device at the distal end, and a separate actuating member at the proximal end. This segmentation allows the stop device to remain fixed for reliable depth control while the actuating member enables adjustment without removing the instrument from the patient's body.
Solution Approach 2:
A power transmission member acts as an intermediary between the actuating member and the stop device. This intermediary transmits mechanical force from the proximal actuating member to the distal stop device, enabling remote adjustment of the insertion depth limit while the instrument remains in place.
2Object-affected harmful factors
If the guiding instrument is inserted through minimally invasive access, then patient trauma is reduced, but the stop device cannot be adjusted after insertion
Solution Approach 1:
By separating the actuating function from the stop device function and placing them at opposite ends of the shaft, the instrument maintains minimally invasive access benefits while enabling post-insertion adjustment through the long shaft.
Solution Approach 2:
The power transmission member serves as a mediator that transmits adjustment forces through the length of the shaft, allowing the operator to adjust the stop device from the proximal end without requiring access at the distal end or removal of the instrument.
3Device complexity
If the actuating member is connected permanently to the shaft, then the structure is simpler, but cleaning and maintenance become difficult
Solution Approach 1:
The actuating member is designed as a separable component from the shaft, allowing the instrument to be disassembled for thorough cleaning and maintenance. The segmentation provides access channels and surfaces that would be inaccessible in a permanently connected design.
Solution Approach 2:
The actuating member is designed to be interchangeable with different shafts, allowing a single actuating member to work with multiple shafts of different specifications. This universal design simplifies maintenance by allowing components to be replaced or cleaned independently.
Data Source
AI summary
A surgical guiding instrument for use with a chisel and an implant body for insertion into an intervertebral space, included is a shaft with a stop device for delimiting a depth of insertion of the implant body into the intervertebral space. The shaft has a distal end and a proximal end, the implant body being arranged at the distal end of the shaft and defining two bearing surfaces positionable against the adjacent vertebral bodies, the stop device having at least one stop movably mounted at the distal end of the shaft or on the implant body, the stop having a stop surface pointing in distal direction transversely or substantially transversely to at least one of the bearing surfaces, so that an insertion depth for a surgical machining tool can be set in a simple way.