Spinal Retractor with Radially Translatable Blades
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Solution Overview
Problem
Current retractor devices for spinal surgery do not provide adequate access to the surgical site and fail to effectively clear tissue obstructions, especially at deeper levels, limiting the surgeon's ability to perform procedures with minimal disruption to spinal muscles and sensitive elements.
Innovation Solution
A retractor device with radially translatable blade holders and an actuator handle that uses a cable system to expand and retract blades, allowing for controlled tissue exposure with minimal disruption, featuring a ratcheting mechanism for incremental expansion and a halo structure for instrument manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional retractor devices are used for spinal surgery, then the surgical site can be exposed, but the surgeon does not have adequate access to deeper tissue obstructions and cannot clear obstructions at deeper levels
Solution Approach 1:
The retractor device is segmented into multiple functional components: a head portion with blade holders for tissue retraction, a body portion with a hollow center for instrument passage, and a handle portion with actuators. This segmentation allows the device to simultaneously perform superficial retraction while enabling access to deeper structures through the hollow center, resolving the contradiction between surface exposure and deep access capability
Solution Approach 2:
The hollow center portion of the retractor body is designed to nest and accommodate surgical instruments, suction devices, or irrigation tools within its structure. This nested configuration allows deeper tissue obstructions to be cleared through the hollow center while the outer blade holders maintain retraction of superficial tissues, enabling both functions simultaneously
2Ease of operation
If the surgical area is enlarged to allow ample access, then the surgeon can perform procedures more easily, but tissue disruption increases
Solution Approach 1:
The retractor blades are designed with differentiated local qualities - the leading edges feature sharp cutting surfaces for precise tissue separation, while the body portions have smooth contours that minimize trauma to retracted tissues. This localized optimization allows adequate surgical exposure while reducing overall tissue disruption to muscles and sensitive spinal elements
Solution Approach 2:
The blade holders are configured to be radially translatable, allowing dynamic adjustment of blade position and retraction force during surgery. This dynamic capability enables the surgeon to optimize exposure as needed while minimizing tissue disruption by adjusting retraction intensity rather than requiring fixed, aggressive retraction
3Stability of the object's composition
If a rigid retractor structure is used to maintain stability, then the surgical site remains secure, but instrument manipulation from inside the retractor becomes difficult
Solution Approach 1:
The retractor is segmented into a stable outer framework (head and body portions) that maintains surgical exposure, and a separate accessible interior space (hollow center) that accommodates instrument manipulation. This segmentation allows the external structure to remain rigid for stability while the internal hollow space provides freedom of movement for surgical instruments
Solution Approach 2:
The hollow center portion acts as an intermediary space between the stable outer retractor structure and the surgical instruments. This intermediate chamber allows instruments to be manipulated, passed, and positioned within the retractor without compromising the stability of the outer framework, facilitating both stability and instrument accessibility
Data Source
AI summary
A retractor is disclosed. The retractor includes a housing, at least one blade holder slidably coupled to the housing, and an actuator handle to control sliding movement of the blade holder. The blade holder and the actuator handle hold at least one blade.