Retractor Blade Assembly Locking Mechanism
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Solution Overview
Problem
Most retractor blade assemblies lack the versatility to easily switch between a locked mode and an unlocked mode, limiting their multi-functional operation in surgical procedures.
Innovation Solution
A retractor blade assembly featuring a stem member with pin members and grooves that engage with a blade connector's apertures and notches, allowing for selective locking and unlocking of the retractor blade, enabling rotation in an unlocked mode and secure locking at a desired angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a retractor blade is designed with a fixed connection to the retractor body, then the blade maintains stable position during surgery, but the retractor lacks versatility to adapt to different surgical needs and positions
Solution Approach 1:
The retractor blade connection system transitions from a fixed static connection to a dynamic system that can switch between locked and unlocked states. The blade stem includes grooves that engage with a locking assembly, allowing the blade to be locked at specific angles or positions, or unlocked to allow rotation and adjustment. This dynamic capability provides versatility while maintaining structural integrity when locked.
Solution Approach 2:
The connection system is segmented into distinct functional components: the blade stem with circumferential grooves, the locking assembly with corresponding engagement features, and the blade connector body. This segmentation allows independent optimization of each component - the grooves provide locking positions, the locking assembly provides the locking mechanism, and the connector provides structural support - achieving versatility without excessive overall complexity.
2Reliability
If a retractor blade is made interchangeable and removable, then the retractor can adapt to different surgical applications, but the blade may become loose or detach during use
Solution Approach 1:
The blade connection system incorporates self-aligning and self-locking features. The grooves on the blade stem automatically align with the locking assembly engagement features during insertion, and the locking mechanism automatically secures the blade in place without requiring additional manual locking steps. This self-service approach ensures reliable locking while maintaining ease of operation.
Solution Approach 2:
The locking assembly acts as an intermediary between the blade stem and the connector body. It provides a controlled interface that allows easy insertion and removal of the blade while ensuring secure locking when engaged. The intermediary locking mechanism translates simple insertion motions into reliable locked states, bridging the gap between ease of operation and security.
3Ease of operation
If the retractor blade is locked at a fixed angle, then the surgical exposure is maintained precisely, but the surgeon cannot adjust the blade position to access different areas
Solution Approach 1:
The blade connection system provides dynamic positioning capability with discrete locked positions. The circumferential grooves on the blade stem engage with the locking assembly at specific angular positions, allowing the surgeon to adjust the blade to different orientations and then lock it in place. This enables transitions between different stable positions while maintaining precision at each locked position.
Solution Approach 2:
The locking mechanism provides periodic stable positions through the circumferential grooves spaced around the blade stem. Each groove represents a discrete locked position that the blade can assume. The surgeon can rotate the blade to different periodic positions and lock it, providing adjustable positioning while ensuring stability at each locked state. This periodic structure balances adjustability with positional stability.
Data Source
AI summary
A retractor blade assembly includes an arm member, blade connector and a retractor blade having stem member provided at the top of the blade. The stem member includes a first pin member, provided at an upper portion of the stem member. The first pin member has at least one abutment extending outward from the stem member, a first groove provided below the first pin member, a second groove provided below the first groove, provided about the circumference of the stem member, a second pin member having at least one abutment extending from the second groove. The blade connector cooperatively engages the stem member permitting the retractor blade to operate in a rotatable mode and a locked mode.