Side-load Connector for Surgical Retractor Blades
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Solution Overview
Problem
Conventional surgical retraction devices lack efficient mechanisms for side-loading and angle adjustment of retractor blades, which can lead to obstructed views and deeper incision penetration during surgical procedures.
Innovation Solution
A retractor system with a swivel lock mechanism and angle adjustment assembly that allows side-loading of retractor blades and prevents them from rotating or swiveling when locked, while also featuring a ratcheted movement system to maintain retraction force and an angle adjustment mechanism using a thumb screw and ball configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional retraction devices are used without side-loading capability, then the structure is simpler, but the surgical view becomes obstructed and access to operative sites is limited
Solution Approach 1:
The retractor blade is separated from the retractor arm, allowing the blade to be independently positioned and angled. The blade can be side-loaded onto the arm, enabling flexible positioning without compromising the overall structural simplicity of the device.
Solution Approach 2:
The side-loading mechanism introduces an additional degree of freedom by allowing the blade to be attached laterally to the arm rather than only at the end. This enables the blade to be positioned at various angles and orientations, improving adaptability while maintaining a relatively simple connection structure.
2Ease of operation
If retractor blades are allowed to rotate freely, then positioning flexibility is improved, but the retraction force becomes unstable and the surgical view may be compromised
Solution Approach 1:
The swivel lock mechanism provides dynamic control over blade rotation. The blade can freely rotate when positioning is needed, and then be locked in place when stable retraction force is required. This dynamic transition between free rotation and locked positioning resolves the contradiction between flexibility and stability.
Solution Approach 2:
The swivel lock mechanism is designed to be self-retaining, where the blade's own weight and positioning create the locking condition. Once positioned, the blade naturally engages the lock without requiring additional active components, maintaining both flexibility and reliability.
3Manufacturing precision
If angle adjustment mechanisms are added to retractor arms, then positioning precision is improved, but the risk of deeper incision penetration increases
Solution Approach 1:
The ratcheted movement system allows the retractor arm to be advanced in controlled increments toward the operative site. The ratchet mechanism prevents backward movement, ensuring that once the desired position is reached, the arm cannot inadvertently penetrate deeper into the incision, thus eliminating the harmful effect while maintaining positioning precision.
Solution Approach 2:
The ratcheted mechanism provides mechanical feedback that limits the range of motion. The arm can only move forward in discrete steps and cannot reverse, providing inherent protection against over-penetration while allowing precise angular adjustment through controlled movements.
Data Source
AI summary
A retractor system includes a retractor blade and a retractor arm having a side-load connector. The side-load connector includes a port that passes through an upper surface and a lower surface of the side-load connector. A sidewall opening in the side-load connector permits lateral passage of the attachment post through a sidewall to the port. The side-load connector includes a cam pivotably coupled between the lower surface and the upper surface and a spring that applies a biasing force on the cam. The biasing force biases the cam to a closed position in which the cam extends into the opening and prevents unloading the attachment post from the port via the opening. The cam selectively engages either a first groove or a second groove of the attachment post sidewall. The side-load connector further includes teeth that engage teeth of the retractor body when the cam engages the first groove.