Tissue Splayer Pivot Mechanism for Low-Trauma Surgical Retraction
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Solution Overview
Problem
Conventional surgical retractors cause excessive force application leading to tissue deformity, reduced visual angle for surgeons, and strain on the surgeon's fingers, resulting in complications and repetitive strain injuries.
Innovation Solution
A tissue splayer device worn over the surgeon's gloves, featuring a splay mechanism that biases the angular separation of fingers to a predetermined position, allowing dynamic control and reducing the need for constant force application, while maintaining dexterity and providing improved visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surgical retractors are used to hold incisions open, then the incision remains open for surgical access, but excessive force is applied causing tissue deformity and trauma
Solution Approach 1:
The tissue splayer replaces static mechanical retractors with a dynamic system that uses the surgeon's own fingers as the actuating mechanism. The fingers naturally adjust their position and force application, allowing the incision to remain open while adapting to tissue characteristics and surgical needs in real-time, thereby reducing excessive force and tissue deformity
Solution Approach 2:
The patent introduces an intermediary device (the splay mechanism with pivot joints and biasing elements) between the surgeon's fingers and the tissue. This intermediary translates the surgeon's finger movements into controlled splaying action, providing mechanical advantage and force distribution that prevents excessive localized pressure on the tissue while maintaining incision patency
2Reliability
If conventional retractors are used to maintain incision open, then surgical access is provided, but the visual angle for the surgeon is reduced
Solution Approach 1:
The splaying mechanism divides the retraction function across multiple finger segments (index, middle, and ring fingers) rather than using a single large retractor. This segmentation allows each finger to independently control a portion of the incision opening, creating a more distributed visual field that maintains better surgeon visibility while still providing adequate surgical access
3Reliability
If the surgeon applies constant force with fingers to splay tissues, then tissue retraction is maintained, but the surgeon's fingers experience strain leading to repetitive strain injuries
Solution Approach 1:
The biasing elements (springs or elastic components) in the splay mechanism provide preliminary counteracting force that automatically maintains finger splay position. This preliminary anti-action reduces the need for the surgeon to apply constant muscular force, as the mechanical system continuously provides the counterbalancing force needed to maintain retraction, thereby preventing finger strain and repetitive strain injuries
Solution Approach 2:
The splay mechanism is designed to be self-maintaining through its biasing elements that automatically exert force to keep the fingers in the splayed position. The system serves itself by using stored elastic energy to maintain the retraction state without requiring continuous active input from the surgeon, reducing physical burden on the surgeon's fingers while maintaining reliable tissue separation
4Ease of operation
If finger splay is allowed without support, then natural finger movement is maintained, but excessive force application and tissue deformity occur
Solution Approach 1:
The pivot joints in the splay mechanism incorporate controlled resistance elements that modify the mechanical parameters of finger movement. These joints allow free movement in the splaying direction (away from the palm) while providing increasing resistance as the fingers approach neutral position, thereby guiding the surgeon's natural finger movements into a safe range that maintains dexterity while preventing excessive force application that could cause tissue deformity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces tissue trauma, improves surgical visibility, retains finger dexterity, and decreases the risk of long-term hand injuries by allowing controlled finger splay without immobilization.
Implementation Method 1
a first pivot joint coupling the index finger portion to the middle finger portion to permit the middle finger portion to rotate relative to the index finger portion about a first pivot axis
Implementation Method 2
a first splay mechanism configured to permit rotation of the middle finger portion away from the index finger portion about the first pivot axis, and to resist rotation of the middle finger portion towards the index finger portion about the first pivot axis
Data Source
Figure 1
Figure 2
Figure 3A~6B
AI summary
A tissue splayer (76) is described which includes an index finger portion (4) and a middle finger portion (5). The tissue splayer also includes a first pivot joint (80) coupling the index finger portion (4) to the middle finger portion (5) to permit the middle finger portion (5) to rotate relative to the index finger portion (4) about a first pivot axis (81). The tissue splayer (76) also includes a first splay mechanism (88) configured to permit rotation of the middle finger portion (5) away from the index finger portion (4) about the first pivot axis, and to resist rotation of the middle finger portion (5) towards the index finger portion (4) about the first pivot axis (81).