Tissue Protector for Minimally Invasive Surgery
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Solution Overview
Problem
Minimally invasive surgeries face challenges in protecting skin and soft tissues around incisions due to high pressure and frictional forces, which can lead to necrosis, discomfort, and increased risk of infection, especially during joint replacement procedures where visibility is limited and significant leverage is applied.
Innovation Solution
A tissue protector device comprising an abrasion-resistant sheet with an elongated opening and expandable features, or a system of interconnected links, designed to distribute forces and provide support around the incision, reducing pressure on tissues and preventing trauma from surgical instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If tissue retractors are used to stretch and expand the incision to improve visibility, then surgical site visibility is improved, but pressure on surrounding soft tissues increases to dangerous levels causing necrosis
Solution Approach 1:
A retractor system with a protective intermediary component is introduced between the retractor blades and the surrounding soft tissues. This intermediary layer distributes the retraction forces across a larger area and prevents concentrated pressure points that would otherwise cause tissue necrosis, while still allowing sufficient incision expansion for surgical visibility.
Solution Approach 2:
A flexible protective film or shell is applied to the surrounding soft tissues before retraction. This thin film acts as a protective barrier that distributes mechanical stresses and prevents direct contact between the retractor and vulnerable tissues, enabling safe incision expansion without tissue damage.
2Area of stationary object
If significant leverage is applied to stretch the incision and move soft tissues aside, then incision exposure is improved, but frictional and shearing forces cause tissue lacerations and necrosis
Solution Approach 1:
A protective barrier or cushioning layer is applied to the surrounding soft tissues before retraction begins. This pre-applied protection absorbs and distributes the frictional and shearing forces generated during incision expansion, preventing tissue lacerations and necrosis while allowing adequate exposure.
Solution Approach 2:
An intermediary protective layer is introduced between the retractor system and the soft tissues. This mediator reduces direct frictional contact and shearing forces during tissue manipulation, enabling safe incision expansion to the required exposure area without causing tissue damage.
3Loss of time
If the incision is kept minimal to reduce scarring and healing time, then cosmetic outcome and rehabilitation are improved, but surgical site visibility is insufficient for proper implant positioning
Solution Approach 1:
A protective intermediary system is introduced that enables safe incision expansion during surgery while maintaining the original minimal incision size. This allows sufficient visibility for proper implant positioning and bony landmark identification, yet the incision remains small enough to minimize scarring and accelerate healing and rehabilitation.
4Area of stationary object
If retractors are used to expand a 3 inch incision to 5-6 inches, then visibility is improved, but the pressure increases five times greater than the initial wound pressure causing necrosis
Solution Approach 1:
A flexible protective film is applied to the surrounding soft tissues during incision expansion. This film distributes the mechanical stresses across a larger area and prevents pressure concentration, allowing the incision to be safely expanded from 3 inches to 5-6 inches without causing the five-fold pressure increase that would lead to tissue necrosis.
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
The tissue protector effectively reduces the risk of tissue necrosis and discomfort by distributing forces and providing a protective barrier, allowing for safer and more effective minimally invasive surgical procedures with reduced risk of infection.
Implementation Method 1
The sheet has an adherent facing surface adapted to be applied to the surgical site surrounding the incision
Implementation Method 2
The expandable portion includes a pleat and can be configured to expand less toward the terminal ends of the opening
Data Source
AI summary
A tissue protector is adapted to be positioned on the skin surrounding an incision. The tissue protector provides a load bearing surface for surgical tools and instruments to prevent blunt force and pressure trauma to the skin and soft tissues within the incision. In one embodiment, the tissue protector is a sheet of wear-resistant material having an opening corresponding to the incision and expandable as the incision is retracted. In another embodiment, a tissue protector device includes a continuous expandable arrangement of interconnected L-shaped links. In still another embodiment, a one-piece tissue protector includes a flexible panel supported on the skin and a flexible sleeve extending into the incision. Yet another embodiment of the invention resides in a track that is supported about the incision. An instrument support platform is slidably mounted to the track to support a surgical tool relative to the incision.