Loudspeaker-Shaped Tissue Cutter Stent for Minimally Invasive Resection
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Solution Overview
Problem
Current minimally invasive surgical instruments require large incisions and general anesthesia, leading to extensive tissue resection and prolonged recovery due to reliance on human eyes for lesion identification, which results in damage to normal tissues and organs.
Innovation Solution
A tissue cutter with a radially expandable loudspeaker-shaped stent and reefing thread system that allows for precise resection and closure of tissues through a small incision, enabling accurate lesion removal without general anesthesia and minimizing tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple instruments are inserted through a large incision to perform surgical resection, then the resection capability is improved, but the incision size and tissue damage increase
Solution Approach 1:
The tissue cutter employs a nested structure where the stent is inserted within a delivery catheter, and the cutting elements are contained within the stent structure. This nesting allows multiple functional components to be delivered through a single small incision (2-3mm) rather than requiring multiple separate instruments through a large incision, thus resolving the contradiction between resection capability and incision size
Solution Approach 2:
The tissue cutter integrates multiple functions into a single device: the stent provides structural support and defines the resection boundary, while the cutting elements perform tissue resection, and the delivery catheter enables minimally invasive insertion. This multi-functionality eliminates the need for multiple separate instruments (forceps, scissors, hooks) and achieves versatile resection capability through a single small incision
2Reliability
If extensive resection is performed to ensure complete lesion removal, then the reliability of lesion resection is improved, but the damage to normal tissues increases
Solution Approach 1:
The tissue cutter applies local quality by creating a precisely defined resection zone using the stent structure. The stent acts as a template that confines the resection to only the necessary area, allowing complete lesion removal while sparing surrounding normal tissues. This localized approach ensures reliable lesion resection without the need for extensive margin resection that would damage healthy tissue
3Ease of operation
If a large incision is made to insert surgical instruments, then the surgical access is improved, but the recovery time increases
Solution Approach 1:
The tissue cutter divides the surgical system into separable components: a reusable delivery catheter and a disposable stent with cutting elements. This segmentation allows the complex resection function to be delivered through a simple small incision via the catheter, providing adequate surgical access while minimizing the incision size to accelerate patient recovery
Data Source
Figure 1~3
Figure 4A~4B
Figure 4C
AI summary
The present invention discloses a tissue cutter. The tissue cutter comprises: a tissue cutting stent (1, 1', 1") and a first reefing thread (5). The tissue cutting stent (1, 1', 1") is expandable in a radial direction. The expanded tissue cutting stent (1, 1', 1") is loudspeaker-shaped gradually opening from a proximal end to a distal end, and a loudspeaker-shaped accommodating space is formed inside the expanded tissue cutting stent (1, 1', 1"). The tissue cutting stent (1, 1', 1") is provided with a plurality of first threading holes (50, 50' ) at the distal end, and the plurality of first threading holes (50, 50') is arranged along a circumferential direction of the tissue cutting stent (1, 1', 1"). The first reefing thread (5) passes through the plurality of first threading holes (50, 50' ). The first reefing thread (5) has opposite first and second ends. The first end is secured to a starting threading hole in the plurality of first threading holes (50, 50' ). The tissue cutter is used to resect lesioned tissues with a minor incision and accurate resection area. Accordingly, the use of the tissue cutter to perform a minimally invasive surgery can preserve more normal tissues and organs, and resect the lesions in patient's body more minimally invasively and accurately.