Snare and Basket Tissue Collection Device
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Solution Overview
Problem
Existing tissue collecting devices lack a mechanism for efficiently and conveniently collecting tissue samples with a single operation, as they do not incorporate a snare mechanism to capture and contain the specimen effectively.
Innovation Solution
A tissue sample and snare device comprising a main tube with a flexible pull wire guide, a plunger, a specimen snare wire loop, and a basket wire loop, where the pull wire moves from an open to a closed orientation, allowing the snare wire to cut and the basket wire loop to capture the specimen, facilitating a single operation for collecting and containing tissue samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional tissue collecting devices are used, then the device structure is simple, but the ability to capture and contain tissue specimens effectively is insufficient
Solution Approach 1:
The device is divided into distinct functional segments: a snare mechanism for capturing the specimen and a basket mechanism for containing it. The snare includes a loop that can be cinched closed, while the basket provides a container structure with radial arms and a collection receptacle. This segmentation allows each component to perform its specific function reliably without requiring the entire device to be overly complex.
Solution Approach 2:
The snare mechanism is nested within the basket mechanism, with the snare loop positioned inside the basket structure. The pull wire for the snare passes through the basket assembly, allowing the snare to be deployed and operated within the confines of the basket framework. This nesting arrangement maximizes specimen capture reliability while maintaining a compact, integrated device structure.
2Ease of operation
If a single operation mechanism is implemented, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The snare closure mechanism and basket deployment mechanism are merged into a single integrated system actuated by one pull wire. When the operator pulls the wire, it simultaneously cinches the snare loop closed around the specimen and triggers the basket to deploy and contain the captured tissue. This combining of functions into a single operation greatly improves ease of use, and the integrated design allows the mechanisms to work together without requiring separate control systems.
Solution Approach 2:
The pull wire acts as an intermediary element that translates a single user action into coordinated movements of multiple components. The wire passes through guide elements and is attached to both the snare loop and the basket release mechanism, so that pulling it simultaneously activates both functions. This intermediary mechanism allows complex coordinated action to be achieved through a simple single-pull interface.
3Reliability
If durable construction materials are used, then the device reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The device employs homogeneous use of medical-grade polymers for the basket structure, snare components, and pull wire. This uniform material selection ensures consistent durability and biocompatibility across all components while simplifying the manufacturing process. The same base material can be used throughout with minimal variation, reducing the need for complex material handling, joining, or quality control procedures that would increase manufacturing costs.
Solution Approach 2:
The device utilizes composite construction combining polymer materials with metal reinforcement elements where needed, such as in the radial arms of the basket or the pull wire itself. This composite approach provides enhanced strength and durability in critical load-bearing components while keeping the overall device cost-effective by using materials only where necessary for structural integrity rather than throughout the entire assembly.
Data Source
AI summary
There is a main tube with a flexible pull wire guide with a pull wire slidably housed within. A plunger is slidably housed within the main tube, and moves from an open orientation to a close orientation. A specimen snare wire loop is fixedly attached to the end of the pull wire. A basket wire has a loop with an attached specimen basket. The specimen snare loop and the basket wire loop are aligned. The snare wire cuts the specimen, and the basket wire loop and net captures the specimen.