Multifunction Retrieval Device Basket Forceps Integration

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Solution Overview

Problem

Existing retrieval devices, such as baskets and forceps, often damage tissue during object retrieval and may become stuck due to the object's size, requiring additional procedures for release and withdrawal.

Innovation Solution

A multifunction retrieval device with a handle and sheath assembly that includes a basket and forceps, allowing the forceps to pass through the basket in both contracted and expanded states, enabling secure object capture and release without tissue damage, and facilitating withdrawal by expanding the basket to accommodate larger objects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the basket is expanded to capture larger objects, then the retrieval capability is improved, but the basket cannot be withdrawn from the body lumen due to excessive diameter

Engineering Contradiction:

Improveretrieval capabilityVSAvoidbasket diameter

Core Design Contradiction:

Adaptability or versatilityVSLength of moving object

Solution Approach 1:

The basket is designed to dynamically change its diameter between expanded and contracted states. When expanded, it can capture large objects; when contracted, it can be withdrawn through the body lumen. This dynamic transformation resolves the contradiction between retrieval capability and withdrawability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The forceps are nested within the basket structure, allowing the forceps to pass through the basket in a contracted state and be deployed in an expanded state. This nested configuration enables both functions without requiring separate devices.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Adaptability or versatility

If the basket is expanded to capture objects, then the object capture capability is improved, but tissue damage occurs at the contact point

Engineering Contradiction:

Improveobject capture capabilityVSAvoidtissue damage

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The forceps act as an intermediary tool to capture objects without requiring the basket to directly contact and compress the object. The forceps can grasp the object gently while the basket provides structural support, reducing tissue damage.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The retrieval device is segmented into two functional components: the basket for structural support and positioning, and the forceps for actual object grasping. This segmentation allows each component to perform its function optimally without causing harm.

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If the forceps are used to grasp objects, then the object capture capability is improved, but the forceps may become stuck or require additional procedures for release

Engineering Contradiction:

Improveobject capture capabilityVSAvoidrelease procedure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The forceps and basket are merged into a single integrated device where the forceps can be freely inserted and removed from the basket. This integration simplifies the release procedure compared to using separate devices, as the forceps can be directly withdrawn through the basket's lumen without additional release mechanisms.

Inventive Principle:

Principle #5Merging (Combining)

4Device complexity

If a single retrieval device is used, then the device complexity is reduced, but the versatility to handle different object sizes is limited

Engineering Contradiction:

Improvedevice structureVSAvoidhandling different object sizes

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The device combines multiple functions in a single structure: the basket provides structural support and can be expanded for large objects, while the forceps provide versatile grasping capability for objects of various sizes. This multi-functionality achieves versatility without requiring multiple separate devices.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The device incorporates dynamic elements (expandable basket, deployable forceps) that allow it to adapt its configuration based on the object size and retrieval requirements, providing versatility while maintaining a relatively simple base structure.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10105153B2Multifunction retrieval devices and related methods

Publication Date: 2018.10.23 BOSTON SCIENTIFIC SCIMED INC

AI summary

A device may include a handle, and a sheath coupled to the handle. The sheath may include a lumen. The device may also include an instrument assembly coupled to the handle, and extending through the lumen of the sheath. The instrument assembly may include a basket configured to move relative to the sheath, and between contracted and expanded states. The instrument assembly may also include a forceps configured to reciprocate along a central longitudinal axis of the basket and through an interior of the basket, and move between contracted and expanded states.