Specimen Collection Bag Deployment Device with Spring Arms
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Solution Overview
Problem
Existing specimen retrieval systems in minimally invasive surgical techniques face challenges in efficiently deploying and closing collection bags within surgical cavities, particularly in maintaining the bag's openness during specimen collection and ensuring secure closure without interference from access cannulas.
Innovation Solution
A bag deployment device with spring arms and a drive rod system that allows for the controlled opening and closing of a collection bag within a surgical cavity, using a cinch loop pull string to secure the bag's opening and interface fingers to guide the bag through the cannula, ensuring the bag remains open for specimen collection and securely closed for retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the collection bag is inserted through the access cannula in a closed state, then the bag can be delivered to the surgical cavity, but the bag cannot remain open for specimen collection
Solution Approach 1:
The collection bag incorporates a dynamic opening mechanism with a biasing element (spring) that automatically transitions the bag from a closed inserted state to an open deployed state. The opening is held closed during insertion through mechanical constraint by the deployment device, then automatically opens upon deployment, allowing the bag to adapt to different operational phases without requiring separate opening/closing devices.
2Adaptability or versatility
If the collection bag is kept open during insertion, then specimen collection is facilitated, but the bag cannot be properly delivered through the access cannula
Solution Approach 1:
The bag is pre-loaded in a closed state within the deployment device before insertion. The deployment device mechanically constrains the bag opening in the closed position during entire insertion through the access cannula. Only after successful delivery and positioning does the bag transition to the open state, ensuring proper delivery is achieved first, then specimen collection capability is activated.
3Ease of operation
If a complex deployment mechanism is used to open and close the bag, then bag control is improved, but device complexity increases
Solution Approach 1:
The bag opening mechanism utilizes a self-activating spring-loaded system that automatically opens the bag upon deployment without requiring additional actuation steps. The biasing element stores mechanical energy during insertion (when the bag is constrained closed) and automatically releases it to open the bag, eliminating the need for separate opening commands or complex multi-stage control mechanisms.
4Reliability
If the access cannula interferes with bag closure, then secure closure is prevented, but specimen retrieval is compromised
Solution Approach 1:
The closure function is extracted from the access cannula environment and implemented as an integrated feature of the deployment device itself. The deployment device includes dedicated closure components (such as clamps or occluders) that actively seal the bag opening independent of the cannula's presence or interference, allowing reliable closure to be achieved despite the constrained surgical access environment.
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
Enables efficient deployment and closure of the collection bag within the surgical cavity, preventing specimen loss and ensuring secure retrieval by maintaining the bag's openness during insertion and closure, thereby facilitating effective specimen collection and removal.
Implementation Method 1
each spring arm having a substantially straight proximal portion, a curved intermediate portion and a distal tip
Data Source
AI summary
A collection bag and a bag deployment device for use in collecting an item such as a specimen during surgical procedure. The collection bag and bag deployment device forming an assembly adapted to deliver the collection bag through an access cannula into a surgical cannula. The assembly adapted to strip the collection bag from the distal end of the bag deployment device and cinch a cinch loop to close the open end of the collection bag.