Laparoscopic Retrieval Bag Unrolling Mechanism
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Solution Overview
Problem
Existing retrieval bags used in laparoscopic surgery often face difficulties in reliable and simple unrolling, especially in tight spaces, which can lead to incomplete unrolling and hinder access to the main bag opening.
Innovation Solution
A flexible unrolling pulling means is attached to the bag bottom, accessible from the outside, and is longer than the distance between its fixing point and the main bag opening. This pulling means is rolled up with the bag to ensure that its free end protrudes from the bag roll, allowing for easy unrolling by pulling on the free end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the retrieval bag is rolled up from the main bag opening perpendicular to the spring wire ellipse, then a compact bag roll is formed, but the unrolling process becomes complex and unreliable in tight spaces
Solution Approach 1:
Instead of rolling the bag from the main opening perpendicular to the spring wire (conventional approach), the invention rolls the bag from the bottom edge parallel to the spring wire ellipse. This inversion of the rolling direction and approach simplifies the unrolling process by eliminating the need for the bag to rotate around the spring wire loop, making it reliable even in tight surgical spaces.
2Device complexity
If the spring wire acts as both a closure and an opener, then device complexity is reduced, but reliability decreases due to potential errors in dual-function operation
Solution Approach 1:
The invention separates the functions of the spring wire and the unrolling mechanism. The spring wire ellipse serves solely as a closure element that can be deformed for insertion, while the unrolling is achieved by rolling the bag from the bottom edge parallel to the spring wire. This segmentation eliminates the complexity and reliability issues of the dual-function spring wire approach.
3Volume of moving object
If the bag is rolled up tightly to minimize volume, then insertion into the abdominal cavity is facilitated, but access to the main bag opening may be hindered during unrolling
Solution Approach 1:
The bag is pre-oriented during rolling so that the bottom edge (where the spring wire ellipse is attached) becomes the leading edge when inserted into the abdominal cavity. This preliminary arrangement ensures that when the bag is unrolled, the main bag opening is already positioned and accessible at the distal end, eliminating the need to rotate or manipulate the bag during unrolling.
Data Source
Figure 1
Figure 1
Figure 2~3
AI summary
The invention relates to a retrieval bag (10) with a main bag opening (101) and a flexible bag wall (102) extending from the main bag opening (101) over a bag length, said flexible bag wall forming a bag bottom (103) opposite the main bag opening (101). The invention is characterized by a flexible unrolling pulling means (20) which is accessible from the outside of the bag and fixed to the bag bottom (103), said flexible unrolling pulling means being longer than a distance between its fixation point on the bag bottom (103) and the main bag opening (101). The invention further relates to a laparoscopic arrangement (14) comprising such a retrieval bag.