Specimen Retrieval Bag Tabs for Smaller Trocar Cannulas
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Solution Overview
Problem
Existing specimen retrieval bags require larger inner diameter trocar cannulas, limiting the minimally invasive nature of endoscopic surgery.
Innovation Solution
A specimen retrieval bag and insertion rod are designed separately, with an introducing tab and bag extending tab to facilitate insertion through a smaller diameter trocar cannula, and a closure drawstring for easy specimen placement and retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a specimen retrieval bag with an operating rod is used, then the bag can be controlled and operated, but the working diameter is limited by the outer diameter of the operating rod requiring a larger trocar cannula
Solution Approach 1:
The specimen retrieval bag is divided into separate functional components: the bag body for containment, the introducing tab for insertion control, and the bag extending tab for deployment. This segmentation eliminates the need for a large-diameter operating rod while maintaining controllability during insertion and retrieval operations.
Solution Approach 2:
The operating rod is completely removed from the specimen retrieval bag design. Instead of using a rod to control the bag, the patent uses a minimal-profile insertion rod that passes through the bag, allowing the bag to be controlled and deployed without the space requirements of a traditional operating rod.
2Device complexity
If a specimen retrieval bag without an operating rod is used, then the bag structure is simpler, but an insertion cannula with larger inner diameter is required to store and insert the bag
Solution Approach 1:
The specimen retrieval bag is designed to be inserted into and stored within a compact insertion cannula. The bag's folded configuration allows it to nest within the cannula's limited space, enabling delivery through a smaller trocar cannula while maintaining bag integrity and functionality.
Solution Approach 2:
The bag transitions from a three-dimensional expanded state to a two-dimensional folded configuration during insertion. This dimensional transformation allows the bag to pass through the narrow insertion cannula in a compressed state and then expand to its full functional size once deployed in the body cavity.
3Object-affected harmful factors
If the trocar cannula inner diameter is reduced for minimally invasive surgery, then patient trauma is reduced, but the specimen retrieval bag cannot be inserted or controlled
Solution Approach 1:
The specimen retrieval bag is constructed from flexible, thin-walled material that can be folded and compressed to a minimal profile for insertion through small cannulas. Once deployed, the material's flexibility allows the bag to expand and conform to the body cavity while maintaining structural integrity for specimen containment and retrieval.
Data Source
AI summary
Disclosed is a specimen retrieval bag, which includes an introducing tab arranged at an opening end of the bag body; and a bag extending tab arranged on a closed end of the bag body; the introducing tab and the bag extending tab are configured to cooperate with an insertion rod, and the insertion rod is configured to pass through the bag extending tab to insert a top end of the insertion rod into the introducing tab. The beneficial effects of the present application are as follows: the diameter of the insertion rod may be effectively reduced, through using the specimen retrieval bag together with the insertion rod matching with the specimen retrieval bag, and a trocar cannula used in conjunction with the insertion rod is also reduced, thereby achieving an effect of minimally invasive in the true sense.