Inflatable Endosurgical Extraction Bag for Large Specimen Retrieval
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Solution Overview
Problem
Current endosurgical extraction bags are inadequate for handling large or irregularly shaped specimens during minimally invasive surgeries, leading to increased operative time, risk of specimen spillage, and complications such as parasitic tissue growth or cancer staging issues due to their rigidity, non-compliance, and difficulty in accommodating various specimen sizes and shapes.
Innovation Solution
A distensible endosurgical extraction bag that can be inflated and expanded within the abdominal cavity using existing insufflation tubing, allowing for secure containment of specimens through a circumferential and vertical air channel system, which can be easily maneuvered and closed to facilitate safe retrieval without the need for morcellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional rigid extraction bags are used, then structural stability is maintained, but the ability to accommodate large and irregular specimens is compromised
Solution Approach 1:
The extraction bag transitions from a rigid static structure to a dynamic inflatable structure. The bag includes an inflatable chamber that can be inflated with gas or fluid to expand and conform to the shape of large or irregular specimens, providing both adaptability and structural support when needed.
Solution Approach 2:
The physical state of the extraction bag is changed by introducing gas or fluid pressure. By controlling the inflation pressure, the bag can adapt its volume and shape parameters to match the specimen being extracted, while maintaining sufficient structural integrity through controlled pressurization.
2Volume of stationary object
If extraction bags are made larger to accommodate massive specimens, then specimen containment capacity increases, but device complexity and difficulty of manipulation increase
Solution Approach 1:
The extraction bag is divided into multiple functional segments: an inflatable chamber for specimen containment, a deflatable portion for easy removal, and a closure mechanism. This segmentation allows the large-volume bag to be manipulated by controlling inflation/deflation of specific sections rather than moving the entire structure.
Solution Approach 2:
The bag utilizes dynamic inflation and deflation capabilities to change its effective size and shape during different phases of the extraction process. When inflated, it provides large capacity; when deflated, it becomes easier to manipulate and remove from the patient's body.
3Productivity
If conventional extraction bags are used, then standardization is maintained, but operative time increases due to difficulty in bagging specimens
Solution Approach 1:
The extraction bag is pre-positioned within the abdominal cavity before the specimen is fully resected. The inflatable chamber is already in place and can be immediately inflated to contain the specimen as it is being removed, eliminating the time-consuming step of attempting to place a rigid bag around an already-resected specimen.
Solution Approach 2:
The dynamic inflation capability allows the bag to expand and accommodate the specimen in real-time during the extraction process, rather than requiring the specimen to be manually manipulated into a fixed rigid bag. This significantly simplifies the bagging operation and reduces operative time.
4Adaptability or versatility
If rigid extraction bags are used, then manufacturing simplicity is maintained, but compliance with intra-abdominal pressure and distensibility are compromised
Solution Approach 1:
The extraction bag utilizes flexible inflatable chambers made from compliant materials that can distend to accommodate various specimen shapes and sizes. These flexible membranes provide the necessary compliance while maintaining structural integrity through controlled inflation pressure.
Solution Approach 2:
The bag incorporates pneumatic or hydraulic inflation systems using gas or fluid pressure to create a distensible containment structure. This approach provides compliance and adaptability that rigid structures cannot achieve, while the inflation mechanism itself is relatively simple to manufacture.
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
The bag minimizes operative time, reduces intra-abdominal pressure, and enhances safety by allowing for the secure retrieval of large and irregular specimens, reducing the risk of spillage and complications, while being operator-friendly and cost-effective.
Implementation Method 1
Due to a novel and unique ability to be inflated and be distended, a bag allows and accommodates for small, medium size and massive specimens
Data Source
AI summary
Provided is an intra-abdominal tissue retrieval bag. The bag has an inflated state and a deflated state. The bag is introduced into the abdomen in a deflated state through a small incision and placed underneath the specimen to be retrieved. The bag is defined by an inflatable defining circumferential ring at the opening and an inflatable collection sac. Both inflated using external pneumo source sequentially, the same that is used to maintain pneumoperitoneum during laparoscopic surgery. After insufflation, the specimen becomes fully contained and ready for retrieval after desufflation.