Two-Angle Trocar Insertion for Body-Wall Resistance
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Solution Overview
Problem
In single port surgery, the interference between endoscopes and treatment tools through a single opening in the body wall hinders operation and observation, and the instability of illuminators within the body cavity due to lack of reliable fixation leads to inadequate illumination and potential organ damage.
Innovation Solution
A method for inserting medical instruments into a body cavity involves a two-step insertion process with specific angles to securely fix the instrument to the body wall, using a first direction generally vertical to the body surface and a second direction with a sharper angle, allowing for reliable fixation without increasing complexity or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single opening is formed on the body wall for single port surgery, then the number of postoperative scars is reduced, but the endoscope and treatment tools interfere inside and outside the body cavity, constraining operation and observation
Solution Approach 1:
The body wall opening is segmented into multiple smaller openings instead of one large opening. Each opening accommodates specific instruments independently, eliminating interference between tools while maintaining a cosmetically acceptable appearance with multiple small scars rather than one large scar.
2Ease of manufacture
If the insertion portion of the endoscope is reduced in diameter, then the postoperative scar becomes less noticeable, but enough occupation space for the light guide is not secured, causing insufficient brightness
Solution Approach 1:
The light guide is positioned at a specific angle relative to the endoscope insertion portion, utilizing three-dimensional spatial arrangement. The light guide extends at an angle rather than parallel to the endoscope, creating additional occupation space within the insertion portion without increasing its diameter, thereby maintaining both cosmetic outcome and illumination intensity.
3Device complexity
If the illuminator is not reliably fixed to the body wall, then the configuration remains simple, but the illuminator is easily shaken by body motions and vibrations, making illumination unstable and potentially causing organ damage
Solution Approach 1:
The fixation function is extracted from the illuminator itself and implemented through the insertion portion's geometric design. The inclined insertion portion of the illuminator engages with the body wall at an angle that provides inherent mechanical stability, eliminating the need for additional fixation mechanisms on the illuminator while maintaining configuration simplicity and illumination stability.
4Ease of operation
If the front end of the medical instrument is inserted along a direction vertical to the body surface, then the insertion is straightforward, but the instrument is not reliably fixed to the body wall, leading to instability
Solution Approach 1:
The medical instrument is first inserted along a direction substantially vertical to the body surface to penetrate the body wall, then the insertion direction is changed to an inclined direction for final positioning. This preliminary vertical insertion facilitates easy penetration, while the subsequent angular adjustment ensures reliable fixation to the body wall.
Data Source
AI summary
To reliably fix a medical instrument to a body wall by easy operation without causing increased costs and complicated configuration. For inserting a trocar as a medical instrument which can be pierced into a body cavity, a front end of the trocar is inserted into a body wall along a first direction having a specified angle with respect to an exterior surface of the body wall, and then the front end of the trocar is inserted into the body wall along a second direction whose angle with the exterior surface of the body wall is acuter than that of the first direction. As a result, the trocar is reliably fixed with large resistance received from the body wall.