Trocar Fixation Assembly with Annular Locking Mechanism
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Solution Overview
Problem
Current trocar fixation methods in minimal invasive surgery, such as balloon and Hasson trocars, face challenges with stabilization, risk of dislocation, and sterility issues, particularly for cannulas with smooth surfaces, which can lead to complications during surgery.
Innovation Solution
A trocar fixation assembly comprising a fixation device with an annular member and a medical dressing, where the fixation device is movable between a first configuration for inserting the trocar and a second configuration for locking it in place, using a spring wire mechanism to secure the trocar, and a medical dressing for maintaining sterility and preventing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a balloon trocar is used to fixate the trocar, then the trocar can be anchored in the abdomen without sutures, but the balloon may rupture causing patient risk and cannot be simply removed
Solution Approach 1:
The invention extracts the fixation function from internal body anchoring (balloon or sutures) and relocates it to an external fixation device that attaches to the skin surface. The annular member with channel provides external retention without requiring internal balloons or sutures, eliminating the risks of balloon rupture and suture removal complexity.
Solution Approach 2:
The fixation device acts as an intermediary between the trocar and the patient's body. Instead of directly anchoring the trocar inside the body with balloons or sutures, the annular fixation device provides a mechanical interface at the skin surface that secures the trocar while allowing easy attachment and removal.
2Reliability
If a Hasson trocar with sutures is used, then the trocar can be securely fixedated, but the system becomes cumbersome requiring sutures and their removal
Solution Approach 1:
The invention removes the suture component entirely from the fixation system. The annular member with its channel provides mechanical retention through its structure alone, eliminating the need for sutures and the associated complexity of threading, tying, and removing sutures.
Solution Approach 2:
The fixation device appears to be a disposable component that provides secure fixation during surgery and can be easily removed afterward. This single-use approach eliminates the need for reusable suture materials and the time-consuming process of suture removal.
3Ease of operation
If a smooth cannula is used, then the insertion is easier, but the cannula is easily dislocated and may project out or deeper into the body cavity
Solution Approach 1:
The annular fixation device serves as an intermediary that provides the retention function separate from the cannula itself. The smooth cannula maintains its ease of insertion properties while the external annular member with channel provides the necessary positional stability and prevents dislocation.
Solution Approach 2:
The invention separates the insertion function (smooth cannula) from the retention function (annular fixation device with channel). This segmentation allows the cannula to remain smooth for easy insertion while the fixation device provides mechanical retention through its structured channel that accommodates and secures the cannula.
4Stability of the object's composition
If threaded or ribbed cannulas are used, then retention is improved preventing movement, but the insertion becomes more difficult and may cause tissue damage
Solution Approach 1:
The invention divides the functions of insertion and retention into separate components. The cannula remains smooth for easy insertion, while the annular fixation device with channel provides the retention mechanism, eliminating the need for threaded or ribbed surfaces on the cannula itself.
Solution Approach 2:
The retention function is extracted from the cannula surface (no threads or ribs needed) and relocated to the annular fixation device. This allows the cannula to maintain its smooth surface for easy insertion while the fixation device provides mechanical retention through its channel structure.
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 trocar fixation assembly provides safe, simplified, and stable fixation of the trocar, preventing dislocation and facilitating easy attachment and detachment, while maintaining sterility and reducing the risk of complications during surgery.
Implementation Method 1
using a spring wire mechanism to secure the trocar
Data Source
AI summary
Described is a trocar fixation assembly that includes a fixation device and a medical dressing. Also described is a trocar system that includes the trocar fixation assembly.