Blade Assembly with Troughs for Bipolar Vessel Sealing
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Solution Overview
Problem
Existing electrosurgical instruments are ineffective for uniformly reproducible pressure on blood vessels or tissues during sealing procedures, often resulting in non-uniform or ineffective seals due to inadequate control over clamping pressure and gap distances between conductive tissue-contacting surfaces.
Innovation Solution
The design of electrosurgical forceps with a blade assembly featuring a blade body in sliding communication with a blade channel, where the blade body includes cutting elements with flanges that extend into troughs, allowing for precise movement and control of the cutting edge into the blade channel, minimizing movement and thermal spread during tissue sealing and transection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If blade members simply cut tissue in a mechanical manner, then cutting function is provided, but vessel sealing effectiveness is poor
Solution Approach 1:
The patent combines the cutting function and vessel sealing function into a single integrated instrument. The jaw members are configured to perform both mechanical cutting and bipolar electrosurgical sealing, allowing the surgeon to complete both tasks with one device rather than switching between separate instruments.
Solution Approach 2:
The jaw members are designed with multi-functionality, serving both as cutting edges and as sealing electrodes. The same jaw surfaces that mechanically cut tissue also function as the contact surfaces for delivering bipolar electrosurgical energy to seal vessels, eliminating the need for separate specialized tools.
2Device complexity
If clamping pressure alone is used to control sealing thickness, then simplicity is maintained, but gap tolerances and parallelism requirements cannot be adequately controlled
Solution Approach 1:
The jaw members are pre-configured with precisely engineered sealing surfaces that establish the correct gap distance and parallelism before the sealing process begins. The mechanical structure inherently maintains the required tolerances through its design, eliminating the need for complex real-time adjustment mechanisms during operation.
Solution Approach 2:
The patent replaces complex mechanical adjustment systems with a simplified design that relies on the inherent precision of the jaw member construction. Rather than using multiple actuators or adjustment mechanisms to control gap distance, the design achieves precision through careful mechanical engineering of the jaw surfaces themselves.
3Force
If too much force is applied during clamping, then tissue compression is improved, but the poles may touch and energy transfer is blocked
Solution Approach 1:
The jaw members are pre-configured with precisely engineered sealing surfaces that establish the correct gap distance and parallelism before the sealing process begins. The mechanical structure inherently maintains the required tolerances through its design, eliminating the need for complex real-time adjustment mechanisms during operation.
Solution Approach 2:
The design incorporates feedback mechanisms that monitor the clamping force and gap distance, automatically adjusting parameters to maintain optimal conditions for both compression and energy transfer. This ensures the poles remain at the correct separation distance to prevent contact while maintaining sufficient compression for effective sealing.
4Reliability
If too low a force is applied during clamping, then pole contact is avoided, but a thicker and less reliable seal is created
Solution Approach 1:
The jaw members are pre-configured with precisely engineered sealing surfaces that establish the correct gap distance and parallelism before the sealing process begins. The mechanical structure inherently maintains the required tolerances through its design, eliminating the need for complex real-time adjustment mechanisms during operation.
Solution Approach 2:
The patent employs controlled changes in clamping force parameters during the sealing process, dynamically adjusting the force to maintain optimal compression without causing pole contact. This parameter control ensures consistent seal thickness and reliability across different tissue types and conditions.
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
This configuration enables consistent, high-quality tissue transection and sealing while reducing thermal spread and collateral damage to adjacent tissue, allowing for accurate division and sealing with controlled pressure and gap distances.
Implementation Method 1
Electrosurgical forceps utilize both mechanical clamping action and electrical energy to effect hemostasis by heating the tissue and blood vessels to coagulate and/or cauterize vessels or tissue
Implementation Method 2
two predominant mechanical parameters must be accurately controlled: 1) the pressure applied to the vessel; and 2) the gap distance between the conductive tissue contacting surfaces (electrodes)
Data Source
AI summary
An electrosurgical forceps for sealing tissue is adapted to include a pair of movable jaw members that cooperate to grasp tissue. At least one of the jaw members has a blade channel defined therein configured for sliding reception of a surgical blade assembly, the blade channel including a plurality of troughs and a blade body having a plurality of cutting elements extending therealong, each of the cutting elements including a cutting edge extendable into the blade channel and a flange extending into each of the troughs. The blade body is selectively movable from a first position wherein the cutting edges of the cutting elements are spaced relative to the blade channel and the flanges are rest within the troughs to at least one second position wherein the cutting edges extend within the blade channel.