Endoscopic Forceps Toggle Link Mechanism for Vessel Sealing
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Solution Overview
Problem
Current endoscopic electrosurgical forceps face challenges in consistently sealing larger vessels due to difficulties in controlling closure forces and maintaining optimal pressure and gap distances between electrodes, leading to inconsistent tissue sealing and increased user fatigue.
Innovation Solution
The development of an endoscopic forceps with a mechanically advantageous drive assembly and handle design that provides a consistent closure pressure within the range of 3 kg/cm2 to 16 kg/cm2, featuring a toggle link mechanism and ergonomic handles to reduce user effort and improve precision in sealing larger vessels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard electrosurgical instruments are used to seal larger vessels, then vessel sealing may be achieved, but the seal may be inconsistent or ineffective due to difficulty in controlling closure forces and maintaining optimal pressure and gap distance
Solution Approach 1:
The forceps incorporates a spring mechanism that automatically provides the necessary closure force to maintain optimal pressure on the vessel. The spring is pre-loaded to deliver forces within the 3-16 kg/cm² range, eliminating the need for the user to manually control and maintain precise closure forces during the sealing process.
Solution Approach 2:
The patent specifies optimal parameter ranges for vessel sealing: closure pressure between 3-16 kg/cm² and gap distance between 0.001-0.006 inches. The forceps design incorporates these parameters into its mechanical structure, with the spring calibrated to maintain pressure within the optimal range and the jaw geometry designed to maintain the optimal gap distance during closure.
2Adaptability or versatility
If larger vessels are ligated using traditional methods, then vessel closure may be achieved, but the procedure must be converted to open surgery, abandoning the benefits of endoscopic surgery
Solution Approach 1:
The forceps separates the functions of closure and sealing. The mechanical closure function is handled by the spring-loaded jaw mechanism, while the sealing function is handled by the electrosurgical electrodes. This segmentation allows the instrument to effectively seal larger vessels that would otherwise require open surgery, while keeping the overall device design manageable through functional division.
Solution Approach 2:
The forceps combines multiple functions in a single instrument: mechanical closure of the vessel, electrosurgical sealing of the vessel wall, and precise positioning capability. This multi-functionality allows endoscopic sealing of larger vessels (up to several millimeters in diameter) that previously required conversion to open surgery, while integrating all necessary functions into one cohesive device.
3Reliability
If closure force is increased to seal larger vessels, then sealing effectiveness may improve, but the risk of electrode short circuits and premature tissue movement increases
Solution Approach 1:
The spring mechanism provides dynamic closure force that automatically adapts to the vessel size and tissue characteristics. Rather than applying excessive static force, the spring delivers controlled, progressive closure force within the optimal 3-16 kg/cm² range, maintaining consistent pressure throughout the sealing process without causing tissue movement or electrode short circuits.
4Ease of operation
If manual control of closure force is used, then user effort may be reduced, but consistency of closure pressure and gap distance becomes difficult to maintain
Solution Approach 1:
The spring mechanism serves itself by automatically maintaining the required closure pressure within the optimal 3-16 kg/cm² range. The user simply needs to activate the closing action, and the spring takes over to maintain consistent pressure throughout the sealing process, eliminating the need for continuous manual adjustment while ensuring precision.
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 solution enables consistent and effective tissue sealing by maintaining optimal closure pressures and reducing user fatigue, allowing for reliable sealing of larger vessels while minimizing the risk of electrode short circuits and premature tissue movement.
Implementation Method 1
Electrosurgical forceps utilize both mechanical clamping action and electrical energy to affect hemostasis by heating tissue and blood vessels to coagulate, cauterize and/or seal tissue
Implementation Method 2
For the purposes herein, 'coagulation' is defined as a process of desiccating tissue wherein the tissue cells are ruptured and dried
Data Source
AI summary
An endoscopic forceps includes a housing having a shaft attached thereto, the shaft including a pair of jaw members disposed at a distal end thereof. The forceps also includes a drive assembly disposed in the housing which moves the jaw members relative to one another from a first position wherein the jaw members are disposed in spaced relation relative to one another to a second position wherein the jaw members are closer to one another for manipulating tissue. A pair of handles is operatively connected to the drive assembly and the handles are movable relative to the housing to actuate the drive assembly to move the jaw members. Each of the jaw members is adapted to connect to a source of electrical energy such that the jaw members are capable of conducting energy for treating tissue. The forceps also includes a first switch disposed on the housing which is activatable to selectively deliver energy of a first electrical potential to at least one jaw member for treating tissue in a monopolar fashion. A second switch is disposed on the housing and is activatable to selectively deliver energy of a first electrical potential to one jaw member and selectively deliver energy of a second electrical potential to the other jaw member for treating tissue in a bipolar fashion.