Closure Trigger and Clamp Spring for Controlled Jaw Transition
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Solution Overview
Problem
Existing electrosurgical devices lack a mechanism for efficiently transitioning between open and closed positions of jaws with controlled force application, which is crucial for precise tissue handling and cutting during surgical procedures.
Innovation Solution
A surgical instrument with a handle assembly, shaft assembly, and end effector featuring a closure trigger that rotates between open and closed positions, activating a jaw position sensor and a clamp spring to apply force to tissue between pivotably coupled jaws, providing mechanical advantage and controlled closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a closure trigger mechanism is implemented to control jaw transition, then the ease of operation is improved, but the device complexity increases due to additional components like sensors and springs
Solution Approach 1:
The clamp spring automatically engages and disengages from the closure trigger based on the trigger's rotational position, eliminating the need for complex engagement mechanisms. The spring self-regulates the jaw closure force and transition timing through its mechanical interaction with the trigger.
Solution Approach 2:
The clamp spring is pre-positioned and pre-loaded to provide the necessary closure force before the jaw transition begins. This preliminary preparation ensures smooth and controlled jaw movement without requiring complex real-time force regulation systems.
2Measurement precision
If a jaw position sensor with switch is added to detect closure position, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The sensing function is extracted as a separate, simple switch component that can be independently adjusted and calibrated. This modular approach allows precise position detection without integrating complex sensing electronics into the main jaw mechanism.
Solution Approach 2:
The switch activation point can be adjusted by modifying the rotational position at which the closure trigger activates the switch. This parameter adjustment enables precise control of the jaw closure detection threshold without changing the fundamental sensor design.
3Reliability
If a clamp spring is used to apply force to tissue, then the force application consistency is improved, but the device complexity increases due to spring mechanism
Solution Approach 1:
The clamp spring automatically regulates the force applied to the tissue through its mechanical properties. As the spring compresses during jaw closure, it naturally provides a consistent and controlled force without requiring external feedback or active control systems.
Solution Approach 2:
The spring's curved geometry allows it to store and release mechanical energy in a controlled manner, providing smooth and consistent force application throughout the jaw closure motion. The curved shape enables progressive engagement and force distribution.
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
Enables precise and controlled force application during tissue grasping and cutting, enhancing the efficiency and accuracy of electrosurgical procedures by ensuring consistent closure and minimizing tissue damage.
Implementation Method 1
the clamp spring may be configured to: (i) cause the first and second jaws to transition between the open position and the closed position, and (ii) apply a force to tissue located between the first and second jaws
Implementation Method 2
the closure trigger may be configured to: (i) rotate between a first position and a second position, wherein the first position corresponds to the first and second jaws in an open position and the second position corresponds to the first and second jaws in a closed position
Data Source
AI summary
A surgical instrument including a handle assembly and an end effector, including a first jaw pivotably coupled to a second jaw, is disclosed. The handle assembly may comprise a jaw position sensor comprising a switch, a closure trigger, and a clamp spring actuatable by the closure trigger. The closure trigger may be configured to: rotate between a first position and a second position, wherein the first position corresponds to the first and second jaws in an open position and the second position corresponds to the first and second jaws in a closed position, and activate the switch of the jaw position sensor at a predetermined rotated position. The clamp spring may be configured to: cause the first and second jaws to transition between the open position and the closed position, and apply a force to the first and second jaws.