Ultrasonic Surgical Jaw Structure for Stable Force Distribution
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Solution Overview
Problem
Existing ultrasonic surgical instruments face issues with inconsistent cutting and hemostasis force distribution along the blade, leading to incomplete tissue cutting or coagulation, particularly when dealing with thicker tissues.
Innovation Solution
The ultrasonic surgical instrument incorporates a first abutting portion between the inner and outer tubes to maintain a consistent radial clearance, ensuring a gradual decrease in force from the proximal to distal end, enhancing the consistency of cutting and hemostasis by reducing radial clearance changes between the inner and outer tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the radial clearance between inner tube and outer tube is not controlled, then the structure is simpler, but the cutting and hemostasis force distribution becomes inconsistent along the blade
Solution Approach 1:
A first abutting portion is introduced as an intermediary component between the inner tube and outer tube. This abutting portion maintains a consistent radial clearance between the two tubes, ensuring uniform force distribution along the blade while preventing excessive complexity in the overall structure.
Solution Approach 2:
The radial clearance parameter between the inner tube and outer tube is controlled and maintained at a consistent value along the length of the tubes. This parameter control ensures that the cutting and hemostasis force is distributed evenly from proximal to distal end, resolving the inconsistency problem.
2Reliability
If the radial clearance changes along the length of the tubes, then the structure is more flexible, but the cutting and hemostasis effectiveness decreases for thicker tissues
Solution Approach 1:
The first abutting portion serves as a mediator that maintains constant radial clearance between inner and outer tubes. This ensures reliable and consistent cutting and hemostasis effectiveness throughout the blade length, particularly for thicker tissues, without requiring complex clearance control mechanisms.
3Productivity
If the force decreases gradually from proximal to distal end, then the cutting is more effective, but the radial clearance must be precisely controlled
Solution Approach 1:
The first abutting portion is an intermediary structure that precisely controls and maintains the radial clearance between inner and outer tubes. This precise clearance control enables the force to decrease gradually and consistently from proximal to distal end, maximizing cutting effectiveness.
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 design achieves a more consistent cutting and hemostasis force distribution, improving the effectiveness of tissue cutting and coagulation from the proximal to distal end, especially when handling thicker tissues.
Implementation Method 1
The blade transmits ultrasonic energy to the patient's tissue, the heat generated by friction causes water contained in tissue cells which are in contact with the blade to vaporize
Implementation Method 2
the heat generated by friction causes water contained in tissue cells which are in contact with the blade to vaporize
Implementation Method 3
a first abutting portion provided between the distal portions of the inner tube and the outer tube, configured to provide a support and maintain a radial clearance therebetween
Data Source
AI summary
An ultrasonic surgical instrument includes a waveguide for transmitting ultrasonic energy, the distal end of the waveguide connected to a blade; a jaw member pivotable with respect to the blade; an inner tube sleeved on the waveguide; and an outer tube sleeved on the inner tube. The jaw member is pivotally connected to the distal end of the outer tube, the distal end of the inner tube acting on the jaw member, and the inner tube sliding with respect to the outer tube and driving the jaw member to pivot with respect to the blade. A first abutting portion provided on the distal ends of the inner tube and the outer tube forms a support between the inner and outer tube, so as to avoid a radial clearance change between the inner tube and the outer tubes without affecting the relative sliding movement of the inner and outer tubes.