Impedance Matching Circuit for Surgical Instruments
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Solution Overview
Problem
Existing power transfer systems for thermal surgical instruments face challenges in achieving maximum power transfer due to variable impedances caused by manufacturing tolerances, requiring customized impedance matching that is both cost-effective and efficient.
Innovation Solution
The use of a variable capacitor conductive layer in the circuit board, adjustable inductors, and electronically controlled capacitors to monitor and adjust the standing wave ratio, allowing for individual configuration of surgical tips to match impedances and achieve maximum power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If impedance matching is performed using fixed component values, then the circuit design is simple and cost-effective, but maximum power transfer cannot be achieved due to manufacturing tolerances causing impedance variations
Solution Approach 1:
The patent applies dynamics by making the impedance matching circuit adjustable through variable capacitors and inductors. The matching network transitions from fixed to dynamic configuration, allowing real-time or post-manufacturing adjustment of component values to achieve optimal impedance matching for each individual device, thereby maximizing power transfer while accommodating manufacturing tolerances
Solution Approach 2:
The patent implements parameter changes by varying the capacitance and inductance values in the matching network. By adjusting these electrical parameters, the circuit can be customized to match the specific impedance characteristics of each device, enabling maximum power transfer without requiring complete circuit redesign for each unit
2Loss of energy
If customized impedance matching is performed for each device, then maximum power transfer is achieved, but the manufacturing cost and complexity increase
Solution Approach 1:
The patent applies preliminary action by performing impedance matching adjustments after manufacturing but before final assembly or deployment. The variable components allow for post-manufacturing tuning, which eliminates the need for expensive precision manufacturing processes while still achieving optimal performance for each device
Solution Approach 2:
The patent implements self-service through automated impedance measurement and adjustment systems. The device can self-test its impedance characteristics and automatically adjust the matching network parameters, reducing manual intervention and lowering manufacturing costs while achieving customized impedance matching
3Manufacturing precision
If the conductive layer is removed to adjust capacitance, then the impedance matching precision is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the conductive layer into separate, independently adjustable segments. This allows selective removal or modification of specific conductive portions to achieve precise capacitance values, enabling fine-tuned impedance matching while maintaining a systematic and controllable manufacturing process
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 solution enables efficient power transfer by minimizing the standing wave ratio, ensuring maximum power delivery to thermal surgical instruments despite variations in impedance, thereby improving the effectiveness of the surgical tools.
Implementation Method 1
a conductive layer may be used as a variable capacitor. The conductive layer may be formed as part of a circuit board, flex board, etc.
Implementation Method 2
As the system monitors standing wave ratio, portions of the circuit board may be removed until a minimum of the standing wave ratio is obtained.
Data Source
AI summary
An impedance matching circuit may be used to adjust for manufacturing and design tolerances in a surgical instrument. The matching circuit may match the load of a thermal element with the impedance of a power source used to deliver electrical energy to the surgical instrument. The matching circuit may include capacitors, inductors, coaxial cables, varactors, transformers, resistors, and/or combinations thereof. The matching circuit may also comprise a circuit board or flex board layers which may be modified to adjust the impedance of the load.