Cordless RF Surgical Device Circuit Topology and Control
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Solution Overview
Problem
Current electrosurgical forceps for sealing and cutting tissue face challenges in effectively sealing larger vessels due to difficulties in controlling mechanical parameters like pressure and gap distance between electrodes, leading to inconsistent and unreliable seals, and require large tabletop power supplies and cumbersome signal lines, limiting surgical efficiency and freedom.
Innovation Solution
A cordless, bipolar cauterization and cutting device with a self-powered, hand-held design that miniaturizes power supply and control circuitry, featuring a passively articulating end effector and automatic actuation for reduced steps and physical force required, allowing for precise tissue compression and sealing within an optimal range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electrosurgical forceps are used for sealing larger vessels, then vessel sealing function is provided, but mechanical parameter control (pressure and gap distance) is difficult leading to inconsistent seals
Solution Approach 1:
The instrument automatically maintains optimal pressure and gap distance between jaw members through its mechanical design, eliminating the need for manual adjustment by the surgeon. The system self-regulates these parameters to ensure consistent and reliable vessel sealing without requiring operator skill or attention.
Solution Approach 2:
The instrument is designed to automatically adjust and maintain specific pressure and gap distance parameters within optimal ranges for vessel sealing. The mechanical structure ensures that these critical parameters remain consistent throughout the sealing process, regardless of variations in tissue properties or operator technique.
2Power
If traditional electrosurgical forceps with tabletop power supplies are used, then electrosurgical energy is provided, but surgical freedom is limited due to cumbersome signal lines
Solution Approach 1:
The power supply and control circuitry have been extracted from the traditional tabletop unit and integrated directly into the hand-held instrument. This eliminates the need for cumbersome signal lines and power cables, giving the surgeon complete freedom of movement while maintaining full electrosurgical functionality.
Solution Approach 2:
The power supply, control electronics, and electrosurgical components are nested within the compact hand-held instrument housing. This integration allows all necessary functions to be contained within a single portable unit that the surgeon can manipulate freely without external connections.
3Reliability
If traditional electrosurgical forceps are used, then vessel sealing is attempted, but large numbers of steps and physical force are required
Solution Approach 1:
The instrument combines multiple functions (clamping, sealing, and cutting) into a single integrated device that performs all operations through one continuous motion. The jaw members close in a single action that simultaneously achieves compression and activation of the sealing element, eliminating the need for separate clamping and sealing steps.
Solution Approach 2:
The instrument is pre-configured with the sealing element and activation mechanism in position, so that simply closing the jaw members automatically initiates the sealing process. The system is prepared in advance to require only the closing motion from the surgeon, with all subsequent actions occurring automatically.
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 device enables reliable and efficient tissue sealing and cutting with reduced operator effort, eliminates the need for large power supplies, and enhances surgical precision and freedom by integrating all control and power components within the instrument.
Implementation Method 1
A circuit for generating a radio-frequency signal for a surgical device includes a voltage regulator that supplies direct current (DC) voltage, a first metal-oxide-semiconductor field-effect transistor (MOSFET), a second MOSFET, and a MOSFET driver. The MOSFET driver receives the DC voltage supplied from the voltage regulator and has a local oscillator. The local oscillator switches the first MOSFET and the second MOSFET on and off at a frequency generated by the local oscillator.
Implementation Method 2
The circuit further includes a transformer connected to the first and second MOSFETs, having a center tap and a main voltage applied at the center tap, and providing an alternating current (AC) output.
Data Source
AI summary
A circuit for generating a radio-frequency signal for a surgical device is disclosed. The circuit has a voltage regulator that supplies direct current (DC) voltage, a first MOSFET, a second MOSFET, and a MOSFET driver. The MOSFET driver receives the DC voltage supplied from the voltage regulator and has a local oscillator. The local oscillator switches the first MOSFET and the second MOSFET on and off at a frequency generated by the local oscillator. The circuit further includes a transformer connected to the first and second MOSFETs, having a center tap and a main voltage applied at the center tap, and providing an alternating current (AC) output.