Surgical Handpiece Longevity Circuit for Usage Enforcement
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Solution Overview
Problem
Conventional electrosurgical devices lack effective enforcement of usage limits for handpieces, allowing potential reuse beyond a safe lifespan, which compromises patient safety due to interoperability with multiple generators and lack of monitoring for duration of use.
Innovation Solution
Incorporating a longevity circuit within the handpiece that monitors usage patterns, such as time since first activation, number of activations, or aggregate activation time, to disable the therapy circuit when a predetermined usage limit is reached, ensuring safe operation independent of the connected generator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If handpiece is designed to be interoperable with multiple generators, then adaptability is improved, but usage limit enforcement deteriorates
Solution Approach 1:
The usage limit enforcement function is segmented from the generator and embedded within the handpiece itself. The handpiece contains an internal memory device and control circuitry that independently tracks and enforces usage limits, separating the enforcement mechanism from the power source to ensure consistent operation across different generator models.
Solution Approach 2:
The handpiece performs self-monitoring and self-enforcement of usage limits through its internal memory and control circuits. The device automatically tracks activation counts and durations, and autonomously disables therapy circuit operation when predetermined usage thresholds are reached, without requiring external generator intervention.
2Productivity
If handpiece allows repeated use beyond single-use designation, then productivity is improved, but safety deteriorates
Solution Approach 1:
The handpiece is pre-programmed with predetermined usage limits during manufacturing. These limits, based on safety criteria such as maximum activation counts or cumulative activation durations, are stored in internal memory and automatically enforced before any potential safety violations can occur, preventing reuse beyond safe thresholds.
Solution Approach 2:
The control circuit continuously monitors therapy circuit activation status and provides real-time feedback against the stored usage limits. When the accumulated usage approaches or exceeds the predetermined threshold, the system automatically disables further therapy circuit operation, creating a closed-loop safety mechanism that prevents excessive reuse.
3Reliability
If longevity circuit is implemented in handpiece, then usage limit enforcement is improved, but device complexity increases
Solution Approach 1:
The longevity enforcement functions, including memory storage and control logic, are merged into a single integrated circuit board within the handpiece. This consolidation combines multiple discrete components into one unified unit, reducing overall component count and simplifying assembly while maintaining the necessary usage tracking and enforcement capabilities.
Solution Approach 2:
The integrated circuit board performs multiple functions: storing usage limit parameters in memory, monitoring therapy circuit activation status, comparing current usage against stored limits, and disabling therapy operation when limits are exceeded. This multi-functional design eliminates the need for separate dedicated circuits for each function, reducing overall device complexity.
Data Source
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AI summary
Surgical device employs a longevity circuit for preventing operation after a specified time based on safe use expectations. The surgical device delivers a therapy signal via a handpiece having electrodes in proximity to the surgical site. The therapy signal is a high frequency electrical signal delivered from a generator coupled to the handpiece, and activated by a control signal. Therapy circuit established by coupling the handpiece and generator delivers the therapy signal, and is monitored for activation based on a time since a first activation, a number of activations, or an aggregate time of activated intervals. A usage limit defines the activation lifespan, and is employed for monitoring either the therapy circuit or the control circuit, to determine a usage history. Following expiration of a safe usage limit, a longevity circuit in the handpiece disables the handpiece for successive uses, and is independent of a connection to a particular generator.