Surgical Adapter Assembly Switch Mechanism for Loading Unit Status
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Solution Overview
Problem
Conventional linear clamping, cutting, and stapling surgical devices lack effective communication of loading unit engagement status and parameters to the handle assembly, limiting the functionality and safety of surgical procedures.
Innovation Solution
An adapter assembly with a switch assembly that includes a substrate, switch, and wires to communicate the engagement status of a loading unit to the handle assembly, utilizing a resilient member to actuate the switch upon loading unit attachment, enabling the transmission of parameters such as serial number, type, and usage status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a loading unit is selectively coupled to the handle assembly via an adapter assembly, then the disposable loading unit can be attached and disconnected for disposal or sterilization, but there is ineffective communication of engagement status and parameters to the handle assembly
Solution Approach 1:
The adapter assembly incorporates a switch assembly that provides feedback to the handle assembly about the loading unit's engagement status. When the loading unit is properly attached, a cam mechanism actuates a switch that closes an electrical circuit, sending a signal to the handle assembly's circuit board to indicate that the loading unit is engaged and the device is ready for operation.
Solution Approach 2:
The patent replaces purely mechanical engagement detection with an electromechanical system. Instead of relying only on mechanical interlocks, the invention uses a switch assembly with electrical contacts that convert mechanical engagement into an electrical signal, enabling electronic communication of engagement status and parameters to the handle assembly.
2Loss of information
If the switch assembly includes a substrate with switch and wires, then engagement status can be communicated to the handle assembly, but the device complexity increases
Solution Approach 1:
The adapter assembly's switch assembly is designed to handle multiple functions through a unified structure. The same cam mechanism serves both to secure the loading unit mechanically and to actuate the electrical switch simultaneously. The substrate integrates multiple electrical contacts and wiring paths into a single component, reducing overall complexity despite adding electronic functionality.
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
Ensures proper engagement and operation of the surgical device by reliably communicating the loading unit's status to the handle assembly, enhancing procedural safety and efficiency.
Implementation Method 1
The switch actuator is movably disposed within the housing and configured to actuate the switch upon engagement of the surgical loading unit with the elongated body
Data Source
Figure 1A~1C
Figure 2~3
Figure 4~7
AI summary
A surgical instrument includes a handle assembly, a surgical loading unit, and an adapter assembly coupled therebetween. The adapter assembly includes a housing, an elongated body, a switch assembly, and a switch actuator. The elongated body extends distally from the housing and is configured to be coupled to the surgical loading unit. The switch assembly is disposed within the housing and configured to communicate that the surgical loading unit is coupled to the elongated body. The switch assembly includes a substrate, a switch mounted on the substrate, and at least one wire coupled to the substrate. The switch actuator is movably disposed within the housing and configured to actuate the switch upon engagement of the surgical loading unit with the elongated body.