Surgical Shaft Reload Detection via Capacitive and Magnetic Sensing
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Solution Overview
Problem
Current surgical devices lack a reliable mechanism to ensure complete and proper connection between components, leading to potential safety concerns and operational failures during procedures due to incomplete or improperly connected parts.
Innovation Solution
The surgical system incorporates a mechanism with capacitors and magnets, along with spring assemblies and flange features, to verify and ensure proper coupling of adapters, loading units, and staple cartridges, providing feedback to users through displays, haptics, or audibles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mechanical connection mechanisms are used without detection systems, then the device complexity is reduced, but the reliability of component connection cannot be ensured
Solution Approach 1:
The patent replaces complex mechanical detection systems with electromagnetic field-based sensing. Capacitive sensors detect the presence and position of loading units through electrical field changes, while magnetic sensors detect magnet positions to verify proper connection. This substitution of mechanical detection with electromagnetic sensing achieves reliable connection verification while minimizing mechanical complexity.
Solution Approach 2:
The patent introduces capacitive sensors and magnetic sensors as intermediary detection elements between the shaft assembly and loading unit. These sensors act as mediators that detect connection status without requiring direct mechanical contact or complex mechanical interlocks, thereby ensuring reliable detection while simplifying the overall connection mechanism.
2Reliability
If capacitive and magnetic sensing mechanisms are added to detect loading unit connection, then the reliability of connection detection is improved, but the device complexity increases
Solution Approach 1:
The capacitive sensors serve multiple functions: detecting the presence of the loading unit, verifying its proper installation, and determining its position relative to the shaft assembly. The magnetic sensors similarly perform multiple detection functions including verifying magnet position and confirming proper connection orientation. This multi-functionality reduces the need for separate detection systems for each parameter.
Solution Approach 2:
The patent combines capacitive sensing and magnetic sensing into a unified detection system within the shaft assembly. Both sensor types work together to provide comprehensive verification of loading unit connection, merging multiple detection approaches into a single integrated system that achieves high reliability without proportionally increasing complexity.
3Measurement precision
If multiple sensors (capacitive and magnetic) are used to verify complete connection, then the measurement precision of connection status is improved, but the device complexity increases
Solution Approach 1:
The patent uses capacitive sensors positioned at specific locations to detect critical aspects of loading unit connection, and magnetic sensors to detect magnet positions. Rather than using sensors throughout the entire assembly, the sensing elements are strategically placed to detect only the essential connection parameters, achieving sufficient precision without excessive sensing coverage.
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 safe and reliable operation by confirming complete connections between components, preventing operational failures and enhancing user confidence by providing clear feedback on connection status.
Implementation Method 1
a first capacitor (21130) mounted to the distal end (21120) of the shaft assembly (21104)... a second capacitor (21132) mounted to the proximal end (21126) of the loading unit (21114)... monitor a capacitance between the first capacitor (21130) and the second capacitor (21132)
Implementation Method 2
a magnet (21620) coupled to the loading unit (21202)... a sensor assembly (21226) which can be coupled to the distal end (21120) of the shaft assembly (21200)... sense a polarity of the first magnet (21622) and the second magnet (21624)
Data Source
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AI summary
A surgical system is disclosed including a housing assembly including an elongate shaft extending therefrom and a loading unit including a lug extending therefrom. The elongate shaft includes a spring assembly. The loading unit is rotatable relative to the elongate shaft between an unlocked position and a locked position. The spring assembly is configured to resist rotation of the lug as the loading unit is rotated toward the locked position.