Arthroscopic Shaver Magnetic Recognition System
Solution Overview
Problem
Powered surgical instruments, such as arthroscopic shavers, require different driving conditions based on the type of blade used, leading to manual adjustments that are time-consuming, prone to human error, and difficult to standardize, especially when changing blades during surgery, due to the limitations and complexities introduced by the inclusion of magnets for blade recognition.
Innovation Solution
The use of a soft magnetic material on the surgical instrument, which diverts and modifies an external magnetic field to allow the handpiece to identify the instrument's properties, eliminating the need for magnets on the instrument and enabling a smaller design with improved recognition accuracy and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If magnets are included on the shaver blade for recognition, then the handpiece can automatically identify the blade type and control driving conditions, but the shaver blade diameter increases and the handpiece design becomes more complex
Solution Approach 1:
The magnetic recognition system is extracted from the shaver blade and relocated to the handpiece. The shaver blade no longer carries magnets, eliminating the need for increased blade diameter. Instead, the handpiece contains magnetic field sources and sensors that detect the presence and type of blade through its coupling portion, achieving automatic recognition without modifying the blade's compact design.
Solution Approach 2:
The recognition system is inverted by placing the active magnetic components in the handpiece rather than on the blade. The handpiece generates magnetic fields and detects their distortion caused by ferromagnetic material in the blade's coupling portion, reversing the conventional approach where the blade would contain magnets for detection.
2Extent of automation
If magnets are included on the shaver blade, then blade type recognition is enabled, but the manufacturing process becomes more complex and unreliable
Solution Approach 1:
The complex magnetic assembly process is extracted from blade manufacturing and relocated to handpiece manufacturing. The shaver blade only requires simple ferromagnetic material in its coupling portion, which can be manufactured using standard processes. The handpiece contains the magnetic field sources and sensors, which are manufactured and calibrated together as an integrated system, eliminating alignment issues between separately manufactured components.
3Adaptability or versatility
If manual adjustment of power supply is used, then flexibility in controlling different blade types is achieved, but setup time increases and human error occurs
Solution Approach 1:
The system performs self-service by automatically detecting the blade type through magnetic field interaction and configuring the appropriate driving parameters without operator intervention. When a blade is coupled to the handpiece, the magnetic sensors automatically identify the blade type and the control system adjusts the motor parameters accordingly, eliminating manual setup time and potential for human error while maintaining full adaptability to different blade types.
Solution Approach 2:
The system uses feedback from magnetic field sensors to automatically determine blade type and adjust power supply parameters. The sensors detect the presence and magnetic properties of ferromagnetic material in the blade coupling, providing feedback that triggers automatic configuration of driving conditions, replacing manual adjustment with an automated closed-loop system.
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 allows for accurate and efficient recognition of surgical instruments without the drawbacks of magnet-based systems, enabling a more ergonomic handpiece design, wider surgical application range, and potential cost savings by integrating magnets into the handpiece rather than the instruments, thus streamlining surgical procedures.
Implementation Method 1
an indicator means comprising soft magnetic material configured to divert a magnetic field detected in the driving means
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A soft magnetic material (12) is located on a surgical instrument (10) for use with a handpiece (20). The soft magnetic material is configured to divert a magnetic field applied to it by the handpiece. The handpiece comprises a magnetic field source (23) positioned to apply a magnetic field to the surgical instrument and a magnetic field sensor (24) to detect the magnetic field and therefore the presence of the soft magnetic material. The presence of the soft magnetic material indicates a property of the surgical instrument. By detecting the magnetic field, the handpiece can thus determine the property of the surgical instrument.