Orthopedic Power Tool Magnetic Sensor Speed Control
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Solution Overview
Problem
Current power tools for orthopedic surgery have fixed maximum rotational speed and torque values, leading to risks such as bone necrosis and screw damage due to excessive speed and torque during various surgical operations.
Innovation Solution
A power tool with a magnetic sensor system that identifies attached accessories and controls the motor to operate within preset maximum rotational speed and torque values by sensing the magnetic field strength or number of magnets on the attachments, ensuring appropriate speed and torque for each surgical function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power tool uses a fixed maximum rotational speed and torque value, then the device structure is simple, but it causes bone necrosis and screw damage due to excessive speed and torque during various surgical operations
Solution Approach 1:
The patent replaces mechanical speed and torque control mechanisms with a magnetic sensing system. The magnetic sensor detects the attachment type and automatically adjusts motor parameters, eliminating the need for complex mechanical gear systems and manual control mechanisms, thus improving safety without excessive complexity
Solution Approach 2:
The patent implements a feedback control system where the magnetic sensor continuously detects the attachment type and feeds this information back to the controller, which then adjusts the motor's rotational speed and torque accordingly. This closed-loop control ensures safe operating parameters for each specific surgical attachment
2Adaptability or versatility
If the attachment uses a fixed gear ratio, then the manufacturing is simple, but it cannot provide appropriate speed and torque for each surgical function
Solution Approach 1:
The patent changes the operating parameters (rotational speed and torque) of the motor based on the detected attachment type. Instead of manufacturing different gear ratios for each attachment, the system maintains a fixed mechanical structure and dynamically adjusts electrical parameters through magnetic sensing and controller intervention
Solution Approach 2:
The patent creates a universal attachment system where a single attachment design with magnetic identifiers can be used across different surgical functions. The controller adapts the motor output to suit each attachment's requirements, eliminating the need for multiple specialized attachments with different gear ratios
3Productivity
If the rotational speed is high for drilling operations, then the productivity is improved, but it causes bone necrosis due to high heat generation
Solution Approach 1:
The patent implements dynamic speed control where the motor rotational speed is not fixed but is continuously adjusted based on the detected attachment type and surgical operation requirements. This allows optimal drilling speed that maintains productivity while preventing excessive heat generation that could cause bone necrosis
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 precise control of the power tool's speed and torque, reducing the risk of complications during orthopedic surgery by matching the tool's output to the specific requirements of each attachment, thereby improving surgical safety and efficiency.
Implementation Method 1
a first magnetic sensor portion including a first magnetic sensor capable of sensing a magnetic field strength or number of the one or more first magnets
Data Source
AI summary
A power tool for orthopedic surgery is provided, which can be coupled with an attachment having one or more first magnets mounted thereon, and include a power tool body including a power tool case, an attachment fastening portion connected to one end of the power tool body, a motor power transmitting portion protruding toward the attachment fastening portion and transmitting power to the attachment, a motor that drives the motor power transmitting portion, a first magnetic sensor portion including a first magnetic sensor capable of sensing a magnetic field strength or number of the one or more first magnets, a control portion that controls the motor to operate below a preset maximum rotational speed and maximum torque value according to the magnetic field strength or the number sensed by the first magnetic sensor, and a power supply that supplies power to the motor and the control portion.