Surgical Drill Impedance Monitoring for Depth Control
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Solution Overview
Problem
Conventional methods for drilling holes in bones are inefficient and prone to tissue injury due to the need for repeated interruptions and unreliable depth measurement, especially in complex 3D regions like the pelvis, where surgeons must manually verify drill penetration through soft tissue and cortical bone.
Innovation Solution
A surgical drilling device equipped with a bore electrode and a resistance measuring device that uses alternating current to measure impedance between the drill tip and a backing electrode, allowing continuous monitoring of tissue type and drill depth without interrupting the drilling process, and providing optical and acoustical signals for precise navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mechanical slide gauge is used for measuring hole depth, then measurement can be performed, but the process is time consuming and requires repeated interruptions
Solution Approach 1:
The patent replaces the mechanical slide gauge system with an electrical impedance measurement system. The drilling device incorporates electrodes that measure electrical impedance through the bone tissue, providing continuous depth information without mechanical contact or interruptions to the drilling process.
Solution Approach 2:
The impedance measurement system operates continuously during drilling, allowing the surgeon to monitor hole depth in real-time without interrupting the drilling action. This eliminates the need to stop drilling for repeated measurements with mechanical gauges.
2Object-affected harmful factors
If repeated interruptions are made to verify cortex penetration, then tissue injury can be prevented, but productivity decreases
Solution Approach 1:
The system provides continuous electrical impedance feedback during drilling. Since impedance values differ between cortical bone, spongy bone, and soft tissue, the surgeon receives real-time information about drill tip location and tissue type, enabling continuous monitoring without interruptions to prevent soft tissue injury.
Solution Approach 2:
The patent replaces manual palpation and repeated drilling interruptions with continuous electrical impedance measurement, allowing the surgeon to monitor drilling progress and tissue type in real-time without stopping the drilling process.
3Measurement precision
If X-ray control is used repeatedly to verify drilling depth, then accurate depth information can be obtained, but operating time increases and radiation exposure occurs
Solution Approach 1:
The patent replaces X-ray imaging with electrical impedance measurement for depth verification. The impedance-based system provides continuous real-time feedback without radiation exposure, eliminating the need for repeated X-ray controls while maintaining accurate depth information.
4Measurement precision
If mechanical slide gauge is used for length measurement, then screw length can be determined, but the process is erratic and may require corrections
Solution Approach 1:
The patent replaces the mechanical slide gauge with an electrical impedance measurement system that provides continuous, real-time depth information. This eliminates the erratic nature of mechanical measurements and provides more reliable screw length determination throughout the drilling process.
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
Enables precise and continuous measurement of drill depth and tissue type, reducing the risk of soft tissue injury and eliminating the need for repeated X-ray controls, thereby saving operating time and improving surgical precision in complex bone structures.
Implementation Method 1
the electrical resistance between the bore electrode and the backing electrode can be measured and indicated on a monitoring screen
Implementation Method 2
the resistance measuring device (RMD) produces an alternating current and registers resistance by the dimension of impedance
Data Source
AI summary
A medical drilling device for drilling of human or animal tissue carries a drill (7) that is electrically contacted by a bore electrode (9) and a backing electrode (10). Both electrodes (9, 10) are charged by a resistance-measuring device (11) in a way, that electrical resistance of tissue (2, 3, 4), preferably impedance, as measured between the drill (7) and the backing electrode (10) becomes measurable. By means of a monitoring device (13), the surgeon is provides with information about the type of the respective tissue and the depth of drilling.