Self-Clearing Surgical Saw Blade for Bone Resection
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Solution Overview
Problem
Ultrasound surgical saws experience rapid temperature rise due to bone chip accumulation, leading to tissue necrosis and limited usage time, as bone chips get vibrated at ultrasonic frequencies, causing excessive heat generation and potential damage to bone and adjacent tissues.
Innovation Solution
A high-speed surgical saw with a self-clearing design that uses radial energy from the ultrasound horn to eject bone chips, combined with a thin cutting blade for efficient heat dissipation and precise cutting, minimizing kerf width and preventing chip accumulation, which reduces heat buildup and maintains tissue temperature below 75°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a surgical saw blade is used to cut bone tissue, then cutting precision and surgical effectiveness are improved, but temperature rise due to bone chip accumulation causes tissue necrosis and limits usage time
Solution Approach 1:
The invention extracts the harmful bone chips from the cutting zone by creating a self-clearing mechanism. The saw blade design with specific tooth geometry and spacing allows bone chips to be ejected from the kerf automatically during the cutting process, preventing their accumulation and the associated heat generation.
Solution Approach 2:
The saw blade is designed to clear its own chips without requiring external intervention. The self-clearing design incorporates features such as tooth orientation, kerf geometry, and vibration characteristics that automatically eject bone chips during normal operation, enabling the blade to maintain low temperatures and continuous cutting capability.
2Duration of action of moving object
If bone chips accumulate within the saw teeth, then cutting action continues, but ultrasonic vibration of bone chips causes rapid temperature increase and tissue damage
Solution Approach 1:
The invention utilizes periodic vibration at ultrasonic frequencies to create a self-clearing action. The periodic motion of the saw blade teeth generates vibrations that actively eject bone chips from the kerf at regular intervals, preventing accumulation and the associated thermal damage while enabling continuous cutting operation.
Solution Approach 2:
The saw blade operates at ultrasonic frequencies, utilizing mechanical vibration to achieve both cutting and chip ejection functions. The vibration causes bone chips to resonate and be ejected from the cutting zone, preventing their accumulation and the rapid temperature rise that would otherwise occur during continuous cutting.
3Ease of manufacture
If a traditional saw blade design is used, then manufacturing is simple, but chip ejection is inefficient leading to heat buildup
Solution Approach 1:
The invention applies local quality by giving different regions of the saw blade teeth different functions. The tooth geometry, orientation, and spacing are specifically designed to optimize chip ejection from the kerf while maintaining cutting effectiveness. This localized optimization of tooth characteristics enables efficient chip clearance without compromising manufacturing feasibility.
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
The solution effectively reduces thermal necrosis and extends the saw's usage time by efficiently clearing bone chips, allowing for precise and aggressive cutting while minimizing heat generation and surgeon fatigue, promoting faster healing and reducing the need for revision surgeries.
Implementation Method 1
An ultrasound generator is in electrical communication with an ultrasound transducer. An ultrasound horn is mechanically coupled to the ultrasound transducer... The ultrasound horn receives the ultrasound waves from the ultrasound generator and transmits the ultrasound waves to the proximal end of the cutting blade
Implementation Method 2
a thin cutting blade for efficient heat dissipation and precise cutting, minimizing kerf width and preventing chip accumulation, which reduces heat buildup and maintains tissue temperature below 75°C
Data Source
AI summary
This invention discloses methods and devices using an improved surgical saw blade for resecting bone tissue during surgical procedures. The surgical saw blade may be used on oscillating, reciprocating, rotary or vibrational surgical saws. The disclosure describes the use of a cutting blade to resect hone tissue without excessive temperature rise during typical surgical procedures. The cutting blade provides a self-clearing design that includes at least two teeth disposed to prevent accumulation of bone chips within the proximity of the teeth. The design of the cutting blade allows the mechanical motion of the blade and other interactions between the blade and the tissue to remove accumulated bone chips and prevent excessive temperature rise.