Ultrasonic Bone Cutting Device with Integrated Cooling
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Solution Overview
Problem
Traditional surgical saws generate excessive heat and produce uneven cuts, leading to tissue damage and impaired healing, while existing ultrasonic devices are inadequate for cutting large bone sections due to heat generation and inefficiency in cooling the blade at the bone interface.
Innovation Solution
A cutting device with a static casing and ultrasonic horn that incorporates internal channels for cooling fluid to reduce heat generation and features tapered portions to distribute load and prevent binding, allowing for efficient cutting of large bone sections with reduced heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional oscillating or reciprocating bone saws are used to cut bone, then cutting capability is achieved, but excessive heat is generated at the blade and bone interface causing tissue necrosis
Solution Approach 1:
The patent replaces traditional oscillating or reciprocating mechanical cutting systems with an ultrasonic cutting system. The ultrasonic blade vibrates at high frequency (20-100 kHz) with small amplitude, creating a different cutting mechanism that generates significantly less heat at the bone interface while maintaining effective cutting capability.
Solution Approach 2:
The patent changes the cutting parameters by using ultrasonic frequency vibration instead of traditional mechanical oscillation. This parameter change fundamentally alters the heat generation characteristics, reducing blade temperature while preserving cutting efficiency through the unique ultrasonic cutting mechanism.
2Temperature
If irrigation systems are added to cool the blade, then heat management is improved, but the irrigation channels are compacted by surgical debris rendering them unusable
Solution Approach 1:
The patent extracts the irrigation function from traditional channel-based systems and implements it through a balloon catheter that can be directly positioned at the bone interface. This extraction allows irrigation to occur without vulnerable channels that can be compacted by debris.
Solution Approach 2:
The patent introduces a balloon catheter as an intermediary device between the irrigation source and the bone interface. The balloon serves as a flexible, debris-resistant medium that can be inflated to deliver cooling fluid directly to the cutting site without requiring fixed channels that are susceptible to compaction.
3Manufacturing precision
If traditional bone saws with multiple teeth are used, then cutting capability is maintained, but uneven cuts are produced preventing ideal realignment
Solution Approach 1:
The patent replaces the multi-tooth mechanical saw system with a single-edge ultrasonic blade. The ultrasonic vibration mechanism allows the blade to cut through bone with a single continuous edge, producing remarkably smooth cuts without the tooth-induced irregularities while maintaining efficient cutting speed.
4Object-affected harmful factors
If oscillating or reciprocating saws with serrated edges are used, then cutting function is achieved, but neighboring soft tissues are torn causing blood loss and nerve damage
Solution Approach 1:
The patent replaces the serrated edge mechanical cutting system with an ultrasonic single-edge blade. The high-frequency vibration creates a cutting action that cleanly severs bone without the tearing motion of serrated teeth, significantly reducing soft tissue damage while preserving cutting effectiveness.
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 device effectively minimizes heat damage to tissues, produces smoother cuts, and maintains a safe temperature for bone healing by integrating cooling fluid channels and tapered rails to manage load and prevent friction-induced heat.
Implementation Method 1
A cutting device with a static casing and ultrasonic horn that incorporates internal channels for cooling fluid to reduce heat generation
Implementation Method 2
incorporates internal channels for cooling fluid to reduce heat generation and features tapered portions to distribute load and prevent binding
Data Source
AI summary
Medical devices and related methods for transforming bone, other tissue, or other material are disclosed herein. According to an aspect, a cutting device includes a static casing that defines a sheathing slot and an opening. The sheathing slot extends to the opening and has a first height at an end of the opening. Further, the bone cutting device includes a horn including a first end and a second end. The first end is configured to operatively connect to a source of movement. Further, the second end includes a cutting component having a second height. The first height is greater than the second height.