Surgical Saw Temperature Sensing for Bone Cutting Heat Control

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Solution Overview

Problem

Traditional surgical saws generate excessive heat at the blade and bone interface, leading to necrosis of osteocytes and uneven cuts, while existing irrigation systems are ineffective in cooling the blade effectively, and ultrasonic blades are unsuitable for cutting large bone cross-sections.

Innovation Solution

Incorporation of a static casing with in-situ temperature sensors to measure real-time temperatures at the blade and bone interface, allowing for precise control and activation of cooling mechanisms to prevent thermal necrosis and ensure smooth cuts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional surgical saws use rapid motion of the blade to cut bone, then cutting speed is improved, but excessive heat is generated at the blade and bone interface leading to thermal necrosis

Engineering Contradiction:

Improvecutting speedVSAvoidthermal necrosis

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by implementing cooling mechanisms (irrigation channels, coolant delivery systems) that are activated before and during the cutting process to prevent heat accumulation. The cooling system is pre-positioned to deliver coolant to the blade-bone interface before excessive heat can cause thermal necrosis, thereby maintaining high cutting speeds while preventing thermal damage.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses coolant fluid as an intermediary substance between the blade and bone interface. The coolant absorbs heat generated during cutting and transfers it away from the surgical site, mediating the thermal interaction between the high-speed blade and bone tissue to prevent thermal necrosis while maintaining cutting efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Loss of substance

If irrigation systems are used to flush the surgical site, then debris removal is improved, but the blade cooling effectiveness is insufficient

Engineering Contradiction:

Improvedebris removalVSAvoidblade temperature

Core Design Contradiction:

Loss of substanceVSTemperature

Solution Approach 1:

The patent employs hydraulic principles by designing integrated irrigation channels within the blade structure that utilize fluid pressure and flow dynamics. The channels are positioned to deliver coolant directly to high-heat-generation zones at the blade-bone interface, using hydraulic pressure to ensure adequate coolant delivery even in the presence of surgical debris, thereby achieving both debris removal and effective blade cooling.

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Use of energy by stationary object

If channels are provided between parallel portions of the saw blade for irrigation, then coolant flow is improved, but the blade edge becomes discontinuous reducing cutting efficiency

Engineering Contradiction:

Improvecoolant flowVSAvoidcutting efficiency

Core Design Contradiction:

Use of energy by stationary objectVSProductivity

Solution Approach 1:

The patent applies local quality by positioning irrigation channels and coolant outlets at specific locations along the blade where heat generation is most intense, rather than uniformly distributing them. The channels are strategically placed in regions with high friction and heat accumulation, allowing effective cooling at critical zones while maintaining blade edge continuity and cutting efficiency in other areas.

Inventive Principle:

Principle #3Local quality

4Productivity

If oscillating saws use sharpened teeth along cutting edges, then cutting capability is improved, but neighboring soft tissues are torn leading to blood loss and nerve damage

Engineering Contradiction:

Improvecutting capabilityVSAvoidsoft tissue damage

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent applies parameter changes by modifying the blade geometry from traditional serrated teeth to alternative configurations such as continuous edges with varying profiles, oscillation amplitudes, and frequencies. These parameter changes allow the blade to cut bone effectively while reducing the mechanical trauma to adjacent soft tissues, minimizing tearing, blood loss, and nerve damage.

Inventive Principle:

Principle #35Parameter changes

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

Prevents thermal necrosis of bone tissues by maintaining optimal cutting temperatures and ensuring precise, even cuts, reducing the risk of soft tissue damage and promoting efficient bone healing.

Implementation Method 1

Incorporation of a static casing with in-situ temperature sensors to measure real-time temperatures at the blade and bone interface

Methodology Applied

Scientific EffectTemperature sensing: Thermocouple

Data Source

PatentUS12594081B2Medical cutting devices with static components having temperature sensors and related methods

Publication Date: 2026.04.07 INNOVATIONS 4 SURGERY LLC

AI summary

Medical cutting devices with static components having temperature sensors and related methods are disclosed. According to an aspect, a cutting device includes a blade working body being configured for operable connection to a source of movement. The cutting device also includes a static component being configured for operable connection to the source of movement. Further, the cutting device includes one or more temperature sensors attached to the static components and configure to detect a temperature level of a work space near the blade working body.