Differential Dissecting Instrument for Soft Tissue
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Solution Overview
Problem
Current blunt dissection methods in surgery are challenging due to the difficulty in differentiating between soft and firm tissues, leading to increased risk of accidental damage to critical structures like blood vessels and nerves, especially during minimally invasive procedures.
Innovation Solution
A differential dissecting instrument with a drive mechanism and tissue-engaging surface designed to selectively disrupt soft tissues while avoiding firm tissues, utilizing a rotary drive train and motion filter to convert rotational motion into planar oscillation, allowing for precise dissection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sharp dissection is used to easily cut through tissues, then cutting efficiency is improved, but the risk of accidental damage to critical structures increases
Solution Approach 1:
The patent replaces traditional sharp mechanical cutting instruments with an ultrasonic surgical instrument that uses high-frequency mechanical vibrations to dissect tissue. The ultrasonic blade oscillates at frequencies between 20-100 kHz, generating frictional heat and mechanical energy that selectively disrupts soft tissues while preserving firm structures like nerves and blood vessels. This substitution of cutting mechanism fundamentally reduces the risk of accidental damage to critical structures.
Solution Approach 2:
The invention changes the physical parameters of the dissection process by utilizing ultrasonic frequency vibrations instead of static sharp edges. The ultrasonic blade operates at specific amplitude and frequency parameters that create differential effects on tissues based on their mechanical properties. Soft tissues are disrupted at these parameters while firm tissues remain intact, providing selective dissection capability that resolves the contradiction between cutting efficiency and safety.
2Object-affected harmful factors
If blunt dissection is used to isolate embedded tissues, then safety against accidental cutting is improved, but the difficulty of differentiating between soft and firm tissues increases
Solution Approach 1:
The patent replaces manual blunt dissection techniques with an automated ultrasonic dissection system. The ultrasonic blade's high-frequency vibrations automatically differentiate between soft and firm tissues based on their mechanical impedance and energy absorption characteristics. This substitution eliminates the need for surgeon judgment in tissue differentiation while maintaining safety, as the ultrasonic energy selectively affects soft tissues without damaging firm structures like nerves and vessels.
Solution Approach 2:
The ultrasonic surgical instrument performs self-differentiation of tissues through its inherent physical properties. The ultrasonic blade automatically adapts its dissection effect based on the mechanical properties of the tissue it encounters, requiring no external control or judgment. The system serves itself by using the natural mechanical differences between soft and firm tissues to achieve selective dissection, thereby resolving the difficulty of tissue differentiation.
3Ease of operation
If traditional dissection methods are used during minimally invasive procedures, then accessibility to target structures is improved, but the risk of surgical error increases
Solution Approach 1:
The patent replaces traditional sharp and blunt dissection instruments used in minimally invasive surgery with an ultrasonic surgical instrument. The ultrasonic blade can be inserted through small incisions and trocars, maintaining the accessibility advantages of minimally invasive approaches. However, the ultrasonic mechanism provides automated tissue differentiation and selective dissection that reduces surgical errors, particularly in identifying and preserving critical structures like nerves and blood vessels that are difficult to visualize during minimally invasive procedures.
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 instrument enables safer and more efficient dissection of complex tissues by automatically disrupting soft tissues while preserving firm tissues, reducing the risk of complications and improving surgical precision.
Implementation Method 1
A differential dissecting instrument with a drive mechanism and tissue-engaging surface designed to selectively disrupt soft tissues while avoiding firm tissues, utilizing a rotary drive train and motion filter to convert rotational motion into planar oscillation
Data Source
AI summary
Methods and devices for blunt dissection include a drive mechanism comprising an elongate rotary drive train having a first proximal end connected to a mounting base for attaching to a handle or a surgical robot and a second distal end. The drive mechanism comprises a differential dissecting member (DDM) configured to be rotatably attached to the second distal end. The drive mechanism further comprises a mechanism configured to mechanically rotate the DDM about a substantially transverse axis of member rotational oscillation, thereby causing at least one tissue engaging surface to move in at least one direction against complex tissue and selectively engage the complex tissue such that when the DDM is pressed into the complex tissue, the at least one tissue engaging surface moves across the complex tissue and disrupts at least one soft tissue in the complex tissue, but does not disrupt firm tissue in the complex tissue.