Oscillating Blade Tissue Resection Device
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Solution Overview
Problem
Existing surgical instruments for resecting soft tissue or bone face challenges such as poor ergonomics leading to musculoskeletal disorders, slow resection rates, inaccurate removal, potential nerve damage, and obstruction of the surgical site.
Innovation Solution
The development of powered cutting systems with oscillating or continuously rotating blades, or axially oscillating blades, to manipulate the border of targeted tissue. These systems include mechanisms for achieving oscillation, ergonomic design, and features for precise control and visualization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manually operated instruments are used for tissue resection, then the surgeon can control the cutting process, but the resection rate is slow and requires high muscle activation leading to fatigue
Solution Approach 1:
The patent replaces manual mechanical operation with a powered oscillating cutting system. The oscillating blade is driven by a motorized mechanism that converts rotational motion into reciprocating linear motion, eliminating the need for surgeon muscle activation while maintaining precise control through ergonomic handpiece design.
Solution Approach 2:
The cutting blade operates through periodic oscillating motion rather than continuous rotation or manual pushing. This reciprocating movement allows the blade to engage and disengage from tissue in controlled cycles, enabling faster resection rates while reducing sustained muscle activation requirements.
2Productivity
If a rotating blade is used for tissue resection, then cutting can be performed efficiently, but there is potential damage to sensitive nerves and vessels due to movement of the cutting tool relative to soft tissue
Solution Approach 1:
The blade performs periodic oscillating motion with controlled amplitude and frequency rather than continuous rotation. This allows brief engagement with tissue followed by disengagement, reducing the time sensitive structures are exposed to cutting forces while maintaining efficient resection through repeated cycles.
Solution Approach 2:
The oscillating blade utilizes high-frequency mechanical vibration to perform cutting. The rapid reciprocating motion allows the blade to vibrate through tissue with minimal lateral movement, reducing the risk of damaging adjacent nerves and vessels compared to slower rotating blades.
3Object-affected harmful factors
If the surgical site is accessed through narrow ports or retractors for minimally invasive procedures, then patient trauma is reduced and recovery is faster, but the difficulty of performing tissue resection operations increases
Solution Approach 1:
The cutting blade is divided into segmented or modular components that can be exchanged or adjusted. This allows selection of different blade sizes, shapes, and oscillation characteristics to match specific surgical requirements through narrow access ports, making minimally invasive resection more manageable.
Solution Approach 2:
The handpiece and blade assembly are designed with dynamic characteristics that allow precise control through narrow ports. The oscillating mechanism provides inherent stability that reduces the need for excessive surgeon force, enabling effective resection even when accessed through constrained minimally invasive pathways.
4Productivity
If current instruments like a burr are used to perform resection without making a straight cut, then resection can be performed, but there is risk of resecting either too much or too little bone
Solution Approach 1:
The oscillating blade is positioned and aligned before engagement with the bone, allowing preliminary positioning to ensure the correct cut path. The controlled reciprocating motion enables the surgeon to establish the desired cut trajectory in advance, preventing both over-resection and under-resection.
Solution Approach 2:
The controlled oscillating motion provides tactile feedback to the surgeon during cutting, allowing real-time adjustment of cutting depth and direction. This feedback mechanism enables precise control of the resection boundaries, ensuring accurate removal of the intended amount of bone without compromising surrounding structures.
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 powered cutting systems enhance precision and efficiency in tissue resection, reduce the risk of nerve damage, and improve the surgeon's view of the surgical site, thereby reducing unintentional trauma and facilitating more accurate procedures.
Implementation Method 1
utilize powered cutting systems with an oscillating or continuously rotating blade, or an axially oscillating blade, to manipulate the border of targeted tissue
Implementation Method 2
The drive mechanism can include a four bar linkage oscillator that converts rotation from a motor coupled to the drive mechanism into the oscillating force
Implementation Method 3
The drive mechanism can include an eccentric shaft having an offset bearing coupled with a linear bearing to generate the oscillating force
Implementation Method 4
The drive mechanism can include a cam mechanism configured to produce the oscillating axial motion of the cutting edge
Implementation Method 5
The drive mechanism can include a piezoelectric mechanism configured to produce the oscillating axial motion of the cutting edge
Data Source
AI summary
Embodiments of bone and tissue resection devices are disclosed herein. In one embodiment, a device can include a stationary assembly having a housing, an elongated sleeve extending distally from the housing, and a cutting region disposed distal to the sleeve. The device can further include a drive assembly having a blade shaft extending through the elongated sleeve, the blade shaft having a distal tip with a cutting surface configured to extend into the cutting region when the drive assembly advances distally relative to the stationary assembly. The drive assembly can further include an oscillator coupled to the blade shaft and configured to engage with a source of continuous rotational motion to convert the continuous rotational motion into oscillating motion of the drive shaft. Further, the drive assembly can be configured to slidably couple to the stationary assembly to permit selective translation of the drive assembly relative to the stationary assembly.