Electrocautery Probe Wanding for Permanent Nerve Denervation
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Solution Overview
Problem
Current thermal ablation procedures for treating joint pain, such as RF ablation, face challenges in accurately targeting and permanently affecting sensory nerves due to limited access and anatomical variations, leading to temporary pain relief that requires repeated treatments.
Innovation Solution
The use of an electrocautery probe with increased size, rigidity, and power output allows for effective ablation and transection of target nerves by moving the distal tip in various directions to cover a larger treatment area, potentially leading to longer or permanent denervation of the nerve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a standard RF needle probe is used for ablation, then the treatment area is limited to approximately 4 mm2, but this limits the ability to cover anatomical variations and achieve permanent nerve denervation
Solution Approach 1:
The probe is designed to be movable during energy delivery, allowing the operator to wand the distal tip across the target nerve area. This dynamic application enables coverage of larger treatment areas (50-1000 mm2) while maintaining reliable nerve denervation by ensuring the nerve is affected throughout the wanding motion
Solution Approach 2:
The treatment approach transitions from a static point application (standard RF needle) to a dynamic area application (wanding motion). By moving the probe tip across the target area in multiple directions, the treatment extends from a single point into a two-dimensional zone, covering anatomical variations and ensuring complete nerve denervation
2Ease of operation
If access to the target nerve is limited to a restricted angular range, then needle insertion is constrained, but this makes it difficult to accurately locate and ablate the nerve
Solution Approach 1:
The procedure begins with preliminary localization of the target nerve using imaging guidance and anatomical landmarks before probe insertion. This preliminary positioning ensures that even with restricted angular access, the probe can be accurately directed to the nerve location once inserted
Solution Approach 2:
Imaging guidance serves as an intermediary tool that bridges the gap between restricted physical access and accurate nerve localization. The imaging system provides real-time feedback, allowing precise positioning of the probe tip at the target nerve despite limitations in insertion angles
3Ease of operation
If a flexible needle is used for pinpoint target insertion, then access to restricted areas is improved, but the needle must be removed and reinserted for different nerves, reducing efficiency
Solution Approach 1:
The electrocautery probe is designed with multi-functionality, serving both as a localization tool and as the ablation instrument. The probe can be wanded to treat multiple nerves and treatment areas through a single insertion, eliminating the need for repeated insertions and improving overall treatment efficiency
Solution Approach 2:
The wanding motion allows continuous application of RF energy across multiple target areas without removing the probe. The operator can move the probe tip continuously across different nerves and treatment zones, maintaining uninterrupted therapeutic action and significantly improving productivity compared to discrete insertion-removal cycles
4Ease of operation
If RF ablation energy is delivered through a stationary needle, then the treatment is simple to perform, but the effect is temporary requiring repeated treatments every 6-12 months
Solution Approach 1:
The transition from stationary to dynamic probe application enables more complete and uniform nerve denervation. By wanding the probe across the target area, all portions of the nerve are exposed to therapeutic energy, creating more extensive tissue damage that prevents nerve regeneration and extends pain relief duration
Solution Approach 2:
The treatment parameters are changed by increasing the treatment area from 4 mm2 to 50-1000 mm2 through wanding motion. This parameter change in treatment area coverage delivers sufficient energy to a larger volume of nerve tissue, creating more robust and long-lasting denervation effects
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
This approach enhances clinical outcomes by increasing the likelihood of effectively targeting and permanently affecting the nerve, reducing joint pain and improving joint mobility with potentially longer-lasting results compared to traditional RF ablation methods.
Implementation Method 1
RF ablation uses electrical energy transmitted into a target volume through an electrode to generate heat in the area of the electrode tip. The radio waves emanate from a non-insulated distal portion of the electrode tip. The introduced radiofrequency energy causes molecular strain, or ionic agitation, in the area surrounding the electrode as the current flows from the electrode tip to ground. The resulting strain causes the temperature in the area surrounding the electrode tip to rise.
Data Source
AI summary
A cautery probe is provided for performing a rhizotomy through an incision in the body of a patient. The probe includes a rigid shaft that can be inserted through an incision, and a distal cutting tip that can be energized and wanded across a target nerve. In embodiments, the probe also includes connectors for attaching a syringe, drawing medication into the syringe, and dispensing medication from the syringe through the probe and adjacent the cutting tip.