Percutaneous Electrocautery Probe Wanding for Nerve Ablation
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Solution Overview
Problem
Current thermal ablation procedures for treating joint pain, such as rhizotomies, face challenges in accurately targeting and permanently ablating sensory nerves while minimizing damage to surrounding tissues. Existing methods often require multiple needle insertions and have temporary effects, necessitating repeated treatments.
Innovation Solution
The use of an electrocautery probe with increased size, rigidity, and power output allows for percutaneous navigation and energy delivery to target nerves. The probe is advanced through a small incision and moved in various directions to effectively ablate and transect nerves, providing a larger treatment area compared to traditional RF ablation needles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a small flexible RF needle is used for pinpoint targeting, then measurement precision is improved, but reliability of permanent nerve ablation deteriorates
Solution Approach 1:
The patent changes the key parameters of the ablation device from a small flexible needle to a larger rigid probe with increased power output. This parameter change enables the probe to deliver sufficient energy for permanent nerve transection while maintaining percutaneous delivery capability through a small incision.
Solution Approach 2:
The patent introduces dynamic movement of the probe tip in multiple directions (wanding motion) during energy delivery. This dynamic approach allows the operator to sweep the energy field across a larger tissue volume, increasing the likelihood of intercepting and permanently ablating the target nerve while maintaining precise directional control.
2Ease of operation
If a small incision is used for percutaneous access, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The probe is segmented into distinct functional zones: a rigid shaft for structural support and percutaneous delivery, a guarded portion for insulation and protection, and an exposed distal tip for energy delivery. This segmentation allows each portion to be optimized for its specific function while enabling delivery through a small incision.
Solution Approach 2:
The probe design incorporates a guarded portion that surrounds the electrical conductor, with the exposed distal tip extending beyond the guard. This nested structure protects the electrical components during insertion while allowing energy delivery at the tip, combining protection and functionality in a compact percutaneous device.
3Ease of operation
If traditional RF ablation is used, then ease of operation is maintained, but duration of action deteriorates
Solution Approach 1:
The patent employs a disposable probe design that is used once and then discarded. This allows the use of a more complex, higher-power probe configuration optimized for permanent nerve ablation without requiring expensive sterilization and reuse protocols, thereby achieving longer-lasting results while maintaining procedural simplicity.
4Reliability
If multiple needle insertions are performed, then reliability of nerve targeting is improved, but productivity deteriorates
Solution Approach 1:
The single percutaneous probe is designed to perform multiple functions: navigation through tissue, precise positioning adjacent to the target nerve, and delivery of sufficient energy for permanent ablation. This multi-functional design eliminates the need for multiple separate needle insertions while maintaining reliable nerve targeting and improving procedural efficiency.
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 denervating sensory nerves, potentially leading to longer-lasting or permanent pain relief with fewer procedural interventions.
Implementation Method 1
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.
Implementation Method 2
Thermal ablation involves the creation of temperature changes sufficient to produce necrosis in a specific target tissue within a patient and, in this case, particularly at the joint. The target tissue for treatment of joint pain is the sensory nerve.
Data Source
AI summary
A method of performing a rhizotomy includes directing a surgical probe through an incision in the body of a patient, navigating a distal tip of the probe to a location adjacent a target nerve, energizing the probe to deliver energy to the target nerve, and wanding the distal tip of the probe in a plurality of directions to direct the energy at the target nerve to interrupt signal transmission by the target nerve.