RF Neurotomy Needle Filaments for Offset Nerve Ablation
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Solution Overview
Problem
Existing thermal ablation technologies face challenges in providing adequate treatment to targeted tissue while sparing surrounding structures from injury, particularly in RF neurotomy procedures.
Innovation Solution
The use of needles with deployable filaments that can create asymmetrical offset lesions, allowing RF energy to be directed towards the target nerve and away from collateral structures, utilizing a monopolar electrode configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional RF ablation is used to treat target tissue, then thermal energy is delivered to the target volume, but surrounding structures are exposed to harmful thermal effects
Solution Approach 1:
The patent employs asymmetrical offset lesions where the RF electrode is positioned such that the lesion center is deliberately offset from the electrode tip. This asymmetric configuration allows the thermal field to be concentrated on the target nerve while the electrode remains positioned away from collateral structures, thereby treating the target effectively while minimizing harm to surrounding tissues
Solution Approach 2:
The patent creates a localized treatment zone by directing RF energy to produce a lesion with specific spatial characteristics. The asymmetrical lesion geometry concentrates thermal energy precisely where needed (on the target nerve) while leaving surrounding areas at lower temperatures, thus achieving local quality differentiation between the treatment zone and surrounding tissues
2Reliability
If RF energy is increased to improve ablation efficacy, then target nerve ablation is enhanced, but risk of damage to collateral structures increases
Solution Approach 1:
By creating an asymmetrical offset lesion where the lesion center is displaced from the electrode tip, the patent enables high RF power delivery to the target nerve while the electrode itself is positioned away from collateral structures. This asymmetric geometry decouples the relationship between electrode position and lesion center, allowing effective high-power ablation of the target while protecting surrounding tissues
Solution Approach 2:
The offset lesion configuration acts as an intermediary mechanism that mediates between the RF electrode and the target tissue. The lesion serves as the actual interface where thermal energy is concentrated on the target nerve, while the electrode remains positioned away from collateral structures, thus protecting them from direct thermal exposure even at high power levels
3Stability of the object's composition
If symmetrical lesions are created around the electrode, then uniform treatment is achieved, but precision in directing energy away from collateral structures is reduced
Solution Approach 1:
The patent deliberately employs asymmetry to achieve precision in energy direction. By offsetting the lesion center from the electrode tip, the system sacrifices perfect symmetry in exchange for the ability to precisely control where the thermal energy is concentrated, allowing the lesion to be positioned exactly where needed while keeping the electrode away from collateral 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
This approach effectively ablates targeted nerves while minimizing damage to surrounding tissues, enhancing the precision and efficacy of RF neurotomy procedures.
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
Systems and methods for radiofrequency neurotomy. Systems include needles with deployable filaments capable of producing lesions at target volumes, which may include a target nerve. Ablation of at least a portion of the target nerve may inhibit the ability of the nerve to transmit signals, such as pain signals, to the central nervous system. The lesion may facilitate procedures by directing energy towards the target nerve and away from collateral structures. Example anatomical structures include lumbar, thoracic, and cervical medial branch nerves and rami and the sacroiliac joint.