Asahi Intecc has been granted a patent for a radiofrequency guidewire that includes a core wire and a tip structure with one or more edge surfaces. The tip structure has an area of reduced curvature radius, which generates a higher electric field during the delivery of radiofrequency energy. The patent also discloses a method of using the guidewire for ablating an occlusion. GlobalData’s report on Asahi Intecc gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Asahi Intecc, Shapeable guide catheters was a key innovation area identified from patents. Asahi Intecc's grant share as of September 2023 was 21%. Grant share is based on the ratio of number of grants to total number of patents.

Patent granted for a radiofrequency guidewire with enhanced ablation capabilities

Source: United States Patent and Trademark Office (USPTO). Credit: Asahi Intecc Co Ltd

A recently granted patent (Publication Number: US11717334B2) describes a radiofrequency guidewire and a method for treating a body region using this guidewire. The guidewire includes a core wire that can be connected to a radiofrequency generator, and a tip structure attached to the distal end of the core wire. The tip structure has a semi-hemispherical base portion and a tapered section that leads to a flat distal tip. The tapered section has a reduced radius of curvature compared to the base portion, and it extends from a first circumferential edge surface to a second circumferential edge surface. These edge surfaces create outer facing corners that generate a higher electric field in a forward radial direction during the delivery of radiofrequency energy.

The guidewire also includes an outer insulation layer along the core wire, and a collar structure located near the tip structure. The collar structure provides insulation and encapsulates the tip structure within a dielectric barrier. It is made of a material with a higher melting temperature than the outer insulation layer. The collar structure is designed to impede the propagation of vapor bubbles or shockwaves generated at the tip structure towards the core wire.

The method for treating a body region involves delivering the guidewire to the desired area and positioning an opposing electrode near the tip structure. Radiofrequency energy is then delivered through the guidewire, generating an electrical field that is strongest at the first and second circumferential edge surfaces of the tip structure. This generates a plasma at these surfaces, which is used to treat the body region.

The patent also mentions variations in the core wire, such as a smaller diameter distal core wire section, and the inclusion of resistive elements and a coil structure along the inner surface of the outer insulation layer. The opposing electrode can be another guidewire or an area of the patient's skin. The body region being treated can be an occlusion in a blood vessel, a duct, or various types of tissues like the prostate gland, a tumor, or cardiac tissue.

Overall, this patent describes a radiofrequency guidewire and a method for using it to treat various body regions. The unique design of the tip structure and the inclusion of the collar structure aim to enhance the effectiveness and safety of the treatment by generating a higher electric field and impeding the propagation of unwanted effects towards the core wire.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.