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The Power Twin 21 is intended to provide topical heating for the purpose of elevating tissue temperature for the temporary relief of minor muscle and joint pain and stiffness, arthritis pain, or muscle spasm, the temporary increase in local blood circulation and/or promoting relaxation of muscle.

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This document is a 510(k) clearance letter from the FDA for a device called "Power Twin 21." It primarily addresses the regulatory approval process and states that the device is substantially equivalent to a legally marketed predicate device.

Critically, this document does not contain any information about acceptance criteria for device performance, nor does it describe any study proving the device meets such criteria.

Therefore, I cannot provide the requested information. The document focuses on regulatory classification and compliance, not on performance studies or clinical trial results. Manufacturers typically submit performance data in their 510(k) premarket notification, but that data is not included in the FDA's clearance letter itself.

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The 3B Laser Needle is intended to provide topical heating for the purpose of elevating tissue temperature for the temporary relief of minor muscle and joint pain and stiffness, arthritis pain, or muscle spasm, the temporary increase in local blood circulation and/or promoting relaxation of muscle.

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I am sorry, but based on the provided document, I cannot answer the request as it does not contain information about the acceptance criteria or a study proving that the device meets them. This document is an FDA 510(k) clearance letter for the 3B Laser Needle, stating that the device is substantially equivalent to legally marketed predicate devices. It outlines regulatory information, indications for use, and general controls, but it does not detail specific performance metrics, clinical study design, or results.

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