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Pure Impact is indicated to be used for:

• Improvement of abdominal tone, for strengthening of the abdominal muscles, for development of firmer abdomen.
• Improvement of muscle tone and firmness, for strengthening muscles in arms, thighs and buttocks areas.
• The Pure Impact is intended to stimulate healthy muscles in order to improve or facilitate muscle performance. The Pure Impact is not intended to be used in conjunction with therapy or treatment of medical diseases or medical conditions of any kind. The various types of muscle work that the Pure Impact can impose on the stimulated muscles are able to improve or facilitate muscle performance. The Pure Impact may therefore be considered a technique of muscle training.

Pure Impact device provides both training and physical therapy using Electrical Muscle Stimulation (EMS). The EMS is provided through electrodes that are controlled by the Touch Control Module.

The system includes:

• Touch Control Module
• Pure Impact™ Wireless Stimulation Modules
• Pure Impact™ Electrode Pads
• Pure Impact™ Charging Station

The Touch Control Module runs the Pure Impact™ program and displays the user interface, which provides the full range of controls to identify the patient and the required treatment. The Pure Impact™ Wireless Stimulation Modules provide EMS to selected body locations on the patient and communicate to the Touch Control Module through Bluetooth Low Energy (BLE). Each Stimulation Module contains a main stimulation unit and several stimulation subunits, each of which is attached to a Pure Impact™ Electrode Pad placed on the patient. The Pure Impact™ Electrode Pads are disposable and intended for single patient, single use only. They contain a hydrogel adhesive to attach to the selected body locations on the patient and magnetic connectors to attach to the Stimulation Modules. The Pure Impact™ Charging Station charges the Stimulation Modules.

This FDA 510(k) clearance letter pertains to the Pure Impact device, a powered muscle stimulator. The clearance is based on demonstrating substantial equivalence to a predicate device, the Pure Impact Module of the SofWave System (K250146).

The document states that the Pure Impact device is a modification of the predicate, with the only changes being related to the standalone PC, GUI, and software updates. It explicitly states that no changes were made to the Pure Impact Charging Station Unit, Pure Impact Wireless Stimulation Modules, or Pure Impact Electrode Pads. Furthermore, the change does not affect the treatment protocols, stimulation parameters, or energy delivery.

Therefore, the performance data and acceptance criteria for electrical muscle stimulators (EMS) typically revolve around safety and technical specifications, rather than clinical efficacy or diagnostic accuracy, which would involve more complex studies like MRMC or ground truth assessment from expert consensus or pathology. This is because EMS devices, particularly those for muscle conditioning, are often cleared based on demonstrating that their technical characteristics (e.g., waveform, output, safety features) are equivalent to a legally marketed predicate device, and that these characteristics do not raise new questions of safety or effectiveness.

Given the information provided, which heavily emphasizes direct technical comparison and safety testing (electrical safety, EMC, software V&V), the "acceptance criteria" and "study that proves the device meets the acceptance criteria" are primarily framed around these technical and safety aspects, and the device's functional equivalence to its predicate. There is no mention of a clinical study assessing improvement in muscle tone or firmness with quantified metrics from human subjects, or any study involving human readers/experts for performance evaluation, as would be common for diagnostic AI/ML devices.

Here's a breakdown of the requested information based solely on the provided FDA 510(k) clearance letter:

1. Table of Acceptance Criteria and Reported Device Performance

For this device, the "acceptance criteria" are predominantly framed as mirroring the technical specifications and safety standards met by the predicate device, and ensuring the modified device continues to meet these.

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