SYSTEMS AND METHODS FOR MONITORING COOLING OF SKIN AND TISSUE TO IDENTIFY FREEZE EVENTS
First Claim
1. A non-invasive treatment system for removing heat from a subject'"'"'s subcutaneous tissue, the treatment system comprising:
- a treatment device configured to contact an area of the subject'"'"'s skin and remove heat from the tissue located below the contacted area of skin;
a first sensor that measures a characteristic of at least one of the treatment device, the tissue, and the skin, the sensor being configured to output a first signal;
a signal processor programmed to estimate a noise characteristic of the first signal and based on the estimated noise characteristic to adaptively filter the first signal to provide at least one filtered first signal, wherein the signal processor is programmed to use the filtered first signal to determine whether at least a partial freeze event has occurred; and
a controlling device that modifies operation of the treatment device upon the determination of the at least partial freeze event.
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Accused Products
Abstract
A system and method of detecting, evaluating, monitoring events during the removal of heat from tissue beneath skin. The system utilizes an adaptive filter to determine if a partial freeze event is occurring, and performs an action based on the determination. In some examples, the system shuts off the treatment device, alerts an operator, reduces the cooling, and/or limits an amount of further cooling, in response to a determined treatment event. The system further applies a plurality of algorithms to detected signals in parallel to arrive at a plurality of estimates of whether a freeze event is occurring and confidences associated with the estimates. The estimates are used to evaluate whether the freeze event is in fact occurring.
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Citations
18 Claims
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1. A non-invasive treatment system for removing heat from a subject'"'"'s subcutaneous tissue, the treatment system comprising:
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a treatment device configured to contact an area of the subject'"'"'s skin and remove heat from the tissue located below the contacted area of skin; a first sensor that measures a characteristic of at least one of the treatment device, the tissue, and the skin, the sensor being configured to output a first signal; a signal processor programmed to estimate a noise characteristic of the first signal and based on the estimated noise characteristic to adaptively filter the first signal to provide at least one filtered first signal, wherein the signal processor is programmed to use the filtered first signal to determine whether at least a partial freeze event has occurred; and a controlling device that modifies operation of the treatment device upon the determination of the at least partial freeze event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A non-invasive treatment system for transdermally removing heat from tissue beneath a subject'"'"'s skin, the treatment system comprising:
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a treatment device configured to contact an area of the skin and remove heat from the tissue located below the contacted area of skin; a first sensor that measures a characteristic of at least one of the treatment device, the tissue, and the skin, wherein the sensor is configured to output a first signal; and a signal processor programmed to estimate a noise characteristic of the first signal and determine whether at least a partial freeze event has occurred, the determination being based in part on the estimated noise characteristic such that a partial freeze event is determined to not have occurred when the estimated noise characteristic exceeds a predetermined noise characteristic value. - View Dependent Claims (13)
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14. A method for removing heat from tissue beneath skin and detecting a freeze event in the presence of motion, the method comprising:
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a. removing heat from tissue located below a skin surface using a treatment device; b. measuring a characteristic of at least one of the treatment device, the tissue, and the skin using a sensor, the sensor outputting a first signal; c. adaptively filtering the first signal to create a filtered signal to eliminate motion artifact and read through motion induced signal noise; and d. determining whether a freeze event is or has occurred based on analysis of the filtered signal.
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15. A non-invasive treatment system for transdermally removing heat from tissue beneath a subject'"'"'s skin, the treatment system comprising:
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a treatment device configured to contact an area of the skin and remove heat from the tissue located below the contacted area of skin; a sensor that measures a characteristic of at least one of the treatment device, the tissue, and the skin, the sensor configured to output a signal; and a controlling device that receives the signal and modifies operation of the treatment device upon determining at least a partial freeze event has occurred, the controlling device including a signal processor programmed to; determine a first likelihood of the freeze event occurring using a first filtering algorithm on the output signal, determine a second likelihood of the freeze event occurring using a second filtering algorithm on the output signal, and determine whether the freeze event is occurring based on the first and second likelihoods. - View Dependent Claims (16, 17, 18)
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Specification