# US 2010/0168538 A1 · Method and/or system for sensor artifact filtering > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0168538 A1 - Document ID: US20100168538A1 - Status: Published application - Kind: A1 - Application number: 12/347,716 - Filed: 2008-12-31 - Published: 2010-07-01 - Earliest claimed: 2008-12-31 - Assignees: Medtronic MiniMed, Inc. - Inventors: Desmond Barry Keenan; John J. Mastrototaro - Web page: https://patentgrep.com/patent/US20100168538A1 ## CPC - A61B 5/6848: {Needles} - A61B 5/0031: {Implanted circuitry} - A61B 5/07: Endoradiosondes - A61B 5/14532: {for measuring glucose, e.g. by tissue impedance measurement} - A61B 5/14865: {invasive, e.g. introduced into the body by a catheter or needle or using implanted sensors} - A61B 5/4839: {combined with drug delivery} - A61B 5/6849: {in combination with a needle set} - A61B 5/7203: {for noise prevention, reduction or removal} - A61B 5/725: {using specific filters therefor, e.g. Kalman or adaptive filters (specific diagnostics methods using using bioelectric or biomagnetic signals A61B5/316)} - A61M 5/14244: {adapted to be carried by the patient, e.g. portable on the body} - A61M 5/1723: {using feedback of body parameters, e.g. blood sugar or pressure} - A61B 5/1411: {by percutaneous method, e.g. by lancet} - A61B 5/150022: {for capillary blood or interstitial fluid} - A61M 2205/3569: sublocal, e.g. between console and disposable - A61M 2205/3592: using telemetric means, e.g. radio or optical transmission - A61M 2230/201: Glucose concentration - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} ## Abstract Disclosed are a method and/or system for filtering sensor measurements. In one particular implementation, a sensor signal may be processed concurrently in a plurality of signal-filter paths. A particular signal-filter path may be selected to provide an output signal for obtaining a measurement based, at least in part, on a measurement of noise associated with the sensor signal. ## Claims ### Claim 1 A method comprising: providing a signal representative of a blood glucose concentration; and selecting an output signal for use in estimating said blood glucose concentration from among a plurality of signal-filter paths based, at least in part, on a measurement of noise associated with said signal. ### Claim 2 (depends on 1) The method of claim 1, and further comprising: generating said signal based upon a measurement of said blood glucose concentration; and obtaining said measurement of said noise contemporaneous with obtaining said measurement of said blood glucose concentration. ### Claim 3 (depends on 1) The method of claim 1, wherein said plurality of signal-filter paths comprises at least one signal-filter path with no filtering and at least one signal-filter path comprising a finite impulse response (FIR) filter. ### Claim 4 (depends on 3) The method of claim 3, and further comprising selecting said output signal from said at least one signal-filter path with no filtering if said measurement of said noise is below a threshold level. ### Claim 5 (depends on 1) The method of claim 1, and further comprising: high-pass filtering said signal to provide an isolated noise component; and determining said measurement of noise based, at least in part, on said isolated noise component. ### Claim 6 (depends on 1) The method of claim 1, and further comprising receiving said signal representative of said blood-glucose concentration from a blood-glucose sensor implanted in a patient. ### Claim 7 (depends on 1) The method of claim 1, and further comprising: selecting an output signal for use in estimating said blood glucose concentration from a different one of said plurality signal-filter paths based, at least in part, in a change in said measurement of noise. ### Claim 8 (depends on 1) The method of claim 1, wherein at least one signal-filter path comprises a seventh-order FIR filter. ### Claim 9 (depends on 1) The method of claim 1, wherein at least one signal-filter path comprises an infinite impulse response filter. ### Claim 10 (depends on 1) The method of claim 1, wherein at least one signal-filter path comprises a Kalman filter. ### Claim 11 An apparatus comprising: means for providing a signal representative of a blood glucose concentration; and means for selecting an output signal for use in estimating said blood glucose concentration from among a plurality of signal-filter paths based, at least in part, on a measurement of noise associated with said signal. ### Claim 12 (depends on 11) The apparatus method of claim 11, and further comprising: means for generating said signal based upon a measurement of said blood glucose concentration; and means for obtaining said measurement of said noise contemporaneous with obtaining said measurement of said blood glucose concentration. ### Claim 13 (depends on 11) The apparatus of claim 11, wherein said plurality of signal-filter paths comprises at least one signal-filter path with no filtering and at least one signal-filter path comprising a finite impulse response (FIR) filter. ### Claim 14 (depends on 13) The apparatus of claim 13, and further comprising means for selecting said output signal from said at least one signal-filter path with no filtering if said measurement of said noise is below a threshold level. ### Claim 15 (depends on 11) The apparatus of claim 11, and further comprising: means for high-pass filtering said signal to provide an isolated noise component; and means for determining said measurement of noise based, at least in part, on said isolated noise component. ### Claim 16 (depends on 11) The apparatus of claim 11, and further comprising means for receiving said signal representative of said blood-glucose concentration from a blood-glucose sensor implanted in a patient. ### Claim 17 (depends on 11) The apparatus of claim 11, and further comprising: means for selecting an output signal for use in estimating said blood glucose concentration from a different one of said plurality signal-filter paths based, at least in part, in a change in said measurement of noise. ### Claim 18 An apparatus comprising: a blood-glucose sensor to generate a sensor signal representative of a blood-glucose concentration in a patient; and a controller adapted to select an output signal for use in estimating said blood glucose concentration from among a plurality of signal-filter paths based, at least in part, on a measurement of noise associated with said sensor signal. ### Claim 19 (depends on 18) The apparatus of claim 18, and further comprising said plurality of filter-signal paths, said plurality of filter-signal paths being adapted to concurrently process sensor signal to provide respective candidate output signals. ### Claim 20 (depends on 19) The apparatus of claim 19, wherein said plurality of signal-filter paths comprises at least one signal-filter path with no filtering and at least one signal-filter path comprising a finite impulse response (FIR) filter. ### Claim 21 (depends on 18) The apparatus of claim 18, and further comprising: a high-pass filter to provide an isolated noise component, and wherein said controller is adapted to determine said measurement of noise based, at least in part, on said isolated noise component. ### Claim 22 (depends on 18) The apparatus of claim 18, and further comprising an insulin delivery system adapted to inject insulin into said patient in response to one or more control signals from said controller, said controller being adapted to generate said one or more control signals based, at least in part, on an estimate of said blood-glucose concentration. ### Claim 23 An article comprising: a storage medium comprising machine-readable instructions which, if executed by a computing platform, are adapted to direct said computing platform to: select an output signal for use in estimating a blood glucose concentration from among a plurality of signal-filter paths based, at least in part, on a measurement of noise associated with a signal representative of a blood-glucose concentration. ### Claim 24 (depends on 23) The article of claim 23, wherein said instructions, if executed by said computing platform, are further adapted to direct said computing platform to select said output signal from said at least one signal-filter path with no filtering if said measurement of said noise is below a threshold level. ### Claim 25 (depends on 23) The article of claim 23, wherein said instructions, if executed by said computing platform, are further adapted to direct said computing platform to select an output signal for use in estimating said blood glucose concentration from a different one of said plurality signal-filter paths based, at least in part, in a change in said measurement of noise.