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Majerus SJA, Hanzlicek B, Hacohen Y, Cabal D, Bourbeau D, Damaser MS. Wireless and Catheter-Free Bladder Pressure and Volume Sensor. IEEE Sens J 2024; 24:7308-7316. [PMID: 38500510 PMCID: PMC10947133 DOI: 10.1109/jsen.2023.3267749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/20/2024]
Abstract
Continuous monitoring of bladder activity during normal daily activities would improve clinical diagnostics and understanding of the mechanisms underlying bladder function, or help validate how differing neuromodulation strategies affect the bladder. This work describes a urological monitor of conscious activity (UroMOCA). The UroMOCA included a pressure sensor, urine impedance-sensing electrodes, and wireless battery recharge and data transmission circuitry. Components were assembled on a circuit board and encapsulated with an epoxy/silicone molded package that allowed Pt-Ir electrode feedthrough for urine contact. Packaged UroMOCAs measured 12 × 18 × 6 mm. UroMOCAs continuously transmitted data from all onboard sensors at 10 Hz at 30 cm range, and ran for up to 44 hours between wireless recharges. After in vitro calibration, implantations were performed in 11 animals. Animals carried the device for 28 days, enabling many observations of bladder behavior during natural, conscious behavior. In vivo testing confirmed the UroMOCA did not impact bladder function after a two-week healing period. Pressure data in vivo were highly correlated to a reference catheter used during an anesthetized follow-up. Static volume sensor data were less accurate, but demonstrated reliable detection of bladder volume decreases, and distinguished between voiding and non-voiding bladder events.
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Affiliation(s)
- Steve J A Majerus
- Dept. of Electrical, Computer, and Systems Engineering, Case Western Reserve University, OH, USA
- Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, OH, USA
| | - Brett Hanzlicek
- Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, OH, USA
| | - Yaneev Hacohen
- Dept. of Electrical, Computer, and Systems Engineering, Case Western Reserve University, OH, USA
- Dept. of Biomedical Engineering of the Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Dario Cabal
- Dept. of Electrical, Computer, and Systems Engineering, Case Western Reserve University, OH, USA
| | - Dennis Bourbeau
- Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, OH, USA
- MetroHealth Medical Center, Cleveland, OH, USA
| | - Margot S Damaser
- Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, OH, USA
- Dept. of Biomedical Engineering of the Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
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Majerus SJA, Cabal D, Hacohen Y, Hanzlicek B, Smiley A, Wang Y, Liu W, Larauche M, Million M, Damaser MS, Bourbeau DJ. A Flexible Implant for Multi-Day Monitoring of Colon Segment Activity. IEEE Trans Biomed Circuits Syst 2023; 17:941-951. [PMID: 37363840 PMCID: PMC10732233 DOI: 10.1109/tbcas.2023.3289768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/28/2023]
Abstract
Monitoring of colon activity is currently limited to tethered systems like anorectal manometry. These systems have significant drawbacks, but fundamentally limit the observation time of colon activity, reducing the likelihood of detecting specific clinical events. While significant technological advancement has been directed to mobile sensor capsules, this work describes the development and feasibility of a stationary sensor for describing the coordinated activity between neighboring segments of the colon. Unlike wireless capsules, this device remains in position and measures propagating pressure waves and impedances between colon segments to describe activity and motility. This low-power, flexible, wireless sensor-the colon monitor to capture activity (ColoMOCA) was validated in situ and in vivo over seven days of implantation. The ColoMOCA diameter was similar to common endoscopes to allow for minimally invasive diagnostic placement. The ColoMOCA included two pressure sensors, and three impedance-sensing electrodes arranged to describe the differential pressures and motility between adjacent colon segments. To prevent damage after placement in the colon, the ColoMOCA was fabricated with a flexible polyimide circuit board and a silicone rubber housing. The resulting device was highly flexible and suitable for surgical attachment to the colon wall. In vivo testing performed in eleven animals demonstrated suitability of both short term (less than 3 hours) and 7-day implantations. Data collected wirelessly from animal experiments demonstrated the ColoMOCA described colon activity similarly to wired catheters and allowed untethered, conscious monitoring of organ behavior.
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Cabal D, Majerus S, Hacohen Y, Hanzlicek B, Damaser M, Bourbeau D. Median Filter Data Analysis of Bowel Activity using Wireless Intracolonic Sensor. FASEB J 2022. [DOI: 10.1096/fasebj.2022.36.s1.r4866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Dario Cabal
- Biomedical EngineeringCleveland Clinic Lerner Research InstituteClevelandOH
| | - Steve Majerus
- Advanced Platform Technology CenterLouis Stokes Cleveland Veterans Affairs Medical CenterClevelandOH
| | - Yaneev Hacohen
- Biomedical EngineeringCleveland Clinic Lerner Research InstituteClevelandOH
| | - Brett Hanzlicek
- Advanced Platform Technology CenterLouis Stokes Cleveland Veterans Affairs Medical CenterClevelandOH
| | - Margot Damaser
- Biomedical EngineeringCleveland Clinic Lerner Research InstituteClevelandOH
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