Medical treatment system and methods using a plurality of fluid lines

US11400272B2 · kind B2 · utility

Assignee

• DEKA Products Limited Parternship · US

Inventors

• Michael G. Norris · Manchester, US
• Jacob W. Scarpaci · Manchester, US
• Robert J. Bryant · Manchester, US
• Geoffrey P. Spencer · Manchester, US
• David J. Hibbard · Bedford, US
• James D. Dale · Nashua, US
• John M. Kerwin · Manchester, US
• Andrew S. Coll · Manchester, US
• David A. Beavers · Manchester, US
• David W. McGill · Alpharetta, US
• Simon C. Helmore · San Francisco, US
• David B. Doherty · Litchfield, US
• Edgar J. Bolton · Newton, US
• Jinsun Yoo · Melrose, US
• Paul G. Girouard · Allenstown, US
• Daniel S. Karol · Southborough, US
• Daniel B. Singer · Lowell, US
• Joseph P. Rushlow · Belmont, US

Key dates

• Filing date: Aug 24, 2018
• Grant date: Aug 2, 2022
• Expiry date: Mar 24, 2041

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M2205/6063
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

Improvements in fluid volume measurement systems are disclosed for a pneumatically actuated diaphragm pump in general, and a peritoneal dialysis cycler using a pump cassette in particular. Pump fluid volume measurements are based on pressure measurements in a pump control chamber and a reference chamber in a two-chamber model, with different sections of an apparatus being modeled using a combination of adiabatic, isothermal and polytropic processes. Real time or instantaneous fluid flow measurements in a pump chamber of the diaphragm pump are also disclosed, in this case using a one-chamber ideal gas model and using a high speed processor to obtain and process pump control chamber pressures during fluid flow into or out of the pump chamber.