# US 11,433,205 B2 · Breathing apparatus provided with a breath-synchronized motor fan > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,433,205 B2 - Document ID: US11433205B2 - Status: Granted - Kind: B2 - Application number: 16/321,122 - Filed: 2017-04-13 - Published: 2019-05-30 - Granted: 2022-09-06 - Earliest claimed: 2016-07-26 - Assignees: Shigematsu Works Co., Ltd. - Applicants: Shigematsu Works Co., Ltd. - Inventors: Wataru Saitou; Kenichi Ono; Hiroyuki Ide - Web page: https://patentgrep.com/patent/US11433205B2 ## CPC - A61M 16/06: Respiratory or anaesthetic masks - A61M 16/0069: {the speed thereof being controlled by respiratory parameters, e.g. by inhalation} - A61M 16/024: {including calculation means, e.g. using a processor} - A61M 16/107: {in the inspiratory path} - A62B 18/006: {with pumps for forced ventilation (A62B18/045 takes precedence)} - A62B 18/08: Component parts for gas-masks or gas-helmets, e.g. windows, straps, speech transmitters, signal-devices (eye-pieces for protective goggles A61F9/02; composition of materials for the windows or other transparent parts A62D7/00) - A61M 16/208: {Non-controlled one-way valves, e.g. exhalation, check, pop-off non-rebreathing valves} - A61M 2016/0015: {inhalation detectors} - A61M 2205/3365: Rotational speed - A61M 2205/6063: Optical identification systems - A61M 2205/707: Testing of filters for clogging - A61M 2205/7545: for solid matter, e.g. microaggregates - A61M 2205/7563: with means preventing clogging of filters - A61M 2205/8212: with means or measures taken for minimising energy consumption - A62B 18/10: Valves - Y02B 30/70: Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating - 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)} - A62B: DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING (valves specially adapted for medical use A61M39/00; life-saving devices, apparatus or methods specially adapted for use in water B63C9/00; divers' equipment B63C11/00; specially adopted for use with aircraft, e.g. parachutes, ejector seats, {B64D17/00, B64D25/10}; rescue devices peculiar to mining E21F11/00) - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract An object of the present invention is to provide a breathing apparatus, wherein current for keeping internal pressure of the face piece at a predetermined positive target value at the time of inhale is not applied to the motor fan in a large amount at the start of current application to the motor fan, and the internal pressure of the face piece is prevented from becoming far below the predetermined positive target value immediately after start of current application to the motor fan so as to keep the internal pressure of the face piece at the predetermined positive target value at the time of inhale. A breathing apparatus provided with a breath-synchronized motor fan comprising a face piece for covering a part of or all of a face of a user, an inhale valve and an exhale valve attached to the face piece, a motor fan for supplying internal space of the face piece with external air through the inhale valve, a filter for cleaning the external air to be sucked into the motor fan, a breath monitoring apparatus provided with a membrane member deforming in accordance with fluctuation of internal pressure of the face piece and a sensor for detecting the deformation of the membrane member, and a controller for controlling operation of the motor fan synchronously with breathing of the user in accordance with a detection signal from the breath monitoring apparatus, wherein the controller applies current to the motor fan at the time of inhalation so as to keep the internal pressure of the face piece at a predetermined positive target value, and stops current application to the motor fan so as to stop the motor fan at the time of exhalation, and wherein the controller applies micro-current to the motor fan so as to rotate the motor fan at extremely low speed from the middle of exhalation to inhalation. ## Claims ### Claim 1 A breathing apparatus comprising a face piece for covering a part of or all of a face of a user, an inhale valve and an exhale valve attached to the face piece, a motor fan directly attached to the face piece for supplying internal space of the face piece with external air through the inhale valve, a filter for cleaning the external air to be sucked into the motor fan, a breath monitoring apparatus provided with a membrane member deforming in accordance with fluctuation of internal pressure of the face piece and a sensor for detecting the deformation of the membrane member, and a controller for controlling operation of the motor fan synchronously with breathing of the user in accordance with a detection signal from the breath monitoring apparatus, wherein the controller is configured to apply current to the motor fan at the time of inhalation so as to keep the internal pressure of the face piece at a predetermined positive target value, and stop current application to the motor fan so as to stop the motor fan at the time of exhalation, and wherein the controller is further configured to start a current application to the motor fan after start of the exhalation and before internal pressure of the face piece reaches maximum exhalation pressure and continue the current application to the motor fan to inhalation.