Air flow recorder, generator and analysis system for inhalation device testing and modeling

• US 5,622,164 A
• Filed: 02/16/1994
• Issued: 04/22/1997
• Est. Priority Date: 05/15/1992
• Status: Expired due to Fees

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Stone, Harold E., Kilis, David
• Primary Examiner(s): Asher, Kimberly L.
• Application Number:
  US08/197,365
• Time in Patent Office: 1,161 Days
• Field of Search: 128/200.23, 128/200.24, 128/204.18, 128/204.21, 128/204.23, 128/719, 128/716, 128/725, 128/630, 128/202.13, 434/262
• US Class Current: 128/200.24
• CPC Class Codes: A61M 15/00 Inhalators drug delivery in endotracheal tubes A61M16/04
• CPC Class Codes: A61M 2209/02 Equipment for testing the apparatus
• CPC Class Codes: A62B 27/00 Methods or devices for testing respiratory or breathing apparatus for high altitudesapparatus for testing gastightness in general G01M

Abstract

An air flow device for use in recording, analyzing, replicating, and generating breathing patterns. A piping structure provides receipt and transfer of pressurized gas through the device. The piping structure has a source connection for receiving a single constant source of pressurized gas. Aspirators are connected to the piping structure for receiving pressurized gas from the source connection and for selectively creating an output pressurization comprising a positive pressure gas flow and a negative pressure gas flow at a proportional solenoid valve. A balancing valve is connected to the piping structure for controlling and calibrating the output pressurization of the aspirators. A control system provides control of the aspirators, the balancing valve, and a solenoid valve. A solenoid valve is mechanically connected to the piping structure with pneumatic input and output connections and electronically connected to the control system with data input and output connections. The solenoid valve provides patterned pneumatic flow between the aspirators and a system model according to air flow commands received by the solenoid from the control system. The system model, in one embodiment, is a breath actuated inhaler device.

Claims

1. An air flow device for use in recording, analyzing, replicating, and generating, breathing patterns, comprising:

a) piping structure for receipt and transfer of pressurized gas therethrough, the piping structure having a source connection for receiving a single constant pressure source of pressurized gas;

b) aspiration means connected to the piping structure for receiving pressurized gas from the source connection and for selectively creating an output pressurization comprising a positive pressure gas flow and a negative pressure gas flow at a proportional solenoid valve;

c) a balancing valve connected to the piping structure for controlling and calibrating the output pressurization of the aspiration means;

d) control means for controlling the aspiration means, the balancing valve, and a proportional solenoid valve; and

e) a proportional solenoid valve mechanically connected to the piping structure with pneumatic input and output connections and electronically connected to the control means with data input and output connections, the proportional solenoid valve providing patterned pneumatic flow between the aspiration means and a system model according to air flow commands received by the proportional solenoid valve from the control means.

2. The device of claim 1, wherein the aspiration means comprises a first aspirator configured for providing a negative pressure output and a second aspirator for providing a positive pressure output.

3. The device of claim 1, further comprising a pressure regulator.

4. The device of claim 1, further comprising an air filter.

5. The device of claim 1, wherein the balancing valve comprises input means for adjusting the peak flow rate of the positive pressure gas flow and the negative pressure gas flow.

6. The device of claim 1, wherein the balancing valve comprises input means for adjusting the symmetry of the gas flow between the positive pressure gas and the negative pressure gas.

7. The device of claim 1, wherein the control means comprises input means for adjusting the symmetry of the gas flow between the positive pressure gas flow and the negative pressure gas flow.

8. The device of claim 1, wherein the proportional solenoid valve receives breathing pattern signals from the control means which operate the proportional solenoid valve to permit flow of the pressurized gas to the system model to replicate a designated breathing pattern.

9. The device of claim 8, wherein the breathing pattern is selected from a list of breathing patterns including an inspiratory, an expiratory, a combined inspiratory and expiratory, a constant flow, an increasing ramp flow, a decreasing ramp flow, and a variable flow pattern.

10. The device of claim 1, further comprising a humidity simulation and detection unit.

11. The device of claim 1, further comprising a temperature simulation and detection unit.

12. An air flow system comprising:

a) piping structure for receipt and transfer of pressurized gas therethrough, the piping structure having a source connection for receiving a single constant pressure source of pressurized gas;

b) aspiration means connected to the piping structure for receiving pressurized gas from the source connection and for selectively creating an output pressurization comprising a positive pressure gas flow and a negative pressure gas flow at a proportional solenoid valve;

c) a balancing valve connected to the piping structure for controlling and calibrating the output pressurization of the aspiration means;

d) control means for controlling the aspiration means, the balancing valve, and a proportional solenoid valve;

e) a breath actuated inhaler device; and

f) a proportional solenoid valve mechanically connected to the piping structure with pneumatic input and output connections and electronically connected to the control means with data input and output connections, the proportional solenoid valve providing patterned pneumatic flow between the aspiration means and the breath actuated inhaler device, the pneumatic flow being controlled and patterned according to air flow commands received by the proportional solenoid valve from the control means.

13. An air flow system according to claim 12, wherein the balancing valve comprises input means for adjusting the peak flow rate of the positive pressure gas flow and the negative pressure gas flow.