Systems And Methods For Providing A Pulse Of A Therapeutic Gas With A Desired Flow Profile To Maximize Therapeutic Effectiveness
Described are systems and methods for providing a pulse of a therapeutic gas with a desired flow profile to maximize therapeutic effectiveness. Systems and methods of the present disclosure can generate and/or provide desired flow profiles with various shapes and/or properties by configuring, modifying, optimizing, and/or factoring in aspects of at least one fixed flow rate assembly of a therapeutic gas delivery system such as, but not limited to, spatial relationships of elements of the fixed flow rate assembly, rate of valve closure and opening, latent flows, transient wave generation and/or propagation, to name a few.
1 . A system for providing a pulse of a pharmaceutical gas having a desired flow profile to deliver to a patient, the system comprising:
a first fixed flow rate assembly including a first fixed flow valve in fluid communication with a first fixed flow orifice, the first fixed flow valve being (1) a fixed flow valve that rapidly opens and rapidly closes, (2) located upstream or downstream of first fixed flow orifice and (3) at a volumetric offset from the first fixed flow orifice; and
a flow delivery control that rapidly opens and rapidly closes the first fixed flow orifice located at least one of upstream or downstream of, and at the volumetric offset from, the first fixed flow valve to provide a pulse of a pharmaceutical gas having a desired flow profile to a patient.
2 . The system of claim 1 , wherein the pulse of a pharmaceutical gas having a desired flow profile is provided to a patient to treat at least one of chronic obstructive pulmonary disease (COPD), idiopathic pulmonary fibrosis (IPF), and pulmonary hypertension (PH).
3 . The system of claim 1 , wherein when the first fixed flow orifice is upstream to the first fixed flow valve at least one of (1) an initial flow spike in volume of transient therapeutic gas substantially equal to the volume in the volumetric offset is delivered when the first fixed flow valve is opened rapidly and (2) a sharp cutoff is provided when the first fixed flow valve is closed rapidly.
4 . The system of claim 1 , wherein when the first fixed flow orifice is downstream to the first fixed flow valve at least one of (1) a sharp turn on is provided when the first fixed flow valve is opened rapidly, and (2) a waning flow having a volume substantially equal to a volume in the volumetric offset is provided when the first fixed flow valve is closed rapidly.
5 . The system of claim 1 , wherein when the first fixed flow orifice is upstream from the first fixed flow valve, the volumetric offset is substantially minimized to decrease duration of a waning flow generated when the first fixed flow valve is closed rapidly.
6 . The system of claim 5 , wherein the volumetric offset has a volume of less than 1 mL.
7 . The system of claim 6 , wherein the volumetric offset has a volume in the range of 0.0005 mL to 0.1 mL.
8 . The system of claim 1 , further comprising a dampener for ringing.
9 . The system of claim 1 , wherein the desired flow profile for the pulse of pharmaceutical gas is one that minimizes the time that the first fixed flow valve is open.
10 . The system of claim 9 , wherein the first fixed flow valve provides a pulse having a pulse width of less than 500 milliseconds.
11 . A method of providing a pulse of a pharmaceutical gas with a desired flow profile to deliver to a patient, the method comprising:
rapidly opening a first fixed flow valve that is located upstream from a first fixed flow orifice to commence delivery of a first dose of a pharmaceutical gas in a pulse having a desired flow profile to a patient that abruptly increases flow to a desired initial flow rate over negligible time;
rapidly closing the first fixed flow valve to end flow, through the first fixed flow valve, of the pharmaceutical gas; and
providing a waning flow of the pharmaceutical gas after rapidly closing the first fixed flow valve to complete delivery, to the patient, of the pulse of the pharmaceutical gas with the desired flow profile, wherein the waning flow is generated in response to arranging the first fixed flow valve at a volumetric offset from the first fixed flow orifice such that the waning flow is at least one of reduced by lessening the volumetric offset or increased by increasing the volumetric offset.
12 . The method of claim 11 , wherein the pulse of a pharmaceutical gas having a desired flow profile is provided to a patient to treat at least one of chronic obstructive pulmonary disease (COPD), idiopathic pulmonary fibrosis (IPF), and pulmonary hypertension (PH).
13 . The method of claim 11 , wherein the desired flow profile is downwardly sloped triangular shaped.
14 . The method of claim 11 , further comprising:
maintaining open the first fixed flow valve to continue delivery, to the patient, of the pulse of the pharmaceutical gas with the desired flow profile at a desired continued flow rate for a period of time.
15 . The method of claim 14 , wherein the desired flow profile is quadrilateral shaped.
16 . The method of claim 15 , wherein the volumetric offset has a volume of less than 1 mL and the quadrilateral is substantially rectangular shaped.
17 . A method of providing a pulse of a pharmaceutical gas with a desired flow profile to deliver to a patient, the method comprising:
rapidly opening a first fixed flow valve that is located downstream from a first fixed flow orifice to commence delivery of a first dose of a pharmaceutical gas in a pulse having a desired flow profile to a patient that abruptly increases flow to a desired initial flow rate including an initial flow spike over negligible time, wherein the initial flow spike is generated in response to arranging the first fixed flow valve at a volumetric offset from the first fixed flow orifice such that the initial flow spike is at least one of reduced by lessening the volumetric offset or increased by increasing the volumetric offset; and
rapidly closing the first fixed flow valve to end flow, through the first fixed flow valve, of the pharmaceutical gas to complete delivery, to the patient, of the pulse of the pharmaceutical gas with the desired flow profile.
18 . The method of claim 17 , wherein the pulse of a pharmaceutical gas having a desired flow profile is provided to a patient to treat at least one of chronic obstructive pulmonary disease (COPD), idiopathic pulmonary fibrosis (IPF), and pulmonary hypertension (PH).
19 . The method of claim 17 , further comprising:
maintaining open the first fixed flow valve to continue delivery, to the patient, of the pulse of the pharmaceutical gas with the desired flow profile at a desired continued flow rate for a period of time.
20 . The method of claim 17 , wherein the desired flow profile is quadrilateral shaped.