SELF-CONTAINED NEGATIVE PRESSURE ENVIRONMENT DEVICE AND SYSTEM
20220001216 · 2022-01-06
Assignee
Inventors
- Michael Adams (Phoenix, AZ, US)
- Kristen Adams (Phoenix, AZ, US)
- Joseph V. Ranalletta (Greenville, SC, US)
- Gonghao Wang (Cary, NC, US)
Cpc classification
B01D46/10
PERFORMING OPERATIONS; TRANSPORTING
A61G10/023
HUMAN NECESSITIES
A61G13/108
HUMAN NECESSITIES
International classification
Abstract
A system configured to create a self-contained negative pressure environment (SCONE) to remove airborne particulates emitted from a patient. The system prevents exposure to pathogenic biological airborne particulates during triage, transportation, and treatment, including aerosol generating procedures (AGPs) and end of life care. This system is directed to a collapsible device having a flexible cover covering two support members, with openings in the flexible cover such that medical professionals can reach in and operate within. The present invention is further adaptable to patients and operating environments of various sizes.
Claims
1. A device for removing airborne particulates from an environment, comprising: a frame including a first curved portion and a second curved portion; a base including a first curved end and a second curved end; a flexible cover including at least one opening; and at least one port operable to connect to a vacuum; wherein the base and the frame are foldable; wherein the frame is a wire frame; wherein the flexible cover is configured to cover the frame and the base; wherein the flexible cover is attached to the frame and the base; wherein the device is configured to be positioned in an open position and a closed position; wherein, in the open position, the frame and the base are configured to stretch the flexible cover; wherein, in the open position, the flexible cover is in tension between the first curved end of the base and the second curved end of the base; wherein, in the open position, a bottom of the first curved portion of the frame is substantially parallel to a bottom of the second curved portion of the frame; wherein, in the open position, a center of the bottom of the first curved portion is positioned an equal distance from the first curved end of the base and the second curved end of the base, and wherein a center of the bottom of the second curved portion of the frame is positioned an equal distance from the first curved end of the base and the second curved end of the base; wherein, in the closed position, the frame is positioned between the first curved end of the base and the second curved end of the base; and wherein, in the open position, the device is operable to create a closed negative pressure environment when connected to the vacuum.
2. (canceled)
3. The device of claim 1, wherein the device is configured to move from the closed position into the open position when the first curved end of the base is twisted.
4. The device of claim 1, wherein the base is an oval shape.
5. The device of claim 1, wherein, in moving from the closed position to the open position, the base is configured to extend the flexible cover, wherein the flexible cover is configured to apply tension to the frame, wherein the frame is configured to extend due to the tension applied by the flexible cover.
6. The device of claim 1, further including at least one cover attachment component, wherein the at least one cover attachment component includes at least one female snap fastener, wherein the at least one female snap fastener is operable to receive a male snap fastener, wherein the flexible cover includes the male snap fastener.
7. (canceled)
8. The device of claim 1, further including at least one High Efficiency Particulate Air (HEPA) filter connected to the at least one port.
9. The device of claim 1, wherein the at least one opening includes four openings.
10. A device for removing airborne particulates from an environment, comprising: a frame and a base; a flexible cover including at least one opening; and at least one port operable to connect to a vacuum; wherein the frame is foldable; wherein the device is configured to be positioned in an open position and a closed position; wherein, in the open position, a first curved portion of the frame is substantially parallel to a second curved portion of the frame; wherein, in the open position, a center of a bottom of a first curved portion of the frame is substantially parallel to a center of a bottom of a second curved portion of the frame; wherein the base includes a first curved end and a second curved end; wherein the flexible cover is configured to cover the frame and the base; wherein the flexible cover is attached to the base and the frame; wherein, in the open position, the frame and the base are configured to stretch the flexible cover; wherein, in the open position, a top of the first curved portion and a top of the second curved portion are of substantially equal height, and a plane intersecting the top of the first curved portion and the top of the second curved portion is parallel to the base; wherein, in the open position, a first distance between the center of the bottom of the first curved portion of the frame and the first curved end of the base is equal to a second distance between the center of the bottom of the second curved portion of the frame and the second curved end of the base; and wherein the device is operable to create a closed negative pressure environment when connected to the vacuum.
11. (canceled)
12. The device of claim 10, wherein the device is configured to move from the closed position into the open position when the first curved end of the base is twisted.
13. The device of claim 10, further including at least one cover attachment component, wherein the at least one cover attachment component includes at least one female snap fastener, wherein the at least one female snap fastener is operable to receive a male snap fastener, wherein the flexible cover includes the male snap fastener.
14. The device of claim 10, further including at least one High Efficiency Particulate Air (HEPA) filter connected to the at least one port.
15. The device of claim 10, wherein in moving from the closed position to the open position, the base is configured to extend the flexible cover, wherein the flexible cover is configured to apply tension to the frame, wherein the frame is configured to extend due to the tension applied by the flexible cover.
16. The device of claim 10, wherein the flexible cover is permanently affixed to the frame and the base, wherein the frame and the base are configured to simultaneously expand from the closed position to the open position, wherein the frame and the base are configured to extend the flexible cover when moving from the closed position to the open position.
17. The device of claim 10, wherein the flexible cover comprises polyvinyl chloride.
18. A device for removing airborne particulates from an environment, comprising: a base; a wire frame; at least one attachment mechanism; a flexible cover including at least one opening; at least one port operable to connect to a vacuum; and at least one tube including a first end and a second end; wherein the base is an oval shape; wherein the base includes a first curved end and a second curved end; wherein the frame includes a first curved portion, a second curved portion, a third curved portion, and a fourth curved portion; wherein the device is configured to be positioned in an open position and a closed position; wherein, in the open position, a first distance between the first curved portion of the frame and the first curved end of the base is equal to a second distance between the third curved portion of the frame and the second curved end of the base; wherein, in the open position, the first curved portion of the frame is substantially parallel to the third curved portion of the frame; wherein in the open position, the second curved portion is substantially parallel to the fourth curved portion of the frame; wherein, in the open position, a top of the first curved portion and a top of the third curved portion are of substantially equal height, and a plane intersecting the top of the first curved portion and the top of the third curved portion is parallel to the base; wherein the first end of the at least one tube is connected to the at least one port; wherein the second end of the at least one tube is connected to the vacuum; and wherein the device is operable to create a negative pressure environment when connected to the vacuum.
19. The device of claim 18, further including at least one cover attachment component, wherein the at least one cover attachment component includes at least one female snap fastener, wherein the at least one female snap fastener is operable to receive a male snap fastener, wherein the flexible cover includes the male snap fastener.
20. The device of claim 18, wherein the device is configured for simultaneous movement of the frame and the base when moving from the closed position to the open position.
21. The device of claim 1, wherein, in the open position, a first distance between a center of the first curved portion and a center of the first curved end of the base is equal to a second distance between a center of the second curved portion and the second curved end of the base.
22. The device of claim 1, wherein, in the open position, a top of the first curved portion and a top of the second curved portion are of substantially equal height, and a plane intersecting the top of the first curved portion and the top of the second curved portion is parallel to the base.
23. The device of claim 18, wherein, in the open position, a center of a bottom of the second curved portion is positioned an equal distance from the first curved end of the base and the second curved end of the base, and wherein a center of a bottom of the fourth curved portion of the frame is positioned an equal distance from the first curved end of the base and the second curved end of the base.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
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DETAILED DESCRIPTION
[0080] The present invention is generally directed to preventing exposure to pathogenic biological airborne particulates.
[0081] In one embodiment, the present invention includes a device for removing airborne particulates from an environment, comprising: a multiplicity of support members, at least two locking hinges, a flexible cover including at least one slit, at least one port operable to connect to an air supply or a vacuum, and at least one crossbar, wherein at least two support members of the multiplicity of support members are substantially parallel, wherein each of the at least two locking hinges is configured to connect at least two of the multiplicity of support members, wherein the at least one crossbar is configured to connect the at least two substantially parallel support members, wherein the flexible cover covers the multiplicity of support members, and wherein the at least one slit provides access to the interior of the device. The device further includes wherein the multiplicity of support members include a brace, wherein the brace includes a first brace crossbar, a second brace crossbar, a first pair of substantially parallel support members and a second pair of substantially parallel support members, wherein the first brace crossbar is configured to connect each support member of the first set of substantially parallel support members, and wherein the second brace crossbar is configured to connect each support member of the second set of substantially parallel support members. The brace further includes the at least two locking hinges, wherein each of the at least two locking hinges is configured to connect to a support member of the first set of substantially parallel support members and a support member of the second set of substantially parallel support members. The device further including a base, wherein the base includes a first base support member, a second base support member, and a base crossbar, wherein the first base support member and the second base support member are substantially parallel, and wherein the base crossbar is configured to connect the first base support member and the second base support member. The device is configured to be positioned in an open position and a closed position, wherein, in the open position, at least two of the multiplicity of support members are substantially orthogonal, wherein the at least two substantially orthogonal support members are connected via at least one barb fitting. The flexible cover includes polyvinyl carbonate. The at least one slit includes four slits. The device further includes a base and at least one attachment component, wherein the base includes a base crossbar, wherein the at least one attachment component is connected to the base crossbar, wherein the at least one attachment component is operable to attach the device to a hospital bed or a stretcher. The at least one port includes two ports. The device further includes at least one cover attachment component, wherein the at least one cover attachment component includes at least one female snap fastener, wherein the at least one female snap fastener is operable to receive a male snap fastener, and wherein the flexible cover includes the male snap fastener.
[0082] In another embodiment, the present invention includes a device for removing airborne particulates from an environment, comprising: a multiplicity of support members, at least two locking hinges, a flexible cover including at least one slit, at least one port operable to connect to an air supply or a vacuum, at least one crossbar, and at least one tube including a first end and a second end, wherein each of the at least two locking hinges is configured to connect at least two support members of the multiplicity of support members, wherein at least two support members of the multiplicity of support members are substantially parallel, wherein the at least one crossbar is configured to connect the at least two substantially parallel support members, wherein the flexible cover covers the multiplicity of support members, wherein the slit provides access to the interior of the device, wherein the first end of the at least one tube is connected to the at least one port, and wherein the second end of the at least one tube is connected to the air supply or the vacuum. The device further includes wherein the multiplicity of support members include a brace, wherein the brace includes a first brace crossbar, a second brace crossbar, a first pair of substantially parallel support members and a second pair of substantially parallel support members, wherein the first brace crossbar is configured to connect each support member of the first set of substantially parallel support members, wherein the second brace crossbar is configured to connect each support member of the second set of substantially parallel support members. The brace further includes the at least two locking hinges, wherein each of the at least two locking hinges is configured to connect to a support member of the first set of substantially parallel support members and a support member of the second set of substantially parallel support members. The device further including a base, wherein the base includes a first base support member, a second base support member, and a base crossbar, wherein the first base support member and the second base support member are substantially parallel, wherein the base crossbar is configured to connect the first base support member and the second base support member. The device is further configured to be positioned in an open position and a closed position, wherein, in the open position, at least two of the multiplicity of support members are substantially orthogonal, wherein the at least two substantially orthogonal support members are connected via at least one barb fitting. The device further including at least one High Efficiency Particulate Air (HEPA) filter connected to the at least one port. The device wherein the at least one slit includes four slits. The device wherein the flexible cover includes polyvinyl carbonate. The device further including a base and at least one attachment component, wherein the base includes a base crossbar, wherein the at least one attachment component is attached to the base crossbar, and wherein the at least one attachment component is operable to attach the device to a hospital bed or a stretcher. The device wherein the at least one port includes two ports. The device further including at least one cover attachment component, wherein the at least one cover attachment component includes at least one female snap fastener, wherein the at least one female snap fastener is operable to receive a male snap fastener, wherein the flexible cover includes the male snap fastener.
[0083] In yet another embodiment, the present invention includes a device for removing airborne particulates from an environment, comprising: a multiplicity of support members, at least two locking hinges, a flexible cover including at least one slit, at least one port operable to connect to an air supply or a vacuum, at least one crossbar, and at least one barb fitting, wherein at least two support members of the multiplicity of support members are substantially parallel, wherein each of the at least two locking hinges is configured to connect at least two of the multiplicity of support members, wherein the at least one crossbar is configured to connect the at least two substantially parallel support members, wherein the at least one barb fitting is configured to connect at least two support members of the multiplicity of support members, wherein the flexible cover covers the multiplicity of support members; wherein the at least one slit provides access to the interior of the device, wherein the device is configured to be positioned in an open position and a closed position, and wherein, in the open position, at least two of the multiplicity of support members are substantially orthogonal. The device further including a base and at least one attachment component, wherein the base includes a base crossbar, wherein the at least one attachment component is attached to the base crossbar, and wherein the at least one attachment component is operable to attach the device to a hospital bed or a stretcher. The device further including at least one cover attachment component, wherein the at least one cover attachment component includes at least one female snap fastener, wherein the at least one female snap fastener is operable to receive a male snap fastener, wherein the flexible cover includes the male snap fastener. The device wherein the at least two substantially orthogonal support members are connected via the at least one barb fitting.
[0084] In still another embodiment, the present invention includes a device for removing airborne particulates from an environment, comprising: a multiplicity of support members, at least two locking hinges, a flexible cover including at least one slit, at least one port operable to connect to an air supply or a vacuum, at least one crossbar, at least one barb fitting, a base, and an attachment component, wherein at least two support members of the multiplicity of support members are substantially parallel, wherein each of the at least two locking hinges are configured to connect at least two of the multiplicity of support members, wherein the at least one crossbar is configured to connect the at least two substantially parallel support members, wherein the at least one barb fitting is configured to connect at least two support members of the multiplicity of support members, wherein the flexible cover covers the multiplicity of support members, wherein the at least one slit provides access to the interior of the device, wherein the base includes a first base support member, a second base support member, and a base crossbar, wherein the first base support member and the second base support member are substantially parallel, and wherein the base crossbar is configured to connect the first base support member and the second base support member, and wherein the attachment component is operable to attach the device to a hospital bed or a stretcher. The device wherein the multiplicity of support members include a brace, wherein the brace includes a first brace crossbar, a second brace crossbar, a first pair of substantially parallel support members and a second pair of substantially parallel support members, wherein the first brace crossbar is configured to connect each member of the first set of substantially parallel support members, and wherein the second brace crossbar is configured to connect each support member of the second set of substantially parallel support members. The device wherein the at least one slit includes four slits. The device further including at least one cover attachment component, wherein the at least one cover attachment component includes at least one female snap fastener, wherein the at least one female snap fastener is operable to receive a male snap fastener, wherein the flexible cover includes a male snap fastener. The device is configured to be positioned in an open position and a closed position, wherein, in the open position, at least two of the multiplicity of support members are substantially orthogonal, wherein the at least two substantially orthogonal support members are connected via the at least one barb fitting.
[0085] None of the prior art discloses an adjustable negative pressure environment system that reduces the difficulty of operating on a patient without increasing the exposure to pathogenic airborne particles.
[0086] The present invention is directed towards a self-contained negative pressure environment (SCONE) device. In one embodiment, the SCONE device includes a standalone clear polycarbonate box with arm access holes, a drape holder, at least one arm hole cover and tubing connector/adapter(s). The intubation device is operable to mount on a bed to cover a patient's neck and head when the patient is lying in a supine position. The SCONE device includes an air supply and a vacuum suction tube to generate a negative pressure environment for the patient. Advantageously, the SCONE device acts as an extra layer of protection in addition to personal protective equipment (PPE) to prevent healthcare personnel (HCP) exposure to pathogenic biological airborne particulates during triage, transportation, and treatment, including aerosol generating procedures (AGPs) and end of life care. For example and not limitation, the present invention is operable to block COVID-19 particulates and similarly sized particulates. The present invention is further operable to capture and remove airborne particulates from a patient's nose and mouth by creating a negative pressure environment that provides both barrier and aerosolization protection.
[0087] It is an object of the present invention to reduce the spread of infectious disease in hospitals, decrease illness and missed workdays for healthcare professionals and reduce the need for costly personal protective equipment. Additionally, the present invention enables a hospital to increase its triage throughput, particular during periods of high capacity (e.g., during a pandemic). The present invention increases triage throughput by providing an adaptable device for patients and hospital beds of different sizes. Furthermore, the present invention prevents exposure to airborne pathogenic particulates for hospital visitors, and increases a patient's morale and emotional comfort.
[0088] The present invention is further directed towards ambulatory uses. In one embodiment, the present invention is configured for quick deployment during emergency situations.
[0089] In one embodiment, the present invention includes a device that is operable to support a variety of medical procedures. The device includes a box, at least one drape, a drape holder strip, a tether for the drape holder strip, magnetic tape for the drape holder strip, at least one magnet, at least one cap plug, at least one safety line, at least one pipe adapter, at least one breathing circuit, at least one step-down adapter, tubing, and at least one tube connector. In another embodiment, the box includes a clear polycarbonate material. In one embodiment, the box is 5-sided. The box includes at least one arm access hole to provide access to a patient. The box further includes at least one air management port to provide for the inflow and outflow of air. The at least one cap plug is operable to support a ⅛ inch plastic safety line. The present invention further includes at least one cap plug for a hand hole cover and at least one cap plug for a suction line. In another embodiment, the present invention includes ½ inch socket-connect female×½ inch NPT male PVC pipe adapter and an ½ inch socket-connect female×½ inch NPT female PVC pipe adapter. The present invention further includes a Universal F2 anesthesia breathing circuit. In yet another embodiment, the present invention includes a polyvinyl chloride (PVC) film cover.
[0090] In one embodiment, the present invention includes a step down adapter between a breathing tube and a hospital line. In another embodiment, the outer ring of the step-down adapter is 1 and ⅜ inches. The hole opening has a larger end diameter of ⅞ inches. In another embodiment the step-down adapter includes a hole opening diameter of 13/16 inches with an external diameter of 1⅜ inches. In yet another embodiment, the step-down adapter includes a soft plumbing hose rubber material.
[0091] In another embodiment, the present invention includes a drape. The present invention includes at least one drape holder strip, a tether for the drape holder strip, magnetic tape for the drape holder strip, and at least one magnet. In one embodiment, the magnet is a neodymium magnet.
[0092] Referring now to the drawings in general, the illustrations are for the purpose of describing one or more preferred embodiments of the invention and are not intended to limit the invention thereto.
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[0107] In some embodiments, the SCONE device 100 may have open and closed positions. In an open position, the legs 305a of the two support members 305 of the SCONE device are substantially orthogonal, as shown in
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TABLE-US-00001 TABLE 1 Parts and Materials for One Embodiment of a SCONE device Descririon Quantity Materials Certs 6 mm Clear 1 PVC N/A Vinyl Cover Frame body 4 Aluminum N/A (0.375″ OD) 6061 Frame bracket 2 Nickle plated N/A stainless Frame hinge 6 Polypropylene N/A Frame C-clamp 20 PVC N/A 90-degree barb fitting 2 Polypropylene N/A (1/4 NPT × 3/8″) 90-degree barb fitting 1 Polypropylene N/A (1/4 NPT × 1/4″) Washer 6 Rubber N/A Locknut (1/4 NPT) 3 Nylon N/A Cap (for 3/8″ OD) 3 Elastomer Medical Grade Double-sided tape N/A Acrylic Non-Medical for arm holes Grade
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EXAMPLE 1
Clearance Efficacy Test—No Open Holes
[0116] A SCONE device was tested using a human mannequin torso with a simulated aerosol generating device (AGD) producing particles within the device with sizes ranging from 0.3 to 10 μm. The AGD was capable of producing simulated cough events, increasing the average particle density within the counter from between 1,200-1,500 particles per liter to 30,000-45,000 particles per liter. The number of particles within the device over time were counted using a Fluke Particle Counter. After a simulated cough event, particle density within the device was counted immediately after the cough event and at one-minute intervals afterward until ambient baseline levels were reached.
[0117] The test demonstrated a pressure within the device of −0.002-0.0004 inches water. Immediately after the simulated cough event, particle count directly adjacent to, but outside of the box were measured to be at ambient levels and remained at those levels for the full duration of the study. The clearance efficiency within the device was measured to be 99% in less than three minutes, with a complete return to baseline levels within 7 minutes.
[0118] Similar tests were performed in which oxygen was regularly supplied to the interior of a SCONE device.
EXAMPLE 2
Clearance Efficacy Test—Open Holes
[0119] SCONE devices having one or more holes open to the outside environment were also tested, in order to simulate the efficacy of the device during interaction by medical professionals. The efficacy of the device with varying numbers of open holes was tested against a negative control group, wherein no SCONE device was present. The background-subtracted equilibrium particle count and percent decrease in number of particles relative to the negative control are shown in Table 2 below.
TABLE-US-00002 TABLE 2 Efficacy of SCONE devices having various numbers of open or semi-open holes Total Vacuum Background- Percent- Flow Subtracted Decrease vs. Rate Equilibrium Negative Condition [SLPM] Particle Count Control No SCONE in place 0 76,563 particles/cm.sup.3 0% (negative control) SCONE with 2 holes 60 12,647 particles/cm.sup.3 83% open and simulated “arms” in these holes. SCONE with 2 holes 60 19,907 particles/cm.sup.3 74% fully open. SCONE with 3 holes 60 33,446 particles/cm.sup.3 56% fully open. SCONE with no 60 50 particles/cm.sup.3 ~100% holes open; fully sealed.
EXAMPLE 3
Safety Tests
[0120] In order to test the safety of a SCONE device, a volunteer was placed inside the SCONE device for 12 minutes. During the course of the test, the volunteer's oxygen saturation, end-tidal CO.sub.2 levels, and inspired minimum CO.sub.2 levels were continuously monitored. Normal levels of oxygen saturation were considered to be between 95 and 100%, with results below 90% being considered low. Normal ranges for End-Tidal CO.sub.2 were expected to be between 35 and 35 mmHg, while a normal range for inspired minimum CO.sub.2 was considered to be 2-20 mmHg. Results of this test, with vital levels being reported every minute for 12 minutes is recorded below in Table 3.
TABLE-US-00003 TABLE 3 Oxygen Saturation and CO.sub.2 levels of volunteer within SCONE device Time SaO.sub.2 End Tidal IMCO.sub.2/ (minutes) % CO.sub.2/mmHg mmHg 0 100 35 4 1 100 34 4 2 100 34 3 3 99 34 3 4 98 34 4 5 98 34 4 6 99 34 4 7 99 34 4 8 99 34 4 9 99 34 4 10 99 34 4 11 99 34 4 12 99 34 4
[0121] In one embodiment, the present invention is foldable and/or collapsible, thereby increasing the portability sand saving storage space. The SCONE device is adjustable to accommodate for various bed sizes and patient widths. Additionally, the adjustability of the SCONE device allows for a health care professional to adapt the SCONE device to a patient's comfort level. For example, and not limitation, if a patient is claustrophobic, then the SCONE device is operable to increase in width and height to relieve the patient's discomfort. Alternatively, the SCONE device is angled to increase the space around a patient's head and eyes. In one embodiment, the present invention is operable to increase between 10% to 20% in width. In another embodiment, the present invention is operable to increase between 15 to 25% in size. In yet another embodiment, the present invention is operable to increase between 5% to 15% in size.
[0122] The SCONE device includes holes in the bottom of the device to allow for affixation to a bed and to support a patient sitting at different angles. In one embodiment, the SCONE device includes at least one hand access port to allow for access to a patient. In another embodiment, the present invention includes four hand access ports. In one embodiment, the SCONE device is disposable. The SCONE device includes a PVC or ethylene vinyl acetate (EVA) film that is used during triage, transportation, and treatment, including aerosol generating procedures (AGPs). In yet another embodiment the present invention is reusable.
[0123] The present invention maintains an airtight connection when subjected to a pressure range from between about −8 psi to about atmospheric pressure. The SCONE device is operable to maintain a negative pressure between about −6 to about −3.5 psi. Advantageously, the present invention is operable to function after exposure to 80% isopropyl alcohol and ethanol-based cleaners. Additionally, the present invention is operable to support aerosolized treatments (BIPAP/CPAP and nebulizers).
[0124] The present invention is configured to work with a vacuum, medical/oxygen, HEPA filters. However, a HEPA filter is not required for the present invention, which increases the air flow rate. In yet another embodiment, the present invention includes at least two vacuum suction lines that are operable to create a negative-pressure environment and increase the particulate clearance rate. In another embodiment, the present invention is configured to improve visibility for the patient while in the device. For example, and not limitation, the SCONE device includes a clear polycarbonate material that allows for a patient to see out of the SCONE device and for healthcare personnel to see inside the SCONE device.
[0125] In another embodiment, the present invention includes at least one sensor. In one embodiment, the at least one sensor includes an air flow rate sensor, a pressure gage, a molecular sensor, a temperature sensor, and/or a moisture sensor. The air flow rate sensor is operable to measure the air exchange rate of the SCONE device. For example, and not limitation, the air flow rate sensor measures the air exchange rate of the SCONE device based on the change in volume and/or density in air going through the SCONE device. The air flow sensor includes a temperature sensor and a heating element. The air flow sensor is operable to determine a temperature difference from the airflow around the heating element and is configured for bidirectional measurement. The change in temperature corresponds to a change in air particulates and the sensor is operable to generate a measurement signal in response to the change in temperature. In yet another embodiment, the present invention is configured to provide a tracer gas. The at least one sensor is operable to monitor the mass air flow rate of the tracer gas to determine the volume of air inside the SCONE device and evaluate if the SCONE device if functioning properly.
[0126] The above-mentioned examples are provided to serve the purpose of clarifying the aspects of the invention, and it will be apparent to one skilled in the art that they do not serve to limit the scope of the invention. By nature, this invention is highly adjustable, customizable and adaptable. The above-mentioned examples are just some of the many configurations that the mentioned components can take on. All modifications and improvements have been deleted herein for the sake of conciseness and readability but are properly within the scope of the present invention.