The present embodiments are directed to capnography oxygen facemask.
Oxygen facemasks, such as non-rebreather (NRB) facemasks and regular oxygen facemasks (RFM), are used in medical emergencies where people in distress require oxygen therapy. Such emergencies include physical trauma, chronic airway limitations, chronic obstructive pulmonary diseases, smoke inhalation, carbon monoxide poisoning and other respiratory impairments.
A typical oxygen facemask covers both the nose and the mouth of a patient. It is constrained to their face by way of an elastic strap that goes around the back of the patient’s head. The elastic strap is essentially attached to the perimeter of the typical facemask (within a quarter/half an inch from the perimeter). It is to innovations related to this subject matter that the embodiments of the invention is generally directed.
The present embodiments are directed to capnography facemasks with some embodiments directed to filtrating exhalant that could be contaminated with airborne biological pathogens from a patient wearing/using a capnography facemask. Hence, several different capnography facemask embodiments are presented herein including an oxygen facemask that has pathogen filtering capability, which can be used in conjunction with a capnometer to measure carbon dioxide levels in a patient’s breath. Because, a patient’s blood carbon dioxide (CO2) level can be the difference between a good and a bad outcome, there is value in measuring a patient’s breath CO2 level. Some of the embodiments herein are directed to measuring CO2 levels of a patient’s breath after exiting a facemask with a capnometer. The CO2 levels in the patient’s breath correlate with blood CO2 levels. To address exhaling airborne transmissible viruses, an exhalent filtration system is disclosed which is included in the facemask. The exhalent filtration system filters the patient’s breath, which protects those helping the patient. The exhalent filtration system incorporates both filtering air exiting 1) the facemask and 2) the capnometer.
With this in mind, certain embodiments of the present invention therefore contemplate a capnography facemask generally comprising a facemask cup that is connected to a capnometer by way of an exhaled air filter. The facemask cup possesses an outer rim defined by a nose bridge rim region configured to traverse a wearer’s nose bridge, two cheek rim regions configured to traverse a wearer’s cheeks, and a chin rim region configured to traverse a wearer’s face below their mouth, such as along their jawline, for example. The face covering cup defines a nose region that is configured to cover the wearer’s nose and a mouth region configured to cover the wearer’s mouth. A facemask oxygen inlet tube outwardly extends from the facemask cup in the nose region. The capnography the facemask is connected to an exhaled air filter located at the mouth region, the exhaled air filter comprising at least one primary exit aperture and a sample exit port. The capnography the facemask is configured to be worn on a wearer’s face when being used, there is nothing between the at least one primary exit aperture and an exterior environment when the capnography the facemask is being used. There is a capnometer between the sample exit port in the exterior environment when the capnography the facemask is being used.
Yet another embodiment of the present invention contemplates a capnography facemask assembly comprising a the facemask including: 1) a face covering cup defining a cup exterior and a cup interior, the face covering cup terminates at a cup rim, 2) the facemask further comprising a facemask oxygen inlet tube located at a cup nose region and extending outwardly from the cup exterior, and 3) an exhale port located at a cup mouth region, the facemask configured to cover a mouth and nostrils of a person, which essentially seals against a face of a person at an interface between the face and the cup rim. The cup interior faces the person’s face and the cup exterior faces an exterior environment when worn on the person’s face. A capnometer comprises a capnometer intake port and a capnometer exit port. An exhaled air filter is disposed between the capnometer and the exhale port. The exhaled air filter comprises filter media, at least one primary exit aperture, and a sample exit port. The exterior environment is in communication with the cup interior via the at least one primary exit aperture and via the capnometer exit port.
Still, another embodiment envisions a method for using a capnography facemask assembly, the method comprising providing a facemask that includes a face covering cup, a capnometer, and an exhaled air filter. The face covering cup terminates at a cup rim, which defines a cup exterior and a cup interior. The capnometer has a capnometer intake port and capnometer exit port. An exhaled air filter is interposed between the capnometer and an exhale port located at a cup mouth region of the face covering cup. The method continues with covering a mouth, nostrils and a portion of a person’s face with the facemask with the cup interior facing the person’s face. The cup rim essentially seals against the person’s face. Volume between the cup interior and the person’s face defines an interior environment. The capnometer intake port is attached to a filter sample port of the exhaled air filter via a sample exhaled air tube. Essentially all air that exits from the interior environment is filtered to an exterior environment via the exhaled air filter (filtered air). All of the filtered air exits into the exterior environment via A) the capnometer exit port and B) at least one primary exit aperture of the exhaled air filter.
Initially, this disclosure is by way of example only, not by limitation. Thus, although the instrumentalities described herein are for the convenience of explanation, shown and described with respect to exemplary embodiments, it will be appreciated that the principles herein may be applied equally in other similar configurations involving the subject matter directed to the field of the invention. The phrases “in one embodiment”, “according to one embodiment”, and the like, generally mean the particular feature, structure, or characteristic following the phrase, is included in at least one embodiment of the present invention and may be included in more than one embodiment of the present invention. Importantly, such phases do not necessarily refer to the same embodiment. If the specification states a component or feature “may”, “can”, “could”, or “might” be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic. As used herein, the terms “having”, “have”, “including” and “include” are considered open language and are synonymous with the term “comprising”. Furthermore, as used herein, the term “essentially” is meant to stress that a characteristic of something is to be interpreted within acceptable tolerance margins known to those skilled in the art in keeping with typical normal world tolerance, which is analogous with “more or less.” For example, essentially flat, essentially straight, essentially on time, etc. all indicate that these characteristics are not capable of being perfect within the sense of their limits. Accordingly, if there is no specific +/- value assigned to “essentially”, then assume essentially means to be within +/- 2.5% of exact. The term “connected to” as used herein is to be interpreted as a first element physically linked or attached to a second element and not as a “means for attaching” as in a “means plus function”. In fact, unless a term expressly uses “means for” followed by the gerund form of a verb, that term shall not be interpreted under 35 U.S.C. § 112(f). In what follows, similar or identical structures may be identified using identical callouts.
With respect to the drawings, it is noted that the figures are not necessarily drawn to scale and are diagrammatic in nature to illustrate features of interest. Descriptive terminology such as, for example, upper/lower, top/bottom, horizontal/vertical, left/right and the like, may be adopted with respect to the various views or conventions provided in the figures as generally understood by an onlooker for purposes of enhancing the reader’s understanding and is in no way intended to be limiting. All embodiments described herein are submitted to be operational irrespective of any overall physical orientation unless specifically described otherwise, such as elements that rely on gravity to operate, for example.
The present embodiments are directed to capnography oxygen facemasks with some embodiments directed to filtrating exhalant. Capnography is a non-invasive measurement of the partial pressure of CO2 from a person’s airway during inspiration and expiration. It provides physiologic information on ventilation, perfusion, and metabolism, which is important for airway management. Capnography measurements are obtained with a capnometer, which is a monitoring device that measures and numerically displays the concentration of CO2 in exhalent (exhaled air/gas). Capnography works by measuring the amount of infrared light that is absorbed by CO2. Exhaled air passes down a tube (that is connected to a capnometer), through the capnometer and into ambient air. Because capnometers are used in emergency rooms, hospital rooms, or other general healthcare rooms, the exhaled air ultimately passes from the capnometer into these rooms. As exhaled gas passes through the capnometer, a beam of infrared light shines on an infrared sensor by way of passing through the exhaled air.. The amount of infrared light that reaches the infrared sensor corresponds to the amount of CO2 in the patient’s exhaled gas.
Though capnometers can comprise general internal filtration capability (typically within the capnometer housing) or at the capnometer, such general filtration capability is for dust greater than 5 microns. In other words, a capnometer’s general internal filtration capability is to protect the instrumentation from getting damaged by dust particles. Hence, filtering out viruses or bacteria provides no benefit to the functionality of a capnometer and therefore has never been integrated in a capnometer. Certain aspects of the present invention are directed to a filter system disposed at a facemask or in a tube connecting a facemask to a capnometer. Certain embodiments envision this filter being disposed in a location between the facemask in the capnometer instead of being at or in a capnometer, thereby making it much easier to access and change or otherwise replace the filter with a new one. Certain other embodiments envision including a biological filter system at the capnometer that filters biological particles, such as bacteria and/or viruses. Certain other aspects of the present invention are directed to filtering viruses from exhalant thereby reducing exposure of a potentially dangerous virus to those working with the patient in the same room. The exhalent filtration system incorporates both filtering air exiting the facemask directly into a common space and indirectly into the common space by way of the capnometer. Additionally, by filtering the exhaled breath before it reaches the capnometer, the capnometer will not get contaminated by a patient infected with a virus or bacterial infection that spreads through breathing.
In the present embodiment, the oxygen inlet tube 140 is held in place in the interior of the facemask oxygen inlet tube 208 by way of a friction fit. Other ways of connecting the oxygen inlet tube 140 to the facemask oxygen inlet tube 208 are well known in the mechanical arts. The exhaled air filter 150 is sized to completely cover the exhale port 204, as shown, and as will be discussed in further detail in conjunction with
With the present description in mind, below are some examples of certain embodiments illustratively complementing some of the methods and apparatus embodiments to aid the reader. The elements called out below in view of the various figures are examples provided to assist in understanding the present invention and accordingly should not be considered limiting.
In that light, one embodiment of the present invention described in view of
Embodiments of the capnography facemask 110 are additionally envisioned to include the facemask oxygen inlet tube 208 linking to an oxygen source 144 by way of an oxygen inlet tube 140, as shown in
The capnography facemask embodiment 110 is further envisioned to be wherein the outer rim 212 is configured to essentially seal against the wearer’s face when the capnography facemask 110 is being used. “Essentially seal” is meant to be within the standards of today’s Facemasks. It is envisioned that the capnography facemask 110 is pulled securely against the wearer’s face to pretty much seal against the wearer’s face, however in reality there may be small ‘unavoidable’ gaps between the outer rim 212 and the wearer’s face. The capnography facemask 110 is considered “essentially sealed” against a person’s face even with these small ‘unavoidable’ gaps.
The capnography facemask embodiment 110 further contemplates that when the capnography facemask 110 is being used essentially all air exiting the capnography facemask 110 is filtered air 154 before entering the exterior environment 170. In more plain language, when a person is wearing the capnography facemask 110 oxygen provided by the oxygen source 144 is directed towards the wearer’s nostrils but when the person exhales, essentially all of the exhaled breath is filtered by the exhaled air filter 150 (or more specifically the filter media 155) as it moves into the exterior environment 170. In this way, people in the vicinity of the person wearing the capnography facemask 110 are protected from any viruses actively shedding from the person. This can further include wherein a first portion of the filtered air 154 exits into the exterior environment 170 via the at least one primary exit aperture 159 and a second portion of the filtered air 154 exits into the exterior environment 170 via a capnometer exit port 166 of a capnometer 160. The capnometer 160 connected to the sample exit port 157 via a simple exhaled air tube 152. Accordingly, the majority of the exhaled breath ( > 51% filtered breath 154) goes through the exit slots 159 directly into the exterior environment 170 but a minority of the exhaled filtered breath 154 ( < 49%) is first sampled by the capnometer 160 for CO2 levels of the person wearing the capnography facemask 110 before it goes into the same exterior environment 170.
Certain embodiments contemplate the breathed out air 154 only going through the capnometer 160. In other words, the sample port 157 is envisioned to be sufficiently large enough to accommodate all of the exhaled air 154. Accordingly, in this embodiment, there is a biological filter system interposed between this facemask embodiment and the capnometer 160. Certain embodiments contemplate a filter system being placed by way of an intermediate tube between an oxygen facemask and the capnometer 160. Because the capnometer 160 provides the only exit port to the exterior environment 170 for the facemask arrangement (like arrangement 100, which includes all of the general elements albeit adjusted to suit the present embodiment), the only exit port in the facemask embodiment is to the capnometer 160.
The capnography facemask embodiment 110 further imagines the at least one primary exit aperture 159 being a slotted aperture. Of course, a person skilled in the art in possession of the technology disclosed herein will appreciate that the at least one primary exit aperture 159 can be about any shape and size that comports with the desired exit filtered air flow.
The capnography facemask embodiment 110 further contemplates comprising a front facemask retention brace 120 that defines a retention brace center 128 located between the nose region 242 and the mouth region 244. The front facemask retention brace 120 extends to retention brace distal ends 126 on either side of the retention brace center 128 toward the cheek rim regions 216, see
Yet another embodiment of the present invention explores a capnography facemask assembly 100 comprising that generally comprises a facemask 110 including: 1) a face covering cup 201 defining a cup exterior 205 and a cup interior 203, the face covering cup 201 terminates at a cup rim 212, 2) the facemask 110 further comprising a facemask oxygen inlet tube 208 located at a cup nose region 242 and extending outwardly from the cup exterior 205, and 3) an exhale port 204 located at a cup mouth region 244. The different major components (numerals 1-3) are not considered to be limiting of the major components unless otherwise stated but rather to help distinguish the elaborating language to each of the different major components. The facemask 110 is configured to cover a mouth and nostrils of a person and essentially seal against a face of a person at an interface between the face and the cup rim 212. The cup interior 203 facing the face and the cup exterior 205 facing an exterior environment 270 when worn on the face. A capnometer 160 comprising a capnometer intake port 165 and a capnometer exit port 166. An exhaled air filter 150 is disposed between the capnometer 160 and the exhale port 204. The exhaled air filter 150 comprising at least a filter media 155 (such as an N-95 or N-99 filter fabric), at least one primary exit aperture 159, and a sample exit port 157. The exterior environment 170 is in communication with the cup interior 203 via the at least one primary exit aperture 159 and via the capnometer exit port 166. Meaning, the exhaled air filter 150, which filters essentially all of the wearer’s breath as it exits the facemask 110 must either pass into the exterior environment 170 by way of the exit slots 159 or the capnometer 160. In this way, all breath exhaled from the wearer’s filtered whether it sampled through the capnometer or simply directly breathed out of the facemask 110 via the exit slots 159.
The capnography facemask assembly embodiment 100 as described above can further comprise an oxygen source 160 connected to the facemask oxygen inlet tube 208, the exterior environment 170 is only in communication with the cup interior 203 via the at least one primary exit aperture 159 and via the capnometer exit port 166.
The capnography facemask assembly embodiment 100 as described above can be wherein the exhaled air filter 150 is connected to the facemask 110 and covers the exhale port 204. Certain embodiments envision the exhaled air filter 150 not contacting the face covering cup 201 whatsoever but nonetheless covers the exhale port 204 by way of an intermediate member (such as a gasket, not shown). Because certain embodiments contemplate the exhaled air filter 150 being its own component, the exhaled air filter 150 can be removed from cooperating with a facemask 110, discarded and replaced with a new/unused exhaled air filter 150. Swapping out a used exhaled air filter 150 with a new exhaled air filter 150 can further protect those working with the wearer/patient in the same or otherwise common exterior environment 170. This provides an added protective benefit to situations when a patient needs to where the facemask 110 for periods of time that exceeds the recommended effective usage lifespan of the filter media 155.
The capnography facemask assembly embodiment 100 as described above can further comprise a front facemask retention brace 120 that is connected to the facemask 110 via a retention brace center connecting aperture 122 that encircles the facemask oxygen inlet tube 208. The front facemask retention brace 120 extending to brace distal ends 126 on either side of the facemask 110. A facemask retention strap 130 can connect to the facemask retention brace 120 essentially at the retention brace distal ends 126, as shown in
Still another embodiment of the present invention contemplates a method for using capnography facemask assembly 100. The method comprising providing a facemask 110 that includes a face covering cup 201, a capnometer 160, and an exhaled air filter 150, wherein the face covering cup 201 terminates at a cup rim 212, which defines a cup exterior 205 and a cup interior 203. The capnometer 160 having a capnometer intake port 165 and capnometer exit port 166. An exhaled air filter 150 is interposed between the capnometer 160 and an exhale port 204 located at a cup mouth region 244 of the face covering cup 201. The next step envisions putting on a facemask 110 by covering a mouth, nostrils and a portion of a face of a person with the facemask 110 with the cup interior 203 facing the face, wherein the cup rim 212 essentially seals against the face. It should be noted that the volume between the cup interior 203 and the face defines an interior environment. The step for attaching the capnometer intake port 165 to a filter sample port 157 of the exhaled air filter 150 via a sample exhaled air tube 152 can occur before your after putting on the facemask 110. After the facemask 110 is strapped on the wearer’s face and attached to the capnometer 160, essentially all of the air that exits from the interior environment is filtered before entering an exterior environment 170 via the exhaled air filter 150. The filtering step produces filtered air 154, hence “(filtered air)”. Accordingly, all of the filtered air 154 exits into the exterior environment 170 via the capnometer exit port 166 and at least one primary exit aperture 159 of the exhaled air filter 150. In this way, essentially no contaminated air/breath flows into the exterior environment 170, which can endanger staff working around the person wearing the facemask 110.
The method embodiment further includes the exhaled air filter 150 being attached to the facemask 110 and covers the exhale port 204, as shown in
The method embodiment as further shown in
The method embodiment can further include wherein the facemask 110 also comprises a facemask oxygen inlet tube 208 located at a cup nose region 242 of the face covering cup 201. Hence, one can complete the step of connecting the facemask oxygen inlet tube 208 to an oxygen source 144 and flowing oxygen from the oxygen source 144 into the interior environment. In this way, the wearer has oxygen flowing towards their nostrils so they can breathe oxygenated air from the oxygen source 144.
The method embodiment further contemplates measuring carbon dioxide levels from a portion of the filtered air 154 at the capnometer 160. The portion of the filtered air 154 passes or otherwise flows from the filter sample port 157 through the sample exhaled air tube 152 into and through the capnometer 160, where the CO2 concentration of the filtered exhaled air 154 can be sampled (where it is displayed on the capnometer display 162) and out the capnometer exit port 166. In this way, even the sampled breath from the wearer/patient is filtered before it enters the exterior environment 170.
It is to be understood that even though numerous characteristics and advantages of various embodiments of the present invention have been set forth in the foregoing description, together with the details of the structure and function of various embodiments of the invention, this disclosure is illustrative only, and changes may be made in detail, especially in matters of structure and arrangement of parts within the principles of the present invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. For example, different configurations, thicknesses, permeability, compressibility of the exhaled air filter 150 can be used without departing from the scope and spirit of the present invention. Also, though different facemask embodiments can be inventive as a whole, individual facemask components or elements can be equally inventive and stand alone. Further, the terms “one” is synonymous with “a”, which may be a first of a plurality.
It will be clear that the present invention is well adapted to attain the ends and advantages mentioned as well as those inherent therein. While presently preferred embodiments have been described for purposes of this disclosure, numerous changes may be made which readily suggest themselves to those skilled in the art and which are encompassed in the spirit of the invention disclosed.
This application claims priority to and the benefit of U.S. Provisional Pat. Application No. 63/300,486 entitled CAPNOGRAPHY FACEMASK, filed on Jan. 18, 2022.
Number | Date | Country | |
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63300486 | Jan 2022 | US |