the present invention provides an apparatus for retention of a nasal cannula . the nasal cannula comprises essentially a nasal assembly 18 , or nosepiece , with a hollow main body 15 having two directed orifices 16 , 17 near or in a patient nostrils . the orifices consist of nasal extension tubes 16 , 17 extending upwardly from a main body portion 15 and gas is supplied through supply tubes 11 , 12 to the main body 15 , which acts as a distributing manifold to the extension tubes 16 , 17 . oxygen or other gas flows through the tubes 11 , 12 to the two orifices 16 , 17 , thereby supplying the patient with pressurized ambient or oxygen enriched air . in the prior art , the cannula nosepiece 18 is held in place by extending the gas supply tubes 11 , 12 from the patient &# 39 ; s nasal area behind the patient &# 39 ; s ears . the flexible tubes 11 , 12 are bent downward behind the ears to run along the jaw area , and are held in place by an adjustable slip loop or a cinch 13 tightened below the chin to hold the nosepiece 18 in place . in the present invention , the cannula nosepiece 18 is held in place instead by extending the gas supply tubes 11 , 12 from the patient &# 39 ; s nasal area to the supply tube retainers 21 , 22 mounted above the patient &# 39 ; s ears on a hat , cap , headband , headpiece 1 or the like . the flexible tubes 11 , 12 are bent downward around the grooved retainers 21 , 22 to run downwardly , and may be held in place by an adjustable slip loop or a cinch 13 tightened below the chin to hold the nosepiece 18 in place . preferably , the tubes 11 , 12 are extended from the nosepiece 18 , and a loop is formed tending behind and around grooves the retainers 21 , 22 , then downwardly towards the tube junction 14 and cinch 13 . this provides a secure holding point for each supply tube 11 , 12 , not only from the friction provided by each groove against each tube 11 , 12 , but also from the friction of the contact between the tubes 11 , 12 in the looped portion of below the retainers 21 , 22 . alternately , the tubes 11 , 12 may be extended from the nosepiece 18 , and tend from the front to the back around the grooves the retainers 21 , 22 , then downwardly towards the tube junction 14 and cinch 13 . referring to fig2 : in the preferred embodiment of the invention , the cannula retention apparatus comprises a type of hat 1 or headgear 1 that a person can comfortably wear on their head . the embodiment in fig2 shows a typical baseball type cap 1 . the cap 1 comprises an adjustable headband 5 having a crown portion 6 affixed thereto . the headband 5 adjusts to fit the radius of the person &# 39 ; s head and the crown 6 provides material covering the top of the head surrounded by the headband 5 . the crown portion 6 essentially covers the head while providing a means of preventing the headband 5 from slipping lower on the head . the crown portion 6 may be made of typical hat materials including cotton , polyester , nylon , felt , straw , plastic , paper or other material appropriate to the type of hat construction . the baseball style of cap 1 ( as well as other types ) also generally has a visor 7 attached to the front portion of the headband 5 and crown 6 and provides a means of keeping sunlight out of ones eyes . the headband 5 may be adjustable to fit a variety of head sizes . the adjustable headband 5 is preferably constructed from an elasticized material . further adjustability may be provided by using hook and loop fasteners ( velcro ), snaps , eyelets , laces , buckles or other conventional fasteners . for elasticized embodiments of the headband 5 , the elasticized material may comprise any portion of or the entirety of the headband 5 . for the other types of fasteners , these fasteners are preferably located at the rear of the headband 5 , opposite the visor 7 . complimentary fasteners at the rear of the headband 5 are preferably located on detachable / attachable ends 51 , 52 of the headband 5 to provide the adjustment capability . wherein the embodiment of the invention shown in fig2 illustrates a baseball type of cap 1 , many other types of headgear 1 are envisioned for use in the cannula retainer , including but not limited to : hats for men , women , or children ; hospital caps ; golf caps ; tennis caps ; fishing hats ; western hats ; men &# 39 ; s and women &# 39 ; s dress hats , derbies ; fedoras ; bonnets ; helmets ; construction hard hats ; straw hats ; visor - less caps ; berets ; winter hats ; and any variety of hats on or within which retainers 20 may be attached . referring again to fig2 : the cannula retention assembly further comprises retainers 20 which in this embodiment comprise a pair of dowels 21 , 22 attached to the headband 5 of the cap 1 . the dowels 21 , 22 may be attached by pop riveting , gluing , sewing , screwing or otherwise to the headband 5 and or crown 6 of the cap 1 . in the most preferable embodiment of the invention , the dowels 21 , 22 are connected to the cap 1 using hook and loop fasteners ( such as velcro ). for example , a length loop fastener material 32 may be sewn or glued to the headband 5 and / or crown 6 of the cap 1 , while the dowels 21 , 22 may be attached to a segment of hook material 80 . this allows the dowels 21 , 22 to be placed anywhere along the length of loop material 32 , which provides the ability to adjust the dowels &# 39 ; 21 , 22 placement to one &# 39 ; s preferences . the hook material 32 may extend around the whole circumference of the headband 5 to maximize adjustability of the dowels 21 , 22 . however , in the preferred embodiment of the invention a first length of loop ( or hook ) 32 material is sewn or glued from the right edge of the visor 7 around the headband 5 to the area of the headband 5 just behind the right ear . likewise , a second length of loop ( or hook ) material 32 is sewn or glued from the left edge of the visor 7 around the headband 5 to the area of the headband 5 just behind the left ear . referring now to fig4 – 6 : the retainers 20 comprising dowels 21 , 22 are preferably constructed so as to retain supply tubes 11 , 12 and a nasal cannula nosepiece 18 therebetween , and to be adjustable as to their location on the headband 5 or crown 6 of the cap 1 . since dowels 21 and 22 are essentially identical , the description herein of the first dowel 22 applies equally to the second dowel 21 , and for simplicity is identified as dowel 40 in the fig4 – 6 . the dowel 40 preferably comprises a rounded structure with a groove 45 therein , which is adapted to retain a cannula supply tube 11 or 12 therein , without bending or blocking the tube 11 , 12 . in the embodiment of the dowel 40 of fig4 – 6 , the dowel 40 comprises a cylindrical block of material . the cylindrical block may be constructed from wood , plastic , metal , leather , rubber , cardboard , foam rubber , resilient styrofoam , polystyrene or any material sufficiently rigid to support the supply tubes 11 or 12 and cannula nosepiece 18 therebetween . to maximize comfort to the wearer and provide a more secure attachment point to the cap 1 , the dowels 40 are preferably constructed of a light and rigid material such as foam rubber , which is not only light , but also simplifies assembly because of the ability to easily fabricate a dowel using a punch . the diameter of the cylinder is preferably between 0 . 5 – 2 . 0 inches to provide a light dowel 40 that has a sufficient diameter to preclude bending of a cannula tube 11 , 12 supported thereby . the height of the cylinder is at least as wide as the diameter of a standard cannula tube 11 , 12 and preferably at least twice as wide as the cannula tube 11 , 12 diameter , or approximately 0 . 3 – 1 . 0 inches . the cylindrical dowel 40 also has a circumferential groove 45 therein . the groove 45 may be centered between the proximal 41 and distal 43 circular portions of the dowel 40 as in fig5 , but is preferably located at the proximal side 41 of the dowel 40 as in fig6 . the depth of the groove 45 must be sufficient to retain a cannula tube 11 , 12 therein . more preferably , the depth of the groove 45 is at least half the diameter of the cannula supply tube 11 , 12 and up to 3 times the tube 11 , 12 diameter , or approximately 0 . 1 – 0 . 6 inches . in the preferred embodiment of the invention , the dowel 40 is are of unitary construction . however , in an alternate embodiment of invention , the dowel 40 may be constructed with two or more modules 41 , 42 , 43 that are attached together . this may be accomplished using two disks 41 , 43 having a first circumference , and attaching the two outer disks 41 , 43 to the opposing faces of a third disk 42 having a smaller circumference . this creates a modular dowel 40 having a first circumference , with a central circumferential groove 45 having a smaller circumference than the proximal 41 and distal 43 outer portions of the modular dowel 40 as in fig5 . preferably , the dowel 40 is constructed using a disk 43 having a first circumference , and attaching the disk 43 to the third disk 42 which has a smaller circumference . this creates a modular dowel 40 having a first circumference , with a circumferential groove 45 on the proximal portion 41 of the dowel 40 having a smaller circumference than distal 43 outer portion of the modular dowel 40 as in fig6 . referring to fig4 and 5 : in one embodiment of the dowel 40 , the face of the proximal portion 41 of the cylindrical dowel 40 is affixed to one face of a length of hook ( or loop ) fastener material 80 . the dowel 40 is attached to the back face of the hook or loop material 80 , i . e ., the face of the material opposite to the attachment point of the dowel 40 has the hook or loop fasteners thereon . this attachment may be accomplished by gluing , sewing , riveting or like attachment methods . this allows the dowel 40 and attached hook or loop fastener material 80 to be attached to the loop or hook material 81 along the headband 5 or crown 6 of the cap 1 . alternatively , the dowel 40 may be attached directly to the cap 1 by sewing , gluing , riveting or other attachment methods . referring now to fig4 and 6 : in the preferred embodiment of the dowel 40 , the face of the proximal grooved portion 42 of the cylindrical dowel 40 is affixed to one face of a length of hook ( or loop ) fastener material 80 . the dowel 40 is attached to the back face of the hook or loop material 80 , i . e ., the face of the material opposite to the attachment point of the dowel 40 has the hook or loop fasteners thereon . this attachment may be accomplished by gluing , sewing , riveting or like attachment methods . this allows the dowel 40 and attached hook or loop fastener material 80 to be attached to the loop or hook material 81 along the headband 5 or crown 6 of the cap 1 . alternatively , the dowel 40 may be attached directly to the cap 1 by sewing , gluing , riveting or other attachment methods . referring now to fig7 – 8 : an alternate retainer assembly 20 for the supply tubes 11 , 12 comprises a pair of grooved arc retainers 50 which may similarly be affixed to the material 81 on the headband 5 or crown 6 of the cap 1 . the arced retainers 50 are preferably constructed so as to retain supply tubes 11 , 12 and a nasal cannula nosepiece 18 therebetween , and to be adjustable as to their location on the headband 5 or crown 6 of the cap 1 . each arced retainer 50 preferably comprises an arced structure 50 with a groove 54 therein , which is adapted to retain a cannula supply tube 11 , 12 therein , while maintaining a bend in the tube 11 , 12 . in the embodiment of the retainer 50 of fig6 and 7 , each arced retainer 50 comprises a bent length of material 50 . the retainer 50 may be constructed from wood , plastic , metal , leather , hard rubber , or any material sufficiently rigid to support the supply tubes 11 , 12 and cannula nosepiece 18 therebetween . to maximize comfort to the wearer and provide a more secure attachment point to the cap 1 , the dowels 50 are preferably constructed of a light and rigid material such as plastic . the thickness of the material is preferably between 0 . 2 to 0 . 5 inches to provide a light retainer 50 . the arc preferably has a length and a radius of curvature sufficient to preclude kinking and blocking of a cannula tube 11 , 12 supported thereby . the length of the arc may vary from between 0 . 5 inches to up to 3 inches , and the radius of curvature may be as few as 1 inch or as much as 10 inches . in the most preferred embodiment , the length of the arc is approximately 1 . 5 inches with a radius of curvature of 4 inches . the width of the arced retainer is at least as wide as the diameter of a standard cannula tube and preferably at least twice as wide as the cannula tube diameter , or approximately 0 . 3 – 1 . 0 inches . the arced retainer 50 also has a groove 54 along the top portion of the retainer 50 , preferably centered in the width dimension between the proximal 55 and distal 53 portions of the retainer 50 . the depth of the groove 54 must be sufficient to retain a cannula tube 11 , 12 therein . more preferably , the depth of the groove 54 is at least half the diameter of the cannula supply tube 11 , 12 and up to 3 times the tube diameter , or approximately 0 . 1 – 0 . 4 inches . on the central portion of the proximal portion 55 of each arced retainer 50 is a connection point 57 for securing the retainer 50 to one face of a length of hook ( or loop ) fastener material . the connection point 57 is attached to the back face of the hook or loop material 80 , i . e ., the face opposite to the attachment point 57 of the retainer 50 has the hook or loop fasteners thereon . in fig6 and 7 , this connection point is shown as a flat disc 57 with a small cantilever 56 that connects at the central portion of the arced retainer 50 . the attachment point 57 however may comprise shapes other than a disc , such as a square , and the cantilever 56 may be eliminated . with the cantilever 56 eliminated , the arced retainer 50 may be connected at more than one point to the disc 57 . the attachment between the arced retainer 50 , cantilever 56 , disk 57 and fastener 80 may be accomplished by gluing , sewing , riveting , snaps or like attachment methods . this allows the retainer 50 and attached hook or loop fastener material 80 to be attached to the loop or hook material 81 along the headband 5 or crown 6 of the cap 1 . alternatively , the retainer 50 , cantilever 56 or disk attachment point 57 may be affixed directly to the cap 1 by sewing , gluing , riveting or other attachment methods . referring now to fig9 – 11 : in yet another embodiment of retainer assembly 20 for a cannula nosepiece 18 and supply tubes 11 , 12 , the retainer 20 comprises a pair of grooved triangular retainers 60 having rounded apexes which may similarly be affixed to the material 81 on the headband 5 or crown 6 of the cap 1 . the rounded triangular retainers 60 are preferably constructed so as to retain supply tubes 11 , 12 and a nasal cannula nosepiece 18 therebetween , and to be adjustable as to their location on the headband 5 or crown 6 of the cap 1 . each rounded triangular retainer 60 preferably comprises an arced structure 60 with a groove 64 therein , which is adapted to retain a cannula supply tube 11 , 12 therein , while maintaining a bend in the tube 11 , 12 . in the embodiment of the retainer 60 of fig9 – 11 , each rounded triangular retainer 60 comprises a block of material essentially shaped as a triangular prism , with the upward pointed apex being rounded . the retainer 60 may be constructed from wood , plastic , metal , leather , rubber , cardboard , foam rubber , resilient styrofoam , polystyrene or any material sufficiently rigid to support the supply tubes 11 , 12 and cannula nosepiece 18 therebetween . to maximize comfort to the wearer and provide a more secure attachment point to the cap 1 , the rounded triangular retainers 60 are preferably constructed of a light and rigid material such as foam rubber , which is not only light , but also simplifies assembly because of the ability to easily fabricate a dowel using a punch . the thickness of the material is preferably between 0 . 2 to 0 . 5 inches to provide a light retainer 60 . the rounded apex of the triangular retainer 60 preferably has an arc length and a radius of curvature sufficient to preclude kinking and blocking of a cannula tube 11 , 12 supported thereby . the arc length may vary from between 0 . 5 inches to up to 3 inches , and the radius of curvature may be as few as 1 inch or as much as 10 inches . in the most preferred embodiment , the arc length is approximately 1 . 5 inches with a radius of curvature of 4 inches . the width of the rounded triangular retainer 60 is at least as wide as the diameter of a standard cannula tube 11 , 12 and preferably at least twice as wide as the cannula tube 11 , 12 diameter , or approximately 0 . 3 – 1 . 0 inches . the rounded triangular retainer 60 also has a groove 64 along the top portion of the retainer 60 , which is preferably located at the proximal portion of the retainer 60 , but which may be centrally or anywhere along in the width dimension between the proximal 65 and distal 63 portions of the retainer 60 . the depth of the groove 64 must be sufficient to retain a cannula tube 11 , 12 therein . more preferably , the depth of the groove 64 is at least half the diameter of the cannula supply tube 11 , 12 and up to 3 times the tube 11 , 12 diameter , or approximately 0 . 1 – 0 . 4 inches . referring to fig9 and 10 : in one embodiment of the invention , the rounded triangular retainers 60 are of unitary construction . however , in an alternate embodiment of invention , each rounded triangular retainer 60 may be constructed with modules ( not shown ) that are attached together . this may be accomplished using two rounded triangular portions having a first width , height , and circumference , and attaching the proximal 65 and distal 63 rounded triangular portions to the faces of a third rounded triangular portion 67 having a smaller height and circumference . this creates a modular rounded triangular retainer 60 having a first width , height , and circumference , and having a central groove 64 along the upper sides adjacent the rounded apex , wherein the groove 64 has a smaller height and circumference than the outer portions 65 , 63 of the modular rounded triangular retainer 60 . referring to fig9 and 11 : in the preferred embodiment of the triangular retainers 60 , the rounded triangular retainers 60 are of unitary construction . however , in an alternate embodiment of invention , each rounded triangular retainer 60 may be constructed with modules ( not shown ) that are attached together . this may be accomplished using a distal rounded triangular portion having a first width , height , and circumference , and attaching distal 63 rounded triangular portion to the face of a third rounded triangular portion 67 having a smaller height and circumference . this creates a modular rounded triangular retainer 60 having a first distal width , height , and circumference , and having a proximal groove 64 along the upper sides adjacent the rounded apex , wherein the groove 64 has a smaller height and circumference than the outer portion 63 of the modular rounded triangular retainer 60 . on the central part the proximal portion 65 or 67 of each rounded triangular retainer 60 is a connection point 61 for securing the retainer 60 to one face of a length of hook ( or loop ) fastener material 80 . the connection point 61 is attached to the back face of the hook or loop material 80 , i . e ., the face of the material 80 opposite to the attachment point 61 of the retainer 80 has the hook or loop fasteners thereon . in fig9 and 10 , this connection point 61 is shown as a flat disc 61 with a small cantilever 66 that connects at the central portion proximal portion 65 of the rounded triangular retainer 60 . the attachment point 61 however may comprise shapes other than a disc , such as a square , and the cantilever 66 may be eliminated . with the cantilever 66 eliminated , the rounded triangular retainer 60 may be connected at more than one point to the disc 61 . the attachment between the rounded triangular retainer 60 , cantilever 66 , disk 61 and fastener 80 may be accomplished by gluing , sewing , riveting , snaps or like attachment methods . fig1 shows the preferred attachment method between the reatainer 60 and the fastener 80 , wherein the fastener material 80 is attached directly ( as by gluing ) to the proximal grooved portion 67 of the retainer 60 . this allows the retainer 60 and attached hook or loop fastener material 80 to be attached to the loop or hook material 81 along the headband 5 or crown 6 of the cap 1 . alternatively , the retainer 60 , cantilever 66 or disk attachment point 61 may be affixed directly to the cap 1 by sewing , gluing , riveting or other attachment methods . referring now to fig2 and 3 : the retainers 40 , 50 and 60 described herein above are attached to an existing hat , cap , or other headgear 1 having essentially unitary headband 5 and crown portions 6 . the crown portion 6 may have right , left , front and rear portions attached to the corresponding portions of the headband portion 5 . in another embodiment of the invention , the headgear 2 comprises another adjustable types of headgear , having separate attachable headband 5 and crown portions 25 . the headband 5 preferably comprises a length of adjustable material , such as a band cloth material , which may also be elasticized . for example the headband 5 may comprise a polyester and / or cotton cloth band with elastic band ( s ) woven therein . the headband 5 may also comprise a length of hook or loop fastener material . the headband 5 may be of unitary construction ( circular ), but preferably has a detachable , adjustable portion 51 , 52 therein . more specifically , a length of elasticized material may be used having fasteners on opposing ends 51 , 52 thereof . more specifically , a first end 51 of the band may have hook fasteners on the outside face , and on the opposing end 52 loop fasteners on the inside face , such that the hook and loop fasteners are in mating / engageable relationship . alternatively , hook and loop fasteners may be used on the opposite ends 51 , 52 , or opposite faces , or both to provide a wide range of engageability . the headband 5 most preferably comprises a length of loop fastener material , having a portion of hook fastener material affixed to the inside face of one opposing end 51 or 52 thereof for engagement with the opposite end 52 or 51 thereof . furthermore , other means for engaging the ends 51 , 52 of the headband 5 to each other may include snaps , buttons , buckles , cord and eyelet , or other types of fasteners . this provides a headband portion 5 that is not only elasticized to fit snugly about the head , but also has fasteners to provide a headband 5 that fits a variety of head sizes . referring again to fig3 : the headgear 2 also comprises a crown portion 25 that is engageable with the headband portion 5 . the crown portion 25 comprises crown band 25 made from a length of adjustable material , such as a band cloth material , which further may be elasticized . for example the crown band 25 may comprise a polyester and / or cotton cloth band with elastic band ( s ) woven therein . the crown band 25 is preferably adjustably engageable with and detachable from the headband portion 5 . more specifically , a length of elasticized material may be used for the crown band 25 having fasteners 36 on opposing ends 26 , 27 thereof , engageable with complimentary fasteners 32 on some or all of the headband 5 . more specifically , each end 26 , 27 of the crown band 25 may have hook fasteners 36 on the inside face thereof engageable with loop fasteners 32 on the outside faces of the headband 5 , such that the hook and loop fasteners 36 , 32 are in mating , engageable relationship . the fasteners 32 on the headband 5 may cover the majority of the outside surface of the headband 5 , or may extend along only the front and sides of the headband 5 , to at least above the portion of the headband 5 to be situated above the ears . this provides a great number of attachment points for the ends 26 , 27 of the crown band 25 to be adjustably engaged with the headband 5 . alternatively , the crown band 25 may have loop fasteners 36 thereon , and the headband 5 may have hook fasteners 32 thereon . the hook and loop fasteners 32 , 36 may be used on the opposite ends , or opposite faces of the crown band 25 , or both to provide a wide range of engageability . furthermore , other means for engaging the ends 26 , 27 of the crown band 25 to the headband 5 may include snaps , buttons , buckles , cord and eyelet , or other types of fasteners 36 . this provides a crown band portion 25 that is not only elasticized to fit snugly over the head and prevent slippage of the headband 5 , but also has fasteners 36 to provide a crown band 25 that fits a variety of head sizes . in the preferred embodiment of the invention , the crown band portion 26 is affixed to the headband portion 5 above or in front of the user &# 39 ; s ears . however , in alternate embodiments ( not shown ), the crown band 25 portion may be aligned parallel to a plane between the user &# 39 ; s ears . alternatively , the crown band 25 may be affixed and aligned perpendicular to a plane between the user &# 39 ; s ears , or at any angle to the plane that provides a secure attachment and retention of the headgear 2 on the user &# 39 ; s head . referring now to fig2 – 3 and fig4 – 11 : the headgear 2 , comprising a headband portion 5 and crown band portion 25 ) are adapted for affixing a pair of cannula retainers 20 thereto . specifically , a pair of cannula retainers 20 of the types 40 , 50 , 60 shown in fig4 – 11 , are adapted to be adjustably affixed to the crown portion 25 and / or headband portion 5 of the headgear 2 . in the preferred embodiment of the invention , the crown band 25 is affixed with hook type fasteners 36 to the loop type fasteners 32 on the portion of the headband 5 adjacent the user &# 39 ; s ears . the cannula retainers 20 , ( i . e ., dowels 40 , arced retainers 50 , or rounded triangular retainers 60 ) each are backed by a length of hook type fasteners 80 . the outside faces of both the crown portion 25 and headband portion 5 have exposed loop type fasteners 37 , 32 thereon for affixing the hook fasteners 80 of the retainers 20 thereto . thus , the hook fasteners 80 on the retainers 20 may be affixed to loop fasteners 32 , 37 on any portion of the headband 5 or the crown band 25 . in yet another alternative embodiment of the invention , the exposed surfaces of the headband 5 and crown band 20 may have hook type fasteners 32 , 37 thereon , and the cannula retainers 20 may have loop fasteners 80 thereon , for affixing to the hook fasteners 32 of the headband and / or the hook fastener 37 of the crown band 25 . in yet another embodiment , the cannula retainers 20 may be permanently affixed to the outer faces of the ends 26 , 27 of the crown band 25 , by means of sewing , glue , snaps , grommets , rivets or the like . thus , the present invention provides a cannula retention apparatus comprising an article of headgear 1 , 2 having retainers 20 adjustably affixed thereon for retention of cannula supply tubes 11 , 12 . the retainers 20 have rounded upper surfaces with grooves therein adapted for placement and retention of cannula supply tubes 11 , 12 . the supply tubes 11 , 12 may tend from the nasal cannula nosepiece 18 to the front of each retainer 20 , into the groove and then tend downwardly from the back of each retainer 20 to the cannula tube junction 14 below the user &# 39 ; s chin . alternately , for additional security of retention of the supply tubes 11 , 12 , the tubes may tend upwardly from the nasal cannula nosepiece 18 to the back portion of the retainers 20 , through the groove in each retainer 20 , and then tend downwardly from the front of each retainer 20 to the cannula tube junction 14 below the user &# 39 ; s chin . this placement of the cannula tubes 11 , 12 provides a more secure retention because the downward tending portion of the tube 11 , 12 contacts the upward tending portion of the tube 11 , 12 , and the friction of their mutual contact prevents the tubes 11 , 12 from sliding in the grooves . the head gear 1 , 2 is preferably adjustable to provide a proper fit to the user &# 39 ; s head . the retainers 20 are also preferably adjustable to allow their placement in the most comfortable position with relation to the cannula tubes 11 , 12 and the user &# 39 ; s ears and face . this prevents the positioning of the tubes 11 , 12 on the ears and face of the user , which is uncomfortable and is more prone to falling off the user &# 39 ; s face . additionally , the positioning off the ears and face prevents chaffing and pain , as well as dislocation of the tubes 11 , 12 and cannula nosepiece 18 due to body movement of the patient , i . e ., when walking or during sleep . while the above description contains many specificities , these should not be construed as limitations on the scope of the invention , but rather as exemplification of preferred embodiments thereof . many other variations are possible , for example : while in the preferred embodiment of the invention the headgear comprises either a cap or an adjustable headband and crownband , many other types of headgear including helmets , western hats , surgical caps , ski hats ; hospital caps ; golf caps ; tennis caps ; fishing hats ; western hats ; men &# 39 ; s and women &# 39 ; s dress hats , derbies ; fedoras ; bonnets ; helmets ; construction hard hats ; straw hats ; visor - less caps ; berets ; winter hats ; and practically any type of headgear may be used ; the headgear may be constructed from a variety of materials including cotton , polyester , cotton / poly blends , elasticized material , lycra , silk , felt , leather , plastic , paper , straw and any variety of materials used in making hats ; the headgear may comprise a headband and a crown portion , simply a headband , or a headband and one crown band , or multiple crown bands ; the retainers may comprise grooved cylinders , arcs , rounded triangles , rounded squares , or a variety of other rounded polygonal prisms with grooves in the rounded upper surfaces thereof ; the retainers may be constructed from wood , plastic , metal , leather , rubber , cardboard , foam rubber , polystyrene , resilient styrofoam or any material sufficiently rigid to support the supply tubes and cannula ; the fasteners for the headband , crown band , and / or retainers may comprise snaps , grommets , hook and eye , hook and loop , laces , buckles , glue , rivets , sewing , or any other known means of attachment , either permanent or detachable .
a nasal cannula apparatus is provided for use by patients desiring a comfortable arrangement . the nasal cannula apparatus is particularly suited for long - term oxygen users , for extended wear in both standing , resting and supine positions . the nasal cannula apparatus has headgear and retainers for holding the gas supply tubes , which are adjustable to allow fast and easy adjustment to size . the headgear and retainers allow the cannula tubes to be held in a position which prevents skin discomfort and irritation , and which promotes healing of such irritation , injuries and sores .