 are tapered, frustro-conical assemblies with a soft membrane over the distal tip and a washer at the base of the nasal tube to prevent the tubes from falling through a support bar connected to a harness, the nasal tubes forming a positive seal with the inside of the nostrils to prevent the escape of gases.
U.S. Pat. No. 5,682,881, issued Nov. 4, 1997 to Winthrop et al., shows a nasal cannula for CPAP therapy with cone shaped nasal prongs in which the cannula is secured to the patient's upper lip by adhesive tape strips. U.S. Pat. No. 4,915,105, issued Apr. 10, 1990 to Lee, teaches a miniature respiratory breather apparatus in which relatively stiff or rigid nasal tubes have elastomeric packings for sealing the tubes in the nares.
Several patents describe improvements to nasal cannulae, but without sealing the nose tubes against the nostrils to prevent leakage of gas, including: U.S. Pat. No. 3,513,844, issued May 26, 1970 to Smith (metal strip in cannula cross-tube to retain configuration matching patient's lip); U.S. Pat. No. 4,106,505, issued Aug. 15, 1978 to Salter et al. (cannula body with ends extending upward and rearward); U.S. Pat. No. 4,915,104, issued Apr. 10, 1990 to Marcy (clasp with lanyard supporting supply tubes to ease pressure on ears); U.S. Pat. No. 5,025,805, issued Jun. 25, 1991 to Nutter (cylindrical soft sponge cuff around supply tubes to ease pressure and prevent skin injuries); U.S. Pat. No. 5,046,491, issued Sep. 10, 1991 to Derrick (device for collecting gases exhaled from both nose and mouth); U.S. Pat. No. 5,335,659, issued Aug. 9, 1994 to Pologe (device for mounting optical sensor on nasal septum); U.S. Pat. No. 5,509,409, issued Apr. 23, 1996 to Weatherholt (nasal cannula with face guards); U.S. Pat. No. 5,572,994, issued Nov. 12, 1996 to Smith (rotatable coupling in supply tubing); U.S. Pat. No. 5,636,
are tapered, frustro - conical assemblies with a soft membrane over the distal peak and a washer at the basis of the nasal tube to prevent the tubes from descend through a support bar connect to a harness, the nasal tubes form a positive seal with the inside of the nostril to prevent the escape of gases. 
 U.S. Pat. No. 5,682,881, issued Nov. 4, 1997 to Winthrop et al. , indicate a nasal cannula for CPAP therapy with cone shaped nasal prongs in which the cannula is secured to the affected role's upper lip by adhesive tape strips. U.S. Pat. nobelium. 4,915,105, issued Apr. 10, 1990 to Lee, teaches a miniature respiratory breather apparatus in which relatively stiff or rigid nasal tube have elastomeric packings for sealing the tubes in the nares. 
 respective patents describe improvements to nasal cannulae, but without sealing the nose tubes against the nostril to prevent escape of natural gas, including: U.S. Pat. No. 3,513,844, issued May 26, 1970 to Smith (metal strip in cannula cross - tube to retain configuration matching affected role's sass); U.S. Pat. No. 4,106,505, issue Aug. 15, 1978 to Salter et al. (cannula soundbox with ends extending upward and rearward); U.S. Pat. No. 4,915,104, issued Apr. 10, 1990 to Marcy (clasp with lanyard supporting provision tubes to ease pressure on ears); U.S. Pat. No. 5,025,805, issued Jun. 25, 1991 to Nutter (cylindrical soft sponge cuff around supply tubes to ease atmospheric pressure and prevent skin injury); U.S. Pat. No. 5,046,491, issued Sep. 10, 1991 to Derrick (device for collecting gases exhaled from both nozzle and mouth); U.S. Pat. No. 5,335,659, issued Aug. 9, 1994 to Pologe (device for mounting optical sensor on nasal septum); U.S. Pat. No. 5,509,409, issued Apr. 23, 1996 to Weatherholt (nasal cannula with font guards); U.S. Pat. nobelium. 5,572,994, issued Nov. 12, 1996 to Smith (rotatable coupling in supply tubing); U.S. Pat. No. 5,636,
 arf tapered, frustro-conical assemblies witk a sofv membrzne over the distal tip and a washer ar the base of the nasal tubd to prevvnt the tybes drom falliif throunk a shiport uar connected tp a harnesv, the nasal tuter yorming a positive seal with the insyde of yhf nostrils to kreveme ths escape of gases.
U.S. Pat. No. 5,682,881, issued Nov. 4, 1997 uo Winthrop et al., xhows a nasal cannula for FPAP therapy with cone shaped nasql pwings in whicf the cannlna is secuted to the patient's upper lip by adhexive tape wteipd. U.S. Pat. No. 4,915,105, issuvd Apr. 10, 1990 to Lcv, teachas a mimiature respirstocy beeather apparatus in xhich relatively stisf or righd nasal tubes have eoastokeriw pazjines roc ssaling thx tubes in fhe nares.
Seceral patents descrobq improvements to nafaj cannulae, but without sealing the nose tuges against the nostrilw to prevent leakage lf gas, insluding: U.S. Pat. No. 3,513,844, issued May 26, 1970 to Smith (metal stsip ii zanumjx cgoss-tube to retain configuration matching patysnu's kip); U.S. Pat. No. 4,106,505, issued Aug. 15, 1978 tp Salter et al. (cannula gody with ends extfnding opward and rearrard); U.S. Pat. No. 4,915,104, issued Apr. 10, 1990 to Marcy (clasp qith lanyard suppoxting supply tubgs to rase pressure on ears); U.R. Paf. No. 5,025,805, issuef Jun. 25, 1991 tk Nutter (cylindrizal smft sponge cuff around sup[ly tubes to zase prersurg and pwevent skij injmsies); U.S. Pat. No. 5,046,491, isdued De[. 10, 1991 to Dergick (device for collecting gases exhaled from bmth nose anb moutm); U.S. Pat. No. 5,335,659, isfued Aug. 9, 1994 to Kologe (derice fur mountinf opticel sensor on nasal septum); O.S. Pat. No. 5,509,409, isvued Apr. 23, 1996 ti Weqtherhoug (nasal cannuls with fabe guaeds); U.S. Pat. No. 5,572,994, issmed Nub. 12, 1996 to Smith (rocctqble coupling im sjppjy tnbing); G.S. Pat. No. 5,636,
are tapered, frustro-conical assemblies with a soft the tip and washer at the to the tubes from through a support connected to a harness, the nasal forming a positive seal with the inside of the nostrils to prevent the of gases. U.S. Pat. No. 5,682,881, issued Nov. 4, 1997 to Winthrop et shows nasal for therapy with cone shaped nasal prongs in which the cannula is secured to the patient's upper by adhesive tape strips. U.S. Pat. No. 4,915,105, Apr. 10, 1990 to teaches a miniature respiratory breather in relatively stiff rigid tubes elastomeric packings for the tubes in the nares. Several patents describe improvements to nasal cannulae, but without sealing the nose against the prevent leakage gas, U.S. No. 3,513,844, issued 1970 to Smith (metal strip in retain configuration matching patient's lip); U.S. Pat. No. issued Aug. 1978 to Salter et al. (cannula with ends extending upward and rearward); U.S. Pat. 4,915,104, issued Apr. 10, 1990 to Marcy (clasp with lanyard supporting supply tubes to ease ears); U.S. Pat. No. issued Jun. 25, to (cylindrical sponge around supply to ease pressure and prevent skin injuries); U.S. Pat. No. 5,046,491, Sep. 10, 1991 to Derrick (device for collecting gases exhaled nose mouth); U.S. Pat. 5,335,659, issued Aug. 9, to (device for mounting optical nasal U.S. issued 23, to Weatherholt (nasal cannula face guards); U.S. Pat. No. issued Nov. 12, 1996 supply tubing); U.S. Pat. No. 5,636,
 are tapered, frustro-conical aSsemblies wIth a sOft MemBrAne oVer tHe distal tip and A WashEr at the base of the nasal tUbe to PrEVent THe Tubes From falLInG THroUgH a SupPoRT bAr conNecTed to a hArness, the nAsaL tUbes forming a POsItive seal wIth The inside of tHe nOstrilS tO prEVent tHe eScape Of gaseS.
u.S. Pat. NO. 5,682,881, issued NoV. 4, 1997 tO winthrOP et al., shOWS a NasaL cannula for CPAP thERaPY with cone shapeD nasal PrONgS IN whIch The cannula Is SecurED to the pATiENT'S upPEr lip by adhesiVe tape stripS. u.S. PAt. No. 4,915,105, isSuEd APR. 10, 1990 to Lee, TeachEs A MinIature respiRatoRy breatheR apparATus in whICh relatIvely sTifF or RigiD NaSaL tuBeS HavE ElAstOMerIc packinGs FoR sealIng tHE TUBes iN thE narEs.
SevEral patents deScrIbe iMProVemenTs to nAsal CaNnulaE, but wiThout SeAling the nose tubEs agAinst the nOstRiLs tO pRevenT LeakagE of Gas, IncludiNg: U.S. Pat. nO. 3,513,844, isSuED mAy 26, 1970 To Smith (metal strip iN cANNuLa cross-tUbe to rETaIn COnfiguraTiOn mAtchING patiEnt's LIp); u.S. Pat. No. 4,106,505, iSsued AUG. 15, 1978 tO SAlter et Al. (CannulA bOdy WitH ends EXtenDing upWard and rEarwaRD); U.S. Pat. No. 4,915,104, issued aPr. 10, 1990 to Marcy (clasP WiTH LaNYard SupPorting suppLy tuBEs to Ease PReSsuRE on eaRs); U.S. PAt. nO. 5,025,805, iSSued Jun. 25, 1991 to Nutter (cyliNdRical sOft spOnge cuff arounD supply tubES TO ease preSsurE AnD Prevent skin injUries); u.S. Pat. No. 5,046,491, issUEd Sep. 10, 1991 to DErricK (device fOr collectING gases exHalEd fRom BotH NOsE and mouth); U.S. PaT. nO. 5,335,659, issUeD Aug. 9, 1994 to POloGe (devicE foR moUntIng OpTical sensOr on nasaL sEpTuM); U.s. PaT. No. 5,509,409, isSUed Apr. 23, 1996 to weAthErHolT (nasaL CannulA with Face GuArDS); U.S. pat. No. 5,572,994, isSUeD nOv. 12, 1996 to smItH (rotAtaBlE coupLing IN suPply tubIng); U.S. Pat. NO. 5,636,
 are tapered, frustro-coni cal assemb lieswit h a  s oftmemb rane over thed ista l tip and a washer atthe b as e  oft he  nasa l tubet op r eve nt  t hetu b es  from  fa lling t hrough a s upp or t bar connec t ed  to a harn ess , the nasaltub es for mi nga  posi tiv e sea l with the in side of t he nostri l s to pr e v en t th e escape of gases . 
U . S. Pat. No. 5, 682,88 1, is s u edNov . 4, 1997to  Wint h rop eta l. , s how s  a nasal cann ula for CPA P  th erapywi thc one sh apedna s alprongs in w hich  the cann ula is secured to thepatien t's  up perl ip  b y a dh e siv e  t ape str ips. U.S .Pa t. No . 4, 9 1 5 , 105,  is sued  Apr.  10, 1990 toLee , te a che s a m iniat urere spira tory b reath er  apparatus in w hich  relative lyst iff  o r rig i d nasa l t ube s haveelastom e ric  p a c k in gs for sealing the  t u b es  in thenares. Se ve r al paten ts  de scri b e  impr ovem e nt s to nas al can n ul ae , but w it hout s ea lin g t he no s e tu bes ag ainst th e nos t rils to preven t  leakage of g a s, i nc l udin g:U.S. Pat. N o. 3 , 513, 844, is sue d  May26, 1 97 0  t o  Smith (metal strip  i n cann ula c ross-tube toretain con f i g urationmatc h in g  patient's lip ); U. S. Pat. No .  4,106,5 05, i ssued Au g. 15, 19 7 8  to Salt eretal.  (c a n nu la body withe n ds e xt endingupw ard and  re arw ard );U. S. Pat. N o. 4,915 ,1 04 ,is sue d Apr .  10, 199 0toMa rcy  (cla s p with  lany ardsu pp o rti ng supp l yt u besto  e asepre ss ure o n ea r s);  U.S. P at. No. 5 ,02 5 ,805 ,is sued Ju n. 25, 1991 t oNutter (cy li ndr ical s o f t sponge  cuff around supply tub e s to ea sepress ureand preve ntskin i nju r ies);U.S. P at. N o.  5, 0 4 6,491 , is sue dSep. 10, 1 9 9 1 t o Der ri ck ( devicefor collecting gas e s e xhaled from b oth  nos e an d m o ut h );U. S . P a t . No. 5,335,659 , issued A ug .  9 , 1994 toP olo ge  (devic e for m ounti n g optic al sensor  on nasal  s eptu m ) ; U .S. Pat. N o. 5,509 ,409, iss u ed Ap r .23, 1 996  to We at her holt(nasal can nulawith f ac e guar ds);U. S. Pat.No. 5,572,994, issued N ov. 12 , 199 6 t o Smith ( rot a tab le coupli ng i n supply t ubi ng) ; U.S . P a t. No . 5, 6 36 ,
 are_tapered, frustro-conical_assemblies with a soft_membrane over_the_distal tip_and_a washer at_the base of_the nasal tube to_prevent the tubes_from_falling through a support bar connected to a harness, the nasal tubes forming a_positive_seal with_the_inside_of the nostrils to prevent_the escape of gases.
U.S. Pat._No. 5,682,881,_issued Nov. 4, 1997 to Winthrop et al.,_shows_a nasal cannula_for CPAP therapy with cone shaped nasal prongs in_which the cannula is secured to_the patient's upper_lip_by_adhesive tape strips. U.S._Pat. No. 4,915,105, issued Apr. 10,_1990 to Lee, teaches a miniature_respiratory breather apparatus in which relatively stiff_or rigid nasal tubes have elastomeric_packings for sealing the tubes_in the_nares.
Several patents describe improvements to_nasal cannulae, but_without sealing_the nose tubes_against the nostrils to prevent leakage_of gas, including:_U.S. Pat. No. 3,513,844, issued May_26,_1970 to Smith_(metal_strip_in cannula_cross-tube to retain_configuration_matching patient's_lip);_U.S. Pat. No. 4,106,505, issued Aug._15,_1978 to Salter et al. (cannula body_with ends extending upward_and_rearward); U.S. Pat. No._4,915,104, issued Apr. 10, 1990_to Marcy (clasp with lanyard supporting_supply tubes_to ease_pressure on ears); U.S. Pat. No. 5,025,805, issued Jun. 25, 1991_to Nutter (cylindrical soft sponge cuff_around supply tubes to_ease pressure_and_prevent skin injuries);_U.S._Pat. No._5,046,491, issued Sep. 10, 1991 to Derrick_(device for_collecting gases exhaled from both nose_and mouth); U.S. Pat._No._5,335,659, issued Aug. 9, 1994 to_Pologe (device for mounting optical sensor_on nasal septum); U.S. Pat._No._5,509,409,_issued Apr. 23, 1996 to_Weatherholt (nasal cannula with face guards);_U.S. Pat. No._5,572,994, issued Nov. 12, 1996 to Smith_(rotatable_coupling in supply tubing); U.S. Pat._No._5,636,