Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3643660 A
Publication typeGrant
Publication dateFeb 22, 1972
Filing dateNov 21, 1969
Priority dateNov 21, 1969
Also published asDE2055506A1
Publication numberUS 3643660 A, US 3643660A, US-A-3643660, US3643660 A, US3643660A
InventorsHavstad Harold R, Hudson Allan C, Kinnear John M
Original AssigneeHudson Allan C, Havstad Harold R, Kinnear John M
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Nasal cannula
US 3643660 A
Abstract
A unified nasal cannula comprises a hollow tubular body having an upper flat or plane surface and a pair of spaced and curved elongated tubular extensions, having exterior orifices for directing a gas flow which extensions project upwardly at an angle from the surface.
Images(1)
Previous page
Next page
Description  (OCR text may contain errors)

United States Hudson et a1.

[ 5] Feb. 22, 1972 [541 NASAL CANNULA [72] lnventors: Allan C. Hudson, 3323 Sparr Boulevard, Glendale, Calif. 91208; John M. Kinnear, 20515 San Gabriel Valley Drive, Walnut, Calif. 91789; Harold R. Havstad, 6612 Centralia, Lakewood, Calif. 90713 [22] Filed: Nov.21, 1969 [21] App1.No.: 878,628

[52] U.S.Cl ..128/206 [51] ..A6lm 15/08 [58] Field of Search ..128/205, 140 N, 198, 199, 200,

[56] References Cited UNITED STATES PATENTS 2,663,297 12/1953 Tumberg ..128/206 2,215,126 9/1940 McMillin ..128/148 2,693,800 11/1954 Caldwell 1 28/206 2,763,263 9/1956 Ellman ...128/ 198 2,868,199 1/1959 Hudson ...128/206 2,931,358 4/1960 Sheridan.... ...128/206 3,161,199 12/1964 Sands ...128/348 3,400,714 9/1968 Sheridan ..128/206 Primary Examiner-Richard A. Gaudet Assistant ExaminerJ. B. Mitchell AttorneyJerry R. Seiler ABSTRACT A unified nasal cannula comprises a hollow tubular body having an upper flat or plane surface and a pair of spaced and curved elongated tubular extensions, having exterior orifices for directing a gas flow which extensions project upwardly at an angle from the surface.

13 Claims, 4 Drawing Figures PATENTEnrmza I972 3; 643 660 f/ g 3 I 'INVENTOR.

NASAL CANNULA BACKGROUND OF THE INVENTION One of the most efficient methods of administering therapeutic oxygen to patients has been accomplished by the use of nasal cannulae. Early cannula models were somewhat cumbersome due not only to their relatively large sizes, but also in the manner by which they were affixed to the patient. For example, devices were attached to the users forehead or utilized strap means which extended around the cheeks to the back of the patients head. With the advent of plastic tubing, a number of improvements were realized, both as to the more efficient oxygen administration, as well as to the patients comfort, for example, as disclosed in US. Pat. Nos. 2,735,432 and 2,868,199. These cannulae are designed so that gases flow directly into the patients nasal passages and pharynx. This object was achieved by tilting a flattened portion of the cannula which lies against the patients face or cheeks, with respect to the plane of the elongated nasal extensions and by curving these extensions in a manner so as to conform with the shape of the nasal passageways.

Notwithstanding such improvements, there remained some disadvantages notably in the area of patient discomfort. The above-noted cannulae, as well as others, in view of their design, generally have been placed on the user so as to be primarily positioned or seated in the nasolabial area, i.e., the area between the patients upper lip and the nostrils. Even though such devices are made of soft, flexible plastic or rubber, in attempts to minimize skin irritation at the points of contact, some discomfort is known to persist. For example, when a patient is required to have prolonged oxygen administration thereby necessitating constant wearing of the cannula, both during awakening as well as sleeping hours, continued contact of the cannula, especially at the philtrum and around the unprotected upper lip and cheek areas causes inflammation and irritation. Not only does the wearer, inadvertently move the cannula while sleeping as the head moves from side to side, but when eating and/or talking, further movement occurs. There is also associated discomfort and inconvenience, particularly in talking or eating where the device is firmly positioned against the upper lip area and across the cheeks. As in the case in any instances of prolonged contact of the patients skin with an object, not only does irritation result, but inflammation and ulcerous conditions may occur after a period of time.

A further disadvantage associated with prior cannulae is in the method in which they are placed on the patient. Where a strap or elastic band is required to be secured around the back of the patients head, the head must be lifted. In cases where the patient suffers from a serious back, head or neck injury, movement of the head is quite undesirable and could cause additional injury. It is to the reduction or elimination of the above-noted disadvantages that the preset invention is directed.

SUMMARY OF THE INVENTION The nasal cannula described herein comprises a body portion having a hollow tunnel or tubular area extending therethrough and which body portion has an upper generally flat surface. A pair of spaced elongated tubular extensions extend from the flat surface. The extensions have an outer orifice for directing a gas flow to the nasal passageways of the patient and a lower interior orifice communicating with the tubular area of the body portion. The termination of the tubular area extending through the body provides an opening at each end, which openings may be connected to an oxygen supply tube. The tubular extensions are preferably curved so that they intersect the flat surface of the body portion at an angle. In use, the cannula when fitted to the patient is positioned so that the flat surface lies across the nostrils (anterior nares) and the approximate center thereof between the spaced tubular extensions rests upon the exterior nasal septum. In this manner, contact of the cannula with the upper lip area is essentially avoided with patient discomfort and .skin irritation minimized. These, as well as other advantages will be described and become more evident from the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 4 illustrates a preferred method by which the cannula is secured to the patient utilizing the oxygen supply tubes.

DETAILED DESCRIPTION OF THE INVENTION Referring to FIGS. 1 and 2, the construction of the nasal cannula 10 includes a body portion 11, having a hollow tunnel 17 through the entire length of the body portion II. Exterior openings 16 of the tunnel 17 are located at each end of the body portion 11. The size or diameter of the tunnel I7 is not particularly critical so long as it is essentially uniform throughout and sufficient to allow for unrestricted passage of gas therethrough. However, the diameter of the tunnel opening 16 should be great enough to allow for insertion of oxygen supply tubes 24 and 25. These supply tubes are preferably of catheter size, for example, having an external diameter of about 0.125 inches. The upper surface 12 of the body portion 11 is flattened so as to provide a smooth surface for contacting the patients nostrils and exterior nasal septum, although it may be slightly outwardly curved. The surface l2 not only provides for patient comfort, but, in addition and of more importance, prevents the cannula from turning or rotating thereby maintaining its proper position during use. Thus, with the flat surface engaging the anterior nares, the cannula does not tend to roll which would otherwise cause the tubular extensions to be displaced from within the nostrils. The rear edge 20 of the upper surface 12 is preferably rounded to provide a smooth surface should it contact the nasolabial area between a patients upper lip and nostrils. This feature is also shown in FIG. 3. The underside of lower surface 18 of the cannula body II as shown is shaped as the exterior diameter of the tunnel 17, but may have alternate form. However, in the interest of being lightweight and flexible, by molding the cannula 10 to have a general shape as shown, material requirements are minimized and simplified molding techniques may be utilized.

Integral with the cannula body I I and protruding or extending from the upper flat surface 12 are a pair of spaced tubular extensions 14. These extensions 14 are desirably curved, as shown, so that when placed within the nasal cavities (Note FIG. 3) they conform to the shape of the passageway as well as providing a smooth surface which may contact the delicate nasal membranes. It will be noted in FIG. 3 that the lower internal orifice 30 of each of the tubular extensions 14 open to the hollow tunnel 17 of the cannula body 11. Then, as oxygen is introduced into the cannula 10 through the oxygen supply tubes 24 and 25, there is an unrestricted passageway for entry of the oxygen through the orifices 30 of each of the tubular extensions 14 which oxygen then passes upward through the tubular extensions 14 and out of the upper external orifices 15. Thus, the oxygen is directly introduced into the patients nasal cavity and pharynx.

As best seen in FIGS. 1 and 3, the tubular extensions 14 intersect with the upper flat surface 12 of the cannula body 1 l at an angle which is preferably obtuse with the plane of the surface 12. The tubular extensions 14 are also preferably located at or near the forward edge of 22 of the surface I2, which location combined with the angle of intersection of the tubular extensions I4 with that surface provide maximum comfort to the patient and easy placement of the cannula extensions 14 into the nasal passageways. Although the extensions 14 may be curved to any desired extent, it has also been found that for most patients having normal nasal passageway contours where the plane of the external gas directing orifices 15 is essentially normal to the plane of the flat surface 12, proper gas flow direction and maximum patient comfort will be achieved. However, the greater or lesser curvatures of these tubular extensions 14 may be utilized depending on individual patient requirements. Yet, clue to the flexibility of these extensions 14 small angle deviation is possible by inserting the cannula extensions into the patients nostrils with concomitant movement of the extensions so as to conform to the patients nasal cavity.

Another preferred feature is in utilizing flared extensions 14. The flaring is preferably uniform between the lower internal orifice 30 and upper exterior orifice 15, resulting in a reduced velocity gas flow from the external orifice 15 as compared to the velocity at which the gas enters the lower orifice 30. Thus, although the same volume of gas will be delivered to the patient, the reduced gas velocity entering the nasal cavity avoids high-velocity impingement on the delicate nasal cavity membrane which could cause oxygen burn, irritation and discomfort. The amount of flaring between the external orifice 15 and the internal orifice 30 may be varied to any desired extent with diameter ratios between about 221 and about 4:l respectively being preferred.

The size of the cannula is not particularly critical with the provision that the length and width of the upper flat surface 12 to be such that it will rest comfortably when placed on the patient. Thus, for example, a length of the surface 12 being between about 1% and about 2 inches will ensure that it will span the width of the nostrils. Further, the width of the flat surface 12, i.e., the distance between the edges 22 and 20 should be sufficient to provide a comfortable contact area with the nostrils and nasal septum, while at the same time, holding the cannula firmly in place when on the patient. However, it should also be understood that this distance should not be excessive which would otherwise cause edge 20 to engage the upper lip area excessively, resulting in discomfort or irritation. In addition, the tubular extensions 14 should be separated or spaced so that they are comfortable and can be easilyinserted into the nasal passages. It will be appreciated that such dimensional requirements will vary between individual patients depending on age, size, facial features, etc. Thus, cannula model sizes may be varied accordingly.

FIG. 4 illustrates a preferred manner in which the cannula is worn by a patient. The cannula l rests across the patients nostril area (anterior nares) and the flexible oxygen supply tubes 24 and 25 are brought across the patients face, over and behind the ears, down the jaw areas and brought together under the chin. A hollow sliding member 28 of sufficient size to encompass both tubes 24 and 25, may then be adjusted so that the cannula will remain firmly in place without the tubes being unduly taunt. The cannula 10 may be easily removed by sliding the member 28 downwardly so that the supply tubes 24 and 25 become loosened. In this manner the cannula can be easily placed on a patient and removed without moving the patients head. The oxygen supply tubes 24 and 25 may be fitted into a larger oxygen supply tube which in turn is connected to an oxygen source as will be understood by those skilled in the art.

The above-described invention provides an oxygen administration device which not only can be easily fitted to and removed from a patient, but which is of minimum discomfort and irritation to the patient. Thus, since the cannula essentially contacts only the exterior nostril area, its presence is realized to the minimum possible extent. Further, the patient may eat, talk, and move his head while the cannula remains firmly, yet comfortably, in place. The fat upper surface which rests comfortably against the patients anterior nares prevents cannula rotation thereby maintaining its proper position with the gas directing tubular extensions located within the nostrils rather than slip ing out even though the supply tubes are rolled or tume somewhat. The cannula also 0 ers the advantage of being simple in design, and in expensive to fabricate. The composition of the cannula is preferably of the thermoplastic composition such as polyvinyl chloride or polyvinyl acetate which materials are understood to be quite pliable or flexible. Alternatively, the cannula may be fabricated from a rubber composition or other flexible synthetic materials. The cannula obviates the requirement of straps or bands thereby also simplifying manufacturing techniques and reducing costs. The unitary device may be produced by a simple molding operation with the oxygen supply tubes then attached prior to or at the time of use.

We claim:

1. A nasal cannula comprising:

an elongated body adapted to have minimal contact with a patients upper lip, said body having a tunnel extending through the length thereof terminating in an oxygen supply opening at each end, the body having a length sufficient to span the width of an average patients nostrils and an upper essentially flat surface portion being relatively thin in cross section for resting against a patient's anterior nares and a pair of spaced hollow tubular extensions'integral with and projecting upwardly from said flat surface which extensions terminate at a gas directing orifice and which hollow portion of said extensions communicate with said tunnel.

2. The cannula of claim 1 wherein the tubular extensions are curved.

3. The cannula of claim 2 wherein the tubular extensions join said flat surface at an obtuse angle.

4. The cannula of claim 1 wherein the hollow portion of each of said extensions communicates with said tunnel at a first orifice and terminates at its opposite end in a gas directing orifice said gas directing orifice being larger than said first orifice.

5. The cannula of claim 4 wherein said hollow portion of said extensions is flared uniformly between said first and said gas directing orifice.

6. The cannula of claim 1 having a flexible oxygen supply tube extending from each tunnel opening.

7. The cannula of claiml composed of a flexible material.

8. The cannula of claim 8 wherein the flexible material comprises a thermoplastic resin.

9. The cannula of claim 8 wherein the resin composition is selected from the group consisting of polyvinyl chloride and polyvinyl acetate. 7

10. The cannula of claim 1 wherein the length of said body is between about 1% and about 2 inches.

11. A nasal cannula for delivering oxygen containing gas comprising:

a. a generally flattened upper body portion having a flat upper surface for resting against a patient's anterior nares said upper surface having a length sufficient to span the width of an average patients nostrils, said body portion being thin in cross section so as to have minimal contact with a patients upper lip,

a hollow tunnel portion of substantially the same length as said upper body portion and attached to the underside "of said upper body portion and tenninating in an oxygen supply opening at each end, and

c. a pair of spaced hollow tubular extensions projecting upwardly from and integral with said flat surface, each end of said extensions communicating with said tunnel at a first orifice and terminating at its opposite end in a gas directing orifice.

12. The cannula of claim 11 wherein the length of said upper body portion is between about 1% and about 2 inches.

13. The cannula of claim 11 having a flexible oxygen supply tube extending from said tunnel ends.

(Hint In I A

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2215126 *Jan 12, 1939Sep 17, 1940John H McmillinNasal pack
US2663297 *Jan 19, 1953Dec 22, 1953Harold G BelascoNasal adapter for oxygen inhalation
US2693800 *Apr 27, 1951Nov 9, 1954Lyle CaldwellNasal cannula
US2763263 *Jun 30, 1953Sep 18, 1956Irving A EllmanAnalgesic apparatus
US2868199 *May 20, 1955Jan 13, 1959Hudson Charles HCannula
US2931358 *Jul 30, 1958Apr 5, 1960Sheridan David SNasal cannulae
US3161199 *Oct 31, 1962Dec 15, 1964Varvel R RobertsonStomach tube holder
US3400714 *May 3, 1965Sep 10, 1968Brunswick CorpNasal cannula
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3726275 *Dec 14, 1971Apr 10, 1973Jackson INasal cannulae
US3799164 *Aug 12, 1971Mar 26, 1974Du PontAnalgesic apparatus
US3802431 *Oct 8, 1971Apr 9, 1974Bard Inc C RNasal cannula
US4120300 *Nov 29, 1976Oct 17, 1978City Of Hope National Medical CenterBreathing apparatus
US4790308 *Apr 4, 1984Dec 13, 1988Sherwood Medical CompanyNasal cannula harness
US5513634 *May 6, 1994May 7, 1996Chek-Med Systems, Inc.Combination integral bite block airway and nasal cannula
US5636630 *Jul 25, 1996Jun 10, 1997Miller; Wallace T.Respiratory device and method therefor
US6533983 *Jan 4, 2001Mar 18, 2003Salter LabsMethod to produce nasal and oral cannula apnea detection devices
US6533984 *Jun 18, 2001Mar 18, 2003Salter LabsMethod to produce nasal and oral cannula breathing detection devices
US6763832Apr 27, 2000Jul 20, 2004Loma Linda University Medical CenterDevice and method for the administration of oxygen
US6830445Oct 4, 2002Dec 14, 2004Salter LabsNasal and oral cannula breathing detection devices
US7017576Aug 22, 2003Mar 28, 2006Fisher & Paykel Healthcare LimitedBreathing assistance apparatus
US7080645 *Jul 21, 2003Jul 25, 2006Seleon GmbhAnti-snoring device, method for reducing snoring, and a nasal air cannula
US7096867Oct 25, 2002Aug 29, 2006Fisher & Paykel Healthcare LimitedNasal masks
US7337780Jun 4, 2004Mar 4, 2008Salter LabsNasal and oral cannula breathing detection device
US7364682Dec 5, 2003Apr 29, 2008Salter LabsNasal and oral cannula breathing detection device
US7448594Oct 21, 2005Nov 11, 2008Ameriflo, Inc.Fluid regulator
US7565907Jun 17, 2005Jul 28, 2009Salter LabsNasal and oral cannula having two capabilities and method of producing same
US7614401Aug 6, 2003Nov 10, 2009Paul S. ThompsonNasal cannula assembly
US7617826Mar 19, 2007Nov 17, 2009Ameriflo, Inc.Conserver
US7640932Jun 17, 2005Jan 5, 2010Salter LabsNasal cannula for acquiring breathing information
US7743770Nov 10, 2005Jun 29, 2010Salter LabsNasal and oral cannula having three or more capabilities and method of producing same
US7832400Dec 13, 2004Nov 16, 2010Salter LabsNasal and oral cannula having two capabilities and method of producing same
US7874293Feb 20, 2004Jan 25, 2011Resmed LimitedNasal assembly
US7900635Dec 8, 2008Mar 8, 2011Resmed LimitedNasal assembly
US7905232Sep 13, 2002Mar 15, 2011Fisher & Paykel Healthcare LimitedBreathing assistance apparatus
US7946288Nov 10, 2006May 24, 2011Encompas Unlimited, Inc.Bite block system and method
US8042546Dec 20, 2007Oct 25, 2011Resmed LimitedNasal assembly
US8136527Mar 13, 2008Mar 20, 2012Breathe Technologies, Inc.Method and device for non-invasive ventilation with nasal interface
US8146592Feb 28, 2005Apr 3, 2012Ameriflo, Inc.Method and apparatus for regulating fluid flow or conserving fluid flow
US8186352Dec 19, 2007May 29, 2012Resmed LimitedNasal assembly
US8230859Oct 26, 2009Jul 31, 2012Ameriflo, Inc.Method and apparatus for regulating fluid
US8286636Jan 4, 2008Oct 16, 2012Resmed LimitedNasal assembly
US8312881Dec 27, 2007Nov 20, 2012Resmed LimitedNasal assembly
US8312883Dec 31, 2007Nov 20, 2012Resmed LimitedNasal assembly
US8381729Aug 3, 2007Feb 26, 2013Breathe Technologies, Inc.Methods and devices for minimally invasive respiratory support
US8418694Apr 30, 2010Apr 16, 2013Breathe Technologies, Inc.Systems, methods and apparatus for respiratory support of a patient
US8424530Mar 7, 2011Apr 23, 2013Resmed LimitedNasal assembly
US8567399Sep 26, 2008Oct 29, 2013Breathe Technologies, Inc.Methods and devices for providing inspiratory and expiratory flow relief during ventilation therapy
US8573219Dec 9, 2011Nov 5, 2013Breathe Technologies, Inc.Method and device for non-invasive ventilation with nasal interface
US8631799Jan 23, 2009Jan 21, 2014Salter LabsRespiratory therapy system including a nasal cannula assembly
US8677999Aug 21, 2009Mar 25, 2014Breathe Technologies, Inc.Methods and devices for providing mechanical ventilation with an open airway interface
US8770193Apr 17, 2009Jul 8, 2014Breathe Technologies, Inc.Methods and devices for sensing respiration and controlling ventilator functions
US8776793Apr 17, 2009Jul 15, 2014Breathe Technologies, Inc.Methods and devices for sensing respiration and controlling ventilator functions
EP0153132A1 *Feb 12, 1985Aug 28, 1985Victoria Anne ForrestSurgical device for maintaining airways in the nasal passages
Classifications
U.S. Classification128/207.18
International ClassificationA61M25/02, A61M16/06
Cooperative ClassificationA61M16/0666, A61M2025/0226, A61M25/02
European ClassificationA61M25/02, A61M16/06L