U.S. patent number 3,867,946 [Application Number 05/410,960] was granted by the patent office on 1975-02-25 for binasopharyngeal airway.
Invention is credited to Robert A. Huddy.
United States Patent |
3,867,946 |
Huddy |
February 25, 1975 |
BINASOPHARYNGEAL AIRWAY
Abstract
An elastomeric nasopharyngeal airway comprising a tubular
portion open at one end for receiving a gas supply device and two
nasopharyngeal tube sections connected at the opposite end for
insertion through the nose and nasopharynx. The tube sections each
have diametrically opposed internal ridges which engage each other
upon bending of the tube sections to prevent complete collapse
which might otherwise obstruct or restrict passage of gas through
the tube sections. Tip formations on the tube sections divert the
gas streams to impinge on each other and thus reduce direct
impingement of the gas streams on the surrounding portions of the
patient's tissues.
Inventors: |
Huddy; Robert A. (Arcadia,
CA) |
Family
ID: |
23626976 |
Appl.
No.: |
05/410,960 |
Filed: |
October 29, 1973 |
Current U.S.
Class: |
128/207.18 |
Current CPC
Class: |
A61M
31/00 (20130101); A61M 16/0666 (20130101); A61M
16/0461 (20130101); A61M 25/0023 (20130101) |
Current International
Class: |
A61M
25/00 (20060101); A61M 16/06 (20060101); A61M
31/00 (20060101); A61m 031/00 () |
Field of
Search: |
;128/2C,2M,14N,145.5,146.6,184,188,198,200,206,213,240,250,342,348,349,350 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Gaudet; Richard A.
Assistant Examiner: Opitz; Rick
Attorney, Agent or Firm: Schwend; Fred N.
Claims
I claim:
1. A pharyngeal airway comprising
a one-piece tubular member of elastomeric material,
said member having a tubular portion open at one end to receive a
gas supply device, and
a pair of spaced nasopharyngeal tube sections communicating with
said tubular portion at the opposite end of said tubular
portion,
the ends of said tubular sections remote from said tubular portion
being inclined oppositely to each other, and
the passages of said tube sections adjacent the apices of said
inclined ends curving inwardly toward each other whereby to deflect
the respective gas streams into impingement with each other.
Description
Background Of The Invention
This invention relates to means for introducing an anesthesia gas
or the like by the use of a nasopharyngeal airway and has
particular reference to a nasopharyngeal tube insertable through
the nasopharynx.
Flexible nasopharyngeal tubes of the above type have been used
heretofore. However, those of which I am aware, comprise a single
tube or tubes insertable through the nose, the nasopharynx and into
the trachea. In cases where two tubes have been used, special
manifold means or separate gas supply means must be supplied for
both tubes. Also, because of the curvature of the nasal passages
and the fact that the tubes must be bent to connect the same to the
gas supply devices in different manners, there exists the
possibility of sharply bending or kinking the tubes and thus
cutting off or severly restricting the flow of anesthesia gas
therethrough.
SUMMARY OF THE INVENTION
According to my present invention, a one piece nasopharyngeal
airway is provided of relatively soft elastomeric material
comprising a tubular portion open at one end to receive a gas
supply device and connected at its opposite end to two divergent
nasopharyngeal tube sections of equal length. The tube sections are
formed with inwardly extending ridges which stiffen the tube
sections against sharp bends and which also engage each other in
the event the tube sections are sharply bent so as to maintain open
communication through such bent portions.
Further, the ends of the tube sections terminate in tips which
deflect the two gas streams into impingement with each other to
dissipate the force of such streams so that they will not directly
strike against the surrounding tissue of the pharynx which might
otherwise cause irritation.
The above and other features of the invention will be more readily
understood on reference to the following specification when read in
conjunction with the accompanying drawings wherein:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic sagital section of the head and upper neck
showing especially the nasopharyngeal airway embodying a preferred
form of the present invention and showing the same inserted through
a patient's nose and nasopharynx and permitting the distal tips of
the tube sections to lie in the pharynx.
FIG. 2 is a front view of the airway.
FIG. 3 is an enlarged sectional plan view of one of the
nasopharyngeal tube sections and is taken along the line 3--3 of
FIG. 2.
FIG. 4 is a sectional view similar to FIG. 3 but showing the tube
section in a condition which exists as a result of an excessive
sharp bend.
FIG. 5 is an enlarged sectional view of the tip of one of the tube
sections.
FIG. 6 is a sectional plan view of a modified form of the invention
and is taken in the same direction as is FIG. 3.
Referring to the drawings, a binasopharyngeal airway according to
the present invention is illustrated generally at 11 and is formed
of a single piece of molded latex or other relatively soft
elastomeric material. The airway comprises a main tubular portion
12 having an internal diameter sufficient to receive a standard
endotracheal male connector of either the straight type as
indicated by the dot-dash lines 14 or the 90.degree. type as shown
by dot-dash lines 15, the latter being connected to a suitable gas
supply through tubing 19. The tubular portion 12 communicates at
its lower end with two spaced and parallel nasopharyngeal tube
sections 16 and 17 of equal length and of sufficient length to be
passed into the patient's pharynx.
Each tube section terminates at its lower end in a tip 18 (see also
FIG. 5) for diverting the gas stream passing through the tube
section at an angle to the length of such section. For this
purpose, the tip 18 is formed with an inclined open end 20 and the
portion of the tube section adjacent the apex of such inclined end
is curved as shown at 21 to deflect the gas stream inwardly and
generally in the other tip. Therefore, when gas is forced through
the airway, the two divergent gas streams passing through the tube
sections 16 and 17 impinge on each other and are the dispersed
within the pharynx. The curved portion 21 also results in a
relatively blunt leading end to facilitate insertion of the tube
sections through the nasal passages, etc.
As is well known, in certain types of operations, it is desirable
that the gas supply be located beyond the patient's head, in which
case it is desirable to use a 90.degree.connector, i.e., 15,
whereas in other types of operations it is desirable that the gas
inlet be located adjacent the patient's body in which case a
straight connector, i.e., 14, is preferably used to reduce bending
of the nasopharyngeal tube. Nevertheless, some amount of bending of
the tube sections 16 and 17 will occur and because of the soft,
pliant nature of the tube sections there is a possibility that they
may be accidentally sharply bent which might otherwise greatly
restrict the passage of gas therethrough. In order to prevent
complete collapse of the tube sections, I preform the latter with
diametrically opposed inwardly extending ridges 22 and 23,
preferably extending along the length of the upper end portions of
the tube sections 16 and 17. Such ridges 22 and 23 are located in a
plane passing through the center of the respective tube sections,
which plane extends at right angles to a plane passing through the
centers of both tube sections. Such ridges 22 and 23 not only
stiffen the tube sections against bending but also, when such tube
sections are bent sharply, engage each other as shown in FIG. 4 to
prevent complete collapse, leaving diametrically opposite conduit
sections 24 and 25 as shown in FIG. 4.
DESCRIPTION OF THE MODIFIED EMBODIMENT
FIG. 6 illustrates the modified form of the invention in which each
tube section is formed with a circular outer circumference but is
thickened at diametrically opposite points to form inwardly
extending ridges 26 and 27 which perform the same function as the
ridges 22 and 23.
* * * * *