U.S. patent number 3,598,113 [Application Number 04/766,157] was granted by the patent office on 1971-08-10 for disposable laryngoscope construction.
This patent grant is currently assigned to Welch Allyn, Inc.. Invention is credited to William C. Moore, William S. Pilgrim.
United States Patent |
3,598,113 |
Moore , et al. |
August 10, 1971 |
DISPOSABLE LARYNGOSCOPE CONSTRUCTION
Abstract
A disposable laryngoscope having a unitary plastic blade and
handle. The handle is hollow and in use contains a light unit
having batteries, a lamp and an operating switch. The light unit is
not disposable and is removed for reuse before the blade and handle
assembly is thrown away. The disposable part of the instrument
includes a fiber optic bundle which carries light from the lamp
within the handle to a point near the distal end of the blade.
Inventors: |
Moore; William C. (Skaneateles,
NY), Pilgrim; William S. (Port Byron, NY) |
Assignee: |
Welch Allyn, Inc. (Skaneatiles
Falls, NY)
|
Family
ID: |
25075578 |
Appl.
No.: |
04/766,157 |
Filed: |
October 9, 1968 |
Current U.S.
Class: |
600/199; 385/117;
600/185 |
Current CPC
Class: |
A61B
1/00103 (20130101); A61B 1/07 (20130101); A61B
1/267 (20130101) |
Current International
Class: |
A61B
1/267 (20060101); A61b 001/26 (); A61b 001/06 ();
A61b 001/24 () |
Field of
Search: |
;128/6,10,11,16,23,9,13,18,22,7,8,395,396,397,398
;240/1EI,2.18,2M |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Gaudet; Richard A.
Assistant Examiner: Pace; Channing L.
Claims
What we claim is:
1. In combination with a nondisposable light unit having a power
source, lamp and operating switch: a disposable laryngoscope
comprising a hollow elongated handle, a blade integrally connected
to one end of the handle, and extending therefrom in substantially
right angular relationship and of such length as to extend into a
larynx being examined, said handle being open at its opposite end,
the handle and blade being of a unitary plastic construction, the
light unit being fully enclosed with a free sliding fit in the
handle, a closure member threaded on the open end of the handle to
releasably hold the light unit therein, the closure member coacting
with the light unit switch whereby rotation of the former actuates
the latter, and a bundle of light transmitting clad optical fibers
extending from a point inside the handle adjacent the light unit
lamp to a point spaced therefrom near the distal end of the
blade.
2. An instrument as defined in claim 1 wherein said blade includes
a flange a portion of which overlies the optical fiber bundle.
Description
BACKGROUND OF THE INVENTION
This invention relates generally to medical instruments, and has
particular reference to a disposable laryngoscope having a novel
construction.
A laryngoscope, like any other instrument that enters a body
cavity, must be sterilized after each use. This is usually
accomplished by autoclaving and this operation has become
increasingly expensive due to ever-increasing labor costs. Thus,
autoclaving requires that a nurse, technician or other attendant
pick up the instrument after use by the doctor, take it to the
autoclave, perhaps give it a preliminary cleaning or washing, place
the instrument in the autoclave and then after an interval take it
out again, etc. Obviously, if the autoclave itself must be started
up and turned off after each use, the operation takes even more
time. In short, sterilizing an instrument has become so expensive
that whenever an instrument can be produced cheaply enough it is
more economical to use a new one each time than to sterilize to
permit reuse.
In addition to the expense and bother of having to continually
autoclave the relatively costly, permanent type of laryngoscope,
most of these instruments in common use employ as a light source a
lamp that is located near the distal end of the blade. This has the
advantage of placing the light source close to the area being
examined or treated, but is disadvantageous in that having a lamp
in the patient's mouth is undesirable because of heat and the
possibility of breakage. Also, locating the lamp at or near the
distal end of the laryngoscope blade limits the size of the lamp
that can be used and thus the amount of light output.
SUMMARY OF THE INVENTION
The laryngoscope of the present invention is comprised of two
principal parts: a blade and handle unit that is disposable and a
light unit that is not. The blade and handle are preferably made of
plastic. The handle is hollow and is adapted to receive with a free
sliding fit the light unit which is not unlike a penlight and
comprises a lamp, batteries and an operating switch in a
cylindrical case.
The light unit is releasably held in the laryngoscope handle by a
screwcap that engages the handle open end and can be turned to
operate the light unit switch. A preformed bundle of light
transmitting optical fibers is carried by the blade and handle unit
to conduct light from the light unit lamp within the handle to a
point near the distal end of the blade.
Because of its molded plastic construction, the blade and handle
unit of the laryngoscope can be manufactured quite inexpensively
and, therefore, after use the light unit is removed and the
remainder of the instrument is simply thrown away obviating the
expense and inconvenience of autoclaving. In addition to being
relatively inexpensive, the plastic blade is less likely to be
injurious to the patient's teeth than a metal blade. The fiber
bundle eliminates the heat problem caused by a lamp at the distal
end of a blade and is, of course, far safer. The fiber bundle also
permits a larger lamp to be used since the lamp is in the handle
rather than on the blade, and the available light can be used more
efficiently.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front elevation of a disposable laryngoscope embodying
the invention;
FIG. 2 is a top plan view thereof;
FIG. 3 is a fragmentary right side elevation thereof;
FIG. 4 is a fragmentary rear elevation thereof;
FIG. 5 is a partial longitudinal sectional view of the laryngoscope
taken on line 5-5 of FIG. 2;
FIG. 6 is an enlarged elevation of the light unit for the
laryngoscope;
FIG. 7 is a transverse sectional view taken on line 7-7 of FIG.
1;
FIG. 8 is a transverse sectional view taken on line 8-8 of FIG.
1;
FIG. 9 is a fragmentary front elevation of a modified form of the
disposable laryngoscope; and
FIG. 10 is a transverse sectional view taken on line 10-10 of FIG.
9.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings, wherein like reference numbers
designate the same part in each of the views, 10 generally
indicates the blade and handle unit of the laryngoscope of the
invention. This unit comprises a blade 11 and a tubular handle 12
that are integrally connected to provide a one piece or unitary
structure. In the embodiment disclosed, the blade and handle are
molded of a suitable plastic material.
The blade 11 is connected to the closed end 14 of the handle and
includes a spatula portion 15, a flange portion 16 and a rounded
tip 17. The longitudinal axis of the spatula is curved adjacent the
handle and then has a substantially straight portion 18 extending
to the tip. The flange 16 is connected to one side edge of the
spatula and is disposed at right angles to the transverse axis
thereof. A subflange 20 is formed on the outer edge of the flange
16, the transverse axis of the subflange being substantially
perpendicular to the plane of flange 16 and parallel to the
transverse axis of the spatula.
The end of handle 12 opposite the blade is open, and a closure is
provided in the form of a cap 21 that is adapted to be threaded
onto the handle. A battery pack--lamp unit, generally indicated at
22 in FIG. 6, is insertable with a sliding fit in the hollow
handle, the unit being maintained in the handle by the cap 21. The
battery pack--lamp unit, also referred to herein as simply the
light unit, comprises a cylindrical metal casing 24, a lamp 25, a
pushbutton switch 26 and batteries (not shown) that are contained
withing the housing.
The light unit 22 is constructed and operates essentially like a
flashlight or penlight and is not considered to be novel per se.
The operating switch 26 is normally spring biased outwardly into an
open circuit position. When the switch is pushed inwardly, a
circuit is completed through the batteries, lamp, casing, switch
and back to the batteries. When the light unit is mounted in the
instrument handle, the switch 26 can be actuated to turn the lamp
on or off by turning the cap 21 a few degrees in either
direction.
When the light unit is inserted in the handle 12, a shoulder 27 on
the unit abuts against a shoulder 28 in the handle interior and the
lamp 25 is received in a reduced diameter portion 30 of the
interior. Light from the lamp is conducted from within the handle
to a point near the distal or tip end of the blade by means of a
bundle 31 of optical fibers or filaments, the fibers being of a
known clad glass or plastic type. Fiber bundle 31 may be preformed
by securing the fibers together in the configuration shown in FIG.
1, and the opposite ends of the bundles may be optically ground and
polished.
One end of the fiber bundle is substantially cylindrical and is
received in a cylindrical opening 32 in the closed end of the
instrument handle, the opening communicating with the portion 30 of
the handle interior so that the bundle receives substantially all
of the light that emanates from the light unit lamp 25. The
opposite end of the bundle has an oval or rectangular cross section
so that it offers a minimum amount of interference to viewing or
instrumentation. This end of the bundle terminates at a point
between the midlength point of the blade and its distal end and is
held in position by small lugs 34, FIGS. 1 and 8, integral with the
blade. As indicated in FIG. 3, above the opening 32 at the closed
end of the handle the bundle bends toward the blade flange 16 so
that from that point to its distal end substantially all of the
bundle is positioned beneath and protected by the subflange 20.
To use the laryngoscope, the light unit 22 is inserted in the
handle and cap 21 is engaged with the open end and turned far
enough to depress the switch 26 and light the lamp 25. The light
from the lamp is transmitted by the fiber bundle 31 with negligible
light loss to its distal end from which the light emerges and
illuminates the field being examined and/or treated. After use, the
light unit is removed from the handle and put aside and the blade
and handle unit, including its fiber bundle, is thrown away.
The light unit, which is not disposable, need not be sterilized
because it has been completely enclosed by the handle and has had
no contact with the patient. Thus, the need for sterilization of
any kind has been eliminated. Moreover, since the blade and handle
unit is used but once, its sterile condition can be assured by
shipping it from the manufacturer in such condition wrapped in a
sealed package. The plastic blade of the disposable laryngoscope of
the invention is less likely to be injurious to the patient's teeth
than a metal blade and, as noted above, the fiber bundle
arrangement eliminates the need to locate the lamp at the distal
end of the blade which is dangerous and produces heat. It was also
pointed out that the fiber bundle permits the use of a larger lamp
than can be used by most conventional laryngoscopes. While only one
blade shape has been disclosed, it will be apparent that the blade
and handle unit can be produced with a variety of blade shapes and
sizes for different specific uses of the instrument.
FIGS. 9 and 10 illustrate a slightly modified form of the invention
wherein the blade includes a wall 35 that is parallel to the flange
16' and spaced therefrom to provide an enclosure for the fiber
bundle 31'. With this arrangement, the only part of the bundle that
is exposed is the light emitting distal end indicated at 36 in FIG.
9.
From the foregoing description it will be apparent that the
invention provides a novel and highly useful laryngoscope
construction which ensures maximum cleanliness and is economical
and convenient to use. As will be understood by those familiar with
the art, the invention may be embodied in other specific forms
without departing from the spirit or essential characteristics
thereof. The embodiments disclosed are, therefore, to be considered
in all respects as illustrative rather than restrictive, the scope
of the invention being indicated by the appended claims.
* * * * *