U.S. patent number 3,762,400 [Application Number 05/192,390] was granted by the patent office on 1973-10-02 for medical examining instrument.
Invention is credited to Bernard McDonald.
United States Patent |
3,762,400 |
McDonald |
October 2, 1973 |
MEDICAL EXAMINING INSTRUMENT
Abstract
A device for viewing the cervix and vaginal segment of a human
uterus has a plurality of blades removably mounted on a holder. The
blades are elongated transparent members and have an internal
cavity closed near one end of the blade and open at the opposite
end. The cavity is relatively wider in one direction and relatively
narrower in another direction with the walls adjacent the narrower
sides relatively weaker than the walls adjacent the wider
sides.
Inventors: |
McDonald; Bernard (Malibu,
CA) |
Family
ID: |
22709446 |
Appl.
No.: |
05/192,390 |
Filed: |
October 26, 1971 |
Current U.S.
Class: |
600/212; 600/213;
600/223 |
Current CPC
Class: |
A61M
29/02 (20130101); A61B 1/00142 (20130101); A61B
1/32 (20130101); A61B 1/07 (20130101) |
Current International
Class: |
A61M
29/00 (20060101); A61B 1/00 (20060101); A61B
1/32 (20060101); A61b 001/06 () |
Field of
Search: |
;128/6-18 |
References Cited
[Referenced By]
U.S. Patent Documents
Other References
Medical & Surgical Review - February, 1970, page 35..
|
Primary Examiner: Laudenslager; Lucie H.
Claims
I claim:
1. A body cavity speculum blade comprising;
an elongated transparent plastic member including an internal
cavity closed nearer one end of said blade and open at the opposite
end;
said blade cavity being relatively wider in one direction and
relatively narrower in another direction transverse to the length
of said blade such that the walls adjacent the narrower sides are
relatively weaker than the walls adjacent the wider sides.
2. A body cavity speculum blade as defined in claim 1 wherein the
end of said blade having the closed end of said internal cavity,
has a curved portion for use within the body cavity and the closed
end of said blade cavity is curved to conform to said curved blade
portion.
3. A body cavity speculum blade as defined in claim 1 wherein said
blade is curved and said blade cavity is similarly curved for use
of said blade within the body cavity.
4. A body cavity speculum blade comprising;
an elongated body;
connecting means on one end of said body for temporarily connecting
said blade to a speculum;
means on the other end of said body for engaging a body portion
within the body cavity and applying a force thereto in a direction
along the length of said blade; and
said connecting means further comprising a breakaway body portion
for releasing said connecting means.
5. A body cavity speculum blade as defined in claim 4 wherein said
connecting means comprises an internal cavity closed nearer one end
of said elongated body and open at the opposite end.
6. A body cavity speculum blade as defined in claim 4 wherein said
body is formed of a transparent material and wherein said blade is
curved and said blade cavity is similarly curved for use of said
blade within the body cavity.
Description
In my co-pending application, Ser. No. 144,468, filed on May 18,
1971, there is disclosed a combined vaginal speculum and teculum
instrument which is comprised of a handle, a hollow housing and a
plurality of blades releasable secured to the housing and adapted
to hold in spaced apart relationship the vaginal walls of a patient
during a medical examination and additionally, securely engaging
and grasping the outside of the cervix adjacent the cervico-vaginal
fornix. This invention is concerned with providing an improved
blade which has a frangible portion for manual breakage thereof
after an examination or medical treatment, etc.
It is therefore a principal object of the present invention to
provide an improved body cavity speculum blade.
It is a further object of the present invention to provide a body
cavity speculum blade having frangible means for manual breakage
thereof from an instrument after use.
These and other objects and many of the attendant advantages of
this invention will be readily appreciated as the same becomes
understood by reference to the following detailed description when
considered in connection with the accompanying drawings in
which:
FIG. 1 is a perspective view of a body cavity instrument with the
novel blades;
FIG. 2 is a cross sectional view of the blade taken along line 2--2
of FIG. 1.
Referring now to the drawings wherein like reference characters
designate like or corresponding parts throughout, there is
illustrated in FIGS. 1 and 2 an instrument having a pair of handle
elements 401 and 402 which are pivotally interconnected by a pin
403. The forward handle 402 is rigidly connected to a lower blade
support bracket 404. The rearward handle 401 is adjustably
connected to an upper support bracket 406 by a thumb screw 407 to
permit adjustment as hereinabove described.
A rectangular, tapered tang 408 extends forwardly from the upper
support bracket 406. At least one surface of the tang 408 is
provided with tooth-like ridges 409 having a shallow angle ramp on
a forward edge and a steep ramp on the rearward edge.
Exploded from the upper tang 408 in FIG. 1 is an upper blade 411
made of a transparent plastic material. Since the blade 411 is
transparent an internal cavity 412 can be seen therein and is
further seen in the cutaway section of the blade. The internal
cavity is blind or closed towards the forward end of the blade 411
and has an open mouth 413 at its rearward end. As illustrated in
this embodiment the blade near the mouth 413 is rectangular and so
is the mouth of the cavity. The forward end of the blade is curved
for use of the instrument within the body and it is therefore
preferable that the forward end of the cavity also be curved to
conform as is also seen in FIG. 2 which comprises a cross-section
of a lower blade 414. If desired, the rearward portion of the blade
and the mouth 413 can also be made with a curved profile and if
this is done the tang 408 is also made curved to be complementary
to the cavity 412.
When the blade 411 is placed on the rest of the instrument the
mouth 413 of the cavity is slid over the tang 408 and across the
ridges 409. Since the ridges are somewhat like teeth, they firmly
engage the plastic blade to prevent it from being removed under the
forces normally encountered in a body examination. A particular
advantage of the instrument is that the blades are inexpensive and
disposable thereby eliminating any need for sterilization between
uses. Since the ridges 409 hold the blades in place firmly, other
means are provided for removing the blade from the tang 408. Thus
as seen in the cross-section of FIG. 2, the two broader sides 416
of the blade are made relatively thick for strength and rigidity.
The narrower side edges 417 are made relatively thin so as to be
readily broken by hand. Thus, when one has completed use of the
instrument is is only necessary to push the blade 411 to one side
relative to the tang 408 whereupon one or both of the thinner sides
417 breaks away letting the blade drop from the instrument.
The lower blade 414 and upper blade 411 are preferably identical
for ease in manufacture. A slight modification is also shown in
FIG. 1 on the lower tang 418 forming a part of the lower blade
support bracket 404. Instead of ridges as provided on the upper
tang 408 a plurality of small nibs 419 protrude outwardly from the
tang in order to engage the plastic blade and prevent its
withdrawal from the end of the tang. Preferably the nibs 419 are
asymmetrical somewhat like the teeth on a rasp to permit the blade
to be inserted readily by hand and yet to inhibit withdrawal of the
blade.
Protruding forwardly from the tangs 408 and 418 are similar fiber
optic bundles 421. Preferably as seen in FIG. 2 the fiber optic
bundle is surrounded by a relatively rigid, yet elastically
flexible plastic sleeve 422. The sleeve serves to protect the fiber
optic bundle from damage when a blade 411 or 414 is removed from
the instrument since it can elastically deform to some extent. The
cavity 412 within the blade is preferably kept relatively wide in
the region surrounding the fiber optic bundle to permit it to be
twisted to the side to break away the thin walls 417 without unduly
encountering the fiber optic bundle.
The fiber optic bundle 421 has an end 423 within the hollow portion
of the rear handle 401. This end is adjacent a high intensity light
bulb 424 electrically connected to dry cell batteries 426 in a
conventional manner. A switch (not shown) is provided near the
upper portion of the rear handle 401 for easy thumb operation. The
fiber optic bundle passes upwardly adjacent the handle 401 and
forks into two bundles adjacent the blade support brackets and then
the two forks pass through the center of the respective blade
mounting tangs 408 and 418. The forward end 427 of each of the
fiber optic bundles is preferably slightly curved relatively
inwardly and cut off at a slight angle so that light from the bulb
424 passes through the bundle and is projected from the end 427
somewhat inwardly in a forwardly converging direction. Some of the
light is transmitted directly through the transparent blades
adjacent the end of the cavity therein and a portion is transmitted
along the length of the blades to provide adequate illumination
when the instrument is used.
The use of a hollow blade that fits on an extending member in the
manner of a mortise and tenon is advantageous for ease of use and
also for accommodation of fiber optics or similar lighting sources.
The hollow disposable transparent plastic blade permits the
lighting to be directed as desired by permanent fiber optics. If
desired the tang may be appreciably longer and the fiber optics
have only an end exposed for illumination. In such an embodiment a
more flexible blade may be used with more rigidity contributed by
the tang. Such a long blade may be put on the tang in the manner of
a sock or glove and may be removed by tearing away a deliberately
weakened section. A strong string or wire may be embedded in the
plastic to aid in cutting away the plastic.
Although limited examples of medical examining instruments have
been described and illustrated herein many modifications and
variations will be apparent to one skilled in the art. It is
therefore to be understood that within the scope of the appended
claims the invention may be practiced otherwise than as
specifically described.
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