U.S. patent number 3,858,005 [Application Number 05/416,024] was granted by the patent office on 1974-12-31 for stethoscope with display.
Invention is credited to Robert A. Marshall, Theodore E. Spielburg.
United States Patent |
3,858,005 |
Marshall , et al. |
December 31, 1974 |
STETHOSCOPE WITH DISPLAY
Abstract
An improved stethoscope incorporating in addition to
conventional cardiac vibration pick up and transmission,
miniaturized electronic pick up and display on a cathode ray tube
mounted on the back of a chest piece, or attached to the tubing of
the stethoscope.
Inventors: |
Marshall; Robert A. (Cambridge,
MA), Spielburg; Theodore E. (Wellesley, MA) |
Family
ID: |
23648209 |
Appl.
No.: |
05/416,024 |
Filed: |
November 15, 1973 |
Current U.S.
Class: |
600/528;
381/67 |
Current CPC
Class: |
A61B
7/04 (20130101); G01R 13/20 (20130101) |
Current International
Class: |
A61B
7/00 (20060101); A61B 7/04 (20060101); G01R
13/20 (20060101); A61b 007/02 () |
Field of
Search: |
;179/1ST ;128/2.5S |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
1,215,299 |
|
Apr 1966 |
|
DT |
|
871,595 |
|
Jun 1961 |
|
GB |
|
Primary Examiner: Cooper; William C.
Attorney, Agent or Firm: Cohen; Lawrence S.
Claims
We claim:
1. An improved stethoscope comprising:
a. a chest piece having a body containing:
1. a pick up section;
2. an amplifier section; and
3. a display section;
in which the pick up section comprises a diaphragm or bell mounted
on the body and adapted to pick up the vibration of heart or other
bodily sounds and a transmission space containing a vibration
transmitting medium and means to pick up the vibration of heart
sounds and convert them to an electrical signal and transmit them
to the amplifier section; and
in which the amplifier section is spaced from the diaphragm or bell
and comprises miniaturized circuitry adapted to receive the
transmissions from the pick up section, amplify and transmit
signals to the display section; and
in which the display section comprises a miniaturized cathode ray
tube for receiving and displaying a signal from the amplifier
section, the display section being located on the stethoscope
proximate to the body;
b. a tube assembly comprising a hollow tube communicating with the
transmission space and dividing to form a pair of tubes adapted to
reach the ears of the stethoscope user and to transmit the
vibration of heart or other bodily sounds.
c. an integral power source for operating the amplifier and the
cathode ray tube.
Description
BACKGROUND OF THE INVENTION
This invention relates to stethoscopes and particularly to a
stethoscope having electronic display capability as well as
conventional listening capability. The stethoscope is an old and
well known instrument used by physicians for listening to the heart
and other areas of the body. It generally serves as a pick up and
transmittance means, through air, of the sounds from the subject's
body to the physician's ears. The pick up is accomplished usually
by a diaphragm or a bell which picks up vibrations and itself
vibrates, which vibrations are transmitted through tubes to the
ears of the listener. The interpretation of the sounds is sometimes
difficult, takes a great deal of skill, and may be debatable among
various physicians.
Therefore, some electronic means have been devised to detect and
record cardiac sounds in a more objective manner. However, none has
enabled the use of a small, portable device like the conventional
stethoscope. Such electronic means, called phonocardiograph
machines, are usually very large, requiring the patient to be
brought to a special location. Others utilize special pick up means
which are attached to the patient's body and are adapted to the
recording device. The audible output, if available, is always
electronically amplified and not nautral.
The present invention is an improvement on the conventional
stethoscope retaining its portability and conventional, manual use
while providing an electronic display capability so as to be able
to see simultaneously the oscilloscopic representations of the
unamplified sounds one is hearing.
SUMMARY OF THE INVENTION
The invention is an improved stethoscope having a diaphragm or bell
pick up, communicating with a divided tubing for transmitting heart
sounds to a listener's ears and also including means to pick up and
convert heart or other bodily sounds to an electrical signal; a
miniaturized amplifier mounted to receive the signal and a small
cathode ray tube receiving the output of the amplifier to display
for example, the heart sounds, as in a phonocardiograph.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front view of a preferred embodiment of the stethoscope
of the invention, partially broken away.
FIG. 2 is a cross sectional side view of the chest piece of this
invention.
FIG. 3 is a rear view of the chest piece.
FIG. 4 is a side view of the power supply section.
FIG. 5 is a top view of the power supply.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The improved stethoscope is seen in FIGS. 1 and 2 as having a chest
piece 1 and a tube assembly 2 and a power source 3.
The chest piece as shown in further detail in FIGS. 2 and 3 has a
pick up section comprising a housing 4a diaphragm or bell 5 and a
transmission space 6. Mounted on the diaphragm or bell are crystal
sound pick ups 7 in this preferred embodiment. A carbon
particle-type microphone might also be used.
The pick ups 7 are present in such number and at such points on the
diaphragm as may be determined by conventional experimentation to
provide the best results. From the crystal pick ups 7, three being
shown, wires 8 lead to a miniaturized amplifier 9 diagrammatically
shown as being mounted on a printed circuit board. The amplifier is
connected to a miniaturized cathode ray tube 10 diagrammatically
illustrated, having its tube face 11 facing outwardly at the rear
of the chest piece 1; that is, opposite the diaphragm 5.
The amplifier 9 and cathode ray tube 10 are powered by a power
supply 13, comprising, in this preferred embodiment, a mercury
battery 13 mounted on a cap 14 which sets into the housing 4 and
connects operably to the components to which it supplies power.
In FIG. 4 the cathode ray tube face 11 is represented with
exemplary controls such as on/off contrast 15, and focus 16. Other
desirable controls such as freeze and repeat may be provided.
The transmission space 6 usually containing air communicates with
air in the hollow tube assembly 2 which divides to forks 17 and 18
and which terminate in ear pieces 19.
In use, the stethoscope is applied in a manner known to physicians
and others similarly skilled, to a patient's body. Cardiac
vibrations, for example, are picked up by the diaphragm or bell 5
and transmitted through the air in the transmission space 6 and the
tube assembly 2 to the listener's ear without electrical
amplification in this preferred embodiment.
Simultaneously, the vibrations are converted by the crystal pick
ups 7, for example, to electrical signals and transmitted via the
wires 8 to the amplifier 9 where they are processed and fed to the
cathode ray tube 10. The vibrations thus picked up from the
patient's body are displayed as a signal or oscilloscopic pattern
directly on the stethoscope for instant interpretation.
The cathode ray tube display would usually be used in conjunction
with the manual use of the stethoscope, one complimenting the
other.
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