U.S. patent number 3,814,414 [Application Number 05/414,088] was granted by the patent office on 1974-06-04 for medical examination table.
Invention is credited to Hector Chapa.
United States Patent |
3,814,414 |
Chapa |
June 4, 1974 |
MEDICAL EXAMINATION TABLE
Abstract
A medical examination table intended primarily for X-ray
examinations, and comprising a movable base and a table proper
movable vertically relative thereto. The table proper comprises a
main frame, and an extensible section. The main frame is supported
at each end from the base by an hydraulically actuated piston and
is tiltable on a longitudinal axis under the influence of an
hydraulically actuated piston. A screw stem provides adjustment for
the extensible section relative to the main frame and is actuated
by an electric motor. An hydraulic system is provided for the
hydraulic cylinders and included therein is a power cylinder in
which hydraulic pressure is generated by an electric motor. An
electric system is also provided which includes the motors
aforesaid. A control console includes operating levers for
determining the flow of the hydraulic medium to the hydraulic
cylinders and switching members for the electric circuit.
Inventors: |
Chapa; Hector (San Antonio,
TX) |
Family
ID: |
26956959 |
Appl.
No.: |
05/414,088 |
Filed: |
November 8, 1973 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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274635 |
Jul 24, 1972 |
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Current U.S.
Class: |
5/601; 5/611;
128/873; 5/607; 5/610; 5/621; 5/614 |
Current CPC
Class: |
A61F
5/3784 (20130101); A61B 6/0442 (20130101); A61G
13/02 (20130101); A61B 6/04 (20130101); A61G
2210/50 (20130101) |
Current International
Class: |
A61F
5/37 (20060101); A61B 6/04 (20060101); A61G
13/02 (20060101); A61G 13/00 (20060101); A61g
013/00 () |
Field of
Search: |
;128/134
;269/60,322,323,324,325,326,328 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Lake; Roy
Assistant Examiner: Bicks; Mark S.
Attorney, Agent or Firm: Robertson; John A.
Parent Case Text
This application is a continuation-in-part application of the
copending application of Hector Chapa, Ser. No. 274,635, filed July
24, 1972, and now abandoned for "Multi-Position Medical Table."
Claims
What is claimed is:
1. In a medical table for X-ray examinations:
a. a mobile base;
b. a front hydraulic cylinder upstanding from said base and having
a piston projecting upwardly therefrom;
c. a rear hydraulic cylinder upstanding from said base and having a
piston upstanding therefrom;
d. a rectangular table frame presenting a front end piece, a rear
end piece and side members;
e. a loose pivotal connection between said rear end piece and the
piston of said rear cylinder and located centrally thereof;
f. a shaft non-rotatably connected to said front end piece
centrally thereof;
g. a bearing pivotally mounted on the upper end of the piston of
said front hydraulic cylinder on a transverse axis, said bearing
receiving said shaft;
h. an extensible stabilizer comprising a female member secured to
said base and a male member having an opening receiving said
shaft;
i. an arm extending radially from said shaft;
j. a piston having its upper end pivotally connected to said
arm;
k. an hydraulic cylinder receiving said last mentioned piston and
having its lower end pivotally connected to the male member of said
stabilizer;
l. a transparent extensible table section mounted for longitudinal
sliding movement on said frame;
m. means for adjusting said extensible section relative to said
frame and holding it in an adjusted position, and
n. means for securing a patient in position on said extensible
section.
2. The medical examination table of claim 1 in which the means for
adjusting the extensible section relative to the frame comprises a
boss depending from said extensible section and having a threaded
opening, together with a screw stem threadedly received in said
opening and having its opposite ends fixedly secured to said frame,
and an electric motor for rotating said screw stem.
3. The medical examination table of claim 1 in which the bearing
has an end face with calibrations inscribed thereon, and in which
the shaft projects beyond said end face and carries a pointer
cooperating with said calibrations.
4. The medical examination table of claim 1 in which said hydraulic
cylinders are included in an hydraulic system which also includes a
power unit mounted on said base, and including a tank, a pump and
an electric motor for driving said pump.
5. The medical examination table of claim 4 in which the tank has a
connection for a hand pump to be used in case of power failure.
6. The medical examination table of claim 4 in which the electric
motors are included in an electric circuit, together with a console
on said base in which is mounted electric switches for said
electric circuit and operating levers for said hydraulic
system.
7. The medical examination table of claim 1 in which the base is of
elongate U-shape presenting front and rear legs, with said front
hydraulic cylinder mounted on said front leg and the rear hydraulic
cylinder on said rear leg.
8. The medical examination table of claim 1 in which the means for
securing a patient in position on the extensible table section
comprises a garment that is wrapped about the patient and includes
two sets of straps which, when the garment is wrapped about the
patient, extend from opposite sides of the garment, a fitting on
the end of each of said straps and a plurality of strap anchors on
said extensible section cooperating with said fittings.
9. The medical examination table of claim 8 in which the garment
has upper and side edges and is formed with three arm hole openings
adjacent to said upper edge with one of said openings being located
centrally of the garment and each of the other openings located
adjacent to a side edge, and one set of straps has end portions
secured to the garment centrally thereof and the other set of
straps has end portions secured to the garment adjacent to a side
edge thereof.
10. The medical examination table of claim 9 in which the
extensible table section is of plexiglass and has side flanges
overlying the side members of the frame, and the strap anchors are
mounted on the exterior faces of said flanges.
Description
The present invention relates to medical examination tables and is
concerned primarily with such a table intended for X-ray
examinations and which includes means for securely affixing a
patient thereto and also means for adjusting angular positions of
the table on longitudinal and transverse axes.
BACKGROUND OF THE INVENTION
Under conditions now prevailing in the practice of medicine, it is
often necessary to X-ray certain portions of a patient's body which
are numerous and varied. While X-ray apparatus is available for
X-raying a patient while either in a vertical or prone position,
such apparatus is normally fixed or stationery, and in the instance
of the patient being in a prone position, it is necessary that the
patient be moved into various angular positions relative to the
X-ray machine. Heretofore, various make-shift devices have been
employed for this purpose.
The present invention is founded on the basic concept of providing
an examination table to which a patient may be securely affixed in
a desired position, with the height of the table being adjustable
and the angular position of the table also adjustable on
longitudinal and transverse axes.
OBJECTS OF THE INVENTION
With the foregoing conditions in mind, the present invention has in
view the following objectives:
1. To provide a medical examination table comprising a movable base
and a table proper which is vertically adjustable relative to the
base and which comprises a main frame and an extensible section,
with the main frame being angularly adjustable on longitudinal and
transverse axes.
2. To provide, in a medical examination table of the type noted,
hydraulic cylinder and piston assemblies for causing the foregoing
adjustments.
3. To provide, in a medical examination table of the character
aforesaid, hydraulic cylinders for elevating the main frame and
casing angular adjustment on a transverse axis, which include
holding valves for maintaining the table proper in a desired
adjusted position in the event of power failure.
4. To provide, in a medical examination table of the kind
described, an hydraulic cylinder for causing actuation on a
longitudinal axis which includes a pair of holding valves to
maintain the table proper in an angularly adjusted position in the
event of power failure.
5. To provide, in a medical examination table of the type noted,
mechanism for adjusting the extensible section relative to the main
frame and which comprises a screw stem actuated by an electric
motor.
6. To provide, in a medical examination table of the kind
aforesaid, an hydraulic system which includes the hydraulic
cylinders aforesaid and a power cylinder in which pressure in the
hydraulic medium is generated by an electric motor.
7. To provide, in a medical examination table of the character
aforesaid, a control console which includes levers for operating
the valves which control the flow of the hydraulic medium to the
hydraulic cylinders and switch operating members for controlling
the operation of the electric motors.
8. To provide, in a medical examination table of the type noted, a
connection to the power cylinder for a hand pump to be used in the
event of power failure.
9. To provide, in a medical examination table of the character
aforesaid, means for securing a patient in fixed position on the
extensible section and which means takes the form of a garment
which is wrapped about a patient and which includes straps that are
anchored to the extensible section.
10. To provide, in a medical examination table of the kind
described, an extensible section of the table proper which is of a
transparent material, such a plexiglass.
Various other more detailed objects and advantages of the
invention, such as arise in connection with carrying out the above
ideas in a practical embodiment, will, in part, become apparent
and, in part, be hereafter stated as the description of the
invention proceeds.
SUMMARY OF THE INVENTION
The foregoing objects are achieved by providing a medical
examination table comprising a base of elongated U-shape presenting
a horizontal leg at each end. This base is supported on castors
which impart mobility thereto. Upstanding from each leg is an
hydraulic cylinder. Associated with each cylinder is a piston which
is pivotally secured at its upper end to an end piece of a
rectangular main frame. An extensible section of plexiglass is
mounted for longitudinal adjustment on the main frame. The main
frame is supported at one end by a shaft received in a bearing
which is pivotally secured to the piston at that end. The shaft is
non-rotatable relative to the frame and extending therefrom and in
driving relation thereto is an arm connected to a piston, the lower
end portion of which is received in an hydraulic cylinder secured
to the movable element of a two-part stabilizer, the upper end of
which is connected to the shaft and the lower end to the base.
A screw stem is rotatably mounted in a longitudinally fixed
position on the main frame and passes through a threaded boss on
the extensible section. The screw stem is operated by an electric
motor. An hydraulic system for the cylinders aforesaid includes a
power cylinder in which pressure is built up on the hydraulic
medium by an electric motor. A console is mounted on the base and
includes levers for the hydraulic system and switches for the
electric motor. A connection for a hand pump to the power cylinder
is provided in case of power failure and a reel carrying a
conductor is mounted on the base, with the conductor being
extensible and having a plug at one end for connection to a source
of power.
A wrap-around garment for the patient is provided and designed so
that after the garment is wrapped about the patient a plurality of
straps extend from each side of the patient. Each of these straps
has a fitting at its free end which is detachably secured to an
anchor on a side of the extensible section.
For a full and more complete understanding of the invention,
reference may be had to the following description and the
accompanying drawings wherein:
FIG. 1 is a perspective of a medical examination table designed in
accordance with the precepts of this invention, with the
patient-enveloping garment omitted;
FIG. 2 is a view in end elevation of the table;
FIG. 3 is a detail horizontal section through the piston and
stabilizer at one end, being taken on the plane of the line 3--3 of
FIG. 1;
FIG. 4 is a detail side elevation of the elevating and angular
adjusting mechanism at one end, with a portion of the frame in
section;
FIG. 5 is a detail perspective illustrating the elements of the
elevating and tilting mechanism in exploded relation; this portion
of the mechanism being that which is included in the circle
designated 5 of FIG. 1;
FIG. 6 is a detailed perspective illustrating the connection of the
upper end of a piston to the end of the frame remote from that at
which the tilting mechanism is located; the area of this connection
being indicated by the circle designated 6 of FIG. 1;
FIG. 7 is a plan view of the patient-enveloping garment in open
position;
FIG. 8 is a perspective depicting the first step of applying the
garment to the patient;
FIG. 9 is another perspective illustrating the garment as fully
applied to the patient;
FIG. 10 is a perspective showing the patient as secured to the
table;
FIG. 11 is a schematic view of the hydraulic system, and
FIG. 12 is a wiring diagram of the electric circuit.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In describing the subject medical examination table, the table
structure will first be described, then the garment, and finally
the hydraulic system and electric circuit.
TABLE STRUCTURE
Referring now to the drawings wherein like reference characters
denote corresponding elements throughout the several views, and
first more particularly to FIG. 1, the medical examination table of
this invention is shown as comprising a base identified in its
entirety by the reference character 15. Base 15 is of an elongate
U-shape presenting a back or side piece 16, a leg 17 at the end of
the table which is hereinafter referred to as the front end, and a
second leg 18 at the other or rear end. Secured to the underside of
base 15 are castors 19 which are of a type which permits them to be
locked in fixed positions of adjustment on vertical axes. Castors
of this type are well known and available to the public, and,
hence, details thereof are not herein illustrated or described.
Mounted on rear base leg 18 and extending vertically upwardly
therefrom is an hydraulic cylinder 20 which receives a piston 21.
Another hydraulic cylinder 22 is mounted on front leg 17 and
receives a piston 23.
A table proper is referred to generally at 24 and comrpises a main
frame indicated in its entirety at 25 and an extensible section 26.
Frame 25 is of rectangular shape presenting side members 27, a
front end piece 28 and a rear end piece 29. Mounted on the outer
face of each side member 27 is a channel-shaped guide 30.
Extensible section 26 is of a transparent material such as
plexiglass, and includes a flange 31 at each side which overlies
the guide 30 at that side. Any suitable anti-friction device such
as rollers may be mounted on each guide 30 and flange 31. Secured
to the outer faces of flanges 31 are a plurality of strap anchors
32 for a purpose to be later described. Depending from the
underface to extensible section 26 and at a location closely
adjacent to side piece 27 is a boss 33 having a threaded
longitudinal passage. A screw stem 34 is received in boss 33 and
has its rear end anchored to end piece 29 as indicated at 35, while
its front end passes through an opening in front end piece 28 where
it is operatively connected to a driving element of a gear
reduction unit 36 mounted on end piece 28. Gear reduction unit 36
is driven by an electric motor 37. A pair of limit switches, which
are not illustrated in FIG. 1 but which are represented
diagrammatically at 38 in FIG. 12, are mounted at opposite ends of
screw stem 34 to disable motor 37 when boss 33 reaches a desired
limit of longitudinal travel.
Referring now more particularly to FIG. 6, piston 21 is shown as
carrying a U-shaped bracket 29 at its upper end. Bracket 39
presents a pair of plates 40 which are disposed on opposite sides
of rear end piece 29, and are spaced apart a distance which
provides for a required amount of longitudinal movement of frame 25
relative to piston 21 which is necessary to allow for tilting of
frame 25 on a transverse axis. Each plate 40 is formed with a slot
41 which receives a stub shaft 42 that is secured to end piece
29.
At this point it is well to note that frame 25 may be tilted on a
transverse axis to a comparatively small degree, with the maximum
tilt being about 35.degree.. This tilting action results in a
variation of the longitudinal position of end piece 29 relative to
piston 21, but is accommodated by the loose connection afforded by
bracket 39.
Referring now to FIGS. 2, 3, 4 and 5, and first more particularly
to FIG. 4, a channel bar 43 is secured to the underside of front
end piece 28 in any preferred manner, as by welding. Channel bar 43
presents a lower flange 44 to which one end of a shaft 45 is
non-rotatably secured, as by a bracket 49 (FIG. 5) and screw 47
which passes through an opening 48 in shaft 45.
The front end portion of shaft 45 is rotatable in a bearing 49
which is pivotally mounted on the upper end of piston 23 by a yoke
50. Bearing 49 has a front end face 51 on which is inscribed
suitable calibrations which cooperate with a pointer 52 on a
portion of shaft 45 which projects beyond end face 50 to indicate
the angular position of table 24.
A stabilizer is indicated in its entirety at 53 and comprises a
lower female channel member 54 which is secured to base leg 17 just
behind piston 22 and a sliding male member 55 having a slot 56 at
its upper end which receives shaft 45. At this point it is well to
note that the pivotal mounting of bearing 49 in yoke 50 and slot 56
accommodates tilting movement of frame 25 on a transverse axis.
An arm 57 has one end drivably connected to shaft 45 in any
preferred manner, such as by being welded thereto, and extends
radially therefrom. Pivotally connected to the outer free end of
arm 57 is a piston 58, with the pivotal connection being indicated
at 59. Piston 58 is received in an hydraulic cylinder 60, the lower
end of which is pivotally secured to stabilizer member 55 by the
pivotal connection shown at 14. When an hydraulic medium under
pressure is applied to cylinder 60, piston 58 is actuated to swing
arm 57, and hence, cause rotation of shaft 45 to tilt frame 25 on a
longitudinal axis.
Mounted on the front end of base 15 is an hydraulic unit designated
generally 61 which includes a power cylinder 62 and an electric
motor 63. A connection 64 is shown for a hand pump for generating
pressure in power cylinder 62 when electric power fails. Also
secured to base leg 17 is a casing 65 which houses a reel for an
extensible cord 66 having a plug 67 at its free end for connection
to a source of power. A console 68 is mounted on base 16 and
carries a plurality of levers 69 for controlling the flow of the
hydraulic medium in the hydraulic system and switches 70 for the
electric circuit.
THE GARMENT
Referring now more particularly to FIGS. 7, 8, 9 and 10, a garment
for use in securing a patient in position on table 24 will now be
described. The garment comprises a piece 71 of heavy, durable
fabric, such as denim or canvas, and is of the general trapezoidal
shape depicted in FIG. 3. This shape presents a short top edge 72,
a longer bottom edge 73 and side edges 74. Formed in piece 71
adjacent to edge 72 are three arm holes 75a, 75b and 75c. Secured
to what is the outer face of piece 71 when the garment is in
patient-enveloping position, are a plurality of straps 76. One end
of each strap 76 is secured to piece 71 as by the stitching
represented at 77. Another plurality of straps 78 have end portions
79 which are secured to the inner face of piece 71 along a side
edge 74 as by stitching. Each of the straps 76 and 78 includes
means for adjusting its effective length such as indicated at 80
and carries a fitting 81 at its free end which is adapted for
cooperation with an anchor 32 on extensible section 26. It is
notable that while two straps 76 and two straps 78 are herein
illustrated and described, this number will probably be increased
to four in actual practice of the invention. The illustration of
only two of each set of straps is for the purpose of simplifying
the illustration of the drawings.
The manner in which the garment is applied to the patient is
illustrated in FIGS. 8 and 9. Thus, the right arm 82 of the patient
is passed through the center arm hole 75b and the patient's left
arm 83 through the arm hole 75c. That portion of the garment
between the center and side edge adjacent arm hole 75a is wrapped
about the back of the patient, whereupon the patient's arm is
passed through arm hole 75a. This provides a double ply of the
garment in front of the patient. In this position, straps 76 extend
from the central portion of the patient's back and are directed to
one side edge of table extension 26, while straps 78 are directed
towards the other side edge of the table extension 26.
THE HYDRAULIC SYSTEM
Referring now to FIG. 11, the hydraulic system will now be
described. Power cylinder 62 is shown as including a tank 84 and a
pump 85 which is driven by motor 63. A flow control unit 86 is
included in console 68.
From tank 84 extends a conduit 87 to the connection 64 for a hand
pump. At a point 88 in line 87 a conduit 89 extends to the flow
control unit. A one-way check valve 90 in included in line 87
between pump connection 64 and point 88. This valve permits the
flow of the hydraulic medium from tank 84 to the flow control unit,
but prevents flow in a return direction. Another conduit 91 extends
from pump 85 and is connected to point 88 with another one-way
check valve 92 included therein. A return flow conduit 93 extends
from unit 86 to tank 84.
A valve bank is designated generally 94. It is connected to the
flow control unit 86 by a conduit 95. Hydraulic medium from valve
bank 94 is returned to unit 86 by line 96. A valve for front
cylinder 22 is shown at 97 and is connected thereto by liner 98 and
99. When this valve is open or in effective position, cylinder 22
is activated to the exclusion of rear cylinder 20. A valve 100 is
connected to rear cylinder 20 by lines 101 and 102. Valve 100
operates rear cylinder 20 to the exclusion of front cylinder 22.
Another valve 103 is provided for causing simultaneous operation of
both cylinders 20 and 22. Valve 103 is connected to line 98 by line
104 and to line 99 by line 105. It is also connected to line 101 by
line 106 and to line 102 by line 107. A so-called tilting valve is
indicated at 108 and is connected by lines 109 and 110 to cylinder
60. It will be understood that levers 69 in console 68 operate the
valves in bank 94. Thus, there is one lever for valve 97, another
for valve 100, another for valve 103 and the fourth for valve
108.
While they are not illustrated in the drawings, it is noted that
each of the cylinders 20 and 22 is provided with a so-called safety
valve at its lower end to prevent the respective piston from
falling in the event of power failure. It is believed that such
safety valves are so well known that it is not necessary to
illustrate or describe them in detail. Moreover, tilting cylinder
60 is provided with such a safety valve at each end. Thus, with the
table in any angular position, should power fail, it will remain in
such position.
THE ELECTRIC CIRCUIT
A bank of switches is represented at 111. Included in this bank is
a main control switch 112 which is closed to render any of the
other switches effective. This switch is effective on line 113
which includes a fuse 114 to control the flow of electric current
from the source through cable 66. From switch 112 extends a line
115 to which another line 116 is connected at point 117. Line 116
includes a switch 118 which controls the flow of current to pump
motor 63. From point 117 a line 119 extends to a pole 120 of a
double-throw switch. This double-throw switch includes poles 121
which are connected by lines 122 and 123 to gear box motor 37.
Limit switches 38 are included in these lines 122 and 123. It is
evident that when the double-throw switch is in one position, motor
37 is driven in one direction to rotate screw stem 34 in the
corresponding direction, and when in its other effective position,
motor 37 and screw stem 34 are rotated in the reverse
direction.
OPERATION
While the manner of use and mode of operation of the above
described medical examination table are believed to be obvious from
the illustration of the drawings and description of parts set forth
above, they may be briefly described as follows.
Garment 71 is first applied to the patient in the wrapped-around
position illustrated, the patient positioned on extensible section
26 and fittings 81 secured to strap anchors 32. Castors 19 are
released from their locked position and base 15 rolled to the
desired position relative to the X-ray machine and plug 67 is
connected to a suitable outlet. The proper lever 69 is now availed
of to determine which of the cylinder 20 or 22 is to be raised or
lowered or whether they are to be operated simultaneously. Thus,
the table 24 is brought to a desired vertical position relative to
the X-ray machine. The double-throw switch which controls the motor
37 is then operated to achieve a desired longitudinal adjustment of
extensible table section 26. Should it be desired to tilt the table
on its longitudinal axis, the appropriate lever 29 is utilized to
render the valve 108 effective to cause cylinder 60 to rotate the
table on shaft 45.
While a preferred specific embodiment is herein disclosed, it is to
be clearly understood that the invention is not to be limited to
the exact constructions, mechanisms and materials illustrated and
described because various modifications of these details may be
provided in putting the invention into practice.
* * * * *