JPS6019250B2 - Improvement of medical beds - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a medical bed, and more particularly to a medical bed for precisely measuring changes in a patient's weight during blood dialysis.

When performing hemodialysis on a patient for a long period of time using an artificial kidney device, medical beds have traditionally been frequently used because it is necessary to have the patient lie down to minimize physical fatigue. It has reached this point. In particular, this type of medical bed is equipped with a weight measuring device and is configured to control the hemodialysis operation according to the amount of change in body weight detected by the weight measuring device, and is therefore configured to control the hemodialysis operation based on the amount of change in body weight detected by this device. Because of the need to accurately measure and detect weight, a balance device is usually used as a weight measuring device. By the way, this type of weighing bed balance device that has been used in the past consists of a pair of large and small scale devices, one end of which is attached to a movable bed that moves up and down while the patient lies down.
One end of the other balance device selectively engages with a plurality of suspended wheel weights, and the other free ends of both balance devices are connected to each other by a rod. Since the structure is being explored, various inconveniences have been caused as described below. That is, the weight of a patient placed on a movable bed is first transferred to a large scale device, and then to a small scale device, which is then slowly adjusted to balance the wing weight of this scale device. The so-called load transmission path becomes longer, and as a result,
Errors are likely to occur, and in order to reduce these errors as much as possible, an edge mechanism is provided at the fulcrum of each balance device, but it is subject to severe wear and tear, and the mechanism has to be complicated. This also caused an increase in manufacturing costs. Therefore, the inventor has attempted to overcome the various problems described above.As a result of extensive research and trial production, the smaller scale device of the pair of balance devices incorporated in the weight measurement bed was replaced by a pressure sensor. If you purchase a medical bed in which the weight of the patient on the movable bed detected by this pressure sensor is transmitted as a signal to the display device via the counting circuit, the structure is extremely simple for a medical bed, and the manufacturing cost is low. We found that it is possible to obtain a medical bed that can accurately measure body weight by shortening the transmission path.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a medical bed that is inexpensive and has a robust structure that can accurately detect minute changes in the load placed on the bed.

In order to achieve the above object, the present invention includes a bed that is movable up and down, a support base that supports the movable bed, a frame body on which a mat is placed, and a column extending perpendicularly to the frame body. The lower ends of these supports are attached via bearings to one end of a pivotable pedestal, and the other end of the pedestal is connected to the support pedestal via a rod, so that the center of rotation of the pedestal is fixed. A support shaft is provided in the section, an arm is installed on a part of this support shaft in a direction perpendicular to the support shaft, and the tip of this arm is further connected to a pressure sensor via a pressure detection village, and the load is detected by this pressure sensor. The present invention is characterized in that a signal is sent to a display device via a counting circuit so that the load applied to the movable bed can be directly read.

In the medical bed, a load change amount setting circuit is connected to a display device, and a timer circuit is connected to the display device, and the load change set by the load change amount setting circuit is detected over time by the timer circuit. By doing so, it becomes possible to grasp the time relative to the total amount of change in load.

Furthermore, a load change amount setting circuit is connected to the display device to generate a signal when the display value of the display device and the set value set in the load change amount setting circuit match, and this signal is sent to the time circuit. It is preferable that the load change time is detected by supplying the load change amount so that the time when the preset change amount is reached can be detected immediately.

In addition, if a timer is attached to the display device and the time set on this timer is used to control the measurement of the amount of change in the load reloaded on the movable bed, it is possible to not only control the change in load depending on time. It is more preferable to attach an alarm device to this timer and to activate the alarm device when the set time of the timer is reached, since it is possible to know the elapsed time of the timer set time.

Other objects and advantages of the present invention will become more apparent from the following description.

Next, a preferred embodiment of the medical bed according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a vertically movable bed for weight measurement. a pillar 14 that is located in the four joints and supports this, and the frame 12
It basically consists of a mat 16 placed on top.

A bearing 18 with extremely high rotational accuracy is attached to the lower tip of each support column 14, and the inner ring of this bearing 18 is fixed near one end of the bearing pedestal 22.

This bearing pedestal 22 is usually formed of a metal flat plate with an inner thickness, and a separate large-diameter bearing 24 is located approximately at the center of the bearing pedestal 22.
A bearing 26 having the same diameter as the bearing 18 is fixed near the end of the pond. However, the bearing 26 connects the inner ring to the lower end of a rod 30 that supports the fixed bed 28 located outside the movable bed 10. Further, the bearing 24 has a support shaft 31 mounted thereon so that the inner ring of the bearing pedestal 22, which is disposed opposite to each joint of the movable bed 10, is corrugated with respect to each other. Arms 32 and 32' are provided to protrude from substantially the center of the support shaft 31 configured and arranged in this way, so as to face each other in the horizontal direction. Furthermore, these pair of arms 32,
32', as shown in FIG.
Pressure sensor (load cell) as a pressure sensing device at the lower end of
36 , the pressure sensor 36 converts the load on the movable bed 10 into an electrical signal, and the electrical signal is introduced into the display diamond 40 via the cable 38 . Display bag straight 40
is a device for converting the load detected as an analog leather by the pressure sensor 36 into a digital quantity and making it directly readable.As shown in FIG. It is configured by being rearranged within the head-side side wall 44 of the bed that extends upward. In addition, the fourth
The figure shows an operation panel 48 on which an operation mechanism 46 for visually operating the medical bed is arranged, and on its surface there is a power switch 50, a mode switching switch 52, and an indicator lamp showing the operating state of the display device 40. 54, buzzer stop switch 5
6, a change amount setting switch 58, and head and foot up/down switches 60, 62 are provided. Next, an electric circuit incorporated in the apparatus of the present invention constructed as described above will be explained with reference to the block diagram shown in FIG.

The electric circuit of the device of the present invention basically consists of an analog quantity/digital quantity conversion parallel control circuit 64, three types of count circuits 66, 68, 70 connected to this, and display circuits 72, 74, 76 connected to the respective count circuits. It is structured in a specific manner.

When used as a hemodialysis bed, the counting circuit 66 measures the weight of the patient before dialysis and displays the weight of the patient in the display circuit 72.
The counting circuit 68 measures the weight of the patient undergoing dialysis and sends the signal to the display circuit 74, and the counting circuit 70 measures and displays the weight of the patient who has lost during dialysis. This is to be introduced into the display circuit 76, and especially the count circuit 7 is connected to the switch 78.
A buzzer 82 (alarm device) is activated when the weight change amount setting circuit 80 of the patient, which has decreased due to dialysis, matches the value set in advance by the weight change amount setting circuit 8. Coincidence counting circuit 84 is connected such that energized. Note that the count circuits 66, 68
．． 701 is connected to a mode command circuit 86, and a dialysis time meter 88 is further connected to the rate mode command circuit. In addition, in FIG. 5, reference numeral 90 indicates a tare subtraction circuit. The medical bed according to the present invention is constructed as described above, and its functions and effects will be explained next.

First, before a dialysis patient lies down on the movable bed 10, the movable bed 10 is tared.

That is, when the power switch 48 on the operation panel 46 is turned ON, a tare weight subtraction command is issued from the mode command circuit 86a, and this signal is sent to the count circuit 66, and the tare weight subtraction circuit 90 operates to calculate the value. and feeds it back to the count circuit 66. Next, when the switch 52 is pressed, a command b is issued from the mode command circuit 86, and the count circuit 66 waits for the patient to lie down in a tared state. When a patient is placed on the movable bed 10, the patient's weight presses down on the column 14, and this load is transferred to a bearing 18 fixed to a bearing pedestal 22, which bearing 19 therefore transfers said load to the rotation of the bearing. Under the action, the signal is transmitted to the bearing pedestal 22, and the pedestal 22 rotates slightly around the bearing 26, and also amplifies the amplitude of the arms 32, 32', which are integrally formed with the support rod 31, and rotates them upward. make it move. As a result, the rotational action of the arms 32, 32' is translated into a vertical force on the pressure-sensing punch 34 mounted at its tip, pulling the pressure-sensing punch 34 upwardly. Therefore, the upward pulling force of the pressure sensing punch 34 is sensed by the pressure sensor coupled to its lower end, and the load corresponding to the patient's weight is converted into a pulse by the analog/digital conversion and control circuit 64. , are transmitted to the count circuit 66. Note that the transmitted weight of the patient is directly read by a doctor or the like by a display circuit 72 that displays the weight before dialysis. Next, when the switch 52 is pressed, a command c is introduced from the mode command circuit 86 to the count circuits 68 and 701, and a command e is introduced to the dialysis time meter to start counting the dialysis time. At the same time, when hemodialysis is started, the weight of the patient placed on the movable bed 10 is
The body weight gradually begins to decrease, and the pressure sensor 3 detects this change in body weight.
6, the change value is converted into a pulse signal by an analog quantity/digital quantity conversion control circuit 64, and sent to a counting circuit 701, and the value is displayed by a display circuit 74 that displays the amount of change in body weight. . Further, at this time, the count circuit 68 calculates the addition or subtraction between the numerical value counted by the counting circuit 66 and the numerical value counted by the counting circuit 70, and displays the calculated numerical value on the display circuit 74. That is, it will be easily understood that the display circuit 74 always displays the patient's weight before dialysis minus the weight generated by dialysis. Further, when the switch 52 is pressed, the mode command circuit 86 emits a signal d, and this signal is introduced into all of the counting circuits 66, 68, and 70, and each counting circuit stops its counting operation by this signal d. The numerical value in the count is fixed along with the display circuits 72, 74 .
The display of 76 is also fixed. Furthermore, if the signal f is introduced into the dialysis time meter 88 through the mode command circuit 86 at the same time as the signal d, the clocking of the dialysis time meter 88 can be stopped by this signal f, and as a result, the dialysis time The display device 40 displays the patient's current weight and the amount of weight loss due to dialysis.
can be grasped at once. Therefore, by monitoring the patient's weight loss, it is possible to perform dialysis according to the patient's condition.
is configured as a timer and a buzzer circuit (not shown) is attached to this.
It is also possible to control the amount of dialysis by so-called time, such as by connecting a buzzer circuit and emitting an alarm when a predetermined time elapses to notify the end of dialysis.
In addition, in FIG. 5, the counting circuit 7 and the coincidence counting circuit 84 are shown.
discloses a configuration in which a change amount setting circuit 80 is connected to the body weight via the change amount setting circuit 80. In this case, the weight value to be reduced is set in advance in the change amount setting circuit 80, and the weight value is calculated by the counting circuit 7. When the calculated value matches the set value, the coincidence counting circuit emits a signal and energizes the buzzer circuit 82. This circuit has the advantage that the dialysis operation can be controlled based on the amount of change. Of course, if this coincidence signal is introduced into the dialysis time meter, it can be expected that the expected amount of change in body weight can be grasped over time. As described above, according to the device of the present invention, a pressure sensor is used in place of the conventional weighing device which has a complicated structure, so the structure can be simplified compared to the conventional weighing bed. In addition, the measurement accuracy of the weight transmission mechanism that reaches the pressure sensor from the movable bed can be significantly improved, and the patient's weight taken by the pressure sensor is all converted into an electrical signal, counted, and displayed. Therefore, by connecting a clock circuit, a weight change amount setting circuit, etc., it is possible to obtain the effect of easily achieving a transparent measurement based on time or weight change amount.

As a result, the effects of the device of the present invention are extremely significant, such as the ability to utilize a certain amount of labor required for dialysis in other fields. The preferred embodiments of the medical bed according to the present invention have been described above in detail based on the attached drawings, but the present invention is not limited to these embodiments and is within the scope of the spirit of the present invention. Of course, various improvements and design changes are possible.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway schematic perspective view of a fixed bed, a movable bed, and a balance device of a medical bed according to the present invention, Fig. 2 is a partially cutaway front view of the medical bed, and Fig. 3 is a schematic perspective view of the medical bed. A right side view, FIG. 4 is an enlarged perspective view of the operation panel with the operation mechanism attached thereto, and FIG. 5 is a block diagram of the electric circuit incorporated in the medical bed. DESCRIPTION OF SYMBOLS 10... Movable bed, 12... Frame, 14... Support, 16... Mat, 18... Bearing, 20... Inner ring, 22... Bearing pedestal, 24... Bearing, 26... Bearing, 28...
Fixed bed, 30... Rod, 31... Support shaft, 32, 3
2'...Arm, 34...Pressure detection punch, 36...Pressure sensor,
38... Cable, 40... Display device, 42... Caster, 44... Side wall, 46... Operating mechanism, 48...
...Operation board, 50...Power switch, 52...Mode feed switch, 54...Display lamp, 56...Puza stop switch, 58...Change amount setting switch, 60...Head up/down switch, 62... ...Foot up/down switch, 64...
Analog quantity/digital quantity conversion parallel control switch, 66...
Count circuit, 68... Count circuit, 70... Count circuit, 72... Display circuit, 74... Display circuit, 76.
...Display circuit, 78...Switch, 80...Body weight change amount setting circuit, 82...Buzzer, 84...Coincidence counting circuit, 86...
...Mode command circuit, 88...Dialysis time meter, 90...Tare weight subtraction circuit. FIG. IFIG. 2 FIG. 3 FIG-mu FIG. 5

Claims (1)

[Scope of Claims] 1. A bed that is movable up and down, a frame body on which a mat is placed on a support base that supports this movable bed, and columns extending perpendicularly to this frame body are provided, and the lower ends of these columns are provided. attached to one end of a pedestal configured to be able to rotate via a bearing,
The other end of the pedestal is coupled to the support pedestal via a rod, a support shaft is provided at the center of rotation of the pedestal, and an arm is provided on a part of the support shaft extending in a direction perpendicular to the support shaft; Furthermore, the tip of this arm is connected to a pressure sensor via a pressure detection rod, and the load detection signal from this pressure sensor is sent to a display device via a counting circuit, so that the load applied to the movable bed can be directly read. A medical bed characterized by: 2. A load change amount setting circuit is connected to the display device, and a clock circuit is connected to the display device, so that the load change set by the load change amount setting circuit is detected chronologically by the time measurement circuit. A medical bed according to claim 1. 3 Connect a load change amount setting circuit to the display device, generate a signal when the display value of the display device and the set value set in the load change amount setting circuit match, and send this signal to the timing circuit. 3. The medical bed according to claim 2, wherein the medical bed is configured to detect the load change time. 4. The medical bed according to claim 1, wherein a timer is attached to the display device, and the measurement of the amount of change in the load placed on the movable bed is controlled based on the set time of the timer. 5. The medical bed according to claim 4, wherein an alarm device is attached to the timer, and the alarm device is activated when the set time of the timer is reached.