JP3251374B2 - Medical Coriolis flowmeter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Coriolis flow meter for medical use, and more particularly, to dispose an infusion tube for administering a drug solution to a patient after the completion of the administration, always easily attach a new infusion tube, and The present invention relates to a medical Coriolis flowmeter capable of measuring a dosage with high accuracy.

[0002]

2. Description of the Related Art An infusion set is used as a method for injecting a predetermined amount of a drug solution into a patient. Infusion set
Usually, it is configured as shown in FIG. FIG. 4 is a diagram showing a configuration of a conventional infusion set, wherein 21 is a drug solution 21.
a is an infusion bottle containing a and sealed by a stopper 21b,
The infusion set includes the infusion bottle 21, the introduction needle 22, the drip tube 2
3, an infusion tube 24, a clamp 25, a rubber tube 26, an octopus tube 27 and an infusion needle 28, each of which is connected in cascade. The infusion bottle 21 is suspended from a stand (not shown) to give a predetermined head to the drug solution 21a. The introduction needle 22 penetrates the stopper 21b and communicates with the infusion, and at the same time, an air replacement needle (not shown) penetrates the stopper 21b, and the medicine is dropped into the drip tube 23 by air replacement.
From 4, it flows down in the infusion tube 24 as a continuous flow. The infusion tube 24 is inserted between the clamp 25c and the roller 25b, and the axis of the roller 25b moves up and down along the inclined groove 25a to be pressed between the fixed clamp 25c and the roller 25b to seal the liquid medicine from the sealed state to the maximum open state. The dosage is adjusted to a flow rate corresponding to an arbitrary opening area in. The infusion needle 28 is inserted into a vein and administered to a human body. Octopus tube 27
Is for preventing air from flowing into the vein, and the air contained in the infusion is stored in the air reservoir 27a and the infusion needle 2
8 so that it does not flow out. The rubber tube 26 serves as a flexible tube for holding the infusion needle 28 stably on the human body during liquid feeding.

[0003] The dosage in the above infusion set is infusion 2
Head difference consisting of head and venous pressure of 1a and infusion tube 2
The flow rate becomes inversely proportional to the flow path resistance of 4 or the like. The amount of infusion is constant if the drug solution and temperature are determined, so when the flow rate is high, the number of infusions per unit time is large, and furthermore, it is continuous, but the dosage administered to the human body is per unit time. It is determined by the number of infusions.
To adjust the flow path resistance. However, the dosage varies depending on the type of drug solution, the temperature, the head, the venous pressure of the patient, the posture, and the like.
There was the complexity of adjusting b and correcting the infusion flow rate. Moreover, a highly accurate dosage could not be obtained. Also,
Although a tubing pump or the like is used as an infusion method for injecting and removing a dialysate in extracorporeal dialysis, peritoneal dialysis, or the like, the flow rate accuracy was unsatisfactory.

[0004]

The present invention has been made in view of the above-mentioned circumstances, and has been made in consideration of the above circumstances. It is intended to accurately measure a dosage of a medical solution as a mass flow rate and to provide a new infusion tube used for the administration for each administration. Even if it is exchanged, the high-precision flow measurement enables the inexperienced person in the operation of the flow meter to easily install the infusion tube as a measurement tube and use the flow measurement part excluding the measurement tube repeatedly. It is intended to provide an effective flow meter.

[0005]

[Configuration] The present invention, in order to achieve the above object, a case member for pressing and supporting the該輸liquid tube longitudinal direction of the predetermined interval as the outer circumferential surface a detachable transportation liquid tube are in close contact, said of the case member A base for oscillatingly supporting a predetermined section, driving means for reciprocatingly driving the infusion tube at right angles to the longitudinal direction in the middle of the predetermined section between the base and the case member, an intermediate portion of the infusion tube and a support portion consists of a pair of high sensor for detecting the Coriolis force acting on該輸liquid tube, the mass flow rate measuring means for detecting a Coriolis force is detected by the displacement sensor as a difference signal in the previous SL case member, A second case having a semicircular groove that is cantilevered by the base and guides the infusion tube in a U-shape with the inlet and the outlet open at the support side, A semicircular groove having a lower surface opening, which is detachably fixed to the base, cooperates with the second case member, and presses and locks an outer peripheral surface in a parallel portion of the U-shaped infusion tube; And a first case member having a flat plate portion for pressing and supporting the first case member. Hereinafter, a description will be given based on examples of the present invention.

FIG. 1 is a view showing a dosing device for explaining the relationship of the use site in an example of a medical Coriolis flow meter according to the present invention, wherein 1 is a medical Coriolis flow meter, 2 is an infusion tube, and 3 is an infusion tube. Is a rubber tube, 4 is an octopus tube, and 5 is an infusion needle.

A Coriolis flow meter 1 for medical use in the present invention to be described later is an infusion bottle or the like (not shown) containing a drug solution.
Is measured as a mass flow rate based on the Coriolis force, and an infusion needle (or drip needle) 5 is inserted into a vein via a rubber tube 3 and an octopus tube 4 to transfer the solution to the human body. This is the main part of the device for administering medication.

FIGS. 2A and 2B are diagrams for explaining an example of the structure of a medical Coriolis flow meter according to the present invention. FIG. 2B is a sectional view, and FIG. 2B is a diagram of FIG. View Y-Y
1 is a Coriolis flow meter for medical use, 2 is an infusion tube, 7 is a base, 8 is a first case member, 9 is a second case member, 10 is a drive unit, and 11 is a displacement sensor. , 12 is a drive arithmetic unit, 13 is a transmission line, 14 is a fixing screw, and 15 is a cover.

In FIG. 2, a base 7 has, for example, an axis X-
A concave portion 7b for inserting the inflow port 2a and the outflow port 2b of the infusion tube 2 on X ', and a second case member 9 for inserting the infusion tube 2 communicating with the inflow port 2a and the outflow port 2b in, for example, a U-shape. And a forming member in which a storage chamber 7c for storing the drive operation device 12 is formed. The second case member 9 has a semicircular U-shaped groove 9a protruding in a cantilever shape on the support portion 7d of the base 7.
And a locking plate 9b extending in a plate shape in the diameter direction.

The transport tube 2 is a tube made of a soft elastic material such as polyethylene or silicone rubber. The outer peripheral surface of the infusion tube 2 is formed by a U-shaped groove 9 of the second case member 9.
a is inserted without a gap into the parallel portion of FIG. Second
The infusion tube 2 in which the lower radius portion is inserted into the U-shaped groove 9a of the case member 9, slides while engaging the upper radius portion from the Y 'side on the illustrated YY' axis with the locking plate 9b. First case member 8
It is inserted inside.

FIG. 3 is a plan view for explaining the first case member 8, which is a U-shaped member for fixing the infusion tube 2 in cooperation with the second case member 9. A semi-circular groove 8d into which the upper radius portion of the tube 2 is inserted;
The outer peripheral surface of the infusion tube 2 is brought into contact with the locking plate 9a of the second case member 9 by engaging the locking portion 8c having a U-shaped cross section provided on the diameter of the semicircular groove 8d with the semicircular groove 8d. 9a. The semicircular groove 8d is connected by a plate-shaped pressing portion 8b, and the opening has insertion portions 8a, 8a. Further, when the insertion portions 8a, 8a are inserted into the support holes 7a, 7a of the base 7, the plate-shaped pressing portion 8b becomes a bottom portion parallel to the axis XX 'of the infusion tube 2 bent in a U-shape. Press the upper surface of 7c. After the first case member 8 is inserted and supported in the base 7 as described above, the fixing screw 14 is screwed into the screw hole 8e of the insertion portion 8a.
Then, the first case member 8 and the second case member 9 and the base 7 are integrally fixed to each other by being inserted into the support holes 7a.

A drive unit 10 and a pair of displacement sensors 11 are fixed between the base 7 and the second case member 9. The drive unit 10 includes, for example, a yoke 10a and a coil 10
b. The yoke 10a is a disk made of a magnetic material such as permalloy, and is located at the center of the second case member 9, that is, the axis YY '.
The coil 10b is fixed to the upper surface of the substrate 7 corresponding to the yoke 10a. The displacement sensor 11 includes, for example, a magnet and a coil, and an output proportional to each velocity displacement is obtained from the coil. A displacement signal is obtained by integrating the output.

The coil 10b of the drive unit 10 is driven by an oscillator (not shown) provided in the drive arithmetic unit 12. The infusion tube 2 is driven together with the first case member 8 and the second case member 9 in a cantilever shape around the axis XX ′ by the drive of the drive unit 10. At the same time, the pair of displacement sensors 11, 11 generate Coriolis forces of opposite phases with respect to the axis YY '. This Coriolis force is an amount proportional to the mass flow rate of the drug solution flowing in the infusion tube 2 if the driving frequency is constant.
Is measured as the mass flow rate of the chemical solution and output via the transmission line 13. At this time, the essential parts are sealed with the cover 15.

The dosage of the drug solution is transmitted via a transmission line 13 to, for example, a nurse center or the like, informing that a predetermined amount of the drug solution has been injected. Based on this notification, the nurse removes the infusion needle 5 from the patient, removes the first case member 8 by pulling out the fixing screw 14, removes the first case member 8 together with the infusion tube 2 from the medical Coriolis flow meter, and discards it in a safe place. . Then, the new infusion tube 2 is guided into the groove of the second case member 9, pressed by the first case member 8 and fixed by the fixing screw 14, so that the administration can be easily started.

Although the infusion tube 2 is fixed in the first and second case members 8 and 9 in the above description, the infusion tube 2 may be simply inserted into a U-shaped hollow tube, and may be bent into a U-shape. Instead, a fixed tube may be supported at both ends and may be a medical Coriolis flowmeter having a structure for detachably supporting and pressing the infusion tube 2.

[0016]

[Effect] As is clear from the above description, the infusion tube for inserting the infusion needle into the patient and dispensing the medicinal solution can be easily removed from the Coriolis flowmeter for medical use. Since no skill is required, anyone can handle it, and the dosage can be accurately measured as a mass flow rate that is not affected by the temperature of the drug solution, so that safe and effective dosing can be performed. it can.

[Brief description of the drawings]

FIG. 1 is a view showing a dispensing device for explaining a use portion relationship of a medical Coriolis flow meter according to the present invention.

FIGS. 2A and 2B are diagrams for explaining an example of the structure of a medical Coriolis flowmeter according to the present invention.

FIG. 3 is a plan view for explaining a first case member 8;

FIG. 4 is a diagram showing a configuration of a conventional infusion set.

[Explanation of symbols]

1. Coriolis flow meter for medical use 2. Infusion tube,
3 ... rubber tube, 4 ... octopus tube, 5 ... infusion needle, 7 ... base, 8 ...
1st case member, 9 ... 2nd case member, 10 ... drive part,
11 is a displacement sensor, 12 is a drive arithmetic unit, 13 is a transmission unit, 14 is a fixing screw, and 15 is a cover.

Claims (1)

(57) [Claims] 1. A case member which detachably mounts an infusion tube and presses and supports a predetermined section in the longitudinal direction of the infusion tube so that an outer peripheral surface thereof is in close contact with the base member, and a base which vibrates and supports the predetermined section of the case member. A drive unit for reciprocatingly driving the infusion tube at right angles to the longitudinal direction in the middle of the predetermined section between the base and the case member, and a Coriolis force acting on the infusion tube at an intermediate portion and a support portion of the infusion tube a pair of displacement sensors for detecting a Coriolis force is detected by the displacement sensor consists of a mass flow rate measuring means for detecting a difference signal of the displacement sensor, before
The case member is cantilevered by the base, and
The infusion tube is opened at the inlet and outlet
A second case that has a semicircular groove that is guided in a U-shape and that is open at the top
And the second member is detachably fixed to the base.
Cooperating with the base member, the parallel portion of the U-shaped infusion tube
The semicircular groove and the lower surface opening for pressing and locking the outer peripheral surface
And a flat plate portion for pressing and supporting the infusion tube.
A medical Coriolis flowmeter characterized by comprising a case member .