JPH0523308A - Flow controller and blood pressure measuring apparatus - Google Patents

Abstract

PURPOSE:To achieve an elimination of overloading and moreover, a reverse flowing possible in priming by removing or relaxing a shielding at a side end of an outlet path of a communication path when a fluid to be introduced at an inlet path reaches a specified pressure to allow the passing of the fluid from the inlet path to the outlet path. CONSTITUTION:When a syringe pump 51 is driven, a transfusion reaches a communication path 5 via an inlet path 4 of a first tubular member 2 through a tube 52. An opening at a side end 71 of an outlet path of the communication path 5 is shielded by a specified pressing force with a skirt part 82 of a sealing member 8 and hence, the syringe pump 51 is driven to further supply into the inlet path 4 and the communication path 5, eventually increasing the pressure of the transfusion. As a result, the skirt part 82 is pushed outward against the pressing force to release the shielding at the side end 71 of the outlet path. In addition, a fine gap between the inner circumferential surface of the skirt part 82 and the outer circumferential surface of a discharge part 3. Thus, the transfusion in the communication path 5 flows into the outlet path 10 through the gap.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control device used for open blood pressure measurement and a blood pressure measurement device including the same.

[0002]

2. Description of the Related Art In the medical field, invasive blood pressure measurement is performed when anesthesia or intensive care management is performed, but this blood pressure measurement facilitates circulatory respiration control of a patient. It is said to be indispensable for proceeding, and its measurement system has been widely used.

This measuring system (blood pressure measuring device) basically prevents the invasion of blood into the circuit by continuously supplying a minute amount of infusion solution such as physiological saline or heparinized physiological saline to the system. An infusion solution supply circuit, a catheter that is pierced and inserted into a blood pressure measurement site of a patient, a pressure transducer that detects a blood pressure value using an infusion solution filled in the catheter as a transmission medium, and an output from the pressure transducer. A display recording device for displaying and recording the pressure value.

In this case, there are the following two methods for continuously supplying the infusion solution in the infusion solution supply circuit.

Method using pressurized cuff and bag containing soft saline solution Method using syringe pump (or infusion pump)

By the way, in the measuring system, when the pressure change of the infusion liquid in the catheter is detected by the pressure transducer, the influence of unnecessary external force, the influence of the compliance of the infusion liquid supply circuit, etc. are removed, and the pressure of the infusion liquid is adjusted. A flow control device is provided for accurate measurements.

This flow control device is arranged in a pipe line that connects the syringe pump and the catheter in the infusion solution supply circuit, and has a small inner diameter of a capillary tube (resistor) provided in the flow path of the flow control device. By flowing the infusion solution through the through hole, the flow velocity of this infusion solution is stabilized.

Further, when using a catheter, it is necessary to completely eliminate the air in the catheter, and for that reason, infusion is flushed into the catheter in advance and so-called priming is performed. For this reason, generally, the flow control device is provided with a flush mechanism that opens the flush flow path so that a large amount of liquid flows temporarily.

In this case, when the above method is adopted, the priming operation and the like can be performed with almost no problem even if the conventional flow control device is used, but when the above method is adopted, the following problems occur. There is.

First, when flushing is performed during priming or the like, the flush mechanism must be operated while operating the syringe pump to supply the infusion solution at a relatively high flow rate (so-called "fast forward"). Both hands are closed and the operation is complicated.

Secondly, since the infusion solution is supplied through the through hole having a small inner diameter of the capillary which is the resistor, it is necessary to secure the fluid pressure between the syringe pump and the flow control device to be substantially 300 mmHg or more. is there. Therefore, it is necessary to adjust the flow rate of the infusion solution to a flow rate during continuous supply, for example, 1 m1 / h after operating the syringe pump to fast-forward, and the operation is complicated.

In order to solve such a problem, the applicant of the present application discloses a flow control device capable of opening the flush flow path only by the fast-forward operation of the syringe pump without artificially operating the flush mechanism. (JP-A-1-171527).

This flow control device is a flow control device that is incorporated in a measurement system for blood pressure or the like and controls the amount of a fluid such as an infusion solution, which has an inlet passage for fluid and an outlet passage for fluid. The inlet passage and the outlet passage are communicated with each other via a communication passage having a cross-sectional area smaller than that of each passage, and an elastic body is arranged at an end of the communication passage on the outlet passage side, and the outlet passage is formed by the elastic body. When the fluid introduced from the inlet passage has a predetermined pressure by closing the side end portion, the elastic body is pressed to open the outlet passage end portion, and the fluid flows from the inlet passage to the outlet passage. The flow control device is characterized in that it is configured to. "

With this flow control device, the time and labor required for priming can be reduced, but the following problems occur.

When fast-forwarding is performed with a syringe pump, the internal pressure of the syringe increases as the volume of the syringe increases. For example, when a syringe having a volume of 50 ml is set in a syringe pump and a fast-forward operation is performed for priming, the pressure of the infusion solution increases due to the resistance due to the tension of the elastic body serving as a valve, and the syringe pump is operated. This causes a so-called overload condition and causes an inconvenience such as activation of an alarm.

Further, if the elastic body completely seals the outlet side end of the communication passage, it becomes impossible to move the fluid from the blood pressure measurement circuit side to the infusion supply circuit side via the flow control device. Should air remain on the exit passage side,
There is a drawback that the operation such as once pulling back the infusion solution to the syringe side to perform repriming cannot be performed.

[0017]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the conventional flow control device, and its purpose is not to cause an overload condition during priming, and to prevent reverse flow. It is to provide a flow control device and a blood pressure measurement device that enable the above.

[0018]

The above objects are achieved by the present invention described in (1) to (9) below.

(1) An inlet passage through which a fluid is introduced, an outlet passage through which a fluid is discharged, the inlet passage and the outlet passage are communicated with each other, have a smaller cross-sectional area than those passages, and are located on the outlet passage side. The fluid introduced from the inlet passage has a predetermined pressure, and the communication passage includes a portion that widens toward the end portion, and a seal member that substantially shields the outlet passage-side end portion of the communication passage. Then, the shielding of the end portion of the communication passage on the outlet passage side is released or relaxed by the seal member, and the flow control device operates so that the fluid flows from the inlet passage to the outlet passage.

(2) The first tubular member having the inlet passage formed therein and having a bulging portion at a tip end thereof is fitted into the first tubular member so as to surround the bulging portion, A second tubular member that defines the outlet passage with the bulging portion, the communication passage formed in the bulging portion, and a sealing member made of an elastic material capped on the bulging portion. The flow control device according to (1) above, which is configured.

(3) A protrusion is formed on the bulge,
An engagement hole is formed at one end of the seal member, and when the seal member is capped with the bulge portion, the seal member is bulged by engaging the engagement hole with the protrusion. The flow control device as described in (2) above, which is fixed to a section.

(4) The communication passage formed in the bulging portion has one end communicating with the inlet passage and the other end opening to the outer periphery of the bulging portion. Flow control device.

(5) The sealing member has a tubular skirt portion, and the skirt portion is installed in a tensioned state so as to be in close contact with the outer peripheral surface of the bulging portion. (2) to (4)
The flow control device according to any one of 1.

(6) The flow control device according to (5), wherein the skirt portion is provided with a cut.

(7) The above-mentioned (5) or (6), wherein a ridge or a groove for forming a flow path is provided on the outer peripheral surface of the bulging portion and / or the inner peripheral surface of the skirt portion. Flow control device.

(8) The flow control device according to any one of (1) to (7), the infusion supply circuit connected to the upstream side of the flow control device, and the downstream side of the flow control device. A blood pressure measuring device characterized by combining the blood pressure measuring circuit and a pressure transducer provided in the blood pressure measuring circuit.

(9) The flow control device according to any one of (1) to (7) above, an infusion supply circuit connected to the upstream side of the flow control device, and a downstream side of the flow control device. Blood pressure measuring device, a pressure transducer provided in the blood pressure measuring circuit, and a blood pressure waveform display device connected to an end of the blood pressure measuring circuit. .

[0028]

According to the present invention, in a flow control device used for invasive blood pressure measurement, an inlet passage, an outlet passage, and both passages are communicated with each other, have a smaller cross-sectional area than both passages, and face an outlet side end portion. Since it is composed of a communication passage that is widened and a seal member that substantially shields the end portion on the outlet side of the communication passage, a complicated operation at the time of flushing when performing priming using a syringe pump can be performed. And the syringe pump will not be overloaded.

That is, the infusion solution supplied from the syringe pump flows in through the inlet passage, is pressurized by the syringe pump, passes through the communication passage, reaches the end portion on the outlet passage side, and opens at the end portion on the outlet passage side. The seal member that closes and closes is pressed to reach the outlet passage through a minute gap formed therein (see FIG. 3).

When the sealing member is pressed, since the communication passage is provided with a portion that widens toward the end portion on the outlet passage side, the area where the infusion solution presses the sealing member during fast-forwarding during priming. Becomes larger, that is,
The seal member is pressed with a large force. As a result, a gap through which the infusion solution passes is reliably formed, and the gap is also large to some extent, so that the fluid resistance of the infusion solution passing through the gap can be reduced, the load on the syringe pump at the time of fast-forwarding can be reduced, and an overload state can be avoided. can do.

Further, when the skirt portion of the seal member is provided with a notch, the caulking force (elastic force) of the seal member can be alleviated and the gap can be further enlarged. The resistance of can be further reduced.

Further, when the outer peripheral surface of the bulging portion and / or the inner peripheral surface of the skirt portion is provided with a ridge or a groove as a means for forming a flow path, the bulging portion and the covered portion are covered. Since a minute gap is always formed between the sealing member and the sealing member, the infusion solution can flow in the opposite direction.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The flow control device and blood pressure measuring device of the present invention will be described below in detail with reference to the preferred embodiments shown in the accompanying drawings.

FIG. 1 shows a blood pressure measuring device incorporating the flow control device of the present invention. As shown in the figure, the blood pressure measurement device 50 has a syringe pump 51 for continuously supplying a fluid, for example, an infusion solution such as physiological saline, to the syringe pump 51 via a tube 52 for flow control. The upstream side of the device 1 is connected. The syringe pump 51, the tube 52, and the flow control device 1 thus configured constitute an infusion solution supply circuit that supplies an infusion solution.

As will be described later, the downstream side of the flow control device 1 is branched, and a three-way stopcock 54 is connected to one of the downstream sides via a tube 53, and the three-way stopcock 54 is also connected. A catheter 56 to be inserted into and inserted into a blood vessel of a patient 60 is connected to the tube via a tube 55. The tube 53, the three-way stopcock 54, the tube 55, and the catheter 56 constitute a blood pressure measurement circuit.

A pressure transducer 57 is connected to the other downstream side of the flow control device 1, and a blood pressure waveform display device 59 is connected to the pressure transducer 57 via an electric connection cable 58.

The display device 59 displays or further records the blood pressure waveform obtained by the measurement.

Next, the flow control device of the present invention will be described.

FIG. 2 is an exploded perspective view showing a structural example of the flow control device of the present invention, and FIG. 3 is a vertical sectional view of the flow control device shown in FIG.

As shown in these figures, the flow controller 1
Is basically a first tubular member 2, a second tubular member 9,
It is composed of a seal member 8.

The first tubular member 2 has a bulge 3 at the tip thereof.
And an inlet passage 4 for introducing an infusion solution is formed therein.

On the side of the bulging portion 3, a communication passage 5 penetrating from the inlet passage 4 in the bulging portion 3 toward the outer peripheral surface of the bulging portion 3.
Are formed. The inlet passage 4 and the outlet passage 10 communicate with each other via the communication passage 5.

The connecting passage 5 has a straight pipe portion 6 and an expanding portion 7 that expands toward the end portion 71 of the infusion solution outlet passage.
The cross-sectional area of each part of the communication passage 5 is smaller than the cross-sectional area of the inlet passage 4 and the outlet passage 10 described later.

The inner diameter of the straight pipe portion 6 in the communication passage 5 is
It is preferable that the diameter is about 0.2 to 1 mm, particularly about 0.3 to 0.5 mm, and the maximum inner diameter of the expansion portion 7 (the outlet passage side end portion 7
1 opening diameter) is about 1-2 mm, especially 1.3-1.6
It is preferably about mm.

The opening at the end 71 on the outlet passage side is not limited to a circular shape, but may be an elliptical shape, a polygonal shape, or the like.

The bulging portion 3 is capped with a cup-shaped seal member 8 so as to shield the outlet passage side end 71 of the communication passage 5 with a skirt portion 82 forming the outer periphery thereof. There is. The seal member 8 has a function of adjusting the flow rate or pressure of the infusion solution.

The skirt portion 82 is made of a thin tubular member, and its inner diameter is preferably set to a value slightly smaller than the outer diameter of the bulging portion 3. As a result, the skirt portion 82 is installed in a tensioned state on the outer periphery of the bulging portion 3 and is in close contact with the outer peripheral surface of the bulging portion 3.

An engagement hole 81 is formed at the center of the top of the seal member 8. The engagement hole 81 is formed by the bulging portion 3
It is fitted with a mushroom-shaped protrusion 31 formed on the top of the, so that the seal member 8 is fixed to the bulging portion 3.

As described above, by fitting the engaging hole 81 to the protrusion 31 formed on the bulging portion 3 and attaching the seal member 8, the seal member 8 is prevented from being displaced and is securely fixed. You can

As a constituent material of the seal member 8,
Examples thereof include elastic materials and soft materials such as natural rubber, isoprene rubber, styrene rubber, butadiene rubber, silicone rubber, polyvinyl chloride, polyurethane and the like.

The skirt portion 82 of the seal member 8 has a thickness of about 0.1 to 1 mm, preferably about 0.3 to 0.5 mm, although it depends on the constituent materials.

The skirt portion 82 of the seal member 8 as described above.
As shown in FIG. 2, a part of the notch (slit)
It is preferable that 83 is formed. Thereby, the caulking force of the seal member 8 can be relaxed and adjusted.

The cuts 83 may be provided at two or more places on the skirt portion 82.

An inlet 41 is formed in the inlet passage 4 on the base end side of the first tubular member 2, and the inlet 41 is formed.
The vicinity is tapered.

Further, an engaging portion (luer lock) 21 projecting like a collar is formed on the outer peripheral portion of the inflow port 41, and a male connector having a taper corresponding to the taper near the inflow port 41 (not shown). By engaging with the engaging portion 21, the () is inserted into the inflow port 41 and connected.

The second tubular member 9 is liquid-tightly fitted to the first tubular member 2 so as to surround the periphery of the bulging portion 3. Thereby, the outlet passage 10 is defined between the inner surface of the second tubular member 9 and the bulging portion 3.

The fitting portion 11 of both tubular members 2 and 9 is
Bonding with an adhesive (solvent) or fusion (heat fusion,
It is preferable to join them by ultrasonic fusion.

The constituent materials of the first tubular member 2 and the second tubular member 9 are polycarbonate, rigid polyvinyl chloride, polyester such as polyethylene terephthalate (PET), and polybutylene terephthalate (PBT),
Polystyrene, polymethylmethacrylate (PMM
A), relatively hard resin such as polysulfone (PSF), various ceramics such as glass, alumina, silica,
Examples include metals such as stainless steel.

Further, the constituent material of the first tubular member 2 and the second tubular member 9 is preferably transparent in order to confirm residual bubbles.

At the tip of the second tubular member 9, a T-shaped tube 12 is provided.
Of the outlet passage 1 is connected to the first port 13 of
0 and the flow path 16 in the T-shaped tube 12 communicate with each other.

The second port 14 of the T-shaped tube 12 has
The tube 53 is connected directly or via a connector (not shown), and the pressure transducer 57 is connected to the third port 15.

4 to 7 show enlarged examples of the structure in the vicinity of the communication passage in the flow control device of the present invention.

In the example shown in FIG. 4 and FIG. 5, on the outer periphery of the bulging portion 3, a protruding strip 33 extending from the end 71 on the outlet passage side toward the base end side of the bulging portion 3 is formed to project. Has been done.
The ridges 33 function as spacers, and by forming the ridges 33, the flow of the infusion liquid is provided between the outer peripheral surface of the bulging portion 3 and the inner peripheral surface of the skirt portion 82 of the seal member 8. A gap is formed to serve as a passage.

The size of the ridge 33 is not particularly limited, but the width is 0.02 to 0.15 mm, especially 0.04 to 0.08 mm.
The height is preferably 0.02 to 0.15 mm, particularly 0.04 to 0.08 mm, and the length is 1 to 5 mm, particularly 2.5 to 3.5 mm. Preferably.

As shown in the figure, it is preferable that the end point (the lower end in the figure) of the ridge 33 is exposed from the lower end of the skirt portion 82.

In the example shown in FIGS. 6 and 7, a groove 35 extending from the end 71 on the outlet passage side to the base end side of the bulging portion 3 is formed on the outer periphery of the bulging portion 3. There is. This groove 35 serves as a flow path for infusion.

The size of the groove 35 is not particularly limited, but the width is preferably 0.01 to 0.1 mm, particularly preferably 0.03 to 0.07 mm, and the depth is 0.01 to 0.1 mm, especially ,
The length is preferably 0.03 to 0.07 mm, and the length is 1
.About.5 mm, particularly preferably 2.5 to 3.5 mm.

As shown in the drawing, the end point of the groove 35 (lower end in the drawing) is preferably exposed from the lower end of the skirt portion 82.

By forming the projections 33 and the grooves 35 as described above, the inlet passage 4 to the outlet passage 1 can be formed with a relatively low hydraulic pressure.
It is possible to secure the flow of the infusion solution to 0, the resistance when the infusion solution flows is also stable, and it is also possible to reverse the infusion solution in order to remove the air and the infusion solution in the outlet passage 10, for example. Become.

When the ridges 33 and the grooves 35 are formed as described above, the skirt portion 82 does not completely seal the opening of the outlet passage side end 71, but the ridges 33 and the grooves 35 are formed as described above. Due to the size, the outlet passage side end portion 71 of the communication passage 5 is substantially shielded, and the ridge 33 and the groove 35 suppress the compliance on the infusion supply circuit side, which adversely affects the blood pressure measurement circuit. Does not occur, and inconveniences such as excessive infusion of the infusion solution during priming do not occur.

The ridges 33 and the grooves 35 are formed in the bulge 3
It may be provided at two or more locations on the outer periphery of the.

Further, unlike the illustration, the ridge 33 and the groove 35 are
It may be provided on the inner peripheral surface of the skirt portion 82.

Next, the operation of the flow control device 1 and the blood pressure measurement device 50 of the present invention will be described.

As shown in FIG. 1, in the blood pressure measuring device 50, so-called priming is performed after the connection work of each circuit is completed and before the blood pressure is actually measured.

That is, first, when the operator drives the syringe pump 51, the infusion solution supplied from the syringe pump 51 reaches the communication passage 5 via the tube 52, the inlet passage 4 of the first tubular member 2. At this time, the flow rate of the infusion solution supplied is about 400 to 800 ml / h, which is larger than the flow rate (0.5 to 3 ml / h) at the time of normal blood pressure measurement, which is so-called fast-forward.

The opening at the end 71 on the outlet passage side of the communication passage 5 is shielded by the skirt portion 82 of the seal member 8 with a predetermined pressing force, and the syringe pump 51 is driven to drive the inside of the inlet passage 4 and the communication passage 5. When the infusion solution is further supplied to the skirt to increase the pressure of the infusion solution, the skirt portion 82 is pressed outward against the pressing force, the shield of the outlet passage side end portion 71 is released (or relaxed), and the skirt portion is released. A minute gap (for example, a thickness of 0.0) between the inner peripheral surface of 82 and the outer peripheral surface of the bulging portion 3.
05-0.05 mm) is formed.

Therefore, the infusion liquid in the communication passage 5 flows into the outlet passage 10 through this gap.

At this time, since the communication passage 5 has the expanded portion 7, a larger force acts on the skirt portion 82 with respect to a predetermined hydraulic pressure, so that the above-mentioned gap is surely formed. . As a result, for example, even when the syringe of the syringe pump 51 has a large capacity (for example, about 50 ml), it is not overloaded.

The infusion solution that has flowed into the outlet passage 10 is a T-shaped tube 1.
It is introduced into the flow channel 16 in the T-shaped tube 12 from the second first port 13, and is further filled in the tube 53, the three-way stopcock 54, the tube 55, and the catheter 56. In addition, a part of the infusion solution is supplied to the catheter 56 along with the air in the circuit.
Is discharged from the tip of the.

In this way, priming is completed.

In particular, when the flow control device having the structure shown in FIGS. 4 to 7 is used, the outlet passage 1 of the flow control device 1 should be used.
Syringe pump 51
Alternatively, by connecting a syringe and pulling the plunger of the syringe, the infusion solution and residual air in the outlet passage 10 can be sucked and removed, and the priming can be performed again. That is, since the ridge 33 and the groove 35 are installed, a minute gap is always formed between the bulging portion 3 and the skirt portion 82 of the seal member 8.
0, the gap, the communication passage 5, and the inlet passage 4 can be backflowed in this order, and the re-priming can be performed.

Since the backflow of the infusion solution is not more than necessary, it does not adversely affect the measurement accuracy and the like.

Next, the catheter 56 is punctured into a predetermined portion of the artery or vein of the patient 60, and the desired blood pressure is measured. That is, as described above, when the syringe pump 51 is operated, the infusion solution supplied from the syringe pump 51 becomes the tube 1
3, the flow control device 1, the T-tube 12, the tube 53, the three-way stopcock 54, the tube 55, and the catheter 56 are sequentially passed, and then injected into the blood vessel of the patient 60.

At this time, the infusion solution has a constant flow rate (for example, 0.5 to 3) by the flow control device 1 and the syringe pump 51.
(ml / h) is controlled and supplied.

In such a process, the blood pressure of the patient 60 is detected by the pressure transducer 57 using the infusion fluid such as the catheter 56, the tube 55, the three-way stopcock 54, the tube 53 and the T-shaped tube 12 as a transmission medium. 57 outputs a voltage proportional to the pressure to the display device 59. As a result, the blood pressure value of the patient 60 is displayed (or displayed and recorded) on the display device 59 in real time.
To be done.

In this case, if the flow control device 1 is to control the flow rate of the infusion solution to 3.0 ml / h, for example, the fluid pressure on the inlet passage 4 side of the flow control device 1 may be 30 mmHg or less. Therefore, as compared with the conventional one in which the fluid pressure on the upstream side of the flow control device is set to 300 mmHg, the preparation time after the priming work can be significantly shortened, and an efficient blood pressure measurement work can be performed. It becomes possible.

In addition, the priming work does not require the operator to substantially operate the flow control device 1, so that the priming work can be further simplified and the burden on the operator can be reduced.

Further, since the minute gap formed between the skirt portion 82 of the seal member 8 and the bulging portion 3 functions as a resistor, for example, pressure fluctuation caused by the driving of the syringe pump 51. There is an advantage that a highly accurate pressure measurement can be performed without being affected by the above.

[0089]

As described above, according to the present invention, operability in priming and subsequent measurement preparation work can be improved.

Since the communication passage is provided with the expanding portion which expands toward the end portion on the outlet passage side, the inflow resistance at the time of rapid feeding by the syringe pump can be reduced, and the syringe pump is overloaded. Is prevented. In particular, by appropriately selecting the opening area of the end portion on the outlet passage side of the expanded portion, the constituent material of the seal member, the thickness of the skirt portion, the presence or absence of cuts and their sizes, the presence or absence of ridges or grooves and their sizes, etc. Even if the differential pressure between the inlet passage and the outlet passage is relatively small, the shielding by the seal member can be released and the two passages can be communicated with each other.

When a ridge or a groove is formed on the bulging portion, a flow path is always formed between the bulging portion and the seal member, so that the backward flow of the infusion solution is possible and repriming or the like is possible. Can be done with.

Further, according to the present invention, since the pressure fluctuation and the like generated due to the driving of the syringe pump and the like are absorbed, the blood pressure can be measured with high accuracy.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram showing a configuration example of a blood pressure measurement device of the present invention.

FIG. 2 is an exploded perspective view showing a configuration example of a flow control device of the present invention.

3 is a vertical cross-sectional view of the flow control device shown in FIG.

FIG. 4 is an enlarged front view showing another configuration example in the vicinity of the communication passage in the flow control device of the present invention.

5 is a cross-sectional view taken along the line AA in FIG.

FIG. 6 is an enlarged front view showing still another configuration example in the vicinity of the communication passage in the flow control device of the present invention.

7 is a sectional view taken along line BB in FIG.

[Explanation of symbols]

1 Flow control device 2 First tubular member 21 Engagement part 3 bulge 31 protrusion 33 convex stripes 35 groove 4 entrance passages 41 Inlet 5 connecting passages 6 Straight pipe section 7 Expansion section 71 Exit passage side end 8 Seal part 81 Engagement hole 82 Skirt 83 notches 9 Second tubular member 10 exit passage 11 Fitting part 12 T-tube 13 1st port 14 Second port 15 3rd port 16 channels 50 Blood Pressure Measuring Device 51 syringe pump 52, 53 tubes 54 Three-way stopcock 55 tubes 56 catheter 57 Pressure Transducer 58 electrical connection cable 59 display device 60 patients

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Satoru Hashimoto             16-4 Annocho, Ichijoji, Sakyo-ku, Kyoto-shi, Kyoto Prefecture

Claims (9)

[Claims] 1. An inlet passage for introducing a fluid, an outlet passage for discharging the fluid, a passage for communicating the inlet passage and the outlet passage, and a cross-sectional area smaller than those passages, and an end on the outlet passage side. When the fluid introduced from the inlet passage has a predetermined pressure, the connecting passage includes a portion that widens toward the portion and a seal member that substantially shields the outlet passage-side end portion of the connecting passage. The flow control device is operated so that the shielding of the end portion of the communication passage on the outlet passage side is released or relaxed by the seal member, and the fluid flows from the inlet passage to the outlet passage. 2. A first tubular member having the inlet passage formed therein and having a bulging portion at a tip portion, and the first tubular member fitted to surround the periphery of the bulging portion, A second defining the outlet passage with the outlet
The flow control device according to claim 1, comprising a tubular member, the communication passage formed in the bulging portion, and a seal member made of an elastic material capped in the bulging portion. 3. A protrusion is formed on the bulging portion, and an engagement hole is formed on one end of the seal member, and the engagement hole is formed when the seal member is capped with the bulging portion. The flow control device according to claim 2, wherein the seal member is fixed to the bulging portion by engaging a protrusion with the protrusion. 4. The flow control device according to claim 2 or 3, wherein one end side of the communication passage formed in the bulging portion communicates with the inlet passage, and the other end side opens to the outer periphery of the bulging portion. . 5. The sealing member according to claim 2, wherein the sealing member has a tubular skirt portion, and the skirt portion is installed in a tensioned state so as to be in close contact with the outer peripheral surface of the bulging portion. The described flow control device. 6. The flow control device according to claim 5, wherein the skirt portion is provided with a notch. 7. The flow control device according to claim 5, wherein a ridge or a groove for forming a flow path is provided on an outer peripheral surface of the bulging portion and / or an inner peripheral surface of the skirt portion. 8. The flow control device according to claim 1, an infusion supply circuit connected to an upstream side of the flow control device, and a blood pressure measurement connected to a downstream side of the flow control device. Blood pressure measuring device characterized by combining a pressure measuring circuit and a pressure transducer provided in the blood pressure measuring circuit. 9. The flow control device according to claim 1, an infusion supply circuit connected to an upstream side of the flow control device, and a blood pressure measurement connected to a downstream side of the flow control device. A blood pressure measuring device comprising: a blood pressure measuring circuit; a pressure transducer provided in the blood pressure measuring circuit; and a blood pressure waveform display device connected to an end of the blood pressure measuring circuit.