JP2999025B2 - Flow control device and blood pressure measurement device - Google Patents

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 invasive blood pressure measurement and a blood pressure measurement device provided with the flow control device.

[0002]

2. Description of the Related Art In the medical field, when performing anesthesia or intensive care management, invasive arterial pressure measurement is performed. This invasive arterial pressure measurement facilitates circulatory respiration management of a patient. It is essential to proceed, and its measurement system has been widely used.

This measurement system (blood pressure measurement device) basically supplies a small amount of an infusion such as physiological saline or heparinized saline to the system to prevent blood from entering the circuit. An infusion supply circuit, a catheter pierced and inserted into the blood pressure measurement site of the patient, a pressure transducer for detecting a blood pressure value using the infusion 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 an infusion in the infusion supply circuit.

A method using a pressurized cuff and a bag containing soft saline A method using a syringe pump (or infusion pump)

By the way, when a pressure change of an infusion in a catheter is detected by a pressure transducer, an unnecessary influence of external force, an influence of compliance of an infusion supply circuit, and the like are removed. For accurate measurement, a flow control device is provided.

This flow control device is disposed in a conduit connecting a syringe pump and a catheter in an infusion supply circuit, and has a small inner diameter of a capillary (resistor) provided in a flow path of the flow control device. The flow rate of the infusion is stabilized by flowing the infusion through the through hole.

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

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

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

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

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

This flow control device is a flow control device incorporated in a measurement system for blood pressure and the like for controlling the amount of a fluid such as an infusion fluid. The flow control device has an inlet passage and an outlet passage for a fluid. The inlet passage and the outlet passage communicate with each other via a communication passage having a smaller cross-sectional area than each of the passages, and an elastic body is provided 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 is closed at a predetermined pressure, the elastic body is pressed to open the outlet passage side end, and the fluid flows from the inlet passage to the outlet passage. The flow control device is characterized in that the flow control device 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 by a syringe pump, the internal pressure of the syringe increases as the syringe capacity increases. For example, when a syringe having a capacity of 50 ml is set in a syringe pump and a fast-forward operation is performed for priming, the pressure of the infusion is increased 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 state, which causes an inconvenience such as an alarm being activated.

Further, if the elastic body completely seals the end of the communication passage on the outlet side, it is impossible at all 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 in that an operation such as drawing back the infusion once to the syringe side and performing 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 has as its object to prevent overloading 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]

This and other objects are achieved by the present invention which is defined below as (1) to (9).

(1) An inlet passage for introducing a fluid, an outlet passage for discharging a fluid, the inlet passage and the outlet passage communicating with each other, having a smaller cross-sectional area than both of these passages, and A communication passage including a portion expanded toward the end, and a seal member that substantially shields an end of the communication passage on the side of the outlet passage, wherein a fluid introduced from the inlet passage has a predetermined pressure. Then, the shielding of the end of the communication passage on the outlet passage side by the seal member is released or relaxed, and the flow control device operates so that fluid flows from the inlet passage to the outlet passage.

(2) The inlet passage is formed inside, and a first tubular member having a bulging portion at a tip end is fitted to the first tubular member so as to surround the periphery of the bulging portion. A second tubular member defining the outlet passage with the bulging portion, the communication passage formed in the bulging portion, and a sealing member made of an elastic material covered by the bulging portion. The flow control device according to the above (1), which is configured.

(3) A projection is formed on the bulging portion,
An engagement hole is formed at one end of the seal member, and when the seal member is covered with the bulging portion, the seal member is bulged by engaging the engagement hole with the protrusion. The flow control device according to (2), wherein the flow control device is fixed to a part.

(4) The communication passage formed in the bulging portion has one end communicating with the entrance passage and the other end opening to the outer periphery of the bulging portion according to (2) or (3). Flow control device.

(5) The seal member has a cylindrical skirt portion, and the skirt portion is installed in a tension state so as to be in close contact with the outer peripheral surface of the bulging portion.
The flow control device according to any one of the above.

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

(7) The method according to (5) or (6), 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. Flow control device.

(8) The flow control device according to any one of (1) to (7), an infusion supply circuit connected upstream of the flow control device, and a flow control device connected downstream of the flow control device. A blood pressure measurement device, comprising a combination of the blood pressure measurement circuit provided and a pressure transducer provided in the blood pressure measurement circuit.

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

[0028]

The present invention relates to a flow control device used for invasive blood pressure measurement, wherein an inlet passage, an outlet passage, and both passages communicate with each other, have a smaller cross-sectional area than both passages, and are directed toward the outlet side end. It is composed of a communication passage that is widened and a seal member that substantially shields an end of the communication passage on the outlet side, so that a complicated operation during flushing when performing priming using a syringe pump is performed. And the syringe pump is not overloaded.

That is, the infusion supplied from the syringe pump flows in from the inlet passage, is pressurized by the syringe pump, passes through the communication passage, reaches the outlet passage side end, and is opened at the outlet passage side end. Is pressed to reach the outlet passage through a minute gap formed therein (see FIG. 3).

When the seal member is pressed, the communication passage is provided with a portion that expands toward the end of the outlet passage, so that the area where the infusion liquid presses the seal member during rapid feed during priming is provided. Becomes larger, that is,
The sealing member is pressed with a large force. As a result, the gap through which the infusion passes is reliably formed, the gap is somewhat large, the fluid resistance of the infusion passing through the gap can be reduced, the load on the syringe pump during rapid traverse can be reduced, and an overload state is avoided. can do.

When a cut is provided in the skirt portion of the seal member, the caulking force (elastic force) of the seal member can be reduced, and the gap can be further increased. Can be further reduced.

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

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a flow control device and a blood pressure measurement device according to the present invention will be described in detail based on 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 such as a physiological saline, and controls the flow of the syringe pump 51 via a tube 52. The upstream side of the device 1 is connected. The syringe pump 51, the tube 52, and the flow control device 1 constitute an infusion supply circuit for supplying an infusion agent.

The downstream side of the flow control device 1 is branched, as will be described later, and a three-way cock 54 is connected to one of the downstream sides via a tube 53. Is connected to a catheter 56 which is inserted into and inserted into a blood vessel of a patient 60 via a tube 55. The tube 53, the three-way cock 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 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 configuration example of the flow control device of the present invention, and FIG. 3 is a longitudinal sectional view of the flow control device shown in FIG.

As shown in these figures, the flow control device 1
Is basically a first tubular member 2, a second tubular member 9,
And a seal member 8.

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

A communication passage 5 penetrating from the entrance passage 4 in the bulging portion 3 toward the outer peripheral surface of the bulging portion 3 is provided on a side portion of the bulging portion 3.
Are formed. The entrance passage 4 and the exit passage 10 communicate with each other via the communication passage 5.

This communication passage 5 has a straight pipe portion 6 and an expanding portion 7 expanding toward an end portion 71 on the outlet passage side of the infusion solution.
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 an outlet passage 10 described later.

The inner diameter of the straight pipe portion 6 in the communication passage 5 is
It is preferably about 0.2 to 1 mm, particularly about 0.3 to 0.5 mm.
1 opening diameter) is about 1 to 2 mm, particularly 1.3 to 1.6 mm.
It is preferable to set it to about mm.

The opening at the outlet passage side end 71 is not limited to a circle, but may be an ellipse, a polygon, or the like.

Further, the bulging portion 3 is covered with a cup-shaped sealing member 8 so as to shield the end 71 on the outlet passage side of the communication passage 5 with a skirt 82 constituting an outer peripheral portion thereof. I have. The seal member 8 has a function of adjusting the flow rate or pressure of the infusion.

The skirt portion 82 is formed of a thin cylindrical member, and its inner diameter is preferably slightly smaller than the outer diameter of the bulging portion 3. As a result, the skirt portion 82 is installed in a tension state on the outer periphery of the bulging portion 3 and closely adheres to 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. This engagement hole 81 is
Is fitted to the mushroom-shaped protrusion 31 formed on the top of the seal member 8, whereby the seal member 8 is fixed to the bulging portion 3.

As described above, by fitting the engagement hole 81 into the projection 31 formed on the bulging portion 3 and attaching the seal member 8, the displacement of the seal member 8 is prevented, and the seal member 8 is securely fixed. Can be.

The constituent material of the seal member 8 is as follows.
For example, elastic materials or soft materials such as natural rubber, isoprene rubber, styrene rubber, butadiene rubber, silicone rubber, polyvinyl chloride, and polyurethane can be used.

The thickness of the skirt portion 82 of the sealing member 8 is preferably about 0.1 to 1 mm, particularly preferably about 0.3 to 0.5 mm, though it depends on the above-mentioned constituent materials.

The skirt portion 82 of such a sealing member 8
As shown in FIG. 2, a part of the notch (slit)
83 are preferably formed. Thereby, the caulking force of the seal member 8 can be reduced and adjusted.

Incidentally, such cuts 83 may be provided at two or more places of 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.
The vicinity has a tapered shape.

An engaging portion (luer lock) 21 which protrudes in a flange shape is formed on the outer peripheral portion of the inflow port 41, and has a male connector (shown in the drawing) having a taper corresponding to the taper in the vicinity of the inflow port 41. ) Is engaged with the engaging portion 21 to be fitted and connected to the inflow port 41.

The second tubular member 9 is fitted to the first tubular member 2 in a liquid-tight manner so as to surround the periphery of the bulging portion 3. Thereby, an 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 the two tubular members 2, 9 is
Adhesive (solvent) or fusion (thermal fusion,
It is preferable to perform joining by ultrasonic fusion or the like.

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

Further, the constituent materials of the first tubular member 2 and the second tubular member 9 are preferably transparent for confirming the residual bubbles.

At the tip of the second tubular member 9, a T-shaped tube 12
Of the outlet passage 1
0 communicates with the flow path 16 in the T-tube 12.

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

FIGS. 4 to 7 show enlarged examples of the configuration near the communication passage in the flow control device of the present invention.

In the example shown in FIGS. 4 and 5, on the outer periphery of the bulging portion 3, a protruding ridge 33 extending toward the base end side of the bulging portion 3 starting from the outlet passage side end portion 71 is formed. Have been.
The ridge 33 functions as a spacer. By forming the ridge 33, the flow of the infusion liquid 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 serving as a road is formed.

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

As shown in the figure, it is preferable that the end point (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 is formed on the outer periphery of the bulging portion 3 and extends from the outlet passage side end 71 toward the base end side of the bulging portion 3. I have. This groove 35 becomes a flow path of the infusion solution.

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, particularly ,
It is preferably 0.03-0.07 mm, and the length is 1
It is preferably from 5 to 5 mm, particularly preferably from 2.5 to 3.5 mm.

As shown in the figure, it is preferable that the end point (the lower end in the figure) of the groove 35 is exposed from the lower end of the skirt portion 82.

By forming such ridges 33 and grooves 35, the inlet passage 4 and the outlet passage 1 can be moved with relatively low hydraulic pressure.
In addition, it is possible to ensure the flow of the infusion to zero, and the resistance when the infusion circulates is stable. Further, it is possible to reverse the infusion so as to remove the air and the infusion in the outlet passage 10, for example. Become.

When the ridges 33 and the grooves 35 are formed, 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. By setting the size, the end 71 on the outlet passage side of the communication passage 5 is substantially shielded, and the compliance on the infusion supply circuit side is suppressed by the ridges 33 and the grooves 35, which adversely affects the blood pressure measurement circuit. And no inconvenience such as excessive distribution of the infusion during priming.

The ridge 33 and the groove 35 are not
May be provided at two or more locations on the outer periphery of the.

Also, unlike the illustration, the ridges 33 and the grooves 35
The skirt 82 may be provided on the inner peripheral surface.

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, after completing the work of connecting the circuits, so-called priming is performed prior to actually measuring the blood pressure.

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

The opening at the end 71 on the outlet passage side of the communication passage 5 is shielded by a predetermined pressing force by the skirt portion 82 of the seal member 8. The syringe pump 51 is driven to drive the inside of the entrance passage 4 and the inside of the communication passage 5. When the infusion is further supplied to the infusion to increase the infusion pressure, the skirt portion 82 is pressed outward against the pressing force, and the shielding of the outlet passage side end portion 71 is released (or relaxed). 82 and an outer peripheral surface of the bulging portion 3 (for example, a thickness of 0.0
(About 0.05 to 0.05 mm).

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

At this time, since the communication passage 5 has the widening portion 7, a larger force acts on the skirt portion 82 for a predetermined hydraulic pressure, so that the gap is reliably formed. . As a result, for example, even when the syringe of the syringe pump 51 has a large capacity (for example, about 50 ml), no overload occurs.

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

Thus, the 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.
When air remains in the inside of the syringe pump 51,
Alternatively, by connecting a syringe and pulling the plunger of the syringe, the infusion and residual air in the outlet passage 10 can be suctioned and removed, and priming can be performed again. In other words, a small gap is always formed between the bulging portion 3 and the skirt portion 82 of the sealing member 8 due to the provision of the ridges 33 and the grooves 35.
0, the gap, the communication passage 5 and the entrance passage 4 can be reversely flowed in this order, so that the repriming can be performed.

Since the backflow of the infusion is not an excessive amount, there is no adverse effect on 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 to perform a desired blood pressure measurement. That is, as described above, when the syringe pump 51 is operated, the infusion supplied from the syringe pump 51 is supplied to the tube 1.
3. Injected into the blood vessel of the patient 60 through the flow control device 1, the T-tube 12, the tube 53, the three-way stopcock 54, the tube 55 and the catheter 56 in order.

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

In such a process, the blood pressure of the patient 60 is detected by the pressure transducer 57 using the infusion such as the catheter 56, the tube 55, the three-way cock 54, the tube 53, and the T-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.
Is done.

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

Moreover, in the priming operation, the operator does not need to substantially operate the flow control device 1, so that the priming operation can be further simplified and the burden on the operator can be reduced.

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

[0089]

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

Further, by providing the communication passage with the expanding portion that expands toward the end on the outlet passage side, the inflow resistance at the time of rapid feed by the syringe pump can be reduced, and the syringe pump becomes overloaded. Is prevented. In particular, by appropriately selecting the opening area of the outlet passage side end of the expanded portion, the constituent material of the seal member, the thickness of the skirt, the presence or absence and size of cuts, the presence or absence of protrusions and grooves, and the size thereof. Even if the pressure difference 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 communicate with each other.

In the case where a ridge or a groove is formed in the bulging portion, a flow path is always formed between the bulging portion and the seal member. And can be done.

Further, according to the present invention, since pressure fluctuations and the like generated due to driving of the syringe pump and the like are absorbed, highly accurate blood pressure measurement can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view 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.

FIG. 3 is a longitudinal sectional view of the flow control device shown in FIG. 2;

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

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

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flow control device 2 1st tubular member 21 Engagement part 3 Swelling part 31 Projection part 33 Projection 35 Groove 4 Inlet passage 41 Inflow port 5 Communication passage 6 Straight pipe part 7 Expanding part 71 Exit passage side end part 8 Seal Part 81 engagement hole 82 skirt part 83 cut 9 second tubular member 10 outlet passage 11 fitting part 12 T-shaped tube 13 first port 14 second port 15 third port 16 flow path 50 blood pressure measurement device 51 syringe pump 52, 53 tube 54 three-way cock 55 tube 56 catheter 57 pressure transducer 58 electric connection cable 59 display device 60 patient

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Satoru Hashimoto 16-4 Ichijoji Annocho, Sakyo-ku, Kyoto-shi, Kyoto (58) Field surveyed (Int. Cl. ⁷ , DB name) A61B 5/00-5/03

Claims (9)

(57) [Claims] 1. An inlet passage for introducing a fluid, an outlet passage for discharging a fluid, an end passage on the outlet passage side, wherein the end passage communicates with the inlet passage and the outlet passage, has a smaller cross-sectional area than both of these passages. A communication passage including a portion expanded toward the portion, and a seal member for substantially shielding an end of the communication passage on the outlet passage side, and when a fluid introduced from the inlet passage has a predetermined pressure. The flow control device, wherein the sealing of the end of the communication passage on the outlet passage side by the seal member is released or relaxed, and the flow control device operates so that 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 distal end portion, the first tubular member being fitted to the first tubular member so as to surround a periphery of the bulging portion, and 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 sealing member made of an elastic material covered by the bulging portion. 3. A protrusion is formed on the bulging portion, an engaging hole is formed on one end of the seal member, and when the seal member is covered with the bulging portion, the engaging hole is formed. The flow control device according to claim 2, wherein the seal member is fixed to the bulging portion by engaging with the protrusion. 4. The flow control device according to claim 2, wherein one end of the communication passage formed in the bulging portion communicates with the entrance passage, and the other end of the communication passage opens to the outer periphery of the bulging portion. . 5. The sealing member according to claim 2, wherein the sealing member has a cylindrical skirt portion, and the skirt portion is installed in a tension state so as to be in close contact with the outer peripheral surface of the bulging portion. A flow control device as described. 6. The flow control device according to claim 5, wherein a cut is provided in the skirt portion. 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. A flow control device according to claim 1, an infusion supply circuit connected upstream of the flow control device, and a blood pressure measurement connected downstream of the flow control device. Blood pressure measuring device characterized by combining a pressure circuit and a pressure transducer provided in the blood pressure measurement circuit. 9. The flow control device according to claim 1, a transfusion supply circuit connected upstream of the flow control device, and a blood pressure measurement connected downstream of the flow control device. A blood pressure measuring device comprising a combination of 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.