JPH01171527A - Flow controller - Google Patents

Abstract

PURPOSE:To automatically and easily carry out priming work by constituting the title device so as to connect an incoming channel to an outgoing channel with the thrust-pressure of an elastic body when the pressure of fluid becomes the same as the prescribed pressure. CONSTITUTION:A flow control device 14 is approximately T-shaped to a first tube member 30 connected to a tube 13, and consists of a second tube member 32 connected to the first tube member 30 and an elastic body 34 installed on the edge part of the first tube member 30. When the pressure of a liquid transporting agent supplied into the incoming channel 42 and a throughout channel 44 is increased by driving a syringe pump, the liquid transporting agent in the throughout channel 44 passes through the gap between the elastic body 34 and a rod part 40, and flows from the boundary part between a rod part 38 of the first tube member 30 and the rod part 40 to the side of an outgoing channel 52.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flow control device. While forming a hole, the through hole is closed from the outlet passage side via an elastic body, and when the inlet passage side reaches a predetermined fluid pressure, the through hole opens and a predetermined amount of fluid can be supplied to the outlet passage. The present invention relates to a flow control device configured to.

[Background of the Invention] In the medical field, when performing anesthesia or intensive care management, invasive arterial pressure measurement is understood to be essential for smooth circulatory and respiratory management of patients, and the measurement system has come into widespread use.

The measurement system usually includes a syringe pump or an infusion pump that continuously supplies an infusion solution, such as physiological saline, to the system, a catheter inserted into a patient's blood pressure measurement site, and a catheter filled with blood pressure. It basically consists of a pressure quadrature transducer that detects a blood pressure value using a transfusion agent as a transmission medium, and a display/recording device that displays and records the pressure value output from the pressure quadrature transducer.

In this case, the measurement system includes a flow control device to accurately measure the pressure of the infusion agent by eliminating the influence of unnecessary external forces when detecting the pressure change of the infusion agent in the catheter using the pressure quadrangle transducer. It is provided. That is, the flow control device is disposed in a conduit that communicates the syringe pump and the catheter, and the infusion agent flows through a minute inner diameter hole of a capillary tube (resistor) provided in the flow control device. As a result, the flow rate of this infusion solution is always controlled to a predetermined value.

By the way, when using a catheter, in order to completely remove the air inside the catheter, it is necessary to perform so-called priming using an infusion agent in advance to flush the infusion agent into the catheter. For this reason, in boat fishing, the flow control device is equipped with a flush mechanism that opens a flush channel so that a large flow of water can flow temporarily.

However, in the flow control device having the flush mechanism, when performing priming, the flush mechanism must be operated while substantially driving the syringe pump to supply the infusion agent at a relatively high flow rate. The priming work is complicated.

Moreover, in this type of flow control device, in order to flow the infusion agent at a predetermined speed through a through hole with a minute inner diameter, the fluid pressure between the syringe pump and the flow control device is controlled at the time of blood pressure measurement. In reality, it is necessary to ensure a level of 300 mmHg or more. Therefore, after completing the above-mentioned priming operation, the syringe pump is driven to supply the infusion agent to the flow control device at a relatively high flow rate to maintain a predetermined pressure (300 mmH).
g or more), and then the syringe pump is operated to adjust the flow rate of the infusion solution to, for example, 1 rnl/h. As a result, it has been pointed out that there is an inconvenience in that the preparation stage before starting the blood pressure measurement operation requires a considerable amount of time and effort.

[Object of the Invention] The present invention has been made in order to overcome the above-mentioned disadvantages, and the present invention has been made in order to overcome the above-mentioned disadvantages. and an elastic body is provided on the outlet passage side that is pressed with a predetermined pressing force to close the communication passage, and when the fluid pressure on the inlet passage side becomes greater than the fluid pressure on the outlet passage side by a predetermined pressure In addition, the elastic body is pressed so that the inlet passage and the outlet passage are communicated with each other, so that the priming operation can be performed automatically and easily, and does not require a large fluid pressure on the inlet passage side. without,
It is an object of the present invention to provide a flow control device that can shorten preparatory work at once and enable accurate blood pressure measurement.

[Means for Achieving the Object] In order to achieve the above object, the present invention provides a flow control device that is incorporated into a blood pressure measurement system and controls the amount of a fluid such as an infusion. having an inlet passage and an outlet passage, and communicating the inlet passage and the outlet passage through a communication passage having a narrower cross-sectional area than the respective passages;
An elastic body is arranged at the end of the communication passage on the outlet passage side, and the elastic body closes the end of the outlet passage, and when the fluid introduced from the inlet passage reaches a predetermined pressure, the elastic body closes the end of the communication passage on the outlet passage side. is pressed so that the end on the outlet passage side opens and fluid flows from the inlet passage to the outlet passage.

[Embodiments] Next, preferred embodiments of the flow control device according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a blood pressure measurement system incorporating the flow control device. The blood pressure measurement system 10 includes a syringe pump 12 for continuously supplying an infusion agent such as physiological saline, and the upstream side of a flow control device 14 is connected to the syringe pump 12 via a tube 13. The downstream side of the flow control device 14 is branched, as will be described later, and a tube 16 is connected to one side of the downstream side.
A three-way stopcock 18 is connected to the three-way stopcock 18, and a catheter 24 inserted through a tube 20 into a blood vessel of a patient 22 is connected to the three-way stopcock 18. In addition, the flow control device 14
A pressure-quadrant transducer 26 is connected to the other downstream side of the pressure-quadrant transducer 26, and a display/recording device 28 is connected to this pressure-quadrant transducer 26 via a tube 27.

Then, as shown in FIGS. 2 and 3, the flow control device 14 connects the first tube member 3 connected to the tube 13.
0, a second tube member 32 having a substantially T-shape and connected to the first tube member 30, and an elastic body 34 attached to the end of the first tube member 30. Ru.

The first tube member 30 is made of a hard thermoplastic resin material, for example, polycarbonate, and has a large diameter portion 36 that slopes radially outward on its outer periphery, and a stepped portion on the large diameter portion 36. A first rod portion 38 is provided via the first rod portion 38 . A second rod portion 40 having a smaller diameter is integrally formed at the end of the tenth rod portion 38.
The tip of the zero point portion 40 has a conical shape. An inlet passage 42 is bored in the center of the first pipe member 30 and extends halfway to the twentieth joint 40, and a communication passage 44 having a narrow opening cross-sectional area is connected to the end of the inlet passage 42. It goes through. The communication passage 44 is inclined in a radially outward direction of the twentieth end portion 40 and opens to the outside from the outer circumferential end of the twentieth end portion 40 .

In this case, the communication passage 44 has a diameter of substantially 0.3 m.
m, a through hole with a length of about 2 mm.

Further, the elastic body 34 is attached to the twentieth joint portion 40.

The elastic body 34 has a cylindrical shape with one end closed,
It has an inner diameter smaller than the outer diameter of the twentieth joint portion 40. That is, the outer diameter of the 20th tube portion 40 is 4.511 mm.
IIIl, and on the other hand, the inner diameter of the elastic body 34 is 3.8+n
m, and its wall thickness is 0.4 mm. Therefore, the elastic body 34
is fitted onto the twentieth joint portion 40 under a predetermined tension.

On the other hand, like the first tube member 30, the second tube member 32 is made of, for example, polycarbonate and includes a main body portion 46 into which the tenth tube portion 38 is fitted. A small diameter part 48 which slopes and decreases in diameter in the same way as the tip of the 20th tube part 40 is integrally formed at the end of this main body part 46, and at the end of this small diameter part 48, both sides in the horizontal direction are formed. A first tubular body 50a and a second tubular body 5Qb are provided which extend. Therefore, the main body 46
and the first and twentieth tube portions 38.40 of the first tube member 30.
and the elastic body 34 define an outlet passage 52, which extends into the small diameter portion 48 and connects the first passage 54a of the first tube 50a and the second passage 54a of the second tube 50b. 54b
It communicates with.

The flow control device according to this embodiment is basically constructed as described above, and its operation and effects will be explained next.

Therefore, in the blood pressure measurement system 10 shown in FIG.
The tube 13 is connected to the end of the first tube member 30 constituting the flow control device 14, and the first tube body 5 of the second tube member 32 is
While connecting the tube 16 to 0a, the second tube body 50b
A pressure transducer 26 is connected to. After completing the circuit connection work of the blood pressure measurement system 100, so-called priming is performed prior to actually measuring blood pressure.

That is, first, when the operator drives the syringe pump 12, the infusion agent supplied by the syringe pump 12 reaches the inlet passage 42 and the communication passage 44 of the first tube member 300 via the tube 13. Here, the communication passage 44 is closed with a predetermined pressing force by the elastic body 34 attached to the 20th tube part 40, and the syringe pump 12 is driven to further infuse the infusion into the inlet passage 42 and the communication passage 44. By supplying the infusion agent and increasing the pressure of the infusion agent, an extremely small gap 56 is defined between the elastic body 34 and the twentieth tube portion 40 (see FIG. 4). Therefore, the infusion agent in the communication passage 44 flows through the gap 56 from the boundary between the tenth neck part 38 and the twentieth neck part 40 of the first tube member 30 to the outlet passage 52 side. Therefore, each tube 13, 16 constituting the blood pressure measurement system 10
．． 20 etc. are filled with an infusion solution, and a portion of the infusion solution is led out from the catheter 24 along with air.

At that time, the elastic body 34 attached to the 20th tube portion 40
The open end portion extends to the vicinity of the boundary between the 20th wood portion 40 and the first wood portion 38. by this,
The infusion agent flowing through the gap 56 defined between the elastic body 34 and the 20th tube 40 is
When reaching the outlet passage 52 through the boundary area with the tube portion 38, the air remaining in the boundary area can be effectively sent out to the outside. As a result, it is possible to prevent the inconvenience of air remaining in the flow control device 14.

Next, the catheter 24 is inserted into a predetermined part of the artery or vein of the patient 22 to measure the desired blood pressure. That is, as described above, the infusion agent supplied from the syringe pump 12 is passed from the tube 13 to the inlet passage 4 of the first tube member 30.
2 and reaches the communication passage 44. Then, the infusion agent presses the elastic body 34 and passes through the outlet passage 52 through the gap 56 defined between the elastic body 34 and the twentieth tube portion 40.
Flows through. This allows the infusion solution to reach a predetermined flow rate (0,
5~3rrtl! /h) and the first passage 54a
The liquid is injected into the blood vessel of the patient 22 from the catheter 24 through the tube 16, the three-way stopcock 18, and the tube 20.

During this process, the blood pressure of the patient 22 is detected by the pressure quadrature transducer 26 using the infusion agent in the catheter 24, tube 20, tube 16, second passageway 54b, etc. as a transmission medium; A proportional voltage is output to the display/recording device 28. As a result, the blood pressure value is displayed on the display/recording device 28 in real time.

In this case, in this embodiment, the inner diameter of the communication passage 44 communicating with the inlet passage 42 is selected to be substantially 0.3 mun, and the elastic body 34 is attached to the 20th end part 40 in a predetermined tension state. There is. For this reason, the flow control device 14
The flow rate was reduced to 3.0rrti! /h, the fluid pressure on the inlet passage 42 side of the flow control device 14 may be 30 mmHg or less. Therefore, as in the prior art, the fluid pressure on the upstream side of the flow control device is, for example, 30
Compared to the case where the setting is set to 0 mmHg, the preparation time after the priming work can be shortened at once, and it becomes possible to carry out efficient blood pressure measurement work. Moreover, in the priming work, the operator does not need to substantially operate the flow control device 14, and as a result, the priming work can be further simplified and the burden on the operator can be reduced.

In addition, a minute gap 56 defined between the elastic body 34 and the 20th tube portion 40 functions as a resistor, and affects, for example, pressure fluctuations caused by driving the syringe pump 12. Become something without being done. As a result, there is an advantage that pressure measurement work can be performed with high precision.

Furthermore, in the flow control device 14, the outlet passage 52
The 20th tube 40 that enters the opening is covered with an elastic body 34, so that the infusion solution does not flow back from the outlet passage 52 to the communication passage 44. Therefore, when measuring blood pressure, for example, even if the tube 13 is detached from the syringe pump 12, the patient
It becomes possible to prevent blood, etc. from flowing into the flow control device 14 side.

Next, another embodiment of the flow control device according to the present invention is shown in FIG. Note that the same reference numerals are given to the same components as those of the flow control device according to the first embodiment, and detailed explanation thereof will be omitted.

In this case, in the flow control device 60 according to the second embodiment, the first tube member 30 is not provided with a portion corresponding to the 20th tube portion 4o described above, but is provided coaxially with the inlet passage 42. A communication passage 44 communicates with the outside from the end of the tenth prong 38. A bulge 61 is formed on the end surface of the tenth joint 38 and is inclined outward in the radial direction. On the other hand, the second tube member 32 has the tenth joint portion 3 of the first tube member 30.
A stepped hole 62 is provided in which the stepped hole 62 is fitted, and a notch 64 that slopes corresponding to the bulge 61 is formed on the inner wall surface defining the stepped hole 62. An elastic body 66 having a substantially disk shape is clamped and engaged. Therefore, the first tube member 3
0 to the stepped hole 62 of the second pipe member 32.
When fitted, since the elastic body 66 is inclined toward the tenth prong 38, it slides into contact with the end face of the tenth prong 38 with a predetermined pressing force, thereby closing the communication passage 44.

In such a configuration, the flow control device 60 is
It will be easily understood that when attached to the blood pressure measurement system 10 shown in the figure, the same functions and effects as those of the flow control device 14 described above can be obtained.

[Effects of the Invention] As described above, according to the present invention, the inlet passage and the outlet passage for flowing fluid such as medicine are communicated through the communication passage having a narrow opening cross-sectional area, and the An elastic body is provided on the outlet passage side to close the communication passage with a predetermined pressing force.

Therefore, when the fluid pressure supplied from the inlet passage reaches a predetermined pressure, the elastic body is pressed by the fluid and the inlet passage and the outlet passage communicate with each other.

As a result, the effect that the priming work can be performed automatically and easily can be obtained. Moreover, by selecting the opening cross-sectional area of the communicating passage and the elastic force of the elastic body, the communicating passage can be opened and connected to the inlet passage even if the differential pressure between the fluid pressures of the outlet passage and the inlet passage is relatively low. It becomes possible to communicate with the exit passage. Therefore, for example,
The advantage is that the preparation work after the priming work can be done all at once in a short time, and that it is possible to achieve efficient blood pressure measurement work in the blood pressure measurement system.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments.
Of course, various improvements and changes in design are possible without departing from the gist of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of a blood pressure measurement system incorporating a flow control device according to the present invention, FIG. 2 is an exploded perspective view of the flow control device according to the present invention, and FIG. 3 is a longitudinal sectional view of the flow control device. FIG. 4 is an enlarged explanatory view of essential parts of the flow control device shown in FIG. 3, and FIG. 5 is a longitudinal sectional view of a flow control device according to another embodiment of the present invention. 10... Blood pressure measurement system 12... Syringe pump 14... Flow control device 24... Catheter 26... Pressure transducer 30. 32... Tube member 34... Elastic body 3
8.40...Rod part 42...Inlet passage 4
4...Communication passage 52...Exit passage Patent applicant Terumo Corporation

Claims (4)

[Claims] (1) A flow control device that is incorporated into a blood pressure measurement system and controls the amount of a fluid such as an infusion, and has a fluid inlet passage and an outlet passage, and has a fluid inlet passage and an outlet passage. communicating via a communication passage having a narrower cross-sectional area than the respective passages, disposing an elastic body at an end of the communication passage on the outlet passage side, and closing the outlet passage side end with the elastic body; When the fluid introduced from the inlet passage reaches a predetermined pressure, the elastic body is pressed and the outlet passage side end opens, allowing the fluid to flow from the inlet passage to the outlet passage. Characteristic flow control device. (2) The device according to claim 1, which comprises a first tube member defining an inlet passage and a second tube member defining an outlet passage, and wherein the first tube member has an outlet. A bulge protruding into the passage is formed, and a communication passage is provided in the bulge to communicate the inlet passage and the outlet passage, and a cylindrical elastic body with one end closed is placed under a predetermined tension in the bulge. 1. A flow control device configured to be externally packaged in an installed state, and configured such that the other open end of the elastic body extends to the base of the bulge. (3) In the device according to claim 2, the communication passage provided in the bulge has one end communicating with the inlet passage, and the other end opening at the outer periphery of the bulge. Flow control device. (4) The device according to claim 1, comprising a first pipe member defining an inlet passage and a communication passage communicating therewith, and a second pipe member defining an outlet passage. , a plate-shaped elastic body is attached to a peripheral wall portion of the second tube member that defines an outlet passageway so as to be inclined toward the inlet passageway, and the first tube member and the second tube member are connected to each other. A flow control device configured such that an elastic body presses an end surface of the first tube member with a predetermined pressing force to close one end of the communication passage.