JPH0321250Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flow control device for controlling the flow of liquid when supplying the liquid to a catheter.

[Conventional technology and its problems]

For example, in blood pressure measurement using a catheter, a method is used in which the catheter is filled with sterile physiological saline or the like, and this solution is further injected into the subject at a very slow rate. In this way, blood does not flow into the catheter, thereby preventing blood from coagulating within the catheter, and making it possible to perform accurate measurements. However, when measuring blood pressure using this method, it is necessary to flow the above solution very slowly, so a flow resistor with a large resistance value must be installed along the path from the solution supply source to the catheter. . A marine bore type capillary tube is generally used as this flow resistor. By the way, when measuring blood pressure while flowing a solution like this,
Care must be taken to prevent air from entering the blood vessels. For this reason, the solution path must be completely free of air bubbles before inserting the catheter into the subject's blood vessel. However, as mentioned above, since there is a flow resistor with a large resistance value in the middle of this passage, the work requires a long time. Furthermore, even when blood pressure is measured while the solution is flowing into the subject's blood vessel, the flow rate is very slow, so if the catheter is left in the blood vessel for a long time, the end of the catheter may leak. A situation occurs where the blood clots. In view of this situation, devices have conventionally been used in which the solution passes through a flow resistor during normal blood pressure measurement, and the solution flows through another large passageway when necessary. According to such a device, the work of removing air bubbles as described above can be carried out in a short time, and
When measuring blood pressure over a long period of time, it is possible to easily remove coagulated blood from the end of the catheter while the catheter is inserted into the blood vessel of the subject. Conventional devices of this type have, for example, a mechanism in which two passages are provided in the main body of the apparatus, a flow resistor is provided in the middle of one passage, and the other passage is normally closed and opened when necessary. There are some with However, since this device has a complicated structure, it is difficult to completely remove air bubbles, and the operation is complicated.

The present invention has been made to overcome these drawbacks, and its purpose is to provide a flow control device that is simple in structure and easy to operate.

[Means for solving problems]

In the present invention, a flow resistor is press-fitted into a predetermined position of a tube that has more elasticity than the flow resistor, and is held in this position, and a longitudinal length is attached to the outer surface of the tube in the part where the flow resistor is press-fitted. The above objective is achieved by creating a flow control device by providing two parallel protrusions in the direction.

[Effect]

In this flow control device, under normal conditions, both ends of the tube are communicated via a flow resistor. When two protrusions are brought into close proximity by an external force, the portion of the tube between the protrusions ridges, thereby creating a gap between the flow resistor and the tube. Since this gap communicates both ends of the flow resistor, a large amount of solution flows at this time.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of the flow control device. 1 in the diagram
is a housing consisting of a body 2, an outlet fitting 3 and an inlet fitting 4, which are glued together. The main body 2 is provided with a passage 5 and a passage 6, which communicate on the outlet side. The outlet fitting 3 is provided with a passage 7;
This passage 7 is an extension of the passage 5. The inlet fitting 4 is provided with a passageway 8 . One end of the inlet fitting 4 is a tubular projection 9, and the inside of the tip of the projection 9 is one end of the passage 8. The diameter of the passage 8 increases from the middle to the outlet, and the filter 10 and the support tube 11 that supports it are fitted into this part. Furthermore, support tube 1
1 has a conduit 12 fitted inside it. The main body 2 has a tubular protrusion 13 at a position opposite to the protrusion 9.
is provided, and the inside of the tip of this projection 13 serves as one end of the passage 6. Parts of the tip portions of the protrusion 9 and the protrusion 13, which are opposed to each other, are cut out. These portions are referred to as a notch portion 14 and a notch portion 15, respectively. 16
is a tube. The tube 16 is made of a highly elastic material, such as polyurethane rubber. tube 1
A marine bore type flow resistor 17 is press-fitted into the inside of the casing 6. 17A is a capillary tube of flow resistor 17. This flow resistor 17 is pressed by protrusions 13 and 9 fitted from both sides of the tube 16 through rings 18 and 19 formed of an elastic material and provided on both sides thereof. . 20A indicates one of the two protrusions provided on the outer surface of the tube 16 in parallel with each other in the longitudinal direction. The appearance of the tube 16 is shown in FIG.
As shown in this figure, two protrusions 20A, 20
B is formed integrally with the main body of the tube 16. Third
The figure is a cross-sectional view of the protrusion 2 shown in FIG.
This shows a state in which no external force is applied to 0A and 20B. Further, at this time, as shown in FIG. 4, the passage 8 (which is the same as that shown in FIG. 1) and the passage 6 are connected only through the flow resistor 17.

Next, the operation of this device when used for blood pressure measurement will be explained. Conduit 12 is connected to a heparinized saline source, passageway 7 is connected via a conduit to the catheter, and passageway 5 is connected to a pressure transducer.

First, before inserting the catheter into the subject's blood vessel, the examiner must check all passages 5, 6, 7,
It is necessary to completely remove air from 8. In this case, only the solution supply source is connected to this device via the conduit 12, and the examiner connects the two protrusions 20
Hold A and 20B between your fingers and apply force to bring them closer together. At this time, the protrusions 20A, 20B
A force is applied in the direction of the arrow as shown in FIG.
The portion swells in a ridge shape, and the inside thereof is separated from the flow resistor 17 to form a space 21. For this reason,
As shown in FIG. 6, two notches 14 and 15 are provided.
are in communication, the passage 8 and the passage 6 are in communication, and the solution that has reached the passage 8 from the solution supply source reaches the passage 6 using the space 21 as a passage. The flow of this solution is indicated by arrows in FIG. The solution flowing into passage 6 further reaches passages 7 and 5. In this way, the passages 8, 6,
7,5 are all filled with solution and the air is removed. Next, when the examiner releases the protrusions 20A and 20B from his fingers, the tube 16 returns to its original state as shown in FIGS. 3 and 4. The examiner then connects a pressure transducer to passage 5 and a catheter to passage 7 via a conduit. Note that at this time, the conduit connecting the passage 7 and the catheter and the catheter are filled with a solution in advance. After filling the passageway from the solution source to the end of the catheter with solution and removing air, the examiner inserts the catheter into the subject's blood vessel and measures the blood pressure value obtained from the pressure transducer. During this measurement, the solution flows through the flow resistor 17. Blood clots at the end of the catheter when measurements are taken over a long period of time. In this case, the inspector should check the protrusion 20A, as well as the air removal work.
Hold 20B between your fingers and apply force to bring them close together. This creates a space 21 between the flow resistor 17 and the tube 16, through which the solution flows from the channel 8 into the channel 6. Next, when the examiner releases the protrusions 20A and 20B from his fingers, the tube 16 returns to its original state as shown in FIGS. 3 and 4.
By repeating this operation, the coagulated blood at the end of the catheter is removed, allowing accurate blood measurements over a long period of time.

According to this embodiment, the groove formed between the tip ends of the two tubular protrusions 9 and 13 provided on the housing 1 and the flow resistor 17 is replaced by a ring made of an elastic material. 19 and 18, there is very little room for air bubbles to accumulate. However, the mutually opposing portions of the tips of the protrusions 9 and 13 are notched, and these notches 14 and 15 are cut out from the ring 1.
Not blocked by 9 and 18. However, since the notches 14 and 15 correspond to the inlet and outlet, respectively, of the passage through which the solution flows during air removal work, no air bubbles remain there. Note that the pipe 16 can seal the grooves formed between the tips of the protrusions 9 and 13 and the flow resistor 17 in this way.
This can only be achieved by creating a structure in which the space 21 is formed by bringing the protrusions 20A and 20B close together in this way. For example, by supporting one point along the longitudinal direction of the outer circumferential surface of the tube 16 and pressing a point on the outer circumferential surface opposite to this point, the flow resistor 17 and the inner wall surface of the tube 16 can be connected. A gap can be created between them. However, with such a structure, when the tube 16 is pressed, it bends, the centers of the flow resistor 17 and the tubular protrusions 9, 13 shift, and the rings 19, 18 tend to come off.
It is not possible to completely seal between the flow resistor 17 and each of the protrusions 9, 13. However, according to the structure of this embodiment, even if a gap is created between the tube 16 and the flow resistor 17, the centers of the flow resistor 17 and the tubular protrusions 9 and 13 will not shift, so the ring 1
9 and 18 do not come off, and the spaces between the tips of the protrusions 9 and 13 and the flow resistor 17 are completely sealed.

Note that the protrusions 20A and 20B of the main body of the tube 16
If the portion between the two is made thinner than the other portion, the space 21 can be easily formed in this portion when force is applied to the protrusions 20A, 20B.

[Effect of idea]

As described above, according to the present invention, it is possible to realize a flow control device that has a simple structure, is easy to operate, and can completely remove air bubbles in a passage.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the entire flow control device of the present invention.
FIG. 2 is a perspective view of the tube shown in FIG. 1, and FIGS. 3 to 6 are explanatory views of the operation of the flow control device of the present invention. 1...Housing, 9, 13...Protrusion, 16...
...Tube, 20A, 20B... Protrusion, 17... Flow resistor, 18, 19... Ring.

Claims (1)

[Claims for Utility Model Registration] (1) A flow control device for controlling the flow of liquid between a catheter and a liquid supply source that supplies liquid to the catheter, including a flow resistor and A tube made of a highly elastic material, into which the flow resistor is press-fitted into a predetermined position, and on the outer surface of the part into which the flow resistor is press-fitted, two protrusions are provided in parallel in the longitudinal direction. , a holding means for holding the flow resistor at the predetermined position within the tube. (2) The holding means includes a housing having two passages having an inlet and an outlet, one end of each of which is a tubular protrusion facing each other, and each of these protrusions is press-fitted into each end of the tube. Department and
a sealing part having elasticity and press-fitted into the groove part formed between each of the tips of the protrusions and the flow resistor to seal the parts of each of these groove parts except for the mutually opposing parts; Two protrusions provided on the tube communicate mutually opposing portions of each of the grooves through a gap created between the flow resistor and the inner wall surface of the tube when the two protrusions are brought close to each other by an external force. The flow control device according to claim 1, characterized in that the flow control device is provided at a position where (3) The flow control device according to claim 2, wherein at least one of the seal portions is a ring-shaped member.