JPH0244763Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a micro-continuous infusion set for infusion.
More specifically, the present invention relates to an infusion set suitable for injecting a very small amount of a medicinal solution while accurately controlling the flow rate, such as when supplying a small amount of medicinal solution to a human body over a long period of time.

[Prior art] Conventional micro-volume continuous infusion sets use an infusion pump such as a syringe pump, which is continuously used as an appropriate flow rate adjustment clamp and infusion set (Japanese Patent Laid-Open No. 47-44888). .

We also carry elastomer bags called balloons.
A device connected to an infusion set via an on-off valve is also known (Japanese Patent Application Laid-open No. 144916/1983).

Furthermore, there is a known micro-flow control clamp that consists of a core with a spiral groove whose cross-sectional area changes, a flexible sleeve provided around the outer periphery of the core, and a ring fitted around the outer periphery of the sleeve. (Special Publication No. 55-45799).

[Problems to be Solved by the Invention] However, the infusion set using the above-mentioned infusion pump has problems in that the infusion pump is heavy and bulky, making it difficult to handle and requiring high manufacturing costs.

In addition, in the case of using a balloon, it is necessary to change the piping connections between filling the balloon with the drug and draining it from the balloon, which tends to be unhygienic.

Furthermore, the clamp using the core, flexible sleeve, and ring has a problem of low control accuracy.

In view of these circumstances, it is an object of the present invention to provide an infusion set that is lightweight, easy to handle, and has low manufacturing costs.

[Means for Solving the Problems] The continuous micro-dose infusion set of the present invention is an elastic bag-like container that includes a balloon that can discharge the injected drug by applying pressure, a three-way pot, and a micro-flow rate adjustment device. An infusion set comprising a clamp and an infusion set or a catheter equipped with an infusion tube connected in this order by a tube, wherein the micro flow rate adjustment clamp has a continuous cross-sectional area along the longitudinal direction of the clamp body. a long groove for flow rate adjustment formed to vary; a covering film welded to the main body wall surface around the long groove so as to cover the open surface of the long groove;
It is characterized in that it comprises a roller that rolls while being guided by a guide portion formed along the long groove and is moved while being pressed against the upper surface of the covering film.

[Operation] In the present invention, when a medical solution is injected into a balloon, the balloon expands, and the balloon itself applies pressure in a direction to discharge the internal medical solution. When the three-way valve is opened to communicate the balloon and the micro-flow adjustment clamp, the extrusion pressure of the balloon supplies the drug solution to the micro-flow adjustment clamp, where the flow rate of the drug solution is accurately controlled before being transferred to the infusion set or catheter. It is supplied and injected into the human body.

Furthermore, the flow of the chemical solution can be accurately controlled according to the cross-sectional area of the long groove by rolling the roller of the clamp along the guide part, and it can be closed by rolling it to a position where no long groove is formed. can do.

The present invention does not use a heavy syringe pump or the like, but instead uses a light balloon that does not require a power source, making it easy to handle and reducing manufacturing costs.

Further, since the roller is rolled along the guide portion, delicate adjustments are relatively easy, and the cross section of the orifice formed between the long groove and the roller is not deformed, so the adjustment accuracy is high.

[Example] Next, embodiments of the present invention will be described.

Fig. 1 is a perspective view of an infusion set according to an embodiment of the present invention, Fig. 2 is a perspective view of the infusion set of the same embodiment before use, Fig. 3 is a longitudinal cross-sectional side view of the flow rate adjustment clamp, and Fig. 4 The figure is a plan view of the same flow rate adjustment clamp.

In FIGS. 1 and 2, 1 is a balloon, 2 is a three-way socket, 3 is a micro flow rate adjustment clamp, and 4 is an infusion set, which are connected in that order by a tube 5.

The balloon 1 serves as a supply pump that also serves as a tank for the chemical solution, and is a bag-shaped container made of an elastic material. Any type of elastic material may be used as long as it is light, has sufficient elasticity, and is resistant to chemicals, but silicone resin and the like are preferred.
When no medical solution is injected into the balloon 1, the balloon 1 contracts thinly as shown in Fig. 2, but when a prescribed amount of medical solution is injected, the balloon 1 contracts as shown in Fig. 1. Inflates like a balloon. When the balloon 1 is inflated in this manner, since the material of the balloon 1 is an elastic body, a force is exerted to cause the balloon 1 to contract back to its original state, and this force acts to push out the medical solution inside.

The three-way Kotoku 2 is a direction switching valve for switching the flow direction of the chemical solution, and has a direction switching function.
Any material can be used as long as it has chemical resistance. In this embodiment, the direction of the flow path is indicated by an arrow 2a, and the second
When the knob 2b is turned downward as shown in the figure, the drug solution can be injected into the balloon 1 from the injection port 2c, and when the knob 2b is turned sideways as shown in FIG. The opening allows the medical solution inside the balloon 1 to flow toward the flow rate adjustment clamp 3.

The flow rate adjustment clamp 3 used is one that can precisely control particularly minute flow rate adjustments. The clamp 3 will be explained next.

In FIG. 1, 31 is a clamp body, 34 is a guide portion, and 35 is a roller. The main body 31 is a long body having a substantially U-shaped cross section, and is molded from a synthetic resin material such as polyethylene, hard vinyl chloride resin, or polypropylene. This will be explained below with reference to FIGS. 3 and 4. A long groove 32, which will be described in detail later, is formed in the bottom wall 31a of the clamp body 31.
A covering film 33 is thermally welded to the upper surface of the bottom wall 31a to form a chemical flow path between the bottom wall 31a and the long groove 32. Covering film 3
3 is preferably a laminate film of polyamide and polyethylene in which the adhesive surface to the main body 31 is made of polyethylene, and when the main body 31 is made of hard vinyl chloride resin, a soft film is preferable. Vinyl chloride resin is preferred, and when the main body 31 is made of polypropylene, polypropylene is preferred. That is,
In order to be heat-sealed to the main body 31, it is necessary to select materials for the main body 31 and the covering film 33 that can be heat-sealed.

The roller 35 is attached so as to roll on the upper surface of the covering film 33 while being lightly pressed. In order to guide the rolling of the roller 35, the main body 31
Guide portions 34 are provided on both side walls. The guide portion 34 is a U-shaped groove into which the support shaft 36 of the roller 35 is fitted. The roller 35 is made of a hard synthetic resin such as polypropylene, ABS resin, polycarbonate, or hard PVC, but a belt made of a soft material such as soft vinyl chloride resin is attached to the outer peripheral surface of the roller 35. You can stay there. When a soft belt is applied, there are advantages such as the roller 35 is less likely to slip when the roller 35 is pressed with a finger, and the covering film 33 is easily pressed onto the long groove 32. However, in this case, the roller 35 must be adjusted so that the coating film 33 in the groove portion is not deformed by the pressure of the chemical liquid flowing in the groove portion, that is, the chemical liquid flow path formed by the gap between the long groove 32 and the coating film 33. It is necessary to make the pressure bonding onto the long groove 32 sufficiently strong.

Connection parts 37 and 38 for connecting the infusion tube 5 are formed at both ends of the main body 31. Each connection part 37, 38 has an infusion channel 3.
9 and 40 are bored, both of which communicate with the long groove 32. The long groove 32 is formed along the longitudinal direction of the main body 31. The cross-sectional area of the long groove 32 is formed so as to change continuously. For example, the depth of the groove is deeper on the outlet side (towards the connecting part 38) and gradually becomes shallower towards the inlet side (toward the connecting part 37). It is formed to be. Note that the cross-sectional area of the long groove 32 is not limited to the depth of the groove, but may be changed by changing the depth and width of the groove.

As described above, the chemical liquid flows into the long groove 32 from the connecting portion 37 side and flows out to the connecting portion 38 side. On the other hand, the roller 35 is movable between both ends of the main body 31, and can reciprocate between a lower end position in the figure shown by a solid line and an upper end position in the figure shown by a chain line. When the roller 35 is at the lower end position, it is not located on the long groove 32 of the roller 35, so the entire amount of the chemical liquid flows through the long groove 32 and the gap between the bottom wall 31a and the covering film 33. When the roller 35 is pushed around with a finger and stopped on the long groove 32, the coating film 33 is pinched between the roller 35 and the bottom wall 31a, so the chemical liquid passes only through the cross section of the long groove 32 where the roller stops. flowing. That is, in this case, since the long groove 32 acts as an orifice, the flow rate can be accurately controlled depending on the cross-sectional area at that time. Naturally, roller 3
When 5 moves downward, the cross-sectional area of the flow path in the long groove 32 increases, so the flow rate increases, and when it moves upward, the cross-sectional area of the flow path becomes smaller, so the flow rate decreases. roller 35
When positioned at the upper end in the figure, the covering film 33 is attached to the bottom wall 31 at the part where the long groove 32 is not formed.
Since it is pressed against point a, the flow path is completely closed and the outflow of the chemical solution is stopped.

In the clamp of this embodiment, by increasing the length of the long groove 32 and decreasing the rate of change in cross-sectional area, the flow rate can be adjusted more delicately. Furthermore, since the roller 35 has low movement resistance, it can be used in a state where it is strongly pressed onto the long groove 32. Therefore, even if a roller covered with a soft belt is used, the roller 35 can be pressed tightly onto the long groove 32. When stopped at a certain location, the cross-sectional area defined by the long grooves 32 is not expanded, so the flow rate control accuracy is extremely high.

The infusion set 4 is constructed by connecting a small infusion barrel and an intravenous needle through a tube to enable micro-infusion, and may be made of the same material as in the case of known infusion sets. However, if a catheter is used instead of the infusion set, any known catheter may be used. The connecting tube 5 is preferably made of a flexible material such as vinyl chloride resin.

Next, a method of using the infusion set of this embodiment will be explained.

First, as shown in FIG. 2, the knob 2b of the three-sided pot 2 is turned downward, and the injection port 2c and the balloon 1 are communicated with each other. In this state, a medical solution is injected into the balloon 1 using a syringe or the like.

Once the specified amount has been injected, turn the knob 2b of the three-way pot 2 sideways, as shown in Figure 1.
The balloon 1 and tube 5 are communicated with each other. In this state, the medical solution flows from inside the balloon 1 through the tube 5 and into the flow rate adjusting clamp 3 under pressure due to the contraction force of the balloon 1. Flow rate adjustment clamp 3
Then, the flow rate of the supplied drug solution is accurately controlled and sent to the infusion set 4. As described above, the ability of the flow rate adjustment clamp 3 to adjust minute flow rates is extremely high, and therefore the flow rate can be controlled with extremely high precision when a small amount of medicinal liquid is injected into a human body over a long period of time.

In the case of this embodiment, a balloon is used as a power source for extruding the chemical solution, and since it is lightweight and also serves as a tank, it is easy to handle. Furthermore, since static pressure is continuously applied until the medicinal solution is reduced to a specified amount, the medicinal solution can be pushed out over a long period of time, making it suitable as a pressure source for continuous injection.

Although one embodiment of the present invention has been described above, various modifications can be made to the present invention without changing the gist thereof.

[Effects of the device] The device of the present invention is easy to handle and has extremely high accuracy in adjusting the flow rate during continuous infusion of infusion.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an infusion set according to an embodiment of the present invention, FIG. 2 is a perspective view of the infusion set of the same embodiment before use, and FIG. 3 is a vertical sectional view of a microflow adjustment clamp. FIG. 4 is a plan view of the minute flow rate adjustment clamp. Main symbols in the drawing: 1...Balloon, 2...Three-way pot, 3...Minor flow rate adjustment clamp, 4...Infusion set.

Claims (1)

[Scope of Claim for Utility Model Registration] An elastic bag-like container that is equipped with a balloon that can discharge the injected medicinal solution by applying pressure, a three-sided pot, a microflow adjustment clamp, and an infusion set or drip tube. An infusion set comprising catheters connected in this order by tubes, wherein the minute flow rate adjustment clamp has a long groove for flow rate adjustment formed so that the cross-sectional area changes continuously along the longitudinal direction of the clamp body. A covering film is welded to the main body wall surface around the long groove so as to cover the open surface of the long groove, and the film rolls while being guided by a guide portion formed along the long groove and is crimped onto the upper surface of the covering film. A micro-continuous infusion set for infusion consisting of a roller that is moved in a fixed state.