JPH0496761A - Balloon body for injecting chemical and instrument for injecting chemical using it - Google Patents

Abstract

PURPOSE:To inject a chemical into a balloon without using a needle and also prevent the chemical injected into the balloon from flowing back by forming the open side end portion of a chemical passage as fitting type or threaded engagement type, and providing within the chemical passage a check valve which can be opened by a communicating pipe extending from the open side end portion. CONSTITUTION:A chemical is injected by inserting a syringe in a chemical passage 3, and pressing the syringe against the lure-taper-shaped inner peripheral face of a lock adapter 19. The needle end of the syringe 22 is then located at the inlet side of a check valve 14. The wider the nozzle of the syringe, the smaller the filling pressure of the syringe as compared to when using conventional syringes and injection is facilitated accordingly and also injecting operation can be finished in a short time. As the chemical is injected, a balloon 3 is expanded in its axial direction as well as in its radial direction. In this case, inner air remaining in the balloon 3 is forced out through a hydraulic- pressure resistant filter 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drug solution injection device used for continuously injecting a predetermined amount of drug solution into a blood vessel, epidural, subcutaneous, bladder, etc. little by little. For more details, see how to ensure the inside of the balloon,
The present invention relates to a drug solution injection tool that allows easy injection and draining of drug solutions.

[Prior Art] Traditionally, as a means of injecting small amounts of medicinal solutions such as antibiotics and anticancer drugs into blood vessels, bladders, etc., the medicinal solution is injected into a balloon made of an elastic material and the contraction force of the balloon is used. BACKGROUND ART A drug solution injection device is used to continuously inject a drug solution into a blood vessel or the like over a relatively long period of time.

An example of a conventional liquid drug injection tool is shown in FIGS. 9 and 10. This is the liquid drug injection tool proposed earlier by the applicant (
(filed on July 5, 1990), Fig. 9 is an overall explanatory diagram showing a state in which the drug solution injection needle is not actually used as a drug solution injection stopper, and Fig. 10 is the same as shown in Fig. 9. FIG. 2 is an enlarged cross-sectional view of the balloon portion of the drug solution injection tool when filled with a drug solution.

The drug solution injection tool shown in FIGS. 9 and 10 includes a balloon member), a housing (1) that accommodates the balloon member), and a drug solution outlet portion (j+) having a flow rate control unit for adjusting the flow rate of the drug solution. It consists of

Specifically, as shown in FIG. 10, the balloon member) includes a rod-shaped inner shaft (50), a cylindrical outer shaft (51) slidably mounted on the inner shaft (50), and Inner shaft (5
an inner bearing (52) integrally formed with the inner shaft at one end of the inner shaft (52) opposite to the side where the outer shaft (51) is sheathed; ) is provided on the outside of both of these shafts so as to cover the inner shaft (50), and one end thereof
The balloon (53) is made of an elastic material and the other end is tightly fixed to the outer shaft (51). Also,
A drug solution inlet/outlet part (54) is formed at one end of the housing +i), and a drug solution injection stopper (55) is inserted in the drug solution inlet/outlet part (54) in an airtight and liquid-tight manner.

In such a drug solution injection tool, a drug solution is injected by inserting a needle of a syringe or the like into the drug solution injection stopper (55). In addition, the drug solution injection needle (56) of the drug solution outlet (j)
) is similarly inserted into the drug solution injection stopper (55) to cause the drug solution to flow out.

According to this drug injection device, the clearance between the inner and outer shafts can be reduced, and as a result, the amount of liquid remaining inside the balloon can be significantly reduced compared to previous drug injection devices. .

[Problems to be Solved by the Invention] However, in the conventional liquid drug injection device described above, the needle is actually a stopper made of a rubber-like elastic body, and the liquid drug is injected and outflowed through this needle. . Since the medicinal solution is injected through a narrow passage called a needle, the filling pressure is high, making filling difficult and requiring time to operate. In addition, it is not easy to insert the needle straight into the stopper, and for this reason, there is a problem in that the drug solution leaks from the gap between the needle and the stopper when injecting the drug into the human body over a long period of time.

SUMMARY OF THE INVENTION In view of the above-mentioned situation, the present invention aims to provide a liquid drug injection tool that has improved the drawbacks of the prior art. That is, an object of the present invention is to provide a drug solution injection tool that can easily and reliably inject and drain a drug solution into a balloon without using a needle.

[Means for Solving the Problems] The drug solution injection device of the present invention includes a drug solution injection balloon body and a drug solution outflow assembly, and the drug solution injection balloon body has a cylindrical outer shaft and an inner shaft of the outer shaft. an inner shaft built into the
provided outside of both shafts so as to cover both shafts,
Consisting of a balloon made of an elastic material, one end of which is tightly fixed to an outer shaft and the other end tightly fixed to an inner shaft, and a common drug liquid passage for injecting and outflowing a drug solution, which communicates with the inside of the balloon, A fitting type or threaded type connector is formed at the open end of the chemical liquid passage, and a fitting or screw type connector is formed in the chemical liquid passage to prevent the medical liquid in the balloon from flowing out when the medical liquid is injected into the balloon. A check valve is provided that can be opened by a flow pipe inserted from the open end of the medical liquid passage when the medical liquid flows out, and the medical liquid outflow assembly has one end that is connected to the inside of the body. A connecting device is provided for injecting the chemical solution, and the other end is provided with a connecting device that can be fitted or threaded and has a communicating pipe long enough to communicate with the inside of the balloon, and for controlling the amount of the chemical solution. It is characterized by having a flow rate control section.

[Function] In the drug solution injection tool of the present invention, the open side end of the common drug solution channel for injecting the drug solution into the balloon and flowing out the drug solution from the balloon is formed in a fitting or screw shape. Further, a check valve that can be opened by a communicating pipe from the open end is provided in the chemical liquid passage. Therefore, without using an injection needle, a syringe filled with a drug solution can be directly fitted or screwed into the fitting or threaded connector to inject the drug solution. In this case, since a check valve is provided inside the medicinal liquid passage, the medicinal liquid once injected into the balloon will not flow back.

Further, the chemical solution outflow assembly according to the present invention is provided with a fitting or screw-like connector having a communicating pipe having a length that communicates with the inside of the balloon and can open the check valve. Then, when this connector is connected to the fitting or screw-like connector of the balloon body for chemical liquid injection, the communication pipe pushes the check valve wider in the medical liquid filling direction, canceling the effect of the check valve. . In this way, the medicinal solution can flow out without using a conventional injection needle.

[Example] Hereinafter, a drug solution injection balloon body of the present invention and a drug solution injection tool using the same will be explained based on the accompanying drawings.

FIG. 1 is an explanatory view of one embodiment of the drug solution injection tool of the present invention, showing a state in which the drug solution injection balloon body is not connected to the drug solution delivery assembly, and FIG. 2 is a diagram showing the state shown in FIG. 1. An enlarged cross-sectional view showing the medical solution injection balloon body of the chemical liquid injection device when filled with a medical solution. FIG. 3 shows a part of the connector of the chemical solution outflow assembly shown in FIG. 1 and the luer taper of the chemical solution injection balloon body. An enlarged cross-sectional view of the shaped adapter,
FIG. 4 is a diagram showing a state in which a part of the connector shown in FIG. 3 is inserted into the Luer tapered adapter also shown in FIG. 3, and FIG. 5 is an explanatory diagram of another embodiment of the drug injection device of the present invention. Figure 6 shows the balloon body for chemical liquid injection of the chemical liquid injection tool shown in Fig. 5 when it is filled with chemical liquid. FIG. 7 is an explanatory diagram for injecting the drug solution in the syringe into the balloon, and shows the state where the syringe and the balloon body for drug solution injection are not connected. FIG. It is a figure when filling a chemical|medical solution into.

First, the overall structure of the liquid drug injection tool of the present invention will be explained. m
1 is a drug solution injection device according to an embodiment of the present invention, which is composed of a drug solution injection balloon body (, 1) and a drug solution outflow assembly (b). Each part will be explained in detail below. do.

The drug solution injection balloon body (a) is a part filled with a drug solution and a driving part that moves the drug solution to the injection site of the human body. It consists of a cylindrical outer shaft (2), a balloon (3) provided on the outside of both shafts, and an inner bearing (4) formed integrally with the inner sleeve (1). An umbrella-shaped member (5) is fixed to one end of the outer ring ('2J) opposite to the side covered by the inner shaft (1).

The balloon (3) has a cylindrical shape and is provided outside the inner shaft (1) and the outer shaft ('2J) so as to cover both of these shafts. The end of the balloon (3) is airtightly fixed to the outer ring (2) by a sealing means (6) such as an O-ring. The balloon (3) can be of any thickness and is not particularly limited in the present invention.By filling the balloon (3) with a chemical solution, the balloon (3) can be formed in both the radial direction and the elongated direction (the axial direction of the inner shaft (1) or outer ring (2)). It has a structure that can expand even further.

The outer shaft (2) moves along the inner shaft (1) as the balloon (3) moves.
) is used as a guide to move in the axial direction, and since the relationship between the position and the amount of chemical solution remaining in the balloon (3) is constant, by providing a scale on the inner ring (1) or housing (7), the amount of drug solution can be adjusted. You can also check the amount of outflow.

A water pressure filter (8) is provided at one end of the outer shaft (2) opposite to the side covered by the inner shaft (1).This water pressure filter (8) is This is a member that plays the role of expelling air remaining in the balloon (3) to the outside during injection of a chemical solution, and can be made of polyester, fluororesin, or a laminate of these.

An inner bearing (4) is formed integrally with the inner shaft (1) at one end of the inner shaft (1) opposite to the side where the outer shaft is sheathed. The inner bearing (4) is a short cylindrical member, and a chemical solution inlet is formed at its end on the inner ring (1) side. The chemical solution inlet is connected through the inside of the inner bearing (4).
It communicates with a chemical liquid passage of a housing (7) which will be described later.

The housing (sword) prevents the balloon (3) from being damaged by contact with sharp objects on the outside, and also prevents chemical liquid from leaking to the outside in the event that the balloon leaks due to a defect such as a pinhole in the balloon itself. This is a part that functions to seal the chemical solution to prevent it from scattering.Air vent openings (G)) are formed at appropriate locations in the housing (7), and air passes through the openings (Kl)). It is preferable to provide a hydrophobic filter (formerly known as a hydrophobic filter) that allows the chemical solution to pass through.

One end surface of the housing (7) is closed by a cap G2), and the center part of the cap a2) is used for injecting a medical solution into the balloon (3) or injecting a medical solution from the balloon (3) into a predetermined location. A chemical liquid passage opening is formed to serve as a flow path for the chemical liquid during the process.

As shown in FIGS. 2 to 4, in the chemical liquid passageway, a duckbill type check valve 04), a fixed disk b, and a sealing means O2 are provided in this order from the balloon (3) side. The duckbill type check valve 04) has a closed end shaped like a platypus' beak, allowing the chemical solution to flow into the balloon (3) but preventing it from flowing in the opposite direction. The structure is such that check valve f1
As for 4), in addition to the duckbill type valve, full valves, flap valves, poppet valves, ball valves, etc. can be used, and materials for these valves include fluororesin, nylon, polyolefin, polyvinyl chloride, Examples include polycarbonate and silicone resin. The fixed disk b supports the substrate of the check valve (14), and has an opening 07 in the center for the inflow and outflow of the chemical solution.

In an annular recess Q8) formed by a lock adapter, which will be described later, and a fixing disk b, an 0 ring serving as a sealing means 0 is disposed. The inner diameter of the 200 ring is the same as or smaller than the outer diameter of the communication pipe, which will be described later, so that the sealing performance when the communication pipe is inserted into the chemical liquid passage a3 is improved.

09 is a lock adapter which is a substantially cylindrical connector having a Luer tapered inner surface.

This lock adapter (to) is fitted into a recess (2) formed in the cap (02). A threaded portion (211) is formed on the outer periphery of the end on the lock adapter side for connecting a chemical liquid outflow assembly to be described later.A fitting type connection means may be provided in addition to the threaded portion (2).

Next, the drug solution outflow assembly <b+ used for sending the drug solution filled in the balloon to a device such as a PSv set or a balloon catheter will be explained.

The chemical liquid outflow assembly (b) is connected to the lock adapter 0.
9, a flow rate control section (31) for controlling the amount of liquid medicine, a liquid medicine injection tube (32), and a connector (33).

When the connector part ■ is connected to the lock adapter side, push open the check valve 04) and insert the balloon (3).
A communication pipe (34) having a length that can communicate with the inside is provided. This communication pipe (34) can be made of synthetic resin such as polycarbonate, polyvinyl chloride, polyolefin, or metal such as stainless steel. In this embodiment, this communication pipe (34) is fixed to the inner peripheral surface of the connector part (2). As mentioned above, the protrusion length (fI) of the communication pipe (34) is the duckbill type check valve 04) when the connector part (1) and the lock adapter are connected, as shown in Figure 4. The length is set so that it can be pushed out. As a result, check valve 04
) is forcibly released, and the drug solution filled in the balloon (3) can flow out without using an injection needle.

(35) is the threaded part (35) on one side of the connector, which is the threaded part C21+ formed in the lock adapter theory mentioned above.
The chemical liquid injecting balloon body (field) and the chemical liquid outflow assembly (b) are connected by screwing with the chemical liquid injection balloon body (b).This connection may be made by fitting other than screwing.

The flow rate control unit (31) is a part that controls the flow rate of the chemical solution, and is a pipe with a closed end on the downstream side, which the applicant previously proposed in JP-A-1-135356 and JP-A-2-11160. It is possible to use a pipe having at least one micropore, (2) a perforated pipe such as a porous glass pipe, (2) a stainless steel pipe with a small inner diameter, and the like.

Between the a quantity control part (31) and the connector part ■, and on the human body side of the flow rate control part (31), soft polyvinyl chloride is used.
A chemical liquid injection tube (32) made of soft synthetic resin such as polypropylene or polyester is connected. Providing a mini-clamp (not shown) in the middle of the tube (32) has the advantage that injection of the drug solution can be easily stopped and restarted.

There is a luer taper at the tip of the drug solution injection tube (32).
A connecting tool (33) is provided, and the connecting tool (33) is
33) to which an intravenous needle, PSv set, etc. are connected. The connecting device (33) may be equipped with a check valve (not shown) to prevent the medical solution from flowing backward due to venous pressure, etc. Figures 5 and 6 show the medical solution injection system of the present invention. Other embodiments of the implement are shown below. In this example, the outer ring (
A chemical liquid passageway (41) is formed at one end side of 40);
When the inside of the outer shaft (40) becomes the sliding space of the inner shaft (42), the inside of the balloon (43) or the balloon (43)
) This is largely different from the embodiment shown in FIGS. 1 to 4 in that the chemical solution is passed from inside.

Next, an example of how to use the liquid drug injection device of the present invention will be explained.

To inject the drug solution into the balloon, insert the syringe of the syringe into the drug solution channel (2) as shown in FIGS. 7 and 8.
This is done by pressing the syringe against the Luer tapered inner peripheral surface of the lock adapter 09. At this time, the tip of the needle base of the syringe n is on the inlet side of the check valve 04). In this case, the insertion portion may be not only a Luer tapered fitting type connector but also a screw type connector. Furthermore, since the injection port is wider, the filling pressure is lower than when using a conventional injection needle, making injection easier and making it possible to complete the injection operation in a short time.

As the balloon (3) is filled with the medical solution, it expands in both the radial and axial directions. At this time, the internal air remaining in the balloon (3) is expelled to the outside through the water pressure filter (8). Also, as the balloon (3) expands, the outer shaft (2), which is tightly fitted to the inner ring (1), slides in the longitudinal direction and advances along the housing (71 surface). When filling is completed, remove the syringe from the lock adapter Gin.When filling is completed, the umbrella-shaped member (5) and the inner surface of the housing (end of the sword) fit snugly, and the balloon (3) bends when inflated and due to vibration. Bursts are prevented.

Next, as shown in FIG. 4, a group of connectors in the chemical solution outflow assembly (inside the chemical solution outflow assembly) and the inside of the lock adapter 09 are connected. At this time, the connecting pipe (34) of the connector part ■
The check valve (14) is pushed open, and the inside of the balloon (3) and the communication pipe (34) are brought into communication.

After that, it is connected to a PSv set, a balloon catheter, etc. via a connector (33) depending on the actual drug injection point, and after predetermined operations such as air bleeding are performed, the drug solution is injected into the patient's body. .

[Effects of the Invention As explained above, according to the liquid drug injection tool of the present invention,
Since the use of a needle can be omitted when injecting the medical solution into the balloon, the filling pressure during injection can be reduced, and as a result, the injection of the medical solution can be completed easily and in a short time. Furthermore, the use of an injection needle can be omitted even when the drug solution is flowing out.

[Brief explanation of drawings]

FIG. 1 is an explanatory view of one embodiment of the drug solution injection tool of the present invention, showing a state in which the drug solution injection balloon body is not connected to the drug solution outflow assembly, and FIG. 2 is a diagram showing the drug solution shown in FIG. 1. An enlarged cross-sectional view showing the medical solution injection balloon body of the injection tool when it is filled with a medical solution. FIG. 3 shows a part of the connector of the chemical solution outflow assembly shown in FIG. 1 and the luer tapered shape of the chemical solution injection balloon body. Enlarged cross-sectional view of the adapter,
FIG. 4 is a diagram showing a state in which a part of the connector shown in FIG. 3 is inserted into the Luer tapered adapter also shown in FIG. 3, and FIG. 5 is an explanatory diagram of another embodiment of the drug injection device of the present invention. Figure 6 shows the balloon body for chemical liquid injection of the chemical liquid injection tool shown in Fig. 5 when it is filled with chemical liquid. FIG. 7 is an explanatory diagram for injecting the drug solution in the syringe into the balloon, and shows the state where the syringe and the balloon body for drug solution injection are not connected. FIG. Fig. 9 is an explanatory diagram of a conventional drug injection tool, showing a state in which the drug injection needle is not actually used as a drug injection stopper; 10 is an enlarged cross-sectional view showing the balloon portion of the drug solution injection tool shown in FIG. 9 when filled with a drug solution. FIG. (Main symbols in the drawing) (1): (Tayama>: (1): (2)= (3): (7): O■: 09: ■・ (31)・ (32>) Liquid injection tool For injection of chemical liquid Balloon body drug outflow assembly Inner axis Outer axis Balloon housing cap Medical solution passage Check valve Fixed disc Seal means Lock adapter connector Part of flow control section Tube communication pipe

Claims (1)

[Scope of Claims] 1. A cylindrical outer shaft, an inner shaft housed inside the outer shaft, and a shaft provided outside the shafts so as to cover both shafts, one end of which is tightly fixed to the outer shaft. a balloon made of an elastic material, the other end of which is tightly fixed to an inner shaft; and a common drug passage for injecting and outflowing a drug solution, which communicates with the inside of the balloon, and the open end of the drug solution passage. A fitting type connector is formed in the liquid medicine passage, and prevents the liquid medicine in the balloon from flowing out when the liquid medicine is injected into the inside of the balloon, and when the liquid medicine flows out from the balloon, the open side end of the liquid medicine passage is formed. 1. A balloon body for injecting chemical liquid, characterized in that it is provided with a check valve that can be opened by a communication pipe inserted from the balloon body. 2. A cylindrical outer shaft, an inner shaft housed inside the outer shaft, and a shaft provided outside the shafts so as to cover both shafts, one end of which is closely fixed to the outer shaft, and the other end of which is fixed to the inner shaft. It consists of a balloon made of an elastic material that is closely fixed to the shaft, and a common drug passage for injecting and outflowing the drug solution, which communicates with the inside of the balloon, and a threaded connection is provided at the open end of the drug solution passage. A communication pipe is formed in the medicinal liquid passageway to prevent the medicinal liquid in the balloon from flowing out when the medicinal liquid is injected into the balloon, and is inserted from the open end of the medicinal liquid passage when the medicinal liquid flows out from the balloon. What is claimed is: 1. A balloon body for injecting chemical liquids, characterized in that the balloon body is provided with a check valve that can be opened by opening the valve. 3. The balloon body according to claim 1 or 2, wherein a sealing means is provided within the chemical liquid passage and on the inlet side of the check valve. 4 One end is provided with a connector for injecting a medical solution into the body, and the other end is provided with a fittable connector equipped with a communicating pipe long enough to communicate with the inside of the balloon, and the amount of the medical solution can be controlled. A drug solution injection tool, characterized in that the fittable connector of the drug solution outflow assembly having a flow rate control section for controlling the flow rate is fitted to the open end of the drug solution injection balloon body according to claim 1. . 5 One end is provided with a connector for injecting a medical solution into the body, and the other end is provided with a threadable connector equipped with a communicating pipe long enough to communicate with the inside of the balloon, and the amount of the medical solution can be controlled. A drug solution injection tool, characterized in that the screwable connector of the drug solution outflow assembly having a flow rate control section for controlling the drug solution outflow assembly is screwed to the open end of the drug solution injection balloon body according to claim 2. .