JPH1133124A - Liquid mixing injector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cheap liquid mixing injector with a simple structure with which a side injection liquid can be administered without back flowing or stagnating, and the liquid can be mixed and injected stably for a long period of time, and has a connector which can be easily handled. SOLUTION: A mixing/injecting inlet 2 with a rubber-type elastic part 7 and an outlet 3 are formed at both ends of this mixing injector. And the mixing injector has a tubular housing 1 and a connector 11. The housing 1 has a manifold 5 with an inlet 4 nearly at the center and a hollow cylinder 6 standing from about the base of the manifold 5 to about the mixing/injecting inlet 2. And the connector 11 has an obtuse needle 13 to be stuck into the rubber-like elastic part 7 and is connected on the side of the mixing/injecting inlet 2 detachably, slidably, and rotatably. When the connector 11 is connected deep, the top of the obtuse needle 13b is inserted into the top of the hollow cylinder 6a. And when the connector 11 is connected shallowly, a gap is formed between the top of the obtuse needle 13ba and the top of the hollow cylinder 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, when a drug solution is temporarily or long-term co-injected into an infusion line or when blood is collected from an arterial line. The present invention relates to a liquid co-injection device used by connecting a connecting device to which a part is connected.

[0002]

2. Description of the Related Art Infusion of other medical solutions during various infusions including central parenteral nutrition therapy is performed in parallel or temporarily with the infusion. In these cases, the infusion route is used. In the meantime, a method is commonly used in which a co-injection section to which an infusion line of another route is connected is provided in advance, and a drug solution is injected through the co-infusion section. As a part used in the co-injection part, a co-injection rubber tube (top rubber), a Y-type or the like liquid co-injection device (also referred to as a T-shaped tube) or a three-way cock is known.

Also, in arterial lines for continuous arterial pressure monitoring, etc., a method is also known in which a branch having substantially the same effect as that of the co-injection part is provided in the middle of the line, and blood is collected from the branch whenever necessary. Is used.
A three-way cock is generally used as a component used in the branch portion.

Of the parts used in the co-injection section, the most primitive co-injection rubber tube (top rubber) is used by a piercing doctor or nurse (hereinafter referred to as a medical worker) to accidentally stab his or her finger. Although there is a problem that it is difficult to fix in the case of long-term co-infusion and that the drug solution easily leaks when puncturing is repeated (puncture durability is low), it is still used because it is inexpensive.

The three-way stopcock has a major problem that it has a high possibility of bacterial contamination because it does not have a septum for shutting off the outside. However, it has a function of switching the injection route such as injection of the main chemical or side injection. Because the switching is convenient, it is most frequently used at present.

Accordingly, in recent years, there has been an increasing trend to pursue patient safety by preventing the invasion of bacteria from the infusion line and reducing the chance of infection, and for example, a Y-type septum having a septum for shielding the outside. The liquid co-injection device is being reviewed.

FIG. 22 is a sectional view of a typical conventional Y-type liquid co-injection device and an explanatory diagram of its operation. In the figure, 3
Reference numeral 1 denotes a housing constituting the main body of the Y-type liquid co-infusion device,
An injection port 34 which is a tubular body having a co-injection port 32 and an outflow port 33 at both ends, and which is generally formed by a branch pipe at an intermediate portion.
have. Reference numeral 35 denotes a rubber-like elastic body that seals the co-injection port 32, and reference numeral 36 denotes a cap that is fitted to the co-injection port 32 and holds the rubber-like elastic body 35 in the co-injection port 32.

[0008] The main route M is defined as the main route M on the side of the injection port 34 to which the tube 37 is connected at the tip end side.
From the tube 38 connected to the body of the patient (such as blood vessels)
Administered to Further, as shown in FIG. 22 (b), the side of the co-injection port 32 through which the injection needle 39a of the injection cylinder 39 is pierced into the rubber-like elastic body 35 is defined as a side injection route S, The one-shot side injection is performed into the patient's body from a tube 38 connected to the outlet 33 of the housing 31 through the side injection route S.

[0009]

The above-mentioned conventional liquid co-injection device has a septum that blocks the outside, that is, a rubber-like elastic body 35, so that bacteria can be prevented from entering the infusion line. Can reduce the chance of infection. However, the injection needle 39a of the syringe barrel 39 used for side injection
Since it is bare, like the co-injection rubber tube, the medical worker may pierce his / her finger by the injection needle 39a, and the injection needle 39a is punctured by the rubber-like elastic body 35. Therefore, there have been problems such as poor fixability in long-term co-injection and low puncture durability of the rubber-like elastic body 35.

In order to solve such problems of the liquid co-injection device, various inventions and ideas have been proposed. For example, Japanese Patent Publication No. Sho 62-43697 and Japanese Patent No. 25492 disclose the fixability in long-term co-infusion.
No. 23 and Japanese Utility Model Publication No. 5-22187, etc., which solve puncture durability are disclosed in JP-A-3-8355.
US Pat. No. 4,197,787 discloses a technique using a dull cannula as a measure to prevent a needle stick accident.
8 is disclosed. Further, as shown in FIG. 23, the connection part 40b of the connection part 40 having the needle part 40a pierced in the rubber-like elastic body 35 is formed in a hood shape, and the finger of the medical worker does not directly touch the needle part 40a. In the case where the liquid co-infusion device alone cannot perform its intended function, there is a liquid co-infusion with a puncture device which is the connection component 40 on the puncture side. Tools have also been proposed.

[0011] However, such a liquid co-infusion device is
Without using a device that connects to the outside such as a three-way stopcock, the infusion line is configured by combining devices that can prevent invasion of bacteria from the outside, but the possibility of bacterial contamination is high due to the following problems It cannot be replaced by a three-way stopcock with the big problem of that.

In the case of performing one-shot side injection using, for example, the injection cylinder 39 with the conventional Y-type liquid co-injection device shown in FIG. 22, the infusion route generally has a higher resistance as it goes downstream, so The chemical liquid may flow backward in the upstream direction of the main route M as shown by an arrow Z in FIG. This is a serious problem when, for example, a patient's condition changes suddenly and a cardiac or vasoactive agent is to be ordered immediately. On the other hand, in the case of a three-way stopcock, twist the cock to cut off the route to the upstream, and the medical staff pushes the plunger of the injection syringe with any force and speed, so that the drug solution can be reliably sent to the downstream, that is, the patient's body. Can be.

A conventional Y-type liquid co-injection device is shown in FIG.
As shown in (a), there is a space (hereinafter, referred to as a dead space 41) where the infusion stays with respect to the flow X of the infusion. Therefore, when a high concentration and small amount of a chemical solution is injected on the one-shot side, the chemical solution may stay in the dead space 41 and may not be administered to the patient's body. And
If the patient does not respond to the drug solution and further administers the drug solution, there is a problem that a large amount of the drug solution together with the drug solution staying in the dead space 41 will enter the patient's body. In addition, when blood collection of a patient is required and blood is collected using a Y-type liquid co-infusion device, it is meaningless to collect the blood in a state diluted with an infusion solution,
Once the blood is flowed back to the upstream of the Y-type liquid co-infusion device to fill the vicinity of the co-infusion port with undiluted patient's blood, blood is collected, and then the infused blood is applied to the blood to reverse the blood. It is common that the procedure of returning inside is taken. However, in the case of blood collection using a Y-type liquid co-infusion device, since there is a dead space 41, unless a large amount of blood is backflowed, dilution by infusion is not eliminated,
Even after the end of blood collection, there is an inconvenience that the blood inside the Y-type liquid co-infusion device must be washed away with a considerably large amount of infusion.
In particular, since it is necessary to frequently collect blood in an arterial line, such inconvenience is fatal, and a Y-type liquid co-injection device is hardly used in an arterial line currently in practical use. The dead space 41 also causes problems such as difficulty in removing bubbles generated in the middle of the infusion line and troublesome air bleeding when the infusion line is first filled with the infusion. On the other hand, in the three-way cock, these problems are small because the internal dead space 41 is small.

[0014] In order to solve the problems left in the liquid co-infusion device, various inventions and ideas have been proposed. For example, Japanese Patent Laid-Open Publication No. Hei 2-500817 and Japanese Patent Laid-Open Publication No. 3-168160 disclose a check valve provided inside a liquid co-infusion device. However, in a liquid co-injection device used as a disposable medical device, such a complicated structure is not only realistic because it cannot be manufactured at low cost, but is insufficient for the dead space 41 in the above-mentioned problem. Also, in actual infusion lines that need to be manufactured at low cost, it is conceivable to attach clamps to the tube connected upstream of the injection port of the liquid co-infusion device in advance, but the operation becomes complicated, and large quantities are required. Although the backflow can be prevented, the dead space 41 is further increased, and there is almost no effect when a small amount of a drug solution is administered.

[0015] Further, the one that minimizes the dead space 41 is disclosed in Japanese Utility Model Publication No. 6-20536 and Japanese Patent Publication No. Hei 7-1.
Although it is disclosed in Japanese Patent No. 10284, there is also a space where a chemical solution stays, which is not suitable for administering a small amount of a chemical solution,
The above problem (backflow of M to the main route) is provided.

Furthermore, the one that minimizes the dead space 41 without causing a backflow of a chemical solution or the like is disclosed in Japanese Utility Model Laid-Open Publication No. 3-11425.
Although disclosed in Japanese Patent Publication No. 2, there are problems such as poor fixation during long-term co-injection and low puncture durability (the chemical solution easily leaks).

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to prevent the invasion of bacteria and to administer a drug solution or the like by side injection without backflow and stagnation. It is an object of the present invention to provide an inexpensive liquid co-infusion device with a simple structure having a connector that is easy to handle and easy to handle and easy to use.

[0018]

A liquid co-infusion device according to the present invention has at one end a co-injection port to which a rubber-like elastic body having a slit formed substantially vertically in a substantially central portion is attached.
A branch pipe provided at the other end with an outlet having an extension tube coupled to the distal end, and a branch pipe provided at the distal end with an inlet that is branched at an almost intermediate portion and the extension tube is coupled to, from near the base of the branch pipe. It has a tubular housing with a hollow cylindrical body that stands up to the vicinity of the co-injection port and a blunt needle that is pierced into a slit in the rubber-like elastic body. And a connector that is slidably and rotatably connected.When the connector is deeply connected to the housing, the distal end of the blunt needle of the connector is attached to the distal end of the cylindrical hollow body of the housing. When it is inserted and the connection tool is connected shallowly,
A gap is formed between the tip of the blunt needle and the tip of the cylindrical hollow body.

The liquid co-infusion device according to the present invention has at one end a co-injection port to which a rubber-like elastic body having a slit formed substantially vertically at the center is attached, and an extension tube is connected to the tip. A branch pipe having an outlet at the other end, a branch at a substantially middle portion, and an injection port to which an extension tube is coupled is provided at a distal end thereof, and is erected from near the base of the branch pipe to near a co-injection port. A housing of a tubular body in which a cylindrical hollow body having a communication hole in the inner side wall is provided in the lumen, and a blunt needle pierced in a slit of the rubber-like elastic body and having a side hole in the side wall of the distal end, and a co-injection port of the housing And a connector which is detachably and slidably and rotatably connected to the side, the connector is connected to the housing, and the tip of the blunt needle of the connector is fitted into the tip of the cylindrical hollow body of the housing. When the connector is turned in one direction, When the communication hole of the cylindrical hollow body and the side hole of the blunt needle face each other, the lumen of the housing communicates with the lumen of the cylindrical hollow body, and when the connecting tool is rotated in the other direction, the side of the blunt needle The hole is closed by the side wall of the distal end of the cylindrical hollow body.

Further, in the liquid co-injection device according to the present invention, the branch pipe is provided such that its central axis is eccentric with respect to the central axis of the housing.

Further, in the liquid co-infusion device according to the present invention, the outlet of the housing is formed in a male luer-shaped male connector, and the inlet of the branch pipe is formed in a female luer-shaped female connector. .

In the liquid co-infusion device according to the present invention, the branch pipe is provided so as to be orthogonal to the housing.
It is formed by bending the outlet from the substantially middle portion of the housing in the direction opposite to the branch pipe.

In the liquid co-infusion device according to the present invention, the connecting device is formed in a cylindrical shape with a lid having an inner diameter substantially equal to the outer diameter of the outer wall of the co-injection port of the housing, and the outer wall portion is slidably and rotatably fitted. A hood portion, a blunt needle provided substantially at the center inside the top portion of the hood portion, and pierced into a slit of the rubber-like elastic body when the outer wall of the co-injection port is fitted into the hood portion; An outer wall of the hood portion and the co-injection port, which is provided at a substantially central portion of the outside of the portion, has a lumen communicating with the lumen of the blunt needle, and is formed by a connecting portion to which the side injection component or the co-injection component is connected or coupled. And holding means for holding the distal end of the blunt needle into the distal end of the cylindrical hollow body of the housing and forming a gap between the distal end of the blunt needle and the distal end of the cylindrical hollow body. It is a thing.

In the liquid co-infusion device according to the present invention, the holding means comprises:
A projection provided on the outer wall of the co-injection port of the housing, and an engagement portion including a plurality of locking holes provided on the tip side of the body of the hood portion of the connection tool and the projection is locked, When the protrusion is locked in any one of the locking holes of the engagement portion, the tip of the blunt needle of the connector is fitted into the tip of the cylindrical hollow body of the housing, and the protrusion is engaged. A gap is formed between the distal end of the blunt needle and the distal end of the tubular hollow body when the distal end of the blunt needle is engaged with another one of the engagement holes of the portion.

In the liquid co-injection device according to the present invention, the holding means is such that the protrusion provided on the outer wall of the co-injection opening of the housing and the protrusion provided on the distal end side of the body of the hood portion of the connector are fitted. And an engaging portion comprising an engaging hole for engaging the protrusion and an engaging hole for engaging the protrusion. The protrusion is fitted into the groove of the engaging portion and positioned in the groove. A gap is formed between the distal end of the blunt needle of the connector and the distal end of the cylindrical hollow body of the housing when the projection is locked in the locking hole of the engaging portion. While maintaining a state in which a gap is formed between the distal end portion and the distal end portion of the cylindrical hollow body, the distal end portion of the blunt needle is cylindrically hollow when the projection is engaged with the engagement hole of the engagement portion. It is designed to fit into the tip of the body.

Further, in the liquid co-infusion device according to the present invention, the holding means includes an external screw provided on the outer wall of the co-injection port of the housing, and an internal screw provided on the inner wall of the hood portion of the connection device and screwed with the external screw. When the inner screw is screwed deeply into the outer screw, the distal end of the blunt needle of the connecting tool abuts or fits into the distal end of the cylindrical hollow body of the housing, and the inner screw is externally screwed. The gap is formed between the distal end of the blunt needle and the distal end of the cylindrical hollow body when screwed shallow.

In the liquid co-infusion device according to the present invention, the inner wall of the distal end portion of the tubular hollow body is formed so as to be tapered or the inner diameter is increased toward the distal end. The outer wall is tapered or formed so that the outer diameter is reduced toward the distal end, and the distal end of the blunt needle is closely fitted to the distal end of the cylindrical hollow body.

Further, the liquid co-injection device according to the present invention is provided with an annular seal member made of an elastic material and made in close contact with the outer wall of the distal end of the blunt needle on the inner wall of the distal end of the cylindrical hollow body. .

In the liquid co-infusion device according to the present invention, an annular locking portion is provided on the inner wall of the distal end portion of the cylindrical hollow body.
An annular seal member made of an elastic member is provided on the outer wall of the distal end portion of the blunt needle and comes into contact with the locking portion when the distal end portion of the blunt needle is fitted into the distal end portion of the tubular hollow body.

In the liquid co-injection device according to the present invention, the lower surface of the rubber-like elastic body is formed in an arc-shaped cross section.

The liquid co-infusion device according to the present invention is obtained by imparting antibacterial properties to a rubber-like elastic body.

In the liquid co-injection device according to the present invention, the width of the gap formed between the tip of the blunt needle and the lower surface of the rubber-like elastic body is set as follows.
The thickness is in the range of 1 mm to 3 mm.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is an external view of Embodiment 1 of the present invention,
It is sectional drawing and its AA sectional drawing. In the figure, 1
Is a housing made of a transparent plastic material such as polycarbonate or TPX resin, which is a tubular body having a co-injection port 2 and an outflow port 3 at both ends, and an intermediate portion thereof. Lumen 5a in the part
Communicates with the lumen 1a of the housing 1 to form a branch pipe 5 having an inlet 4 at the tip end thereof.
For example, the inner wall of the distal end portion 6a is expanded toward the distal end, and the inner cavity 6b is communicated with the inner cavity 1a of the housing 1, for example. A tubular hollow body 6 made of a transparent plastic material such as polycarbonate or TPX resin is provided integrally.

On the outer peripheral portion of the co-injection port 2 of the housing 1, there is provided a rubber-like elastic body 7 made of a synthetic rubber material such as natural rubber or isopropylene rubber and having a slit 7a provided substantially vertically at the center. A bottomed cylindrical connecting part 8 having a projection 8a which is fixed on the upper part of the co-injection port 2 by an anchor type structure and which is engaged with an engaging part provided on a hood part of a connecting tool described later on the outer wall is integrally formed. The lower surface 7 b of the rubber-like elastic body 7, that is, the liquid-contacting surface, is provided to have repeated puncture durability, reduce the insertion resistance of a blunt needle described later, and smooth the flow of liquid such as infusion. The infusion liquid to be injected from the injection port 4 is provided between the lower surface 7b and the distal end portion 6a of the cylindrical hollow body 6 so as to have an arc-shaped cross section.
After flowing along the outer wall of
A gap G1 is provided so as to flow into the inner cavity 6b of the cylindrical hollow body 6. The width of the gap G1 differs depending on the type of the infused infusion. However, if it is too narrow, it will hinder the deformation of the rubber-like elastic body 7 when the blunt needle is inserted. Since a dead space is formed,
A range of 1 mm to 3 mm is preferred. Further, the rubber-like elastic body 7 is coated with an antibacterial agent, for example, on its surface, so that antibacterial properties are imparted.

The outflow port 3 has a bore 1 in the housing 1.
a, an extension tube 9 communicating with the lumen 5 a of the branch pipe 5 is connected to the inlet 4.
Are connected integrally, and the main liquid (infusion) passes through the extension tube 10 from the inlet 4 to the lumen 5 a of the branch pipe 5, and is transmitted through the main route M to the lumen 1 of the housing 1.
a, it is administered to a patient's body (blood vessel or the like) through the lumen 6 b of the cylindrical hollow body 6, the outlet 3 and the extension tube 9.

Reference numeral 11 denotes a connecting member which is made of a transparent plastic material such as polycarbonate or slightly soft polypropylene and is connected to the connecting portion 8 of the housing 1. The hood portion 12 is formed in a cylindrical shape, and the connecting portion 8 is slidably and rotatably fitted in the cylindrical body portion 12a.
Is provided at a substantially central portion inside the top portion of the hood portion 12,
A blunt needle 13 pierced into the slit 7a of the rubber-like elastic body 7 when the connecting portion 8 is fitted into the hood portion 12 and the outer diameter of the outer wall at the distal end portion is reduced toward the distal end; 12
Of the blunt needle 13 is provided at a substantially central portion outside the top portion of the
It has a lumen 14a communicating with 3a, and has a female luer-shaped connecting portion 14 to which a luer tip (not shown) of a mixed injection part or a side injection part, for example, a syringe barrel is connected.

A substantially T-shaped groove 15c is provided at the tip of the body 12a of the hood 12, and first and second locking holes 15a and 15b are formed at the end thereof.
Are provided, and the connecting portion 8 is provided in the groove 15 c of the engaging portion 15.
Is inserted into the first locking hole 15a.
When a is locked, the distal end portion 13b of the blunt needle 13 is fitted into the distal end portion 6a of the tubular hollow body 6 in a liquid-tight manner. When the projection 8a is locked in the second locking hole 15b, the tip 13b of the blunt needle 13 does not fit into the tip 6a of the tubular hollow body 6, and
A gap is formed between the distal end portion 13b of the blunt needle 13 and the distal end portion 6a of the tubular hollow body 6 for mixing with the infusion from the main route M. The side injection such as a high-concentration, small-volume drug solution flows through a side injection route S sent from the lumen 13a of the blunt needle 13 to the lumen 6b of the cylindrical hollow body 6 through an injection cylinder (not shown). One shot is injected into the patient's body through the outlet 3 and the extension tube 9.

In the first embodiment thus configured, when infusing the main drug solution, first, the distal end of the extension tube 9 is connected to the base (not shown) of the indwelling needle indwelled in the blood vessel of the patient. Then, as shown by an arrow X in FIG. 1D, the main chemical solution is sent from the extension tube 10 to the injection port 4 which is the main route M, and is sent from the lumen 5a of the branch pipe 5 to the lumen 1a of the housing 1. . Then, after flowing along the outer wall of the cylindrical hollow body 6 from the lower side to the upper side, a gap G between the distal end portion 6a of the cylindrical hollow body 6 and the lower surface 7b of the rubber-like elastic body 7 is formed.
1 to the lumen 6b of the tubular hollow body 6, and further through the outlet 3 and the extension tube 9 to the body (blood vessel) of the patient
Is administered. During infusion, the rubber-like elastic body 7 provided at the co-injection port 2 of the housing 1 and blocking the outside prevents bacteria from entering the infusion line.

When the side injection liquid, which is a high-concentration, small-amount liquid, is injected one-shot during the infusion of the main liquid, first, as shown in FIG. The rubber-like elastic body 7 is
The blunt needle 13 is punctured along the slit 7a to
3 is locked in the first locking hole 15a of the engaging portion 15, and the distal end 13b of the blunt needle 13 is inserted into the lumen of the distal end 6a of the cylindrical hollow body 6, as shown in FIG. 6b in a liquid-tight manner. At this time, simply fitting the hood portion 12 of the connection tool 11 to the connection section 8 causes the elasticity of the rubber-like elastic body 7 to pull back the blunt needle 13 to the connection tool 11 side, so that the blunt needle 13 The connector 11 is not easily punctured by the elastic member 7 and may not be punctured deeply even when punctured.
And the distal end portion 13b of the blunt needle 13 is liquid-tightly fitted into the lumen 6b of the distal end portion 6a of the tubular hollow body 6.

Next, as shown in FIG. 2, the luer tip 16a of the injection barrel 16 is connected to the connection portion 14 of the connecting tool 11, and as shown by the arrow Z in FIG. The injection solution is pushed from the luer tip 16a to the blunt needle 1 which is the side injection route S by pushing the plunger (not shown) of the syringe barrel 16.
After being sent to the lumen 13a of 3 and flowing into the lumen 6b of the cylindrical hollow body 6, it is injected into the patient's body (blood vessel) from the outlet 3 through the extension tube 9 on one shot side. At this time, since the distal end portion 13b of the blunt needle 13 is fitted in the lumen 6b of the distal end portion 6a of the tubular hollow body 6 in a liquid-tight manner, the blunt needle 13 and the cylindrical hollow body 6 form the main route M. The flow to the lumen 1a and the like of the housing 1 is blocked, and the backflow to the lumen 5a and the like of the branch pipe 5 is prevented, so that a dead space is not formed in the lumen 1a of the housing 1 and Side injection is smooth.

Next, when another drug solution is continuously co-injected during the infusion of the main drug solution, first, as shown in FIG.
While fitting the hood portion 12 of the connecting tool 11 to the connecting portion 8 of the housing 1, the blunt needle 13 is
a, and projecting portion 8a of connecting portion 8 is engaged with engaging portion 1.
5, and the distal end 13b of the blunt needle 13 is connected to the distal end 6 of the cylindrical hollow body 6 as shown in FIG.
The gap G2 is formed between the distal end portion 13b of the blunt needle 13 and the distal end portion 6a of the tubular hollow body 6 without being fitted into the inner cavity 6b of a. Next, as shown in FIG.
4 is connected to the distal end portion 17a of the extension tube 17, and FIG.
As shown by the arrow Z in (b), another chemical from the extension tube 17 is sent from the distal end portion 17a to the lumen 13a of the blunt needle 13 which is the side injection route S, and the main chemical from the main route M (arrow) X) while being mixed in the gap G2, is sent to the lumen 6b of the cylindrical hollow body 6, and is continuously co-injected into the patient's body (blood vessel) from the outlet 3 through the extension tube 9. At this time, since the gap G2 formed between the distal end portion 13b of the blunt needle 13 and the distal end portion 6a of the cylindrical hollow body 6 has a size that does not cause a dead space, another chemical solution from the extension tube 17 cannot be used. It does not stay in the gap G2 and is mixed and injected with the main chemical solution from the main route M.

When the side injection is performed continuously, as shown in FIG. 6, the injection cylinder 16 used in the one-shot side injection is used.
Instead, the extension tube 17 used for continuous co-injection is connected to the connection portion 14 of the connection tool 11, and the distal end portion 13 b of the blunt needle 13 has a cylindrical shape as in the case of the one-shot side injection shown in FIG. The hood portion 12 of the connection tool 11 is firmly fitted to the connection portion 8 of the housing 1 so as to be fitted into the lumen 6b of the distal end portion 6a of the hollow body 6 in a liquid-tight manner, and the projection 8a of the connection portion 8 is engaged. It is locked in the first locking hole 15a of the portion 15. Then
As shown by an arrow Z in FIG. 6B, the side injection liquid from the extension tube 17 is sent from the distal end portion 17 a to the lumen 13 a of the blunt needle 13 which is the side injection route S, and the lumen of the cylindrical hollow body 6 is transmitted. After flowing to 6b, it is continuously injected into the patient's body (blood vessel) from the outlet 3 through the extension tube 9. At this time, the flow of the side liquid from the extension tube 17 to the lumen 1a of the housing 1 which is the main route M is blocked by the blunt needle 13 and the cylindrical hollow body 6, and the lumen 5a of the branch pipe 5 Backflow is prevented. Also, since no dead space is formed,
The side injection liquid is surely injected without staying.

Further, when blood is collected, similarly to the case of the one-shot side injection shown in FIG. 2, the distal end 13b of the blunt needle 13 is placed in the lumen 6b of the distal end 6a of the cylindrical hollow body 6. A connection tool 11 is connected to the connection portion 8 of the housing 1 so as to fit tightly.
Of the connecting portion 8 is locked in the first locking hole 15 a of the engaging portion 15. Next, the luer tip 16a of the injection barrel 16 is connected to the connecting portion 14 of the connecting tool 11, and the lumen 13a of the blunt needle 13 passes through the upstream of the housing 1, that is, through the extension tube 9 and the lumen 6b of the tubular hollow body 6. The blood is allowed to flow back to around, and undiluted blood is collected with the syringe 16. After collection,
The infusion is caused to flow by another syringe barrel 16 and the backflowed blood is returned into the blood vessel. At this time, the flow of the blood from the extension tube 9 to the lumen 1a of the housing 1, which is the main route M, is cut off by the blunt needle 13 and the cylindrical hollow body 6, and the blood flows into the lumen 5a of the branch pipe 5 to the lumen 5a. Since the backflow is prevented and a dead space is not formed, the blood can be collected by flowing the necessary minimum amount of blood to the housing 1 side, and the blood in the housing 1 can be washed away with a minimum infusion even after the blood collection.

As described above, the cylindrical hollow body 6 is integrally provided in the lumen 1a of the housing 1 of the liquid co-injection device, and the blunt needle 13 which is slidably and rotatably fitted to the connecting portion 8 of the housing 1 is provided. After the connection tool 11 is securely fitted to the connection section 8, the projection 8 a of the connection section 8 is inserted into the first locking hole 15 a of the engagement section 15 provided on the connection tool 11.
Is locked, the distal end 13b of the blunt needle 13 is fitted into the distal end 6a of the cylindrical hollow body 6 in a liquid-tight manner, and the first locking hole 15
b when the projection 8a is locked to the distal end 1 of the blunt needle 13.
Since the gap G2 for mixing with the infusion from the main route M is formed between the cylindrical hollow body 6 and the distal end portion 6a of the cylindrical hollow body 6, when performing one-shot side injection, the cylindrical hollow body 6 Due to the distal end portion 6a and the distal end portion 13b of the blunt needle 13 fitted in the lumen 6b of the distal end portion 6a in a liquid-tight manner, the side injection liquid flows backward to the main route M side or a dead space is formed. Disappears, it is possible to reliably administer the side injection solution to the patient's body at any speed from the medical staff,
When the patient does not respond to the side injection solution and additionally administers the side injection solution, there is no possibility that a large amount of the side injection solution together with the side injection solution remaining in the dead space may enter the blood vessel of the patient. Also,
Even in the case of blood collection, since no dead space is formed, it is possible to collect blood by backflowing a minimum necessary amount of blood, and after collection, the housing 1 and the like can be washed away with a minimum infusion. This is very convenient in arterial lines that require frequent blood sampling. The same effect can be obtained in removing bubbles or removing air.

Further, when performing continuous co-injection, the main chemical and other chemicals are mixed in a gap G2 formed between the tip 13b of the blunt needle 13 and the tip 6a of the cylindrical hollow body 6. However, since the size of the gap G2 is such that a dead space is not formed, other chemicals do not stay in the gap G2 and can be reliably administered to the patient's body. Also,
In the case of continuous side injection or co-injection, there is a problem in fixing the extension tube 17 that sends side injection or the like to the housing 1. However, the connecting tool 11 to which the extension tube 17 is connected can be easily connected to the connection portion 8 of the housing 1. Connectable and protruding portion 8a of connecting portion 8
The connector 11 is securely locked by the engaging portion 15 of the connector 11 and can maintain the state, so that the connector 11 having high fixability in long-term side injection or co-infusion can be obtained, and the liquid which can be easily handled is provided. A co-infusion device can be obtained.

The needle pierced into the rubber-like elastic body 7 of the housing 1 is a blunt needle 13, and the blunt needle 13 is
Is provided on the connecting device 11 so as to be surrounded by the hood portion 12 of the medical worker, so that the medical worker does not pierce his / her own finger with a sharp injection needle as in the related art, and the convenient connecting device 11 can be obtained. it can. Furthermore, since the rubber-like elastic body 7 has antibacterial properties, it is possible to reliably prevent bacteria from entering the infusion line.

It should be noted that the first embodiment has the connecting portion 14 for connecting the injection tube 16 used for one-shot side injection and the extension tube 17 used for continuous co-injection. Although the description has been given by exemplifying the connecting device 11 capable of coping with various kinds of work, the present invention is not limited to this. For example, when performing continuous side note or continuous co-injection,
As shown in FIG.
The connecting tool 11A provided with the connecting portion 18 to which the connecting portion 7 is connected may be used by connecting to the connecting portion 8 of the housing 1. When one-shot side injection is performed, long-term fixing is not required. As shown in FIG. 8, the connector 11B having the blunt needle 13 and the connecting portion 14 by omitting the hood portion 12
May be connected to the rubber-like elastic body 7 of the housing 1 for use. In these cases, almost the same effects are obtained. Further, in the connection tool 11A shown in FIG. 7, an engagement portion 15A to which the projection 8a of the connection portion 8 of the housing 1 is locked.
Is provided with a substantially L-shaped groove 15c, a first locking hole 15a is formed at one end thereof, and a second locking hole 15b is formed substantially at the center.
However, the present invention is not limited to this, and can be appropriately changed.
It has almost the same operation and effect as.

Embodiment 2 FIG. 9 is an external view of a connector according to Embodiment 2 of the present invention. This Embodiment 2
In the connector 11 according to the first embodiment, the housing 1
A substantially L-shaped groove 30c is provided in place of the engaging portion 15 at which the projection 8a of the connecting portion 8 is locked, and the locking hole 3 is provided at one end thereof.
0a, an engaging hole 30b is formed at a substantially middle corner, and when the projection 8a of the connecting portion 8 is fitted into the groove 30c, the distal end portion 13b of the blunt needle 13 and the cylindrical hollow portion are formed. A gap G2 for mixing with the infusion from the main route M is formed between the distal end portion 6a of the body 6 and the mixture injection priority state, and the locking hole 30 is formed.
a when the projection 8a is locked to the distal end 1 of the blunt needle 13.
When the mixed injection priority state in which the gap G2 is formed between the end portion 3b and the distal end portion 6a of the cylindrical hollow body 6 is maintained (locked state), and the projection 8a is engaged with the engagement hole 30b, the dullness becomes blunt. The distal end portion 13 b of the needle 13 is provided with an engaging portion 30 which is fitted into the inner cavity 6 b of the distal end portion 6 a of the cylindrical hollow body 6 in a liquid-tight manner and is in the side injection priority state. In the second embodiment, the housing 1 of the Y-type liquid co-infusion device described in the first embodiment is provided.

In the second embodiment configured as described above, similarly to the case described in the first embodiment, when another drug solution is continuously co-injected during the infusion of the main drug solution,
First, the blunt needle 13 is punctured in the rubber-like elastic body 7 along the slit 7a while the hood portion 12 of the connecting tool 11 is fitted to the connecting portion 8 of the housing 1, and the projection 8a of the connecting portion 8 is engaged. The gap G <b> 2 is formed between the distal end portion 13 b of the blunt needle 13 and the distal end portion 6 a of the cylindrical hollow body 6 by being locked in the locking hole 30 a of the portion 30. At this time, the action of pulling the blunt needle 13 back to the connecting tool 11 by the elasticity of the rubber-like elastic body 7 acts, and the blunt needle 13
Is difficult to puncture, and may not be punctured deeply even when puncturing. Therefore, when connecting the connecting tool 11 to the connecting portion 8, the protrusion 8a of the connecting portion 8 is fitted into the groove 30c, and then the engaging hole 3 is formed.
The connector 11 is slid until it engages with 0b, and the distal end 13b of the blunt needle 13 is once fitted into the lumen 6b of the distal end 6a of the tubular hollow body 6. After the fitting, the connecting member 11 is rotated to
a is locked in the locking hole 30a so that the co-infusion priority state is maintained.

Next, the distal end portion 17a of the extension tube 17 is connected to the connection portion 14 of the connection tool 11, and
Is continuously mixed into the patient's body (blood vessel) while being mixed with the main drug solution from the main route M in the gap G2.

During the continuous co-injection, when the side injection liquid is to be injected one-shot, the connector 11 is slid and rotated to engage the projection 8a of the connection portion 8 with the engagement hole 30b. ,
The distal end portion 13b of the blunt needle 13 is fitted into the lumen 6b of the distal end portion 6a of the tubular hollow body 6 in a liquid-tight manner to set the side injection priority state. At this time, for example, when the medical worker loosens his hand to release the engagement of the projection 8a into the engagement hole 30b, the elasticity of the rubber-like elastic body 7 causes the blunt needle 13 to be pulled back to the connecting device 11 side. Works, the distal end portion 13b of the blunt needle 13 comes off from the distal end portion 6a of the cylindrical hollow body 6, and a gap G2 is formed between the distal end portion 13b and the distal end portion 6 of the cylindrical hollow body 6. The projection 8a is securely engaged with the engagement hole 30b.

Next, the luer tip 16a of the injection tube 16 is connected to the connection portion 14 of the connection tool 11, and the side injection liquid in the injection tube 16 is injected one-shot into the body (blood vessel) of the patient. After the side injection, the connector 11 is rotated and slid while releasing the engagement of the projection 8a with the engagement hole 30b, and the projection 8a is locked into the locking hole 3.
0a and the distal end portion 13b of the blunt needle 13 and the cylindrical hollow body 6
A gap G2 is formed between the front end portion 6 and the front end portion 6, and the co-infusion priority state is set again.

As described above, when the projection 8a of the connecting portion 8 is fitted in the groove 30c, the tip 13 of the blunt needle 13
A gap G2 is formed between the end portion b of the cylindrical hollow body 6 and the tip end portion 6a of the hollow cylindrical member 6, so that a priority is given to the co-injection.
Is locked, the co-injection priority state is maintained, and when the projection 8a is engaged with the engagement hole 30b, the distal end 13b of the blunt needle 13 is in the lumen of the distal end 6a of the cylindrical hollow body 6. 6b, the connecting portion 11 is provided with the engaging portion 30 which is fitted in a liquid-tight manner to be in the side injection priority state.
When the side injection is performed, the protrusion 8a is engaged with the engaging hole 30b to intentionally set the side injection priority state. In such a case, it is possible to prevent the user from accidentally setting the side note priority state or performing the co-injection in the side note priority state without noticing the user, thereby obtaining the easy-to-use connector 11.

In the above-described second embodiment, the case where the groove 30c of the engaging portion 30 of the connecting tool 11 is substantially L-shaped is shown. However, the present invention is not limited to this. For example, FIG. As described above, the groove 30c of the engagement portion 30A may be formed in a substantially inverted C shape. In this case, an engagement hole 30b is formed at the upper end, and the engagement hole 30b is formed at the end of the groove branched to the substantially middle portion.
a is formed, and the protrusion 8 a of the connecting portion 8 is
0b, so that substantially the same operation and effect as in the second embodiment can be obtained, and at the time of fitting of the connecting tool 11 to the connecting portion 8,
The blunt needle 13 is reliably punctured by the rubber-like elastic body 7, and it is possible to prevent insufficient puncturing due to the elasticity of the rubber-like elastic body 7 and to prevent the blunt needle 13 from coming off.

Embodiment 3 FIG. 11 is an external view and a sectional view of a third embodiment of the present invention. In the third embodiment, in the housing 1 of the Y-type liquid co-infusion device according to the first embodiment, the outflow port 3 to which the extension tube 9 is coupled is formed in the male connector part 19 having a male luer shape, and the extension tube is formed. An injection port 4 portion of the branch pipe 5 to which 10 is connected is formed in a female luer-shaped female connector section 20,
In addition to the extension tubes 9 and 10, the female connector section 20 is connected to the luer tip 16a of the syringe barrel 16 or the male connector section 19 of another liquid co-injection device having the same shape, and a plurality of infusion lines are connected to one infusion line. The mixed injection line is connected. In the third embodiment, the connector 11 described in the first embodiment is provided.

With such a configuration, substantially the same operations and effects as those of the first embodiment can be obtained.
When it is necessary to connect multiple co-infusion lines to one infusion line in the management of critically ill patients receiving treatment in an (intensive care unit) etc., the outflow port 3 and the infusion port 4 must be connected by a male connector. By forming the part 19 and the male connector part 20 respectively, a medical worker can arbitrarily connect and use a plurality of Y-type liquid co-infusion devices according to the second embodiment according to the medical condition of a patient, and can perform treatment. A highly versatile liquid co-infusion device that can be performed smoothly can be obtained.

Embodiment 4 FIG. FIG. 12 is an external view and a sectional view of a fourth embodiment of the present invention.
In the housing 1 of the Y-type liquid co-infusion device according to the third embodiment, the branch pipe 5 is provided so as to be orthogonal to the housing 1, and the outlet 3 side is connected from a substantially middle portion of the housing 1 to the branch pipe 5. Is bent so as to be substantially perpendicular to the housing 1 in the opposite direction to that of the housing 1, so that the overall shape is substantially inverted T-shaped. In the fourth embodiment, the connector 11 described in the first embodiment is provided.

With this configuration, substantially the same operation and effect as those of the first embodiment can be obtained.
Similarly to the case described in the above, when it is necessary to connect a plurality of co-infusion lines to one infusion line, the infusion line (main route M) can be configured linearly. It is easy to arrange, it is possible to prevent erroneous administration of the chemical solution, etc., and it is possible to obtain a highly versatile liquid co-infusion device.

In the fourth embodiment, the branch pipe 5
Is orthogonal to the housing 1, and the outlet 3 side from the middle part of the housing 1 is bent in a direction opposite to the branch pipe 5 so as to be substantially perpendicular to the housing 1 so that the overall shape is substantially an inverted T-shape. Although the case of the liquid co-injection device is shown, as shown in FIG. 13, the outflow port 3 side and the branch pipe 5 may be configured to be substantially straight. Further, in the housing 1 shown in FIG. 13, the connecting portion 8 is formed integrally with the outer peripheral portion of the co-injection port 2, and the rubber-like elastic body 7 is deformed by inserting the blunt needle 13 into the outer peripheral surface of the rubber-like elastic body 7. A corresponding recess 7c is provided. With this configuration, substantially the same effect can be obtained.

Embodiment 5 FIG. FIG. 14 is an external view, a sectional view, and a BB sectional view of Embodiment 5 of the present invention.
In the fifth embodiment, in the housing 1 of the Y-type liquid co-infusion device according to the first embodiment, the branch pipe 5 is provided with the center axis of the housing 1 and the center axis of the branch pipe 5 eccentric, and the cylindrical pipe is formed. The width of the gap G3 formed between the distal end portion 6a of the hollow body 6 and the lower surface 7b of the rubber-like elastic body 7 is set to be equal to the width of the distal end portion 6a of the cylindrical hollow body 6 and the rubber-like elastic body 7 of the first embodiment. It is formed to be larger than the width of the gap G1 formed between the lower surface 7b. In the fifth embodiment, the first embodiment is used.
Is provided.

With this configuration, substantially the same operation and effect as those of the first embodiment can be obtained, and the eccentrically provided branch pipe 5 allows the housing 1 to extend from the extension tube 10 through the lumen 5a of the branch pipe 5. As shown by arrows X in FIGS. 14 (b) and (c), the main chemical solution sent to the inner cavity 1a along the upper wall while swirling the outer wall of the cylindrical hollow body 6 from below. The flow is sent to the lumen 6b of the tubular hollow body 6. Due to this spiral flow, even when the width of the gap G3 is made large, the main chemical liquid is reliably sent to the lumen 6b of the cylindrical hollow body 6 without forming a dead space, and when the housing 1 is first filled with the infusion liquid. A case in which a large gap G3 between the distal end portion 6a of the cylindrical hollow body 6 and the lower surface 7b of the rubber-like elastic body 7 is required, for example, such as the connector 11B shown in FIG. In this case, an effective liquid co-infusion device can be obtained.

Embodiment 6 FIG. FIG. 15 is an operation explanatory view showing a cross section of the sixth embodiment of the present invention and an external view of a connecting tool therefor. In the sixth embodiment, in the housing 1 of the Y-type liquid co-injection device according to the first embodiment, a communication hole 6c communicating with the lumen 1a of the housing 1 is provided in a side wall of a distal end portion of the cylindrical hollow body 6. In the connecting tool 11, a side hole 13c is provided in the tip end side wall of the blunt needle 13, and the connecting tool 11 is fitted into the connecting portion 8 of the housing 1, and the blunt needle 13
Is the inner cavity 6b of the distal end 6a of the cylindrical hollow body 6.
When the connector 11 is fitted into the hole, the side hole 13c is opposed to the communication hole 6c and is opened to the lumen 1a by being rotated, or is closed by the distal end side wall of the tubular hollow body 6. It is configured as follows. In the sixth embodiment, the engaging portion 15B provided on the connecting tool 11 and engaged with the projecting portion 8a of the connecting portion 8 of the housing 1 is not shown in FIG.
As shown in (b), a substantially T-shaped groove 15c is provided, and when the protrusion 8a is locked at one end thereof, the side hole 13c is formed.
Are formed, and a second locking hole 15b is formed at the other end to close the side hole 13c when the projection 8a is locked. It has substantially the same effect as the engaging portion 15 according to the first embodiment.

In the sixth embodiment configured as described above, similarly to the case described in the first embodiment, when the side injection is one-shot side injection during the infusion of the main chemical solution,
First, while the hood portion 12 of the connection tool 11 is firmly fitted to the connection portion 8 of the housing 1, the blunt needle 1 is attached to the rubber-like elastic body 7.
3 is punctured along the slit 7a, the projection 8a of the connecting portion 8 is fitted into the engaging portion 15, and the distal end 13b of the blunt needle 13 is inserted.
Into the inner cavity 6b of the distal end portion 6a of the tubular hollow body 6 in a liquid-tight manner. Then, the connection tool 11 is rotated to make the protrusion 8a the second.
After the side hole 13c of the blunt needle 13 is closed by the side wall of the distal end of the tubular hollow body 6, the connecting tool 1
The luer tip 16a of the injection tube 16 is connected to the first connection portion 14, and the side injection solution in the injection tube 16 is injected one-shot into the body (blood vessel) of the patient.

When continuous co-injection is performed using a liquid co-injection device that has been subjected to one-shot side injection, as shown in FIG. 8a
Is locked in the first locking hole 15a, and the side hole 13 of the blunt needle 13 is
c is opened to the lumen 1a so as to face the communication hole 6c,
The distal end 1 of the extension tube 17 is connected to the connecting portion 14 of the connecting tool 11.
7a is connected, and another drug solution from the extension tube 17 is continuously co-injected into the patient's body (blood vessel). At this time, the main chemical from the main route M passes through the communication hole 6c of the cylindrical hollow body 6 and the side hole 13c of the blunt needle 13 from the lumen 1a of the housing 1 as shown by an arrow X in FIG. Then, it is sent to the lumen 6b of the cylindrical hollow body 6 and mixed with another drug solution (arrow Z) from the lumen 13a of the blunt needle 13 to be co-injected.

As described above, the communication hole 6c is provided on the side wall of the distal end of the cylindrical hollow body 6, and the side hole 13c is provided on the side wall of the distal end of the blunt needle 13.
Is configured to be opened or closed, so that the injection route can be easily switched for each administration such as side injection priority infusion administration such as one-shot side injection or mixed drug administration such as continuous co-infusion, and the connection device 11 is obtained. This makes it possible to obtain a liquid co-infusion device which is easy to use and easy to use.

Embodiment 7 FIG. 16 is an external view of a seventh embodiment of the present invention and an explanatory diagram of its operation. In the seventh embodiment, in the housing 1 of the Y-type liquid co-infusion device according to the first embodiment, the connecting portion 8 is formed integrally with the outer peripheral portion of the co-injection port 2, and the connecting portion 8 is provided above the co-injection port 2. Instead of the rubber-like elastic body 7 having an anchor-type structure and a lower surface 7b having an arc-shaped cross section, a slit 21a substantially perpendicular to the center is provided.
A rubber-like elastic body 21 having a substantially rectangular cross section and a lower surface 21b formed flat is ultrasonically welded by a cap-like pressing member 22 fitted to the upper end of the housing 1 above the co-injection port 2. A plurality of ribs 23 are provided on the outer wall of the connecting portion 8 and serve as guides when the hood portion 12 of the connecting tool 11 is fitted. Note that one of the ribs 23 is provided with a protruding portion 8a that is engaged with the engaging portion 15 of the connection tool 11. As shown in FIG. 17, the inner wall of the distal end portion 6a of the cylindrical hollow body 6 and the outer wall of the distal end portion 13b of the blunt needle 13
The tip 13b of the blunt needle 13 is formed in a tapered shape.
When they fit into the inner cavity 6b of the distal end portion 6a of the cylindrical hollow body 6, they guide each other and are fitted in a liquid-tight manner by a tapered wedge action.

With this configuration, substantially the same operations and effects as those of the first embodiment can be obtained.
Is the inner cavity 6b of the distal end 6a of the cylindrical hollow body 6.
When they are fitted into the taper, both tapered 13,
6 can be easily and liquid-tightly tightly fitted by the wedge action, whereby the inner cavity 1 of the housing 1 for side injection is provided.
Thus, the backflow to the lumen 5a and the like of the branch pipe 5 can be prevented, and the side injection can be surely administered to the patient's body.

Embodiment 8 FIG. FIG. 18 is an external view showing a part of the eighth embodiment of the present invention in cross section and its operation explanatory view. The eighth embodiment is different from the seventh embodiment in that the rubber-like elastic body 21 of the seventh embodiment is replaced by a substantially vertical slit 2
4a, a rubber-like elastic body 24 formed in a complicated shape in advance by compression molding and having a lower surface 24b having an arc-shaped cross section.
An upper portion of the co-injection port 2 is attached by an ultrasonic welding method with a cap-shaped pressing member 22 fitted to an upper end portion of the housing 1, and a projection 8 a and a rib 23 of the connecting portion 8 are omitted, and an outer wall of the connecting portion 8 is omitted. Is provided with two external threads 25 which also serve as a guide and a fixing when the hood part 12 of the connecting tool 11 is fitted, the engaging part 15 of the connecting tool 11 is omitted, and the outer screw 25 is screwed on the inner wall of the hood part 12. The two inner screws 26 to be combined are provided. In the eighth embodiment, the inner wall of the distal end portion 6a of the cylindrical hollow body 6 and the outer wall of the distal end portion 13b of the blunt needle 13 are not formed in a tapered shape, and the cylindrical hollow body 6 according to the first embodiment is not formed. And the distal end portion 13b of the blunt needle 13 is easily fitted almost in the same manner as the distal end portion 13a of the blunt needle 13. When the connecting tool 11 is screwed deeply into the connecting portion 8, the distal end portion 13b of the blunt needle 13 When abutting or fitting into the distal end portion 6a of the cylindrical hollow body 6 and screwing it into a shallow shape, a gap G is provided between the distal end portion 13b of the blunt needle 13 and the distal end portion 6a of the cylindrical hollow body 6.
2 are formed.

With this configuration, substantially the same operation and effect as those of the seventh embodiment can be obtained, and the connection of the connector 11 to the housing 1 is performed by screwing the outer screw 25 of the housing 1 to the inner screw 26 of the connector. By adjusting the degree of screwing, the distal end 13b of the blunt needle 13 and the distal end 6 of the tubular hollow body 6 can be adjusted.
Since the width of the gap G2 formed between the main solution and the other solution can be appropriately changed, for example, in continuous co-injection.

Embodiment 9 FIG. 19 is an enlarged sectional view of a main part according to the ninth embodiment of the present invention. This embodiment 9
In the cylindrical hollow body 6 provided in the housing 1 of the Y-type liquid co-infusion device according to the first embodiment, the inner wall of the distal end portion 6a is softer than the material forming the cylindrical hollow body 6 or the blunt needle 13, for example. An O-ring 27 made of a suitable material or an elastic material such as rubber is provided.

With this configuration, substantially the same operation and effect as those of the first embodiment can be obtained. For example, the tip portion 13b of the blunt needle 13 is replaced with the tip portion of the cylindrical hollow body 6 in order to perform one-shot side injection. When fitted into the lumen 6b of the
The ring 27 and the outer wall of the distal end portion 13b of the blunt needle 13 are in close contact with each other,
The liquid-tight sealing property between the cylindrical hollow body 6 and the blunt needle 13 can be improved. In general, a liquid co-injection device is replaced with a new one in about two weeks for reasons such as prevention of infection and clogging of a filter included in an infusion line.
Although the durability by repeatedly fitting the distal end portion 13b of the cylindrical hollow body 6 into the lumen 6b does not pose a problem, the use of a liquid co-infusion device or the like may be continued for a long time with the development of home medical care. In such a case, durability by repeated fitting is necessary, and this durability can be maintained by providing the O-ring 27 on the inner wall of the distal end portion 6a of the cylindrical hollow body 6.

In the above-described ninth embodiment, the case where the O-ring 27 is provided on the inner wall of the distal end portion 6a of the cylindrical hollow body 6 to make the outer wall of the distal end portion 13b of the fitted blunt needle 13 adhere to the inner wall. However, as described in the seventh embodiment, the inner wall of the distal end portion 6a of the tubular hollow body 6 and the distal end portion 1 of the blunt needle 13 are described.
When the outer wall of 3b is formed in a tapered shape, as shown in FIG. 20, when the distal end portion 13b of the blunt needle 13 is fitted into the lumen 6b of the distal end portion 6a of the tubular hollow body 6, the blunt needle 13 The inner wall of the distal end portion 6a of the cylindrical hollow body 6 with which the distal end contacts
A ring 27 may be provided, and as shown in FIG. 21, an annular member 28 made of an elastic material such as rubber is provided on an outer wall of a distal end portion 13 b of the blunt needle 13, and a distal end of the cylindrical hollow body 6 is provided. When the distal end portion 13b of the blunt needle 13 is fitted into the inner cavity 6b of the distal end portion 6a of the cylindrical hollow body 6, the annular portion abuts on an annular member 28 provided on the outer wall of the distal end portion 13b of the blunt needle 13 An engaging portion 29 may be provided. In these cases, a similar effect is obtained.

[0073]

As described above, the liquid co-infusion device according to the present invention has at one end a co-infusion port to which a rubber-like elastic body having a slit formed substantially vertically at the center is attached.
A branch pipe provided at the other end with an outlet having an extension tube coupled to the distal end, and a branch pipe provided at the distal end with an inlet that is branched at an almost intermediate portion and the extension tube is coupled to, from near the base of the branch pipe. It has a tubular housing with a hollow cylindrical body that stands up to the vicinity of the co-injection port and a blunt needle that is pierced into a slit in the rubber-like elastic body. And a connector that is slidably and rotatably connected.When the connector is deeply connected to the housing, the distal end of the blunt needle of the connector is attached to the distal end of the cylindrical hollow body of the housing. When it is inserted and the connection tool is connected shallowly,
Since a gap is formed between the tip of the blunt needle and the tip of the tubular hollow body, in the case of side injection, the tip of the tubular hollow body and the blunt needle fitted into the tip thereof With the above-mentioned tip portion, the side injection from the blunt needle does not flow back to the branch tube side, and can be reliably administered to the patient's body without forming a dead space. In addition, in the case of blood collection, it is possible to collect blood by backflowing the minimum necessary blood because no dead space is formed, and it is possible to wash it with minimal infusion after collection, so blood collection is required frequently. It is very convenient in the arterial line. Furthermore, removal of air bubbles or removal of air can be easily performed.

In the case of continuous co-injection, the main chemical and other chemicals are formed in the gap between the tip of the blunt needle formed when the connector is connected shallowly and the tip of the cylindrical hollow body. However, since the size of this gap is such that no dead space is formed, the main drug solution and other drug solutions do not stay in the gap and can be reliably administered to the patient's body.

Thus, it is possible to obtain a liquid co-injection device having a simple structure and inexpensively causing no backflow and having no dead space.

The liquid co-infusion device according to the present invention has at one end a co-injection port to which a rubber-like elastic body having a slit formed substantially vertically at the center is attached, and an extension tube is connected to the tip. A branch pipe having an outlet at the other end, a branch at a substantially middle portion, and an injection port to which an extension tube is coupled is provided at a distal end thereof, and is erected from near the base of the branch pipe to near a co-injection port. A housing of a tubular body in which a cylindrical hollow body having a communication hole in the inner side wall is provided in the lumen, and a blunt needle pierced in a slit of the rubber-like elastic body and having a side hole in the side wall of the distal end, and a co-injection port of the housing And a connector which is detachably and slidably and rotatably connected to the side, the connector is connected to the housing, and the tip of the blunt needle of the connector is fitted into the tip of the cylindrical hollow body of the housing. When the connector is turned in one direction, When the communication hole of the cylindrical hollow body and the side hole of the blunt needle face each other, the lumen of the housing communicates with the lumen of the cylindrical hollow body, and when the connecting tool is rotated in the other direction, the side of the blunt needle The hole is closed by the side wall of the distal end of the cylindrical hollow body, so that the injection route can be switched for each administration, such as side injection priority infusion administration such as one-shot side injection, or drug mixture administration such as continuous co-infusion. It is possible to obtain a connection device that can be easily performed, and it is possible to obtain a liquid co-infusion device that is easy to use and easy to use.

Further, in the liquid co-infusion device according to the present invention, since the branch pipe is provided with the center axis thereof eccentric with respect to the center axis of the housing, the chemical solution sent to the lumen of the housing through the branch pipe is provided. It flows along the outer wall of the cylindrical hollow body while spiraling upward from below, and this spiral flow causes the gap formed between the distal end of the cylindrical hollow body and the lower surface of the rubber-like elastic body to flow. A housing in which a dead space is not formed even when the width is large can be formed, and air can be easily removed, and a liquid co-injection device that is effective when using a connection device that requires a large gap can be obtained.

Further, in the liquid co-injection device according to the present invention, the outlet portion of the housing is formed in the male luer-shaped male connector portion, and the injection port portion of the branch pipe is formed in the female luer-shaped female connector portion. The liquid co-infusion device can be connected to each other, and is particularly effective when it is necessary to connect a plurality of co-infusion lines to one infusion line, and a highly versatile liquid co-infusion device can be obtained.

In the liquid co-infusion device according to the present invention, the branch pipe is provided so as to be orthogonal to the housing.
Since the outlet side is bent from the substantially middle part of the housing in the direction opposite to the branch pipe, a plurality of liquid co-infusion devices can be connected linearly, and in particular, a plurality of co-infusion lines can be connected to one infusion line. A highly versatile liquid co-infusion device that can be configured in a straight line for infusion lines when connection is necessary, makes it easier to organize multiple co-infusion lines, and prevents erroneous administration of chemicals, etc. be able to.

In the liquid co-infusion device according to the present invention, the connecting device has a closed cylindrical shape whose inner diameter is substantially equal to the outer diameter of the outer wall of the co-injection port of the housing and whose outer wall portion is slidably and rotatably fitted. A hood portion, a blunt needle provided substantially at the center inside the top portion of the hood portion, and pierced into a slit of the rubber-like elastic body when the outer wall of the co-injection port is fitted into the hood portion; An outer wall of the hood portion and the co-injection port, which is provided at a substantially central portion of the outside of the portion, has a lumen communicating with the lumen of the blunt needle, and is formed by a connecting portion to which the side injection component or the co-injection component is connected or coupled. And holding means for holding the distal end of the blunt needle into the distal end of the cylindrical hollow body of the housing and forming a gap between the distal end of the blunt needle and the distal end of the cylindrical hollow body. Therefore, the housing of the connecting device to which the side-ordered parts or co-injected parts are connected or joined Of the housing and the holding means provided on the outer wall of the co-injection port of the housing and the connecting device can maintain the connection between the two, and the fixing property of the connecting device to the housing during long-term side injection or co-injection can be improved. It is possible to obtain an inexpensive liquid co-infusion device which is high in price, has a simple structure and is easy to handle. Further, the needle pierced into the rubber-like elastic body of the housing is a blunt needle, and since the blunt needle is provided so as to be surrounded by the hood portion of the connector,
Unlike a conventional case, a medical worker does not pierce his or her finger with a sharp injection needle, and a convenient connector can be obtained.

In the liquid co-infusion device according to the present invention, the holding means comprises:
A projection provided on the outer wall of the co-injection port of the housing, and an engagement portion including a plurality of locking holes provided on the tip side of the body of the hood portion of the connection tool and the projection is locked, When the protrusion is locked in any one of the locking holes of the engagement portion, the tip of the blunt needle of the connector is fitted into the tip of the cylindrical hollow body of the housing, and the protrusion is engaged. Since the gap is formed between the distal end of the blunt needle and the distal end of the cylindrical hollow body when locked in any one of the other locking holes of the portion,
A liquid co-infusion device having a connector that can be easily connected and maintained in a connected state by a projection of the housing and an engagement portion of the connector and that can be fixed to the housing for a long period of time. Can be.

Further, in the liquid co-infusion device according to the present invention, the holding means is such that the protrusion provided on the outer wall of the co-injection port of the housing and the protrusion provided on the tip end side of the body of the hood portion of the connector are fitted. And an engaging portion comprising an engaging hole for engaging the protrusion and an engaging hole for engaging the protrusion. The protrusion is fitted into the groove of the engaging portion and positioned in the groove. A gap is formed between the distal end of the blunt needle of the connector and the distal end of the cylindrical hollow body of the housing when the projection is locked in the locking hole of the engaging portion. While maintaining a state in which a gap is formed between the distal end portion and the distal end portion of the cylindrical hollow body, the distal end portion of the blunt needle is cylindrically hollow when the projection is engaged with the engagement hole of the engagement portion. As it is designed to fit into the tip of the body, when the protrusion is located in the groove of the engagement part, the co-infusion priority state is set. Want to perform co-injection by engaging the locking hole of the joint to set the co-injection priority state, and when performing side injection, the projection can be engaged with the engagement hole to intentionally set the co-infusion priority state. In such a case, the side injection priority state is not erroneously set, and the co-infusion is not performed unnoticed in the side injection priority state, so that a liquid co-injection device having an easy-to-use connector can be obtained.

Further, in the liquid co-injection device according to the present invention, the holding means includes an external screw provided on the outer wall of the co-injection port of the housing and an internal screw provided on the inner wall of the hood portion of the connection device, and the external screw being screwed. When the inner screw is screwed deeply into the outer screw, the distal end of the blunt needle of the connecting tool abuts or fits into the distal end of the cylindrical hollow body of the housing, and the inner screw is externally screwed. Since a gap is formed between the tip of the blunt needle and the tip of the cylindrical hollow body when screwed shallowly to
With the outer screw of the housing and the inner screw of the connector, the two can be easily connected and maintained, and by adjusting the degree of screwing of the outer screw and the inner screw, the tip of the blunt needle can be An easy-to-use liquid co-infusion device that can arbitrarily change the width of the gap formed between the distal end portion of the cylindrical hollow body and the mixing degree of the main chemical solution and other chemical solutions can be appropriately changed. be able to.

In the liquid co-injection device according to the present invention, the inner wall of the distal end of the cylindrical hollow body is formed so as to be tapered or the inner diameter increases toward the distal end. The outer wall is tapered or formed so that the outer diameter is reduced toward the tip, and the tip of the blunt needle is tightly fitted to the tip of the tubular hollow body. When the cylindrical hollow body is fitted into the distal end portion, the cylindrical hollow body is easily and reliably fitted by guiding each other, and especially when it is formed in a tapered shape, it is tightly fitted in a liquid-tight manner by its wedge action. The flow of the liquid into the lumen of the housing is blocked, so that the backflow to the branch pipe side can be prevented, and the side injection can be reliably administered to the patient's body.

Further, in the liquid co-injection device according to the present invention, an annular seal member made of an elastic material is provided on the inner wall of the distal end portion of the cylindrical hollow body and the outer wall of the distal end portion of the blunt needle is provided in close contact. The member can improve the liquid-tight seal between the distal end of the blunt needle and the distal end of the cylindrical hollow body, and has durability against repeated insertion of the distal end of the blunt needle into the distal end of the cylindrical hollow body. Can be maintained.

In the liquid co-infusion device according to the present invention, an annular locking portion is provided on the inner wall of the distal end portion of the cylindrical hollow body.
Since the outer wall of the tip of the blunt needle is made of an elastic material, an annular seal member is provided which comes into contact with the locking portion when the tip of the blunt needle is fitted into the tip of the hollow cylindrical body. It is possible to further improve the liquid-tight sealing between the portion and the tip of the cylindrical hollow body.

In the liquid co-injection device according to the present invention, since the lower surface of the rubber-like elastic body is formed in an arc-shaped cross section, the durability of repeated insertion of the blunt needle into the rubber-like elastic body is maintained, and the insertion resistance of the blunt needle is reduced. And the flow of the chemical solution can be made smooth.

Further, the liquid co-infusion device according to the present invention imparts antibacterial properties to the rubber-like elastic body, so that it is possible to reliably prevent bacteria from entering the infusion line.

In the liquid co-injection device according to the present invention, the width of the gap formed between the tip of the blunt needle and the lower surface of the rubber-like elastic body is set as follows.
Since it is within the range of 1 mm to 3 mm, it is possible to obtain a liquid co-injection device that does not hinder the deformation of the rubber-like elastic body when the blunt needle is inserted and does not form a dead space.

[Brief description of the drawings]

FIG. 1 is an external view, a cross-sectional view, and an AA cross-sectional view of the first embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of the first embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a main part of FIG. 2;

FIG. 4 is another operation explanatory view of the first embodiment of the present invention.

FIG. 5 is an enlarged sectional view of a main part of FIG. 4;

FIG. 6 is a diagram illustrating still another operation of the first embodiment of the present invention.

FIG. 7 is an external view and a cross-sectional view of a modified example of the connecting device according to the first embodiment of the present invention.

FIG. 8 is an external view and a cross-sectional view of another modification of the connector according to the first embodiment of the present invention.

FIG. 9 is an external view of a connector according to Embodiment 2 of the present invention.

FIG. 10 is an external view of a modification of the connector according to Embodiment 2 of the present invention.

FIG. 11 is an external view and a cross-sectional view of a third embodiment of the present invention.

FIG. 12 is an external view and a cross-sectional view of a fourth embodiment of the present invention.

FIG. 13 is an external view and a sectional view of a modified example of the housing according to Embodiment 4 of the present invention.

FIG. 14 is an external view, a cross-sectional view, and a BB cross-sectional view of the fifth embodiment of the present invention.

FIG. 15 is an operation explanatory view showing a cross section of a sixth embodiment of the present invention and an external view of a connecting tool therefor.

FIG. 16 is an external view of a seventh embodiment of the present invention and an explanatory diagram of its operation.

17 is an enlarged sectional view of a main part of FIG.

FIG. 18 is an external view showing a part of an eighth embodiment of the present invention in cross section, and an explanatory diagram of its operation.

FIG. 19 is an enlarged sectional view of a main part according to a ninth embodiment of the present invention.

FIG. 20 is an enlarged sectional view of a modification of the main part of the ninth embodiment of the present invention.

FIG. 21 is an enlarged sectional view of another modification of the main part of the ninth embodiment of the present invention.

FIG. 22 is a cross-sectional view of a conventional typical Y-type liquid co-injection device and its operation explanatory view.

FIG. 23 is an explanatory view of another operation of the conventional Y-type liquid co-infusion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1a Lumen 2 Mixed injection port 3 Outlet 4 Inlet 5 Branch pipe 6 Cylindrical hollow body 6a Tip part 6b Lumen 6c Communication hole 7,21,24 Rubber-like elastic body 7a, 21a, 24a Slit 7b, 21b, 24b Lower surface 8 Connection part 8a Projection part 9, 10, 17 Extension tube 11, 11A, 11B Connection tool 12 Hood part 12a Body part 13 Blunt needle 13a Lumen 13b Tip part 13c Side hole 14 Connection part 14a Lumen 15, 15A, 15B, 30, 30A Engagement part 15a, 15b, 30a Lock hole 15c, 30c Groove part 16 Injection cylinder 19 Male connector part 20 Female connector part 25 Outer screw 26 Inner screw 27 O-ring 28 Ring member 29 Ring locking part 30b Gap G1, G2, G3 Gap

Claims (15)

[Claims] 1. One end has a co-injection port to which a rubber-like elastic body having a slit formed substantially vertically at a center portion is attached, and an outflow port having an extension tube connected to a distal end portion is provided at the other end. A branch tube having an injection port at the distal end, which is branched at a substantially intermediate portion and coupled with an extension tube, and a tubular hollow body standing upright from near the base of the branch pipe to near the mixed injection port. A connection having a tubular housing provided in the lumen and a blunt needle pierced into a slit of the rubber-like elastic body, and detachably connected to the co-injection port side of the housing so as to be slidable and rotatable; When the connector is deeply connected to the housing, the tip of the blunt needle of the connector is fitted into the tip of the cylindrical hollow body of the housing, and the connector is made shallow. When connected, the tip of the blunt needle and the cylindrical The fluid mixture delivery instrument characterized in that as a gap is formed between the empty body of the tip portion. 2. A co-injection port to which a rubber-like elastic body having a slit formed substantially vertically in a center portion is attached at one end, and an outflow port having an extension tube connected to a tip end is provided at the other end. A branch pipe provided at a distal end thereof with an injection port branched at an almost intermediate portion and coupled with an extension tube, and is provided upright from near the base of the branch pipe to near the co-injection port, and a communication hole is formed in a side wall of the distal end. A hollow housing having a tubular hollow body having an inner cavity, and a blunt needle pierced into a slit of the rubber-like elastic body and having a side hole in a side wall at a distal end thereof, and detachably attached to a co-injection port side of the housing. And a connector connected to the housing so as to be slidable and rotatable. The connector is connected to the housing, and the tip of the blunt needle of the connector is attached to the tip of the cylindrical hollow body of the housing. And the connector is rotated in one direction. When the communication hole of the cylindrical hollow body and the side hole of the blunt needle face each other, the lumen of the housing communicates with the lumen of the cylindrical hollow body, and the connecting tool is rotated in the other direction. Wherein the side hole of the blunt needle is closed by a side wall of the distal end of the tubular hollow body when the liquid injection is performed. 3. The liquid co-infusion device according to claim 1, wherein the branch pipe is provided with its central axis eccentric to the central axis of the housing. 4. The connector according to claim 1, wherein an outlet portion of the housing is formed in a male luer-shaped male connector portion, and an injection port portion of the branch pipe is formed in a female luer-shaped female connector portion. The liquid co-infusion device according to any of the above. 5. The branch pipe is provided so as to be orthogonal to the housing, and the outlet side is bent from a substantially middle portion of the housing in a direction opposite to the branch pipe. 4. The liquid co-infusion device according to 4. 6. A lid-shaped cylindrical hood having an inner diameter substantially equal to the outer diameter of the outer wall of the co-injection port of the housing, wherein the outer wall portion is slidably and rotatably fitted. A blunt needle which is provided at a substantially central portion inside a top portion of the portion and which is pierced into a slit of the rubber-like elastic body when an outer wall of the co-injection port is fitted into the hood portion; A hood provided at a substantially central portion on the outer side and having a lumen communicating with the lumen of the blunt needle, comprising a connecting part to which a side injection part or a co-injection part is connected or coupled; Fitting the tip of the blunt needle into the tip of the tubular hollow body of the housing and forming a gap between the tip of the blunt needle and the tip of the tubular hollow body. A holding means for holding is provided. Liquid co-infusion device. 7. A plurality of locking means, wherein a holding means is provided on an outer wall of a co-injection port of the housing and a tip side of a body part of a hood part of the connection tool, and wherein the protrusions are locked. And a tip portion of the blunt needle of the connection tool when the protrusion is locked in any one of the locking holes of the engagement portion. The distal end of the blunt needle and the distal end of the tubular hollow body are fitted into the distal end of the hollow body and when the protrusion is locked in any one of the locking holes of the engaging portion. 7. The liquid co-infusion device according to claim 6, wherein a gap is formed between the liquid co-injection device and the portion. 8. A holding portion provided on an outer wall of a co-injection port of the housing, a groove portion provided on a tip end side of a body portion of a hood portion of the connecting tool, and the projection portion being fitted with the projection portion. When the protrusion is fitted in a groove of the engaging portion and is located in the groove. A gap is formed between the distal end of the blunt needle of the connector and the distal end of the cylindrical hollow body of the housing, and when the projection is locked in the locking hole of the engagement portion, While maintaining a state in which a gap is formed between the distal end of the blunt needle and the distal end of the tubular hollow body, the blunt needle when the protrusion is engaged with the engagement hole of the engagement portion 7. The liquid co-infusion device according to claim 6, wherein a distal end of the liquid co-infusion device is fitted into a distal end of the cylindrical hollow body. 9. The holding means comprises an external screw provided on an outer wall of a co-injection port of the housing, and an internal screw provided on an inner wall of a hood portion of the connecting tool and screwed with the external screw, When the inner screw is screwed deeply into the outer screw, the tip of the blunt needle of the connection tool abuts or fits into the tip of the cylindrical hollow body of the housing, and the inner screw is shallow with the outer screw. 7. The liquid co-infusion device according to claim 6, wherein a gap is formed between the distal end of the blunt needle and the distal end of the tubular hollow body when screwed. 10. An inner wall of a distal end portion of the cylindrical hollow body is formed so as to have a tapered shape or an inner diameter is increased toward the distal end, and an outer wall of a distal end portion of the blunt needle is formed into a tapered shape or a distal end. Formed so that the outer diameter is reduced toward
The liquid co-infusion device according to any one of claims 1 to 9, wherein a tip portion of the blunt needle is closely fitted to a tip portion of the tubular hollow body. 11. An annular seal member formed of an elastic material and provided on the inner wall of the distal end portion of the cylindrical hollow body and in close contact with the outer wall of the distal end portion of the blunt needle. The liquid co-infusion device according to any of the above. 12. A tubular hollow body provided with an annular locking portion on an inner wall at a distal end thereof, and a blunt needle formed of an elastic material on an outer wall at a distal end of the blunt needle. The liquid co-infusion device according to any one of claims 1 to 10, further comprising an annular seal member that comes into contact with the locking portion when fitted into the distal end portion. 13. The liquid co-infusion device according to claim 1, wherein the lower surface of the rubber-like elastic body is formed in an arc-shaped cross section. 14. The liquid co-infusion device according to claim 1, wherein an antibacterial property is imparted to the rubber-like elastic body. 15. The method according to claim 1, wherein the width of the gap formed between the tip of the blunt needle and the lower surface of the rubber-like elastic body is in the range of 1 mm to 3 mm. The liquid co-infusion device according to the above.