JPS61226062A - Fluid injection cannula - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to an injector used for injecting fluid into the body, and particularly relates to an injector used for injecting fluid into the body, and particularly for use in an artificial heart-lung machine, an artificial kidney, an auxiliary artificial heart, etc. The present invention relates to an injection cannula for injecting body fluid, such as blood, into a biological flow path such as a femoral artery when the fluid is to be circulated extracorporeally.

(Prior Art) For example, FIG. 5 schematically shows a case where the blood of a living body is circulated extracorporeally using an artificial heart-lung machine. A blood feeding (blood infusion) cannula 4 is inserted into the femoral artery 2r, a blood removal cannula 5 is inserted into the femoral vein 3f, blood is removed from the femoral vein 3f with the cannula 5, and the blood is guided to the heart-lung machine 6. This blood is treated with the heart-lung machine 6, and the treated blood is passed through the cannula 4 into the femoral artery 2f.
send to.

(Problems to be Solved by the Invention) However, the cannula used in the past generally has a small diameter, which increases the resistance of the cannula and makes it impossible to sufficiently increase the pressure (blood pressure) in the artery. For this reason, sufficient blood could not be sent to the carotid artery or other organs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fluid injection cannula such as a blood delivery cannula that can sufficiently raise the blood pressure in an artery.

[Structure of the invention]

(Means for Solving the Problems) In the present invention, one open end of a flexible membrane having a diameter larger than that of the pipe is fixed to the tip of a pipe for fluid injection,
An insertion end member is integrated with the other open end of the flexible membrane, one end of a flexible core member is coupled to the insertion end, and the flexible core member is passed through the flexible membrane. A fluid injection cannula extending into the pipe and having a fluid communication port formed in at least one of the insertion end member and the flexible membrane body and communicating with the inner space of the pipe through the inner space of the flexible membrane body; It includes a flexible membrane member having a larger diameter than the flexible membrane body, and a driving means for changing the diameter of the flexible membrane member.

(Function) According to this, in the fluid injection cannula, if the diameter of the flexible membrane member is increased, blood flow can be stagnated by the flexible membrane member.

Moreover, if the diameter of the flexible membrane member is made small, blood flow can be made smoother. Therefore, by adjusting the diameter of the flexible membrane member, the pressure of blood flow, ie, blood pressure, can be adjusted.

(Example) FIG. 1 shows an example of the present invention. Note that this example is a cannula for arterial blood supply, and a partial cross section is shown.

A connector 15 for connecting a fluid pipe of a device such as a heart-lung machine is fixed to one end of the blood feeding pipe 11. One end of a flexible tube 12, which is a flexible membrane, is fixed to the other end of the blood feeding pipe 11. An insertion end member 14 is fixed to the other end of the flexible tube 12. These blood supply pipes】1. The flexible tube 12 and the insertion end member 14 are made of vinyl chloride resin coated with an antithrombotic material or a polyurethane antithrombotic material.

One end of the core member 13 is fixed to the insertion end member 14,
The other end G is fixed to the coocter 15 via the inner space of the flexible tube 12 and the blood feeding pipe 11.

The core member 13 is also made of vinyl chloride resin coated with an antithrombotic material or a polyurethane antithrombotic material.

The connector 15 includes a boat 16 that receives blood flow and a core member 1.
3 is fixed to a boat 17, and is approximately Y-shaped.

The core member 18 passes through the core member 13, one end passes through the insertion end member 14 and projects to the outside, and the other end extends through the connector 1.
It penetrates the boat 17 of No. 5 and protrudes to the outside.

The tip of the flexible tube 12, that is, the insertion end member 1
A plurality of fluid communication openings 19 are provided in the vicinity of the fixed portion with 4. One end of a flexible umbrella member 20, which is a flexible membrane member or cylindrical member, is fixed to the back of the fluid communication opening 19. A wire 21 is fixed to the other end of the flexible umbrella member 20, and the wire 21 is fixed to the tip 22 of the core member 18.

Further, the other end of the core member 18 is disposed to loosely pass through the operator 23. Therefore, the operator 23 can rotate independently with respect to the core member 18. This operator 23 and connector 1
A threaded groove 24 is formed between the boat 17 and the boat 17.

Therefore, when the operator 23 is rotated, the operator 23 moves forward and backward relative to the connector 15. The core material 18 is the operator 2
Move forward and backward according to step 3, forward and backward. When the core material 18 moves forward, the tip 22 moves forward while pulling the wire 21, and the entire flexible +A' 20 is closed.

Conversely, if the core member 18 moves backward, the tip 22 moves back while returning the wire 21, and the flexible umbrella member 20 is opened.

Therefore, according to this embodiment, after the flexible tube 12 is inserted into the artery with the flexible umbrella member 20 closed by rotating the operator 23, the flexible umbrella member 20 is opened by rotating the operator 23 appropriately. open. Thereby, the blood flow can be arbitrarily stagnated near the fluid flow opening 19, and the blood pressure can be maintained.

Next, FIG. 2 shows another embodiment of the present invention. This example is also a 111M blood-transfer cannula and is partially shown in cross section.

In this example, a bag-shaped tube with a variable diameter is arranged at the rear of the flexible tube 32.

A detailed explanation will be given with reference to the drawings. A connector 35 is fixed to one end of the blood feeding pipe 11 as in the first embodiment. One end of a flexible tube 32, which is a flexible membrane, is fixed to the other end of the blood feeding pipe 11. An insertion end member 14 is provided at the other end of the flexible tube 32.
is fixed. These blood supply pipes 11. The flexible tube 32 and the insertion end member 14 are made of vinyl chloride resin coated with an antithrombotic material or polyurethane antithrombotic material, as in the first embodiment.

One end of the core member 33 is fixed to the insertion end member 14,
The other end is a flexible tube 32 and a blood feeding pipe 1
The connector 35 extends through the inner space of the connector 35 . This core member 13 is made of stainless steel. The connector 35 has a boat 36 for receiving blood flow and a boat 37 for attaching the core member 33, and is approximately Y-shaped. The connector-side end of the core member 33 passes through the boat 37 of the connector 35 and protrudes to the outside, and the rotary operator 41 is fixed to the protrusion.

The tip of the flexible tube 32, that is, the insertion end member 1
A plurality of fluid communication openings 19 are provided in the vicinity of the fixed portion with 4. A plurality of fluid communication openings 40 are further provided in the intermediate portion of the flexible tube 32 . One open end of a flexible bag member 50, which is a flexible membrane member, is fixed to the rear portion of the fluid communication opening 40. The other open end of the flexible bag member 50 extends to the connector 35 so as to cover the blood feeding pipe J1. The connector 35 has a double structure so that the open end of the pipe 11 and the other open end of the flexible bag member 50 are fixed to each other. The open end of the pipe 11 is connected to the inner step 3 of the connector 35.
8 and is connected to the boat 36. The other open end of the flexible bag member 50 is fitted into the large-diameter stepped portion 39 of the connector 35 and communicates with the boat 41.

When fluid is injected from the boat 41, the flexible bag member 50 expands, and conversely, when the fluid is discharged, the flexible bag member 50 contracts.

An example of the use of this embodiment is shown in FIGS. 3 and 4. Fourth
The figure shows the cannula 30 of this embodiment inserted into the aorta 2. In this state, the flexible bag member 50 is contracted, blood flowing out from the fluid communication opening 19 of the flexible tube 32 of the cannula 30 flows into the carotid artery, and blood flowing out from the fluid communication opening 40 flows into the organ and the femoral artery. Blood is sent to In this state, blood pressure tends to drop because the blood is dispersed to various parts. FIG. 4 shows a state in which fluid is injected into the flexible bag member 50 to inflate it. In this state, the flexible bag member 50 expands to block blood flow to the femoral artery, thereby increasing blood pressure in the aorta and increasing the amount of blood sent to the carotid artery or organ. At this time, by adjusting the inflation period of the flexible bag member 50, the amount of blood sent can be adjusted.

In addition, is this flexible bag part +4'50? Injection and evacuation of the body can be carried out, for example, by connecting a syringe to the boat 41 and adjusting the cylinder of the syringe.

In addition, in the second embodiment, when the rotary operator 42 is rotated with the connector 35 fixed, the core member 33 is twisted, thereby the end member 14 is rotated, and the flexible tube 12 and the flexible bag member 50 are rotated. "Koyori"
twisted into a shape. After inserting into the artery in this state, by rotating the operator 42 in the opposite direction, the flexible tube 12 and the flexible bag member 5o are loosened and easily inflated, and can be inflated when blood flow is applied. . Therefore, in this example, since the diameter of the cannula can be reduced by twisting, the cannula can be percutaneously inserted into a fluid path such as the aorta.

〔Effect of the invention〕

As described above, in the fluid injection cuff 4-re of the present invention, by increasing the diameter of the flexible membrane member, blood flow can be stagnated by the flexible membrane member. In addition, if the diameter of the flexible portion (A) is made small, +ra?!li can be made smooth. Therefore, by adjusting the diameter of the flexible membrane member, the pressure of blood flow, That is, blood pressure can be adjusted.

Figure 1 in Figure 1 is a side view including a partial sectional view showing one embodiment of the present invention, and Figure 2 is a side view showing another embodiment of the present invention. 3 and 4 are explanatory diagrams showing the state of use of the embodiment shown in the second panel, and FIG. 5 is a side view including a partial sectional view, and FIG. FIG. 2 is an explanatory diagram showing an outline of an extracorporeal circulatory system in combination with a blood vessel.

1...heart, 2...aorta, 2r...femoral artery,
3... Caval vein, 3f... Femoral vein, 4... Blood supply,
cannula for use, 5... cannula for blood removal, 6... heart-lung machine, 10.30... cannula for fluid injection, 11
... Pipe, 12°32 ... Flexible tube (flexible membrane body), 13.33 ... Flexible core member, 14
... Insertion end member, 15.35 ... Connector, 16.36 ... Blood supply boat, 18 ... Core material (driving means), 19, 4.0 ... Fluid circulation opening, 20 ...
Flexible umbrella member (flexible membrane member, cylindrical member), 21
...Wire (driving means), 23... Operator (driving means), 41... Boat (driving means), 50... Flexible bag member (flexible membrane member)

Claims (5)

[Claims] (1) A pipe for fluid injection, a flexible membrane body having one open end fixed to the tip of the pipe and having a larger diameter than the pipe, and integrated with the other open end of the flexible membrane body. an insertion end member;
a flexible core member having one end coupled to the insertion end member and extending to the pipe through the flexible membrane; a flexible core member formed on at least one of the insertion end member and the flexible membrane; a fluid communication opening that communicates with the inner space of the pipe through the inner space of the pipe, a flexible membrane member having a larger diameter than the flexible membrane body, and a diameter of the flexible membrane member being changed. A fluid injection cannula comprising a drive means for causing the fluid injection. (2) The flexible membrane member is a cylindrical member whose one open end is fixed near the insertion end member of the flexible membrane, and the driving means is a cylindrical member that is fixed to the insertion end member of the flexible membrane body. The cannula for fluid injection according to claim 1, comprising a wire fixed to an open end, and a core material of the flexible core member having one end connected to the wire. (3) The insertion end member is fixed to one end of the flexible core member, one end of the core member is made to protrude from the insertion end member, and the other end of the flexible core member is fixed to the inner space of the pipe. 3. The fluid injection cannula according to claim 2, wherein the cannula penetrates through the core material and projects to the outside of the pipe, and has an operator fixed to the other end of the core material. (4) The flexible membrane member has one open end fixed to the flexible membrane body, and the other open end is a bag member that covers the pipe, and the driving means is configured to move a fluid to the bag member. The fluid injection cannula according to claim 1, which injects and discharges fluid. (5) The fluid injection cannula according to claim 4, wherein the flexible membrane has a fluid passageway near the insertion end member and near the intermediate portion.