JPS63252170A - Body embedding type catheter equipped with reservoir - 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 (1) Industrial fields of application This invention is applicable to continuous administration of insulin to patients with advanced chronic diabetes, continuous high-concentration local intensive administration of anti-cancer drugs to patients with terminal cancer, and treatment of terminal cancer. The present invention relates to an implantable catheter with a reservoir that is used for injecting medicinal solutions such as narcotic injections for pain treatment to patients.

(2) Prior Art A conventional catheter with a reservoir implanted in the body used for the various purposes mentioned above is constructed as shown in FIG. 4. 101 is a catheter, 1
02.103 is a catheter tube connected via a connector 104, 105 is an elastically deformable serper for storing drug solutions, and the needle receiver disposed on the bottom part 106 is a catheter tube connected through a connector 104.
7 and a dome-shaped needle insertion part 108, the tube 103
The tube 103 is connected to the proximal end of the tube 103 .

Such a catheter 101 is buried in a patient's body with the distal end opening of the tube 102 positioned at the site to be treated. After implantation, the reservoir 10 of the catheter 101
Various drug solutions are injected into the tube 1 through injection needles inserted into the needle insertion part 107, and by pressing the needle insertion part 108 of the reservoir from the outside, the injected medicine solution is
03.102 and flows from the distal opening of the tube 102 to the treatment site.

(3) Problems to be Solved by the Invention Incidentally, the catheter 101 may be subject to unavoidable strong external pressure on the reservoir 105 inside the patient's body, such as when the door hits the patient when opening or closing, or If strong pressure is suddenly applied to the reservoir 105 due to the patient's carelessness, the drug solution in the reservoir 105 will flow into the treatment area all at once.
There are problems in that expensive medical solutions are wasted, and some medical solutions can cause paralysis such as respiratory failure in patients, leading to death.

Therefore, in order to eliminate the problems associated with the conventional catheter, the present invention provides a technology that prevents the liquid medicine in the reservoir from flowing all at once to the treatment area even when strong pressure is applied to the reservoir. This will be a major issue.

(4) Means for Solving the Problems In order to achieve the above-mentioned technical problems, the catheter of the present invention is provided in a catheter tube and has a reservoir (first reservoir) on the opposite side to the insertion side into the treatment site. An elastically deformable second reservoir for accommodating a medical solution flowing from the first reservoir is provided in the catheter tube in communication with the tube in a sealed manner, and the catheter tube is connected between the second reservoir and the first reservoir from the first reservoir. The present invention is characterized in that it is provided with a check valve that is opened by the flowing medical fluid, and that this check valve is provided with an orifice that communicates with the inside of the catheter tube before and after the back-up valve.

(5) Effect By adopting the technical means described above, it is possible to store the medicinal solution in the first reservoir in the second reservoir, and store the medicinal solution in the first reservoir only during injection. becomes. If strong pressure is applied to the second reservoir from the outside while the chemical solution is stored in the second reservoir,
The chemical liquid in the second reservoir is prevented from flowing toward the first reservoir by the check valve, and gradually flows toward the first reservoir through an orifice provided in the check valve. In this way, the medical solution is prevented from flowing all at once into the treatment area.

(6) Embodiment In FIG. 1, reference numeral 1 denotes a catheter, which includes catheter tubes 2, 3, 4.5 of a predetermined length made of silicone rubber with little bioabnormality.
are removably connected in series through Teflon hollow connectors 6, 6' and 6''. Except for this tube, it is formed to have a smaller diameter than the other tubes 3 and 4.5.

One end of the tube 2 is opened so that a guide wire (not shown) used when embedding the catheter 1 in the body can pass therethrough, and a small hole 7 is bored in the outer periphery of the one end. An on-off valve 8 for opening and closing the flow path 9 within the tube 3 is provided at a longitudinally intermediate portion of the tube 3 . The on-off valve 8 has a convex portion 10 provided on the inner surface of the tube 3 with a thickness approximately equal to the cross section of the flow path, and a convex portion 10 provided on the inner surface of the tube 3 at a position opposite to the convex portion 10.
The recess 11 is integrally provided to protrude from the outer surface of the recess 11 and fits tightly into the protrusion 10 when the flow path 9 is closed. The convex portion 10 is provided with an engagement recess 13 with a narrow opening edge,
Further, in the recess 11, an engagement protrusion 15 that elastically engages with the engagement recess 13 to maintain the close contact between the recess 11 and the protrusion 10 when the protrusion 11 is fitted into the protrusion 10 is disengaged. It is set up so that it is possible.

An elastically deformable reservoir 16 for storing a drug solution and an elastically deformable pump 17 that also functions as a reservoir are provided in the longitudinally intermediate portion of the tube 4 in communication with the tube 4 . The reservoir 16 and the pump 17 have a common needle holder made of a stainless steel plate that prevents the injection needle from penetrating the bottom 19, and a syringe needle can be inserted into the side opposite to the part 18 of the needle holder. In addition, when the punctured injection needle is removed, the dome-shaped needle insertion part 20.21 has good self-closing properties, and the hole formed by the puncture is naturally closed.
have. A check valve 25 is provided at the joint between the reservoir 16 and the pump 17 to allow the chemical liquid in the server 16 to flow toward the pump 17, but to prevent the chemical liquid in the pump 17 from flowing toward the reservoir 16.

An elastically deformable balloon-shaped glue reservoir 27, which is inflated by the chemical liquid flowing from the reservoir 16, is connected to the proximal end of the tube 5, which does not fit into the connector 6, in communication with the tube in a sealed manner. A check valve 28 is provided at the proximal end of the tube 5 covered by the reservoir 27, which allows the liquid medicine in the server 16 to flow into the reservoir 27, but prevents the liquid medicine in the reservoir 27 from flowing towards the reservoir 16.

As shown in Fig. 2, the check valve 28 is made up of two silicone rubber sheets 30, 31 stacked one on top of the other, one side edge of which is glued, and the tip of the sheet 30, 31 is flat. The tip edge of the crushed portion is not bonded and is formed into a slit 33. Further, an orifice 35 is bored in the inclined portion of the sheet 30 that is not flattened, and the reservoir 27 is connected to the orifice 35 from the orifice 35.
The chemical solution inside can flow to the reservoir 16 side.

The catheter 1 configured as described above is inserted into the body from one end of the tube 2, and the reservoir 16 and the bottom 19 of the pump 17 are inserted into the fascia with the entrance part of the one end of the tube 2 positioned at the area to be treated. By sewing and fixing, it is embedded in the body including the reservoir 27.

Reservoir 16 in catheter 1 buried in the body
A 25-27G injection needle is inserted into the needle insertion part 2 as needed.
By puncturing the 0, medical solutions such as insulin and anti-cancer drugs are injected. The chemical solution injected into the reservoir 16 passes through the tube 5 and flows to the reservoir 27 side, and from the opposite check valve 25 to the pump 17 side.

In the former case, after passing through the tube 5, it flows into the reservoir 27 through the slit 33 of the check valve 28 and is stored therein.

As the storage amount increases, the reservoir 27 expands.
In the latter case, after entering the pump 17, the tube 3
, 2, and flows from the opening at one end of the tube 2 and the small hole 7 to the area to be treated, and if necessary, by pressing the ribbon button 17, it flows along the same route. To prevent the medicinal solution injected into the reservoir 16 from flowing from the opening at one end of the tube 2 and the small hole 7, operate the on-off valve 8 in advance to press the recess 11 and fit it tightly into the protrusion 10. , close the channel 9 of the tube 3. When the flow path 9 is closed, the engagement protrusion 15 of the recess 11 elastically engages the engagement recess 13 of the protrusion 10, and when engaged, the recess 11 and the protrusion 10 are not disengaged from each other. , close contact is maintained.

To open the flow path 9 of the tube 3 again, press the end of the tube 3 on the connector 6 side with your finger and press the pump 17 to increase the pressure inside the tube 3 due to the suppression of the pump 17. By doing so, the engagement protrusion 15 is disengaged from the engagement recess 13, and the recess 11 is unfitted to the protrusion 10.

On the other hand, a predetermined amount of the chemical liquid stored in the reservoir 27 is
By pressing on the reservoir 27, the reservoir 1 is passed from the orifice 35 of the check valve 28 through the tube 5°4.
The water flows from the check valve 25 to the pump 17 side as described above. This outflow of the medicinal solution from the reservoir 27 occurs not only based on the patient's will but also due to the patient's inadvertence applying strong pressure to the reservoir 27 from the outside. Since this is possible only from the beginning, the medicinal solution in the reservoir 27 will not flow all at once toward the reservoir 16 and into the treatment area.

FIG. 3 shows a modification of the tube 2 of the catheter 1. This tube 42 has a slightly larger diameter than the tube 2 described above, and one end of the tube 42 is closed in a substantially hemispherical shape. A radial cut 43 is provided that opens when the guide wire passes therethrough, and a slit-shaped check valve 45 that opens by the internal pressure of the tube 42 is provided on the outer periphery near one end.

It should be noted that the above-mentioned embodiment merely shows a preferred example, and it goes without saying that the detailed design can be changed in various ways without changing the gist.

(7) Effects of the invention This invention has the above-mentioned configuration, and has a second reserve.
When strong pressure is applied from outside, the check valve can prevent the chemical solution in the second reservoir from flowing to the first reservoir, and it also flows little by little into the first reservoir through the orifice provided in the check valve. This makes it possible to reliably prevent patients from suffering paralysis such as respiratory failure, which occurs with conventional catheters when liquid medicine flows all at once to the treatment area, and permanently maintains the safety of patients in their daily lives. In addition to being able to do this, it also has many other advantages, such as eliminating the need for wasteful consumption of expensive chemical solutions.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted longitudinal sectional front view of a catheter tube showing an embodiment of the present invention, FIG. 2 is a partially enlarged perspective view of the main part, and FIG. 3 is a modified example of one end of the catheter tube. FIG. 4 is a longitudinal sectional front view of a catheter tube showing a conventional example. 1... Catheter 2.3, 4.5... Catheter tube 6.6', 6
'... Connector 8... On-off valve 9... Channel 10... Convex portion 11... Concave portion
13... Engagement recess 15... Engagement protrusion 16... Reservoir (first reservoir) 17... Pump 18... Needle guard is part 20.21.
... Needle insertion part 25, 28 ... Check valve 27
... Reservoir (second reservoir) 35... Orifice; i4[! l! ]

Claims (1)

[Claims] 1. In a catheter with an implantable reservoir, in which a catheter tube is provided with an elastically deformable first reservoir for storing a drug solution in communication with the tube, the catheter tube has an elastically deformable first reservoir that is connected to the catheter tube, and the catheter tube has an elastically deformable first reservoir that communicates with the tube. An elastically deformable second reservoir that stores a medical solution flowing from the first reservoir into the catheter tube is provided in a sealed manner in communication with the tube, and the first reservoir is connected to the catheter tube between the second reservoir and the first reservoir. 1. A catheter with a reservoir to be implanted in the body, characterized in that a check valve is provided that is opened by a medicinal solution flowing from the inversion valve, and the check valve is provided with an orifice that communicates with the inside of the catheter tube before and after the inversion valve.