JP3406281B2 - catheter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catheter or a combination of a catheter and a syringe, and in particular, in the case of non-dialysis during administration of infusion solution or injection, or during non-dialysis during dialysis therapy, etc. The present invention relates to an indwelling catheter or a combination of an indwelling catheter and a syringe which is effective when the needle portion is left in the blood vessel.

[0002]

2. Description of the Related Art When a catheter is left in a vein and intermittent administration of an infusion or injection is performed as necessary, blood flows into the catheter and coagulates during the night when no administration of the drug is performed. The inside of the catheter is heparinized to prevent the formation of blood clots. That is, the inside of the catheter is filled with a blood inflow / thrombosis preventing liquid, typically heparinized physiological saline (heparinizing), and heparin locking is performed. Heparin lock is also performed when a catheter is placed in a blood vessel and blood is collected over time, when blood pressure is intermittently measured, or when a catheter is placed in a blood vessel after completion of extracorporeal circulation in dialysis therapy.

During heparin locking, if the amount of heparinized physiological saline injected into the catheter is too much larger than the internal volume of the catheter, heparinized physiological saline enters the body,
The risk of bleeding may increase. On the other hand, if the amount is too small, the risk of blood flowing into the catheter and forming a thrombus increases. Therefore, it is necessary to inject an appropriate amount of heparinized physiological saline into the catheter.

However, the internal volumes of commercially available indwelling catheters and their combinations are not uniform, and at first glance it is not possible to know the proper amount of heparinized physiological saline to be injected. In particular, in the medical field, a plurality of constituent parts may be used as a catheter in combination, and since the time is rushed, there is a problem that the amount of heparinized saline injected into the catheter tends to vary. is there.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a catheter capable of reliably injecting an appropriate amount of liquid into the catheter. Another object of the present invention is to provide a combination of a catheter and a syringe that can reliably inject a proper amount of liquid into the catheter.

[0006]

The invention according to claim 1 is a catheter characterized in that an internal capacity display section for displaying the internal capacity is provided.

According to a second aspect of the present invention, in a catheter of a type having a three-way stopcock and a connection tube connected to the three-way stopcock, an internal capacity display section showing the respective internal capacities of the three-way stopcock and the connection tube. Are provided respectively.

According to a third aspect of the present invention, in a catheter having a three-way stopcock, an extension tube connected to the three-way stopcock, and a connection tube connected to the extension tube, the three-way stopcock and the extension tube are provided. The catheter is characterized in that each of the connection tubes is provided with an internal capacity display section for indicating the respective internal capacity.

According to a fourth aspect of the present invention, there is provided a combination of a catheter having an internal capacity display section and a syringe in which a liquid to be injected into the catheter is sealed, wherein the catheter is provided with the internal capacity display section. In addition, the syringe is provided with an internal capacity display unit that matches the internal capacity display unit of the catheter, and the combination of the catheter and the syringe.

According to a fifth aspect of the present invention, there is provided a combination of a catheter and a prefilled syringe in which an amount of liquid to be injected into the catheter is pre-filled, wherein the catheter is provided with an internal volume indicator, and It is a combination of a catheter and a prefilled syringe, characterized in that the prefilled syringe is provided with an internal volume display section that matches the internal volume display section of the catheter.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the present specification, a "catheter" has a needle portion to be inserted into a body cavity (blood vessel or the like), and constitutes a circuit for administering an infusion solution or an injection, a blood sampling or an external body. It means the part that constitutes the circuit that derives blood for circulation,
Specifically, it includes all of the following components. Needle part Needle part ＋ Connection tube ＋ Three-way stopcock Needle part ＋ Connection tube ＋ Extension tube ＋
The three-way stopcock needle portion and the connecting tube are usually integrally formed. The one that is further equipped with each component such as the three-way stopcock and the extension tube like the one not only is the one in which each component is originally integrated like the “central venous catheter”, but each component when used. Some are combined together. In the case of the latter combination, each component is independently sold as a product and used in an appropriate combination to meet various needs in a clinical setting.

An indwelling catheter according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an indwelling catheter 1 according to the first embodiment. This indwelling catheter 1
The needle portion 3, the connecting tube 5, and the three-way stopcock 7 are included. The needle portion 3 and the connecting tube 5 and the three-way stopcock 7 are sold separately and independently, and are assembled at the time of use.

The connecting portion 9 of the connecting tube 5 is provided with an internal capacity display portion M1 showing the internal capacity thereof as a numeral "2", and the connecting portion 11 of the three-way stopcock 7 is provided with an internal capacity indicating the internal capacity thereof. The display portion M1 is provided with a numeral "3". The internal capacity display portion M1 of the number "3" has an internal capacity of 3 m.
The internal capacity display portion M1 of L and the number "2" has an internal capacity of 2 m.
It is displayed that it is L. These internal capacity display units M
A plurality of 1's are arranged on the peripheral surfaces of the connecting parts 9, 11 so that they can be seen from any direction.

Therefore, the total volume of the indwelling catheter 1 which is the internal volume of the needle portion 3 and the connecting tube 5 is 2 mL and the internal volume of the three-way stopcock 7 is 3 mL, which is 5 mL.
You can see at a glance that it is. For convenience of understanding, the connecting tube 5 of the needle portion 3 is shown considerably thicker than it actually is. The same applies to the following figures.

At the clinical site, if heparinized physiological saline is measured using a syringe (not shown) with a volume scale based on the display of the internal volume display section M1, and this is injected into the indwelling catheter 1, it is appropriate. Heparin lock can be performed with an amount of heparinized saline.

FIG. 2 shows an indwelling catheter 13 according to the second embodiment. The indwelling catheter 13 has a needle portion 15
, A connection tube 17, an extension tube 19, and a three-way stopcock 21. The needle portion 15, the connection tube 17, the extension tube 19, and the three-way stopcock 21 are sold separately and are combined when used.

The connecting portion 18 of the connecting tube 17 is provided with an internal capacity display portion M2 showing its internal capacity.
The internal capacitance display portion M2 is composed of one linear mark provided on the outer peripheral surface of the connection portion 18. The connecting portion 23 of the extension tube 19 is also provided with an internal capacity display portion M2 indicating the internal capacity thereof. The internal capacitance display portion M2 is composed of one linear mark provided on the outer peripheral surface of the connection portion 23. Also, the three-way stopcock 21
The connection part 25 is also provided with an internal capacity display section M2 indicating the internal capacity thereof. The internal capacitance display portion M2 is composed of three linear marks provided on the outer peripheral surface of the connection portion 25.

One of the linear marks on the internal capacity display section M2 represents 1 mL. Therefore, in the internal capacity display section M2 of the connection section 18, the internal capacity of the connection tube 17 and the needle section 15 is 1 mL. To the internal capacity display portion M of the connection portion 23.
1 means that the internal capacity of the extension tube 19 is 1 mL, and further that the internal capacity display portion M2 of the connecting portion 25 means that the internal capacity of the three-way stopcock 21 is 3 mL. Therefore, the internal volume of the indwelling catheter 13 is equal to that of the needle portion 15.
It can be seen at a glance that the total volume of the connection tube 17 is 1 mL, the extension tube 19 is 1 mL, and the three-way stopcock 21 is 3 mL.

In a clinical setting, a syringe (not shown) having a volume scale is filled with an amount of heparinized physiological saline that matches the internal volume of the indwelling catheter 13, and the indwelling catheter 13 is filled with heparinized physiological saline. Is injected, an appropriate amount of heparinized physiological saline can be injected into the indwelling catheter 13 to perform heparin lock.

FIG. 3 shows an indwelling catheter 27 and an injection prefilled syringe 29 according to the third embodiment.
The indwelling catheter 27 includes a needle portion 31, a connecting tube 33, and a three-way stopcock 35 that are integrated.
The connecting portion 37 of the three-way stopcock 35 is provided with an internal capacity display portion M3 showing the internal capacity of the three-way stopcock 35 and the connecting tube 33. Further, the prefilled syringe 29 is also provided with an internal capacity display portion M3 that indicates the internal capacity thereof. The internal capacity display portion M3 is constituted by a star mark.

The prefilled syringe 29 is filled with heparinized physiological saline in an amount substantially matching the internal volume of the indwelling catheter 27. That is, in the prefilled syringe 29 in which the internal volume display portion M3 of the star mark is displayed, the amount of heparinized saline that substantially matches the internal volume of the indwelling catheter 27 in which the internal volume display portion M3 of the same star mark is provided. Is enclosed.

When the indwelling catheter 27 is heparin-locked in a clinical setting, the prefilled syringe 29 is selected by using the internal volume display portion M3 of the same star mark as a mark, and the total amount of heparinized physiological saline is supplied from the prefilled syringe 29. If it is injected into the indwelling catheter 27, heparin lock can be reliably performed in an appropriate amount.

Although the embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to this embodiment, and design changes and the like within a range not departing from the gist of the present invention. Even if it exists, it is included in the present invention. The display attached to the catheter is sufficient if the internal volume is known, and the display can be colored or patterned in addition to numbers and lines. The same applies to the prefilled syringe.

The internal volume may be indicated on the needle surface or the tube surface of the extension tube. In the third embodiment, a “no injection needle” (coupling with luer slip) syringe is used as the syringe, but a “with injection needle” syringe can also be used. In such a case, the portion to be the injection site has a plug-like shape such as a rubber stopper that can be punctured by an injection needle, or a three-way stopcock with a mixed injection (rubber) stopper capped.

[0025]

According to the catheter of the present invention and the combination of the catheter and the syringe, anyone can surely inject an appropriate amount of liquid into the catheter.

[Brief description of drawings]

FIG. 1 shows a perspective view of an indwelling catheter according to a first embodiment of the present invention.

FIG. 2 shows a perspective view of an indwelling catheter according to a second embodiment of the present invention.

FIG. 3 shows a perspective view of an indwelling catheter and a prefilled syringe according to a third embodiment of the present invention.

[Explanation of symbols]

1 Indwelling catheter 3 needles 5 connection tube 7 Three-way stopcock 13 Indwelling catheter 15 needles 17 Connection tube 19 Extension tube 21 Three-way stopcock 27 Indwelling catheter 29 Prefilled syringe for injection M1, M2, M3 Internal capacity display

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) A61M 25/00-25/18 A61M 1/14

Claims (5)

(57) [Claims] 1. A catheter comprising an internal volume display section for displaying an internal volume. 2. A catheter of a type having a three-way stopcock and a connection tube connected to the three-way stopcock, wherein each of the three-way stopcock and the connection tube is provided with an internal capacity display section for indicating an internal capacity thereof. A catheter characterized by being present. 3. A catheter of a type having a three-way stopcock, an extension tube connected to the three-way stopcock, and a connection tube connected to the extension tube, wherein each of the three-way stopcock, the extension tube, and the connection tube is provided. A catheter characterized by being provided with an internal capacity display section for indicating each internal capacity. 4. A combination of a catheter having an internal capacity display section and a syringe in which a liquid to be injected into the catheter is sealed, wherein the catheter is provided with an internal capacity display section. A combination of a catheter and a syringe, characterized in that an internal volume display section is provided which matches the internal volume display section of the catheter. 5. A combination of a catheter and a prefilled syringe in which an amount of liquid to be injected into the catheter is previously sealed, wherein the catheter is provided with an internal volume indicator, and the prefilled syringe is provided with the catheter. A combination of a catheter and a prefilled syringe, which is provided with an internal volume display section that matches the internal volume display section of.