JP3521333B2 - Intravenous catheter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indwelling venous catheter, and more particularly to an indwelling venous catheter which is formed as an assembly product so that a catheter placed in a brachial vein can be placed and operated.

[0002]

2. Description of the Related Art Prior art similar to such an indwelling catheter is disclosed in the following documents and pamphlets. (1) Japanese Examined Patent Publication No. 4-74029 [Example of insertion and placement of a catheter by a peel-off cannula] A peel-off cannula having a linear discontinuity is used, and a metal puncture needle is pierced through the peel-off cannula. A catheter is introduced into the blood vessel via the catheter. This method peels off the cannula after the catheter is inserted.
Therefore, the cannula is not left after the catheter is placed, which is excellent in clean operation.

(2) JP-A-62-133969,
U. S. Patent-3,786,810, Subclavian Juggler Infuset [Catheter insertion device with slit] Puncture with a metal puncture needle, introduce the cannula into the blood vessel through this needle, and divide into the funnel part of this cannula. A possible attachment portion is connected, and the distal end of a sheath with a slit (linear crevice) containing a catheter is attached to the entrance of this attachment portion. When the tip of the catheter taken out from the slit of the sheath is pushed into the entrance of the attachment part, and the tip of the sheath is deflected to the side and pulled, the catheter is inserted into the blood vessel accordingly.
After inserting to the indwelling position, the attachment part is divided and removed, and only the catheter is left indwelling, so that the catheter can be inserted aseptically, the catheter can be easily delivered, and even a relatively soft catheter can be delivered. have.

(3) Central Parenteral Nutrition Catheter Set; Product Name: Elcas (Luther Medical Co., Ltd., Domestic Sales Hakko Co.) [Peel Away Introducer Needle] Since a peelable detachable metal injection needle is used for the needle. ,
Since the catheter can be inserted continuously from the puncture, the operation is easy and there is a feature that a so-called introducer needle does not remain. Moreover, since the catheter is stored in the polyethylene bag, there is an advantage that aseptic operation is possible.

[0005]

The conventional catheters for indwelling as described above have the following advantages, although they have the advantages of the configurations described briefly. First, the method disclosed in Japanese Patent Publication No. 4-74029 has a difficulty in operability and aseptic operability since the catheter is inserted after the metal needle is pulled out. Furthermore, the metal needle is pulled out. There was a problem that blood flowed back and leaked out. Next, those disclosed in Japanese Patent Application Laid-Open No. 62-133969 and others are mainly TTN (Through The Needl).
There are the following problems regarding the adoption of the method e). That is, if the catheter is pulled back during the insertion of the catheter, the inner surface corner of the SUS (stainless steel) needle may damage the catheter, the blood flow cannot be confirmed by flashback, and the inner diameter of the puncture needle The problem is that large diameter catheters cannot be used. Furthermore, with the "Central Parenteral Nutrition Catheter Set; product name: Elcas", as an inconvenient drawback, it is difficult to check the blood flow by flashback, and due to the TTN method, it is difficult to pull back the catheter when inserting the catheter, Moreover, it has been pointed out that a catheter having a diameter smaller than that of a puncture needle can be used.

The present invention has been made in order to solve the above-mentioned problems, and is mainly directed to a catheter introducing device capable of continuously and simply and aseptically operating from puncture to insertion / dwelling of a catheter. It is an object of the present invention to provide an intravenous indwelling catheter corresponding to the assembled product.

[0007]

The indwelling venous catheter according to the present invention has a straight lumen and an oblique side hole provided in the side wall on the proximal side.
DOO coalesce at a substantially central portion, the tip portion of the puncture needle inserted from the proximal opening of the straight bore is formed dimensioned to protrude from the distal end of the guide tube provided in the hand opening of the straight lumen peel off A peel-off device for a catheter comprising a cannula and a catheter sheath separating cover which has a sheath introduction port and a sheath pull-out port and is formed in a two-story tunnel shape so as to cover the oblique side hole of the peel-off cannula, and a linear tear in the length direction. And a catheter delivery device mainly composed of a slitted catheter sheath having a closed tip and a front end connected to a sheath adapter, and a catheter delivery device which is inserted into the slitted catheter sheath, the front end is opened and the front end is a lure. A catheter inserted into the inner tube of the adapter, and the distal end closing part of the catheter sheath with slit is a sheath In a state in which is inserted from the inlet and came out to sheath withdrawal opening, the outer portion of the oblique side holes with push open the slit catheter sheath from the distal end of the cleft, the catheter is separated from the catheter sheath tip oblique side hole It is formed as an assembled product in a state in which it is inserted into the entrance and prepared for catheter placement operation. It is practically preferable to provide a check valve near the entrance of the straight lumen on the proximal side of the peel-off cannula to prevent backflow of blood when the puncture needle is removed.

[0008]

In the present invention, the vein is in the state where the catheter delivery device using the slit sheath having the catheter housed inside is set in the side hole portion of the peel-off cannula having the side hole for inserting the catheter obliquely from the rear side. Since the indwelling catheter was formed as an assembled product,
After the guide tube is placed in the blood vessel by the puncture of the puncture needle, the operations from the removal of the puncture needle to the insertion / dwelling of the catheter can be performed continuously and aseptically. In particular, when the tip sealing part of the sheath with slit is pulled out from the side hole of the peel-off cannula, the catheter that was set with the tip slightly protruding into the side hole is Is advanced by being spread by the outer wall of the side hole, so that it can be smoothly inserted into the venous blood vessel through the guide tube with little contact with the outside air.

[0009]

1 and 2 are explanatory views showing an embodiment of an indwelling venous catheter according to the present invention. FIG. 1 is a perspective view showing the entire construction of an assembled product by disassembling the parts, and FIG. 2 is a peel-off cannula and a puncture needle. It is a detailed explanatory view showing a correlation with. In FIG. 2, the lower right diagram is a side view, the lower left diagram is a front view thereof, and the upper right diagram is a top view taken along the line AA of the lower right diagram.

In the figure, the assembly structure of the present indwelling catheter is roughly divided into a peel-off device for a catheter mainly composed of a peel-off cannula and a side hole, a catheter delivery device mainly composed of a slitted catheter sheath, and this slit. The catheter is inserted into the inner catheter sheath, the distal end is open, and the front end is a catheter attached to the inner tube of the luer adapter.

First, the peel-off cannula 1 has a brim 2
A SUS needle (puncture needle) that is inserted from the proximal opening of the straight lumen, with the cannula main body having a straight lumen and the straight lumen and the diagonal side hole provided in the side wall on the proximal side merge at approximately the center. ) 3 is formed so as to project from the tip of a guide tube (also referred to as an introducer) 4 provided outwardly at the tip of the straight lumen . The peel-off cannula 1 includes a cover 6 for separating the catheter sheath which covers the diagonal side hole 5 provided in the upper portion of the peel-off cannula 1 and has a sheath introduction port 6a and a sheath extraction port 6b which are formed in a two-story tunnel shape. SUS
The needle 3 is attached to a needle stock 7 that uses a locking bending plug 8 as an insertion plug,
The peel-off cannula 1 is inserted from the proximal side (collar 2 side) of the peel-off cannula 1, and the tip portion 3 thereof is prepared at the preparation stage of the indwelling operation.
The a is set so as to slightly project from the tip of the guide tube 4. A duckbill valve (check valve) 9 is attached near the entrance of the proximal lumen on the proximal side so that blood from the blood vessel does not flow backward when the SUS needle 3 is removed. When not in use, this portion is covered with a cylindrical cap (not shown) to protect it from dirt and bacteria. The guide tube 4 has an inner diameter slightly smaller than that of the outer diameter of the SUS needle 3 and is made of a thin resin tube having a length of, for example, about 25 mm.

Next, a catheter delivery device is used with the SUS needle 3 removed from the peel-off cannula 1. The catheter 13 inserted into the inner tube of the winged luer adapter 12 is inserted into the lumen of the slitted catheter sheath 10 whose one end is connected to the sheath adapter 11. Sheath adapter 11
The winged luer adapter 12 and the wing luer adapter 12 are male-female-coupled and integrated with the outer eye. The catheter 13 is slightly shorter than the length of the slit catheter sheath 10, and the tip of the slit catheter sheath 10 is sealed by a sheath tip melt 14 welded as seen in FIG. Since the catheter 13 is sufficiently smaller than the inner diameter of the slitted catheter sheath 10, it is accommodated in the inner diameter with a sufficient degree of freedom. A luer lock plug 15 is attached to the winged luer adapter 12 as a protective plug. In FIG. 1, the slitted catheter sheath 10 is shown separately from the distal end portion having the sheath distal end melt 14, but this is for the purpose of clearly showing the catheter 13 and is actually connected. Further, in the preparation stage for the indwelling operation, the sheath tip melt 14 is set in a state where the face is exposed at the position of the sheath withdrawal opening 6b . Further, in this state, a long cap (not shown) is covered on the hand side of the peel-off cannula 1, that is, the tip side including the SUS needle 3 and the guide tube 4, for ensuring safety.

The slit provided in the slit-containing catheter sheath 10 is a slit (not shown) formed by a single slit provided on the tube wall of the sheath along its entire length in the longitudinal direction.
Is. However, since the cracks are formed so as to maintain a tubular shape without opening the belly when slightly bent, it is possible to prevent bacteria and dust from entering the tube. Therefore, the overall configuration of the indwelling venous catheter has a major feature in that the catheter delivery device, the peel-off cannula and the catheter are integrated, and the entire system is a closed system to prevent contamination and aseptic operation as described above. I have.

The operation of the venous indwelling catheter configured as described above will be described. First, a venous indwelling catheter in the state of FIG. 2 (actually, the sheath distal end melt 14 of the slitted catheter sheath 10 is exposed at the sheath extraction port 6b) is punctured from the distal end portion 3a into, for example, a venous blood vessel and a guide tube. Insert most of the area of 4 (25 mm long). This structure is useful for the work of confirming by flashback whether or not the blood vessel is surely punctured. Then, while firmly fixing the peel-off cannula 1, the needle stock 7 is held and the SUS needle 3 is pulled out. At this time, the duckbill valve 9 acts so that the blood does not flow backward. Furthermore, the sheath tip melt 14 (FIG. 1) of the sheath withdrawal port 6b is pulled in the sheath withdrawing direction. By this operation, as shown in the lower left diagram of FIG. 2, the slitted catheter sheath 10 is pushed open by the outer side of the side hole portion forming the diagonal side hole 5 due to its progress, so that the diagonal side hole 5 The catheter 13 having its neck thrusted into the body naturally advances to the inner lumen of the guide tube 4 via the united portion of the inner lumen. In this way, as the outer catheter sheath 10 is pulled out, the inner catheter 13 also passes through the guide tube 4 in the catheter advancing direction shown in FIG. Is inserted.

Since the sheath adapter 11 has a slit formed in its lengthwise direction, it can be removed when the base of the sheathed catheter sheath 10 comes to the position of the sheath introduction port 6a. It is adapted to be removed from this system along with the catheter sheath 10. Also, the peel-off cannula 1 has a structure in which the entire peel-off cover 1 can be half-split in the vertical direction so that a gap can be seen in the ceiling of the peel-off cover 6, so if this is split into two parts and disassembled, Similarly, it can be easily removed from this system. Therefore, finally, the catheter 13 having the winged luer adapter 12
Only can be placed aseptically in a venous vessel.

As described in the above embodiments, the operations from puncture to catheter placement can be performed continuously, and the peel-off cannula and the catheter sheath separating cover are assembled with the catheter accommodated in the slit catheter sheath. Since the assembly product is formed as a closed system as a whole, a venous indwelling catheter can be obtained which can be aseptically and safely placed without directly touching the catheter upon placement. Further, since the guide tube (introducer) is made of plastic, even if it is pulled back, it is not scratched or scratched at the tip of the cannula as in the case of the TTN method, so that it can be pulled back smoothly when inserting the catheter. Compared with the conventional TTN method, even in the case of the same puncture needle size, a thicker catheter can be used correspondingly. Furthermore, since the catheter is inserted using the slitted catheter sheath, even a relatively soft catheter can be easily delivered.

[0017]

As described above, according to the present invention, a catheter delivery device comprising a sheath with slits for accommodating a catheter inside is set in a side hole portion of a peel-off cannula having a side hole into which a catheter is inserted obliquely from the rear. Since the venous indwelling catheter in the state is formed as an assembled product, it is possible to continuously and aseptically perform the operations from the removal of the puncture needle to the insertion and placement of the catheter after the guide tube is placed inside the blood vessel by the puncture of the puncture needle. Excellent effect can be obtained. In particular, when the tip sealing part of the sheath with slit is pulled out from the side hole part of the peel-off cannula,
The catheter, which was set with its tip slightly protruding into the side hole, advances as the slit sheath is pushed out by the outer wall of the side hole as the delivery of the sheath with slit progresses. It has the advantage of being inserted and placed in the Further, since the guide tube (introducer) is made of plastic, even if it is pulled back, the tip of the cannula is not damaged, so that it can be pulled back smoothly when the catheter is inserted. Further, as compared with the conventional TTN method, even in the case of the same puncture needle size, a thicker catheter can be used correspondingly. Further, since the catheter is inserted by using the slitted catheter sheath, it is possible to obtain an advantage that the catheter can be easily delivered even with a relatively soft catheter. In addition, in the initial operation, it is possible to easily confirm by flashback whether or not the puncture needle has punctured the blood vessel with certainty, and even if the SUS needle is pulled out after the puncture,
The check valve has an attendant effect such as preventing backflow of blood.

[Brief description of drawings]

FIG. 1 is a perspective view of the entire configuration of an assembled product showing an embodiment of an indwelling venous catheter according to the present invention in an exploded view.

FIG. 2 is a detailed explanatory view showing the correlation between the peel-off cannula and the puncture needle according to the present invention.

[Explanation of symbols]

1 peel-off cannula Two brims 3 SUS needle 3a tip 4 Guide tube (introducer) 5 diagonal side holes 6 Catheter sheath separation cover 6a Sheath introduction port 6b Sheath extraction port 7 needle stock 8 Bending plug 9 Duck bill valve (check valve) 10 Slitted catheter sheath 11 sheath adapter 12-wing lure adapter 13 catheters 14 sheath tip melt 15 Luer lock plug

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yosuke Okada 5 27-7 Sendagaya, Shibuya-ku, Tokyo 5th floor of Japan Brunswick Building, Japan Sherwood Co., Ltd. (56) Reference JP 62-133969 (JP, A) JP 62-254769 (JP, A) JP 2-13471 (JP, A) actual open 63-20856 (JP, U) actual open 62-97653 (JP, U) actual open 60 -180441 (JP, U) J. Kohei 4-74029 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) A61M 25/00-25/18

Claims (2)

(57) [Claims] 1. A straight lumen and an oblique side provided on a side wall on the proximal side
And the holes are combined in a substantially central portion, the tip portion of the puncture needle inserted from the proximal opening of the straight bore is formed dimensioned to protrude from the distal end of the guide tube provided in the hand opening of the straight lumen A peel-off cannula for a catheter, which comprises a peel-off cannula and a cover for separating the catheter sheath, which has a sheath introduction port and a sheath pull-out port and is formed in a two-story tunnel shape to cover the diagonal side hole of the peel-off cannula, and is linear in the entire length direction. A catheter delivery device mainly composed of a slitted catheter sheath having a split end and a closed tip and a front end connected to a sheath adapter, and a catheter sheath that is inserted into the slitted catheter sheath and the front end is opened. Has a catheter inserted into the inner tube of the luer adapter, and the distal end of the catheter sheath with slit is closed. In a state in which the portion is inserted from the sheath introduction port and the face is exposed to the sheath withdrawal port, the outer portion of the oblique side hole pushes the slitted catheter sheath open from the tip of the slit and is separated from the catheter sheath. The tip of the catheter is inserted into the diagonal side hole
A venous indwelling catheter, which is formed as an assembled product in a state in which it is inserted into the mouth and is ready for catheter indwelling operation. 2. A fluid at the time of removing the puncture needle near the entrance of the straight lumen on the proximal side of the peel-off cannula.
The indwelling catheter according to claim 1, further comprising a check valve for preventing backflow of the catheter.