JPS6121106B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Background of the Invention Technical Field The present invention is used for an intravascular indwelling catheter and can be easily inserted into the catheter.
The present invention also relates to an improvement in an obturator that blocks the inside of a catheter in order to prevent blood coagulation inside the catheter and secure a flow path inside the catheter.

Prior art Traditionally, when administering blood transfusions or infusions to a patient, it is done by puncturing a blood vessel with a metal needle. It is not advisable to keep it in place. This is especially dangerous if the patient is a child or an unconscious person, as there is a risk of damaging the patient's blood vessel wall. Therefore, instead of metal needles, plastic tubes are used that can withstand long-term indwelling and do not damage blood vessel walls. However, if a plastic tube is left in a blood vessel during intermittent blood transfusions, infusions, or when blood transfusions or infusions are interrupted, blood may enter the plastic tube, coagulate, and block the plastic tube. I end up. For this reason, anticoagulants such as heparin are injected into the catheter tube to prevent blood from coagulating inside the plastic tube, or an obturator made only of metal or plastic is inserted into the plastic tube.
Measures are taken to prevent blood from flowing into the plastic tube.

Problems with the Prior Art However, the method of injecting an anticoagulant into a plastic tube is cumbersome to operate, and it may not be desirable to inject the anticoagulant. In other words, an adapter or a rubber adapter is attached to one end of the plastic tube, and an anticoagulant is injected through the rubber with a syringe to remove the blood inside the plastic tube and prevent blood clotting. In some cases, it is necessary to cover the adapter with a cap to prevent it from leaking after the anticoagulant is injected. When a rubber adapter is attached, if the rubber does not have a good seal, there is a risk that fluid may leak from the injection needle. or,
The use of heparin is not preferable for intermittent blood sugar level measurements, etc., as it may lead to errors. Furthermore, conventional obturators are undesirable because their plugging portions are made only of metal such as stainless steel or plastic resin such as polypropylene or polyethylene.

That is, when the embolus part is made only of metal, it is hard and tends to have a sharp tip, which is dangerous because it may injure the blood vessel. If the length of the embolus is determined so that the tip of the embolus does not protrude from the catheter, there is a possibility that blood coagulation may occur at the distal end of the catheter.
Additionally, the surface of metal is rough and blood coagulation is likely to occur.

When the embolus part is made only of plastic resin, if the embolus part is thin, it loses its elasticity and bends easily, resulting in poor operability. Further, if the diameter of the plugging portion is large, it is not useful because the size tends to vary during manufacturing. Furthermore, recently, threads impregnated with elastic resin have been considered, but the impregnation process is cumbersome and it is difficult to smooth the surface of the plugged area. is very difficult to make.

Purpose of the Invention The present invention has been made in view of the above circumstances, and the present invention provides an object for an intravascular indwelling catheter for occluding a flow path in the catheter of an intravascular indwelling catheter consisting of a catheter and a catheter hub. The titulator includes a plug member whose metal core material is coated with resin, has an outer diameter approximately the same as the inner diameter of the catheter, and has a rounded tip, and a proximal end of the plug member. The object of the present invention is to provide an obturator for an intravascular indwelling catheter, which comprises the fixed catheter hub and a hub that engages with the catheter hub.

Further, the hub includes a main attachment portion having an outer wall surface that engages with an inner wall surface of the catheter hub, and extends from a rear end of the main attachment portion toward the distal end of the plug member,
It is preferable that the catheter hub includes a cylindrical auxiliary attachment portion having a screw thread on the inner circumferential wall that engages with a threaded protrusion provided on the outer wall of the catheter hub.

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the obturator for an intravascular indwelling catheter according to the present invention will be described based on the drawings.

In Figure 1, the obturator consists of an obturation part and a hub, and the obturator part 1 has a length of 67 mm and an outer diameter.
A 73 mm metal core material 2 is covered with a plastic material 3 made of thermoplastic resin such as FEP (fluorinated, ethylene proprene, copolymer). The wall thickness of the plastic material is approximately 0.2 mm.
The material of the core material 2 is made of metal such as stainless steel or piano wire, and is preferably hard enough to hold the core material in a straight line when held. The tip 4 of the plugging part 1 is the core material 2
The tip is machined so that the tip is covered with the plastic material. The tip of this embolization part is formed to match the shape of the tip of the catheter as shown in Figure 2, and the tip is shaped so that it is rounded so that it slightly protrudes from the tip of the catheter. That's good. Further, it is preferable to provide a locking part 6 at the base of the plugging part 1, or to provide a flange part 5 as shown in FIG. 3, in order to strengthen the connection between the hub and the plugging part.

The hub 7 is made of thermoplastic resin such as polypropylene, and has a main attachment part 9 and an auxiliary attachment part 10 that are integrally molded. There is a passage 1 inside the main mounting part 9.
2 is formed, and the distal opening 8 of this passage 12 is large enough to allow insertion of the obturator 1, and the diameters of the middle and rear ends of the passage are larger than the opening 8. The external shape of the main attachment part is tapered at one end to fit, for example, a Luer connector. The auxiliary attachment part 10 is cylindrical and is provided concentrically around the outer circumference of the main attachment part 9, and has a screw thread on the inner circumferential surface of the auxiliary attachment part to ensure a tight fit with the threaded protrusion of the Luer connector. are integrally formed.

It is preferable to form a knurl on the outer peripheral surface of the auxiliary attachment part 10 in order to ensure secure retention.

The obturator part 1 and the hub 7 are glued together in a passageway 12 in the main attachment part. That is, the distal end of the plugging part 1 is inserted through the rear end opening of the hub 7, and the locking part 6
After the hub 7 and the plugging part 1 are locked at the stepped part 11, the hub 7 and the plugging part 1 are bonded together with a hardening resin such as polyurethane or epoxy.

The adhesive member 13 is filled so as to fill the passage 12 of the main attachment part. The outer diameter of the embolus portion 1 is set to be approximately the same as the inner diameter of the desired intravascular indwelling catheter. Further, the length of the obturator part is set so that when the obturator is inserted into the catheter, it will protrude slightly from the same position as the desired tip of the catheter.

Incidentally, in order to reduce the frictional resistance between the inner surface of the catheter and the outer surface of the embolus part 1, it is preferable to apply a silicone coat to the outer surface of the embolus part.

Specific Effects of the Invention A case will be described in which blood is sampled intermittently using the obturator for an intravascular indwelling catheter of the present invention as an indwelling needle. As shown in FIG. 4, the indwelling needle includes a catheter 15 having a catheter hub 14 at its proximal end, and is inscribed in the catheter 15.
An inner needle hub 16 is provided at the proximal end, and the catheter includes a puncture needle 17 that can be inserted into the catheter. First, an indwelling needle is inserted into the patient's blood vessel, and once the blood vessel is secured, the inner needle hub 16 is fixed, and only the catheter 15 is advanced to the required depth. Then, the catheter hub 14 is fixed with a finger and the puncture needle 17 is pulled out. Thereafter, the obturator for an intravascular indwelling catheter of the present invention is inserted into the catheter. The obturator of the present invention has a metal core coated with thermoplastic resin, so it has stiffness and can be easily inserted into a catheter.
After inserting the obturation part 1 into the catheter until the catheter hub 14 contacts the auxiliary attachment part 10 of the hub 7, the hub 7 is rotated and the threaded protrusion 18 of the catheter hub is provided on the inner peripheral surface of the auxiliary attachment part. Screw together with the screw threads. When completely screwed together, is the tip of the embolus part 1 in the same position as the tip of the catheter 15?
It really stands out.

When sampling blood, the hub 7 is rotated to unthread the screw thread provided on the inner peripheral surface of the auxiliary attachment part. Then, remove the obturator while keeping pressure on the blood vessel with your fingers to prevent blood from flowing into the catheter.

Next, the tip of the syringe is inserted and fitted into the catheter hub 14, and blood is aspirated and sampled. After this, if there is no need to sample blood for a while, the obturator is inserted into the catheter again to remove the blood in the catheter, in preparation for the next blood sampling.

Specific Effects of the Invention The intravascular obturator of the present invention does not require injection of an anticoagulant such as heparin, and is therefore easy to operate. Furthermore, since the distal end of the obturator is rounded with a plastic material, even if the distal end of the obturator protrudes when the obturator is inserted into the catheter, it will not damage the blood vessel wall. In addition, since the embolus part is entirely covered with plastic material, the surface of the embolus part is smooth and there is no possibility of blood coagulation. In addition, even if the plugging part is thin, it is made of a metal core covered with plastic material, so it is sturdy and easy to operate.

Furthermore, if the tip of the embolus part is formed to match the shape of the tip of the catheter, and the tip is shaped so that it slightly protrudes from the tip of the catheter and is rounded, blood can be more completely removed and the blood vessel secured. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of one embodiment of an obtiturator for an intravascular indwelling catheter of the present invention, FIG. 2 is an enlarged sectional view of an embolus portion of another embodiment of the present invention, and FIG. FIG. 4 is a cross-sectional view of an embolus portion according to another embodiment of the present invention, and FIG. 4 is a perspective view of an indwelling needle. DESCRIPTION OF SYMBOLS 1... Embolus part, 2... Core material, 3... Plastic material, 4... End of embolus part, 5... Flange part, 6
... Locking part, 7 ... Hub, 8 ... Opening, 9 ...
Main mounting part, 10... Auxiliary mounting part, 11... Stepped part, 1
2... Passageway, 13... Adhesive member, 14... Catheter hub, 15... Catheter, 16... Inner needle hub, 17... Puncture needle, 18... Threaded protrusion piece.

Claims (1)

[Scope of Claims] 1. In an obturator for an intravascular indwelling catheter for occluding a flow path in the catheter of an intravascular indwelling catheter consisting of a catheter and a catheter hub, a metal core material is coated with a resin, The plug member has an outer diameter that is approximately the same as the inner diameter of the catheter and has a rounded tip, and a hub that engages with the catheter hub fixed to the proximal end of the plug member. An obturator for intravascular indwelling catheters. 2. The hub includes a main attachment portion having an outer wall surface that engages with an inner wall surface of the catheter hub, and a main attachment portion extending from the rear end of the main attachment portion toward the distal end of the plug member and provided on the outer wall of the catheter hub. 2. The obturator for an intravascular indwelling catheter according to claim 1, comprising a threaded protrusion and a cylindrical auxiliary attachment portion having a threaded thread on its inner circumferential wall.