JP3181637U - Subcutaneous infusion catheter - Google Patents

Abstract

An object of the present invention is to easily raise an extracorporeal tube at the proximal end of a catheter at a skin piercing portion without rotating the catheter, and to maintain this shape during administration of an infusion solution. To provide a percutaneous indwelling catheter that can be aseptically restored, can be aseptically operated, can be maintained in a good condition, and can be stably placed over a long period of time. .
One or more plastically deformable metal wires are embedded in a tube wall of a large-diameter extracorporeal indwelling portion along the longitudinal direction.
[Selection] Figure 2

Description

The present invention relates to a catheter that is placed percutaneously in the body of an animal and performs repeated medication, infusion, drainage, and the like.

Subcutaneous infusion therapy for small animals is usually performed at a veterinary hospital by a medical worker using a winged metal needle. However, the treatment of kidney diseases that frequently occur in older cats requires repeated infusions over a long period of time, and in order to avoid frequent needle punctures, catheters should be placed subcutaneously and infusions should be performed from this route. Has been made. In addition, there are an increasing number of cases where owners perform infusion treatments at home, but needle puncture is a difficult task for the general public. At first, a medical worker indwelling a catheter at a veterinary hospital uses this catheter. In many cases, owners infuse fluids at home.

The catheter is usually placed on the dorsal side of the neck to prevent the animal from being pulled out or damaged by the intense movement of the animal during placement. Specifically, the hair on the back side of the neck is cut into a puncture part, a small incision is made in the part with a scalpel, a catheter equipped with a stylet is inserted subcutaneously, and it is pushed forward toward the tail side as it is. After long insertion, the stylet is removed and the indwelling procedure is completed. Infusion administration is performed by connecting an infusion line to the catheter adapter. After the administration is completed, until the next administration, the adapter is capped to prevent damage, infection protection is provided, and the extracorporeal tube is placed along the body surface. Fixed. When performing the infusion again, lift it up and connect it to the infusion line without touching the body surface and hair to prevent infection.

Since the extracorporeal indwelling part of the subcutaneous infusion catheter is placed along the body surface, the extracorporeal tube and the adapter at the proximal end are in contact with the skin. When attaching / detaching to / from the infusion line, it is necessary to lift the adapter from the body surface and attach / detach it to / from the infusion line so that the opening of the adapter does not come into contact with the body surface or hair. Conventionally, since one hand is taken to lift the extracorporeal tube portion, preparation for connection and disinfection of the outer surface of the adapter and the like are performed with one hand, and it has been difficult to ensure the complete preparation operations. In addition, even after the start of infusion administration, the outer surface of the connection part touches the body surface, which increases the risk of bacterial infection.

In order to solve the above problem, the inventor of the present invention has provided a hand for an indwelling portion of a catheter main body in a small-diameter catheter comprising a single lumen tube having an open end and an adapter provided at the proximal end of the tube. A subcutaneous infusion catheter characterized in that the transition site that transitions from the end to the extracorporeal indwelling portion gradually increases in diameter and thickness toward the proximal end portion to form a funnel shape, and the funnel-shaped portion is curved and shaped. The idea was made and disclosed in the actual application 2011-004491. This eliminates the trouble of kinking, breakage, and removal outside the body of the catheter.Furthermore, the infusion set is easy to attach and detach, the risk of bacterial infection associated with the attaching and detaching operation is small, and the backflow of the administered infusion from the skin puncture site We proposed a subcutaneous infusion catheter that can minimize leakage.

However, for this catheter, each time an infusion is administered, the curved shaped part fixed along the body surface is raised so that the axis of the indwelling catheter is twisted 90 degrees, and connected to the infusion line, After the administration of the infusion solution, it is fixed by being laid down along the body surface in a twisted direction again, so that the catheter is repeatedly rotated at the skin puncture of the catheter. The catheter seal gradually became loose, leading to bacterial infection and fluid leakage from the skin puncture entrance, and the problems were not solved sufficiently.

The present invention aims to solve such conventional problems, and easily raises the extracorporeal tube at the proximal end of the catheter without rotation of the catheter at the skin insertion portion, By maintaining this shape during infusion administration and allowing it to be restored easily after completion of administration, aseptic manipulation can be facilitated, and the catheter skin puncture is kept in good condition. An object of the present invention is to provide a percutaneous indwelling catheter that can be stably placed over a long period of time.

A subcutaneous infusion catheter according to the present invention for achieving the above object has a structure in which one or a plurality of plastically deformable metal wires are embedded in the tube wall of a large-diameter extracorporeal indwelling portion along the longitudinal direction. Features. Furthermore, the purpose of more effectively is achieved by applying a structure in which the diameter of the portion that transitions from the small diameter tube disclosed in the actual application 2011-004491 to the proximal end large diameter tube is gradually increased and tapered. Can be achieved.

The subcutaneous infusion catheter 1 of the present invention has one or more plastically deformable metal wires 14 embedded in the wall of the extracorporeal tube 5 along the longitudinal direction, so that the extracorporeal tube 5 can be easily bent and stretched. Can be shaped. Further, since an external force is not directly applied to the skin puncture 15 with this operation, the risk that the catheter 1 is displaced at the skin puncture 15 is greatly suppressed.

1 is a schematic view of a subcutaneous infusion catheter 1 of the present invention (hereinafter “catheter 1”) and a stylet 11 for assisting insertion of the catheter 1. FIG. 1 is a schematic view showing a part of a catheter 1 of the present invention in cross-section. It is sectional drawing which shows the Example from which the extracorporeal tube 5 differs. 1 is a schematic view showing a situation of clinical use of a catheter 1. FIG.

The catheter 1 of this invention is demonstrated in detail based on each drawing.
As shown in FIG. 1, the catheter 1 includes an in-vivo indwelling portion 2 and an in-vivo indwelling portion 3 connected integrally therewith. The indwelling part 2 is composed of a long and narrow body tube 4 having a distal end 7 and a side opening 8 and a tapered tube 6 integrally therewith. The indwelling part 3 includes a large-diameter extracorporeal tube 5 and an extracorporeal tube. It consists of an adapter 10 disposed at the proximal end of the tube 5. Furthermore, a thread hook 9 is integrally disposed on the catheter 1 at the boundary between the in-vivo indwelling portion 2 and the extra-corporeal indwelling portion 3.

The outer diameter of the indwelling tube 4 is usually 1 to 3 mm and the length is 100 to 300 mm. The external diameter of the extracorporeal tube 3 is 5 mm to 10 mm, and the length is 30 mm to 50 mm. As the material for the indwelling portion 2 and the extracorporeal tube 3, a flexible and elastic material such as polyurethane, nylon elastomer, polyvinyl chloride, or silicon rubber is preferably used.
While the catheter 1 is indwelling, it is necessary to fix the catheter 1 firmly to the skin. Generally, the catheter 1 is sutured and fixed to the skin. However, in the thread hook 5 shown in FIG. The ligatures are ligated and secured to the skin with this suture. Also, there is a hole in the wing, and it is fastened to the catheter with a winged thread hook (not shown) that sutures the skin through the hole and a flexible tube that is often used for central venous catheters. It is also possible to apply tools (not shown) with different methods.

A stylet 11 shown in FIG. 1 is a tool for giving rigidity to the catheter 1 and guiding the insertion under the skin when the catheter 1 is placed, and is inserted into the catheter 1 so as to protrude from the distal end 7. After inserting the catheter 1 into the living body for a predetermined length, the stylet 11 is removed while leaving the catheter 1.

FIG. 2 is a schematic view of the catheter 1 including a cross-sectional view of the extracorporeal indwelling portion 3. One or more metal wires 14 shorter than the extracorporeal tube 5 are embedded in the wall of the extracorporeal tube 5 along the longitudinal direction. When an external force is applied to the extracorporeal tube 5 and bent, the metal wire 14 is also deformed, and even if the external force is removed, the deformed state is maintained by the holding force of the plastically deformed metal wire 14.
The metal wire 14 is made of plastic deformable wire such as aluminum having a diameter of about 1 mm or brass, and the extracorporeal tube 5 in which these wires are embedded can be repeatedly bent and stretched easily with fingers. It is a good one.

FIG. 3 illustrates an extracorporeal tube 5 having a different cross section. In FIG. (A), the cross-sectional outer shape of the extracorporeal tube is circular and one metal wire is embedded, and FIG. (B) shows the cross-sectional outer shape. An embodiment is shown which is circular and has two metal wires embedded therein. FIG. (C) shows an embodiment in which the cross-sectional outer shape is oval and two metal wires are embedded at a position on the long axis.

In particular, the embodiment of FIG. (C) is easier to bend and shape than the embodiment of FIGS. (A) and (B), and is easy to bend back and sits well on the skin surface. It is excellent in that it can be stably placed.

The state of placement of the catheter 1 of the present invention is as shown in FIG. First, a small incision is made in the skin with a scalpel to create a skin piercing opening 15, and the catheter 1 is inserted into the small opening. While the catheter 1 is not used for infusion administration, the extracorporeal indwelling unit 3 is placed along the body surface, and the mouth of the adapter 10 is plugged with a plug 17. When administering an infusion, as shown in the dotted line diagram, if the extracorporeal tube is bent and the adapter is raised, the embedded metal wire 14 is also bent, and the bent shape of the extracorporeal tube is maintained by the shape retaining force of the metal wire 14. Is done.

As described above, the catheter 1 of the present invention has one or more plastically deformable metal wires 14 embedded in the wall of the extracorporeal tube 5 along the longitudinal direction, so that the extracorporeal tube 5 can be easily bent and stretched. Can be shaped freely. Further, since an external force is not directly applied to the skin puncture 15 with this operation, the risk that the catheter 1 is displaced at the skin puncture 15 is greatly suppressed.

DESCRIPTION OF SYMBOLS 1 Subcutaneous infusion catheter 2 In-body indwelling part 3 In-vivo indwelling part 4 In-vivo tube 5 In-vivo tube 6 Tapered part 7 Tip port 8 Side port 9 Thread hook 10 Adapter 11 Stylet 12 Metal rod 13 Adapter 14 Metal wire 15 Skin piercing 16 Suture Thread 17 Plug

Claims (4)

In a small-diameter catheter comprising a single lumen tube and an adapter provided at the proximal end of the tube, the proximal end of the catheter has a large diameter and is plastically deformable in the longitudinal direction within the large-diameter tube wall. A subcutaneous infusion catheter characterized in that one or more metal wires are embedded. The outer cross section of the large diameter tube is made into an oval shape, the cross section of the lumen is made into a substantially small circle, and one plastic deformable metal wire is placed at the center of the left and right tube walls where the major axis of the oval shape intersects. The subcutaneous infusion catheter according to claim 1, which is embedded. 2. The subcutaneous infusion catheter according to claim 1 or 2, wherein a portion that transitions from a small-diameter tube to a proximal-end large-diameter tube has a tapered shape that gradually increases in diameter. The subcutaneous infusion catheter according to any one of claims 1, 2, and 3, wherein a thread hook is disposed at a site where the small diameter tube transitions to the proximal end large diameter tube.