JP3206877B2 - Medical drain tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain tube for draining blood or body fluid exuding from a wound after surgery.

[0002]

2. Description of the Related Art Drain tubes are widely used as surgical medical devices for discharging body fluids, and products having various inner and outer diameters, cross-sectional structures and shapes are commercially available. The conventional drain tube has a structure in which bodily fluid flows into and out of the tube from the distal end of the tube when inserted into the body fluid storage site, or from the distal end and side hole of the tube when the tube has side holes. It has become. The problem with the use of these tubes is that when the wound of the patient heals, the body tissue grows into the side hole of the tube, resulting in tearing of the body tissue upon removal of the drain tube, and The drain tube may be severely damaged, and the drain tube may be cut off due to the high resistance to removal.

[0003] As a countermeasure for these, there is provided a side hole connecting an inner cavity and an outer side provided at a certain inclination angle with respect to a center axis from a drain tube withdrawing direction (for example, in Japanese Patent Application Laid-Open No. 1-223975). The inclination angle is set to 30 to 80 °). This means that even if the surrounding tissue enters each side hole while the drain tube is indwelled, the tissue is easily removed from the side hole when removed, compared to when the side hole is perpendicular to the central axis, The resistance at the time of removal can be reduced. However, since the angle between the side hole and the central axis of this drain tube is large to some extent, when the drain tube is removed, a large angle difference occurs between the removal direction and the direction in which the tissue that has penetrated the side hole moves inside the side hole. However, there is a problem in that the invaded tissue does not come off and does not lead to a large reduction in withdrawal resistance or a reduction in the pain of the patient at the time of withdrawal. In addition, a sufficient wall thickness is required in order to have an effective inclination angle, and the inner diameter becomes narrow, so that it cannot be applied to a thin and flexible tube.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks and the current state of the conventional drain tube, and has as its object to remove the tissue that has entered the side hole when the drain tube is removed. It is an object of the present invention to provide a drain tube which can be smoothly removed from a side hole and does not cause pain to a patient.

[0005]

That is, the present invention relates to a drain tube which is retained in a body and discharges a liquid or gas outside the body, wherein a longitudinal section of an outer wall of the body retention section has a plurality of steps. It has a staircase shape, and the surface facing the removal direction of the inner and outer surfaces of the step has a gentle inclination angle with respect to the central axis of the drain, and the surface facing the tip has an outer surface and a lumen that is almost parallel to the central axis. It is a medical drain tube having a side hole for connection.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a drain tube according to the present invention, FIG. 2 is an exploded view of an indwelling part (1), and FIG. 3 is a detailed sectional view of the indwelling part (1). The drain tube of the present invention includes an extracorporeal projection (2) formed of a straight tube, and an indwelling part (1) connected to the distal end and serving as a liquid collecting part for collecting bodily fluids.

The indwelling portion (1) is formed by winding a sheet (6) having a shape as shown in a development view of FIG. 2 in a tube shape and having an inner cavity (3). A groove (7) is provided. The direction of the groove (7) of the sheet (6) is arranged so as to be substantially parallel to the central axis (9) when wound, and when the sheet is wound into a tube as shown in FIG. 3 is a side hole (4) connecting the outer surface substantially parallel to the central axis (9) and the lumen (3). At this time, the direction of the side hole (4) is directed to the tip (5). The direction of the side hole (4) is desirably at an angle of 0 to 30 ° with respect to the central axis (9). When the sheet (6) in FIG. 2 is wound, the ends of the adjacent sheets (6) are joined with a marginal portion (10) as shown in FIG. The joining method is adhesion.

The indwelling portion (1) of the drain tube constructed in this manner can be suctioned (12) from the tip and sucked (13) from the side hole on the side surface of the indwelling portion (1). . Further, the longitudinal section of the outer wall of the indwelling part (1) has a stepped shape having a plurality of steps, and the surface of the stepped portion facing the removal direction (8) of the inner and outer surfaces is loose with respect to the drain center axis (9). It will have a tilt angle. The inclination angle is determined by the thickness of the sheet (6), the sheet width (11) and the inner diameter, and the inclination angle increases as the sheet (6) becomes thicker, the sheet width (11) becomes smaller, and the inner diameter becomes larger. Becomes larger. As a result, the step of the indwelling part (1) becomes larger, and the resistance is increased by being caught by the body tissue (14) at the time of removal. Therefore, in consideration of the reduction of the withdrawal resistance, it is desirable to set these values so that the inclination angle is in the range of 1 to 30 °, preferably 1 to 10 °. Consider that the inner diameter of the lumen (3) should be 50% or more of the outer diameter.

The outer diameter of the indwelling part (1) is not limited,
In this embodiment, the thickness is 3.5 to 12 mm. At this time, the thickness of the sheet (6) is 0.5 to 2 mm and the groove (7)
The depth of the sheet is 0.2 to 1.5 mm, and the sheet width (11) is 5 to
It is 50 mm. The material of the drain tube may be a material generally used for medical purposes such as a flexible silicone rubber or a soft vinyl chloride resin, and is not particularly limited. Barium sulfate, bismuth subcarbonate,
It is desirable to mix a contrast substance such as bismuth oxide.

The indwelling part (1) may have an oval shape in addition to a circular cross section. The indwelling part (1) and the extracorporeal protrusion (2)
Is bonded by adhesion, but is not particularly limited. Next, the effect of the drain tube according to the present invention will be specifically described. FIG. 4 is a detailed cross-sectional view of the vicinity of the side hole (4) after the indwelling section (1) is indwelled in the patient's body and a certain indwelling period has elapsed. At this time, the body tissue (14) is shown in FIG.
As shown in the figure, the state has entered the side hole (4). FIG. 5 is FIG.
FIG. 4 is a detailed sectional view of the vicinity of the side hole (4) when the drain tube is started to be removed in the removal direction (8) from the state shown in FIG. Since it is provided at an angle close to parallel, the body tissue (14) that has entered the side hole (4) can be pulled out without being caught. This makes it possible to remove the drain tube with extremely low resistance. In addition, there is no danger of clogging because a sufficient lumen size is secured.

[0011]

As described above, when the drain tube according to the present invention is used, the body tissue that has entered the side hole during the indwelling in the body can be smoothly removed, so that the drain tube can be prevented from being cut, and the patient can be easily and suffered. The drain tube can be removed without burden. Therefore, it is extremely useful as a safe and reliable drain tube.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a drain tube according to the present invention.

FIG. 2 is an exploded view of an indwelling part of the drain tube according to the present invention.

FIG. 3 is a detailed sectional view of an indwelling part of the drain tube according to the present invention.

FIG. 4 is a detailed sectional view of the vicinity of a side hole after the indwelling portion of the drain tube according to the present invention is indwelled in a patient's body and a certain indwelling period has elapsed.

5 is a detailed sectional view of the vicinity of a side hole when the drain tube according to the present invention starts to be removed from the state of FIG. 4 in the removal direction.

[Explanation of symbols]

 1. 1. Indwelling unit Extracorporeal protrusion 3. Lumen 4. Side hole 5. Tip 6. Sheet 7. Groove 8. Removal direction 9. Central axis 10. Glue part 11. Seat width 12. Suction from the tip 13. Suction from side hole 14. Body tissue

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A61M 1/00 A61M 25/00 A61M 27/00

Claims (1)

(57) [Claims] 1. A drain tube for indwelling a body and discharging a liquid or gas out of the body, wherein a longitudinal section of an outer wall of the indwelling part has a stepped shape having a plurality of steps.
The surface facing the removal direction of the inner and outer surfaces of the step portion has a gentle inclination angle with respect to the central axis of the drain, and the surface facing the distal end has a side hole that connects the outer surface and the lumen substantially parallel to the central axis. A medical drain tube, characterized in that: