JP2595486Y2 - Medical drainage 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 medical drainage catheter having a flat cross section for preventing the lumen from being blocked by bending or internal negative pressure.

[0002]

2. Description of the Related Art Conventionally, as a process after a thoracic operation such as a heart operation, a drainage catheter is indwelled in a patient's body to discharge a leaked substance such as an exudate or blood bleeding, and a low-pressure suction is continuously performed. The method is widely used. As a catheter used for drainage after surgery such as thoracic surgery, a hollow catheter having a circular cross section or an elliptical cross section,
A flat hollow catheter such as an ellipse is used, but the latter flat catheter is preferably used in order to avoid local compression on organs, tissues and the like.

[0003]

However, the longitudinal shape of a conventional flat catheter is shown in FIG.
As described above, since it is linear and has poor shape retention,
When placed in the patient's body, especially in the posterior part of the heart, it not only has the disadvantage of bending due to external force and closing the lumen 4 due to internal negative pressure, but also has poor operability in placing it in the patient. It had the disadvantage of becoming slightly more complicated.

[0004] Therefore, the present invention is, cross-section can be improved according drawbacks improved operability on procedure when placed in a patient, to prevent blockage of the lumen further by bending or internal negative pressure due to an external force Is intended to provide a flat medical drainage catheter.

[0005]

SUMMARY OF THE INVENTION The present invention achieves the above-mentioned object, and has a hollow section having a flat cross section and a long axis.
Harder than the surroundings is embedded in the side wall in the direction
And the shape of the hollow part is almost the same as other parts
A drainage catheter for medical use, characterized in that a bent portion is formed .

[0006]

Oite medical drainage catheter in the [action] The present invention
Is that the cross section of the catheter is flat and hollow
The minimum stress for different pressures from surrounding organs.
The flat direction can be adjusted freely as
Without excessive pressure on the surrounding organs,
In the flat hollow long axis side wall, a harder
Strong material is buried and closed by bending or internal negative pressure
No blockage. Furthermore, the shape of the hollow part is
Since a bent portion with almost the same shape is formed,
When it is linear, it is used where it needs to be bent in the body
If necessary, align the bend of the catheter with this point.
Can cause blockage due to bending.
It can be fixed without embarrassment.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. 1 and 2, reference numeral 1 denotes a medical drainage catheter according to the present invention . The catheter 1 has a flat hollow cross section, and has a circumferential side wall 5 in a longitudinal side wall 5 of the cross section.
The reinforcement member 7 is embedded in the
The hollow part is almost the same shape as the other part in the length direction of the
A bent portion 2 having one shape is formed.

[0008] The medical drainage catheter 1 of the present invention.
That the material used for the main portion other than the reinforcing member 7 is generally mosquito
Anything used for Tetel
Preferably, organic polymer elastomers are mainly used. Organic high
Molecular elastomers have rubber-like elasticity around room temperature
For example, latex rubber, ethylene-acetic acid
Silicones such as vinyl copolymers and organopolysiloxanes
Rubber, polyurethane, soft polyvinyl chloride, etc.
The cross section of these materials is flat and hollow by extrusion molding, etc.
Obtain a catheter.

[0009] The medical drainage catheter 1 of the present invention.
The cross-sectional shape should be various elliptical shapes,
The thickness of the peripheral side wall of the tell is constant, and both side walls in the short axis direction are parallel
Wall thickness in the long axis direction and short axis direction
Can be changed. The catheter 1 is provided with a side hole 3 for drainage suction as necessary.
The number and shape may be arbitrary.

The material of the reinforcing member 7 is an organic polymer plus
Relatively elastic with metals such as ticks, iron, aluminum and copper
Any material may be used as long as it has properties.
Organic polymer that forms the main part other than the reinforcing material 7 of TETEL
The composition of the elastomer and the unit monomer is the same,
Hardness differs due to differences in strength and plasticizer content.
Is particularly preferable in terms of compatibility, strength and the like.
Furthermore, the organic polymer plastic material used for this reinforcing material
Materials such as bismuth tungstate and barium sulfate
A shadow agent may be contained. The reinforcing material has a cross-sectional length of
It may be embedded only in one side wall in the axial direction.

[0011] The medical drainage catheter 1 of the present invention.
The position of the bent portion 2 formed in the length direction is within a range that fits inside the body.
If it is an enclosure, any may be sufficient. The bending angle may be arbitrary, but 4
5-150 degrees is preferred. What is the method of forming the bent part 2
Although the following method may be used, for example, there is the following method. Up
The cross section obtained by the molding method described above cures a flat hollow catheter.
Heated for a fixed time at the temperature required for heat fixing
After cooling, it is obtained by cooling. The jig has a cross section
It has an outer diameter approximately the same as the inner diameter of the catheter.
Therefore, the bent part has almost the same diameter as the other parts.
You.

Specific Example 1 A feed block die including two extruders is provided.
Simultaneously extruding different resins using the extruder
The catheter having the flat cross section shown was extruded. What
In addition, the resin of the main part other than the reinforcing material 7 of the catheter 1 is acceptable.
Cross section using soft polyvinyl chloride containing 50% plasticizer
The plasticizer is embedded in the reinforcing material embedded in the side wall 5 in the long axis direction.
Polyvinyl chloride containing 0% was used. This catheter
Of the cross section of the long axis direction is 8 mm, and the short axis direction is 3
mm, the wall thickness is 1.5 mm, and the long side wall of the cross section
The thickness of the reinforcing material embedded in 5 in the long axis direction is 1 mm and the short axis
The length in the direction was 3 mm.

[0013] Cut this catheter into 50cm lengths
And an L-shape having an outer diameter approximately equal to the inner diameter of the catheter
Of the stainless steel jig. This is 100
Removed after heat treatment for 1.5 hours in a hot air dryer at ℃
And cooled at room temperature for 2 hours. After removing the jig,
A flat catheter with a bend was obtained. This cat
When a negative pressure was applied to the ter using a suction pump,
The central part of the short side wall is crushed, but the long side wall is
Is maintained without crushing and the catheter is patent
Was.

As a comparative example, the inside of the side wall 5 in the longitudinal direction of the section
No reinforcing material is embedded in the
Connect a straight catheter to the catheter that has been heat treated as described above.
When folded at the same angle as the
The surface shape was deformed and reduced at the bent portion, and the lumen was closed.

[0015]

As is apparent from the above description, according to the medical drainage catheter of the present invention, the medical catheter is placed in the body of a patient.
Less pressure on surrounding organs,
No blockage due to bending or internal negative pressure.
When it needs to be bent in the body
By using the bent part in this place,
It is possible to prevent clogging due to folding Re bend.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a medical drainage catheter according to the present invention.

FIG. 2 is a cross-sectional view of one embodiment of the medical drainage catheter according to the present invention.

FIG. 3 is a perspective view of a conventional medical drainage catheter.
The same reference numerals are used for the same or equivalent components in the drawings.
Attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Medical drainage catheter 2 Bending part 3 Drainage suction side hole 4 Catheter lumen 5 Long side wall in cross section 6 Short side wall in cross section 7 Reinforcing material

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Satoshi Takatsuka 23 Uji Kozakura, Uji-city, Kyoto Unitika, Ltd. (56) reference Patent flat 2-102665 (JP, a) JP Akira 60-90569 (JP, a) JitsuHiraku Akira 61-71135 (JP, U) (58 ) investigated the field (Int.Cl. ⁶ , DB name) A61M 25 / 00,27 / 00

Claims (1)

(57) [Scope of request for utility model registration] 1. A cross section having a flat hollow shape and a longitudinal direction thereof
Harder than the surroundings is embedded in the side wall of
And the shape of the hollow part is almost the same as the other parts.
A drainage catheter for medical use, wherein a formed bent portion is formed .