JP2000126121A - Valve device for medical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve device for a medical instrument that retains airtightness and liquid tightness even if the base portion of the medical instrument to be inserted bends, and excels in operability and cleanability. SOLUTION: This valve device 1 for a medical instrument comprises a two- stage tube-form hard insertion tube 5, and a cylindrical valve member 7 made from an elastic material where convex portions 6 fitted detachably into circumferential grooves of the insertion tube 5 are provided in the inside periphery of the front end. A sheet valve portion 11 that tightly contacts the outer surface of the medical instrument is provided in the valve member 7, a cylindrical portion 14 projected rearward from the valve portion 11 and having an internal hole 13 is provided. Therefore, no stress is applied to the neighborhood of the valve portion 11 by the cylindrical portion 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical device valve device for inserting a medical device.

[0002]

2. Description of the Related Art At present, endoscopes are widely used in the medical field, for example, esophageal varices sclerotherapy for injecting a sclerosing agent into esophageal varices to cure and extinguish them, and endoscopy in blood vessels. When performing observation, observation and treatment are performed by inserting the insertion portion of the endoscope through a catheter. In some cases, a treatment tool is inserted through a treatment tool channel provided in an endoscope, and the affected part is treated using the treatment tool.

Generally, when an endoscope is inserted into a catheter or a treatment tool is inserted into a treatment tool channel of the endoscope, air, blood, or the like is prevented from leaking out of the catheter or the treatment tool channel to the outside. For this purpose, a valve device for sealing is provided near the entrance of the catheter or the treatment tool channel.

[0004] Such a valve device is disclosed in, for example, Japanese Utility Model Publication No. 7-49921.
This valve device has a configuration in which a plurality of valve bodies as seal members are provided in the axial direction on the inner surface of the insertion hole of the mantle tube through which the insertion portion of the endoscope is inserted. When the rear portion is bent from the seal member of the insertion portion, the insertion portion is bent around the position of the rearmost seal member as a fulcrum,
The rearmost seal member is stressed in the bending direction and the airtightness of that portion is impaired, but since another seal member is disposed in front, the other seal member maintains airtightness. .

[0005]

[0007] However, the actual fairness 7-4
In the valve device of No. 9921, since the seal member is provided at a plurality of locations, the frictional resistance when the insertion portion of the endoscope advances and retreats with respect to the mantle tube becomes large, and it is difficult to operate, or The outer surface of the insertion portion may be worn.

Further, since a plurality of seal members are provided in the axial direction, there is a valley between the seal members and it is difficult to clean. The present invention has been made in view of such circumstances, and can maintain air-tightness and liquid-tightness even when the proximal end side of a medical instrument to be inserted is curved, thereby improving operability. It is an object of the present invention to provide a medical device valve device that is excellent in cleaning performance.

[0007]

Means for Solving the Problems In the present invention, claim 1 is provided.
The invention according to the present invention, in a medical device valve device body for inserting a medical device, one valve portion that is in close contact with the outer surface of the medical device,
When the medical device is curved, the rear end portion is formed of an elastic protrusion that protrudes rearward from the valve portion and contacts the outer surface of the medical device to regulate the bending of the medical device.

[0008] In the invention according to claim 2, the projection is
It is formed in a cylindrical shape having an inner diameter slightly larger than the outer diameter of the medical device and a sufficient length in the longitudinal axis direction relative to the outer diameter of the medical device.

Further, in the invention according to claim 3, the projecting portion is formed such that the rear portion has greater elasticity than the front portion.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment according to the present invention will be described with reference to FIGS. 1 is a cross-sectional view of the valve device, and FIG. 2 is a diagram showing a state in which the proximal end side of the treatment tool inserted through the valve device is curved.

As shown in FIG. 1, a valve device 1 for a medical instrument is provided.
Is provided continuously with the small-diameter insertion portion 2 behind the insertion portion 2,
A two-stage tubular rigid insertion tube 5 comprising a large-diameter valve mounting portion 4 having a concave circumferential groove 3 on the outer peripheral surface, and a convex portion detachably fitted to the circumferential groove 3 of the insertion tube 5. 6 protrudes from the inner peripheral surface of the front end, and comprises a cylindrical valve member 7 made of an elastic material such as fluorine rubber or silicon rubber.

The insertion tube 5 is provided with an inner hole 8 having an inner diameter such that the outer diameter of a medical instrument such as an endoscope or a treatment tool can be inserted therein. It is tapered so as to have a larger diameter.

The valve member 7 is provided with a sheet-like valve portion 11 which is in close contact with the outer surface of the medical device at a position where the valve member 7 comes into contact with the rear end surface 10 of the insertion tube 5. A circular hole 12 having a circular shape smaller than the outer diameter is provided. Further, a cylindrical portion 14 having an inner hole 13 is provided to protrude rearward from the valve portion 11. The inner hole 8 of the insertion tube 2, the circular hole 12 of the valve portion 11, and the inner hole 13 of the tubular portion 14 are set to be concentric.

The inner diameter of the inner hole 13 of the cylindrical portion 14 is set slightly larger than the outer diameter of the medical instrument so as not to wear the outer surface of the medical instrument passing therethrough. The length L of the cylindrical portion 14 in the longitudinal direction is such that when the rear portion is bent from the valve portion 11 of the medical device, the rear end of the inner surface of the inner hole 13 contacts the outer surface of the medical device. And the valve portion 11 of the medical device
The length is set sufficiently longer than the outer diameter of the medical device so as to restrict the curvature in the vicinity of. The optimum value of the length L differs depending on the elastic modulus of the material of the valve member 7, the flexibility of the medical instrument to be inserted, and the like, but is preferably 10 mm or more.

Next, the operation will be described with reference to an example in which the treatment tool is inserted through the valve device. First, a treatment tool is inserted through the inner hole 13 of the cylindrical portion 14, and the circular hole 12 of the valve portion 11 and the insertion portion 2 are inserted.
Through the inner hole 8 in this order. At this time, the circular hole 1 of the valve portion 11
2 is smaller than the outer diameter of the treatment instrument, but since the valve portion 11 is formed of an elastic member, the valve portion 11 is in close contact with the outer surface of the treatment instrument by its elastic force. The area before and after that is shut off in a liquid-tight and air-tight manner.

When the proximal end side of the treatment tool is bent while the treatment tool is inserted through the valve device 1, the outer surface of the treatment tool contacts the inner surface of the inner hole 13 of the cylindrical portion 14. . When it is further curved, as shown in FIG. 2, the cylindrical portion 14 is subjected to a bending stress, and bends following the bending of the insertion portion. On the other hand, the treatment instrument is restricted from bending by contacting the inner surface of the inner hole 13 of the tubular portion 14, and does not bend around the valve portion 11 and maintains a substantially linear state near the valve portion 11, Since no stress due to bending is applied to the valve portion 11, the valve portion 11
The liquid and air tightness before and after are secured.

Next, effects of the first embodiment will be described. By providing the cylindrical portion, even if the rear portion of the valve portion of the inserted medical instrument is curved, the front and rear portions of the valve portion can be shut off in a liquid-tight and air-tight manner.

Further, since the valve is provided at one place,
Even if the medical device is advanced or retracted with respect to the valve device, the frictional resistance between the valve portion and the outer surface of the medical device can be reduced, the operation is easy, and the outer surface of the medical device does not wear.

Further, since openings are formed before and after the valve portion, a cleaning brush or the like can be inserted up to the valve portion, so that cleaning is easy. Furthermore, since the insertion tube and the valve member are configured to be detachable, the insertion tube or the valve member can be replaced and used depending on the medical device.

(Second Embodiment) A valve device according to a second embodiment will be described with reference to FIG. FIG. 3 is a sectional view of the valve device. Hereinafter, the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 3, in the valve device 16 according to the second embodiment, the portion from the front end of the outer surface of the valve member 7 to the rear of the valve portion 11 is made of a hard material such as metal. The ring 17 is fitted outside.

Next, the operation will be described. When the proximal end side of the medical device is bent while a medical device such as a treatment tool is inserted through the valve device 16, the outer surface of the treatment tool contacts the inner surface of the inner hole 13 of the tubular portion 14. When further curved, the cylindrical portion 14 is subjected to a bending stress, and bends following the bending of the insertion portion. On the other hand, the treatment instrument is restricted from bending by contacting the inner surface of the inner hole 13 of the tubular portion 14, and does not bend around the valve portion 11 and maintains a substantially linear state near the valve portion 11, Since the stress due to the bending is not applied to the valve portion 11, liquid tightness and air tightness before and after the valve portion 11 are ensured.

Further, since the hard ring 17 is fitted around from the front end of the valve member 11 to the rear part of the valve portion, the ring 17 regulates the deformation of the valve portion 11.

Next, effects of the second embodiment will be described. In the second embodiment, in addition to the effects of the first embodiment, since the ring is externally fitted to the valve portion,
Even if the rear part of the valve part of the inserted medical instrument is bent, the stress due to the bending is hardly transmitted to the valve part and the deformation of the valve part is regulated,
The front and rear portions of the valve section can be shut off more precisely in a liquid-tight and air-tight manner.

(Third Embodiment) A valve device according to a third embodiment will be described with reference to FIG. FIG. 4 is a sectional view of the valve device.

As shown in FIG. 4, the valve device 20 according to the third embodiment is provided with a small-diameter insertion portion 2, which is provided behind the insertion portion 2, and is larger than the inner hole 8 of the insertion portion 2. Inner bore 2 of inner diameter
A two-stage tubular rigid insertion tube 24 composed of a large-diameter valve mounting portion 23 having a concave circumferential groove 22 on the inner surface of the inner tube 1 and detachably fitted into the circumferential groove 22 of the insertion tube 24. The convex portion 25 is provided on the outer peripheral surface of the small-diameter portion 26 having a small diameter, and the entire outer surface of the small-diameter portion 26 is constituted by a cylindrical valve member 27 made of an elastic material and fitted to the valve mounting portion 23. .

The boundary between the inner hole 8 and the inner hole 21 of the insertion tube 24 is tapered. The valve member 27 includes a small-diameter portion 26.
A valve portion 11 having a circular hole 12 is provided on a front end face of the valve member, and a large-diameter cylindrical portion 28 having an inner hole 13 is formed behind the small-diameter portion 26. The outer diameter of the cylindrical portion 28 is tapered so as to decrease from the middle portion 29 to the rear end, and the outer end is thinner toward the rear end, so that the elasticity is increased.

Next, the operation will be described. When the proximal end side of the medical device is bent while the medical device is inserted through the valve device 20, the outer surface of the treatment tool contacts the inner surface of the inner hole 13 of the tubular portion 28. When further curved, the cylindrical portion 28 is subjected to a bending stress and bends following the bending of the insertion portion. On the other hand, the treatment tool is restricted from bending by contacting the inner surface of the inner hole 13 of the cylindrical portion 28, and does not bend around the valve portion 11 and maintains a substantially linear state near the valve portion 11, Since the stress due to the bending is not applied to the valve portion 11, liquid tightness and air tightness before and after the valve portion 11 are secured.

Further, since the outer surface of the small diameter portion 26 is externally fitted by the rigid valve mounting portion 23, even if the medical instrument is bent, the deformation of the valve portion 11 is restricted. Further, at the time of bending, the rear side of the cylindrical portion 28 is tapered, and the elasticity is smaller toward the rear end, so that the cylindrical portion 28 flexibly follows the bending of the medical device.

Next, effects of the third embodiment will be described. In the third embodiment, similarly to the effect of the second embodiment, since the valve portion is externally fitted due to the rigid valve not being attached, the deformation of the valve portion is restricted and the valve portion is inserted. Even if the rear part of the valve part of the medical instrument is bent, the stress due to the bending is hard to be transmitted to the valve part, and the liquid tightness and air tightness before and after the valve part can be precisely secured.

Further, since the rear portion of the cylindrical portion is tapered, it is easy to follow the curve of the medical device, and no excessive resistance is applied to the medical device, so that the medical device can be prevented from being damaged. .

In the above embodiment, a circular hole is formed in the valve portion. However, the present invention is not limited to the circular hole, and the valve portion may be formed in a slit shape. One or more breaks may be provided. The cut may be a simple streak or a complicated shape.

Further, when the above-mentioned cut is adopted in the embodiment, the liquid-tightness and air-tightness before and after the valve portion can be ensured even when the medical instrument is not inserted. Further, in the third embodiment, the rear side of the cylindrical portion is tapered, and the elasticity increases toward the rear side. However, the elasticity of the material forming the rear side of the cylindrical portion is higher than that of the material forming the front side. The elasticity may be larger at the rear part of the tubular part than at the front part.

Further, the present invention includes the inventions listed below. (Supplementary note) (Supplementary note 1) In a valve device for a medical instrument in which a medical instrument is inserted, one valve section that is in close contact with the outer surface of the medical instrument, and the medical instrument is curved by protruding rearward from the valve section. A medical device valve device, wherein the rear end portion is formed of an elastic projection that contacts the outer surface of the medical device and regulates the curvature of the medical device. (Supplementary Note 2) The protruding portion is formed in a cylindrical shape having an inner diameter slightly larger than the outer diameter of the medical device and a sufficient length in the longitudinal axis direction relative to the outer diameter of the medical device. 3. The valve device for a medical instrument according to claim 1, wherein (Supplementary note 3) The valve device for a medical instrument according to Supplementary note 1 or 2, wherein a rear portion of the protruding portion is formed to have greater elasticity than a front portion. (Supplementary note 4) The valve device for a medical instrument according to supplementary note 2 or 3, wherein the thickness of the protruding portion changes to be thinner toward a rear end.

[0035]

According to the present invention, in a valve device for a medical instrument, even if the base end side of the inserted medical instrument is curved, airtightness and liquid tightness can be maintained, and operability can be improved. Good and easy to clean.

[Brief description of the drawings]

FIG. 1 is a sectional view of a valve device.

FIG. 2 is a view showing a state in which the proximal end side of the treatment tool inserted into the valve device is curved.

FIG. 3 is a sectional view of a valve device.

FIG. 4 is a cross-sectional view of the valve device.

[Explanation of symbols]

 7 Valve member 11 Valve part 12 Circular hole 14 Cylindrical part 17 Ring 27 Valve member 28 Cylindrical part

Claims (3)

[Claims] 1. A medical device valve device for inserting a medical device, comprising: a valve portion that is in close contact with an outer surface of the medical device; and a valve that projects rearward from the valve portion and curves the medical device. A valve device for a medical device, wherein a rear end portion is formed from an elastic protrusion that contacts an outer surface of the medical device and regulates a curvature of the medical device. 2. The projecting portion is formed in a cylindrical shape having an inner diameter slightly larger than an outer diameter of the medical device and a sufficient length in a longitudinal axis direction relative to an outer diameter of the medical device. The valve device for a medical instrument according to claim 1, wherein 3. The medical device valve device according to claim 1, wherein the projecting portion has a rear portion formed with greater elasticity than a front portion.