JP2006262918A - Subordinate water feeding device of endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a subordinate water feeding device of an endoscope in which a check valve unit can be inserted into a check valve unit attaching hole and easily attached without damaging an O ring for sealing mounted on the body part of the check valve unit. <P>SOLUTION: The axial direction length (A) of the body part 11a at a part near a distal end from the O ring attaching groove 16 of the check valve unit 10 to be fitted in the check valve unit attaching hole 7 is formed to be longer than the axial direction length (B) of a female screw part 8 formed at the mouth part of the check valve unit attaching hole 7. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an auxiliary water supply device for an endoscope.

Some endoscopes are provided with a sub-water supply pipe for ejecting water vigorously (so-called jetting) in order to wash dirt and the like attached to the inner wall of the body cavity. In such a case, a check valve unit mounting hole is formed at the base end of the auxiliary water supply pipe, and a check valve unit having a check valve body for preventing a back flow of fluid from the distal end side of the insertion portion is provided. It is attached to the check valve unit mounting hole so that it can be inserted and removed from the outside (for example, Patent Document 1).
JP-A-8-238214

  FIG. 5 shows a state when the conventional check valve unit 90 is mounted in the check valve unit mounting hole 80, and the check valve is provided at the proximal end of the auxiliary water supply pipe that opens at the distal end of the insertion portion of the endoscope. A unit mounting hole 80 is formed, and a female screw portion 81 for screwing and fixing the check valve unit 90 is formed at the mouth of the check valve unit mounting hole 80.

  In the check valve unit 90, a check valve body 92 is attached to a portion closer to the front end of the body portion 91, and a portion closer to the handle 93 on the proximal side of the body portion 91 is provided in the check valve unit mounting hole 80. An O-ring 94 that is crushed and sealed against the peripheral surface is attached.

  However, in such a conventional endoscope secondary water supply device, when the check valve unit 90 is inserted into the check valve unit mounting hole 80, extreme care is taken to prevent the check valve unit 90 from tilting. Otherwise, as shown in FIG. 5, the O-ring 94 is caught by the mouth edge portion of the female screw portion 81 and is damaged. As a result, the sealing function of the O-ring 94 is lowered, and the in-vivo sewage or the like flows backward from the portion. May leak out.

  Therefore, according to the present invention, when the check valve unit is inserted into the check valve unit mounting hole and attached, the seal O-ring attached to the body of the check valve unit is easily attached without being damaged. It is an object to provide an auxiliary water supply device for an endoscope.

  In order to achieve the above-described object, the endoscope secondary water feeding device according to the present invention has a check valve unit attachment hole formed at the proximal end of the secondary water feeding pipe that opens at the distal end of the insertion portion of the endoscope. The body of the check valve unit having a check valve body for preventing the backflow of fluid from the tip side is removably inserted into the check valve unit mounting hole from the outside, and the body of the check valve unit is inserted. An O-ring for crushing and sealing between the inner peripheral surface of the check valve unit mounting hole is mounted in the O-ring mounting groove formed in the part, and formed at the mouth of the check valve unit mounting hole In the endoscope secondary water supply device configured to be screwed into the female screw portion formed on the body portion of the check valve unit, the reverse fitting that fits into the check valve unit mounting hole is provided. The shaft of the body part closer to the tip than the O-ring mounting groove of the stop valve unit Direction length of (A), is obtained by from greater axial length of the female threaded portion formed on the mouth portion of the check valve unit mounting holes (B).

  According to the present invention, the axial length of the trunk portion of the check valve unit closer to the tip than the O-ring mounting groove is set to the axial length of the female screw portion formed at the mouth portion of the check valve unit mounting hole. When the check valve unit is inserted into the check valve unit mounting hole and installed, the body part fits into the check valve unit mounting hole before the O-ring reaches the mouth of the female thread. As a result, the check valve unit becomes almost straight in the axial direction of the check valve unit mounting hole and the O-ring does not touch the female thread portion. The check valve unit can be easily attached to the check valve unit mounting hole without damaging the sealing O-ring.

  A non-return valve having a non-return valve body for preventing a reverse flow of fluid from the distal end side of the insertion part, wherein a check valve unit mounting hole is formed at the proximal end of the auxiliary water supply pipe opened at the distal end of the insertion part of the endoscope The body of the valve unit is removably inserted into the check valve unit mounting hole from the outside, and the inner periphery of the check valve unit mounting hole is inserted into the O-ring mounting groove formed in the body of the check valve unit. An O-ring for crushing and sealing between the surface and a female screw part formed at the mouth part of the check valve unit mounting hole and a male screw part formed at the body part of the check valve unit In the endoscope secondary water feeding device configured to be screwed together, the axial length of the trunk portion of the portion closer to the tip than the O-ring mounting groove of the check valve unit fitting with the check valve unit mounting hole A is formed at the mouth of the check valve unit mounting hole. It was formed larger than the axial length B of the female threaded portion.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows the overall configuration of the endoscope. An operation unit 2 is connected to a proximal end of a flexible tubular insertion unit 1, and a connector unit 3 connected to a light source device (not shown) is attached to the distal end. The connecting flexible tube 4 extends backward from the operation unit 2.

  And the check valve unit attachment part 6 provided in the base end of the sub-water-feed pipe 5 opened at the front-end | tip of the insertion part 1 is arrange | positioned at the side part of the connector part 3, A check valve unit 10 for preventing the fluid from flowing backward via the water supply pipe 5 is detachably attached to the check valve unit attachment portion 6. Note that the check valve unit attachment portion 6 may be disposed in the operation portion 2.

  FIG. 3 shows the check valve unit mounting portion 6 and the check valve unit 10, and the main body member 11 of the check valve unit 10 is a stepped cylindrical body in which a through hole is formed at the axial position. A cylindrical body 11a having a constant outer diameter is formed at the intermediate portion.

  A fluid passage hole 12 is formed in a portion of the check valve unit 10 near the tip of the main body member 11 so as to penetrate the side wall in a direction perpendicular to the axis, and is elastic in a state of wrapping the portion. A check valve body 13 made of a rubber material is attached.

  In the check valve unit mounting portion 6, a check valve unit mounting hole 7 in which the check valve body 13 and the body portion 11 a of such a check valve unit 10 are accommodated is formed at the base end of the auxiliary water supply pipe 5. The internal thread portion 8 is formed in the mouth portion of the check valve unit mounting hole 7.

  A knob 15 is attached to the proximal end of the main body member 11 of the check valve unit 10, and a male screw part 14 screwed into the female screw part 8 on the check valve unit attachment part 6 side is provided on the knob 15. It is formed in the outer peripheral part of the main body member 11 so as to be located inside, and an O-ring mounting groove 16 formed in the outer peripheral part of the main body member 11 at a position between the male screw part 14 and the body part 11a is used for sealing. The O-ring 17 is fitted.

  The O-ring 17 is formed of an elastic rubber material or the like. When the O-ring 17 is mounted in the O-ring mounting groove 16, the outer diameter is larger than the diameter of the check valve unit mounting hole 7 and the inner diameter of the female screw portion 8. Smaller dimensions are formed.

  When the check valve unit 10 is attached to the check valve unit mounting portion 6 and the male screw portion 14 is screwed with the female screw portion 8, the body portion 11a is fitted into the check valve unit mounting hole 7. Then, the O-ring 17 is crushed by the inner peripheral surface of the check valve unit mounting hole 7, so that the portion is hermetically sealed.

  Then, the connector 20 of the water injection device can be detachably inserted and connected to the main body member 11 from the outside, and water can be injected into the auxiliary water supply pipe 5. When the connector 20 is not attached, the check valve unit 10 is attached. The check valve unit 10 can be securely sealed by attaching the sealing lid 9 instead.

  In the check valve unit 10 configured as described above, as shown in FIG. 4, the axial direction length of the body 11 a (strictly speaking, the axis of the body 11 a closer to the tip than the O-ring mounting groove 16 is provided. (Direction length) A is formed larger than the axial length B of the female thread portion 8 of the check valve unit mounting portion 6. That is, A> B.

  As a result, as shown in FIG. 1, when the check valve unit 10 is inserted into the female threaded portion 8 of the check valve unit mounting portion 6, the O-ring 17 is formed before the mouth of the female threaded portion 8 reaches the mouth. The portion 11a is fitted into the check valve unit mounting hole 7, and the check valve unit 10 is almost straight in the axial direction of the check valve unit mounting hole 7, so that the O-ring 17 does not touch the female screw portion 8. As a result, the O-ring 17 does not get caught by the female threaded portion 8 and is not damaged even if attention is not paid to the inclination of the check valve unit 10. It can be easily attached to the check valve unit attachment portion 6.

It is side surface sectional drawing of the state in the middle of the check valve unit of the Example of this invention being attached to a check valve unit attachment part. 1 is a side view showing an overall configuration of an endoscope according to an embodiment of the present invention. It is side surface sectional drawing of the auxiliary water supply apparatus of the endoscope of the Example of this invention. It is side surface partial sectional drawing of the state from which the non-return valve unit of the Example of this invention was removed from the non-return valve unit attachment part. It is side surface partial sectional drawing of the state in the middle of the conventional check valve unit being attached to the check valve unit attachment hole.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insertion part 5 Sub-water supply pipe 6 Check valve unit attachment part 7 Check valve unit attachment hole 8 Female thread part 10 Check valve unit 11a Body 13 Check valve body 14 Male thread part 16 O-ring attachment groove 17 O-ring A Length in the axial direction of the body portion closer to the tip than the O-ring mounting groove of the check valve unit B Length in the axial direction of the female screw portion formed in the mouth portion of the check valve unit mounting hole

Claims (1)

A check valve unit mounting hole is formed at the base end of the auxiliary water pipe that opens at the distal end of the insertion portion of the endoscope, and the check valve body has a check valve body for preventing the backflow of fluid from the distal end side of the insertion portion. The body portion of the check valve unit is removably inserted into the check valve unit mounting hole from the outside, and the check valve unit is mounted in the O-ring mounting groove formed in the body portion of the check valve unit. An O-ring for sealing by being crushed between the inner peripheral surface of the hole is mounted, and a female screw portion formed at the mouth portion of the check valve unit mounting hole and a body portion of the check valve unit In the auxiliary water feeding device of the endoscope configured to be screwed with the formed male screw portion,
The axial length (A) of the trunk portion of the check valve unit that fits into the check valve unit mounting hole and closer to the tip than the O-ring mounting groove is the mouth of the check valve unit mounting hole. An auxiliary water supply device for an endoscope, characterized in that it is formed to be larger than the axial length (B) of the female screw portion formed in the portion.

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