JP3380045B2 - Connection structure of fluid line of endoscope - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure for a fluid conduit of an endoscope. 2. Description of the Related Art FIG. 8 shows a connection structure of a conventional fluid line of an endoscope described in Japanese Patent Application Laid-Open No. 2-128828, in which two forceps channels 11 and 12 and two forceps channels 11 and 12 are provided. A suction pipe switching mechanism 13 for selectively connecting a suction connection pipe 41 attached to the tip of a suction tube 40 to forceps insertion passages 31 and 32 for communicating with forceps insertion mouthpieces 29 and 30. is there. In the suction line switching mechanism 13, two forceps insertion passages 31 and 32 are formed in a pedestal 25 fixed to the outer cover 21. Connection caps 35, 35 are fixed to the ends of the channel connection pipes 11a, 12a attached to the base ends of the forceps channels 11, 12, respectively, and the connection caps 35, 35 are attached to the pedestal 25.
It is inserted and connected to the openings of the forceps insertion passages 31 and 32 at the lower end. Reference numeral 33 denotes an O-ring for sealing mounted on each of the connection bases 35, 35. A flange-shaped connection base 42 is fixed to an end of the suction connection pipe 41 attached to the tip of the suction tube 40. And the connection base 42
A screw 43 screwed into the base draws the connection base 42 from the inside of the pedestal 25 and fixes it to the pedestal 25. 44 is an O-ring for sealing. [0004] As shown in FIG. 8, it is necessary to screw the connection base 42 into the pedestal 25 by screwing the connection screw 42. It is necessary to rotate the priming screw 43 from inside the pedestal 25. Therefore, conventionally, as shown in FIG.
An engagement groove 43b for engaging a driver-like tool is formed in the head of the screw 43, and the tip of the tool inserted into the pedestal 25 is engaged therewith.
Was rotating. However, when such an engagement groove 43b is formed in the head of the screw 43, the waste liquid sucked toward the suction tube 40 through the communication passage 43a in the screw 43 is formed. Accumulate inside. Moreover, since the inside of the engagement groove 43b cannot be cleaned with a cleaning brush or the like, if the waste liquid contains malignant bacteria, virus, etc., there is a risk of causing infection between patients through the mixture. there were. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sanitary endoscope fluid line connection structure which eliminates a portion where fluid easily accumulates at a connection portion of the fluid line and which does not cause infection between patients. And [0009] In order to achieve the above object, a connection structure for a fluid conduit of an endoscope according to the present invention comprises a mouth opening of a connection base attached to an end of the connection tube. In the connection structure for a fluid conduit of an endoscope, a connection screw communicating with the connection pipe is formed by screwing a connection screw formed therethrough so as to draw and fix the connection base. The mouth portion of the communication passage formed in the screw is formed to have a non-circular cross-sectional shape that engages with a tightening tool. An embodiment will be described with reference to the drawings. In FIG. 2, a suction operation valve 3 and an air / water supply operation valve 4 are arranged side by side at an upper front part of a grip part 2 of an operation part 1 of the endoscope, and a bending operation knob 5 is arranged at a right side part. Have been. Reference numeral 6 denotes an eyepiece, and reference numeral 7 denotes a suction connection pipe connected to a suction device (not shown). Reference numeral 8 denotes a flexible insertion portion.
In the connecting portion 20 between the and the operating portion 1, two forceps insertion openings 9, 10 for inserting a treatment tool such as forceps are formed so as to be closely arranged and slightly inclined forward to protrude. The two forceps channels 11 and 12 inserted into the insertion portion 8 are connected to the forceps insertion ports 9 and 10, respectively. Reference numeral 13 denotes two forceps channels 11 and 12
Is a suction line switching mechanism for selectively communicating one or both of them with the suction device via the suction connection pipe 7 and the like, and is integrally provided immediately below the forceps insertion ports 9 and 10. I have. On the front surface, an operation knob 14 for switching the suction pipe line switching mechanism 13 is rotatably protruded. FIG. 1 is a side sectional view of the connecting portion 20, and FIG. 3 is a plan sectional view. In the figure, reference numeral 15 denotes a frame of the operation unit 1, and the connecting portion 20 has an upper half covered with a first exterior cover 21 and a lower half covered with a second exterior cover 22.
It is exterior. The joint between the two exterior covers 21 and 22 is connected in a watertight manner by a joint pipe 24 to which a sealing O-ring 23 is attached. The forwardly inclined projection 21a of the first exterior cover 21
A pedestal 25 serving as a base for both the suction line switching mechanism 13 and the forceps insertion ports 9 and 10 is disposed therein. 26 is an O-ring for sealing, and 27 is a cover member made of an elastic rubber material or the like. The pedestal 25 has two forceps insertion bases 29,
30 is screwed from above, and the forceps insertion ports 9 and 10 communicate with the forceps channels 11 and 12 via two forceps insertion passages 31 and 32 penetrated through the pedestal 25. ing. 11a and 12a are forceps channels 1
These are metal channel connecting tubes connected to the ends of the forceps 1 and 12, and are watertightly connected to the ends of the forceps insertion passages 31 and 32 by a connection base 35 to which an O-ring 33 is attached. In FIG. 1, different cross sections are shown in a composite manner, so that the forceps insertion passages 31 and 32 appear to be closed halfway.
Penetrates the pedestal 25 as shown in FIG. 4 showing an IV-IV cross section. As shown in FIG. 4 and FIG. 5 showing the arrow V, the connection base 35 is a single plate-like member formed in an oblong shape, and has two channel connection pipes 11a and 12a.
Are fixedly connected by silver brazing or the like. Then, the connection base 35 is fitted into the pedestal 25 so that there is no gap, and is firmly pressed against the pedestal 25 by a fixing screw 36 and fixed by screws. Therefore, there is no concave portion in which the waste liquid accumulates in the channel portion connected by the connection base 35. The O-ring 33 attached to the outer peripheral surface of the connection base 35 seals the fitting surface between the base 25 and the O-ring 33, thereby providing the two forceps insertion passages 31, 32.
The leak between the outside and the outside is prevented. The operation knob 14 is provided at the center of the pedestal 25.
Is rotatably fitted to the switching valve 37 which is directly connected to the valve.
The cross-sectional shape of the fitting portion between the operation knob 14 and the switching valve 37 is non-circular, and they are fixed to each other by fixing screws 47. The concave portion of the head of the fixing screw 47 is filled with an adhesive. 38 is an O-ring for sealing. A communication groove 39 formed in the bottom of the switching valve 37
Is connected to the suction operation valve 3 via the suction tube 40. Reference numeral 41 denotes a suction connection pipe connected to the tip of a suction tube 40 connected to the suction operation valve 3. A flange-shaped connection base 42 having a large diameter is attached to an end of the suction connection pipe 41 by silver brazing or soldering. The priming screw 43 is screwed into the female screw formed at the base of the connection base 42 from the inside of the pedestal 25, and draws the connection base 42 toward the pedestal 25 and fixes it. Tube 40 and suction connection tube 4
1 communicates with the forceps insertion passages 31 and 32 in the pedestal 25. The attracting screw 43 is formed to have a large diameter so that the head fitting into the pedestal 25 does not come out of the pedestal 25 to the connection base 42 side. A communication passage 43a communicating with the pipe 41 is formed so as to penetrate in the axial direction. O-rings 44 and 45 for sealing are respectively mounted on the fitting surface of the outer periphery of the receiving screw 43 with the connection base 42 and the fitting surface with the base 25. As shown in FIG. 6, the mouth of the communication passage 43a is formed in a slot-like cross section at the head-side end of the priming screw 43 located in the pedestal 25.
Then, when screwing the screw 43 into the connection base 42, as shown in FIG. 7, the tip of the tool 100 is inserted into the pedestal 25 and engaged with the elongated hole 43 c, and the tool 100 is rotated. If so, the prime screw 43
Is rotated and screwed into the connection base 42, and the connection base 42 is attracted to the pedestal 25 side and fixed. As described above, the slot 4 of the prime screw 43
Since the portion 3c may be rotated by engaging the tool 100, the cross-sectional shape is not necessarily an elliptical shape, but may be a non-circular shape that can be engaged with the tip of the tool 100 and transmit the rotational force. The boundary between the long hole portion 43c having an oval cross section and the communication passage 43a having a circular shape is formed with a smooth slope so as to prevent a step from being formed. It is easy to do. As shown in FIG. 4, the pedestal 25 has a communication groove 39 at the bottom of the switching valve 37 and both forceps insertion passages 31, 32.
Are formed, and by switching the switching valve 37, the suction tube 40
(That is, the communication between the suction operation valve 3 and the forceps channels 11 and 12) can be changed. In the present embodiment, the switching valve 37 is notched at two locations symmetrically in a fan shape. In the state shown in FIG. 4, the two forceps channels 11 and 12 are both connected to the suction operation valve 3. ing. And if the switching valve 37 is rotated,
Only one of the forceps channels 11 and 12 can communicate with the suction operation valve 3. Returning to FIG. 1, reference numeral 51 denotes a fixing member fixed to the pedestal 25 by a fixing screw 52. The fixing member 51 is fitted into the hole formed in the wall of the outer cover 21 from the outside, and is fixed thereto. It is fixed to the inner pedestal 25. Therefore, when the fixing member 51 is fixed to the pedestal 25 by the fixing screw 52, they are simultaneously fixed to the exterior cover 21. A plurality of sealing O-rings are also mounted on this fixed portion. The switching valve 37 has a click spring 54 fixed with a screw 49 and a click ball 5 urged by the click spring 54 toward the uneven surface of the fixing member 51.
5, the switching valve 37 can be stopped at an optimum position for switching the suction line. Reference numeral 56 denotes a plastic cover for covering the click portion, and a metal cover 57 screwed inside thereof is detachably mounted on the fixing member 51 by a C-shaped snap ring 58. I have. In the embodiment apparatus constructed as described above, the switching valve 37 is rotated by rotating the operation knob 14, and one or both of the two forceps channels 11, 12 are selectively operated. It can communicate with the suction operation valve 3. When the suction operation valve 3 is operated there, the forceps channel 1 which communicates with the suction operation valve 3 is formed.
Suction is performed through 1 and 12. The present invention is not limited to the above-described embodiment. For example, the present invention is not limited to the suction flow path of the endoscope, but may be applied to a flow path such as air supply or water supply. According to the present invention, the base of the communication passage formed in the inlet screw for drawing and fixing the connection base is formed in a non-circular cross-sectional shape, so that a fastening tool is provided there. Can be engaged from the inside of the connection part, the prime screw can be rotated, and the connection base can be pulled and fixed. Therefore, it is not necessary to form a recess in which the waste liquid accumulates in the tool engaging portion of the screw, and if the cleaning brush is passed, the engaging portion can be easily brushed and cleaned. It is possible to effectively prevent infection between patients due to residual waste fluid.

[Brief description of the drawings] FIG. 1 is a side sectional view of an embodiment. FIG. 2 is a perspective view of the embodiment. FIG. 3 is a plan sectional view of the embodiment. FIG. 4 is a sectional view taken along line IV-IV of the embodiment. FIG. 5 is a view as seen from an arrow V in the embodiment. FIG. 6 is a perspective view of a prime screw according to the embodiment. FIG. 7 is a side sectional view of the embodiment during assembly. FIG. 8 is a side sectional view of a conventional example. FIG. 9 is a perspective view of a conventional set screw. [Explanation of symbols] 41 Suction connection pipe 42 Connection base 43 Inlet screw 43a Connecting passage 43c long hole (mouth)

Claims (1)

(57) [Claim 1] A priming screw formed by penetrating a communication passage communicating with the connection pipe at a mouth opening of a connection base attached to an end of the connection pipe. In the connection structure of the fluid conduit of the endoscope, wherein the connection base is drawn and fixed, the mouth portion of the communication passage formed in the inlet screw is engaged with a tightening tool by a non-circular shape. A connection structure for a fluid conduit of an endoscope, wherein the connection structure has a cross-sectional shape of.