JP4671283B2 - Child endoscope insertion aid in a parent-child endoscope system - Google Patents

Description

  The present invention relates to a parent-child type in which an insertion portion of a child endoscope is inserted into an insertion passage of the parent endoscope, and a distal end of the insertion portion of the child endoscope is protruded from the distal end of the insertion portion of the parent endoscope. The present invention relates to a child endoscope insertion assisting tool that is attached to the entrance-side opening of the insertion conduit in the endoscope system.

About the parent-child endoscope system that inserts the insertion part of the child endoscope into the insertion line for the parent endoscope and projects the distal end of the insertion part of the child endoscope from the distal end of the insertion part of the parent endoscope Is described in Patent Document 1, for example.
In the invention of Patent Document 1, one end of a child endoscope insertion assisting tool is attached to the opening on the entrance side of the insertion line of the parent endoscope, and the child endoscope is inserted from the other end of the child endoscope insertion assisting tool. The insertion portion of the child endoscope is protruded to the outside from the distal end surface of the insertion portion of the parent endoscope through the insertion pipe of the parent endoscope.

  The child endoscope insertion aid includes a large-diameter cylindrical body and a small-diameter cylindrical body that is smaller in diameter than the large-diameter cylindrical body and is slidably fitted into the large-diameter cylindrical body. The distal end portion of the small-diameter cylindrical body is connected to the parent endoscope, and the insertion portion of the child endoscope is inserted into the large-diameter cylindrical body and the internal duct of the small-diameter cylindrical body from the proximal end side opening of the large-diameter cylindrical body. Is inserted. And it is possible to change the full length of the child endoscope insertion aid by relatively sliding the large diameter cylindrical body and the small diameter cylindrical body.

JP 11-313794 A

However, in the invention of Patent Document 1, since a gap through which gas can flow is formed between the large-diameter cylindrical body and the small-diameter cylindrical body, air is fed into the body cavity from the child endoscope or the parent endoscope. There was a risk that part of the air would flow backward and leak outside (outside the body) from this gap. If air leaks in this way, observation inside the body cavity cannot be performed accurately.
Further, since a gap is also formed between the proximal end opening of the large-diameter cylindrical body and the child endoscope, there is a possibility that part of the air supplied into the body cavity also leaks from this gap. .

  Furthermore, when the pressure in the body cavity becomes higher than necessary, the observation inside the body cavity cannot be performed accurately, but the function of preventing the pressure in the body cavity from becoming higher than necessary in conventional child endoscope insertion aids. There was no.

  An object of the present invention is to prevent the air in the body cavity from flowing backward and leak outside the body, and further to prevent the atmospheric pressure in the body cavity from becoming higher than necessary, thereby enabling accurate observation in the body cavity. Another object of the present invention is to provide a child endoscope insertion aid in the parent-child endoscope system.

The child endoscope insertion assisting tool in the parent-child endoscope system of the present invention is inserted into the opening on the inlet side of the insertion pipe when the insertion portion of the child endoscope is inserted into the insertion pipe of the parent endoscope. In a child endoscope insertion aid to be mounted, a telescopic cylindrical body having a large-diameter cylindrical body and a small-diameter cylindrical body coupled so as to be relatively slidable, and one outer end portion of the telescopic cylindrical body The tube interposed between the inlet-side opening formed on the inlet side and the inlet end formed on the other outer end, and the cylindrical sliding surface of the small-diameter cylindrical body and large-diameter cylindrical body The gas between the inner pipe and the outer space is normally provided in an O-ring that holds the sliding surface airtight and a communication pipe that communicates the inner pipe of the telescopic cylindrical body and the outer space thereof. And a check valve mechanism that allows gas to flow out from the internal pipe line to the external space when the atmospheric pressure in the internal pipe line exceeds a predetermined value. The valve stop mechanism slides in an airtight state on the inner surface of the communication pipe, and is normally positioned on the inlet side opening side communicating with the internal pipe line from the outlet side opening communicating with the external space of the communication pipe line. A sliding valve that blocks a gas flow between the internal pipe line and the external space, and urges the sliding valve to be positioned closer to the inlet side opening side than the outlet side opening. when the pressure exceeds the predetermined value, as characterized by comprising a biasing means for the sliding valve is allowed to open the outlet side opening moves beyond the outlet opening by the pressure Yes.

  A cylindrical body whose inner peripheral surface is in airtight contact with the outer peripheral surface of the child endoscope and is fitted to the inlet end of the telescopic cylindrical body, and the outer peripheral surface of the cylindrical body and the telescopic It is preferable to include an O-ring that holds an airtight space between the inner peripheral surface of the inlet side end portion of the cylindrical body.

  The urging means can be constituted by a tension spring, for example.

  ADVANTAGE OF THE INVENTION According to this invention, even if the air in a body cavity flows backward to the child endoscope insertion auxiliary tool side, it is prevented from leaking out of the body from the child endoscope insertion auxiliary tool. Furthermore, since it is possible to prevent the atmospheric pressure in the body cavity from becoming higher than necessary, observation in the body cavity can be performed accurately.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
First, as shown in FIG. 1, a parent-child endoscope system 100 to which the present invention is applied includes a parent endoscope 20, a child endoscope 30, and a child endoscope insertion aid 40 as major components. Yes.
As is well known, the parent endoscope 20 includes an operation unit 21, an insertion unit 22, and a connecting unit 23 that connects the operation unit 21 and the insertion unit 22. A treatment instrument insertion channel (insertion conduit) 24 is formed inside the coupling part 23 and the insertion part 22, and the distal end opening of the treatment instrument insertion channel 24 is formed on the distal end surface (not shown) of the insertion part 22. ing. Further, a connecting end portion 25 that forms an entrance-side opening of the treatment instrument insertion channel 24 is formed in the connecting portion 23 of the parent endoscope 20, and a male screw (not shown) is provided on the peripheral surface of the connecting end portion 25. Is formed.
As is well known, the child endoscope 30 includes an operation unit 31, an insertion unit 32, and a connection unit 33 that connects the operation unit 31 and the insertion unit 32, and a treatment instrument insertion channel (shown in the figure). Abbreviation) is formed.

The child endoscope insertion assisting tool 40 is mainly composed of a small-diameter cylindrical body (expandable cylindrical body) 41, a large-diameter cylindrical body (expandable cylindrical body) 45, a cylindrical body 65, and a fastening ring. 73 and a fastening ring 76 are provided.
The small-diameter cylindrical body 41 is a cylindrical body integrally formed of synthetic resin, and both ends thereof are open. A connection base 43 having a female screw hole 42 formed on the inner peripheral side is integrally fixed to the distal end portion of the small-diameter cylindrical body 41. When the female screw hole 42 of the connection base 43 is screwed into the male screw of the connection end 25, the connection base 43 is fixed to the connection end 25, and the connection end 25 and the small-diameter cylindrical body 41 communicate with each other. Further, as shown in FIG. 8, an annular recess 44 is formed in the vicinity of the rear end portion of the outer peripheral surface of the small-diameter cylindrical body 41, and an O-ring OL1 is fitted and fixed in an airtight state in the annular recess 44. ing.

  The large-diameter cylindrical body 45 is a cylindrical body integrally formed of synthetic resin, and both ends thereof are open. The inner pipe line of the large diameter cylindrical body 45 is larger in diameter than the outer diameter of the small diameter cylindrical body 41. Four slits 47 are formed in the distal end portion 46 of the large-diameter cylindrical body 45 at intervals of 90 ° in the circumferential direction, and the distal end portion 46 can be elastically deformed in the radial direction. A male screw 48 adjacent to the tip 46 is formed on the outer peripheral surface of the large-diameter cylindrical body 45. Four slits 50 are formed in the rear end portion 49 of the large-diameter cylindrical body 45 at intervals of 90 ° in the circumferential direction, and the rear end portion 49 can be elastically deformed in the radial direction. A male screw 51 adjacent to the rear end portion 49 is formed on the outer peripheral surface of the large-diameter cylindrical body 45. Furthermore, the internal thread 52 is provided in the internal peripheral surface of the rear-end part 49 (refer FIG. 9).

As shown in FIG. 9, the inner pipe line of the large-diameter cylindrical body 45 has the largest diameter portion 53 having the largest diameter and the rearmost position, and an intermediate diameter adjacent to the largest diameter portion 53 and having a smaller diameter than the largest diameter portion 53. The portion 54 and the smallest diameter portion 55 having the smallest diameter extending from the front end portion of the intermediate diameter portion 54 to the front end of the large diameter cylindrical body 45. As shown in FIG. 9, the rear end portion 56 of the large-diameter cylindrical body 45 is larger in diameter and thicker than the front portion thereof. A pair of linear flow paths (communication pipe lines) 58 are formed in the rear end portion 56 at intervals of 180 ° in the circumferential direction. The pair of linear flow paths 58 are both parallel to the axis of the large diameter cylindrical body 45. Between the vicinity of the rear end portion of the linear flow path 58 and the minimum diameter portion 55, an internal communication path (communication pipe line) (inlet side opening) 59 is formed to face the radial direction of the large diameter cylindrical body 45. Between the vicinity of the front end portion of the straight flow path 58 and the outer peripheral surface of the rear end portion 56, an external communication path (communication pipe line) (exit side opening) 60 is formed that faces the radial direction of the large-diameter cylindrical body 45. Yes. That is, the internal space and the external space of the large-diameter cylindrical body 45 communicate with each other through the internal communication path 59, the linear flow path 58, and the external communication path 60. Inside the linear flow path 58, a sliding valve 62 that is slidably contacted with the inner peripheral surface of the linear flow path 58 in an airtight state is housed slidably. Furthermore, the front and rear ends of the tension spring (biasing means) S are fixed to the rear surface of the sliding valve 62 and the rear end surface of the linear flow path 58, respectively. Always urged to move backwards. For this reason, as shown in the upper half of FIG. 9, the sliding valve 62 is always positioned behind the external communication path 60, and therefore, the gas in the internal pipe of the large-diameter cylindrical body 45 is outside the external communication path 60. From the large-diameter cylindrical body 45 to the outside. However, when the atmospheric pressure in the internal space of the large-diameter cylindrical body 45 exceeds a predetermined value determined by the spring constant of the tension spring S, the sliding resistance of the sliding valve 62 and the linear flow path 58, etc., the atmospheric pressure (air pressure) is increased. The sliding valve 62 is biased forward against the biasing force of the tension spring S, and the sliding valve 62 moves forward from the external communication path 60 as shown in the lower half of FIG. Therefore, the gas in the internal pipe line of the large diameter cylindrical body 45 can flow out of the large diameter cylindrical body 45 through the internal communication path 59, the linear flow path 58, and the external communication path 60.
The straight flow path 58, the internal communication path 59, the external communication path 60, the sliding valve 62, and the tension spring S are components of the check valve mechanism.

When the cylindrical body 65 is inserted into the rear end opening of the large-diameter cylindrical body 45, the front-end small-diameter portion 66 that fits into the intermediate-diameter portion 54 and the rear-end large-diameter portion 67 that fits into the maximum-diameter portion 53. And an abutting portion 68 which is continuous with the rear end of the rear end large diameter portion 67 and has a diameter larger than the inner diameter of the maximum diameter portion 53. A male screw 63 that can be screwed with the female screw 52 of the large-diameter cylindrical body 45 is formed on the outer peripheral surface of the rear end large-diameter portion 67 (see FIG. 9). When the male screw 63 is screwed into the female screw 52, The cylindrical body 65 is fitted and fixed to the large-diameter cylindrical body 45, and the front surface of the contact portion 68 contacts the rear end surface of the large-diameter cylindrical body 45. Inside the cylindrical body 65, an internal conduit 69 having both ends opened over its entire length is formed. Further, an O-ring OL2 is fitted in an airtight state in an annular recess 70 provided in the outer peripheral surface of the front end small-diameter portion 66.
The tightening ring 73 is a cylindrical body that can be fitted onto the rear end portion of the large-diameter cylindrical body 45 and the vicinity thereof, and a female screw hole 74 that can be screwed with the male screw 51 is formed on the inner peripheral surface thereof. When the female screw hole 74 of the tightening ring 73 is screwed into the male screw 51 in the tightening direction, the four rear end portions 49 are pressed inward, so that the O-ring OL2 is airtight on the inner peripheral surface of the intermediate diameter portion 54. Contact slidably.
The tightening ring 76 is a cylindrical body that is externally fitted to the distal end portion 46, and an internal thread hole 77 that can be screwed with the external thread 48 is formed on the inner peripheral surface thereof, and an annular contact portion 78 is formed on the inner peripheral surface. It is fixed. As shown in FIG. 8, with the rear end portion of the small-diameter cylindrical body 41 fitted into the distal end portion 46 of the large-diameter cylindrical body 45, the tightening ring 76 is externally fitted to the distal end portion 46 and the female screw hole 77. Is screwed into the male screw 48 in the tightening direction, the annular abutting portion 78 presses the tip portion 46 inward, so that the four tip portions 46 are elastically deformed inward. Then, the O-ring OL1 comes into slidable contact with the inner peripheral surface of the minimum diameter portion 55 in an airtight state. Furthermore, since the relative positions of the small-diameter cylindrical body 41 and the large-diameter cylindrical body 45 that can move relative to each other are fixed, the child endoscope insertion aid 40 is fixed to a desired length. However, since the frictional resistance force between the small-diameter cylindrical body 41 and the large-diameter cylindrical body 45 is not so large, one of the small-diameter cylindrical body 41 and the large-diameter cylindrical body 45 is pressed in the axial direction with a force exceeding this. Then, the small diameter cylindrical body 41 and the large diameter cylindrical body 45 move relative to each other in the axial direction, and the total length of the child endoscope insertion aid 40 changes.

  After the child endoscope insertion aid 40 is fixed to the child endoscope 30 in this way, the insertion portion 32 of the child endoscope 30 is connected to the large diameter tubular body 45 and the small diameter tube from the rear end opening of the tubular body 65. When inserted into the internal pipe line (intermediate diameter part 54, minimum diameter part 55...) Of the body 41, the insertion part 32 passes through the child endoscope insertion assisting tool 40 and the treatment tool is inserted into the parent endoscope 20. It enters the channel 24 and protrudes from the distal end opening of the treatment instrument insertion channel 24 formed on the distal end surface of the insertion portion 22 to the outside of the parent endoscope 20. Further, as shown in FIG. 9, the outer peripheral surface of the child endoscope 30 is in airtight contact with the inner conduit 69 of the rear end large diameter portion 67, so that the outer peripheral surface of the child endoscope 30 and the inner conduit 69 are Gas leakage from between is prevented.

  When the parent endoscope 20, the child endoscope 30, and the child endoscope insertion aid 40 are integrated as described above, the space between the connecting portions of the small diameter cylindrical body 41 and the large diameter cylindrical body 45 is the O-ring OL1. The airtight state is achieved by the action, and the space between the front end small-diameter portion 66 and the inner peripheral surface of the large-diameter cylindrical body 45 is made airtight by the action of the O-ring OL2, and the outer peripheral surface of the child endoscope 30 is airtightly sealed in the internal conduit 69 Since the contact is made in the state, the air in the internal duct of the child endoscope insertion assisting tool 40 does not leak to the outside of the child endoscope insertion assisting tool 40 between them. Therefore, the insertion part 22 of the parent endoscope 20 and the insertion part 32 of the child endoscope 30 are inserted into the body cavity of the subject, and air is supplied from the parent endoscope 20 or the child endoscope 30 into the body cavity. In addition, the air in the body cavity flows backward in the internal space of the parent endoscope 20, and this air flows between the connecting portions of the small-diameter cylindrical body 41 and the large-diameter cylindrical body 45, or the front-end small-diameter portion 66 and the large-diameter cylindrical shape. There is no leakage to the outside of the child endoscope insertion aid 40 between the inner peripheral surface of the body 45 or between the outer peripheral surface of the child endoscope 30 and the inner duct 69. Therefore, the surgeon includes in-vivo observation using the parent endoscope 20 and the child endoscope 30 (including treatment using a treatment tool inserted into the treatment tool insertion channel of the parent endoscope 20 and the child endoscope 30). ) Can be performed accurately.

  Furthermore, if the air pressure in the body cavity (in the child endoscope insertion aid 40) increases so as to affect the observation in the body cavity and exceeds the predetermined value, the sliding valve 62 resists the biasing force of the tension spring S. Since it moves forward beyond the external communication path 60, the air in the body cavity is discharged from the external communication path 60 to the outside of the child endoscope insertion aid 40. When the air pressure in the body cavity (within the child endoscope insertion aid 40) becomes equal to or less than the predetermined value by being discharged, the sliding valve 62 is again closed by the urging force of the tension spring S. fall back. Therefore, the atmospheric pressure in the body cavity is always maintained in a state where it is easy to observe the body cavity.

In the present embodiment described above, the parent endoscope 20 and the child endoscope 30 may be electronic endoscopes or scopes that are not electronic endoscopes.
Further, an annular recess 44 is provided on the inner peripheral surface of the large-diameter cylindrical body 45 to fit the O-ring OL1, or an annular recess 70 is provided on the inner peripheral surface of the large-diameter cylindrical body 45 to form an O. The ring OL2 may be fitted.
Further, the front end portion of the large-diameter cylindrical body 45 may be connected to the connection base 43 and the cylindrical body 65 may be attached to the rear end portion of the small-diameter cylindrical body 41.
Furthermore, the check valve mechanism may be provided on the small diameter cylindrical body 41 side, or the check valve mechanism may be provided on both the small diameter cylindrical body 41 side and the large diameter cylindrical body 45 side.
Further, instead of providing the tension spring S in the linear flow path 58, a compression spring (biasing means) is provided between the front end face of the linear flow path 58 and the front face of the slide valve 62 to move the slide valve 62 rearward. May be energized.
Furthermore, the uses of the parent endoscope 20, the child endoscope 30, and the child endoscope insertion aid 40 are not limited to medical use, and can be used for industrial purposes, for example.

It is a perspective view which shows a mode that the insertion part of the child endoscope was inserted in the internal channel of the parent endoscope using the child endoscope insertion auxiliary tool of the present invention. It is a perspective view of a child endoscope insertion aid. It is a side view which shows the state before fixing both when the insertion part of a child endoscope is inserted in the child endoscope insertion auxiliary tool. It is a side view which shows a mode that the insertion part of the child endoscope was inserted in the child endoscope insertion auxiliary tool, and both were fixed. It is a side view which isolate | separates a large diameter cylindrical body and a small diameter cylindrical body, and fracture | ruptures a part. It is a fragmentary sectional view of a clamp ring. It is a fragmentary sectional view of a clamp ring. FIG. 4 is an enlarged side view showing a connecting portion between a small-diameter cylindrical body and a large-diameter cylindrical body in cross-section, with the upper half showing when the tightening amount of the tightening ring is small and the lower half tightening the tightening ring Indicates when the amount is large. It is an enlarged side view showing a part of the main part of the large-diameter cylindrical body in a cross-sectional view, the upper half shows when the pressure in the internal pipeline is below a predetermined value, and the lower half shows the pressure in the internal pipeline Indicates when exceeds a predetermined value.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Parent-child endoscope system 20 Parent endoscope 21 Operation part 22 Insertion part 23 Connection part 24 Treatment instrument insertion channel (pipe for insertion)
25 Connection end (entrance side opening)
30 Child endoscope 31 Operation part 32 Insertion part 33 Connection part 40 Child endoscope insertion auxiliary tool 41 Small diameter cylindrical body (expandable cylindrical body)
42 female screw hole 43 connection base 44 annular recess 45 large-diameter cylindrical body (expandable cylindrical body)
46 Front end portion 47 Slit 48 Male screw 49 Rear end portion 50 Slit 51 Male screw 53 Maximum diameter portion 54 Intermediate diameter portion 55 Minimum diameter portion 56 Rear end portion 58 Straight flow path (communication conduit)
59 Internal communication passage (communication pipeline) (opening on the inlet side)
60 External communication path (communication pipeline) (exit side opening)
62 Sliding valve 65 Cylindrical body 66 Front end small diameter portion 67 Rear end large diameter portion 68 Abutting portion 69 Inner conduit 70 Annular recess 73 Tightening ring 74 Female threaded hole 76 Tightening ring 77 Female threaded hole 78 Annular contacting part OL1 OL2 O-ring S Tension spring (biasing means)

Claims (3)

When inserting the insertion portion of the child endoscope into the insertion tube of the parent endoscope, in the child endoscope insertion aid attached to the entrance side opening of the insertion tube,
A telescopic cylindrical body having a large-diameter cylindrical body and a small-diameter cylindrical body that are slidably coupled together;
A connecting portion with the inlet-side opening formed at one outer end of the telescopic cylindrical body and an inlet end formed at the other outer end;
An O-ring interposed between the small-diameter cylindrical body and the cylindrical sliding surface of the large-diameter cylindrical body to hold the cylindrical sliding surface in an airtight manner;
Provided in the communication pipe that communicates the internal pipe of the telescopic cylindrical body and its external space, the gas flow between the internal pipe and the external space is normally blocked, and the atmospheric pressure in the internal pipe A check valve mechanism that allows gas to flow out from the internal pipe line to the external space when exceeds a predetermined value,
The check valve mechanism is
The inner pipe is slid in an airtight state on the inner surface of the communication pipe, and is normally positioned on the inlet side opening side communicating with the inner pipe from the outlet side opening communicating with the outer space of the communication pipe. A sliding valve that blocks the flow of gas between the external spaces;
The sliding valve is urged so as to be positioned on the inlet side opening side from the outlet side opening, and when the atmospheric pressure in the internal conduit exceeds the predetermined value, the sliding valve causes the outlet to move to the outlet side. And a biasing means for allowing the opening to be opened beyond the side opening and opening the outlet side opening, and a child endoscope insertion assisting tool in a parent-child endoscope system. In the child endoscope insertion aid in the parent-child endoscope system according to claim 1,
A cylindrical body whose inner peripheral surface is in airtight contact with the outer peripheral surface of the child endoscope and is fitted to the inlet end of the telescopic cylindrical body;
A child endoscope insertion aid in a parent-child endoscope system comprising: an O-ring that hermetically holds a space between the outer peripheral surface of the cylindrical body and the inner peripheral surface of the inlet side end of the telescopic cylindrical body . The child endoscope insertion aid in the parent-child endoscope system according to claim 1 or 2,
  A child endoscope insertion aid in a parent-child endoscope system in which the biasing means is a tension spring.

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