JP5221194B2 - Endoscope deaeration prevention valve - Google Patents

Description

  The present invention relates to an endoscope deaeration prevention valve that prevents leakage of air sent from the distal end of an endoscope, for example, a guide tube guide that guides insertion of an endoscope that is orally inserted into a patient. The present invention relates to a deaeration prevention valve provided at an end.

  In endoscopic surgery and the like performed using a guide tube that guides the insertion of an endoscope that is orally inserted into a patient, the endoscope has a wide field of view, and is capable of performing procedures and the like. There is a case in which air is sent from the distal end of the endoscope to the affected area to inflate the periphery of the affected area. At this time, if air escapes from the proximal end of the guide tube, the periphery of the affected area cannot be inflated. For this reason, there is known a deaeration prevention valve provided at the proximal end of the guide tube so that air does not leak from the proximal end of the guide tube (see, for example, Patent Document 1).

This deaeration prevention valve is provided integrally at the proximal end of the guide tube, and is provided in the tubular body, a membrane-like valve body that closes the tubular body, the valve body, and is freely insertable through the endoscope. The opening edge of the hole is in close contact with the outer peripheral surface of the endoscope inserted in the guide tube to prevent air from leaking.
JP 7-163516 A

  The conventional deaeration prevention valve prevents air leakage by bringing the opening edge of the hole of the valve body into close contact with the outer peripheral surface of the endoscope. However, the endoscope may move in various directions, and depending on the movement of the endoscope, there is a large gap between the endoscope and the opening edge of the hole, causing a large amount of air leakage unintentionally. There is a risk of doing.

  In view of the above, an object of the present invention is to provide a deaeration prevention valve that can reliably prevent an unintended large amount of air leakage.

In order to achieve the above object, the present invention includes a cylindrical body and a hole portion through which the endoscope can be inserted, and a hole is formed in the outer peripheral surface of the endoscope when the endoscope is inserted into the cylindrical body. and a film-like valve body which closes the tubular body by the opening edge parts are in close contact, the endoscope deaerating preventing air is prevented from leaking from the cylindrical body to be fed out from the tip of the endoscope in the valve, extends toward the opening edge of the hole in the valve body to the other party, sends a tubular contact portion in close contact with the outer peripheral surface of the endoscope is inserted into the cylindrical body, from the tip of the endoscope An air discharge mechanism that discharges excess air, and the air discharge mechanism is provided in the valve body, and has a small diameter so that the air can be expanded and spread when the difference in pressure between the inside and outside of the valve body exceeds a predetermined amount. It is the pore formed in this.
The present invention also includes a cylindrical body and a hole portion through which the endoscope can be inserted, and the opening edge of the hole portion is in close contact with the outer peripheral surface of the endoscope when the endoscope is inserted into the cylindrical body. In the endoscope deaeration preventive valve for preventing the air sent out from the distal end of the endoscope from leaking from the cylindrical body A cylindrical contact portion that extends forward from the opening edge of the hole and is in close contact with the outer peripheral surface of the endoscope that is inserted into the cylindrical body, and discharges air that has been sent excessively from the distal end of the endoscope An air discharge mechanism, and the air discharge mechanism is formed in the cylindrical body and is provided in a through hole penetrating from an inner peripheral surface to an outer peripheral surface; and an opening amount of the through hole provided in the outer peripheral surface of the cylindrical body And an opening amount adjusting member that is adjustable.

  According to the present invention, since the cylindrical close contact portion that extends forward from the opening edge of the hole portion is provided, the area that is in close contact with the outer peripheral surface of the endoscope becomes larger than in the related art. Therefore, an unintended large amount of air leakage can be surely prevented.

  In addition, in the conventional deaeration prevention valve, since the outer peripheral surface of the endoscope is in contact only at the opening edge of the hole portion of the valve body, the endoscope is likely to wobble with the portion in contact with the valve body as a fulcrum. The operation of the endoscope was difficult. Therefore, if the length from the proximal end to the distal end of the close contact portion of the present invention is a predetermined length that suppresses the wobble of the endoscope inserted into the close contact portion, the wobble of the endoscope with respect to the deaeration prevention valve is reduced. This makes it easy to operate the endoscope. The predetermined length of the contact portion is obtained by experiment in advance to determine the length that can suppress the wobbling of the endoscope based on the type of endoscope to be inserted (outer diameter, etc.) and the material of the valve body of the deaeration prevention valve. Is set.

  By the way, if too much air is sent from the endoscope to the periphery of the affected area, the endoscope deaeration prevention valve configured as described above does not leak air, so that the area around the affected area swells more than necessary, increasing the burden on the patient. Is also possible. In this case, if the endoscope deaeration prevention valve is provided with an air discharge mechanism that discharges air that has been excessively sent from the distal end of the endoscope, the air around the affected area can be discharged by the air discharge mechanism. Even when the air is excessively sent from the endoscope to the vicinity of the affected part, it is possible to prevent the burden on the patient from increasing.

  For example, the air discharge mechanism may be configured such that a fine hole is formed in the valve main body, and when the difference between the atmospheric pressure around the affected area and the atmospheric pressure becomes a predetermined amount or more, the fine hole expands and the air escapes. .

Further, a through-hole penetrating from the inner peripheral surface to the outer peripheral surface is formed in the cylindrical body, and a predetermined amount of air is discharged from the through-hole, and the through-hole is formed on the outer peripheral surface of the cylindrical body. You may provide the opening amount adjustment member which can adjust opening amount freely. As a result, even when the air is excessively sent from the endoscope to the periphery of the affected area, the opening amount of the through hole is adjusted by the opening amount adjusting member to adjust the discharge amount of the air. It can be adjusted to any pressure.

  As shown in FIG. 1, the endoscope deaeration prevention valve 1 according to the first embodiment of the present invention includes a guide tube T that guides insertion of an endoscope (not shown) that is orally inserted into a patient. It is detachably attached to the proximal end, and prevents air sent from the distal end of the endoscope around the affected area from leaking from the proximal end of the guide tube T. A mouthpiece M that is attached to the mouth of the patient is provided at the proximal end of the guide tube T so that the patient cannot bite the guide tube T and the endoscope.

  As shown in FIG. 2, the deaeration prevention valve 1 is provided with a tubular body 2 and a membrane-like valve body 3 made of an elastic material such as silicone rubber so as to close the proximal end side opening of the tubular body 2. It has been. In the center of the valve body 3, a hole 31 is provided, and a cylindrical contact portion 32 extending from the opening edge of the hole 31 to the front is provided.

  The close contact portion 32 is formed to have a smaller diameter than the outer diameter of the endoscope. When the endoscope is inserted into the cylindrical body 2, the close contact portion 32 is in close contact with the outer peripheral surface of the endoscope. Therefore, the area closely contacting the outer peripheral surface of the endoscope can be increased as compared with the conventional product, and the air sent from the distal end of the endoscope to the vicinity of the affected part is surely prevented from leaking from the proximal end of the guide tube T. can do.

  The length L from the proximal end to the distal end of the contact portion 32 is a predetermined length that suppresses the wobbling of the endoscope inserted into the contact portion 32. The predetermined length L is obtained in advance by experiment to determine the length capable of suppressing the wobbling of the endoscope based on the type of endoscope to be inserted (outer diameter, etc.), the material of the valve body 3 of the deaeration prevention valve 1, and the like. Is set. Thereby, the wobbling of the endoscope inserted in the close contact portion 32 can be suppressed, and the operation of the endoscope can be facilitated.

  The valve body 3 is provided with a pair of pores 33, 33 as an air discharge mechanism. The pores 33 and 33 are formed to have a small diameter so that when the difference between the pressures on the inside and outside of the valve body 3 is equal to or greater than a predetermined amount, the pores spread and air is removed. The pores 33 and 33 expand as the difference in atmospheric pressure increases, and the atmospheric pressure around the affected area is quickly adjusted to an appropriate atmospheric pressure. Thereby, even if air is excessively sent from the endoscope to the vicinity of the affected area, the air can be appropriately discharged from the pores 33 and 33, and the burden on the patient can be reduced.

  In the first embodiment, the pores 33 and 33 are used as the air discharge mechanism. However, the present invention is not limited to this. For example, instead of the pores 33 and 33, the removal of the second embodiment shown in FIG. The air prevention valve 1 may be configured. Hereinafter, the air discharge mechanism of the deaeration prevention valve 1 of the second embodiment will be described with reference to FIG. Note that in the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The cylindrical body 2 of the deaeration prevention valve 1 according to the second embodiment is provided with a through hole 21 that is positioned on the distal end side of the valve body 3 and penetrates from the inner peripheral surface to the outer peripheral surface. On the outer peripheral surface of the cylindrical body 2, an annular body 4 that covers the through hole 21 in an airtight manner is provided so as to be rotatable with respect to the cylindrical body 2. A communication hole 41 is formed in the annular body 4, and the through hole 21 and the communication hole 41 can be communicated by rotating the annular body 4.

  The area where the through hole 21 and the communication hole 41 communicate with each other can be finely adjusted by rotating the annular body 4. Thereby, even if air is excessively sent from the endoscope to the periphery of the affected area, the opening of the through hole 21 is adjusted by adjusting the area where the through hole 21 and the communication hole 41 communicate with each other by turning the annular body 4. Thus, the amount of air discharged can be adjusted, and the surrounding area of the affected area can be set to an arbitrary pressure. That is, in the second embodiment, the annular body 4 corresponds to the opening amount adjusting member of the present invention.

  In both embodiments, the deaeration prevention valve 1 that can be attached to and detached from the proximal end portion of the guide tube T has been described. However, the deaeration prevention valve may be integrated with the guide tube.

  In both the embodiments, the deaeration prevention valve 1 provided at the proximal end of the guide tube T has been described. However, the deaeration prevention valve 1 is not limited to the guide tube. For example, the deaeration prevention valve provided in the mouthpiece may be used. The effects of the present invention can be obtained. In this case, the endoscope is inserted into the mouthpiece without using the guide tube and inserted into the patient.

  The shape of the contact portion 32 is not limited to a cylindrical shape, and may be, for example, a truncated cone shape having a diameter reduced toward the front, or a so-called duck bill having a diameter reduced toward the front and having a linear slit at the tip. It may be a valve-like shape. In this case, even when the outer diameters of the endoscopes are slightly different, it is possible to cope without replacing the deaeration prevention valve.

  Moreover, in 2nd Embodiment, although what provided the annular body 4 which adjusts the opening amount of the through-hole 21 was demonstrated as an air discharge mechanism, an air discharge mechanism is the 3rd Embodiment shown in FIG. 4, for example. Like the deaeration prevention valve 1, the annular body 4 may not be provided and only the through hole 21 may be used. In this case, the through hole 21 may be formed to have a relatively small diameter so that a small amount of air is discharged.

Explanatory drawing of the guide tube for endoscopes using the deaeration prevention valve for endoscopes of 1st Embodiment of this invention. Sectional drawing which shows the deaeration prevention valve for endoscopes of 1st Embodiment. Sectional drawing which shows the deaeration prevention valve for endoscopes of 2nd Embodiment. Sectional drawing which shows the deaeration prevention valve for endoscopes of 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Deaeration prevention valve, 2 ... Cylindrical body, 21 ... Through-hole, 3 ... Valve main body, 31 ... Hole part, 32 ... Close_contact | adherence part, 33 ... Fine hole, 4 ... Ring-shaped body, 41 ... Communication hole, M ... Mouthpiece, T ... Guide tube.

Claims (2)

The cylindrical body and a hole portion through which the endoscope can be inserted are provided , and when the endoscope is inserted into the cylindrical body, the opening edge of the hole portion is brought into close contact with the outer peripheral surface of the endoscope. and a film-like valve body which closes the, in endoscopic deaerating valve the air sent out from the distal end of the endoscope is prevented from leaking from the cylindrical body,
A tubular contact portion that extends from the opening edge of the hole to the valve body and contacts the outer peripheral surface of the endoscope that is inserted into the tubular body, and air that is excessively fed from the distal end of the endoscope An air discharge mechanism for discharging
The air discharge mechanism is provided in the valve body, and is a fine hole formed to have a small diameter so that the air expands when air pressure difference between the inside and outside of the valve body exceeds a predetermined amount. Deaeration prevention valve for endoscope. The cylindrical body and a hole portion through which the endoscope can be inserted are provided , and when the endoscope is inserted into the cylindrical body, the opening edge of the hole portion is brought into close contact with the outer peripheral surface of the endoscope. and a film-like valve body which closes the, in endoscopic deaerating valve the air sent out from the distal end of the endoscope is prevented from leaking from the cylindrical body,
A tubular contact portion that extends from the opening edge of the hole to the valve body and contacts the outer peripheral surface of the endoscope that is inserted into the tubular body, and air that is excessively fed from the distal end of the endoscope An air discharge mechanism for discharging
The air discharge mechanism is provided in a through-hole formed in the cylindrical body and penetrating from an inner peripheral surface to an outer peripheral surface, and an outer peripheral surface of the cylindrical body, and an opening amount adjustment capable of adjusting an opening amount of the through-hole. A deaeration prevention valve for an endoscope, comprising: a member .

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