JP5383312B2 - Duckbill valve - Google Patents

Description

  The present invention relates to a valve that regulates the flow of fluid, and more particularly, to a duckbill valve that is used in a sheath tube for medical purposes.

The outer tube (trocar), which is used for endoscopic pneumoperitoneum surgery and serves as an insertion path for surgical instruments such as forceps, is required to have airtightness so that the abdominal gas filled in the abdominal cavity does not leak out of the body cavity. As a function for that purpose, a check valve for restricting the flow of gas from the distal end side (inner abdominal cavity) is provided in the outer tube housing. There are several check valves, but one of them is an elastic body that converges from the inlet side (base side) to the outlet end (tip side) of the valve. A duckbill valve comprising a pair of substantially flat lips extending to each other and a slit formed by combining the two lips at the outlet end, and a diameter of a surgical instrument to be inserted, which is also made of an elastic body. Combined with a ring-shaped valve having a hole of the same diameter and installed in the outer tube housing, when the surgical instrument is inserted, the instrument is in close contact with the hole of the ring-shaped valve Thus, there is a check valve that prevents gas leakage to the outside of the body and maintains airtightness by closing the slit of the duckbill valve when no surgical instrument is inserted. (For example, cited reference 1)
However, when the general duckbill valve is attached to a mantle tube for pneumoperitoneum surgery, it is necessary to make the valve small and thin because of the restriction of the size of the mantle tube. May be weakened, and there may be a case where the fluid flow from the tip side cannot be sufficiently regulated (airtightness cannot be obtained). Especially in this application, once a surgical instrument is inserted into and removed from the duckbill valve, the slit will open and the shape will not be restored, and the slit that will be the joint of the lip will be securely closed. However, there is a problem that sufficient airtightness cannot be obtained.
Some surgical instruments have sharp tips, and there is a concern that the tip of the valve may be accidentally punctured and damaged when the instrument is inserted.

  Further, with respect to these problems, a projecting portion is provided so as to face the tip portion of the duckbill valve, in which the slit of the lip portion is kept closed to reliably regulate the fluid flow. A duckbill valve configured as described above has been proposed. (Patent Document 2)

JP2001-443 JP2007-239865A

According to the duckbill valve of the cited document 2, by providing the protrusion, the thickness of the tip of the lip becomes substantially larger than the thickness of the other part of the lip. Since the portion is not easily deformed and the slit is easily kept closed, it contributes to some extent to restricting the flow. In addition, the thick tip of the lip portion protects against erroneous puncture.
However, when the tip of the lip portion is formed thick like this, when the surgical instrument is inserted into and removed from the outer tube, the contact resistance between the surgical instrument and the slit of the lip portion increases, It is difficult to remove, and there is a concern that the lip part may stick to the instrument when the instrument is removed, and the lip part may be rolled up and reversed. There is a problem that it is difficult to adjust the balance of good operability with the wall thickness of the lip portion in view of individual differences of surgical instruments. In addition, when it is intended to insert and remove a surgical instrument, there is a question as to whether or not it is possible to reliably prevent deformation such as an open flaw of a slit and maintain a reliable closed state only by this means.

  Therefore, the present invention is capable of reliably regulating the flow of fluid from the distal end side, particularly in a valve that is used in a mantle tube for medical purposes, and is capable of inserting and removing surgical instruments and the like. An object of the present invention is to provide a duckbill valve that is smooth in operation and is not deformed by the operation of the surgical instrument.

The present invention comprises a pair of inclined lip surfaces extending so as to converge from the base side toward the tip, and a linear slit on the mating surface serving as the tip of the lip surface. In a duckbill valve that regulates the flow of fluid in the direction, a flexible sheet-like shape that spreads in a wing shape from the vicinity of the lip tip to the vicinity of the lip periphery in a position perpendicular to the slit, upright and opposed to a pair of lip surfaces A plurality of ribs are provided in parallel, and the rising end of the rib near the outer periphery of the lip is formed outward (larger) than the outer periphery of the lip and protrudes from the outer periphery of the lip.

Further, the wing-shaped rib is preferably formed or configured as follows.
・ The ribs are arranged in parallel and have 3 pairs .
Ribs located at the upper end of the rising edge of the lip near the outer periphery side of (height), or equivalent to the position of the tip portion of the lip (height), or upwardly formed on the (front end side), the upper end of the rib The surface is formed so as to be inclined downward (base side) from the outer peripheral side toward the center side (slit side).
-The rising end of the rib near the lip tip is the same as or lower (base side) of the lip tip.
-The upper end surface of the rib is provided with a linear portion at least partially on the outer peripheral side of the lip.
-The thickness of the rib is 0.35 mm or more and 0.65 mm or less.

  Furthermore, it is preferable to coat the inner surface of the valve body with a lubricant, and it is more preferable that the lubricant is a fluororesin.

(Function)
According to the duckbill valve of this means, a plurality of pairs of ribs having a relatively large surface extending in a wing shape from the vicinity of the lip tip to the vicinity of the lip outer periphery are provided upright and opposed to the pair of lip surfaces at a position orthogonal to the slit. By providing (preferably three pairs), the strength of the lip portion is increased and the shape retaining property is improved, so that it is easy to maintain the closed state of the slit which is a natural state. In particular, when mounted in the housing of the outer tube, the rib on the outer peripheral side of the rib (the part corresponding to the outer periphery of the valve body) contacts the inner wall of the housing, so that the rib is slightly inward from the inner wall. The pressing action works, and by pressing the slit in the direction to close from both sides, the slit can be securely held in a closed state. Furthermore, when the surgical instrument is inserted in this state, the slit is expanded, and the outer peripheral side of the rib is pressed against the inner wall of the housing, so that a force acts also in the direction in which the rib presses and closes the slit by the reaction from the inner wall, Even with the surgical instrument attached, the airtight state can be maintained to some extent only by this duckbill valve, and even after the instrument is removed, the lip portion remains in its original closed state by the action of pressing the rib against the slit. It is easy to return and can be prevented from being deformed by an opening flaw.

  In addition, the rib is formed as a flexible sheet that expands into a wing shape with a thin wall thickness, and thus, due to its flexibility, for example, forming a thick lip wall causes a problem. When the instrument is inserted or removed, the contact resistance with the instrument is not significantly increased, and the smooth opening and closing of a general thick duckbill valve can be maintained. Also, since the shape retention is improved by providing a plurality of pairs of ribs having a relatively large surface, the ribs are not caught on the back side due to contact resistance with the surgical instrument when the surgical instrument is removed. Prevents reversal.

Furthermore, when the ribs are in three pairs, the above-described effect can be most exerted in the size of the duckbill valve incorporated in the outer tube used for the endoscopic pneumothorax operation. That is, if the ribs are one pair or two pairs, there is a concern that a sufficient pressing effect on the slit cannot be obtained, and reliable airtightness cannot be obtained, and an instrument with a sharp tip is used as a surgical instrument. In such a case, a sharp tip portion is introduced into a thin lip portion such as a gap between the ribs, and there is a problem that the possibility of erroneous puncture of the lip portion is increased. On the other hand, when the number of pairs is four or more, the duckbill valve of the size of this application will push the slit more strongly than necessary, and the strength of the lip will become too strong, so that surgical instruments can be inserted and removed. There is a concern that the operability will deteriorate.
For the same reason, if the thickness of the rib is 0.35 mm or more and 0.65 mm or less, the above-described effect can be exhibited most in the application. That is, if it is formed thinner than 0.35 mm, the effect of pressing to the slit cannot be sufficiently obtained, and there is a concern that airtightness cannot be taken, and if formed thicker than 0.65 mm, the slit is pressed stronger than necessary, There is a concern that the operability may be deteriorated due to excessive strength of the ribs.

In addition, by forming the rising end of the rib near the outer periphery of the lip to be equal to the outer periphery of the lip or outward from the outer periphery, the rib is formed on the inner wall of the outer tube when the rib is incorporated into the outer tube housing. The outer peripheral end can be reliably contacted, and the rib width is larger than the inner wall, so that the rib can be mounted in the housing while being pressed against the inner wall, and the slit formed by the rib. The pressing effect on can be enhanced.
Further, the height of the upper end of the rising end of the rib near the outer periphery of the lip is equal to or higher (higher) than the position of the tip of the lip, and the upper end surface of the rib is If it is formed to be inclined downward from the outer peripheral side toward the center side, the outer peripheral side of the rib is at a high position, the inner side is at a low position, and it is inclined downward toward the central direction, The contact area with the inner wall of the housing on the outer periphery of the rib on the side to which force is applied is large, and the contact area with the rib on the tip side on the lip side on the force receiving side is small, so that the force is efficiently applied to the necessary part (lip surface) In addition, it is considered that the force is transmitted to the lip surface effectively by the pushing force from the oblique upper side acting on the inclined lip, and it is expected that the rib will slightly enhance the effect of pressing the lip portion. . Furthermore, at the outer peripheral side of the lip on the upper end surface of the rib, even if a straight part is provided at least in part, it does not have a straight part, and the tip has an acute angle and is inclined only. It is considered that the escape of the pressing force is reduced, and it is expected that the pressing action on the slit by the rib is slightly increased.
In addition, by forming the rising edge near the lip tip of the rib below the lip tip, the rib can be prevented from pressing directly against the slit at the tip of the lip, making it stronger than necessary. The action can be applied to the slit portion to prevent the smooth insertion and removal of the surgical instrument. Further, it is possible to prevent an increase in the thickness of the rib leading edge more than necessary.

  Furthermore, by coating the inner surface of the valve body with a fluorine resin or the like as a lubricant, the frictional resistance during insertion and removal from the surgical instrument is reduced, and smooth insertion and removal operations can be performed. In particular, in this means, the contact resistance with the instrument slightly increased by the rib can be offset.

According to the duckbill valve of the present invention, in particular, in a valve that is disposed and used in a mantle tube for medical purposes, the rib having the above-described configuration and the above-described action cause a certain degree of occlusion even when the surgical instrument is mounted. When the surgical instrument is not inserted, the slit can be reliably closed, and the fluid flow from the distal end side can be reliably regulated.
In addition, it is possible to provide a duckbill valve which can be smoothly inserted and removed from a surgical instrument placed in the mantle tube and which is not deformed by the operation of the surgical instrument.

The block diagram of the duckbill valve which shows embodiment of this invention. Sectional drawing of the front view of the said instrument. The block diagram of the mantle tube which attached the duckbill valve of the said embodiment. The block diagram which shows the ring valve combined with the said duckbill valve.

Hereinafter, it explains in detail, referring to drawings for one form of a duckbill valve of the present invention.
FIG. 1 is a configuration diagram of a duckbill valve of the present embodiment, in which A is a front view, B is a side view, C is a top view, and FIG. 2 is a cross-sectional view of the front view.
The duckbill valve of this embodiment is a mantle tube (trocar) that is punctured in the abdominal wall or the like mainly during endoscopic abdominal surgery and serves as a passage for introducing surgical instruments such as an endoscope or forceps into the body cavity. ) And is used as a check valve to regulate the flow of gas from the distal end side, so that the abdominal gas filled in the abdominal cavity does not leak outside the body. It is used in combination with a ring valve, which will be described later, which regulates the flow of the device and serves as a valve when the surgical instrument is mounted.
The valve of this example is formed as an integrally molded product made of rubber elastic resin (silicone resin in this example), and has an annular valve base 1 and a cylindrical valve body 2 that is thinner than the valve base 1. A pair of inclined lip surfaces 3 extending from the middle (base side) of the valve body 2 so as to converge toward the tip, and linear slits formed on the mating surface of the tip of the lip surface 3 4 and a position (direction) orthogonal to the slit 4, upright on the pair of lip surfaces 3 and opposed to each other with the slit 4 interposed therebetween, from the vicinity of the lip tip 31 to the vicinity of the lip outer periphery 32. It is comprised from each part of 3 pairs of sheet-like ribs 5 extended to a wing shape. In this example, a fluororesin is used as a lubricant for reducing contact frictional resistance when inserting or removing the surgical instrument from the outer tube over the entire inner surface of the valve including the facing surface of the slit 4 facing each other. (PTFE: polytetrafluoroethylene) was formed by coating.

The valve base 1 is formed in an annular shape at the proximal end of the present duckbill valve, and is thicker than other parts (in this example, thicker) in order to maintain shape retention strength such as preventing deformation of the entire valve. 2.35 mm), projecting outward from the valve body 2 to be described later, and being fitted into the outer tube by the step of the projecting portion, it is locked to the housing end 622 of the outer tube 6 to be described later. The position is fixed to the outer tube 6.
The valve body 2 is formed in a thin cylindrical shape (in this example, 1 mm thick) continuously upward from the valve base 1, and is attached to the housing inner wall 621 when attached to the outer tube 6. It is formed as an outer diameter (10 mm in this example) that matches the inner diameter.
As described above, the lip surface 3 is formed in a thin film shape (in this example) as a pair of inclined surfaces extending from the middle of the valve body 2 (lip outer peripheral portion 32) so as to converge toward the tip (lip tip 31). In this example, it is formed as a curved surface that curves inward from about R17 to R19.
The slit 4 has a length that allows a surgical instrument inserted into the outer tube to be easily inserted into and removed from the mating surface of the lip tip 31 of the lip surface 3. In this example, the slit 4 is a 7.5 mm straight cut. The passage is formed when the surgical instrument is inserted and removed.

As described above, the rib 5 stands upright on the lip surface 3 in the direction orthogonal to the slit 4 and faces the lip surface 3 with the slit 4 interposed therebetween, and between the vicinity of the lip tip 31 and the vicinity of the lip outer peripheral portion 32. In this example, three pairs are formed on the center line and on both sides of the sheet, and the like is formed into a sheet shape (thickness 0.5 mm in this example) having a thin thickness of 0.35 mm or more and 0.65 mm or less. They were arranged in parallel at intervals (2 mm intervals in this example).
The rib 5 of this example will be described in more detail. The rib tip rising portion 51 in the vicinity of the lip tip 3 that is the setting position of the rib 5 is slightly lowered (base side) from the lip tip 31 where the slits 4 are formed. The position (in this example, about 0.5 mm downward) is set, while the rib outer peripheral rising portion 52 in the vicinity of the lip outer peripheral portion 32 is a position slightly protruding from the outer peripheral surface of the valve body 2 (in this example, 0.8 mm outward), the lower end of the outer peripheral rising portion 52 is set at a height equivalent to the lip outer peripheral portion 32, and the upper end 521 is higher than the lip tip 31 (tip side). In the example, the upper end surface 53 serving as the upper surface of the rib 5 is formed in a horizontal plane with the outer peripheral side 8 mm from the outer peripheral rising portion upper end 521 as a straight line portion in the present example. The formed as inclined surfaces sloping towards the rib tip rising portion 51, is configured by arranging in parallel with 3 pairs at equal intervals respectively facing them.

FIG. 3 is a configuration diagram of the outer tube incorporating the duckbill valve according to the embodiment, and shows a state in which A is assembled and B is assembled. FIG. 4 shows a ring valve used in combination with the duckbill valve.
The outer tube 6 of this embodiment is attached to and attached to a cylindrical outer tube 61 serving as a puncture portion, a housing 62 serving as a base of the outer tube and mounting a valve in the lumen 620, and a rear end portion of the housing 62. A port cap 63 provided with a port 631 for fixing the valve is provided, and the duckbill valve is incorporated into the mantle tube 6 by inserting the duckbill valve into the lumen 620 of the housing 62 of the mantle tube. The outer diameter of the valve body 2 (in this example, 10 mm) is formed to be approximately equal to the diameter of the housing lumen 620, and the outer periphery of the valve body 2 is mounted in contact with the housing inner wall 621. The position (projection) of the valve base 1 is in contact with the housing end surface 622, and the position is fixed in a state where the valve base 1 protrudes from the rear end of the housing. By mounting in this way, the rib 5 formed to protrude outward from the valve body 2 is larger than the diameter of the housing lumen 620, so that the rib 5 is mounted in a deformed state (crushed state). In addition, since the ribs 5 are formed to face each other, the ribs 5 are pressed from both sides toward the lip 3 and the slit 4 at the center from the inner wall 621 of the housing, and support the closed state of the slits 4. As a result, the flow of fluid from the outer tube 61 side of the outer tube 6 can be reliably regulated.

However, in consideration of the situation where a surgical instrument is inserted into the duckbill valve, even in this state, although the above-described action is expected to have higher airtightness than a conventional general duckbill valve, A slight gap between the slit and the surgical instrument is unavoidable, and in this example, the following ring valve 7 is used in combination in order to maintain reliable airtightness when the surgical instrument is mounted. Yes.
The ring valve 7 of this example is integrally molded from a rubber elastic resin (silicone resin in this example) like the duckbill valve, and has a hole 71 formed with a slightly smaller diameter than the surgical instrument to be mounted, and the duckbill In order to combine with the valve, it is configured to include an engagement portion 72 with the valve base 1 formed in a concave shape so as to wrap the valve base 1 of the duckbill valve, and in this example, in order to easily introduce a surgical instrument, The hole 71 provided in the center was formed as an end inclined in a mortar shape from the periphery.
Then, the ring valve 7 is attached to the outer tube 6 on which the duckbill valve is mounted so as to cover the valve base 1 protruding from the rear end of the outer tube 6, and is further attached to the housing rear end of the outer tube 6. A port cap 63 having a port 631 for inserting a surgical instrument is fitted so as to cover the ring valve 7 to form the outer tube 6 of this embodiment.
With this configuration, when a surgical instrument is attached to the mantle tube 6, in addition to the duckbill valve, it is possible to ensure airtightness by blocking by the hole 71 of the ring valve 7, and when the surgical instrument is not attached, It is possible to ensure airtightness by closing the lip 3 of the duckbill valve.

1. Valve base 2. 2. Valve body Lip (surface)
31. Lip tip 32. 3. Lip outer peripheral part Slit 5. Rib 51. Rib tip rising portion 52. Rib outer peripheral portion rising portion 521. Upper end of outer peripheral rising portion 53. Rib upper end surface 531. Rib upper end surface horizontal portion 532. 5. Rib upper end surface inclined portion Outer tube 61. Outer cylinder 62. Housing 620. Housing lumen 621. Housing inner wall 622. Housing end face 63. Port cap 631. Port 7. Ring valve 71. Hole 72. Engagement part
73. Mortar-shaped inclined part

Claims (8)

A fluid flow from the distal side toward the proximal direction, comprising a pair of inclined lip surfaces extending so as to converge from the proximal side toward the distal end, and a linear slit at the mating surface of the distal end of the lip surface In a duckbill valve that regulates a plurality of pairs of flexible sheet-like ribs that extend in a wing shape from the vicinity of the lip end to the vicinity of the lip outer periphery in a position that is perpendicular to the pair of lip surfaces and opposed to the pair of lip surfaces. The duck bill valve is characterized in that the rising end of the rib near the outer periphery of the lip is formed outward (larger) than the outer periphery of the lip .   The duckbill valve according to claim 1, wherein the rib includes three pairs in parallel. The position of the upper end of the rising edge of the rib near the lip outer periphery is equal to the position (height) of the lip tip, or is formed above (tip side), and the upper end surface of the rib is more central side either duckbill valve according to claim 1 or 2 is formed to be inclined downward (base side) toward the (slit side). The duckbill valve according to any one of claims 1 to 3 , wherein a rising end of the rib in the vicinity of the lip tip is formed at a position equal to or lower (base side) of the lip tip. The duckbill valve according to any one of claims 1 to 4 , wherein an upper end surface of the rib includes at least a linear portion on an outer peripheral side of the lip. The duckbill valve according to any one of claims 1 to 5 , wherein a thickness of the rib is 0.35 mm or more and 0.65 mm or less. The duckbill valve according to any one of claims 1 to 6 , wherein an inner surface of the valve body is coated with a lubricant. The duckbill valve according to claim 7 , wherein the lubricant is a fluororesin.

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