JP2002209904A - Valve structure of medical equipment, and cannula having incorporated valve structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve structure of medical equipment capable of easily handing the medical equipment such as a surgery instrument, preventing damaging of the medical equipment in handling or damaging of a seal member, and certainly opening or closing a duct. SOLUTION: In the duct of this cannula 200, a seal valve 101 as an unidirectional valve and a seal packing 110 are arranged in series. When an intruding end of the surgery instrument 220 is inserted into the cannula 200, the intruding end of the surgery instrument 220 comes into contact with gradient surfaces 123 of flaps 120 and 121, the flaps 120 and 121 oscillate, tip parts 124 of the flaps 120 and 121 are pressed onto a movable part 105 of the seal valve 101, a slit 102 opens, and the surgery instrument 220 can be inserted into the slit 102 without coming into contact with the seal valve 101.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve structure provided on a medical device such as a cannula having a conduit through which a medical instrument such as a surgical instrument can be inserted and removed so as to open and close the conduit. The present invention relates to a cannula having a valve structure incorporated therein.

[0002]

2. Description of the Related Art To explain an example of a cannula as a medical device, endoscopic surgery is currently capable of early recovery and rehabilitation after surgery due to its minimally invasiveness, and is cosmetically applicable. Is also excellent, so QO for patients
Attention is drawn to L (quality of life). Against this background, the development of cannulas for use in endoscopic surgery has been active.

[0003] In general, in an endoscopic operation, a small incision is made in the abdomen, and a medical device such as an elongated tube or a cannula that serves as a guide between the inside and outside of the body is inserted into the incision. Then, a surgical instrument such as a forceps or an electric scalpel is inserted through the conduit such as the cannula and freely inserted into and removed from the body, so that the operator can perform a desired diagnosis and operation.

When the trocar obturator is incorporated into the cannula, a trocar assembly is constructed. The trocar obturator has a sharp puncture at its tip and is inserted through the cannula.A valve mechanism is provided inside the cannula to maintain airtightness between the inside and outside of the body. .

When the trocar assembly is used, a sharp puncture portion of the trocar obturator is pierced into the patient's body with the trocar obturator inserted through the cannula, and after piercing, only the trocar obturator is removed. By withdrawing and leaving only the cannula, the cannula forms a guide between the body and the body.

[0006] The operation field is secured by injecting CO ₂ gas into the body at a constant pressure (usually 8 to 12 mmHg) after the first incision to inflate the body. Thereafter, the insufflation tube is connected to the cannula and the body is inflated to ensure a visual field during subsequent operations.

[0007] Therefore, a medical device that can serve as a guide between the inside and the outside of the body, such as a long and thin air supply tube and a cannula in an operation under an endoscope, needs to be provided with a valve structure for holding the air pressure inside the body. If this valve structure is not provided, it is difficult for an operator to perform an operation because the internal pressure cannot be maintained and an operation field cannot be secured.

A valve structure in a medical device such as a cannula for maintaining the internal air pressure generally requires two requirements. One is that the surgical instrument must be inserted into the cannula to maintain the pressure inside the body during surgery, and the other is when the surgical instrument is not inserted. In other words, it is necessary to have a function to maintain the atmospheric pressure in the body. Various attempts have been made in the prior art to meet such demands.

For example, in US Pat. No. 4,943,280, a flap valve pivotally mounted within a cannula is spring loaded to automatically align with a valve seat also within the cannula. When the surgical instrument is inserted into the cannula, the flap valve is opened by the surgical instrument, and when there is no surgical instrument in the cannula, the flap valve is spring-loaded into the valve seat. It is pressed and closed, and the internal pressure of the body is maintained. US Patent 4,654,030
Japanese Patent Application Publication No. JP-A-2003-115125 discloses a similar flap valve.

In addition, by forming an elastic member such as silicon in the valve assembly in the cannula,
2. Description of the Related Art A cannula has been provided for keeping the internal pressure and the external atmosphere constant (see, for example, US Pat. No. 4,655,752 and US Pat. No. 4,909,798).

In addition, various types of surgical instruments have been developed with the development of endoscopic surgery. Recently, for example, improvements have been made as disclosed in JP-A-6-63156. Development of valve assemblies is also underway.

[0012]

As described above, many valve assemblies having a sealing function using a flap or an elastic member have been developed in order to maintain the air pressure in the body, but the valve assemblies provided to date have been developed. There are several challenges with the assembly.

For example, in a seal mechanism using a general flap valve as disclosed in US Pat. No. 4,654,030 and US Pat. No. 4,943,280, the flap valve is always closed by a spring. Due to the bias in the direction, a corresponding force is required to open the flap valve through the surgical instrument through the cannula. Also, even after insertion, the lateral force from the flap valve acts on the surgical instrument, so that a corresponding force is required to move the surgical instrument in and out. During the operation, surgical instruments are frequently taken in and out, so that the operator is extremely burdened. In addition, there is a problem that the operability of the surgical instrument is also deteriorated because the lateral stress always acts.

Further, as described above, since a corresponding force is always applied to the flap valve in the closing direction, the flap valve and the surgical instrument are always in contact with each other, and the flap valve is damaged and airtightness is impaired. May be Also, during insertion, an inadvertent load is applied to the tip of the surgical instrument,
It is also possible that the surgical instrument is damaged. Some surgical instruments, such as forceps with electrodes that conduct electricity, have an outer peripheral surface covered with an insulating tube.In the case of such a surgical instrument, if the insulating tube is damaged, It is not preferable because the insulation property is not maintained.

Further, when the surgical instrument is inserted, the elastic member such as silicone rubber at the opening of the cannula which is provided in series with the flap valve in order to maintain the internal pressure of the body is also inserted through the surgical instrument. Since a load is applied, the elastic member may be broken due to the constant lateral load or insertion / removal of the device.

On the other hand, US Pat. No. 4,655,752, US Pat. No. 4,909,798 or JP-A-6-6-6.
In a cannula disclosed in Japanese Patent No. 3156, which has a valve structure consisting of only a sealing member made of an elastic material such as silicone rubber or a flexible material, a surgical instrument and a sealing surface come into direct contact with each other. When a surgical instrument having a sharp tip is taken in and out, the sealing member may be damaged or completely broken.

[0017] If a problem occurs in maintaining the internal pressure of the body by the valve mechanism during the operation, it is directly linked to the inability to secure the operation field, and this places a great burden on both the time and the patient. The above-mentioned problems are not limited to cannulas, but are common problems in general medical devices.

The present invention has been made in view of the above problems,
Medical instruments such as surgical instruments can be easily taken in and out, and can be prevented from damaging the medical instruments or damaging the sealing member when taking them in and out. An object of the present invention is to provide a valve structure of a medical device that can be used.

[0019]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a medical device having a pipe through which a medical instrument is inserted so that it can be inserted and removed, and a valve structure for opening and closing the pipe. A seal member made of an elastic material and serving as a one-way valve that can be opened from the entrance side of the medical device is provided in the conduit, and is protected on the entrance side of the medical device with respect to the seal member. The member is movably provided, and the protection member has a receiving portion for receiving the entry end of the medical device, and when the reception portion is pressed by the entry end of the medical device, the protection member replaces the sealing member. Opening to allow a medical device to penetrate the sealing member.

In a state where the medical device is not inserted, for example, when the internal pressure inside the body or the like is high, the pipe is closed by the seal member which is a one-way valve, and the internal airtightness is maintained. That pressure is maintained. When the medical device is inserted into the conduit and the valve structure is inserted, the entrance end of the medical device contacts the receiving portion of the protection member before reaching the seal member, and the protection member opens the seal member, The medical device allows the seal member to pass therethrough. Therefore, at the time of insertion, since the medical device does not directly push and open the seal member, the seal member is prevented from being damaged, and the airtight performance of the seal member is not deteriorated. Further, unlike the conventional flap valve, it is not biased by a spring in the closing direction, and the internal pressure and the self-sealing force due to the restoring force of the sealing member itself made of an elastic material act on the sealing member. I have. When the seal member is opened by the protective member, the internal pressure is reduced, so that the seal member can be easily opened without requiring a large force, so that the medical device can be easily taken in and out, and the medical device can be damaged. Can also be prevented.
Further, since a lateral stress from one specific direction does not act, the burden on the operator can be reduced without deteriorating operability.

Further, it is preferable that the protective member has a symmetrical structure with respect to the axis of the conduit. Thereby, the force received by the medical device can be made symmetrical about the axis by the protective member, and the operability of the medical device can be further improved.

The protection member may be a flap provided to be swingable in the pipeline. Since the flap does not need to be biased, it can be simply constructed.

The seal member may include a movable portion for receiving the protection member when the protection member is pressed against the entry end of the medical device. Thereby, when the receiving part of the protective member is pressed by the medical device and the protective member comes into contact with the seal member, the movable part of the seal member is moved, so that the seal member can be reliably opened.

It is preferable that at least the receiving portion of the protective member is made of a moderately soft material, and it is possible to prevent the medical device from being damaged when the entrance end of the medical device presses the receiving portion of the protective member. Therefore, moderately soft here
Hardness that is not damaged by insertion of a medical device. As specific hardness, durometer hardness D50
It is good to be the following. In addition, when at least the receiving portion of the protective member is made of a moderately hard material, the point of contact with the medical device can be minimized, and the sliding resistance when the medical device is taken in and out can be reduced. Here, “appropriately hard” refers to such a hardness that the protective member itself is not deformed by the medical device.

Preferably, the protection member prevents deformation of the seal member due to pressure from a side of the medical instrument opposite to the entrance. Thereby, when the function as the one-way valve of the seal member is likely to be lost, it can be prevented by the protection member. Further, since unintended deformation of the seal member is prevented by the protection member, the seal member can be made flexible. For example, a slit is formed at the tip of the sealing member in a conical shape that is convex on the tip,
When a one-way valve capable of opening the slit from the concave side is used, the protective member is provided on the concave side of the seal member, a plurality of pivotally disposed along the concave inner surface. It can be composed of flaps, and when each flap swings inward, the leading ends of the flaps come into contact with each other so that they can no longer swing, thereby preventing the reversal of the seal member. Can be.

[0026] In addition, it is preferable that a second seal member is provided in series with the seal member in close contact with the outer periphery of the inserted medical instrument. Thus, while the medical device is inserted through the seal member and the entry end of the medical device enters the inside to perform the operation, the airtightness inside is maintained by the second seal member. Since the second seal member can be prevented from acting on the second seal member via the medical device in the above-described lateral direction from one specific direction, the second seal member can be prevented from being damaged.

The above-described valve structure can be used for a medical device having any pipe, but can be used for a cannula, for example.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. The following embodiments do not limit the present invention. Further, in the description, a "surgical instrument" as a medical instrument is a forceps, a stapler, which can be inserted into and out of the cannula configured according to the present invention.
It represents a clip applicator or the like.

FIG. 1 is a perspective view showing a cannula 200 as a medical device to which the valve structure according to the embodiment of the present invention is applied, and FIG. 2 is an exploded perspective view of the cannula 200. The cannula 200 mainly includes a cannula housing 210, a cannula tube 204, a valve assembly 100, and a backup cap 150. The valve assembly 100 includes a seal packing 110, a flap assembly 125, and a seal valve 101.
The flap assembly 125 includes a packing holder 140, flaps 120 and 121, and a flap holder 130.

The valve assembly 100 incorporates a seal valve 101 as a seal member for maintaining airtightness and a seal packing 110 as a second seal member. The two members, the seal valve 101 and the seal packing 110, are preferably made of an elastic member such as rubber, and are preferably made of a material such as silicone rubber. The seal valve 101
It mainly serves as a seal mechanism for maintaining airtightness when various surgical instruments are detached. The seal packing 110 serves as a seal mechanism for maintaining airtightness when a surgical instrument is inserted. And have
Roles are divided. Hereinafter, the seal valve 101 and the seal packing 110 will be described in detail.

As shown in FIG. 3, the seal valve 101
Is formed in a substantially cup shape, and a slit 102 for penetrating a surgical instrument is provided on a bottom surface of the cup shape. In the illustrated example, the number of slits 102 is one, and the cup-shaped portion has a trapezoidal shape in the cross-sectional view of FIG. 3B and a triangular shape in the cross-sectional view of FIG. Two substantially planar movable portions 105, 105 that are inclined to approach each other toward the slit 102 are formed corresponding to the two flaps 120, 121. The seal valve 101 is configured such that the slit 102 is automatically closed by the self-sealing property generated by the restoring force of the elastic material, that is, the movable portions 105 and 1 are closed.
05 are constantly urged in a direction in which their tips adhere to each other, and the slit 102 opens in a state where the pressure of the cup-shaped concave side is somewhat higher than that of the convex side. On the other hand, when the pressure on the convex side is higher than that on the concave side, the slit 102 is a one-way valve that closes. A thick flange 103 is formed at the cup-shaped end so that the seal valve 101 is securely disposed in the cannula housing 210, and an outer peripheral surface of the flange 103 is provided with a cannula housing 210. Two fixing ribs 104 are provided in the radial direction so as to be 180 ° apart from each other in the circumferential direction for fixing.

The slit 1 of the seal valve 101
The number of the slits 102 is not limited to one as in the example of FIG. 3, and three or other numbers of slits 102 ′ as shown in FIG. 4 can be formed. However, in order to maintain perfect airtightness, it is desirable to set the number of slits in a range of 1 to 3. Also, as shown in FIG. 3, the number of movable parts 105 does not necessarily have to correspond to the number of flaps.
It is desirable that the number of the movable parts is equal to one.

The seal packing 110 shown in FIG. 5 is simply formed in a disk shape, and has a center hole 111 formed at the center thereof, through which a surgical instrument can be inserted. Center hole 11
1 has an inner diameter slightly smaller than the outer diameter of the surgical instrument used.

Next, FIG. 6 shows a flap 1 as a protection member of a flap assembly 125 incorporated in the valve assembly 100.
20, 121 are shown. The two flaps 120 and 121 have the same shape. The cylindrical portion 122 formed at the base end is a portion pivotally attached to the flap holder 130, and the two flaps can swing about the cylindrical portion 122. Further, an inclined surface 123 is formed at a free end opposite to the cylindrical portion 122, and the inclined surface 1
The center in the width direction of the tip of 23 further extends to the tip, and the tip is a rounded tip 124. The inclined surface 123 is a receiving portion that directly contacts the ingress end of the surgical instrument when the surgical instrument is inserted into the cannula, and the distal end portion 124 is a portion that directly contacts the seal valve 101. The tip 124 has a rounded shape so that the seal valve 101 is not damaged.

The material of the flaps 120 and 121 is not particularly limited. However, in order to protect the tip of the inserted surgical instrument, it is preferable to use an elastic material or a soft material instead of a very hard material. More preferably, JIS
The durometer hardness D50 or less specified in K6253 or K7215 is preferred, and more preferably A60 or less. Specifically, various rubber elastic materials such as silicone rubber, butadiene rubber, ethylene / propylene rubber, styrene-based, urethane-based, polyester-based, olefin-based thermoplastic elastomers, high-pressure polyethylene, linear low-density polyethylene, etc. A soft material such as a polyethylene or polypropylene copolymer can be used.

FIG. 7 is an exploded perspective view of the flap assembly 125, and FIG. At the center of one surface of the flap holder 130 having a substantially disk shape, a recess 134 is formed, which is one step thinner through a step.
The two flaps 1 are arranged radially inward of the recess 134.
Grooves 13 for accommodating cylindrical portions 122 of 20, 121
1 is formed symmetrically. The groove 131 is formed in a semicircular cross section so that the cylindrical portion 122 rotates smoothly in the groove 131. Further, a center hole 132 for inserting a surgical instrument is formed on the center side of the groove 131. Further, two fixing ribs 133 for fitting to the cannula housing 210 are provided on the outer peripheral surface of the flap holder 130 so as to project in the radial direction at 180 ° apart in the circumferential direction. After arranging the two flaps 120 and 121 in the flap holder 130, the recess 134 and the center hole 132 of the flap holder 130 are formed.
Then, a packing holder 140 formed so as to fit tightly is fitted. That is, the entire outer diameter of the disc-shaped packing holder 140 corresponds to the inner diameter of the concave portion 134 of the flap holder 130, and one surface thereof has a convex portion 14 that fits into the central hole 132.
1 is formed. Further, a center hole 142 through which a surgical instrument can be inserted is formed in the center of the packing holder 140.

As shown in FIG. 8, the flap assembly 125
In the state where the assembly is completed, the respective cylindrical portions 122 of the flaps 120 and 121 are arranged in the respective groove portions 131 of the flap holder 130, and the upper portions thereof are closed by the packing holder 140. Flaps 120, 1
The cylindrical portion 122 of the cannula 20 is simply disposed in the groove 131 and can be used without using any special fixing means.
When it is fixed in 0, it does not come off from the groove 131. In addition, the two flaps 120 and 121 do not move inward beyond the position shown in the figure in the closing direction because the inclined surfaces 123 are in contact with each other. Regarding the opening direction, the opening can be made at least beyond the central axis of the cannula 200, that is, beyond the angle at which the surgical instrument can be inserted.

In the examples shown in FIGS. 6 to 8, the flaps are composed of two flaps.
It is also possible to configure the flap with three flaps, and there may be no more than three flaps. However, in order for the inserted surgical instrument to be aligned with the center of the cannula, two or more configurations are desirable, and it is particularly desirable that the arrangement of the flaps be point-symmetrical with respect to the central axis of the cannula. . Further, the shape of the flap may be a columnar shape, a triangular shape, or any other shape in addition to the plate shape shown in FIG.
(A) (b)). Further, as shown in FIG. 9C, a plurality of flaps can be integrally formed.

FIG. 10 shows the cannula housing 210 in which the valve assembly 100 is incorporated and the cannula tube 204. On the side of the cannula housing 210,
Blow valve 201, the only guide between inside and outside the body
The blow valve 201 has a connection / connection between the inside and outside of the body in order to adjust the insufflation pressure in the body and to remove smoke and the like generated inside the body by using an electric scalpel.
A switching lever 202 for switching between non-connections is provided. Further, a pair of handles 205 are provided on the outer peripheral surface of the cannula housing 210 for improving operability.
On the inner peripheral surface, two concave portions 211 for fixing the seal valve 101 and the flap assembly 125 in the cannula housing 210 are formed 180 ° apart in the circumferential direction. A female screw (not shown) is formed at the rear end (upper side in FIG. 10) of the inner peripheral surface of the cannula housing 210, and the front end (lower side in FIG. 10) of the cannula housing 210 is formed. , The upper end of the cannula tube 204 is removably inserted.

As shown in FIG. 11, the disk-shaped backup cap 150 has a center hole 152 formed in the center thereof, and has one surface (FIG. 11A). The periphery of the central hole 152 has a tapered surface 155 for smoothly inserting and removing the surgical instrument. Further, a pair of operation units 153 is provided on the radially outer side of the tapered surface 155. The outer peripheral surface is cut with an uneven thread portion 151, which can be screwed with a female thread portion on the inner peripheral surface of the cannula housing 210. Also, seal packing 110
The other surface (FIG. 11 (b)) serving as a contact surface with
A plurality of annular ribs 154 having different diameters are provided.

To arrange and arrange the valve assembly 100 including the seal valve 101, the seal packing 101, and the flap assembly 125 in the cannula housing 210, as shown in FIG.
First, the seal valve 101 is connected to the cannula housing 21.
Place within 0. Two concave portions 211 are formed in the inner peripheral surface of the cannula housing 210 at a distance of 180 ° in the circumferential direction, and the fixing rib 104 of the seal valve 101 is formed.
By fitting (FIG. 3) into this recess 211,
Position seal valve 101 within cannula housing 210.

Next, the flap assembly 125 is inserted into the cannula housing 210. Flap assembly 125
Similarly to the seal valve 101, the fixing rib 133 is provided.
(FIGS. 7 and 8) are positioned within cannula housing 210 by fitting them into the same recess 211 in said cannula housing 210, thus sealing valve 101 and flap assembly 125 are coupled to flaps 120, 121. Are the movable part 105 of the seal valve 101,
105 are matched.

Next, the seal packing 110 shown in FIG.
Insert The outer diameter of the seal packing 110 is approximately the same size as the inner diameter of the cannula housing 210 and simply rests on the flap assembly 125 and fits within the cannula housing 210.

After the seal valve 101, the flap assembly 125, and the seal packing 110 are disposed in the cannula housing 210, the operation portion 153 of the backup cap 150 shown in FIG. The above components are completely fixed in the cannula housing 210 by being screwed and fastened to the female screw portion of the 210. At this time, the annular rib 154 of the backup cap 150 bites into the seal packing 110 so that the seal packing 110
To prevent misalignment and bending. Thus, the cannula 200 incorporating the valve assembly 100 is completed.

As shown in FIG. 13, a trocar obturator 300 is usually inserted into the cannula 200 in advance, and the cannula 200 and the trocar obturator 300 constitute a trocar assembly. Therefore, release button 20 for fixing trocar obturator 300 and cannula 200 is used.
3a, 203b are provided on the side of the cannula housing 210. The distal end of the trocar obturator 300 is provided with a sharp puncture portion 301.

The operation of the valve assembly 100 of the cannula 200 according to the present invention having the above-described configuration will be described below together with the method of using the same. In endoscopic surgery such as a laparoscope, first, at the time of insertion into the body, the body wall is punctured by the puncturing portion 301 of the trocar obturator 300 in a state where the cannula 200 and the trocar obturator 300 are integrated, The cannula tube 204 is inserted into the body. After the puncture, the trocar obturator 300 is inserted into the cannula 20.
Removed from zero, only the cannula 200 remains, forming a guide between the body and the outside. Then, the surgical instrument is inserted into or taken out of the body through the guide cannula 200. After the initial incision, the body is exposed to CO ₂ at a constant pressure (usually 8-12 mmHg).
Gas is introduced and the valve assembly 1 of the cannula 200 is
00 maintains the internal air pressure when the surgical instrument is inserted and when the surgical instrument is not inserted.

That is, referring to FIGS. 14 and 15, when the surgical instrument is not inserted, the internal pressure of the body is maintained by the seal valve 101 of the valve assembly 100. As described above, since the internal pressure of the body is normally maintained at a constant pressure of 8 to 12 mmHg, a very high pressure is applied, so that the seal valve 101 naturally receives pressure from the body. Therefore, since the slit 102 is automatically closed by the pressure from the cup-shaped convex side, the conduit of the cannula 200 is closed, the body is completely sealed, and the air pressure in the body is maintained. At this time, since the flaps 120 and 121 are not biased by a spring or the like, they are in a natural state where only gravity acts, and are in contact with the cup-shaped concave side of the seal valve 101. However, the seal valve 10
Due to the body pressure and self-sealing force acting on
The seal valve 101 does not open due to the weight of 20, 121. Also, when the internal pressure becomes excessive and the cup-shaped convex portion of the seal valve 101 is likely to be pushed outward and warped to become concave, the inclination of the flaps 120 and 121 relative to each other is increased. The surfaces 123 come into contact and the flaps 120, 121 cannot swing further inward, preventing further reversal of the seal valve 101. Thus, the unintended deformation of the seal valve 101 can be prevented by the flaps 120 and 121.

Now, an elongated object, such as a surgical instrument 220 as shown in FIG. 16, is inserted into valve assembly 100 in an attempt to penetrate cannula 200 to perform the desired diagnostic procedure and / or operation. Then, the surgical instrument 22
0 is at the beginning of the inclined surface 1 of the flaps 120 and 121.
Touch 23. Further advancement of the surgical instrument 220 causes the cams of the inclined surfaces 123 to swing the flaps 120 and 121 so that the tips 124 formed on the flaps 120 and 121 spread more outward. The distal end portion 124 comes into contact with the movable portion 105 of the seal valve 101 installed below, and pushes the movable portion 105 apart. Thus, the slit 102 is opened, and the surgical instrument 220 can be inserted through the slit 102 of the seal valve 101 without any contact with the seal valve 101. Thus, the surgical instrument 220
Can pass through the seal valve 101 with little or no contact with the seal valve 101, so that the seal valve 101 is not damaged, and therefore the airtight performance of the seal valve 101 is not deteriorated.
In addition, since the sliding resistance from the seal valve 101 is not received, the surgical instrument 220 can be easily inserted.
When expanding the flaps 120 and 121, the flaps 12
Since 0 and 121 themselves are not biased by a spring or the like,
The flaps 120, 121 can be moved with a light force. Furthermore, when the slit 102 opens even a little through the flaps 120 and 121, the pressure in the body is reduced, so that the slit 102 can be expanded with a lighter force,
The surgical instrument 220 is not damaged.

Once the surgical instrument 220 is
After passing through the slit 102 of No. 01, the central hole 111 of the seal packing 110 is in close contact with the outer peripheral surface of the surgical instrument 220 to be inserted, so that the airtightness in the body is maintained.
Since the surgical instrument 220 does not receive a lateral stress from one specific direction, the operability is not deteriorated, and the burden on the operator can be reduced.

When the surgical instrument 220 is pulled out, the operation opposite to that at the time of insertion is performed. In this case as well, the surgical instrument 220 may pass through the slit 102 without contacting the seal valve 101. Because it is possible, seal valve 1
01 and the surgical instrument 220 can be easily removed without damaging or receiving sliding resistance from the seal valve 101.
After passing through 2, the seal valve 101 is closed again by the self-sealing property of the seal valve 101, and the airtightness in the body is maintained.

As described above, since there is no possibility that the seal valve 101 is damaged and the reversal phenomenon such as warpage is prevented by the flaps 120 and 121, a soft material can be used for the seal valve 101.
Furthermore, a self-sealing type seal valve 10 by a restoring force.
By using No. 1, components such as springs can be dispensed with, and manufacturing costs can be reduced.

The above operation has been described with respect to the case where the surgical instrument is inserted into and removed from the cannula 200. However, when the trocar obturator 300 is inserted into the cannula 200, and when the trocar obturator is inserted to form a trocar assembly. The same operation and effect can be obtained when the trocar obturator 300 is removed after the puncture of the body wall by the child 300.
In particular, a sharp puncturing portion 300 is provided at the distal end of the trocar obturator 300. When the puncturing portion 300 comes into contact with the seal valve 101, the seal valve 101 may be damaged. , Such a situation can be prevented.

[0053]

As described above, according to the present invention, when inserting a medical instrument, it is not necessary for the medical instrument to directly push and open the seal member, thereby preventing the seal member from being damaged, It does not degrade the airtight performance of the seal member. Further, since the seal member is not urged by the spring in the closing direction unlike the conventional flap valve, the seal member can be easily opened without requiring a large force, and therefore, the medical instrument can be easily taken in and out. Further, since a lateral stress from one direction does not act, the burden on the operator can be reduced without deteriorating the operability.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a cannula as a medical device to which a valve structure according to an embodiment of the present invention is applied.

FIG. 2 is an exploded perspective view of the cannula of FIG.

3A is a perspective view of a seal valve, FIG. 3B is a cross-sectional view taken along line bb of FIG. 3A, and FIG.
FIG. 5 is a cross-sectional view taken along line cc of FIG.

FIG. 4A is a perspective view illustrating another example of the seal valve.
(B) is sectional drawing seen along the bb line of (a).

FIG. 5 is a perspective view of a seal packing.

FIGS. 6A to 6C are perspective views of a flap, and FIG. 6D is a side view.

FIG. 7 is an exploded perspective view of the flap assembly.

FIG. 8 is an assembled view of the flap assembly.

FIGS. 9A to 9C are perspective views each showing another example of a flap.

FIG. 10 is an exploded perspective view of a cannula housing and a cannula tube.

11A is a perspective view of the backup cap as viewed from one surface, and FIG. 11B is a perspective view of the backup cap as viewed from the other surface.

FIG. 12 is a perspective view showing a procedure for assembling a cannula.

FIG. 13 is a side view showing a trocar assembly in which a trocar obturator is incorporated in a cannula.

FIG. 14 is a cross-sectional view showing a state where a cannula tube is inserted into a body and a surgical instrument is not inserted.

FIG. 15 is a cross-sectional view of FIG. 14 rotated 90 degrees around the axis of the pipeline.

FIG. 16 is a cross-sectional view showing a state in which a cannula tube is inserted into a body and a surgical instrument is inserted.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Valve assembly 101 Seal valve (seal member) 110 Seal packing (second seal member) 120, 121 Flap (protection member) 123 Inclined surface (receiving part) 200 Cannula (medical tool) 220 Surgical instrument (medical instrument)

Claims (9)

[Claims] 1. A valve structure provided on a medical device having a conduit through which a medical device is inserted so as to be able to enter and exit, and a valve structure for opening and closing the conduit, the valve structure being made of an elastic material, being opened from an entrance side of the medical device. A seal member which is a one-way valve capable of being provided is provided in the conduit, and a protection member is movably provided on the entrance side of the medical device with respect to the seal member, and the protection member is provided for the medical device. A receiving portion for receiving the entry end, wherein when the receiving portion is pressed by the entry end of the medical device, the protection member opens the seal member and allows the medical device to penetrate the seal member; A valve structure for a medical device, comprising: 2. The valve structure for a medical device according to claim 1, wherein the protection member has a symmetrical structure with respect to an axis of the conduit. 3. The valve structure for a medical device according to claim 1, wherein the protection member is a flap provided to be swingable in a pipeline. 4. The medical device according to claim 3, wherein the seal member includes a movable portion that receives the protection member when the receiving portion of the protection member is pressed against the entry end of the medical device. Valve structure. 5. The valve structure for a medical device according to claim 1, wherein at least a receiving portion of the protection member is made of a soft material. 6. The hardness of a receiving portion of the protection member is not more than a durometer hardness D50.
The valve structure of the medical device as described in the above. 7. The medical device according to claim 1, wherein the protection member prevents deformation of the seal member due to pressure from a side of the medical device opposite to the entrance of the medical device. Valve structure. 8. The medical device according to claim 1, wherein a second seal member is provided in series with the seal member in close contact with an outer periphery of the inserted medical device. The valve structure of the medical device as described in the above. 9. A cannula in which the valve structure according to claim 1 is incorporated.