Trocar valve mechanism

Abstract

To provide a valve mechanism of a trocar capable of improving airtightness.SOLUTION: A valve mechanism 10 of a trocar 1 includes a first valving element 11 and a second valving element 12, having four abutment parts 11b divided by four breaks 11c. At a withdrawal time of a medical appliance 4, the first valving element 11 abuts, in the airtight state, on the outer peripheral surface of the medical appliance 4 by the four abutment parts 11b, and the second valving element 12 is pressed and evacuated by the medical appliance 4, to thereby open the breaks 11c.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a valve mechanism for a trocar that maintains an airtight state between a medical instrument and the trocar when the medical instrument is inserted or removed. [Background technology]

[0002] A conventional valve mechanism for a trocar is described in Patent Document 1. This valve mechanism maintains an airtight state between a medical instrument and the trocar when the medical instrument is inserted or removed from the trocar while the trocar is attached to the human body, and includes a first valve body and a second valve body. The first valve body is provided in the head of the trocar and has a circular hole. The second valve body is located adjacent to the first valve body and on the opposite side of the first valve body from the insertion port for the medical instrument.

[0003] In this valve mechanism, when a medical instrument is inserted into or removed from a trocar, the edge of the circular hole in the first valve body abuts against the medical instrument, maintaining an airtight state between the medical instrument and the trocar. When a medical instrument is not inserted into the trocar, the second valve body closes the circular hole in the first valve body, ensuring airtightness and preventing leakage of the gas stored inside the body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-126514 Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, according to the conventional valve mechanism, the first valve body can ensure airtightness when inserting and withdrawing a medical instrument into and from a trocar, but it is desired to further improve the airtightness.

[0006] The present invention has been made to solve the above problems, and an object of the present invention is to provide a valve mechanism for a trocar that can improve airtightness. [Means for solving the problem]

[0007] In order to achieve the above object, the invention of claim 1 provides a valve mechanism for a trocar that maintains an airtight state between a medical instrument and a trocar when the medical instrument is inserted into or removed from the trocar, the valve mechanism being flexible and protruding from the inner wall of the trocar and arranged to close at least a part of the inner hole of the trocar, the valve mechanism having a hole formed in the center when viewed from the insertion / removal direction of the medical instrument, and a plurality of abutment portions divided into a plurality of parts by slits extending radially from the edge of the hole. and and a first valve body that comes into airtight contact with the outer circumferential surface of the medical instrument by a plurality of contact portions when the medical instrument is inserted or removed, and a flexible plate-like second valve body that is disposed adjacent to the first valve body and deeper than the first valve body, and that normally comes into contact with the rear surface of the first valve body to close the slit, and that is pushed by the medical instrument to retract and open the slit when the medical instrument is inserted, The thickness of the contact portion of the first valve body is configured to be smaller than the thickness of the portion other than the contact portion, and the surface of the first valve body facing the second valve body is recessed by being thinned so that the contact portion is spaced apart from the second valve body. It is characterized by do.

[0008] According to this trocar valve mechanism, when a medical instrument is inserted or removed from the trocar, the first valve body expands the slit and elastically deforms due to the medical instrument, and the multiple abutment portions abut against the outer circumferential surface of the medical instrument in a surface-to-surface contact manner. This ensures a larger contact area than conventional cases in which the edge of the circular hole in the first valve body abuts against the medical instrument, thereby improving airtightness between the medical instrument and the trocar. Furthermore, since the flexible second valve body normally abuts against the back surface of the first valve body, closing the slit in the first valve body, when the trocar is attached to the human body and filled with gas, the pressure of the gas acts to press the second valve body against the back surface of the first valve body. As a result, airtightness is ensured and gas leakage is prevented. Note that the term "slit" as used herein is not limited to a slit with no gap between its edges, but also includes a slit with a gap between its edges.

[0009] In the present invention, The slit of the first valve body is made up of a plurality of slits, and the plurality of slits are formed so that the angles between them are the same when viewed from the insertion / removal direction of the medical instrument. It is preferable.

[0010] With this trocar valve mechanism, when a medical instrument is inserted into or removed from the trocar, the multiple contact portions of the first valve body elastically deform and come into surface contact with the medical instrument over an equal area, thereby ensuring high airtightness between the trocar and the medical instrument.

[0011] In the present invention, the thickness of the contact portion of the first valve body is configured to be smaller than the thickness of the portion other than the contact portion. are.

[0012] The valve mechanism of this trocar ensures that the abutment portion of the first valve body has greater flexibility than the portions other than the abutment portion, thereby ensuring high airtightness between the trocar and the medical instrument. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a front view showing the appearance of a trocar equipped with a valve mechanism according to one embodiment of the present invention. FIG. [Figure 2] FIG. 1 is a perspective view from above showing the appearance of a trocar. [Figure 3] FIG. 1 is a perspective view from below showing the appearance of a trocar. [Figure 4] FIG. 3 is a cross-sectional view taken along line II in FIG. 2. [Figure 5] FIG. 3 is a cross-sectional view of the first valve body. [Figure 6] FIG. 2 is a plan view of the first valve body. [Figure 7] FIG. 4 is a bottom view of the first valve body. [Figure 8] FIG. 4 is a plan view of the second valve body. [Figure 9] 10A and 10B are cross-sectional views showing the operation of the valve mechanism when a medical instrument is inserted. [Figure 10] FIG. 10 is a diagram showing a state in which the second valve body is normally in an open position. [Figure 11] FIG. 10 is a bottom view showing a modified example of the first valve body. [Figure 12] FIG. 10 is a bottom view showing another modified example of the first valve body. [Figure 13] FIG. 10 is a bottom view showing another modified example of the first valve body. [Figure 14] FIG. 10 is a bottom view showing another modified example of the first valve body. [Figure 15] FIG. 10 is a bottom view showing another modified example of the first valve body. [Figure 16] FIG. 10 is a bottom view showing another modified example of the first valve body. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, a valve mechanism for a trocar according to one embodiment of the present invention will be described with reference to the drawings. As shown in Figures 1 to 4, the valve mechanism 10 of this embodiment is applied to a trocar 1, which is used to insert a medical instrument (e.g., a laparoscope) into the human body during laparoscopic surgery in a medical setting. In the following description, for convenience, the upper side of Figure 1 will be referred to as "upper" and the lower side will be referred to as "lower."

[0015] The trocar 1 is a hollow tube made of synthetic resin (e.g., polycarbonate) and integrally comprises an insertion tube section 2 and a head section 3. During surgery, the insertion tube section 2 is inserted into an attachment hole of a port (not shown) attached to the human body, and is thereby inserted into the abdominal cavity. The insertion tube section 2 is formed in a hollow tube shape and has an open lower end so that a medical instrument (see figure) can be passed through it.

[0016] The head portion 3 is provided continuously with the upper end portion of the insertion tube portion 2, and includes an inner cylinder portion 3a and an outer cylinder portion 3b, as shown in Fig. 4. The inner cylinder portion 3a is cylindrical and formed integrally with the insertion tube portion 2, and has nine pins 3f (only one is shown) on its upper end surface.

[0017] Each of these pins 3f protrudes upward, and two pins 3f pass through pin holes 12b of the second valve body 12 described later and engage with pin holes 11d of the first valve body 11 described later, while the remaining seven pins 3f engage with pin holes 11d of the first valve body 11.

[0018] Furthermore, an air vent 3c is integrally formed with the inner cylinder 3a. This air vent 3c is formed in a hollow cylindrical shape and protrudes laterally from the inner cylinder 3a, with its inner hole communicating with the inner hole of the insertion tube 2. During laparoscopic surgery or the like, a tube (not shown) is connected to this air vent 3c, which allows gas to flow into or out of the abdominal cavity.

[0019] On the other hand, the outer cylinder 3b is cylindrical with an inner diameter slightly larger than the outer diameter of the inner cylinder 3a, and is fitted onto the inner cylinder 3a from above. An O-ring 3g is inserted between the outer cylinder 3b and the inner cylinder 3a, and this O-ring 3g maintains an airtight state between them.

[0020] The outer tube portion 3b has an upper opening which serves as an insertion / removal opening 3d for inserting and removing a medical instrument, and a pressing portion 3e is formed on the lower surface of the edge of the insertion / removal opening 3d. The cross section of this pressing portion 3e is formed in a downwardly convex semicircular shape.

[0021] The valve mechanism 10 also includes a first valve body 11 and a second valve body 12, which are fixed integrally to the head portion 3.

[0022] 5 to 7, the first valve body 11 is a disk-shaped flexible member made of synthetic rubber (such as silicone rubber) and includes an attachment portion 11a and four contact portions 11b.

[0023] The mounting portion 11a is formed in an annular shape around the entire outer end of the first valve body 11, with the portion closer to the inner periphery being thinner than the portion closer to the outer periphery. As shown in Fig. 7, nine round pin holes 11d are provided on the underside of the mounting portion 11a so as to be arranged concentrically at equal intervals.

[0024] The first valve body 11 is held between the outer cylinder 3b and the inner cylinder 3a together with the second valve body 12 in an elastically deformed state with the pin 3f of the head portion 3 fitted into the pin hole 11d of the attachment portion 11a and pressed from above by the pressing portion 3e. As a result, the first valve body 11 and the second valve body 12 are fixed to the head portion 3 in a non-detachable state.

[0025] The four contact portions 11b are formed in a thin plate shape and extend integrally from the inner end of the mounting portion 11a. Slits 11c are formed between two adjacent contact portions 11b, 11b, and these slits 11c extend outward from the center of the first valve body 11 and are provided in a cross shape in a plan view. In other words, the four contact portions 11b are divided into four equal parts by the four slits 11c.

[0026] On the other hand, the second valve body 12 is made of flexible synthetic rubber (for example, silicone rubber) and is formed in a thin plate shape. As shown in Fig. 8, one end of the second valve body 12 is an attachment portion 12a, and this attachment portion 12a is provided with two pin holes 12b, 12b.

[0027] The second valve body 12 is sandwiched together with the first valve body 11 by the outer cylindrical portion 3b and the inner cylindrical portion 3a, with the pins 3f of the head portion 3 passing through the pin holes 12b and fitted into the pin holes 11d of the first valve body 11. As a result, the upper surface of the second valve body 12 is normally in close surface contact with the lower surface of the first valve body 11, and is maintained in a state in which the slit 11c is closed (see FIG. 4). The end of the second valve body 12 opposite the mounting portion 12a is a free end portion 12c, which is formed in an arc shape.

[0028] Next, the operation of the valve mechanism 10 of this embodiment configured as described above will be described. In the case of this valve mechanism 10, as shown in Figure 4, under normal circumstances, i.e., when a medical instrument is not inserted, the upper surface of the second valve body 12 abuts against the lower surface of the first valve body 11, closing the slit 11c of the first valve body 11. This keeps the interior of the trocar 1 airtight.

[0029] 9, when the medical instrument 4 is inserted into the trocar 1, the four contact portions 11b of the first valve body 11 expand along the slits 11c and bend downward, contacting the entire outer periphery of the medical instrument 4. As a result, when the medical instrument 4 is inserted into the trocar 1, the first valve body 11 maintains an airtight state between the medical instrument 4 and the trocar 1 to prevent gas from escaping from the abdominal cavity.

[0030] At the same time, the second valve body 12 is pushed by the medical instrument 4 and bends downward, opening the slit 11c of the first valve body 11 and coming into contact with the outer peripheral surface of the medical instrument 4.

[0031] Conversely, when the medical instrument 4 is removed from the trocar 1, the contact portion 11b of the first valve body 11 bends upward and contacts the entire outer periphery of the medical instrument 4 (not shown). As a result, when the medical instrument 4 is removed from the trocar 1, the first valve body 11 maintains an airtight state between the medical instrument 4 and the trocar 1 to prevent gas from escaping from the abdominal cavity.

[0032] When the medical instrument 4 is completely removed from the trocar 1, the first valve body 11 and the second valve body 12 return to the state shown in Figure 4. At that time, the pressure of the gas filled in the abdominal cavity acts on the second valve body 12, pressing the second valve body 12 toward the first valve body 11, and functioning as a one-way valve, the inside of the trocar 1 is kept airtight.

[0033] If the medical instrument 4 is inserted into the trocar 1 for a long period of time during surgery, the second valve body 12 may develop a bent tendency. As shown in Figure 10, the free end 12c of the second valve body 12 may remain slightly drooping, not contacting the first valve body 11 and not closing the slit 11c of the first valve body 11. In this embodiment, even in this state, when the medical instrument 4 is completely removed from the trocar 1, the pressure of the gas filled in the abdominal cavity acts on the second valve body 12, pressing it toward the first valve body 11 and functioning as a one-way valve. This maintains the interior of the trocar 1 in an airtight state.

[0034] More specifically, in this embodiment, the insertion hole for the medical instrument 4 in the first valve body 11 is formed by the slit 11c, so that even in the state shown in Fig. 10, the flow of gas that enters the gap between the upper surface of the second valve body 12 and the lower surface of the first valve body 11 and flows out of the body through the insertion hole in the first valve body 11 is suppressed. As a result, in this embodiment, the movement of the second valve body 12 toward the first valve body 11 is not hindered by the gas flow between the second valve body 12 and the first valve body 11, so that the gas pressure in the abdominal cavity can reliably press the second valve body 12 against the first valve body 11 to bring them into close contact.

[0035] Furthermore, in this embodiment, the second valve body 12 is configured to directly contact the first valve body 11, so the volume of the gap that can occur between the upper surface of the second valve body 12 and the lower surface of the first valve body 11 is small, and a small amount of gas leaking from the slit 11c easily creates a pressure difference between the upper and lower surfaces of the second valve body 12. As a result, in this embodiment, the second valve body 12 can be quickly moved toward the first valve body 11 and reliably brought into close contact with the first valve body 11.

[0036] In this way, in this embodiment, by appropriately combining the first valve body 11 having the slit 11c as an insertion hole for the medical device 4 with the second valve body 12 which is a flap valve, the two act synergistically, making it possible to further improve the occlusion properties of the valve mechanism 10.

[0037] In addition, in this embodiment, by recessing the underside of the abutting portion 11b, the adhesion between the first valve body 11 and the second valve body 12 is not impaired even if the abutting portions 11b get caught on each other and do not return to their original state after the medical device 4 is removed. Moreover, because the first valve body 11 and the second valve body 12, both of which are made of elastic materials, are brought into direct contact with each other, they are pressed by the gas pressure in the abdominal cavity and deform appropriately, thereby further improving the adhesion.

[0038] As described above, according to the valve mechanism 10 of the trocar 1 of this embodiment, when the medical device 4 is inserted into or removed from the trocar, the four abutment portions 11b of the first valve body 11 expand along the slits 11c and bend downward or upward, and abut in a surface contact state around the entire outer surface of the medical device 4.

[0039] This ensures a larger contact area between the first valve body 11 and the medical instrument 4 compared to when the edge of the round hole of the first valve body abuts against the medical instrument as in Patent Document 1, thereby further improving the airtightness between the medical instrument 4 and the trocar 1.

[0040] Furthermore, when the trocar 1 is attached to the human body and the human body is filled with gas, the pressure of the gas acts to press the second valve body 12 against the back surface of the first valve body 11. As a result, even if the second valve body 12 does not abut the first valve body 11 due to aging or other reasons, as described above, when the trocar 1 is attached to the human body and the human body is filled with gas, the pressure of the gas will act to press the second valve body 12 against the back surface of the first valve body 11. As a result, airtightness can be ensured and gas leakage can be prevented.

[0041] In the case of the first valve body 11, the four contact portions 11b are divided into four equal parts by the four slits 11c. As a result, when the medical instrument 4 is inserted into or removed from the trocar 1, the four contact portions 11b elastically deform and come into surface contact with the medical instrument 4 over an equal area. Furthermore, the contact portions 11b of the first valve body 11 are thinner than the attachment portion 11a, ensuring greater flexibility than the attachment portion 11a. As a result, high airtightness can be ensured between the trocar 1 and the medical instrument 4.

[0042] In the embodiment, the first valve body 11 has four contact portions 11b. Alternatively, first valve bodies 11A to 11F as shown in FIGS. 11 to 16 may be used.

[0043] For example, in the case of the first valve body 11A shown in Fig. 11, the multiple abutment portions include two abutment portions 11b, 11b that are semicircular in plan view, and a linear slit 11e is formed between these two abutment portions 11b, 11b. This slit 11e corresponds to two slits extending outward from the center of the first valve body 11A, connected in a straight line. Even with this configuration, the same effects as those of the first valve body 11 of the embodiment can be obtained.

[0044] 12, the first valve body 11B has three contact portions 11b as the multiple contact portions, and gaps 11f are formed between adjacent contact portions 11b. These three gaps 11f extend outward from the center of the first valve body 11B, and are spaced apart at an angle of 120° in plan view. Even with this configuration, the same effects as those of the first valve body 11 of the embodiment can be obtained.

[0045] 13, the first valve body 11C includes five contact portions 11b as the plurality of contact portions, and gaps 11g are formed between adjacent contact portions 11b. These five gaps 11g extend outward from the center of the first valve body 11C, and are spaced apart at an angle of 72° in plan view. Even with this configuration, the same effects as those of the first valve body 11 of the embodiment can be obtained.

[0046] 14, the first valve body 11D has six contact portions 11b as the plurality of contact portions, and gaps 11h are formed between adjacent contact portions 11b. These six gaps 11h extend outward from the center of the first valve body 11, and are spaced at an angle of 60° from one another in a plan view. Even with this configuration, the same effects as those of the first valve body 11 of the embodiment can be obtained.

[0047] On the other hand, the first valve body 11E shown in FIG. 15 has four contact portions 11b as the multiple contact portions, and four slits 11i in the shape of a cross in plan view are formed between adjacent contact portions 11b, 11b. Each of these four slits 11i extends outward from the center, and its width decreases as it moves outward from the center. In other words, the spacing between the edges of adjacent contact portions 11b, 11b is configured to increase as it moves from the outside toward the center. Even with this configuration, the same effects as those of the first valve body 11 of the embodiment can be obtained.

[0048] 16, the first valve body 11F includes four contact portions 11b as the plurality of contact portions, and four cross-shaped slits 11j are formed between adjacent contact portions 11b, 11b in a plan view. Furthermore, the tips of the four contact portions 11b are arc-shaped, thereby forming a hole 11k that is circular in a plan view in the center of the first valve body 11F. Even with this configuration, the same effects as those of the first valve body 11 of the embodiment can be obtained. The shape of the hole 11k is not limited to a circular shape in a plan view, and may be a polygonal or elliptical shape in a plan view.

[0049] The number of slits in the first valve body 11 is not limited to the above 2 to 6, but may be 7 or more. [Explanation of symbols]

[0050] 1 trocar 4 Medical equipment 10 Valve mechanism 11 First valve body 11a Mounting portion (portion other than the contact portion) 11b Contact part 11c Break 11e Break 11f Break 11g cut 11h break 11i Break 11j Break 12 Second valve body

Claims

1. A valve mechanism for a trocar that maintains an airtight state between a medical instrument and the trocar when the medical instrument is inserted into or removed from the trocar, a first valve body that protrudes from the inner wall of the trocar and is provided so as to close at least a portion of the inner hole of the trocar, is flexible, and has a hole formed in the center when viewed from the insertion / removal direction of the medical instrument, and a plurality of abutment portions that are divided into a plurality of parts by slits extending radially from the edge of the hole, and abuts against the outer peripheral surface of the medical instrument in an airtight manner by the plurality of abutment portions when the medical instrument is inserted or removed; a plate-like second valve body that is disposed adjacent to the first valve body and located deeper than the first valve body, has flexibility, and normally abuts against the rear surface of the first valve body to close the slit, and is pushed by the medical instrument to retract and open the slit when the medical instrument is inserted; Equipped with The thickness of the contact portion of the first valve body is configured to be smaller than that of a portion other than the contact portion, A trocar valve mechanism characterized in that the surface of the first valve body facing the second valve body is recessed by being formed thin so that the abutment portion is spaced apart from the second valve body.

2. 2. The trocar valve mechanism of claim 1, The gap of the first valve body is made up of a plurality of gaps, A valve mechanism for a trocar, characterized in that the multiple slits are formed so that the angles between them are the same when viewed from the insertion / removal direction of the medical instrument.

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