WO2009052744A1

WO2009052744A1 - Improved one way valve for using with trocar

Info

Publication number: WO2009052744A1
Application number: PCT/CN2008/072692
Authority: WO
Inventors: Taili Zhou; Yanfang Li; Xing Zhou
Original assignee: Taili Zhou; Yanfang Li; Xing Zhou
Priority date: 2007-10-18
Filing date: 2008-10-15
Publication date: 2009-04-30

Abstract

An one way valve for using with a trocar in micro-invasive surgeries, such as celioscope, ventroscope, etc. The one way valve (1) is mounted in the cavity of the end portion of the trocar sheath tube (2), the one way valve (1) includes a V-shape funnel construction (11), the bottom is provided with a slit (12) for passing through a puncturing rod, and a support body (13) for forming a sealing pressure to the slit (12), the support body (13) has a ∧-shape construction, the support body (13) is connected to the bottom of the V-shape funnel construction (11), or connected to the outside of the opening of the V-shape funnel construction (11), some support ribs (17) are provided symmetrically, the support ribs (17) are distributed on two sides of the slit (12).

Description

Improved check valve for the trocar

Technical field

The invention relates to a medical device, in particular to a minimally invasive surgical operation such as laparoscopy or thoracoscopy.

Background technique

[2] In modern medicine, laparoscopic, thoracoscopic and other minimally invasive surgery have been used more and more widely. In order to avoid iatrogenic infection, disposable puncturing devices used in minimally invasive surgery such as laparoscopy and thoracoscopic surgery The amount of use is also increasing. On the basis of ensuring the performance, simplifying the structure and reducing the cost become the direction of improvement of the piercer.

[3] There are two main types of check valves for the puncturing device in the prior art, one of which is a spring-pressing type structure, and the spring plate is pressed by the spring plate to press the silicone sealing 圏 to form a seal, which is formed by a spring piece, a baffle plate, The silicone seal is used to form a one-way valve. The spring piece and the baffle are usually made of stainless steel. This type of check valve is often used in metal-made punctures for multiple use. This type of puncture is more expensive and has a higher weight. weight. In the past two years, in order to meet the needs of the development of disposable puncture devices, a funnel-type silicone check valve has been developed. This funnel-type silicone check valve has a straight through-cut at the bottom of the funnel type, utilizing the shrinkage force of the silicone itself. The pressure formed by the carbon dioxide pitting in the process to achieve the sealing effect, this funnel type silicone check valve is usually used in the disposable puncture device, due to the limited contraction force of the silica gel itself and the sealing pressure generated by the carbon dioxide pneumoperitone during use. Not large, resulting in a poor sealing effect of this one-way valve, easy to leak. A funnel-type seal is also used on other surgical instruments, such as the seal disclosed in U.S. Patent No. 5,916,198, which relies on gas pressure in the wall of the funnel to generate a small sealing pressure by means of gas pressure, resulting in a poor sealing effect, Suitable for puncture devices. Therefore, the inventor submitted an invention patent application entitled "One-way valve for a puncturing device" (application date is July 31, 2006, application number is 200610036835.8, publication date is February 7, 2007, publication number For CN1907513), the new design is proposed for the existing one-way valve for the puncturing device. Although the foregoing invention improves the sealing performance of the check valve in use, it has not been solved in the prior art that since the puncture rod is pulled out from the slit of the check valve, the slit is easily rolled up in the pulling direction (commonly known as " The problem of "flip"", the "flip" problem will cause the resistance of the device to pull out, Even the incision is deformed, resulting in a shortened service life of the one-way valve. Therefore, it is necessary to continue to improve the technical solution of the former invention.

Disclosure of invention

technical problem

[4] The object of the present invention is to provide an improved one-way valve for a trocar, which has a compact structure, is easy to manufacture, has high reliability, and has good sealing effect, and solves the problem that the puncturing rod is from one direction. The problem that the slit of the valve is pulled outward is easy to roll up the slit (commonly called "flip").

Technical solution

[5] The improved one-way valve for a trocar according to the present invention is mounted in a cavity in the tail of the trocar sheath. According to an embodiment of the present invention, the check valve includes a V-shaped funnel structure, the bottom surface is provided with a slit through which the piercing rod passes, and a support body forming a sealing pressure to the slit, the support body having a Λ type The support body is connected to the bottom surface of the V-shaped funnel structure, and the bottom surface of the support body is provided with symmetrical support ribs, and the support ribs are distributed on both sides of the slit, and a gas flow can be opened between the support ribs. Through hole.

[6] When the check valve of the above structure is compressed in the longitudinal direction, the check valve can form a sealing pressure on the slit to achieve a sealing effect. The one-way valve is installed in the cavity of the lancet tail sheath. When the puncturing rod 吋 of the puncturing device is inserted, the one-way valve is compressed in the longitudinal direction, and the supporting rib provided on the supporting body can generate and strengthen the cutting portion Sealing pressure. When the puncture bar of the puncture device is pulled out, the check valve can avoid the problem of "flipping" in the incision portion, that is, rolling up in the pulling direction due to the pulling action of the supporting rib.

[7] The support includes, but is not limited to, the following structure:

[8] First, the support body is a tubular structure with a circular or elliptical cross section, and the Λ-shaped structure of the support body is formed by the inner matching support surfaces thereof, whereby the V-shaped funnel structure and The support body constitutes a closed check valve of the X-shaped cross section.

[9] Second, the Λ-shaped structure of the support body is formed by the supporting arms that cooperate with each other, whereby the V-shaped funnel structure and the support body form an open X-way check valve.

[10] The height of the one-way valve is greater than or equal to the height of the cavity of the tail of the lancet sheath, so that the one-way valve is tightly mounted in the cavity of the one-way valve, so that the one-way after installation The valve is compressed in the longitudinal direction to create a resilient force such that the slit of the one-way valve creates a sealing pressure, i.e., the one-way valve is mounted to the tail of the sheath of the puncturing device after longitudinal compression. [11] The incision is a linear incision to facilitate the passage of the piercer.

[12] The support ribs are "S"-shaped ribs, so that the sealing pressure generated by the support ribs is maximized.

[13] An auxiliary rib is also arranged between the support ribs, so that the sealing pressure at the slit can be further enhanced.

[14] The V-shaped wall of the V-shaped funnel structure is provided with reinforcing ribs, thereby further enhancing the sealing pressure at the slit.

[15] The one-way valve is made of a flexible medical material. The flexible medical material is selected from the group consisting of medical silica gel, medical polyurethane, and medical rubber.

[16] When the puncture rod is inserted into the sheath of the puncture device, the incision is split and the puncture rod is passed through, and the upper lid is sealed with a sealing ring to form a seal to prevent air leakage. When the puncture rod is pulled out, the upper lid seal does not seal, but is sealed by a one-way valve. Since the one-way valve is installed at the tail of the sheath, there is a certain compression in the longitudinal direction, and the restoring force generated by the flexibility of the flexible medical material forms a sealing pressure on the slit of the one-way valve to achieve a sealing effect. The gas pressure of the carbon dioxide gas belly can also form a certain sealing pressure on the slit on the V-funnel structure wall of the check valve. In the prior art funnel type one-way valve, the gas pressure of the carbon dioxide puff is only used to form a sealing pressure on the slit. Since the gas pressure of the carbon dioxide pitting is low, it is usually difficult to form an effective seal.

[17] An improved one-way valve for a trocar according to the present invention is mounted in a cavity in the tail of the trocar sheath. According to another embodiment of the present invention, the check valve includes a V-shaped funnel structure, the bottom surface is provided with a slit through which the piercing rod passes, and a support body forming a sealing pressure to the slit, the support body connecting body The outer side of the funnel opening of the V-shaped funnel structure is provided with a symmetrical support rib between the inner side of the support body and the inclined surface of the V-shaped funnel structure, the support ribs are distributed on both sides of the slit; An auxiliary rib of a certain thickness and perpendicular to the direction of the slit.

[18] When the one-way valve of the above structure is installed in the cavity of the lancet tail sheath, since the diameter at the auxiliary rib of the support body is larger than the diameter of the cavity of the lancet tail sheath, when the check valve is compressed Installed in the cavity of the puncture sheath tail sheath, the auxiliary ribs of the pair of cooperating support bodies will generate radial pressure, which is transmitted to the inclined surface of the V-shaped funnel structure through the support ribs of the support body, forming a pair The sealing pressure of the slit reaches the sealing effect. Thereby, the support ribs and the auxiliary ribs can significantly increase the sealing pressure to the slit. The one-way valve is installed in the cavity of the lancet tail sheath. When the puncturing rod 吋 of the puncturing device is inserted, the one-way valve is compressed in the longitudinal direction, and the supporting rib provided on the supporting body can generate and strengthen the cutting portion Sealing pressure. when The puncture rod 吋 of the puncture device is pulled out, and the one-way valve can avoid the problem of "flipping" in the incision portion, that is, rolling up in the pulling direction.

[19] The support includes, but is not limited to, the following structure:

[20] First, the support body is composed of two supporting surfaces that cooperate with each other.

[21] When the one-way valve of the above structure is compressed in the longitudinal direction, the one-way valve can form a reinforced sealing pressure to the slit

, to achieve a better sealing effect.

[22] Second, the support body is a tubular structure having a circular or elliptical cross section. Further, the tubular structure is provided with a through hole for allowing gas to flow.

[23] When the one-way valve of the above structure is compressed in the longitudinal direction, the returning force after deformation by the circular or elliptical tubular structure can form a sealing pressure on the slit to achieve a better sealing effect.

[24] The height of the one-way valve is greater than or equal to the height of the cavity of the tail of the puncture sheath. Therefore, the one-way valve is tightly installed in the cavity of the one-way valve, so that the one-way after installation can be made. The valve is compressed in the longitudinal direction to create a resilient force such that the slit of the one-way valve creates a sealing pressure, i.e., the one-way valve is mounted to the tail of the sheath of the puncturing device after longitudinal compression.

[25] The incision is a linear incision to facilitate the passage of the piercer.

[26] The support ribs are "S" shaped ribs, so that the sealing pressure generated by the support ribs is maximized.

[27] The V-shaped wall of the V-shaped funnel structure is provided with a reinforcing rib to further enhance the sealing pressure at the slit.

[28] The one-way valve is made of a flexible medical material. The flexible medical material is selected from the group consisting of medical silica gel, medical polyurethane, and medical rubber.

[29] When the puncture rod is inserted into the sheath of the puncture device, the incision is split and the puncture rod is passed. The sealing cap of the upper lid encloses the puncture rod to form a seal to prevent air leakage. When the puncture rod is removed, the upper lid seal does not seal, but is sealed by a one-way valve. Since the one-way valve is installed at the tail of the sheath, there is a certain compression in the longitudinal direction, and the restoring force generated by the good elasticity of the flexible medical material forms a sealing pressure on the slit of the one-way valve to achieve a sealing effect. The gas pressure of the carbon dioxide gas belly can also form a certain sealing pressure on the slit of the V-shaped funnel structure wall of the check valve. In the prior art funnel type one-way valve, the gas pressure of the carbon dioxide puff is only used to form a sealing pressure on the slit. Since the gas pressure of the carbon dioxide pitting is low, it is usually difficult to form an effective seal. Beneficial effect

[30] The improved check valve for a trocar according to the present invention has a compact structure, is easy to manufacture, and has high reliability, and the sealing effect is good, and the puncturing rod is solved from the slit of the check valve. It is easy to pull out the shackles in the direction of pulling out (commonly called "flipping"). The puncture device manufactured by the one-way valve of the invention can not only maintain good sealing ability after the puncture rod is inserted, but also can prevent the phenomenon of "flipping" when the puncture rod is pulled out, and the service life is up to several 100,000 times. Therefore, the one-way valve can be widely used in trocars such as laparoscopic and thoracoscopic minimally invasive surgery.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a first embodiment of a modified one-way valve for a trocar according to the present invention, with the bottom of the check valve facing upward.

Figure 2 is a cross-sectional view taken along line A-A of the check valve shown in Figure 1;

Figure 3 is a bottom plan view of the check valve shown in Figure 1.

Figure 4 is a plan view of the check valve shown in Figure 1.

Figure 5 is a perspective view of a second embodiment of a modified one-way valve for a trocar according to the present invention, with the bottom of the check valve facing upward.

Fig. 6 is a cross-sectional view taken along line B-B of the check valve shown in Fig. 5.

Figure 7 is a bottom plan view of the check valve shown in Figure 5.

Figure 8 is a plan view of the check valve shown in Figure 5.

[39] Fig. 9 is a schematic view showing the structure of a trocar having the one-way valve shown in Fig. 1 or Fig. 5.

Fig. 10 is a schematic view showing the structure in which the puncture rod is inserted into the trocar shown in Fig. 9.

Figure 11 is a schematic view of the sealing of a trocar with a one-way valve according to the present invention. In the figure, a broken line with an arrow indicates the flow direction of carbon dioxide gas, and a wide solid arrow indicates a longitudinal pressure of the one-way valve. direction.

Figure 12 is a perspective structural illustration of a third embodiment of the improved one-way valve for a trocar according to the present invention.

Figure 13 is another perspective view of the one-way valve of Figure 12 with the bottom of the check valve facing upward.

Figure 14 is a cross-sectional view taken along line A-A of the check valve shown in Figure 12 .

Figure 15 is a bottom plan view of the check valve shown in Figure 12 .

Figure 16 is a perspective view showing the fourth embodiment of the improved one-way valve for a trocar according to the present invention. Intention.

Figure 17 is a perspective view of the check valve shown in Figure 16 with the bottom of the check valve facing upward.

Figure 18 is a cross-sectional view taken along line B-B of the check valve shown in Figure 16 .

19 is a bottom view of the check valve shown in FIG. 16.

Fig. 20 is a schematic view showing the structure of a puncturing device in which the check valve shown in Fig. 12 or Fig. 16 is attached.

Figure 21 is a cross-sectional view taken along line C C of the check valve shown in Figure 20 . The dotted line indicates the direction in which the carbon dioxide gas flows.

22 is a schematic view showing the structure of FIG. 21 after the insertion of the puncture rod.

[53] In the above picture:

[54] 1 is a check valve according to the present invention, 2 is a puncture sheath tube, 3 is an upper cover, 4 is a puncture rod, 5 is an upper cover seal 圏, 6 is a limit block, 7 is a vent valve, 8 11 is a V-shaped funnel structure, 12 is a slit, 13 is a support body, 14 is a reinforcing rib, 16 is a through hole, 17 is a support rib, and 18 is an auxiliary rib.

BEST MODE FOR CARRYING OUT THE INVENTION

[55] Example 1: Improved check valve

[0] As shown in FIG. 1 to FIG. 4, the improved one-way valve for a trocar of the present invention has a V-shaped funnel structure 11 at the upper portion and a slit 12 through which the puncturing device passes through the bottom surface (preferably A straight slit), the lower portion of the check valve is a support body 13 having a Λ-shaped structure, and the support body 13 is connected to the bottom surface of the V-shaped funnel structure 11. The support body 13 is a tubular structure having a circular or elliptical cross section, and the Λ-shaped structure of the support body 13 is formed by the inner mating support faces thereof, whereby the V-shaped funnel structure 11 and the support body 13 constitute a closed structure. A one-way valve with a section X. Symmetrical support ribs 17 are provided on the bottom surface of the support body 13 (preferably "S"-shaped ribs. The support ribs 17 are distributed on both sides of the slit 12, and a passage for allowing gas to flow is provided between the support ribs 17 Holes 16. As shown in FIG. 1 to FIG. 3, auxiliary ribs 18 are further disposed between the support ribs 17. As shown in FIG.

A rib 14 is provided on the V-shaped wall of the V-shaped funnel structure 11.

[57] After the mold is designed according to the above product design, it is produced according to the standard manufacturing process of the medical silica gel product, and the X-type check valve described in this embodiment can be obtained. The one-way valve can be made of a flexible medical material, such as medical silicone, medical polyurethane or medical rubber.

[58] Example 2: Improved check valve

[59] As shown in FIG. 5 to FIG. 8, the improved one-way valve for a trocar according to the present invention has a V-shaped funnel structure 11 at the upper portion and a slit 12 through which the puncturing device passes through the bottom surface (preferably Straight cut), the check valve The lower portion is a support body 13 having a Λ-shaped structure, and the support body 13 is connected to the bottom surface of the V-shaped funnel structure 11. The Λ-shaped structure of the support body 13 is formed by mutually cooperating support arms, whereby the V-shaped funnel structure 11 and the support body 13 constitute an open-type one-way valve of an X-shaped cross section. Symmetrical support ribs 17 (preferably "S" shaped ribs) are disposed on the bottom surface of the support body 13, and the support ribs 17 are distributed on both sides of the slit 12, and gas is circulated between the support ribs 17 Through hole 16. As shown in FIGS. 5 to 7, an auxiliary rib 18 is further disposed between the support ribs 17. As shown in Fig. 8, a reinforcing rib 14 is provided on the V-shaped wall of the V-shaped funnel structure 11.

[60] After the mold is designed according to the above product design, it is produced according to the standard manufacturing process of the medical silica gel product, and the X-type check valve described in this embodiment can be obtained. The one-way valve can be made of a flexible medical material, such as medical silicone, medical polyurethane or medical rubber.

[61] A puncturing device equipped with a one-way valve according to the first embodiment or the second embodiment of the present invention

According to the technical solution of the present invention, the check valve 1 of the present invention is designed and manufactured by using a medical grade silica gel or a flexible medical material such as medical polyurethane or medical rubber. Referring to the prior art design of the puncturing device, the medical plastic is separately manufactured to manufacture the sheath tube 2, the upper cover 3, the puncturing rod 4, the upper cover sealing 圏 5, the limiting block 6 and the venting valve 7 of the puncturing device, assembled according to the design drawing. . Firstly, the check valve 1 of the present invention is installed at the tail of the sheath tube 2, the height of the one-way valve 1 is slightly larger than the installation size for mounting the one-way valve 1 on the tail portion of the sheath tube 2, and the card fits the mounting limit block 6; The limiting block 6 can also be ultrasonically welded on the tail of the sheath 2, so that the check valve 1 of the present invention has a certain compression in the axial direction (or longitudinal direction) after the sheath 2 is installed, because the medical silicone is good. The restoring force generated by the elasticity forms a sealing pressure on the slit 12 of the check valve 1 to form a support. Finally, the upper cover sealing jaw 5, the upper cover 3 and the venting valve 7 are installed. The upper cover 3 can be screwed to the tail of the sheath 2, or can be ultrasonically welded to the tail of the sheath 2, or bonded to the sheath 2 with an adhesive. The venting valve 7 is ultrasonically welded to a reserved position at the tail of the sheath 2, or adhered to the reserved position of the tail of the sheath 2 with an adhesive. The venting valve 7 is a commonly used two-way or three-way medical valve. See Figure 9 and Figure 11.

[63] In order to improve the anti-slip performance of the sheath 2 of the puncture device, a corrugated anti-slip pattern 8 or a rough-treated anti-slip pattern can be produced at the front portion of the sheath 2 of the puncture device. See Figs. 9 and 10.

[64] When the puncture rod 4 is inserted into the sheath 2 of the puncture device, the incision 12 is split, the puncture rod 4 is passed, and the puncture rod 4 is sealed with the upper cover to form a seal to prevent air leakage, see Fig. 10.

[65] When the puncture rod 4 is removed, the upper lid seal 5 does not seal, but is sealed by the check valve 1. Since the one-way valve 1 is installed in the tail of the sheath tube 2, there is a certain compression in the longitudinal direction, and the medical silicone is well elasticized. The restoring force forms a sealing pressure on the slit 12 of the one-way valve 1 to achieve a sealing effect; the gas pressure of the carbon dioxide gas belly can also form a certain sealing pressure on the slit 12 on the wall of the V-shaped funnel structure 11 of the one-way valve 1 Figure 9 and Figure 11. However, the prior art funnel type one-way valve only forms a sealing pressure on the slit by the gas pressure of the carbon dioxide puff, and the gas pressure of the carbon dioxide puff is usually not effective.

[66] Example 3: Improved check valve

[67] As shown in FIGS. 12 to 15, the improved one-way valve for a trocar of the present invention includes a V-shaped funnel structure 11 having a slit 12 through which a puncturing device passes (preferably a straight line) And a support body 13 that forms a sealing pressure on the slit 12, the support body 13 connecting the outside of the funnel opening of the V-shaped funnel structure 11. The support body 13 is composed of two mutually cooperating support faces. Between the inner side of the support body 13 and the inclined surface of the V-shaped hopper structure 11, symmetric support ribs 17 (preferably "S" shaped ribs) are provided, which are distributed on both sides of the slit 12. An auxiliary rib 18 of a certain thickness and perpendicular to the direction of the slit 12 is protruded from the outer wall of the support body 13. As shown in Fig. 12, a reinforcing rib 14 is provided on the V-shaped wall of the V-shaped funnel structure 11.

[68] After the mold is designed according to the above product design, it is produced according to the standard manufacturing process of the medical silica gel product, and the X-type check valve described in this embodiment can be obtained. The one-way valve can be made of a flexible medical material, such as medical silicone, medical polyurethane or medical rubber.

[69] Example 4: Improved check valve

[70] As shown in FIGS. 16 to 19, the improved one-way valve for a trocar of the present invention includes a V-shaped funnel structure 11 having a slit 12 through which a puncturing device passes (preferably a straight line) And a support body 13 that forms a sealing pressure on the slit 12, the support body 13 connecting the outside of the funnel opening of the V-shaped funnel structure 11. The support body 13 is a tubular structure having a circular or elliptical cross section. The tubular structure is provided with a through hole 16 through which gas can flow. Between the inside of the support body 13 and the slope of the V-shaped funnel structure 11, symmetric support ribs 17 (preferably "S" shaped ribs) are provided, which are distributed on both sides of the slit 12. An auxiliary rib 18 of a certain thickness and perpendicular to the direction of the slit 12 is protruded from the outer wall of the support body 13. As shown in Fig. 16, a rib 14 is provided on the V-shaped wall of the V-shaped funnel structure 11.

[71] After the mold is designed according to the above product design, it is produced according to the standard manufacturing process of the medical silica gel product, and the X-type check valve described in this embodiment can be obtained. The one-way valve can be made of a flexible medical material, such as medical silicone, medical polyurethane or medical rubber. [72] A puncturing device equipped with a one-way valve according to the third embodiment or the fourth embodiment of the present invention

According to the technical solution of the present invention, the check valve 1 of the present invention is designed and manufactured by using a medical grade silicone or a medical material such as medical polyurethane or medical rubber. Referring to the prior art design of the puncturing device, the medical plastic is separately manufactured to manufacture the sheath tube 2, the upper cover 3, the puncturing rod 4, the upper cover sealing 圏 5, the limiting block 6 and the venting valve 7 of the puncturing device, assembled according to the design drawing. . Firstly, the check valve 1 of the present invention is installed at the tail of the sheath tube 2, the height of the one-way valve 1 is slightly larger than the installation size for mounting the one-way valve 1 on the tail portion of the sheath tube 2, and the card fits the mounting limit block 6; The limiting block 6 can also be ultrasonically welded on the tail of the sheath 2, so that the check valve 1 of the present invention has a certain compression in the axial direction (or longitudinal direction) after the sheath 2 is installed, because the medical silicone is good. The restoring force generated by the elasticity forms a sealing pressure on the slit 12 of the check valve 1 to form a support. Finally, the upper cover sealing jaw 5, the upper cover 3 and the venting valve 7 are installed. The upper cover 3 can be screwed to the tail of the sheath 2, or can be ultrasonically welded to the tail of the sheath 2, or bonded to the sheath 2 with an adhesive. The venting valve 7 is ultrasonically welded to a reserved position at the tail of the sheath 2, or adhered to the reserved position of the tail of the sheath 2 with an adhesive. The venting valve 7 is a commonly used two-way or three-way medical valve. See Figure 20 and Figure 22.

[74] In order to improve the anti-slip performance of the sheath 2 of the trocar, a corrugated anti-slip pattern 8 or a rough-treated anti-slip pattern can be produced at the front portion of the sheath 2 of the trocar. See Figs. 20 and 21 .

[75] When the puncture rod 4 is inserted into the sheath 2 of the puncture device, the incision 12 is split, the puncture rod 4 is passed, and the puncture rod 4 is sealed with the upper cover to form a seal to prevent air leakage, see Fig. 21.

[76] When the puncture rod 4 is removed, the upper cover seal 圏 5 does not seal, but is sealed by the check valve 1 . Since the check valve 1 is installed in the tail portion of the sheath tube 2 and has a certain compression in the longitudinal direction, the restoring force generated by the good elasticity of the medical silica gel forms a sealing pressure on the slit 12 of the one-way valve 1 to achieve a sealing effect; The gas pressure can also form a certain sealing pressure on the slit 12 on the wall of the V-shaped funnel structure 11 of the one-way valve 1, see Fig. 9. In the prior art funnel type one-way valve, the gas pressure of the carbon dioxide puff is only used to form a sealing pressure on the slit, and since the gas pressure of the carbon dioxide puff is low, an effective seal cannot usually be formed.

Claims

Claim

[1] 1. An improved one-way valve for a trocar, installed in a cavity at the tail of the lancet sheath (2), the one-way valve comprising a V-shaped funnel structure (11), the bottom surface being open for Incision through the piercing rod

(12), and a support body (13) forming a sealing pressure to the slit (12), the support body (13) having a _Λ -shaped structure, the support body (13) connecting the V-shaped funnel structure (11) a bottom surface, a symmetrical support rib (17) is arranged on the bottom surface of the support body (13), and the support ribs (17) are distributed on both sides of the slit (12), and are opened between the support ribs (17). A through hole (16) through which the gas circulates.

[2] 2. The check valve according to claim 1, wherein: the support body (13) is a tubular structure having a circular or elliptical cross section, and the support structure (13) has a meandering structure. The V-shaped funnel structure (11) and the support body (13) form a closed one-way valve of an X-shaped cross section.

[3] 3. The one-way valve according to claim 1, wherein: the Λ-shaped structure of the support body (13) is formed by mutually cooperating support arms, whereby the V-shaped funnel structure (11) The support body (1 3) forms an open X-way check valve.

[4] 4. The check valve according to claim 1, wherein the support rib (17) is an "S" shaped rib.

[5] The check valve according to claim 1, characterized in that: the support ribs (17) are further provided with auxiliary ribs (18).

[6] 6. The check valve according to claim 1, wherein the V-shaped wall of the V-shaped funnel structure (11) is provided with a reinforcing rib (14).

[7] 7. An improved one-way valve for a trocar, installed in a cavity at the tail of the lancet sheath (2), the one-way valve comprising a V-shaped funnel structure (11), the bottom surface being open for Incision through the piercing rod

(12), and a support body (13) for forming a sealing pressure to the slit (12), the support body (13) connecting the outside of the funnel opening of the V-shaped funnel structure (11), in the support body (13) Between the inner side and the inclined surface of the V-shaped funnel structure (11), symmetric support ribs (17) are arranged, the support ribs (17) are distributed on both sides of the slit (12); protruding on the outer wall of the support body (13) An auxiliary rib (18) of a certain thickness and perpendicular to the slit (12) is provided.

[8] 8. The check valve according to claim 7, wherein the support body (13) is composed of two mutually matching support faces.

[9] The check valve according to claim 7, wherein the support body (13) is a tubular structure having a circular or elliptical cross section.

[10] 10. The check valve according to claim 9, wherein: the tubular structure is provided with a through hole (16) for allowing gas to flow.

[11] 11. The check valve according to claim 7, wherein: said support rib (17) is "S

"The shape of the tendon.

[12] 12. The check valve according to claim 7, wherein the V-shaped wall of the V-shaped funnel structure (11) is provided with a reinforcing rib (14).