Puncture outfit for laparoscope

Abstract

A puncture outfit for a laparoscope is provided with an air blocking sealing cover, a pressing plate, a hoop assembly, an air blocking valve, a sleeve assembly and a puncture needle assembly, the air blocking sealing cover comprises a base upper cover, a base lower cover and a sealing assembly arranged between the base upper cover and the base lower cover in a sealing mode, the sealing assembly is in lap joint with the base lower cover, and the base upper cover and the base lower cover are axially aligned and fixedly connected; a supporting column is arranged on a sealing upper cover of the sealing assembly in a protruding mode and penetrates through a supporting piece, an integrated telescopic sealing piece and a through hole formed in a sealing lower cover correspondingly, and the supporting piece is tightly attached to the inner top face of the integrated telescopic sealing piece. An upper round hole with the diameter smaller than that of an inserted instrument is formed in the center of the integrated telescopic sealing piece. The connecting mode of the air-blocking sealing cover and the sleeve assembly is adjusted from a pressing type spring structure to a pinching type spring structure, the sleeve assembly is not subjected to external force, meanwhile, a split type sealing structure is changed into an integrated sealing structure, air leakage risk points are reduced, and the sealing performance is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of trocars, and particularly relates to a trocar for laparoscopy. Background Art

[0002] An abdominal trocar is a commonly used surgical instrument in abdominal puncture surgery. It can pierce the abdominal wall and provide a passage for other surgical instruments to enter the body cavity, belonging to a minimally invasive surgical instrument. The trocar generally includes a cannula assembly serving as a passage for other surgical instruments to enter, a gas-blocking seal cover provided on the cannula assembly, and a puncture rod penetrating through the cannula assembly and the gas-blocking seal cover.

[0003] To penetrate the skin, first use a scalpel to cut the skin epidermis, then the puncture rod penetrates the skin and enters the body cavity. By applying pressure to the proximal end of the puncture rod, the tip of the puncture rod is pushed through the skin until the trocar enters the body cavity. After the puncture rod is withdrawn, the cannula assembly can serve as a minimally invasive instrument passage for performing endoscopic surgical operations and endoscopic examinations.

[0004] During the use of the existing trocar, the gas-blocking seal cover is fixedly connected to the cannula assembly by a buckle structure with bilateral pressing or unilateral pressing. During use, since it is necessary to press the spring from the side, it is easy to make the cannula assembly shake, and the operation is inconvenient. Moreover, its fastening is only fixed by two snap connections. When a surgical instrument passes through the gas-blocking seal cover and the cannula assembly, if the inclination angle of the surgical instrument is too large, it is easy to cause the relative swing between the gas-blocking seal cover and the cannula assembly, resulting in insufficient connection between the gas-blocking seal cover and the cannula assembly and causing air leakage; in addition, the sealing structure in the existing gas-blocking seal cover has a large number of parts and is a split structure of two sealing parts, involving many sealing positions, increasing the probability of air leakage, and the process is complicated, inconvenient to manufacture, and the production efficiency is low.

[0005] The utility model with the publication number CN203749523U discloses a connection mechanism between a puncture cannula seat and a conversion cap of a new trocar. The key points of its technical solution include a conversion cap and a puncture cannula seat. An arc-shaped notch is provided on the circumferential side of the puncture cannula seat. At least two locking inserts are inserted into the arc-shaped notch. One end of each locking insert is connected to a pressing part provided outside the arc-shaped notch. A limiting mechanism is provided between the locking insert and the puncture cannula seat. Each locking insert is connected to the conversion seat body through a detachable locking structure. An anti-swing connection structure capable of preventing the relative swing between the conversion seat body and the puncture cannula seat is further provided between the conversion seat body and the puncture cannula seat. It mainly focuses on convenient disassembly and assembly, realizing bilateral simultaneous fixation or detachment, tight connection, and the conversion cap and the sleeve seat are not easy to be misaligned and not easy to swing relatively, but the split-type sealing structure still needs to be improved.

[0006] The utility model with the publication number CN203710098U discloses a sealing assembly of a puncture sleeve of a trocar. The key points of its technical solution include a ring-shaped first mounting seat and a second mounting seat. Between the first mounting seat and the second mounting seat, there are several sealing gaskets arranged in a circumferential and staggered superposition manner through a mounting structure. The sealing gasket includes a conical sealing body. A sector-shaped notch is provided on the sealing body. An arc-shaped mounting skirt is provided circumferentially at the bottom end of the sealing body and is located between the first mounting seat and the second mounting seat. At least one arc-shaped protrusion is provided on the circumferential edge of the mounting skirt, and the arc-shaped protrusions are evenly distributed circumferentially between the first mounting seat and the second mounting seat. Although its structure is simple and reasonable, the installation is firm, it is convenient for installation, the stability is strong, and it is not easy to tear and not easy to break away from the mounting seat during use, but the overall sealing performance still cannot meet the requirements. Summary of the Invention

[0007] The purpose of the present invention is to provide a trocar for laparoscopy to improve the sealing performance of the gas-blocking sealing cover in view of the above-mentioned deficiencies of the prior art.

[0008] To solve the above technical problems, the technical solution adopted by the present invention is: A trocar for laparoscopy includes a gas-blocking sealing cover, a pressing plate, a clamp assembly, a gas-blocking valve, a sleeve assembly, and a puncture needle assembly. The gas-blocking sealing cover includes an upper base, a lower base, and a sealing assembly hermetically arranged between the two. The sealing assembly is lapped on the lower base, and the upper base and the lower base are axially aligned and fixedly connected. The sealing assembly includes an upper sealing cover, a support sheet, an integral telescopic seal, and a lower sealing cover. The upper sealing cover protrudes with a support column that passes through the through holes respectively opened on the support sheet, the integral telescopic seal, and the lower sealing cover, and the support sheet is closely attached to the inner top surface of the integral telescopic seal. Moreover, an upper round hole with a diameter smaller than the diameter of the inserted instrument is also opened in the center of the integral telescopic seal. The sleeve assembly includes a sleeve, a valve seat, and a switching device that is in interference fit with the valve seat. A limit platform is provided on the switching device and it rotates only in the limit notch provided on the valve seat. The gas-blocking valve is sleeved on the annular rib arranged in the sleeve through a provided card slot to form an interference fit. The pressing plate is fixedly arranged on the sleeve and axially compresses the gas-blocking valve, and the clamp assembly is clamped on the sleeve. During assembly, the puncture needle assembly axially penetrates into the large sleeve assembly formed by the cooperation of the gas-blocking sealing cover, the pressing plate, the clamp assembly, the gas-blocking valve, and the sleeve assembly, and is rotationally clamped and positioned in the upper base.

[0009] A plurality of the support sheets are provided and enclose a ring-shaped member. The support sheet includes a connecting outer edge and an inclined portion provided at its bottom. An arc-shaped hole is opened in the center of the inclined portion and forms an upper round hole after enclosure. A support hole for passing through the support column is also opened on the connecting outer edge.

[0010] Both the upper base cover and the lower base cover are provided with annular ribs. The annular rib on the upper base cover presses tightly against the annular surface of the integral telescopic seal to form an interference fit, while the annular rib on the lower base cover presses tightly against the bottom surface of the clamping groove of the integral telescopic seal to form an interference fit; On the lower end surface of the lower base cover, a plurality of buckles for limiting the clamp assembly are arranged and extend downward.

[0011] The clamp assembly includes a left clamp, a right clamp rotatably arranged, and a torsion spring arranged between the two. The left clamp and the right clamp are arranged in a limited manner on the sleeve of the sleeve assembly; The torsion spring is axially sleeved on the main cylinder arranged on the right clamp and drives the clamp assembly to rotate around the cylinder axis on the right clamp under the action of an external force.

[0012] At the lower end of the pressing plate, an avoidance notch for passing through the clamp assembly and a positioning post for inserting and positioning with the sleeve are opened, and a buckle through-hole for passing through the buckle is also opened on the upper end surface of the pressing plate.

[0013] After the pressing plate, the clamp assembly, the air-blocking valve, and the sleeve assembly are assembled, they form a large sleeve assembly M. The large sleeve assembly M is assembled with the air-blocking and sealing cover, and the buckle on the lower base cover of the air-blocking and sealing cover is correspondingly inserted into the buckle through-hole of the pressing plate in the large sleeve assembly M; The arc top surfaces of the buckles respectively press down on the inclined surface structures of the left clamp and the right clamp. Under the downward pressure of the buckles, the left clamp rotates counterclockwise around the cylinder axis on the right clamp, and the right clamp rotates clockwise around the cylinder axis and is in an open state; When the large sleeve assembly M is further pressed down, the buckle contact surfaces of the buckles respectively snap onto the bottom surfaces of the left clamp or the right clamp correspondingly. After releasing the hand, the air-blocking and sealing cover no longer bears the downward pressure. Under the action of the torsion spring, the left clamp and the right clamp respectively rotate around the cylinder on the right clamp and are in a closed state. The air-blocking and sealing cover is buckled on the large sleeve assembly M.

[0014] The puncture needle assembly includes a puncture needle and a puncture needle cover. At the end of the puncture needle, a positioning post and a positioning boss are provided, and at the head end of the puncture needle, a puncture rod and a cutting edge are correspondingly provided; The puncture needle cover is provided with a hexagonal hole groove and is in interference fit with the end of the puncture needle.

[0015] The sleeve is also provided with a welding wire, and the pressing plate is correspondingly provided with a welding groove. The pressing plate is welded on the sleeve and axially compresses the air-blocking valve.

[0016] Both the air-blocking valve and the integral telescopic seal are made of soft rubber material.

[0017] The beneficial effects of the present invention are: (1) The present invention discloses a laparoscopic puncture device, which is provided with an air-blocking sealing cover, a pressure plate, a clamp assembly, an air-blocking valve, a sleeve assembly and a puncture needle assembly, and the air-blocking sealing cover includes a base upper cover, a base lower cover and a sealing assembly arranged between the two, the sealing assembly is overlapped on the base lower cover, and the base upper cover and the base lower cover are axially aligned and fixed; the sealing assembly includes a sealing upper cover, a support sheet, an integrated telescopic sealing member and a sealing lower cover, and the sealing upper cover is provided with a support column protruding and passing through the corresponding through holes on the support sheet, the integrated telescopic sealing member and the sealing lower cover, and the support sheet is tightly attached to the inner top surface of the integrated telescopic sealing member; and the core of the integrated telescopic sealing member is also provided with an upper circular hole with a diameter smaller than the diameter of the inserted instrument; the connection mode between the air-blocking sealing cover and the sleeve assembly is adjusted from a pressing spring structure to a pinching spring structure, the sleeve assembly is not subjected to external force, and the split sealing structure is changed to an integrated sealing structure, thereby reducing the risk point of air leakage and improving the sealing performance.

[0018] (2) The pressure plate, clamp assembly, air blocking valve and sleeve assembly are assembled to form the sleeve assembly M. The sleeve assembly M is assembled with the air blocking sealing cover, and the buckles on the base lower cover of the air blocking sealing cover are correspondingly inserted into the buckle through holes of the pressure plate in the sleeve assembly M to achieve a tight assembly connection between the air blocking sealing cover and the sleeve assembly M to avoid air leakage.

[0019] (3) The clamp assembly is provided with a left clamp and a right clamp that are rotatably arranged and a torsion spring arranged between the two. The left clamp and the right clamp are limitedly arranged on the sleeve of the sleeve assembly. The torsion spring is axially sleeved on the cylinder provided on the right clamp and drives the clamp assembly to rotate around the axis of the cylinder on the right clamp under the action of external force. The pinching spring structure avoids the leakage caused by the sleeve assembly swinging due to the external force.

[0020] (4) The support sheet is provided with multiple ring-shaped parts that are stacked on each other and tightly fit on the inner top surface of the integrated telescopic seal. When the instrument enters, the tip of the instrument can effectively avoid damage to the integrated telescopic seal. Moreover, when the instrument enters, it first contacts the ring-shaped support sheet, which can reduce the contact area between the integrated telescopic seal and the instrument, reduce the tightness of the integrated telescopic seal on the instrument, and greatly reduce the resistance of the instrument to enter and exit; and the support sheet cooperates with the reinforcing ribs arranged on the integrated telescopic seal to prevent the integrated telescopic seal from being turned over when the instrument is pulled out, thereby ensuring sealing.

[0021] (5) The one-piece telescopic seal is made of soft material. When the upper circular hole is stretched, it will tightly wrap the outer wall of the instrument to avoid air leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the present invention; Figure 2is the exploded view of the present invention; Figure 3 is the top view of the product after removing the upper cover assembly; Figure 4 is the structural schematic diagram of the clamp assembly; Figure 5 is the exploded view of the clamp assembly; Figure 6 is the structural schematic diagram of the left clamp; Figure 7 is the structural schematic diagram of the right clamp; Figure 8 is the explosion of the air-blocking seal cover Figure 1 ; Figure 9 is the explosion of the air-blocking seal cover Figure 2 ; Figure 10 is the explosion of the seal assembly Figure 1 ; Figure 11 is the explosion of the seal assembly Figure 2 ; Figure 12 is the three-dimensional view of the air-blocking valve Figure 1 ; Figure 13 is the three-dimensional view of the air-blocking valve Figure 2 ; Figure 14 is the exploded view of the sleeve assembly; Figure 15 is the structural schematic diagram of the sleeve; Figure 16 is the three-dimensional view of the pressing plate Figure 1 ; Figure 17 is the three-dimensional view of the pressing plate Figure 2 ; Figure 18 is the cross-sectional view after removing the puncture needle assembly; Figure 19 is Figure 18 the partial enlarged schematic diagram of; Figure 20 is the exploded view of the puncture needle assembly; Figure 21 is the three-dimensional view of the puncture needle Figure 1 ; Figure 22 is the three-dimensional view of the puncture needle Figure 2 ; Figure 23 is the structural schematic diagram of the puncture needle cover. Detailed implementation manners

[0023] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0024] The present invention provides a trocar for laparoscopy, as Figures 1 to 23 shown.

[0025] A trocar for laparoscopy includes an airtight sealing cover, a pressing plate, a clamp assembly, an air-blocking valve, a cannula assembly, and a puncture needle assembly. The airtight sealing cover includes a base upper cover, a base lower cover, and a sealing assembly hermetically disposed therebetween. The sealing assembly overlaps on the base lower cover, and the base upper cover is axially aligned and fixedly connected to the base lower cover. The sealing assembly includes a sealing upper cover, a support sheet, an integrally telescopic seal, and a sealing lower cover. The sealing upper cover protrudes with a support post that passes through through holes respectively formed in the support sheet, the integrally telescopic seal, and the sealing lower cover, and the support sheet closely adheres to the inner top surface of the integrally telescopic seal. A circular upper hole with a diameter smaller than the diameter of the inserted instrument is also formed in the center of the integrally telescopic seal.

[0026] The cannula assembly includes a cannula, a valve seat, and a switching device in interference fit with the valve seat. A limit platform is provided on the switching device and it rotates only in a limit notch provided on the valve seat.

[0027] The air-blocking valve is sleeved on an annular rib disposed in the cannula through a provided card slot to form an interference fit. The pressing plate is fixedly provided on the cannula and axially compresses the air-blocking valve, and the clamp assembly is clamped on the cannula.

[0028] During assembly, the puncture needle assembly axially penetrates into a large cannula assembly formed by the cooperation of the airtight sealing cover, the pressing plate, the clamp assembly, the air-blocking valve, and the cannula assembly, and is rotationally clamped and positioned in the base upper cover.

[0029] A plurality of the support sheets are provided and enclose a ring-shaped member. The support sheet includes a connecting outer edge and an inclined portion fixedly provided at its bottom. An arc-shaped hole is formed in the center of the inclined portion and forms a circular upper hole 1244 after enclosure. A support hole 1221 for passing through the support post is also formed in the connecting outer edge.

[0030] Annular ribs are provided on both the base upper cover and the base lower cover. The annular rib on the base upper cover tightly presses the annular surface of the integrally telescopic seal to form an interference fit, and the annular rib on the base lower cover tightly presses the bottom surface of the card slot of the integrally telescopic seal to form an interference fit. A plurality of buckles for limiting the clamp assembly are downwardly extended and provided on the lower end surface of the base lower cover.

[0031] The clamp assembly includes a left clamp, a right clamp rotatably arranged, and a torsion spring disposed therebetween. The left clamp and the right clamp are arranged in a limited manner on the sleeve of the sleeve assembly. The torsion spring is axially sleeved on the main cylinder 333 provided on the right clamp and drives the clamp assembly to rotate around the cylinder axis on the right clamp under the action of an external force.

[0032] The lower end of the pressing plate is provided with an avoidance notch for passing through the clamp assembly and a positioning post for plugging and positioning with the sleeve, and a snap-through hole for passing through the snap is also provided on the upper end surface of the pressing plate.

[0033] After the pressing plate, the clamp assembly, the air-blocking valve, and the sleeve assembly are assembled, they form a large sleeve assembly M. The large sleeve assembly M is assembled with the air-blocking seal cover, and the snap on the base lower cover of the air-blocking seal cover is correspondingly inserted into the snap-through hole of the pressing plate in the large sleeve assembly M. The arc top surfaces of the snaps respectively press down on the inclined surface structures of the left clamp and the right clamp. Under the downward pressure of the snaps, the left clamp rotates counterclockwise around the cylindrical axis on the right clamp, and the right clamp rotates clockwise around the cylindrical axis to be in an open state.

[0034] When the large sleeve assembly M is further pressed down, the snap contact surfaces of the snaps respectively snap onto the bottom surfaces of the left clamp or the right clamp. After releasing the hand, the air-blocking seal cover no longer bears the downward pressure. The left clamp and the right clamp rotate around the cylinder on the right clamp respectively under the action of the torsion spring and are in a closed state. The air-blocking seal cover is snapped onto the large sleeve assembly M.

[0035] The puncture needle assembly includes a puncture needle and a puncture needle cover. The end of the puncture needle is provided with a positioning post 611 and a positioning boss 612, and the head end of the puncture needle is correspondingly provided with a puncture rod and a cutting edge. The puncture needle cover is provided with a hexagonal hole groove and is in interference fit with the end of the puncture needle.

[0036] The sleeve is further provided with a welding wire, and the pressing plate is correspondingly provided with a welding groove. The pressing plate is welded on the sleeve and axially compresses the air-blocking valve.

[0037] The following is further illustrated in combination with specific embodiments: The air-blocking seal cover 1 includes a base upper cover 11, a sealing assembly 12, and a base lower cover 13. The sealing assembly 12 further includes a sealing upper cover 121, a support sheet 122, a sealing lower cover 123, and an integral telescopic sealing member 124; as Figure 5 shown, the clamp assembly 3 includes a left clamp 31, a torsion spring 32, and a right clamp 33; as Figure 14 shown, the sleeve assembly 5 includes a sleeve 51, a valve seat 52, and a switch 53, and the puncture needle assembly 6 includes a puncture needle 61 and a puncture needle cover 62. The air-blocking valve 4 and the integral telescopic sealing member 124 are made of soft rubber materials such as silica gel or rubber, and the support sheet 122 is made of a soft rubber material and has a certain strength such as TPU, etc.

[0038] The sleeve assembly 5 includes a sleeve 51, a valve seat 52 and a switch 53. The switch 53 is provided with a handle 531, a switch through-hole 532, a limit platform 533 and a third cylindrical surface 534. The valve seat 52 is provided with a first cylindrical surface 521, a limit notch 522, a second cylindrical surface 523 and a passage 524. During assembly, the third cylindrical surface 534 on the switch 53 is axially inserted into the first cylindrical surface 521 on the valve seat 52, and the two are in interference fit. By rotating the handle 531 on the switch 53, the switch through-hole 532 on the switch 53 can be rotated to control the opening and closing of the passage 524 on the valve seat 52 according to the position of the switch through-hole 532. At the same time, due to the limit notch 522 provided on the valve seat 52, the upper limit platform 533 of the switch 53 can only rotate within the limit notch 522. In addition, the second cylindrical surface 523 on the valve seat 52 is axially inserted into the sleeve hole 519 on the sleeve 51, and the two are adhesively fitted.

[0039] The sealing assembly 12 is an integral sealing structure, including a sealing upper cover 121, a support piece 122, a sealing lower cover 123 and an integral telescopic seal 124. In this embodiment, eight cylinders 1211 and sealing through-holes 1212 are evenly distributed on the sealing upper cover 121. There are multiple support pieces 122 which enclose to form an annular part. The support piece 122 includes a connecting outer edge and an inclined part fixedly arranged at its bottom. An arc-shaped hole is opened in the center of the inclined part and forms a round hole after enclosure. Two support holes 1221 for passing through support columns are also opened on the connecting outer edge. The sealing lower cover 123 is evenly provided with eight hexagonal hole grooves 1231, and eight round holes 1241 are evenly distributed on the integral telescopic seal 124. The two support holes 1221 opened on the support piece 122 are aligned with the round holes 1241 on the integral telescopic seal 124 in sequence. Four support pieces 122 are axially and evenly superimposed to enclose an annular part, and the bottom surface 1222 of the support piece 122 closely adheres to the inner top surface of the integral telescopic seal 124. Then, the cylinders 1211 on the sealing upper cover 121 are respectively passed through the support holes 1221 on the support piece 122 and the round holes 1241 on the integral telescopic seal 124 and correspondingly inserted into the hole grooves 1231 of the sealing lower cover 123. The cylinders 1211 and the hole grooves 1231 are in interference fit, so as to realize the fixed assembly of the sealing upper cover 121, the support piece 122, the sealing lower cover 123 and the integral telescopic seal 124.

[0040] The integrated telescopic seal 124 is provided with an upper round hole 1244, the diameter of which is smaller than the diameter of the inserted instrument. When the instrument is inserted through this hole, since the integrated telescopic seal 124 is made of a soft material, its upper round hole 1244 is expanded and tightly wraps around the outer wall of the instrument, thus avoiding air leakage. When the instrument is withdrawn, since the four support pieces 122 are evenly distributed, overlapped with each other and closely attached to the inner top surface 1242 of the integrated telescopic seal 124, and the integrated telescopic seal 124 is also evenly provided with reinforcing ribs 1245, the instrument is prevented from turning over the integrated telescopic seal 124, ensuring the sealing performance. When the instrument enters, the support piece 122 can effectively prevent the tip of the instrument from damaging the integrated telescopic seal. Moreover, when the instrument enters, since it first contacts the support pieces arranged in a petal-like layout, the contact area between the integrated telescopic seal and the instrument can be reduced, the clamping force of the integrated telescopic seal on the instrument is decreased, and the resistance of the instrument to enter and exit is greatly reduced.

[0041] The air-blocking seal cover 1 includes a base upper cover 11, a sealing assembly 12, and a base lower cover 13. The base upper cover 11 is provided with a first through hole 111, a second through hole 112, and an annular rib 113. The base lower cover 13 is provided with a third through hole 131, four buckles 132, and an annular rib 133. The sealing assembly 12 is lapped on the annular rib 133 of the base lower cover 13 through the bottom surface 1247 of the clamping groove on the integrated telescopic seal 124. The base upper cover 11 and the base lower cover 13 are axially aligned and fixedly connected together by ultrasonic welding or bonding. After being firmly fixed, the annular rib 113 on the base upper cover 11 tightly presses the annular surface 1246 on the integrated telescopic seal 124 to form an interference fit, and the annular rib 133 on the base lower cover 13 also tightly presses the bottom surface 1247 of the clamping groove on the integrated telescopic seal 124 to form an interference fit, so that there is only one air passage in the air-blocking seal cover 1, that is, from the second through hole 112 on the base upper cover 11 - the sealing through hole 1212 on the sealing upper cover 121 - the inner top through hole 1242 on the integrated telescopic seal 124 - the fourth through hole 1232 on the sealing lower cover 123 - the third through hole 131 on the base lower cover 13. In addition, since the integrated telescopic seal 124 is made of soft rubber material and is provided with a U-shaped annular rib structure, the sealing assembly 12 can move within a certain axial angle in the air-blocking seal cover 1. This facilitates the instrument to rotate within a certain axial angle when inserted through this passage.

[0042] The air-blocking valve 4 is sleeved on the annular rib 511 of the sleeve 51 through a clamping groove 43, wherein the annular bottom surface of the clamping groove 43 is in close fit with the top surface of the annular rib 511. When the air-blocking valve 4 is pressed, the air-blocking valve 4 and the sleeve 51 form an interference fit, thus playing a sealing role.

[0043] The clamp assembly 3 comprises a left clamp 31, a torsion spring 32, and a right clamp 33. The assembly is as follows: the torsion spring 32 is axially inserted into the main cylinder 333 on the right clamp 33, with one end 321 of the torsion spring 32 snapping into the slot 334 on the right clamp 33. The left clamp 31 is then snapped into the main cylinder 333 on the right clamp 33 via the circular hole 313 on the left clamp 31 through the undercut 337 on the right clamp 33. The diameter of the undercut 337 is larger than the diameter of the circular hole 313, so the undercut 337 acts as a limiter, preventing the left clamp 31 from falling off the main cylinder 333 on the right clamp 33. After assembly, the clamp assembly 3 can be rotated about the axis of the main cylinder 333 on the right clamp 33 by squeezing the left protruding block 315 on the left clamp 31 and the right protruding block 336 on the right clamp 33.

[0044] The clamp assembly 3 is mounted within the cylindrical hole 512 of the sleeve 51 via the cylindrical structure 331 on the right clamp 33. Simultaneously, the first bottom surface 311 of the left clamp 31 and the second bottom surface 332 of the right clamp 32 rest on the reinforcing rib 513 of the sleeve 51, thereby securing the clamp assembly 3 to the sleeve assembly 51. A clearance notch 518 is provided on the sleeve 51 to facilitate the passage of the clamp assembly 3 through the clearance notch 518. The sleeve 51 is also provided with a limiting rib 515 to limit the inner arc surface 317 of the left clamp 31 and the inner arc surface 339 of the right clamp 33, respectively.

[0045] The pressure plate 2 is provided with an escape notch 26, an escape hole 27, a first limiting surface 28, a second limiting surface 29, four snap-fit holes 23, a channel hole 24, and a positioning post 25. The positioning post 25 is inserted into a cylindrical hole 517 in the sleeve 51 to achieve temporary positioning of the pressure plate 2. The sleeve 51 has a weld line 514, which is ultrasonically welded to the weld groove 21 in the pressure plate 2. The pressure plate 2 is provided with a clearance gap 26, a first limiting surface 28 and a second limiting surface 29, and the clamp assembly 3 passes through the clearance gap 26. At the same time, the left protruding block 315 on the left clamp 31 is close to the first limiting surface 28 on the pressure plate 2, and the right protruding block 336 on the right clamp 33 is close to the second limiting surface 29 on the pressure plate 2. When the pressure plate 2 is welded to the sleeve 51, the air-blocking valve 4 is compressed in the axial direction, that is, the annular rib 511 on the sleeve 51 and the annular bottom surface of the groove 43 produce an interference, thereby realizing the above-mentioned sealing effect of the sleeve 51 and the air-blocking valve 4.

[0046] At this time, the pressing plate 2, the clamp assembly 3, the air blocking valve 4 and the sleeve assembly 5 are assembled together to form the large sleeve assembly M. When the air blocking seal cover 1 is assembled with the large sleeve assembly M, the air blocking seal cover 1 - the base lower cover 13 - the four buckles 132 are correspondingly inserted into the four buckle through holes 23 of the large sleeve assembly M - the pressing plate 2. At this time, the arc top surfaces of the four buckles 132 on the base lower cover 13 respectively press down the inclined surface structures 318 on the left clamp 31 and the inclined surface structures 340 on the right clamp 33. Under the action of the downward pressure of the buckles, the left clamp 31 on the clamp assembly 3 rotates counterclockwise around the axis of the main cylinder 333 on the right clamp 33, and the right clamp 33 on the clamp assembly 3 rotates clockwise around the axis of the main cylinder 333, that is, at this time the clamp assembly 3 is in an open state. When the large sleeve assembly M is further pressed down, the buckle contact surfaces 1321 of the four buckles 132 on the base lower cover 13 are respectively buckled on the third bottom surface 314, the fourth bottom surface 316 of the left clamp 31 and the fifth bottom surface 335, the sixth bottom surface 338 of the right clamp 33. After releasing the hand, at this time the air blocking seal cover 1 no longer bears the downward pressure. Under the action of the torsion spring 32, the left clamp 31 and the right clamp 33 respectively rotate clockwise and counterclockwise around the axis of the main cylinder 333 on the right clamp, so that the clamp assembly 3 is in a closed state. Thus, the air blocking seal cover 1 is buckled on the large sleeve assembly M.

[0047] When it is necessary to disassemble the air blocking seal cover, the left protruding block 315 on the left clamp and the right protruding block 336 on the right clamp can be pinched with fingers to make the clamp assembly 3 in an open state, and then the air blocking seal cover 1 can be pulled out upward with the other hand.

[0048] In addition, the product is equipped with a puncture rod assembly 6, including a puncture needle 61 and a puncture needle cover 62. Four positioning columns 611, a positioning boss 612, a cutting edge 613 and a puncture rod 614 are provided on the puncture needle 61. A hexagonal hole groove 621 is provided on the puncture needle cover 62. When the two are assembled, the four positioning columns 611 on the puncture needle 61 are correspondingly inserted into the hexagonal hole groove 621 on the puncture needle cover 62, and the two are in an interference fit. When the puncture rod assembly 6 is axially inserted into the air blocking seal cover 1 and the large sleeve assembly M, rotating the puncture rod assembly 6 can make the positioning boss 612 on the puncture needle 61 be stuck in the first through hole 111 on the base upper cover 11 to achieve the positioning effect. At the same time, the cutting edge 613 on the puncture needle 61 can assist in puncturing the skin.

[0049] If words such as "first" and "second" are used to limit components in this patent, those skilled in the art should know that the use of "first" and "second" is only for the convenience of describing the present invention and simplifying the description, and these words have no special meaning.

[0050] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and all these changes and improvements fall within the scope of the invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "front", "rear", "left", "right", "center", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the protected content of the present invention.

Claims

1. A trocar for laparoscopy, characterized in that: It includes a gas-blocking seal cover, a pressing plate, a clamp assembly, a gas-blocking valve, a sleeve assembly, and a puncture needle assembly. The gas-blocking seal cover includes a base upper cover, a base lower cover, and a sealing assembly disposed between the two. The sealing assembly overlaps on the base lower cover, and the base upper cover and the base lower cover are axially aligned and fixedly connected; The sealing assembly includes a sealing upper cover, a support piece, an integral telescopic seal, and a sealing lower cover. The sealing upper cover is convexly provided with a support post that passes through the through holes respectively formed in the support piece, the integral telescopic seal, and the sealing lower cover, and the support piece is closely attached to the inner top surface of the integral telescopic seal; An upper round hole with a diameter smaller than the diameter of the inserted instrument is also formed in the center of the integral telescopic seal; The sleeve assembly includes a sleeve, a valve seat, and a switching device that is in interference fit with the valve seat. The switching device is provided with a limit platform and rotates only in the limit notch provided on the valve seat; The gas-blocking valve is sleeved on the annular rib disposed in the sleeve through a provided card slot to form an interference fit. The pressing plate is fixedly arranged on the sleeve and axially compresses the gas-blocking valve, and the clamp assembly is clamped on the sleeve; During assembly, the puncture needle assembly axially penetrates into the large sleeve assembly formed by the cooperation of the gas-blocking seal cover, the pressing plate, the clamp assembly, the gas-blocking valve, and the sleeve assembly, and is rotationally clamped and positioned in the base upper cover.

2. The trocar for laparoscope according to claim 1, wherein: A plurality of the support pieces are provided and enclose a ring-shaped member. The support piece includes a connecting outer eaves and an inclined portion provided at its bottom. An arc-shaped hole is formed in the center of the inclined portion and forms an upper round hole after enclosure. A support hole for passing through the support post is also formed in the connecting outer eaves.

3. A trocar for laparoscopy according to claim 1, characterized in that: Both the base upper cover and the base lower cover are provided with annular ribs. The annular rib on the base upper cover tightly presses the annular surface of the integral telescopic seal to form an interference fit, and the annular rib on the base lower cover tightly presses the bottom surface of the card slot of the integral telescopic seal to form an interference fit; A plurality of buckles for limiting the clamp assembly are downwardly extended and arranged on the lower end surface of the base lower cover.

4. The trocar for laparoscope according to claim 3, wherein: The clamp assembly includes a left clamp, a right clamp that are rotatably arranged, and a torsion spring disposed between the two. The left clamp and the right clamp are limited and arranged on the sleeve of the sleeve assembly; The torsion spring is axially sleeved on the main cylinder provided on the right clamp and drives the clamp assembly to rotate around the cylinder axis on the right clamp under the action of an external force.

5. A trocar for laparoscopy according to claim 3, characterized in that: The lower end of the pressing plate is provided with an avoidance notch for passing through the clamp assembly and a positioning post for plugging and positioning with the sleeve. A buckle through hole for passing through the buckle is also formed on the upper end surface of the pressing plate.

6. A trocar for laparoscopy according to claim 4, characterized in that: After the pressing plate, the clamp assembly, the gas-blocking valve, and the sleeve assembly are assembled, they form a large sleeve assembly M. The large sleeve assembly M is assembled with the gas-blocking seal cover, and the buckles on the base lower cover of the gas-blocking seal cover are correspondingly inserted into the buckle through holes of the pressing plate in the large sleeve assembly M; The arc-shaped top surfaces of the buckles respectively press down the inclined surface structures of the left clamp and the right clamp. Under the downward pressure of the buckles, the left clamp rotates counterclockwise around the cylinder axis of the right clamp, and the right clamp rotates clockwise around the cylinder axis and is in an open state; When the large sleeve assembly M is further pressed down, the buckle contact surfaces of the buckles are respectively correspondingly buckled on the bottom surfaces of the left clamp or the right clamp, After the hand is released, the air-blocking seal cover no longer bears the downward pressure. Under the action of the torsion spring, the left clamp and the right clamp rotate around the cylinder on the right clamp respectively and are in a closed state. The air-blocking seal cover is buckled on the sleeve assembly M.

7. A trocar for laparoscopy according to claim 1, characterized in that: The puncture needle assembly includes a puncture needle and a puncture needle cover. A positioning post and a positioning boss are provided at the end of the puncture needle, and a puncture rod and a blade are correspondingly provided at the head end of the puncture needle. The puncture needle cover is provided with a hexagonal hole groove and is in interference fit with the end of the puncture needle.

8. A trocar for laparoscopy according to any one of claims 1 to 7, characterized in that: A welding wire is further provided on the sleeve, and a welding groove is correspondingly provided on the pressing plate. The pressing plate is welded on the sleeve and axially compresses the air-blocking valve.

9. A trocar for laparoscopy according to claim 8, characterized in that: Both the air-blocking valve and the integral telescopic seal are made of soft rubber material.

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