Diameter-variable dilatation puncture cannula device

Abstract

The utility model discloses a variable-diameter expansion puncture cannula device, which belongs to the technical field of medical equipment and comprises an air closed valve cover, an expansion variable-diameter main body, an inner fixing support, a variable-diameter support and a variable-diameter rubber sleeve. The inner fixing support and the bottom wall of the expansion variable-diameter body sequentially penetrate to form a through hole, and a plurality of grooves are formed in the bottom wall of the inner fixing support in the circumferential direction. The variable-diameter support is defined by a plurality of variable-diameter pieces, and each variable-diameter piece comprises a fixing part and an expanding part. And after one end of the reducing rubber sleeve is fixed in the expansion reducing main body, the other end of the reducing rubber sleeve extends out of the expansion reducing main body from the through hole and covers the peripheries of the expansion parts. The expansion part of the puncture cannula device is composed of a plurality of variable-diameter pieces and a variable-diameter rubber sleeve wrapping the variable-diameter support. Due to the fact that the variable-diameter support and the variable-diameter rubber sleeve are arranged in a split mode, the puncture cannula can play a rigid role of the variable-diameter support and a flexible role of the variable-diameter rubber sleeve at the same time, and the application range of the puncture cannula device is enlarged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical equipment, and specifically relates to a variable-diameter expansion puncture cannula device. BACKGROUND

[0002] In the medical operation process, the puncture cannula device is one of the commonly used and important medical instruments, especially widely used in minimally invasive surgery. The puncture cannula device is usually composed of a cannula assembly and a puncture needle, and is used to establish an artificial channel into the body cavity. Its basic operation process is: a small opening is cut on the patient's skin so that the cannula assembly can pass through, the puncture needle passes through the cannula assembly, and penetrates the abdominal wall into the body cavity through the skin opening. Once entering the body cavity, the puncture needle is removed, and the cannula assembly is left as a channel for surgical instruments to enter and exit the body cavity.

[0003] However, the existing puncture cannula device has some deficiencies. For example, the existing cannula device often has a fixed diameter, which is difficult to flexibly adapt to the needs of different operations. In actual operation, different types and sizes of surgical instruments need to pass through the cannula assembly to enter the body cavity, and the fixed-diameter cannula device may limit the use of certain surgical instruments, affecting the flexibility and efficiency of the operation.

[0004] The utility model with the application number 201610673361.1 discloses a variable-diameter puncture cannula, which is integrally formed with a valve body and a locking cover, and the expansion of the cannula is realized only by the deformation of the puncture cannula itself. Since the puncture cannula needs to realize both the support function and the expansion function, the material used for the puncture cannula needs to have a certain rigidity to ensure the stability of the puncture device during the operation, and also needs to have a certain flexibility to ensure that the puncture cannula will deform to expand, so that the material used for the puncture cannula is required to be high, and the puncture cannula also has many limitations in actual application. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a variable-diameter expansion puncture cannula device to solve the problems in the prior art.

[0006] A variable-diameter expansion puncture cannula device is provided, which comprises:

[0007] An air closing valve cover;

[0008] An expansion variable-diameter main body, which is detachably connected with the air closing valve cover;

[0009] An internal fixing support, which is arranged inside the expansion variable-diameter main body, and the bottom wall of the internal fixing support and the expansion variable-diameter main body is sequentially perforated, and the bottom wall of the internal fixing support is circumferentially formed with a plurality of grooves;

[0010] The variable-diameter support is formed by a plurality of variable-diameter pieces, the variable-diameter pieces include fixed parts and expansion parts, the fixed parts are limited in corresponding grooves, and the expansion parts extend from the through holes to the outside of the expansion variable-diameter body in a surrounding manner.

[0011] The variable-diameter rubber sleeve is fixed at one end of the expansion variable-diameter body and extends from the through hole to the outside of the expansion variable-diameter body and covers the periphery of the expansion parts.

[0012] As a further scheme of the utility model, the variable-diameter sleeve fixing assembly is used for fixing the end of the variable-diameter rubber sleeve between the inner fixed support and the expansion variable-diameter body in a circumferential direction. The end of the variable-diameter rubber sleeve is fixed in the expansion variable-diameter body through the variable-diameter sleeve fixing assembly, so that the hidden design of the variable-diameter rubber sleeve is realized, and the wear and damage of the variable-diameter rubber sleeve caused by external influences are reduced.

[0013] As a further scheme of the utility model, the variable-diameter sleeve fixing assembly includes two fixed clamping pieces, the fixed clamping pieces are provided with a plurality of tooth columns and a plurality of tooth grooves in a circumferential direction, and when the end of the variable-diameter rubber sleeve is clamped between the two fixed clamping pieces, the plurality of tooth columns penetrate the variable-diameter rubber sleeve and are mutually embedded in the corresponding tooth grooves. The variable-diameter rubber sleeve is pressed between the two fixed clamping pieces, so that the sealing effect of the variable-diameter rubber sleeve is further enhanced. The tooth columns fix the variable-diameter rubber sleeve in a penetrating form, and the variable-diameter rubber sleeve is limited through the friction force and the limiting of the tooth columns, so that the firmness is enhanced. The cooperation of the tooth columns and the tooth grooves can limit the rotational freedom degree between the two fixed clamping pieces, so that the two fixed clamping pieces are prevented from moving mutually.

[0014] As a further scheme of the utility model, the groove is formed by recessing the bottom wall of the inner fixed support inwardly, the fixed part is clamped between the inner fixed support and the variable-diameter sleeve fixing assembly after being embedded in the inside of the groove, and the top wall of the inner fixed support abuts against the air closing valve cover. The fixed part is the main fixed structure of the variable-diameter support, a containing space is formed between the inner fixed support and the variable-diameter sleeve fixing assembly through the groove, so that the fixed part is contained and clamped, and the fixed part is prevented from moving during the deformation of the variable-diameter piece. The inner fixed support is pressed by the air closing valve cover, the variable-diameter sleeve fixing assembly is pressed by the inner fixed support, and the fixed part is reversely pressed by the variable-diameter sleeve fixing assembly, so that the structures are mutually linked, and the compactness of the structure is improved.

[0015] As a further scheme of the utility model: the variable diameter sheet extends outwardly in the direction different from the expansion part to form a flange plate, which is used to stop the flange plate on the inner wall of the internal fixation support or the inner wall of the air closing valve cover when the variable diameter support retreats in the puncture direction. When the variable diameter puncture needle or the expansion tube needs to be withdrawn from the puncture sleeve device, the flange plate is set as a limiting component to prevent the variable diameter support from being pulled into the inside of the expansion variable diameter body, so that the variable diameter support is stopped on the inner wall of the internal fixation support or the inner wall of the air closing valve cover when it retreats, thereby enhancing the stability of the variable diameter support.

[0016] As a further scheme of the utility model: the internal fixation support is provided with a limiting plate on both sides of the flange plate. The limiting plate can limit both sides of the flange plate, can improve the torsional resistance of the variable diameter support as a whole, and can reduce the torsional deformation of the variable diameter sheet when it is subjected to the torsional force of the puncture needle or the expansion tube.

[0017] As a further scheme of the utility model: the expansion part comprises a deformation part and a support part, the support part and the fixed part are structurally transitioned through the deformation part, and a plurality of the deformation parts form a tapered transition structure outside the puncture hole. When the puncture needle or the expansion tube penetrates the variable diameter support, the variable diameter sheet is deformed through the deformation part, so that a plurality of support parts are away from each other to achieve the effect of expansion. The deformation part in the tapered structure is located outside the puncture hole, so that the deformation part can maximize the deformation effect, that is, the variable diameter support can maximize the expansion under the limitation of the puncture hole, thereby increasing the expansion range.

[0018] As a further scheme of the utility model: a plurality of the support parts can be mutually attached to form a tubular structure, and a continuous anti-skid texture is formed on the periphery of the tubular structure. The anti-skid texture can improve the bonding strength of the support part and the variable diameter rubber sleeve, and prevent the variable diameter support from slipping and moving during the expansion process.

[0019] As a further scheme of the utility model: the internal fixation support and the expansion variable diameter body are provided with a buckle structure. The buckle structure can limit the rotational freedom degree between the internal fixation support and the expansion variable diameter body, prevent the relative rotation between the internal fixation support and the expansion variable diameter body, and prevent the torsional deformation of the variable diameter support and the variable diameter rubber sleeve.

[0020] As a further scheme of the utility model: the end of the variable diameter support formed by a plurality of the variable diameter sheets is in a conical spike structure. The conical spike structure increases the pressure intensity when the end of the variable diameter support is pressed, which is conducive to the variable diameter support being driven by the variable diameter puncture needle to pierce into the incision, and reduces the damage of the variable diameter support to the surrounding tissues during the puncture process.

[0021] Compared with the prior art, the utility model has the beneficial effects that:

[0022] 1. The expansion part of the puncture cannula device is composed of a plurality of variable-diameter pieces and a variable-diameter rubber sleeve wrapped outside the variable-diameter support, and the expansion effect in a sealed state is formed by the expansion of the plurality of variable-diameter pieces and the wrapping of the variable-diameter rubber sleeve. Since the variable-diameter support and the variable-diameter rubber sleeve are separately arranged, the puncture cannula can simultaneously play the rigid role of the variable-diameter support and the flexible role of the variable-diameter rubber sleeve, thereby increasing the application scenarios of the puncture cannula device.

[0023] 2. The end part of the variable-diameter rubber sleeve is designed in a hidden manner, which effectively protects the end part of the variable-diameter rubber sleeve from being damaged by the external environment. The variable-diameter support and the variable-diameter rubber sleeve are both limited inside the expansion variable-diameter main body, and the air closing valve cover is used as a penetrating fitting part of the puncture needle or the expansion tube, so that the sealing performance of the device as a whole is good. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the drawings, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings shown.

[0025] Figure 1 It is a sectional structure schematic view of a variable-diameter expansion puncture cannula device.

[0026] Figure 2 It is an explosion structure schematic view of a variable-diameter expansion puncture cannula device.

[0027] Figure 3 It is Figure 1 It is an enlarged view of area A in the middle.

[0028] Figure 4 It is a structure schematic view of an internal fixation support provided by the utility model.

[0029] Figure 5 It is a partial structure schematic view of a puncture cannula device provided by the utility model.

[0030] Figure 6 It is a structure schematic view of a variable-diameter support provided by the utility model.

[0031] Figure 7 It is a working state view of a variable-diameter sleeve fixing assembly provided by the utility model.

[0032] Figure 8 It is a working state view of an air closing valve cover provided by the utility model.

[0033] In the figure: 1, air closing valve cover; 2, expansion reducing body; 3, internal fixed support; 31, groove; 32, limiting plate; 4, reducing support; 41, reducing sheet; 411, fixed part; 412, expansion part; 4121, deformation part; 4122, support part; 413, flange plate; 5, reducing rubber sleeve; 6, perforation; 7, reducing sleeve fixing assembly; 71, fixed clamping piece; 72, tooth column; 73, tooth groove; 8, buckle structure. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is described and explained below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application. Based on the examples provided in the present application, all other examples obtained by those of ordinary skill in the art without making creative efforts fall within the scope of the present application.

[0035] It is obvious that the drawings described below are only some examples or embodiments of the present application, and for those of ordinary skill in the art, the present application can also be applied to other similar scenarios without making creative efforts on the basis of these drawings. In addition, it can be understood that although the efforts made in the development process may be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some design, manufacture or production changes made on the basis of the technical content disclosed in the present application are only routine technical means, and should not be understood as insufficient disclosure of the content disclosed in the present application.

[0036] However, there will be cases of omission of unnecessary detailed description. For example, there are cases of omission of detailed description of well-known matters, repeated description of practically identical structures. This is to avoid the following description from becoming unnecessarily lengthy, facilitating understanding by those skilled in the art. In addition, the drawings and the following description are provided for those skilled in the art to fully understand the present application, and are not intended to limit the subject matter recited in the claims.

[0037] Please refer to Figure 1 , Figure 2 , Figure 4 and Figure 6As shown, the utility model discloses a variable diameter expansion puncture casing device, including air closed valve cover 1, expansion variable diameter main part 2, internal fixed support 3, variable diameter support 4 and variable diameter rubber sleeve 5. Expansion variable diameter main part 2 and air closed valve cover 1 between are detachably connected. Internal fixed support 3 is arranged at the inside of expansion variable diameter main part 2, and the bottom wall of internal fixed support 3 and expansion variable diameter main part 2 is sequentially perforated to form perforation 6, and the bottom wall of internal fixed support 3 is formed with a plurality of grooves 31 along the circumference. Variable diameter support 4 is formed by a plurality of variable diameter sheets 41, and the variable diameter sheet 41 includes a fixed part 411 and an expansion part 412, a plurality of fixed parts 411 are limited in the corresponding groove 31, and a plurality of expansion parts 412 extend from the perforation 6 to the outside of the expansion variable diameter main part 2 and are enclosed. The variable diameter rubber sleeve 5 is fixed to the inside of the expansion variable diameter main part 2 at one end, and the other end extends from the perforation 6 to the outside of the expansion variable diameter main part 2 and is covered on the periphery of the plurality of expansion parts 412.

[0038] As shown in the drawings, Figure 1 And Figure 8 As shown, air closed valve cover 1 mainly includes two parts of cover body and valve body. The cover body is made of hard material, and is matched with expansion variable diameter main part 2 to form the shell part of the puncture casing device. The valve body is made of elastic material such as silica gel, when the variable diameter puncture needle pierces into the valve body, the valve body deforms and tightly fits on the surface of the variable diameter puncture needle to play a sealing role, preventing air from entering and exiting. Expansion variable diameter main part 2 and air closed valve cover 1 can be threadedly connected, so that they can be detached, facilitating the inspection and maintenance of internal parts. Perforation 6 is the channel for the extension of variable diameter support 4 and variable diameter rubber sleeve 5 to the outside of the device shell, and at the same time, perforation 6 is the channel for guiding the puncture needle or variable diameter tube to the direction of variable diameter support 4.

[0039] The structure sequence of the puncture casing device is that a plurality of variable diameter sheets 41 are enclosed together to form tubular variable diameter support 4, and variable diameter rubber sleeve 5 is sleeved on the periphery of variable diameter support 4 to stabilize the shape of variable diameter support 4. Variable diameter support 4 and variable diameter rubber sleeve 5 pass through the perforation 6 of expansion variable diameter main part 2, and the end of variable diameter rubber sleeve 5 is fixed with the inner wall of expansion variable diameter main part 2. The internal fixed support 3 is placed into the expansion variable diameter main part 2, so that the fixed part 411 on each variable diameter sheet 41 is matched with the groove 31 at the bottom of the internal fixed support 3, and the internal fixed support 3 presses the fixed part 411 on the inner wall of the expansion variable diameter main part 2, so that the variable diameter support 4 and the variable diameter rubber sleeve 5 are fixed. Finally, air closed valve cover 1 is covered with expansion variable diameter main part 2.

[0040] The working process of the puncture cannula device is that the diameter-changing puncture needle is pierced into the valve body on the air closing valve cover 1 and continuously advances to the direction of the puncture hole 6, when the diameter-changing puncture needle is pierced into the middle gap of the diameter-changing support 4 and travels along the length direction of the diameter-changing support 4, each expansion part 412 expands gradually away from each other along the length direction of the diameter-changing support 4, and at the same time, the diameter-changing rubber sleeve 5 is elastically deformed and expanded synchronously under the expansion of the expansion parts 412, and finally the diameter-changing puncture needle is pierced out from the end of the diameter-changing support 4. When the diameter-changing puncture needle is assembled with the puncture cannula device, the puncture needle at the front end of the device is pierced into the incision, the puncture cannula is gradually guided into the abdominal cavity along with the deepening of the puncture needle, and then the diameter-changing puncture needle is taken out, and other surgical instruments can be operated.

[0041] The puncture cannula device provided by the utility model can expand in diameter and be applied to different surgical scenes. Since the diameter-changing support 4 and the diameter-changing rubber sleeve 5 are in a split type, each diameter-changing sheet 41 can be made of a rigid material, so that the diameter-changing support 4 can stably support the incision and stand in the abdominal cavity. The diameter-changing rubber sleeve 5 is made of an elastic material that is easy to deform, can limit the shape of the diameter-changing support 4 after expansion, and plays a role of overall sealing, so as to complete the operation of filling carbon dioxide gas into the abdominal cavity.

[0042] Please refer to Figure 1 As shown in the figure, the puncture cannula device further comprises a diameter-changing sleeve fixing assembly 7, which is used for fixing the end of the diameter-changing rubber sleeve 5 between the inner fixing support 3 and the expansion diameter-changing body 2 in the circumferential direction, that is, the diameter-changing rubber sleeve 5 can be fixed in the expansion diameter-changing body 2 through an additional fixing part, so as to provide a fixed force point for the diameter-changing rubber sleeve 5. The diameter-changing rubber sleeve 5 can comprise an integral rigid part and an elastic part, the rigid part is used for cooperating with the diameter-changing sleeve fixing assembly 7, so as to improve the strength and firmness of the fixing, and the elastic part is used for covering the periphery of the diameter-changing support 4 to realize the expansion function.

[0043] Specifically, please refer to Figure 1 and Figure 7 As shown in the figure, the diameter-changing sleeve fixing assembly 7 comprises two fixed clamping pieces 71, which are in the form of a circular ring, and the center of the circular ring is part of the puncture hole 6. The fixed clamping piece 71 is provided with a plurality of tooth columns 72 and a plurality of tooth grooves 73 in the circumferential direction, and the tooth columns 72 and the tooth grooves 73 on each fixed clamping piece 71 can be arranged in a ring matrix in a certain arrangement order. When the end of the diameter-changing rubber sleeve 5, that is, the rigid part, is clamped between the two fixed clamping pieces 71, the plurality of tooth columns 72 penetrate the diameter-changing rubber sleeve 5 and are embedded in the corresponding tooth grooves 73. The fixing of the diameter-changing rubber sleeve 5 is divided into two parts, one is to provide a larger friction force for the diameter-changing rubber sleeve 5 through the mutual pressing of the two fixed clamping pieces 71, and the other is to limit the diameter-changing rubber sleeve 5 through the blocking of the tooth columns 72.

[0044] Please refer to Figure 1 ,Figure 2 , Figure 4 and Figure 6 As shown, after the two fixing clips 71 fix the variable diameter sleeve 5, the two are clamped together between the inner fixing bracket 3 and the expansion variable diameter body 2, and the inner fixing bracket 3 provides a pressing force to the two fixing clips 71. At this time, while the fixing part 411 on the variable diameter piece 41 is embedded in the groove 31, the inner fixing bracket 3 presses the fixing part 411 against the surface of the variable diameter sleeve fixing assembly 7.

[0045] Specifically, please refer to Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the groove 31 is formed by recessing part of the bottom wall of the inner fixation bracket 3 into the interior of the inner fixation bracket 3. After the fixing part 411 is embedded in the groove 31, it is clamped between the inner fixation bracket 3 and the variable diameter sleeve fixing assembly 7. At this time, the pressing force of the fixing part 411 and the pressing force of the variable diameter sleeve fixing assembly 7 are provided by the inner fixation bracket 3 and the expansion variable diameter body 2. There are two methods to provide the pressing force of the inner fixation bracket 3. One is that the inner fixation bracket 3 is fixed to the expansion variable diameter body 2 through the snap-fit ​​structure 8, so that the reaction force between the two acts on the fixing part 411 and the variable diameter sleeve fixing assembly 7. The other is that the top wall of the inner fixation bracket 3 abuts against the air shut-off valve cover 1, and the reaction force provided between the air shut-off valve cover 1 and the expansion variable diameter body 2 acts on the inner fixation bracket 3, the fixing part 411, and the variable diameter sleeve fixing assembly 7.

[0046] Please see Figure 1 and Figure 6 As shown, the reducing plate 41 extends outward in a direction different from the expansion portion 412 to form a flange plate 413. This flange plate 413 is used to abut against the inner wall of the internal fixation bracket 3 or the inner wall of the air shut-off valve cover 1 when the reducing bracket 4 retracts towards the perforation 6. When the reducing puncture needle or expansion tube is retracted from the puncture cannula device, the flange plate 413 will move a certain distance towards the inner wall of the internal fixation bracket 3 and the inner wall of the air shut-off valve cover 1. When the flange plate 413 contacts the internal fixation bracket 3 or the air shut-off valve cover 1, it can act as a limit, preventing the reducing bracket 4 from being pulled into the expansion reducing body 2 and enhancing the stability of the reducing bracket 4. Furthermore, the flange plate 413 can enhance the strength of the connection node between the fixing portion 411 and the expansion portion 412, reduce local stress at the connection node, and prevent node breakage.

[0047] Further, please refer to Figure 2 , Figure 5 and Figure 6As shown, the inner fixing support 3 is provided with a limiting plate 32 on each side of the flange plate 413. The limiting plate 32 can limit the two sides of the flange plate 413, and can limit the flange plate 413 on each variable diameter sheet 41 within the range of the inner fixing support 3. This structure is equivalent to adding a lateral limiting structure to the connecting node between the fixed part 411 and the expansion part 412, which can improve the torsional resistance of the variable diameter support 4 as a whole, and reduce the torsional deformation of the variable diameter sheet 41 when subjected to the torsional force of the puncture needle or the expansion tube.

[0048] As shown in Figure 1 and Figure 6 As shown, the expansion part 412 includes a deformation part 4121 and a support part 4122, one end of the deformation part 4121 is connected with the fixed part 411, and the other end is connected with the support part 4122. The plurality of deformation parts 4121 form a tapered transition structure outside the puncture hole 6. When the puncture needle passes through between the plurality of support parts 4122, the plurality of support parts 4122 move in the radial direction away from each other, and the support part 4122 drives the corresponding deformation part 4121 to deform. The plurality of deformation parts 4121 arranged in a tapered structure are located outside the puncture hole 6, and when the support part 4122 expands, the deformation part 4121 flips relative to the fixed part 411, the tapered diameter of the part connected with the support part 4122 of the deformation part 4121 gradually increases, and the deformation part 4121 gradually moves to the side wall of the part where the expansion variable diameter main body 2 is located in the puncture hole 6. This deformation mode makes full use of the hole diameter of the puncture hole 6, so that the expansion hole diameter of the expansion part 412 can be maximized to tend to the hole diameter of the puncture hole 6, and the expansion range of the expansion part 412 is increased.

[0049] As shown in Figure 1 and Figure 6 As shown, the plurality of support parts 4122 can be in close contact to form a tubular structure, and the periphery of the tubular structure forms a continuous anti-skid texture. The anti-skid texture can improve the bonding strength of the support part 4122 and the variable diameter rubber sleeve 5, and prevent the variable diameter support 4 from slipping and moving during the expansion process.

[0050] As shown in Figure 2 and Figure 5 As shown, the inner fixing support 3 and the expansion variable diameter main body 2 are provided with a buckle structure 8. The buckle structure 8 can limit the rotational freedom between the inner fixing support 3 and the expansion variable diameter main body 2, and prevent the relative rotation between the inner fixing support 3 and the expansion variable diameter main body 2 from causing the variable diameter support 4 and the variable diameter rubber sleeve 5 to be twisted and deformed.

[0051] As shown in Figure 1 and Figure 6As shown, the end of the tapering stent 4 formed by the several tapering pieces 41 is in a conical structure. The conical structure increases the pressure intensity of the end of the tapering stent 4 when pressed, which is beneficial for the tapering stent 4 to be driven by the tapering puncture needle to pierce into the incision, and reduces the damage to the surrounding tissue caused by the tapering stent 4 during the puncture process.

[0052] It should be noted that the present application is not limited to the above-described embodiments. The above-described embodiments are only examples, and embodiments having substantially the same configuration and playing the same role and effect as the technical idea within the scope of the technical solutions of the present application are all included in the technical scope of the present application. In addition, within the scope of the main idea of the present application, various modifications that can be thought of by those skilled in the art are applied to the embodiments, and other modes constructed by combining part of the constituent elements of the embodiments are also included in the scope of the present application.

Claims

1. A variable diameter dilatation cannula device, characterized by, It includes: Air closing valve cover (1); Expansion variable diameter body (2), which is detachably connected between air closing valve cover (1); Internal fixed support (3) is arranged in the inside of expansion variable diameter body (2), the bottom wall of internal fixed support (3) and expansion variable diameter body (2) are sequentially penetrated to form perforation (6), the bottom wall of internal fixed support (3) is formed with a plurality of grooves (31) along the circumference; Variable diameter support (4) is formed by a plurality of variable diameter sheets (41), the variable diameter sheet (41) includes fixed part (411) and expansion part (412), a plurality of fixed parts (411) are limited in the corresponding groove (31), a plurality of expansion parts (412) extend from the inside of perforation (6) to the outside of expansion variable diameter body (2) and are enclosed. Variable diameter rubber sleeve (5), one end of variable diameter rubber sleeve (5) is fixed in the inside of expansion variable diameter body (2), the other end extends from the inside of perforation (6) to the outside of expansion variable diameter body (2) and is covered on the periphery of a plurality of expansion parts (412).

2. The variable diameter dilatation trocar device according to claim 1, wherein, It also includes variable diameter sleeve fixing assembly (7) for fixing the end of variable diameter rubber sleeve (5) between internal fixed support (3) and expansion variable diameter body (2) along the circumference.

3. A variable diameter dilatation cannula device according to claim 2, wherein, The variable diameter sleeve fixing assembly (7) includes two fixed clamping pieces (71), the fixed clamping piece (71) is provided with a plurality of tooth columns (72) and a plurality of tooth grooves (73) along the circumference, when the end of the variable diameter rubber sleeve (5) is clamped between the two fixed clamping pieces (71), a plurality of tooth columns (72) penetrate the variable diameter rubber sleeve (5) and are mutually embedded with the corresponding tooth grooves (73).

4. The variable diameter dilatation trocar device of claim 2, wherein, The groove (31) is formed by recessing the bottom wall of the internal fixed support (3) to the inside, the fixed part (411) is embedded in the inside of the groove (31) and clamped between the internal fixed support (3) and the variable diameter sleeve fixing assembly (7), the top wall of the internal fixed support (3) abuts with the air closing valve cover (1).

5. The variable diameter dilatation trocar device of claim 1, wherein, The variable diameter sheet (41) extends outward to form a flange plate (413) in a direction different from the expansion part (412), so that when the variable diameter support (4) retreats in the direction of the perforation (6), the flange plate (413) abuts against the inner wall of the internal fixed support (3) or the inner wall of the air closing valve cover (1).

6. A variable diameter dilatation cannula device according to claim 5, wherein, The internal fixed support (3) is provided with a limiting plate (32) on both sides of the flange plate (413).

7. The variable diameter dilatation trocar device of claim 1, wherein, The expansion part (412) includes deformation part (4121) and support part (4122), the support part (4122) and the fixed part (411) are structurally transitioned through the deformation part (4121), a plurality of deformation parts (4121) form a tapered transition structure outside the perforation (6).

8. A variable diameter dilatation cannula device according to claim 7, wherein, A plurality of support parts (4122) can be mutually attached to form a tubular structure, and the periphery of the tubular structure forms a continuous anti-skid texture.

9. A variable diameter dilatation trocar device according to any one of claims 1-8, wherein, The internal fixed support (3) and the expansion variable diameter body (2) are provided with a buckle structure (8).

10. A variable diameter dilatation cannula device according to any one of claims 1-8, characterized in that, The end of the variable diameter support (4) formed by a plurality of variable diameter sheets (41) encloses a conical spike structure.

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