CN110960293B

CN110960293B - Puncture sleeve

Info

Publication number: CN110960293B
Application number: CN201811153575.1A
Authority: CN
Inventors: 孙宝峰; 黄晔
Original assignee: Fengh Medical Co ltd
Current assignee: Fengh Medical Co ltd
Priority date: 2018-09-29
Filing date: 2018-09-29
Publication date: 2023-07-11
Anticipated expiration: 2038-09-29
Also published as: CN110960293A

Abstract

The invention discloses a puncture sleeve, which comprises a sleeve assembly and an air injection assembly, wherein the sleeve assembly comprises an air channel, the air channel comprises an air inlet, the air injection assembly comprises an air injection channel, and the air injection channel comprises an air outlet; the gas injection assembly is rotatable within the sleeve assembly to selectively communicate the gas injection passage with the vent passage; the vent channel further comprises a gasket; when the gas injection channel is communicated with the ventilation channel, the gas outlet of the gas injection channel is communicated with the gas inlet of the ventilation channel, and the sealing gasket is positioned between the gas outlet and the gas inlet; when the gas injection channel is not communicated with the ventilation channel, the gas outlet of the gas injection channel is mutually separated from the gas inlet of the ventilation channel, and the sealing gasket is positioned between the outer wall of the gas injection assembly and the gas inlet. According to the invention, the sealing gasket is arranged on the sleeve component or the gas injection component, and when the gas injection channel is not communicated with the ventilation channel, the wall surface of the gas injection component is mutually attached to the sealing gasket so as to seal the ventilation channel, thereby ensuring the tightness of the puncture sleeve and being beneficial to maintaining the stability of pneumoperitoneum.

Description

Puncture sleeve

Technical Field

The invention relates to a surgical instrument, in particular to a puncture cannula, and belongs to the field of medical equipment.

Background

A puncture outfit is a surgical instrument for creating a passageway into the abdominal cavity and comprises a puncture core and a puncture cannula. In a specific operation process, a doctor generally opens a small opening in the abdomen of a patient, and then moves down while aligning the puncture core of the puncture outfit to the small opening for reciprocating rotation, so that one end of the puncture sleeve is driven to enter the abdominal cavity of the patient, after the puncture is completed, the puncture core is pulled out of the puncture sleeve, and the puncture sleeve forms a passage for other surgical instruments to enter and exit. In order to enlarge the space of the abdominal cavity and increase the distance between tissues, thereby being more beneficial to the operation, after the puncture is completed, the gas is injected into the abdominal cavity through a channel formed by the puncture sleeve, therefore, the sleeve assembly is provided with a gas injection assembly, after the gas injection is completed, the gas injection assembly is adjusted to close the gas injection of the sleeve assembly, and the inside of the puncture sleeve is sealed, thereby ensuring the stability of the pneumoperitoneum and facilitating the operation of doctors.

In the existing puncture sleeve, a cock type gas injection valve is generally adopted to inject gas into a sleeve assembly, a gas injection assembly is arranged in the sleeve assembly, and the gas injection assembly is rotated to control the opening and closing of a ventilation channel in the sleeve assembly, so that the hidden danger of gas leakage exists between the gas injection assembly and the sleeve assembly, and the stability of a pneumoperitoneum can be influenced even when the gas injection valve is closed, and the normal operation of a surgery is further influenced.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a puncture cannula, which solves the problems of air leakage of the existing air injection valve and influences the stability of pneumoperitoneum and the normal operation of the operation.

The invention is realized by the following technical scheme: a puncture cannula comprising a cannula assembly and a gas injection assembly, the cannula assembly comprising a vent passageway, the vent passageway comprising a gas inlet, the gas injection assembly comprising a gas injection passageway, the gas injection passageway comprising a gas outlet; the gas injection assembly is at least partially disposed in the sleeve assembly and the gas injection assembly is rotatable in the sleeve assembly to selectively communicate the gas injection passage with the vent passage; the puncture cannula further comprises a sealing gasket;

when the air injection channel is communicated with the ventilation channel, the air outlet of the air injection channel is communicated with the air inlet of the ventilation channel, and the sealing gasket is positioned between the air outlet and the air inlet; when the gas injection channel is not communicated with the ventilation channel, the gas outlet of the gas injection channel is separated from the gas inlet of the ventilation channel, and the sealing gasket is positioned between the outer wall of the gas injection assembly and the gas inlet.

Preferably, the sleeve assembly further comprises a containing piece, wherein the containing piece is arranged at one end of the ventilation channel, and the containing piece is communicated with the ventilation channel; the gas injection assembly is at least partially disposed in the receptacle and the gas injection assembly is rotatable in the receptacle.

Preferably, the gas injection assembly comprises a locking piece, wherein the gas injection channel is arranged in the locking piece, and the gas injection channel is a first gas injection channel; the air outlet is positioned on the wall of the locking piece; the locking member includes a rotator.

Preferably, the gas injection assembly further comprises an operation rod, wherein a second gas injection channel is arranged in the operation rod, and the second gas injection channel is communicated with the first gas injection channel; the gas injection channels include the first gas injection channel and the second gas injection channel.

Preferably, the sleeve assembly comprises a receptacle; the gas injection assembly further comprises an operating rod, and the operating rod and the locking piece are integrally formed or connected; the revolving body is accommodated in the accommodating part, and the air outlet is positioned on the wall of the revolving body.

Preferably, the receiving member comprises a revolution body, or the inner surface of the receiving member comprises a revolution surface.

Preferably, the sealing gasket is arranged on the sleeve assembly or the gas injection assembly.

Preferably, the sealing gasket is arranged at one end of the ventilation channel where the air inlet is located, and the sealing gasket comprises a hole communicated with the air inlet.

Preferably, the sealing gasket is attached to the outer wall of the gas injection assembly.

Preferably, the sealing gasket is arranged on the outer wall of the revolving body, and the sealing gasket comprises a hole communicated with the air outlet.

Preferably, the sleeve assembly at the position of the air inlet is attached to the sealing gasket.

Preferably, the accommodating piece comprises a first accommodating part and a second accommodating part, and the upper end surface of the first accommodating part is provided with a first bulge and a second bulge; the gas injection assembly comprises an operating rod and a locking piece, a notch is formed in the bottom of the operating rod, the notch is alternatively clamped with the first protrusion and the second protrusion, the locking piece comprises a revolving body, and the locking piece is accommodated in the second accommodating portion.

Preferably, a central angle of a fan formed by the first protrusion, the second protrusion and the center of the upper end face is 90 degrees.

Preferably, a third protrusion is further arranged on the upper end surface of the first accommodating part, and the third protrusion and the first protrusion are symmetrically arranged; the central angle of a fan formed by the third bulge, the second bulge and the center of the upper end face is 90 degrees, and the central angle of a fan formed by the first bulge, the second bulge and the center of the upper end face is 90 degrees.

Preferably, the sleeve assembly further comprises a sleeve bin inner shell and a sleeve body, wherein the sleeve body is arranged at the bottom of the sleeve bin inner shell, the ventilation channel is arranged on the wall of the sleeve bin inner shell, and the cavity of the sleeve bin inner shell is communicated with the inner cavity of the sleeve body and the ventilation channel.

Preferably, the puncture cannula further comprises a cannula bin shell, an opening is formed in the cannula bin shell, and the cannula component part protrudes out of the cannula bin shell.

Compared with the prior art, the invention has the beneficial effects that: according to the puncture sleeve, the gas injection assembly is adjusted, so that the gas injection assembly is controlled to be opened and closed, and a gas injection channel in the gas injection assembly is selectively communicated with a ventilation channel in the sleeve assembly. The gas injection assembly adopts a design similar to a ball valve, and a sealing gasket is arranged on the sleeve assembly or the gas injection assembly, when a gas injection channel in the gas injection assembly is not communicated with a ventilation channel, the wall surface of the gas injection assembly is mutually attached to the sealing gasket so as to seal the ventilation channel, the tightness of a puncture sleeve is ensured, the stability of pneumoperitoneum is maintained, and the safe and normal operation is ensured.

Drawings

FIG. 1 is a schematic structural view of a sleeve assembly according to an embodiment of the present invention;

FIG. 2 is a schematic view of the interior of the pod of FIG. 1;

FIG. 3 is a schematic view of a gas injection assembly according to an embodiment of the present invention;

FIG. 4 is a schematic view of an open configuration of an air injection assembly according to an embodiment of the present invention;

FIG. 5 is a partial cross-sectional view of FIG. 4 in the axial direction;

FIG. 6 is a schematic view of a structure of an air injection assembly in a closed state according to an embodiment of the present invention;

FIG. 7 is a partial cross-sectional view of FIG. 6 in the axial direction;

FIG. 8 is a schematic structural view of a cartridge housing according to an embodiment of the present invention;

fig. 9 is a schematic structural view of a puncture cannula according to an embodiment of the present invention.

Reference numerals

10-sleeve assembly, 11-ventilation channel, 12-receiving element, 121-first receiving portion, 122-second receiving portion, 111-gasket, 1211-first projection, 1212-second projection, 13-sleeve cartridge inner housing, 14-sleeve body,

20-gas injection assembly, 21-gas injection channel, 22-gas injection hole, 23-operating rod, 24-locking piece, 241-first pipe fitting, 242-second pipe fitting, 231-notch, 2421-cushion block,

30-casing bin housing, 31-opening.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

Referring to fig. 1, 4 and 6, the present embodiment provides a puncture cannula, including a cannula assembly 10 and an air injection assembly 20, the cannula assembly 10 includes a cannula housing inner shell 13, a cannula body 14, an air channel 11 and a receiving member 12, a sealing device is disposed at an upper portion of the cannula housing inner shell 13, a bottom portion of the cannula housing inner shell 13 is connected with the cannula body 14, and structures and connection relationships of the sealing device, the cannula housing inner shell 13 and the cannula body 14 are all in the prior art, so they will not be described in detail herein. The ventilation channel 11 is a hollow tube. One end (i.e., a first end) of the vent passage 11 is connected to the cartridge inner housing 13, and the vent passage 11 communicates with the cartridge body 14 through the cartridge inner housing 13. The receiving piece 12 is provided at the other end of the ventilation channel 11 and communicates with the ventilation channel 11. The ventilation channel 11 extends transversely, the accommodating part 12 extends longitudinally, and the ventilation channel 11 is perpendicular to the accommodating part 12. The "longitudinal direction" in the present embodiment refers to a direction parallel to the axial direction of the sleeve body 14, and the "transverse direction" refers to a direction perpendicular to the longitudinal direction. The interior of the accommodating part 12 is used for accommodating a part of the gas injection assembly 20, the other end (i.e., the second end) of the ventilation channel 11 is a gas inlet, and the gas inlet is provided with a sealing pad 111, as shown in fig. 2, the sealing pad 111 is in a circular ring shape, and the center axis of the sealing pad 111 coincides with the center axis of the ventilation channel 11. The center of the gasket 111 is provided with a center hole, the diameter of which is greater than or equal to the diameter of the air inlet, and the gasket 111 is attached to the outer wall of the air injection assembly 20. With continued reference to fig. 1, the accommodating element 12 includes a first accommodating portion 121 and a second accommodating portion 122, the first accommodating portion 121 is in a straight tube shape, the second accommodating portion 122 is in a spherical shape, and the first accommodating portion 121 and the second accommodating portion 122 are aligned in an axial direction. Alternatively, the inner surface of the second accommodating portion 122 is a rotation surface. The sleeve body 14, the sleeve bin inner shell 13 and the ventilation channel 11 are communicated in sequence. The upper end surface of the first accommodating portion 121 is provided with a structure that cooperates with the gas injection assembly 20, and the structure is a first protrusion 1211 and a second protrusion 1212, which are used to define the position of the gas injection assembly 20 relative to the sleeve assembly 10, and facilitate the switching of the gas injection assembly 20 between the open and closed states. The central angle of the fan shape formed by the first protrusion 1211, the second protrusion 1212 and the center of the upper end surface (i.e. the pipeline opening) of the first accommodating portion 121 is 90 degrees, so that the gas injection assembly 20 is guaranteed to be in a completely opened or completely closed state in two states, and on the other hand, the stroke required by the gas injection assembly 20 in the state of conversion is reduced, and the operation is facilitated. The first accommodating portion 121 and the second accommodating portion 122 are integrally formed.

Referring to fig. 2, 4 and 6, the gas injection assembly 20 includes an operation lever 23 and a locking member 24, the operation lever 23 and the locking member 24 are disposed at an angle of 30 to 150 °, and a gas injection passage 21 is formed in the gas injection assembly 20. Preferably, the operating rod 23 and the locking piece 24 are vertically arranged, the locking piece 24 extends longitudinally, the operating rod 23 extends transversely, and the operating rod 23 can be rotated in the operation process. Preferably, the operation rod 23 and the locking member 24 are connected or integrally formed to avoid air leakage of the air injection passage 21 at the connection of the operation rod 23 and the locking member 24. The bottom of the operating rod 23 is provided with a notch 231 for alternatively engaging with the first protrusion 1211 and the second protrusion 1212 on the accommodating element 12 to define the gas injection assembly 20 in an open or closed state. After the notch 231 on the operating rod 23 is engaged with the second protrusion 1212, the gas injection assembly 20 is in an open state, as shown in fig. 4 and 5; after the notch 231 on the operating rod 23 is engaged with the first protrusion 1211, the gas injection assembly 20 is in a closed state, as shown in fig. 6 and 7. Thereby achieving selective communication of the gas injection passage 21 with the ventilation passage 11. When the operation rod 23 rotates, the notch 231 at the bottom of the operation rod is mutually extruded with the first protrusion 1211 or the second protrusion 1212 on the sleeve assembly 10, so that the first protrusion 1211 or the second protrusion 1212 enters the notch 231, and the first protrusion 1211 or the second protrusion 1212 is positioned after being clamped with the notch 231, so that the shaking of the gas injection assembly 20 relative to the accommodating part 12 is avoided. The surfaces of the notch 231 and the first protrusion 1211, and the surfaces of the notch 231 and the second protrusion 1212 that are in contact with each other are provided with chamfers to facilitate the entry of the first protrusion 1211 or the second protrusion 1212 into the notch 231 and the disengagement from the notch 231.

The locking member 24 comprises a first tube 241 and a second tube 242, the first tube 241 being a straight tube and the second tube 242 being a solid of revolution, preferably a sphere. The operating rod 23, the first pipe 241 and the second pipe 242 are sequentially communicated to form the gas injection channel 21, and the wall of the second pipe 242 is provided with a through hole to form the gas injection hole 22, preferably, the central axis of the gas injection hole 22 is parallel to the extending direction of the operating rod 23.

In another embodiment (not shown), the gasket 111 is partially or completely disposed around the outer wall of the second tube 242, and the gasket 111 is provided with a hole to communicate with the gas injection hole 22. The end of the vent passage 11 is arc-shaped to fit the shape of the outer wall of the second tube 242 to which the gasket 111 is attached, so that the end of the vent passage 11 fits the gasket 111. Thus, when the gas injection assembly is opened, the gasket 111 causes the gas injection hole 22 to form a gas-tight connection with the ventilation channel 11; the gasket 111 seals between the vent passage 11 and the outer wall of the second tube 242 when the gas injection assembly is closed, preventing the vent passage 11 from leaking gas.

In the gas injection assembly 20 formed by machining, one end of the operating rod 23 forms a gas inlet of the gas injection channel 21, and the gas injection hole 22 formed in the wall of the second pipe 242 serves as a gas outlet of the gas injection channel 21. The bottom end of the second tube 242 needs to have an opening for the manufacturing process. In order to further ensure the sealing effect between the second pipe fitting 242 and the second accommodating portion 122, the opening at the bottom end of the second pipe fitting 242 is sealed by a cushion block 2421, and the cushion block 2421 is in interference fit with the second pipe fitting 242 to seal the opening, so that the gas entering the locking piece 24 from the operating rod 23 can only be output through the gas injection hole 22 on the second pipe fitting 242, thereby improving the gas injection efficiency when the gas injection assembly is opened and enhancing the sealing property when the gas injection assembly is closed.

In fig. 5 and 7, the entirety of the gas injection assembly 20 is cut away, the right half of the housing 12 is cut away, and the gasket 111 is cut away. The second pipe 242 of the gas injection assembly 20 is disposed in the second accommodating portion 122 of the sleeve assembly 10 and is in clearance fit with the second accommodating portion 122, and the first pipe 241 of the gas injection assembly 20 is at least partially disposed in the first accommodating portion 121 and is also in clearance fit with the first accommodating portion 121. The outer diameter of the second tube 242 is larger than the inner diameter of the first accommodating portion 121, and the outer wall of the second tube 242 is wrapped by the inner wall of the second accommodating portion 122, so as to avoid the gas injection assembly 20 from generating axial movement relative to the accommodating piece 12, which is larger than the gap between the second tube 242 and the second accommodating portion 122. The second pipe 242 and part of the first pipe 241 can rotate in the accommodating element 12 comprising the second accommodating part 122 and the first accommodating part 121, and the second pipe 242 cannot be separated from the second accommodating part 122 in the rotating process. In a specific process, the half shell of the first accommodating portion 121 and the half shell of the second accommodating portion 122 axially connected thereto are integrally formed to form a first enclosing portion, the other half shell of the first accommodating portion 121 and the other half shell of the second accommodating portion 122 are integrally formed to form a second enclosing portion, the second pipe 242 and part of the first pipe 241 are first placed in the first enclosing portion, and then the second enclosing portion is combined on the first enclosing portion, so that the first enclosing portion and the second enclosing portion form the accommodating cavity of the accommodating member 12. The first enclosure and the second enclosure may be joined by welding, bonding, or the like. After the puncture device completes puncture, the puncture core is pulled out of the puncture sleeve, and air is injected into the abdominal cavity of the patient. As shown in fig. 4 and 5, when the extending direction of the operation rod 23 and the extending direction of the ventilation channel 11 are parallel to each other, the gas injection assembly 20 is in a completely opened state, the notch 231 on the operation rod 23 is engaged with the second protrusion 1212, the gas injection hole 22 on the second pipe 242 faces the ventilation channel 11, the gas injection channel 21 in the gas injection assembly 20 is communicated with the ventilation channel 11, and in this state, the gas injection speed is the fastest. The edge of the gas injection hole 22 is attached to the sealing pad 111 disposed at the gas inlet of the ventilation channel 11, so that gas cannot overflow from the gap formed between the second pipe 242 and the second accommodating portion 122 during gas injection, and gas injection efficiency is improved.

Through the gas inlet of the operation rod 23, the gas is introduced into the ventilation channel 11 of the cannula assembly 10 along with the gas injection channel 21 in the gas injection assembly 20 through the gas injection holes 22, and then into the abdominal cavity through the cannula cartridge inner housing 13, the cannula body 14.

After the gas injection is completed, the operation rod 23 is rotated clockwise, and after the operation rod is rotated 90 degrees, as shown in fig. 6 and 7, the gas injection assembly 20 is in a closed state, the notch 231 on the operation rod 23 is clamped with the first protrusion 1211, the gas injection hole 22 on the second pipe fitting 242 is completely deviated from the pipe mouth of the gas channel 11 and does not coincide with the pipe mouth of the gas channel 11, the outer shell of the second pipe fitting 242 is tightly attached to the sealing pad 111 arranged at the gas inlet of the gas channel 11, namely, the second end of the gas channel 11 is tightly closed by the outer shell of the second pipe fitting 242, so that the gas injection channel 21 in the gas injection assembly 20 is not communicated with the sleeve assembly 10, and gas in the gas channel 11 cannot overflow from the gap between the second pipe fitting 242 and the second accommodating part 122 due to the tight attachment of the sealing pad 111 and the outer shell of the second pipe fitting 242. Under the action of the sealing devices on the gas injection assembly 20 and the inner casing 13 of the cannula bin, the whole cannula assembly 10 is in a sealing state, so that the stability of pneumoperitoneum in the operation process is effectively ensured, and the safe and smooth operation is facilitated. It is to be understood that there may be two first protrusions 1211 distributed on both sides of the second protrusion 1212, and the two first protrusions 1211 are mirror images disposed on the upper end surface of the first accommodating portion 121, so that the doctor can selectively rotate the operating rod 23 clockwise or counterclockwise to close the insufflation assembly according to the surrounding environment of the puncture outfit during the operation.

The puncture cannula of the present invention further comprises a cannula cartridge housing 30, and referring to fig. 8 and 9, an opening 31 is provided in the cannula cartridge housing 30, a cannula cartridge inner housing 13 is provided in the cannula cartridge housing 30, and a ventilation passage 11 connected to the cannula cartridge inner housing 13 is provided to protrude from the cannula cartridge housing 30 through the opening 31.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. A puncture cannula comprising a cannula assembly and a gas injection assembly, said cannula assembly comprising a vent passageway, said vent passageway comprising a gas inlet, characterized in that said gas injection assembly comprises a gas injection passageway, said gas injection passageway comprising a gas outlet; the gas injection assembly is at least partially disposed in the sleeve assembly and the gas injection assembly is rotatable in the sleeve assembly to selectively communicate the gas injection passage with the vent passage; the penetration cannula further includes a seal, the seal including an aperture;

when the air injection channel is communicated with the ventilation channel, the air outlet of the air injection channel is communicated with the air inlet of the ventilation channel, the sealing gasket is positioned between the air outlet and the air inlet, the hole and the air outlet are sequentially communicated; when the gas injection channel is not communicated with the ventilation channel, the gas outlet of the gas injection channel is separated from the gas inlet of the ventilation channel, and the sealing gasket is positioned between the outer wall of the gas injection assembly and the gas inlet;

the sleeve assembly further comprises a containing piece, wherein the containing piece is arranged at one end of the ventilation channel and is communicated with the ventilation channel; the gas injection assembly is at least partially arranged in the accommodating part and can rotate in the accommodating part;

the gas injection assembly comprises a locking piece, wherein the gas injection channel is arranged in the locking piece and is a first gas injection channel; the air outlet is positioned on the wall of the locking piece; the locking piece comprises a revolving body; the revolving body is a spherical member; the inner surface of the accommodating part comprises a revolving surface, and the revolving surface wraps the revolving body.

2. The puncture cannula of claim 1, wherein the insufflation assembly further comprises a lever having a second insufflation channel disposed therein, the second insufflation channel in communication with the first insufflation channel; the gas injection channels include the first gas injection channel and the second gas injection channel.

3. The penetration cannula of claim 1, wherein the cannula assembly comprises a receptacle; the gas injection assembly further comprises an operating rod, and the operating rod and the locking piece are integrally formed or connected; the revolving body is accommodated in the accommodating part, and the air outlet is positioned on the wall of the revolving body.

4. The puncture cannula of claim 1, wherein the seal is disposed on the cannula assembly or the insufflation assembly.

5. The puncture cannula according to claim 1, wherein the sealing pad is disposed at one end of the vent channel where the air inlet is located, the aperture of the sealing pad being in communication with the air inlet.

6. The puncture cannula of claim 5, wherein the seal conforms to an outer wall of the gas injection assembly.

7. The puncture cannula according to claim 1, wherein the gasket is provided on an outer wall of the rotator, and the hole of the gasket communicates with the air outlet.

8. The puncture cannula according to claim 7, wherein the cannula assembly at the location of the air inlet is in engagement with the sealing pad.

9. The puncture cannula according to claim 1, wherein the accommodating member comprises a first accommodating portion and a second accommodating portion, and an upper end surface of the first accommodating portion is provided with a first protrusion and a second protrusion; the gas injection assembly comprises an operating rod and a locking piece, a notch is formed in the bottom of the operating rod, the notch is alternatively clamped with the first protrusion and the second protrusion, the locking piece comprises a revolving body, and the locking piece is accommodated in the second accommodating portion.

10. The cannula according to claim 9, wherein a central angle of a sector formed by the first protrusion, the second protrusion and a center of the upper end face is 90 °.

11. The puncture cannula according to claim 9, wherein an upper end surface of the first accommodation portion is further provided with a third protrusion, and the third protrusion is symmetrically arranged with the first protrusion; the central angle of a fan formed by the third bulge, the second bulge and the center of the upper end face is 90 degrees, and the central angle of a fan formed by the first bulge, the second bulge and the center of the upper end face is 90 degrees.

12. The penetration cannula of claim 1, wherein the cannula assembly further comprises a cannula cartridge inner housing and a cannula body disposed at a bottom of the cannula cartridge inner housing, the vent passage being located in a wall of the cannula cartridge inner housing, a cavity of the cannula cartridge inner housing being in communication with the lumen of the cannula body and the vent passage.

13. The penetration cannula of claim 1, further comprising a cannula cartridge housing having an opening therein, the cannula assembly portion protruding from the cannula cartridge housing.