CN113456181A

CN113456181A - Casing puncture outfit

Info

Publication number: CN113456181A
Application number: CN202010247258.7A
Authority: CN
Inventors: 虞杰伟
Original assignee: Ningbo Xinwell Medical Technology Co Ltd
Current assignee: Ningbo Xinwell Medical Technology Co Ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2021-10-01
Anticipated expiration: 2040-03-31
Also published as: CN113456181B

Abstract

A cannula puncture instrument includes a cannula assembly and a puncture needle assembly. The sleeve assembly includes a sleeve body, a support bracket, a seal, and a fluid control valve. The support frame has a projection provided along an insertion or extraction direction of the insertion tool. The seal has a recess corresponding to the projection. The convex part is inserted into the concave cavity of the concave part, and at least one side cavity wall of the concave cavity has a gap with the convex part, so that the concave part can move relative to the convex part to adjust the position, and when the insertion tool is inserted and pulled out, the concave part of the sealing element can generate relative displacement with the convex part under the action force of the insertion tool, and the deformation of the insertion tool which is more attached is generated. The sleeve main body is also provided with a first fluid channel communicated with the insertion cavity and used for fluid to enter and exit the insertion cavity, and the fluid control valve is connected with the first fluid channel and used for injecting gas into the abdominal cavity, leading the gas in the abdominal cavity out of the body or flushing the abdominal cavity in operation.

Description

Casing puncture outfit

Technical Field

The application relates to the field of medical equipment, in particular to a casing puncture outfit.

Background

In a minimally invasive medical operation of a human body, once a lesion is found in the human body, an operation or excision is required. In the operation process, firstly, a puncture outfit is needed to be applied, the puncture outfit is a surgical instrument which punctures the abdominal wall and provides a passage for other surgical instruments to enter the body cavity, and the puncture outfit belongs to a minimally invasive surgical instrument. The penetrator generally includes a cannula assembly for passage of other surgical instruments and a needle assembly extending therethrough. In operation, first, in order to penetrate the skin, the skin epidermis is incised with a surgical knife, and then the puncture needle assembly is used to penetrate the skin and enter the body cavity together with the cannula body. The needle assembly is then withdrawn and the cannula assembly serves as a passage for introducing various instruments and tools into the abdominal cavity and for providing insufflation to elevate the abdominal wall above the organs.

However, the prior puncture outfit structure has many problems, such as poor sealing effect, and further improvement is needed.

Disclosure of Invention

The application provides a novel sleeve puncture ware.

The present application provides in one embodiment a cannula puncture device comprising:

the sleeve assembly comprises a sleeve main body, a supporting frame, a sealing piece and a fluid control valve, wherein the sleeve main body is provided with a through insertion cavity and a first fluid channel communicated with the insertion cavity, the insertion cavity is used for an insertion tool to pass through, and the first fluid channel is used for fluid to enter and exit the insertion cavity; the support frame is arranged on the sleeve main body and is provided with at least one protruding part protruding along the inserting or extracting direction of the inserting tool; the sealing element is arranged on the sleeve main body in a sealing mode and transversely arranged on the insertion path of the insertion tool, the sealing element is provided with a sealing opening for the insertion tool to pass through in a sealing mode, the sealing element is provided with a concave part corresponding to the convex part, the convex part is inserted into a concave cavity of the concave part, and at least one side cavity wall of the concave cavity is provided with a gap with the convex part so as to enable the sealing element to deform correspondingly when the insertion tool is inserted and pulled out; the fluid control valve is connected with the first fluid channel and used for controlling the opening and closing of the first fluid channel;

and the puncture needle assembly comprises a rod seat and a needle rod, the needle rod is fixedly connected with the rod seat, the needle rod is detachably inserted into the insertion cavity, and the rod seat is arranged on the cannula assembly.

In one embodiment, the first fluid channel has a first end and a second end disposed opposite to each other, the second end of the first fluid channel being in communication with the insertion cavity; the fluid control valve includes a valve seat having a second fluid passage and a valve element installed in the second fluid passage to shut off and open the second fluid passage; the valve seat is fixedly connected with the sleeve main body, the valve seat is provided with a first end and a second end which are arranged oppositely, the second fluid channel penetrates through the first end and the second end of the valve seat, the end face of the second end of the valve seat is arranged oppositely to the end face of the first end of the first fluid channel and is in sealing butt joint, and the second end of the valve seat is communicated with the first end of the first fluid channel.

In one embodiment, the shank has a shank cavity which is open at its upper end and which has closed lateral cavity walls, and the shank base has a shank base through-hole which communicates with the opening of the shank for insertion of an auxiliary tool into the shank cavity.

In one embodiment, the concave part is arranged around the sealing opening, the convex part corresponds to the concave part, the cavity wall of the concave part between the sealing opening and the convex part is an inner cavity wall, the other side cavity wall opposite to the inner cavity wall is an outer cavity wall, and at least one of the inner cavity wall and the outer cavity wall has a gap with the convex part.

In one embodiment, the depressed parts are distributed in a ring shape, and the sealing ports are positioned in the area enclosed by the inner rings of the depressed parts; the convex parts are distributed annularly.

In one embodiment, the device further comprises a valve member for controlling the one-way insertion of an insertion tool, wherein the valve member is arranged in the insertion cavity, and the insertion tool can be inserted into and penetrate through the inlet end of the valve member; the convex part is convexly arranged along the pulling-out direction of the inserting tool, the concave part is concavely arranged along the pulling-out direction of the inserting tool, and the convex part and the sealing piece are positioned on one side of the inlet end of the valve piece.

In one embodiment, the sealing member is positioned above the inlet end of the valve member, wherein:

the sealing port of the sealing element is not lower than the uppermost end of the valve element, or,

the sealing port of the sealing element is positioned in the valve element, and the distance a from the sealing port of the sealing element to the outlet end of the valve element takes the value as follows: a is more than or equal to 5mm and less than or equal to 50 mm.

In one embodiment, the range of values of the gap b between the cavity wall of the concave cavity and the convex part is as follows: b is more than or equal to 0.5mm and less than or equal to 10 mm.

In one embodiment, the casing main body includes an upper seat body and a lower seat body, the insertion cavity is penetratingly disposed on the upper seat body and the lower seat body, the supporting frame and the sealing member are disposed between the upper seat body and the lower seat body, the sealing member has a pressing portion, the pressing portion is located on one side of the recessed portion away from the sealing opening, and the pressing portions of the supporting frame and the sealing member are clamped and fixed by the upper seat body and the lower seat body.

In one embodiment, the pressing portion has a concave shape with a concave direction opposite to the concave direction; the cross section of the concave part is U-shaped, V-shaped, circular arc or square.

In one embodiment, a sealing ring is arranged between the second end face of the valve seat and the first end face of the first fluid channel for sealing.

In one embodiment, the first end surface of the first fluid channel and the second end surface of the valve seat are flat, inclined or uneven surfaces.

In one embodiment, the sleeve main body is provided with a clamping portion, the clamping portion is located on the outer side of the first end face of the first fluid channel, a valve installation cavity is formed between the clamping portion and the first end face of the first fluid channel, the second end of the fluid control valve is installed in the valve installation cavity, and the clamping portion is fixed to the valve seat in a clamped mode.

In one embodiment, the sleeve main body is provided with a notch, the clamping portion is at least one and is arranged at the notch, the valve installation cavity and the notch are both provided with openings above, the valve seat is installed in the notch, and the clamping portion is fixed with the valve seat in a clamping mode from two opposite directions.

In one embodiment, a portion of the valve seat corresponding to the second end of the second fluid passage is a boss structure, and a bottom wall of the gap is higher than a bottom wall of the valve mounting cavity so as to define the second end of the valve seat in the valve mounting cavity in the axial direction of the second fluid passage.

In one embodiment, the sleeve body has an inner ring, an outer ring and a tube body, the inner ring is communicated with the tube body and forms an insertion cavity, the outer ring is sleeved outside the inner ring, the first fluid channel penetrates through the inner ring, the gap is arranged on the outer ring, and the valve installation cavity is located in an area between the inner ring and the outer ring; the valve seat is provided with a positioning plate, the positioning plate is provided with a positioning bulge, and the clamping part is fixedly clamped with the positioning bulge.

In one embodiment, the outer peripheral surface of the side cavity wall is provided with a plurality of grooves arranged along the axial direction of the rod cavity.

In one embodiment, the recess extends to the tip of the needle shaft.

In one embodiment, the depth A1 of the groove is more than 0 and less than or equal to A1 and less than or equal to 0.5 mm.

In one embodiment, the needle head of the needle rod is provided with a convex cutting edge, and the joint of the cutting edge and the outer wall of the needle head is in a round angle shape.

In one embodiment, the needle bar is made of plastic or metal material; the needle bar is of an integrally formed structure.

A trocar according to the above-described embodiments includes a cannula assembly and a trocar assembly. The sleeve assembly includes a sleeve body, a support bracket, a seal, and a fluid control valve. The support frame is mounted on the casing main body and is provided with at least one protruding part protruding along the inserting or extracting direction of the inserting tool. The sealing element is fixedly arranged on the supporting frame and is provided with a concave part corresponding to the convex part. The convex part is inserted into the concave cavity of the concave part, and at least one side cavity wall of the concave cavity has a gap with the convex part, so that the concave part can move relative to the convex part to adjust the position, and when the insertion tool is inserted and pulled out, the concave part of the sealing element can generate relative displacement with the convex part under the action force of the insertion tool, and the deformation of the insertion tool which is more attached is generated. The sleeve main body is also provided with a first fluid channel communicated with the insertion cavity and used for fluid to enter and exit the insertion cavity, and a fluid control valve is connected with the first fluid channel and used for controlling the opening and closing of the first fluid channel and used for injecting gas into the abdominal cavity, leading the gas in the abdominal cavity out of the body or flushing the abdominal cavity during operation.

Drawings

FIG. 1 is a schematic structural diagram illustrating an appearance of a trocar according to an embodiment of the present application;

FIGS. 2 and 3 are exploded views of a trocar in accordance with one embodiment of the present application;

FIG. 4 is a cross-sectional view of a seal arrangement of a ferrule assembly according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a seal according to an embodiment of the present disclosure;

FIG. 6 is a cross-sectional view of a seal in an embodiment of the present application;

FIG. 7 is a cross-sectional view of the sealing member, the supporting frame and the upper base according to an embodiment of the present disclosure;

FIG. 8 is a side view of a seal in another embodiment of the present application;

FIG. 9 is a cross-sectional view of the seal of FIG. 8;

FIG. 10 is a cross-sectional view of the seal shown in FIG. 8 mounted to a support bracket and upper housing;

FIGS. 11-13 are cross-sectional views of seals in several other embodiments of the present application;

FIG. 14 is an exploded view of the sleeve body (only the lower housing shown) and the fluid control valve according to one embodiment of the present disclosure;

FIG. 15 is a cross-sectional view of a sleeve body and a fluid control valve according to an embodiment of the present application;

FIG. 16 is a schematic illustration of a fluid control valve according to an embodiment of the present application;

FIG. 17 is a schematic view of the outer configuration of an introducer needle assembly of one embodiment of the present application;

FIG. 18 is an exploded view of an introducer needle assembly of one embodiment of the present application;

FIG. 19 is a cross-sectional view of an exploded view of an introducer needle assembly as is used in one embodiment of the present application;

FIG. 20 is an exploded view of an alternate embodiment of the lancet assembly of the present application;

FIG. 21 is a side elevational view of a needle shaft portion of another embodiment of the present application;

fig. 22 is a sectional view taken along B-B in fig. 21.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

The present embodiments provide a cannula puncturing device, such as a 5mm format cannula puncturing device, including a cannula assembly and a needle assembly removably insertable into an insertion cavity of the cannula assembly. In the puncture, the skin epidermis is cut with the surgical knife and then the puncture needle assembly is used to penetrate the skin and enter the body cavity together with the cannula body. The needle assembly is then withdrawn and the insertion lumen of the cannula assembly serves as a passage for introducing various instruments and tools into the abdominal cavity and for providing insufflation to elevate the abdominal wall above the organ.

Referring to fig. 1, in one embodiment, the cannula puncture instrument includes a needle assembly 100 and a cannula assembly 200. The needle assembly 100 has a hub 110 and a needle 120 coupled to the hub 110, the needle 120 being inserted into the cannula assembly 200.

Referring to fig. 2 to 7, in one embodiment, the cannula assembly 200 includes a cannula body 210, a valve element 220 for controlling the insertion of an insertion tool, a support bracket 230, and a sealing element 240. Of course, the cannula assembly 200 may include other components and structures as well, which are well known in the art.

Referring to fig. 4, the cannula body 210 has an insertion cavity 201 therethrough, the insertion cavity 201 being adapted for passage of an insertion tool therethrough. The cannula body 210 has an elongated body 2111 for insertion into a patient. The insertion tool can be passed through the tube 2111. The insertion tool includes not only the lancet assembly 100, but also various instruments and tools that are required to insert the cannula assembly 200 during a surgical procedure.

The valve member 220 is mounted in the insertion chamber 201 and an insertion tool can be inserted through the valve member 220 from the inlet end of the valve member 220. The purpose of the valve element 220 is to form a one-way communication structure from the inlet end to the outlet end. Typically, the valve member 220 is a duckbill valve, as shown in figures 2 to 4. However, in other embodiments, other valve structures may be used in place of the duckbill valve, as shown for the valve element 220 of the present embodiment.

Referring to fig. 4 to 7, the supporting bracket 230 is mounted on the casing main body 210 and has at least one protruding portion 231 protruding along the insertion or extraction direction of the insertion tool. The seal 240 is sealingly mounted to the cannula body 210 and is positioned transversely across the insertion path of the insertion tool. Seal 240 has a seal opening 241 for sealing with an insertion tool therethrough, and seal opening 241 may be disposed in a seal body 243. Thus, the insertion chamber 201 communicates with the outside through the sealing port 241 of the sealing member 240. The size of the sealing opening 241 typically ranges from 0.5mm to 5mm (both inclusive), but the sealing opening 241 may be provided in other sizes depending on the insertion tool.

The sealing member 240 is fixedly mounted on the supporting frame 230, and the two members may be connected in a sealing manner or in a non-sealing manner. When the sealing member 240 is not sealingly connected to the support frame 230, other sealing structures may be provided on the sealing member 240 to seal off the insertion cavity 201. The sealing member 240 has a recess 242 corresponding to the projection 231. The sealing member 240 and the supporting frame 230 can be fixed by detachable fixing and non-detachable fixing. The protruding portion 231 is inserted into the recessed cavity of the recessed portion 242, and at least one side of the recessed cavity has a gap with the protruding portion 231, so as to generate corresponding deformation of the sealing member 240 when the insertion tool is inserted and pulled out.

Referring to fig. 6, since at least one side of the cavity wall of the cavity has a gap with the protrusion 231 (as shown in the figure, the cavity walls on both sides of the cavity have a gap with the protrusion 231), when the insertion tool is inserted and pulled out, the cavity wall 242 of the sealing member 240 can generate relative displacement with the protrusion 231 under the action of the insertion tool, so as to generate deformation more fitting to the insertion tool, which not only can ensure the sealing effect between the sealing opening 241 and the insertion tool, but also can avoid the problem of tearing of the sealing member 240 due to the hard opposition of the action force between the sealing member 240 and the insertion tool.

Specifically, the size of the sealing opening 241 is generally smaller than the outer diameter of the insertion tool, so that when the insertion tool is inserted into the sealing opening 241, the opening wall of the sealing opening 241 is caused to deform and thereby abut against the insertion tool, thereby completing the seal. Since the opening wall of the sealing opening 241 is tightly attached to the insertion tool, when the insertion tool moves in the insertion direction (from top to bottom in fig. 7), the peripheral portion of the sealing opening 241 is driven to deform downward, and the sealing member 240 is easily torn. In this embodiment, when the insertion tool pulls the seal 240, the gap between the seal 240 and the protrusion 231 allows the protrusion to move relative to the recess (e.g., move radially along the seal 240) to adjust the position. The gap provides a certain buffer deformation capability for the sealing element 240, and the movement of the insertion tool can be adapted by adjusting the gap variation, so as to avoid the tearing of the sealing element 240 and prevent the sealing element 240 from turning in the insertion direction under the driving of the insertion tool. Moreover, the gap also enables the sealing opening 241 to adapt to the shapes and sizes of different insertion tools through position deformation when being matched with the insertion tools, so that the fitting effect is improved, and the sealing performance is improved.

In addition, in a clinical operation, after the insertion tool is inserted into the sealing member 240, the insertion tool may tilt or shake, at this time, a gap between the sealing member 240 and the protrusion 231 may serve as a buffer structure, and the size of the gap between the sealing member 240 and the protrusion 231 is automatically adjusted, so that the insertion tool and the sealing member 240 are always kept in close contact with each other, and the sealing performance is not affected by the tilting or shaking of the insertion tool.

Referring to fig. 6, a cavity wall of the concave portion 242 located between the sealing opening 241 and the convex portion 231 is an inner cavity wall, another cavity wall opposite to the inner cavity wall is an outer cavity wall, and at least one of the inner cavity wall and the outer cavity wall has a gap with the convex portion 231.

Referring to fig. 2, 5 and 6, in one embodiment, the concave portion 242 is disposed around the sealing opening 241, and the convex portion 231 is disposed corresponding to the concave portion 242 and also disposed around the sealing opening 241. The support frame 230 is hollow in the middle, so that the insertion and extraction of a tool can be facilitated. Of course, in some embodiments, the support frame 230 may not be a unitary structure, but rather may be formed of a plurality of separate components that surround the sealing opening 241 and are disposed at different locations.

Referring to fig. 2, 3 and 5, in one embodiment, the recessed portion 242 is distributed in a ring shape, and the sealing opening 241 is located on a sealing body 243 surrounded by an inner ring of the recessed portion 242. Correspondingly, the protrusions 231 are also distributed in a circle.

Referring to fig. 7, in an embodiment, the protruding portion 231 protrudes along the insertion tool extraction direction (from bottom to top in fig. 7), and the recessed portion 242 is recessed towards the insertion tool extraction direction. This design is mainly used to avoid the seal 240 from turning downward when the insertion tool is inserted, and to ensure that the seal 240 can deform to fit the insertion tool according to the shape and size of the insertion tool. The recess 242 is not fixed above, so that when the insertion tool is pulled out, it can still deform upward to avoid the seal 240 being torn by the insertion tool.

Of course, some limiting structure may be provided on the other side of the concave portion 242 (the side opposite to the side where the convex portion 231 is located) to prevent the sealing member 240 from moving too far toward the side, so as to avoid the sealing member 240 from failing. For example, referring to FIG. 7, the upper housing 212, as will be described below, has an upper retention post 2121 that is positioned a distance above the seal 240, such as a distance above the sealing body 243, to prevent the seal 240 from moving upward too far.

In one embodiment, the value of the gap b between the cavity wall of the concave cavity and the convex part 231 is preferably in a range of: b is more than or equal to 0.5mm and less than or equal to 10 mm. This improves the sealing effect of the sealing member 240 against the insertion tool and ensures the safety of the sealing member 240.

Further, referring to fig. 4, in an embodiment, the protrusion 231 and the sealing member 240 are located at one side of the inlet end of the valve element 220. The insertion tool passes through the seal 240 and then through the valve member 220. Of course, in some embodiments, the sealing member 240 may be disposed below the valve member 220 (i.e., on the side of the outlet end of the valve member 220).

In some prior art sealing structures, the seal 240 extends too far into the valve member 220, and thus, when the insertion tool is inserted, the seal 240 is easily attached to the inner cavity wall of the valve member 220, thereby causing the seal to fail. With continued reference to fig. 4, in one embodiment, the sealing member 240 is located above the inlet end of the valve element 220, and the sealing opening 241 of the sealing member 240 is not lower than the uppermost end of the valve element 220. Thus, even if the sealing member 240 is deformed downward when the insertion tool is inserted, it is difficult to adhere to the inner cavity wall of the valve member 220, and thus this can be prevented.

Of course, in some embodiments, the sealing opening 241 of the sealing element 240 may also be located in the valve element 220, and the distance a from the sealing opening 241 of the sealing element 240 to the outlet end of the valve element 220 is: a is more than or equal to 5mm and less than or equal to 50 mm.

Further, referring to fig. 2, 3 and 4, in an embodiment, the sleeve main body 210 may include a lower seat 211 and an upper seat 212. The insertion cavity 201 is penetratingly disposed on the upper and

lower seat bodies

212 and 211. The upper seat 212 and the lower seat 211 may each have a cavity that communicates to form the insertion cavity 201. The support bracket 230 and the sealing member 240 are disposed between the upper housing 212 and the lower housing 211. The lower housing 211 is insertedly mounted to the upper housing 212 via mounting posts 2111, and thus assembled as a unit. In other embodiments, the sleeve body 210 may be an integrally formed structure, or may be formed by splicing and combining more components.

The sealing member 240 has a pressing portion 244, the pressing portion 244 is located on a side of the recessed portion 242 away from the sealing opening 241, and the supporting frame 230 and the pressing portion 244 of the sealing member 240 are clamped and fixed by the upper seat body 212 and the lower seat body 211. As shown in fig. 6 and 7, the pressing portion 244 may have a concave shape, and the concave direction is opposite to that of the concave portion 242. The upper housing 212 has an upper pressing piece 2122, and the upper pressing piece 2122 is pressed from above into a recessed area of the pressing portion 244, so that the sealing member 240 is fixed together by the supporting frame 230. The upper pressing block 2122 may be a ring-shaped protrusion, or may have another shape. Of course, the pressing portion 244 may have other shapes, such as a flat surface, as long as it can be clamped by the upper seat 212 and the supporting frame 230. The supporting frame 230 is mounted on the valve element 220, and the lower seat 211 abuts against the valve element 220 to clamp the supporting frame 230 and the valve element 220 together with the upper seat 212.

Specifically, the valve element 220 is installed in the cavity of the lower seat body 211, the supporting frame 230 presses down around the valve element 220, the sealing element 240 is located above the supporting frame 230, the upper seat body 212 presses the pressing portion 244 of the sealing element 240 down on the supporting frame 230, and the supporting frame 230 presses the valve element 220 on the lower seat body 211.

Further, referring to fig. 6, the inner ring area of the sealing element 240 is a sealing body 243 with a substantially plane shape, and a sealing opening 241 is opened in the sealing body 243. Referring to fig. 8 to 10, in one embodiment, the sealing body 243 is substantially conical, and the sealing opening 241 is disposed at the bottom of the conical shape. The conical inner collar region is capable of guiding an insertion tool through the sealing port 241 to facilitate insertion of the insertion tool.

Referring to fig. 6, in an embodiment, the cross-sectional shape of the concave portion 242 is U-shaped, and the bottom of the concave cavity of the U-shaped concave portion 242 has a smooth transition, so as to facilitate the movement of the concave portion 242 relative to the convex portion 231. Of course, in other embodiments, the recessed portion 242 can have other shapes, such as a V-shape (as shown in fig. 11 and 12), a circular arc shape, a square shape, or the like. Correspondingly, the protrusion 231 may also have a shape matching the recess 242, and may also be U-shaped, V-shaped, circular arc-shaped, square-shaped, or the like.

In addition, referring to fig. 6, 9, and 11 to 13, there may be more than one recess 242, and when there are two recess 242, they may be annularly arranged outwards in sequence with the sealing opening 241 as the center. The shape of each depression 242 may be the same or different. Similarly, the number of the pressing portions 244 may be more than one, and when there are two pressing portions 244, they may also be arranged in an annular shape with the sealed opening 241 as the center. In some embodiments, the pinched portions 244 can also be provided between adjacent recesses 242, although the pinched portions 244 are not provided between adjacent recesses 242, thereby avoiding complete blockage of adjacent recesses 242.

The seal 240 may be made of a flexible material having elasticity, thereby providing some deformability for better sealing of the insertion tool and reduction.

Referring to fig. 14-16, in another embodiment, cannula assembly 200 further includes a fluid control valve 250. The cannula body 210 (only the lower seat 211 is shown in fig. 14) has a first fluid passage 202 communicating with the insertion lumen 201, the first fluid passage 202 being used for fluid ingress and egress to the insertion lumen 201. The first fluid passage 202 has a first end 2021 and a second end 2022 disposed opposite to each other, the first end 2021 being adapted to interface with the fluid control valve 250, and the second end being in communication with the insertion chamber 201.

The fluid control valve 250 is mainly used for injecting gas into the abdominal cavity, leading the gas in the abdominal cavity out of the body, flushing the abdominal cavity during surgery, and the like. Which is a valve element capable of controlling the passage of fluid, the fluid control valve 250 includes, but is not limited to, a gas injection valve as is typical in a trocar. The fluid control valve 250 includes a valve seat 251 and a valve element 252. The valve seat 251 has a second fluid passage 2511, and the spool 252 is installed in the second fluid passage 2511 to shut off and open the second fluid passage 2511. Referring to fig. 14-16, in one embodiment, the valve seat 251 has a spool cavity 2516 in communication with the second fluid passage 2511, and the spool 252 is received in the spool cavity 2516 and blocks the second fluid passage 2511. The valve body 252 has a through hole 2521, and the valve body 252 is rotated to communicate and displace the through hole 2521 with the second fluid passage 2511, thereby opening and closing the second fluid passage 2511.

The fluid control valve 250 is fixedly connected to the cannula body 210, which may or may not be detachable. Preferably, the removable attachment is selectively removable for ease of access and replacement. The valve seat 251 has oppositely disposed first and

second ends

2512 and 2513, with a second fluid passage 2511 extending through the first and

second ends

2512 and 2513. The first end 2512 serves as an external interface for interfacing with an external device. An end surface 2514 of the second end 2513 of the valve seat 251 is disposed opposite the end surface 203 of the first end 2021 of the first fluid passageway 202 and sealingly abuts such that the second fluid passageway 2511 communicates with the first fluid passageway 202. The sealing structure is simpler and more stable, and is not easy to leak gas and separate.

In one embodiment, the end surface 2514 of the second end 2513 of the valve seat 251 and the end surface 203 of the first end 2021 of the first fluid pathway 202 may be sealingly engaged by a tight fit or other means (e.g., bonding, welding, etc.). The tight fit sealing of the two end faces can be realized by direct pressing contact of the two end faces and can also be realized by other sealing parts. Referring to fig. 14 to 16, in one embodiment, a sealing ring 223 is disposed between the end surface 2514 of the second end 2513 of the valve seat 251 and the end surface 203 of the first end 2021 of the first fluid passage 202 for sealing, and the material properties of the sealing ring 223 are used to achieve better sealing effect.

The fastening of the cannula body 210 to the fluid control valve 250 can be accomplished in a variety of ways, and referring to fig. 14-16, in one embodiment, the cannula body 210 has a snap-fit structure to which the fluid control valve 250 is removably snap-fit.

Specifically, the snap fit structure includes a snap fit portion 2113, the snap fit portion 2113 being located outside of the end face 203 of the first end 2021 of the first fluid passageway 202, which forms a valve mounting cavity 2113 with the end face 203 of the first end 2021 of the first fluid passageway 202. Second end 2513 of valve seat 251 is seated in valve mounting cavity 2113. The clamping portion 2113 is clamped to the valve seat 251, so that the fluid control valve 250 is in sealing contact with the casing main body 210.

To enhance the fixing effect, referring to fig. 14 to 16, in one embodiment, the sleeve main body 210 has a notch 2114, and at least one of the clamping portions 2113. Wherein the clip portion 2113 is provided at the notch 2114. Valve mounting cavity 2113 and notch 2114 are open above, and fluid control valve 250 may be snapped onto valve mounting cavity 2113 and notch 2114 from above. The valve seat 251 is mounted in a valve mounting cavity 2113 and an indentation 2114, with a second end 2513 of the valve seat 251 located within the valve mounting cavity 2113. The clamping portion 2113 is clamped and fixed with the valve seat 251 from two opposite directions, so that the uniformity of stress is kept, and the sealing effect is improved.

Further, with continued reference to fig. 14-16, in one embodiment, the second end 2513 of the valve seat 251 is a boss structure. The bottom wall of notch 2114 is higher than the bottom wall of valve mounting cavity 2113, such that valve mounting cavity 2113 forms a sunken configuration that, when second end 2513 of valve seat 251 is fitted into valve mounting cavity 2113, confines second end 2513 of second fluid passage 2511 within valve mounting cavity 2113 in the axial direction of second fluid passage 2511, preventing valve seat 251 from being displaced axially outward, disrupting the sealing effect.

The assembly structure can realize quick installation, can ensure that the fluid control valve 250 is tightly attached to the sleeve main body 210, and has a stable and durable sealing structure. Of course, in addition to this, other means for fixing may be used, for example by screwing or gluing.

Further, referring to fig. 14, in one embodiment, the sleeve body 210 has an inner ring 2116, an outer ring 2117, and a tube 2111. Inner race 2116 communicates with the interior cavity of tube 2111 and forms insertion cavity 201. The outer ring 2117 is sleeved outside the inner ring 2116, and the two are connected into a whole. The first fluid passage 202 extends through the inner race 2116, and the notch 2114 is provided in the outer race 2117. Valve mounting cavity 2113 is located in the area between inner race 2116 and outer race 2117.

Referring to fig. 14 to 16, in an embodiment, the valve seat 251 has a positioning plate 2514, the positioning plate 2514 has a positioning protrusion 2515, and the engaging portion 2113 is engaged with the positioning protrusion 2515. The catching portion 2113 has a downward hook portion hooked downward on the positioning protrusion 2515 to press the valve seat 251 downward against the sleeve main body 210. Of course, the engagement portion 2113 may fix the valve seat 251 from another direction.

Referring to fig. 14-16, in one embodiment, the end surface 203 of the first end 2021 of the first fluid passageway 202 and the end surface 2514 of the second end 2513 of the valve seat 251 are matingly planar. Further, in one embodiment, the end surface 203 of the first end 2021 of the first fluid passageway 202 and the end surface 2514 of the second end 2513 of the valve seat 251 are provided with matching slopes, and more specifically, the end surface 203 of the first end 2021 of the first fluid passageway 202 may have a slope from top to bottom while the end surface 2514 of the second end 2513 of the valve seat 251 is shaped in the opposite direction to allow for top-down installation.

Of course, in other embodiments, the end surface 203 of the first end 2021 of the first fluid passageway 202 and the end surface 2514 of the second end 2513 of the valve seat 251 may have other mating shapes, such as a concave-convex relief surface.

In another aspect, the present application, in one embodiment, also provides an improvement in a lancet assembly.

Referring to fig. 17 to 19, in one embodiment, unlike the prior art metal and plastic split structure, the needle shaft 110 is a one-piece structure, so that the needle shaft is simpler to manufacture and less expensive. In one embodiment, the needle shaft 110 is integrally formed of plastic, which further reduces manufacturing costs.

The needle shaft 110 has a shaft cavity 111, an upper end opening 1111 of the shaft cavity 111, and the shaft cavity 111 has a closed side cavity wall 1112. The side chamber wall 1112 has no openings and therefore no sealing structure in the rod chamber 111 is required to prevent liquid or gas from flowing into the rod chamber 111.

The shaft holder 120 has a shaft holder through hole 121, the needle shaft 110 is fixedly connected with the shaft holder 120, and the shaft holder through hole 121 communicates with an opening 1111 of the needle shaft 110 for inserting an auxiliary tool, such as an endoscope, into the shaft cavity 111 to assist an operator in performing a puncturing operation.

Referring to fig. 20 and 21, in one embodiment, the outer periphery of the side cavity wall 1112 has a plurality of grooves 1113 arranged along the axial direction of the rod cavity 111, and the cavities of the grooves 1113 are not communicated with the rod cavity 111. The liquid storage space can be used for storing lubricating oil or other liquid, so that the resistance of the needle rod 110 when the needle rod 110 punctures the body is reduced, and the needle rod 110 can be inserted and pulled out more easily. Moreover, the groove 1113 is configured to guide the liquid on the needle rod 110 to slide down along the groove 1113, so as to prevent the liquid particles from being caught on the outer wall of the needle rod 110. The reservoirs can be uniformly or randomly distributed around the side chamber wall 1112.

Referring to fig. 20 and 21, in one embodiment, the recess 1113 extends to the tip of the needle 1114 of the needle shaft 110. The depth A1 of the groove 1113 can be flexibly set according to actual requirements, in a better embodiment, the value range of the depth A1 is more than 0 and less than A1 and less than or equal to 0.5mm, the value can obtain better lubricating effect and anti-hanging liquid effect, the size of the needle rod 110 can be ensured to be in a reasonable range, and the needle rod 110 does not need to be large in size.

Further, referring to fig. 21 and 22, in one embodiment, the needle 1114 of the needle shaft 110 has a protruding blade 1115, the blade 1115 is provided with a rounded corner 1116 at the junction with the outer wall of the needle 1114. The rounded corners 1116 are designed to assist in the fall-off of liquid particles that may become caught on the needle 1114 and blade 1115.

Further, referring to fig. 17 to 19, in one embodiment, the needle shaft 110 has a shaft portion 112 and a fitting portion 113. The rod portion 112 is fixedly disposed at the bottom of the fitting portion 113. The stem cavity 111 is disposed through the fitting portion 113 and extends into the stem portion 112.

The fitting portion 113 has a fitting structure on which the rod seat 120 is mounted. The assembly of the two can be clamping, tight fit, screw joint or other fixing modes. Generally, the shank holder 120 and the needle shank 110 are detachably assembled to each other, so that they can be easily removed and replaced. Of course, in some embodiments, non-removable fixing between the shaft holder 120 and the needle shaft 110 may be adopted, such as non-removable gluing or welding.

Specifically, referring to fig. 17 to 19, in one embodiment, the mounting portion 113 has a plate-shaped bottom plate 1131, the rod portion 112 is fixedly disposed at the bottom of the plate-shaped bottom plate 1131, and the mounting structure is disposed on the plate-shaped bottom plate 1131. The plate-shaped bottom plate 1131 is horizontally placed, and the rod 112 is fixed below the plate-shaped bottom plate 1131.

With continued reference to fig. 17-19, in one embodiment, the rod base 120 includes a rod base cover 122 and a fastener 123. The catch 123 spans over the opening 1111 of the rod cavity 111. The rod seat outer cover 122 is fixedly installed on the disc-shaped bottom plate 1131, and the rod seat through hole 121 is arranged in the middle of the rod seat outer cover 122 and the fastener 123 in a penetrating manner. The rod seat outer cover 122 and the middle part of the fastener 123 are both provided with through

holes

1221 and 1231, and the two through

holes

1221 and 1231 are aligned to form a rod seat through hole 121. The rod seat through-hole 121 is aligned with the opening 1111 of the rod cavity 111 to facilitate insertion of an auxiliary tool from the rod seat 120 into the rod cavity 111.

The latch 123 and the rod base outer cover 122 are fixed together, and the two can be realized by tight fit or other methods. In one embodiment, the rod seat outer cover 122 has oppositely disposed notches 1222, and the two ends of the latch 123 are respectively embedded in the corresponding notches 1222. The latch 123 is generally in the shape of an inverted U that is mounted in a bridge configuration on the disc-shaped base 1131. The two ends of the fastener 123 can be provided with a plurality of concave-convex structures 1232 for increasing the friction effect and making the operator hold more stably.

The locking member 123 is mounted on the rod base outer cover 122 in a manner of being capable of moving along the axial direction of the needle bar 110, for example, the hole wall of the through hole of the rod base outer cover 122 extends downwards to form a hollow cylinder 1223, and the locking member 123 can be sleeved on the cylinder 1223 and can move up and down along the cylinder 1223. The upper end of the disk-shaped base 1131 may abut the post 1223. At least one end of the locking member 123 has a locking portion 1233, the disc-shaped bottom plate 1131 has an opening 1132 corresponding to the locking portion 1233, and the locking portion 1233 penetrates through the disc-shaped bottom plate 1131. The latch 1233 is used to connect to a sheath cap assembly or a cannula assembly to secure the needle assembly 100 to a corresponding sheath assembly or cannula assembly.

Referring to fig. 18-19, in one embodiment, the plate-shaped base plate 1131 may have at least one mounting post 1134 thereon, and the mounting post 1134 is tightly fitted into the mounting post hole 1223 of the rod base outer cover 122 for fixing. Of course, in other embodiments, other fixing manners may be adopted to realize the fixing.

Further, referring to fig. 17 to 19, in an embodiment, the rod seat 120 further includes a self-locking latch 124. Self-locking latch 124 is pivotally mounted to disk-shaped base 1131, and one end of self-locking latch 124 extends into opening 1111 of shaft cavity 111 for locking an auxiliary tool inserted into shaft cavity 111. When the auxiliary tool is inserted, one end of the self-locking fixture block 124 is driven to turn downwards until the auxiliary tool is turned to the self-locking position, and the auxiliary tool is locked. When the unlocking is needed, the auxiliary tool can be released by manually pressing the self-locking clamping block 124.

Specifically, referring to fig. 18, in one embodiment, the tray-shaped bottom plate 1131 has two opposite slots 1133, and the slots 1133 are opened upward. The self-locking clamping block 124 has a rotating shaft portion 1241 at both ends, and the rotating shaft portion 1241 is rotatably mounted in the clamping groove 1133.

The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.

Claims

1. A cannula puncture device, comprising:

2. The trocar of claim 1 wherein said first fluid passageway has first and second oppositely disposed ends, said second end of said first fluid passageway being in communication with the insertion lumen; the fluid control valve includes a valve seat having a second fluid passage and a valve element installed in the second fluid passage to shut off and open the second fluid passage; the valve seat is fixedly connected with the sleeve main body, the valve seat is provided with a first end and a second end which are arranged oppositely, the second fluid channel penetrates through the first end and the second end of the valve seat, the end face of the second end of the valve seat is arranged oppositely to the end face of the first end of the first fluid channel and is in sealing butt joint, and the second end of the valve seat is communicated with the first end of the first fluid channel.

3. The cannula puncture instrument according to claim 1 or 2, wherein the needle shaft has a shaft cavity, an upper end of the shaft cavity is open, and the shaft cavity has a closed side cavity wall, and the shaft base has a shaft base through hole communicating with the opening of the needle shaft for insertion of an auxiliary tool into the shaft cavity.

4. The trocar of claim 1 wherein said recessed portion is disposed around said sealing port, said raised portion corresponds to said recessed portion, the wall of said recessed portion between said sealing port and said raised portion is an inner chamber wall, the wall of the other side of said recessed portion opposite to said inner chamber wall is an outer chamber wall, and at least one of said inner chamber wall and said outer chamber wall has a gap with said raised portion.

5. The cannula puncture instrument of claim 4, wherein the recess is annularly shaped, and the sealing port is located in an area enclosed by an inner ring of the recess; the convex parts are distributed annularly.

6. The trocar of claim 1 further including a valve member for controlling the one-way insertion of an insertion tool, said valve member being mounted within said insertion cavity, said insertion tool being insertable into and through said valve member from an inlet end thereof; the convex part is convexly arranged along the pulling-out direction of the inserting tool, the concave part is concavely arranged along the pulling-out direction of the inserting tool, and the convex part and the sealing piece are positioned on one side of the inlet end of the valve piece.

7. The cannula puncture instrument of claim 6, wherein the sealing member is positioned above the valve member inlet end, and wherein:

8. The trocar of claim 1 wherein the gap b between the cavity wall of the recessed cavity and the raised portion has a range of values: b is more than or equal to 0.5mm and less than or equal to 10 mm.

9. The cannula puncture instrument as claimed in claim 1, wherein the cannula main body comprises an upper housing and a lower housing, the insertion cavity is penetratingly disposed on the upper housing and the lower housing, the supporting frame and the sealing member are disposed between the upper housing and the lower housing, the sealing member has a pressing portion, the pressing portion is disposed on a side of the recessed portion away from the sealing port, and the pressing portion of the supporting frame and the sealing member is clamped and fixed by the upper housing and the lower housing.

10. The cannula puncture device according to claim 9, wherein the pressing portion has a concave shape with a concave direction opposite to the concave direction; the cross section of the concave part is U-shaped, V-shaped, circular arc or square.

11. The cannula puncture instrument of claim 2, wherein a seal is disposed between the second end surface of the valve seat and the first end surface of the first fluid passage for sealing.

12. A block of bushings according to claim 2, characterized in that the first end face of the first fluid channel and the second end face of the valve seat are matching flat, bevelled or undulating surfaces.

13. The cannula puncture instrument according to claim 12, wherein the cannula main body has a catching portion, the catching portion is located outside the first end surface of the first fluid channel and forms a valve installation cavity with the first end surface of the first fluid channel, the second end of the fluid control valve is installed in the valve installation cavity, and the catching portion is fixed to the valve seat in a catching manner.

14. The cannula puncture device according to claim 13, wherein the cannula main body has a notch, the at least one engagement portion is provided at the notch, the valve mounting chamber and the notch are open, the valve seat is mounted in the notch, and the engagement portion is engaged with the valve seat from two opposite directions.

15. The cannula puncture device according to claim 14, wherein a portion of the valve seat corresponding to the second end of the second fluid passage is a boss structure, and a bottom wall of the notch is higher than a bottom wall of the valve installation chamber to define the second end of the valve seat in the valve installation chamber in an axial direction of the second fluid passage.

16. The cannula puncture instrument of claim 14, wherein the cannula body has an inner ring, an outer ring, and a tube, the inner ring communicating with the tube and forming an insertion cavity, the outer ring being disposed about the inner ring, the first fluid passage extending through the inner ring, the notch being disposed on the outer ring, the valve mounting cavity being located in a region between the inner ring and the outer ring; the valve seat is provided with a positioning plate, the positioning plate is provided with a positioning bulge, and the clamping part is fixedly clamped with the positioning bulge.

17. The lancet assembly of claim 3, wherein the outer peripheral surface of the sidewall wall has a plurality of axially disposed grooves along the shaft lumen.

18. The needle assembly of claim 17 wherein said recess extends to the tip of the needle shaft.

19. The needle assembly of claim 17 wherein the depth a1 of the recess ranges from 0 < a1 ≤ 0.5 mm.

20. The needle assembly of claim 17 wherein the needle tip of the needle shaft has a raised blade edge, the blade edge being radiused to the outer wall of the needle tip.

21. The cannula puncture device of claim 3, wherein the needle shaft is made of plastic or metal material; the needle bar is of an integrally formed structure.