A type of cannula

Abstract

This utility model relates to the field of medical device technology, and more particularly to a cannula. The cannula includes a cannula, a shell, and an instrument sealing assembly, wherein the distal end of the shell is attached to the proximal end of the cannula; the instrument sealing assembly is located inside the shell and includes multiple sealing segments overlapping to form a cone shape with a central first hole; each sealing segment includes a central sealing component and a reinforcing surface disposed on the central sealing component, the reinforcing surface sealing the gaps between the sealing segments. The overlapping sealing segments forming a cone shape with a central first hole allow the instrument to pass through the first hole and compress each sealing segment. The reinforcing surface on the central sealing component seals the gaps between adjacent sealing segments. Therefore, by providing the reinforcing surface, the gaps between adjacent sealing segments can be eliminated, improving the overall sealing effect and preventing gas or liquid leakage during surgery.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a cannula needle. Background Technology

[0002] Minimally invasive surgery requires the use of a trocar. The main function of the trocar is to establish and maintain a working channel into the abdominal or thoracic cavity in general surgery, thoracic surgery, gynecology, and urology. To ensure that the doctor and his surgical instruments have a good operating space, gas needs to be injected into the patient's body after the channel is established to increase the operating space. However, the trocar has poor sealing performance, and gas and liquid leakage is prone to occur during the operation.

[0003] Therefore, there is an urgent need for a cannula to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this invention is to provide a cannula needle that can improve the puncture effect and avoid the problem of gas or liquid leakage during surgery.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A cannula is provided, comprising:

[0007] casing;

[0008] A housing, the distal end of which is attached to the proximal end of the sleeve; and

[0009] The instrument sealing assembly located within the housing includes a plurality of sealing segments that overlap to form a cone shape having a first hole at the center;

[0010] The sealing section includes a central sealing component and a reinforcing surface disposed on the central sealing component, wherein the reinforcing surface closes the gap between the sealing sections.

[0011] As an alternative technical solution for the aforementioned cannula, the sealing section further includes an opening defined by a central sealing component; the central sealing component further defines a first arc center, and the opening defines a second arc center, wherein the first arc center and the second arc center are different.

[0012] As an optional technical solution for the aforementioned cannula, the reinforcing surface includes a first reinforcing surface defining the center of a third arc, wherein the center of the third arc is the same as the center of the second arc.

[0013] As an optional technical solution for the aforementioned cannula, the sealing section further includes a flange, and the central sealing component extends outward from the flange; the reinforcing surface further includes a second reinforcing surface opposite to the first reinforcing surface, and the second reinforcing surface overlaps with the flange.

[0014] As an optional technical solution for the aforementioned cannula, the reinforcing surface further includes a third reinforcing surface between the first reinforcing surface and the second reinforcing surface, the third reinforcing surface sealing the gap between the sealing sections.

[0015] As an optional technical solution for the aforementioned cannula, the four sealing sections each include an assembly guide rib located on the flange, and the assembly guide ribs are offset from each other by 90 degrees.

[0016] As an alternative technical solution for the aforementioned cannula, the central sealing component has a conical shape, and the thickness of the central sealing component gradually increases from the bottom to the top of the cone.

[0017] As an optional technical solution for the aforementioned cannula, the four sealing sections each have a circumference of 180 degrees to 270 degrees.

[0018] As an alternative technical solution for the aforementioned cannula, it also includes a retainer ring with a retainer pin; the sealing section further includes a second hole placed on the retainer pin.

[0019] As an optional technical solution for the aforementioned cannula, a filling device capable of sliding in and out of the cannula is also included.

[0020] This utility model has at least the following beneficial effects:

[0021] The cannula includes a cannula, a housing, and an instrument sealing assembly. The distal end of the housing is attached to the proximal end of the cannula. The instrument sealing assembly is located within the housing and includes multiple sealing segments that overlap to form a cone shape with a central first hole. Each sealing segment includes a central sealing component and a reinforcing surface disposed on the central sealing component, the reinforcing surface sealing the gaps between the sealing segments. The overlapping sealing segments form a cone shape with a central first hole, allowing the instrument to pass through the first hole and compress each sealing segment. The reinforcing surface on the central sealing component seals the gaps between adjacent sealing segments. Therefore, by providing the reinforcing surface, the gaps between adjacent sealing segments can be eliminated, improving the overall sealing effect and preventing gas or liquid leakage during surgery. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the cannula provided in an embodiment of the present utility model;

[0024] Figure 2 An exploded view of the cannula provided in an embodiment of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the sealing assembly provided in an embodiment of the present utility model;

[0026] Figure 4 A top view of the sealing assembly provided in an embodiment of this utility model;

[0027] Figure 5 A bottom view of the sealing assembly provided in an embodiment of this utility model;

[0028] Figure 6 An exploded view of the sealing assembly provided in an embodiment of this utility model;

[0029] Figure 7 A bottom view of the sealing sheet provided in an embodiment of this utility model;

[0030] Figure 8 A schematic diagram of the structure of the sealing sheet provided in the embodiment of this utility model;

[0031] Figure 9 This is a cross-sectional view of the sealing sheet provided in an embodiment of the present invention.

[0032] In the picture:

[0033] 1. Sleeve; 2. Housing; 20. Instrument sealing assembly; 21. Sealing section; 211. Central sealing component; 212. Reinforcing surface; 2121. First reinforcing surface; 2122. Second reinforcing surface; 2123. Third reinforcing surface; 213. Opening; 214. Flange; 215. Second hole; 216. Assembly guide rib; 22. First hole; 23. Retainer ring; 231. Retainer pin; 3. Filler. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] This invention provides a cannula needle that improves puncture effectiveness and avoids gas or liquid leakage during surgery.

[0039] like Figures 1 to 7As shown, the cannula includes a cannula 1, a housing 2, and an instrument sealing assembly 20, wherein the distal end of the housing 2 is attached to the proximal end of the cannula 1; the instrument sealing assembly 20 is located inside the housing 2, and the instrument sealing assembly 20 includes a plurality of sealing segments 21, which are overlapped to form a cone shape with a first hole 22 at the center; wherein, the sealing segment 21 includes a central sealing component 211 and a reinforcing surface 212 disposed on the central sealing component 211, and the reinforcing surface 212 closes the gap between the sealing segments 21.

[0040] In this embodiment, the sealing segments 21 overlap to form a cone shape with a first hole 22 in the center. The instrument can pass through the first hole 22 and squeeze each sealing segment 21. The central sealing component 211 is provided with a reinforcing surface 212, which can seal the gap between adjacent sealing segments 21. Therefore, by providing the reinforcing surface 212, the gap between adjacent sealing segments 21 can be eliminated, the overall sealing effect can be improved, and gas or liquid leakage problems can be avoided during the operation.

[0041] like Figure 7 As shown, in some embodiments, the sealing segment 21 further includes an opening 213 defined by a central sealing member 211; the central sealing member 211 also defines a first arc center, and the opening 213 defines a second arc center, the first arc center and the second arc center being different. Each sealing segment 21 has an opening 213, so that when multiple sealing segments 21 overlap, the openings 213 of each sealing segment 21 enclose to form a first hole 22. This arrangement can increase the tension of the sealing segment 21 to facilitate instrument insertion. Since the first arc center of the central sealing member 211 and the second arc center of the opening 213 are different, this arrangement of the sealing segment 21 can increase the clamping force of the sealing segment 21 on the sleeve 1.

[0042] like Figure 7 As shown, in some embodiments, the reinforcing surface 212 includes a first reinforcing surface 2121 defining a third arc center, the third arc center being the same as the second arc center. It is understood that the second arc center coincides with the third arc center; this arrangement improves the fit between adjacent reinforcing surfaces 212, thereby enhancing the sealing performance of the instrument sealing assembly 20.

[0043] In some embodiments, the sealing segment 21 further includes a flange 214, and the central sealing member 211 extends outward from the flange 214; the reinforcing surface 212 further includes a second reinforcing surface 2122 opposite to the first reinforcing surface 2121, and the second reinforcing surface 2122 overlaps with the flange 214. It should be noted that the first reinforcing surface 2121 and the second reinforcing surface 2122 are inclined relative to the central sealing member 211. The arrangement of the second reinforcing surface 2122 allows the sealing segment 21 to achieve a transitional fit with the reinforcing surface 212 on the adjacent sealing segment 21 after the adjacent sealing segments 21 are fitted together, thereby preventing gaps from forming between the reinforcing surface 212 and the adjacent sealing segments 21, and improving the sealing performance between the adjacent sealing segments 21.

[0044] like Figure 5 and Figure 7 As shown, in some embodiments, the reinforcing surface 212 further includes a third reinforcing surface 2123 between the first reinforcing surface 2121 and the second reinforcing surface 2122, the third reinforcing surface 2123 closing the gap between the sealing sections 21. The third reinforcing surface 2123 connects the first reinforcing surface 2121 and the second reinforcing surface 2122, thereby ensuring that the reinforcing surface 212 fits tightly against the adjacent central sealing component 211, improving the overall sealing performance of the instrument sealing assembly 20.

[0045] like Figure 8 and Figure 9 As shown, in some embodiments, the central sealing member 211 has a conical shape, and the thickness of the central sealing member 211 gradually increases from the bottom to the top of the cone. This results in the central sealing member 211 being thinner at the bottom of the cone and thicker at the top, the purpose of which is to further reduce resistance during instrument insertion and removal while ensuring a tight seal.

[0046] like Figure 6 and Figure 8 As shown, in some embodiments, there are four sealing segments 21. Each of the four sealing segments 21 includes an assembly guide rib 216 located on the flange 214, with the assembly guide ribs 216 offset from each other by 90 degrees. It should be noted that all four sealing segments 21 are provided with assembly guide ribs 216, which are offset from each other by 90 degrees. The assembly guide ribs 216 provide guidance for the sealing segments 21 during overlap, enabling rapid assembly of each sealing segment 21. Furthermore, having four sealing segments 21 provides a better sealing effect compared to other numbers, and the stress on each individual sealing segment 21 is better. The radius of the first hole 22 is larger, allowing for smooth expansion after instrument insertion without causing damage to the sealing segment 21. Additionally, the friction and tension of the four sealing segments 21 are lower.

[0047] In some embodiments, the number of sealing segments 21 is four, each with a circumference of 180 degrees to 270 degrees. It should be noted that in some embodiments, each sealing segment 21 has the same circumferential angle, meaning the circumferential angle of the central sealing member 211 of each sealing segment 21 is the same. Of course, in other embodiments, some sealing segments 21 have the same circumferential angle, and in still other embodiments, each sealing segment 21 has a different circumferential angle. This arrangement increases the number of layers of central sealing members 211 in the same area, increasing the contact area between the central sealing members 211 and further reducing gaps.

[0048] like Figure 6 As shown, in some embodiments, the cannula needle further includes a retainer ring 23 with a retainer pin 231; the sealing section 21 also includes a second hole 215 placed on the retainer pin 231. Four sealing sections 21 are stacked circumferentially along the retainer ring 23, and the retainer pin 231, after passing through the second hole 215, can keep the sealing section 21 in a bent state. Multiple second holes 215 are provided on the sealing section 21, so that a single sealing section 21 can be fixed by multiple retainer pins 231. The retainer ring 23 improves the assembly efficiency of the multiple sealing sections 21 and fixes the position of the sealing sections 21.

[0049] like Figure 3 As shown, in some embodiments, the cannula also includes a filler 3 that can slide in and out of the cannula 1. The filler 3 can seal through the instrument sealing assembly 20 to facilitate instrument insertion and provide guidance for the instrument.

[0050] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A trocar, characterized by include: Sleeve (1); The outer casing (2) has its distal end attached to the proximal end of the sleeve (1); and The instrument sealing assembly (20) located inside the housing (2) includes a plurality of sealing segments (21) which are overlapped to form a cone shape having a first hole (22) at the center; The sealing section (21) includes a central sealing component (211) and a reinforcing surface (212) disposed on the central sealing component (211), wherein the reinforcing surface (212) closes the gap between the sealing sections (21).

2. The trocar of claim 1 wherein, The sealing section (21) further includes an opening (213) defined by a central sealing member (211); the central sealing member (211) further defines a first arc center, and the opening (213) defines a second arc center, the first arc center and the second arc center being different.

3. The trocar of claim 2, wherein, The reinforcing surface (212) includes a first reinforcing surface (2121) defining the center of a third arc, which is the same as the center of the second arc.

4. The trocar of claim 3, wherein, The sealing section (21) further includes a flange (214), and the central sealing component (211) extends outward from the flange (214); the reinforcing surface (212) further includes a second reinforcing surface (2122) opposite to the first reinforcing surface (2121), and the second reinforcing surface (2122) overlaps with the flange (214).

5. The trocar of claim 4, wherein, The reinforcing surface (212) further includes a third reinforcing surface (2123) between the first reinforcing surface (2121) and the second reinforcing surface (2122), the third reinforcing surface (2123) closing the gap between the sealing sections (21).

6. The trocar of claim 4 wherein, The number of sealing sections (21) is four, and each of the four sealing sections (21) includes an assembly guide rib (216) located on the flange (214), and the assembly guide ribs (216) are offset from each other by 90 degrees.

7. The trocar of any of claims 1-5, wherein, The central sealing component (211) has a conical shape, and the thickness of the central sealing component (211) gradually increases from the bottom to the top of the cone.

8. The trocar of any of claims 1-5, wherein, The number of sealing sections (21) is four, and the four sealing sections (21) each have a circumference of 180 degrees to 270 degrees.

9. The trocar of any of claims 1-5, wherein, It also includes a retainer ring (23) with a retainer pin (231); the sealing section (21) also includes a second hole (215) placed on the retainer pin (231).

10. The trocar of any one of claims 1-5, wherein, It also includes a filler (3) that can slide in and out of the sleeve (1).

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