CN109984812B

CN109984812B - Coreless puncture outfit

Info

Publication number: CN109984812B
Application number: CN201711498349.2A
Authority: CN
Inventors: 孙宝峰; 马猛
Original assignee: Jiangsu Fengh Medical Equipment Co Ltd
Current assignee: Jiangsu Fengh Medical Equipment Co Ltd
Priority date: 2017-12-31
Filing date: 2017-12-31
Publication date: 2020-10-09
Anticipated expiration: 2037-12-31
Also published as: CN109984812A

Abstract

The invention discloses a coreless puncture outfit, which comprises a cannula assembly and a puncture body assembly, wherein at least one part of the puncture body assembly is fixedly connected with the cannula assembly; the protective shell can elastically deform or return to an initial state to allow the piercing tip to emerge from the bottom of the protective shell or to be covered by the protective shell. The coreless puncture outfit is convenient to use, not only saves the preparation cost of the whole puncture outfit, but also saves the packaging cost of the puncture outfit, and simultaneously, the design of the puncture body assembly also integrally improves the operation safety of the coreless puncture outfit.

Description

Coreless puncture outfit

Technical Field

The invention relates to a surgical instrument, in particular to a coreless puncture outfit, belonging to the field of medical equipment.

Background

The puncture outfit is used as an indispensable surgical instrument in various minimally invasive surgeries, and has a very large using amount. The traditional puncture outfit comprises a puncture core bar, a puncture sleeve and a sealing component, wherein the puncture sleeve and the sealing component jointly form a channel for the puncture core bar, other surgical instruments and the abdominal cavity of a patient to be inflated; the sealing assembly is arranged in the puncture sleeve and used for avoiding gas injected into the abdominal cavity from leaking out and ensuring stable pneumoperitoneum so as to carry out the operation normally, and the puncture core rod is inserted into the puncture sleeve through the sealing assembly and used for realizing puncture on the abdominal cavity of a patient and driving one end of the puncture sleeve to enter the abdominal cavity of the patient.

In the specific operation process, a doctor generally firstly cuts a small incision on the abdomen of a patient, then aligns the top of the puncture core rod with the small incision to reciprocate and move downwards, and drives one end of the puncture sleeve to enter the abdominal cavity of the patient. After the puncture is finished, the puncture core bar is pulled out of the puncture sleeve, and other procedural instruments can enter and exit from a channel formed by the puncture sleeve.

Due to the existence of the puncture core rod, the manufacturing, packing and transportation costs of the puncture device are increased, the puncture core rod is easy to damage the viscera, and the puncture core rod is discarded after being used, thereby causing waste.

Based on the above situation, on the basis of ensuring the puncture performance of the puncture outfit, the main improvement direction of the existing puncture outfit is to simplify the structure, reduce the cost and improve the performance

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a coreless puncture outfit, which solves the problems that the puncture outfit in the prior art is high in manufacturing cost and packaging cost and has certain potential safety hazard in puncture operation.

The invention is realized by the following technical scheme: a coreless puncture outfit comprises a cannula assembly and a puncture body assembly, wherein at least one part of the puncture body assembly is fixedly connected with the cannula assembly, the puncture body assembly comprises a puncture assembly and a protective shell, the puncture assembly comprises a puncture tip, the protective shell is made of elastic materials, and in an initial state, the protective shell covers the puncture tip; the protective shell can be elastically deformed or restored to an original state to allow the puncture tip to be exposed from the bottom of the protective shell or to be covered by the protective shell.

Preferably, the cannula assembly includes a first end and a second end, a puncture body assembly is fixedly disposed on the second end of the cannula assembly, a puncture tip of the puncture assembly protrudes out of an end face of the second end of the cannula assembly, the protective housing includes an upper housing and a lower housing, the upper housing is directly or indirectly fixedly connected with the cannula assembly, and the lower housing covers the puncture tip of the puncture assembly.

Further, the puncture body assembly further comprises an annular sleeve, the puncture assembly is fixedly arranged on the inner wall of the annular sleeve, the puncture tip of the puncture assembly protrudes out of the bottom edge of the annular sleeve, the protective shell is arranged on the outer wall of the annular sleeve and corresponds to the puncture assembly in position, and the annular sleeve is sleeved on the second end of the sleeve assembly.

Preferably, the annular sleeve is provided with an assembly hole, the puncturing part is provided with a positioning block, and the positioning block is embedded into the assembly hole.

Preferably, the protective shell and the annular sleeve are connected in any one of bonding, welding, riveting or clamping.

Preferably, the sleeve assembly comprises an upper sleeve and a lower sleeve, central axes of the upper sleeve and the lower sleeve are aligned along an axial direction, an outer diameter of the lower sleeve is smaller than an outer diameter of the upper sleeve, a connecting portion of the upper sleeve and the lower sleeve forms a step surface, a lower end of the lower sleeve is a second end of the sleeve assembly,

the annular sleeve is sleeved on the outer wall of the lower sleeve, and the top of the annular sleeve is abutted to the step surface.

Preferably, the outer diameter of the annular sleeve is the same as the outer diameter of the upper casing.

Furthermore, a plurality of bulges are distributed on the step surface,

the top edge of the annular sleeve is provided with a plurality of clamping grooves corresponding to the protrusions, and the protrusions are embedded into the corresponding clamping grooves.

Preferably, the annular sleeve is divided into a first side and a second side along the circumferential direction, the bottom of the second side is higher than the bottom of the first side, and the puncture element and the protective shell are correspondingly arranged on the first side of the sleeve wall.

Preferably, a notch is formed in the first side of the lower sleeve corresponding to the annular sleeve, and the upper part of the puncture piece is embedded into the notch.

Preferably, the annular sleeve the first side with link to each other through the transition face between the second side, the transition face is followed first side direction the second side extends and includes first arc surface and second arc surface in proper order, the radius of first arc surface is greater than the radius of second arc surface.

Further, the transition surface further comprises a third arc surface, and the arc surface curve of the first arc surface, the arc surface curve of the second arc surface and the arc surface curve of the third arc surface form a reverse curve.

Compared with the prior art, the invention has the beneficial effects that: the coreless puncture outfit sleeve assembly is not provided with a puncture core bar any more, but a puncture assembly is arranged on the pipe wall at one side of the sleeve assembly. When the puncture body assembly is in an initial state, the protective shell covers the puncture tip of the puncture piece, when the puncture body assembly is in a puncture operation state, the protective shell generates elastic deformation under the blocking of the abdominal wall, and the puncture tip of the puncture piece is exposed from the bottom of the protective shell. After the puncture body assembly realizes puncture, surgical instruments such as an anastomat and the like can directly enter through an internal channel formed by the sleeve assembly. The design of the puncture body assembly not only saves the preparation cost of the whole puncture device, but also saves the packaging cost of the whole puncture device because the puncture body assembly does not influence the sealing assembly, and the puncture body assembly does not need to be packaged after being disassembled from the sleeve assembly. In addition, in the embodiment, the protective shell of the puncture body assembly returns to the initial state under the action of elastic force when the puncture is completed, namely the protective shell covers the bottom tip of the puncture piece, so that the situation that the puncture tip is downward due to inertia or the puncture outfit rotates to hurt the internal organs in the abdominal cavity of a patient during the operation can be avoided when the puncture is completed, and the coreless puncture outfit has higher safety operability.

Drawings

FIG. 1 is a schematic view of a coreless puncture instrument according to an embodiment of the present invention;

FIG. 2 is an enlarged, fragmentary view of a second end of the coreless penetrator shown in FIG. 1;

FIG. 3 is a partial schematic view of a first state of a coreless puncture instrument according to an embodiment of the present invention during a puncture procedure;

FIG. 4 is a partial schematic view of a second state of a coreless puncture instrument according to an embodiment of the present invention during a puncture procedure;

FIG. 5 is a schematic structural view of a coreless piercer piercing body assembly according to an embodiment of the present invention;

FIG. 6 is an exploded view of a coreless piercer piercing body assembly according to an embodiment of the present invention;

FIG. 7 is a partial schematic view of a coreless piercer cannula assembly according to an embodiment of the present invention.

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, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings. Furthermore, the terms "first", "second" and "first" 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 defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

As shown in FIG. 1, the present embodiment provides a coreless puncture instrument, which includes a cannula assembly 1, a sealing assembly 2 and a puncture body assembly 3, wherein the cannula assembly 1 defines a lumen (i.e., a passage for medical instruments during a surgical procedure) including a first end (not shown) and a second end 12, and the first end (not shown) of the cannula assembly 1 is referred to as an upper port of the cannula assembly 1, and more particularly, a connection portion between the cannula assembly 1 and the sealing assembly 2. The first end of the tube assembly 1 is selectively sealed by the sealing assembly 2, and the structure of the sealing assembly 2 and the connection manner of the sealing assembly 2 and the tube assembly 1 are described in the patent application documents previously filed by the applicant, including CN201710216813.8, CN201710216814.2 and CN201710299930.5, and are not described herein again. The first end (not shown) refers to the upper port of the tube assembly 1, in particular the connection of the tube assembly 1 and the seal assembly 2. The second end 12 of cannula assembly 1 is provided with a piercing body assembly 3. "up" in this embodiment refers to a direction along the central axis of the tube assembly 1 towards the seal assembly 2. "lower" refers to the direction toward the lancet assembly 2 along the central axis of the cannula assembly 1, and the definition of "up" and "down" applies to all components of the coreless lancet of this embodiment. The second end 12 of the cannula assembly 1 is provided with a piercing body assembly 3, said piercing body assembly 3 being adapted to any size cannula assembly 1.

With continued reference to fig. 1 and 6, the lancet assembly 3 includes a lancet, a protective housing 32, and an annular sheath 33.

The bottom of the puncture element is a puncture tip 311, and the puncture element is not limited to a shape, and may be a sheet, a rod, a block, or the like. In one embodiment of the present invention, the piercing member employs a piercing blade 31. The puncture sheet 31 is fixedly arranged on the inner wall of the annular sleeve 33, part of the outer wall of the puncture sheet 31 is attached to part of the inner wall of the annular sleeve 33, the puncture tip 311 protrudes out of the end surface of the second end 12 of the cannula assembly 1 and the bottom edge of the annular sleeve 33, and the puncture sheet 31 is fixedly connected with the annular sleeve 33. Referring to fig. 6, the annular sleeve 33 is provided with an assembling hole 331, the puncturing sheet 31 is provided with a positioning block 312, and the positioning block 312 is inserted into the assembling hole 331 to be installed in a snap fit manner, so that the puncturing sheet 31 is fixed relative to the annular sleeve 33, and the distance of the puncturing tip 311 at the bottom of the puncturing sheet 31 protruding out of the annular sleeve 33 is also fixed, thereby facilitating mass production. In addition, the engagement between the positioning block 312 of the puncturing piece 31 and the fitting hole 331 prevents the puncturing piece 31 from moving or rotating relative to the annular sleeve 33 during puncturing, which would affect the normal operation of puncturing. The protective shell 32 is made of elastic material, and may be medical rubber or the like. The protective case 32 is provided on the outer wall of the annular sheath 33 at a position corresponding to the puncture sheet 31, and the protective case 32 includes an upper case 321 and a lower case 322. The upper shell 321 of the protective shell 32 is fixedly connected to the annular sleeve 33, and the connection manner of the upper shell 321 and the annular sleeve 33 is not limited, and may be any one of bonding, welding, riveting or clamping. The lower shell 322 of the protective shell 32 covers the puncture tip 311 of the puncture sheet 31, and the bottom of the lower shell 322 slightly protrudes out of the bottom of the puncture sheet 31, so that the protective shell 32 can effectively cover the puncture sheet 31 before or after puncture, and the puncture process is convenient to carry out. Further, in order to prevent the positioning block 312 of the puncturing piece 31 from forming a bump on the annular sleeve 33 to affect the normal operation of the coreless puncture device of the present embodiment, the shell of the protective shell 32 is in a semi-enclosed type, and is connected with a part of the outer wall of the annular sleeve 33 to form an accommodating cavity, and the accommodating cavity is covered by the bump formed on the outer wall of the annular sleeve 33 by the puncturing piece 31. Of course, the corners of the protective casing 32 need to be rounded to facilitate the puncturing operation.

After the spike and shield 32 are assembled over the annular sleeve 33, the annular sleeve 33 is fitted over the second end 12 of the cannula assembly 1. Referring again to fig. 6, the annular sheath 33 is circumferentially divided into a first side 333 and a second side 334, the bottom of the second side 334 is higher than the bottom of the first side 333, and the puncturing blade 31 and the protective casing 32 are correspondingly disposed on the wall of the first side 333. The term "higher" means that the distance between the bottom of the second side 334 and the first end of the tube assembly 1 is smaller than the distance between the bottom of the first side 333 and the first end of the tube assembly 1, i.e. the bottom end of the second side 334 is located above the bottom end of the first side 333 when the tube assembly 1 is in the vertical state. As shown in fig. 2, 5 and 6, the first side 333 and the second side 334 of the annular sleeve 33 are connected by a transition surface 335, the transition surface 335 extends from the first side 333 to the second side 334 and sequentially includes a first arc surface 335a, a second arc surface 335b and a third arc surface 335c, central angles of the first arc surface 335a and the second arc surface 335b face the second side 334 of the annular sleeve 33, a radius of the first arc surface 335a is larger than a radius of the second arc surface 335b, and an arc curve of the first arc surface 335a, an arc curve of the second arc surface 335b and an arc curve of the third arc surface 335c form a reverse curve. The reverse curve is a plane linearity formed by connecting two circular curves with opposite rotation directions in a straight line, a gentle curve or a radial direction. The bottom of the annular sleeve 33 is lower on one side and lower on the other side, and a transition surface 335 from the lower side (first side 333) to the higher side (second side 334) is in a form of first steep and then flat, so that during puncturing, a force applied to the puncture instrument is concentrated on the puncture tip 311, and when the bottom end surface of the cannula assembly 1 enters the abdominal cavity of a patient along with the puncture sheet 31, the resistance of the abdominal wall to the puncture instrument is gradually increased and then reduced and kept stable, a doctor can conveniently control the puncture operation in an operation, and the smooth transition surface 335 and the cambered surface are also beneficial to the entry of the second end 12 of the cannula assembly 1, so that the skin of the patient is prevented from being damaged.

As shown in fig. 7, the sleeve assembly 1 comprises an upper sleeve 13 and a lower sleeve 14, the first end of the sleeve assembly 1 is the top end of the upper sleeve 13, and the second end 12 of the sleeve assembly 1 is the bottom end of the lower sleeve 14. The central axes of the upper sleeve 13 and the lower sleeve 14 are aligned along the axial direction, the inner diameter of a channel formed by the upper sleeve 13 is the same as the inner diameter of a channel formed by the lower sleeve 14, the upper space and the lower space of the channel formed by the sleeve assembly 1 for the entry and exit of surgical instruments are consistent, the operation of a doctor is facilitated, the outer diameter of the lower sleeve 14 is smaller than that of the upper sleeve 13, and the connecting part of the upper sleeve 13 and the lower sleeve 14 forms a circular step surface 15. One side of the lower sleeve 14 is opened with a notch 141, and the notch 141 faces the bottom of the lower sleeve 14.

During assembly, the annular sleeve 33 is sleeved on the outer wall of the lower sleeve 14, the central axis of the annular sleeve 33 is overlapped with the central axis of the lower sleeve 14, the top of the annular sleeve 33 is abutted against the step surface 15, the lower port of the lower sleeve 14 is accommodated in the annular sleeve 33, the lower end surface of the lower sleeve 14 is an arc surface or an inclined surface and matched with the annular sleeve 33, the outer wall surface of the lower sleeve 14 is fixedly attached to the inner wall surface of the annular sleeve 33, and the strength of the lower section pipe wall of the coreless puncture outfit is enhanced. The puncture piece 31 fixed on the inner wall surface of the annular sleeve 33 is inserted into the notch 141 of the lower sleeve 14, so that the puncture piece 31 is prevented from shaking left and right or moving up and down during puncturing. The position of the annular sleeve 33 relative to the cannula assembly 1 is limited by the abutting arrangement mode of the annular sleeve 33, namely, the position of the puncture tip 311 relative to the bottom edge of the lower cannula 14 is limited, mass production is facilitated, the annular sleeve 33 can be prevented from moving to the first end of the cannula assembly 1 in the puncture process, and normal puncture operation is guaranteed. The outer diameter of the annular sleeve 33 is the same as that of the upper sleeve 13, the sum of twice the height of the protrusion 16 in the radial direction of the sleeve assembly 1 and the outer diameter of the lower sleeve 14 is equal to that of the upper sleeve 13, and the outer wall of the assembled puncture outfit is smooth as a whole. The connection mode of the annular sleeve 33 and the cannula assembly 1 is not limited, and the annular sleeve 33 and the cannula assembly 1 can be connected in an interference fit mode or a thread screwing mode, and the interference fit mode is preferred to avoid the rotation of the annular sleeve 33 in the puncture process. Further in order to prevent the annular sleeve 33 from rotating relative to the sleeve assembly 1, a plurality of downward protrusions 16 are distributed on the step surface 15 of the sleeve assembly 1, a plurality of clamping grooves 332 are formed in the top edge of the annular sleeve 33, and the protrusions 16 and the clamping grooves 332 are correspondingly clamped one by one. Of course, the manner of engaging and connecting the annular sleeve 33 to the sleeve assembly 1 is not limited to the above-mentioned embodiments, and is well known to those skilled in the art, and therefore, will not be described herein again. When using the coreless puncture instrument, like the conventional puncture instrument, the doctor first makes a small incision on the abdomen of the patient, and then aligns the bottom end of the protective shell 32 of the coreless puncture instrument of this embodiment with the small incision, and at this time, the coreless puncture instrument is in the initial state, as shown in fig. 2, the protective shell 32 covers the puncture tip 311 of the puncture sheet 31. During the puncture process, the doctor applies downward force to the puncture outfit, and the protective shell 32 is made of elastic material, so that the protective shell 32 can be elastically deformed under the obstruction of the abdominal wall. If the blocking force of the abdominal wall against the protective shell 32 is small or if a material with good elasticity, such as silicon rubber or polyurethane rubber, is used for the protective shell 32, the protective shell 32 will contract longitudinally, as shown in fig. 3. The silicon rubber is rubber with a main chain formed by alternating silicon and oxygen atoms, two organic groups are usually connected to the silicon atoms, and the silicon rubber has excellent heat resistance, cold resistance and aging resistance, excellent insulation resistance and dielectric property and good thermal conductivity. The polyurethane rubber is a series of elastomer materials with more urethane groups on the main polymer chain, and has the advantages of excellent tensile strength, tearing strength and wear resistance, oil resistance, excellent ozone resistance and atomic radiation resistance. If the blocking force applied to the protective casing 32 is too large or the material used for the protective casing 32 is not elastic enough, such as natural rubber, the lower casing 322 of the protective casing 32 may bend, as shown in fig. 4. Natural Rubber (NR) is a natural polymer compound containing cis-1, 4-polyisoprene as a main component, and has excellent resilience, tensile strength, elongation, abrasion resistance, tear and compression set properties. Which deformation of the protective tubing shell 32 eventually causes the piercing tip 311 to emerge from the bottom of the protective shell 32, the piercing tip 311 entering the interior of the patient's abdominal cavity along a small incision in the abdomen. When the puncture outfit completes puncture, the lower shell 322 of the protective shell 32 enters the abdominal cavity of the patient along with the puncture sheet 31, the blocking force of the abdominal wall to the protective shell 32 disappears, and the protective shell 32 returns to the initial state under the action of the self elasticity, that is, the lower shell 322 of the protective shell 32 covers the puncture tip 311 of the puncture sheet 31 again.

In the embodiment, the puncture body assembly 3 is adopted to replace the traditional puncture core rod to realize the puncture function, and compared with the traditional puncture device, the puncture device has simpler structure and lower cost. Meanwhile, the puncture body assembly 3 is directly arranged on the tube wall of the cannula assembly 1 and does not need to be inserted through the sealing assembly 2, so that the sealing performance of the sealing assembly 2 is not affected by the puncture body assembly 3 in the embodiment, the puncture body assembly 3 does not need to be disassembled to be packaged with the cannula assembly 1, the packaging space and the packaging cost of a single puncture device are saved, and the coreless puncture device in the embodiment has great economic benefit.

In addition, the protective casing 32 of the coreless puncture outfit of the present embodiment can rapidly change between the initial state and the puncture state under the action of elastic force, so that even though some doctors with insufficient experience use the coreless puncture outfit of the present embodiment, the damage to the patient caused by downward inertia force when the puncture tip 311 enters the abdominal cavity or the rotation of the puncture outfit during the operation process can be effectively avoided. Therefore, the coreless puncture instrument in the present embodiment has higher safety operability.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A coreless puncture instrument is characterized by comprising a cannula assembly and a puncture body assembly, wherein at least one part of the puncture body assembly is fixedly connected with the cannula assembly, the puncture body assembly comprises a puncture component and a protective shell, the puncture component comprises a puncture tip, the protective shell is made of elastic materials, and in an initial state, the protective shell covers the puncture tip; the protective shell can be elastically deformed or restored to an original state to allow the puncture tip to be exposed from the bottom of the protective shell or to be covered by the protective shell.

2. The coreless puncture instrument of claim 1, wherein the cannula assembly includes a first end and a second end, the second end of the cannula assembly is fixedly provided with a puncture body assembly, the puncture tip of the puncture assembly protrudes from an end face of the second end of the cannula assembly, the protective housing includes an upper housing and a lower housing, the upper housing is fixedly connected to the cannula assembly directly or indirectly, and the lower housing covers the puncture tip of the puncture assembly.

3. The coreless puncture instrument of claim 2, wherein the puncture body assembly further includes an annular sleeve, the puncture member is fixedly disposed on an inner wall of the annular sleeve, a puncture tip of the puncture member protrudes from a bottom edge of the annular sleeve, the protective housing is disposed on an outer wall of the annular sleeve and is positioned to correspond to the puncture member, and the annular sleeve is mounted on the second end of the cannula assembly.

4. The coreless puncture instrument according to claim 3, wherein the annular sleeve is provided with an assembly hole, and the puncture member is provided with a positioning block which is embedded in the assembly hole.

5. The coreless puncture instrument according to claim 3, wherein the protective shell is connected to the annular sleeve by any one of adhesion, welding, riveting or clamping.

6. The coreless piercer of claim 3, wherein the sleeve assembly includes an upper sleeve and a lower sleeve, central axes of the upper sleeve and the lower sleeve being axially aligned, an outer diameter of the lower sleeve being smaller than an outer diameter of the upper sleeve, a connection portion of the upper sleeve and the lower sleeve forming a stepped surface,

7. The coreless piercer of claim 6, wherein an outer diameter of the annular sleeve is the same as an outer diameter of the upper cannula.

8. The coreless piercer of claim 6, wherein a plurality of protrusions are distributed on the stepped surface,

9. The coreless piercer of claim 3, wherein the annular sleeve is circumferentially divided into a first side and a second side, a bottom of the second side being higher than a bottom of the first side, the piercing member and the protective sheath being disposed correspondingly on the first side of the annular sleeve.

10. The coreless puncture instrument of claim 6, wherein the lower cannula has a notch formed in a first side of the annular sleeve, and an upper portion of the puncture element is disposed to fit into the notch.

11. The coreless piercer of claim 9, wherein the first side and the second side of the annular sleeve are connected by a transition surface that extends from the first side to the second side and that includes, in order, a first circular arc surface and a second circular arc surface, the first circular arc surface having a radius that is greater than a radius of the second circular arc surface.

12. The coreless piercer of claim 11, wherein the transition surface further comprises a third arc surface, and wherein the curved surface of the first arc surface, the curved surface of the second arc surface, and the curved surface of the third arc surface form a reverse curve.