Ophthalmic puncture device

Abstract

Provided is an ophthalmic puncture device, comprising: a handle; a puncture tip, arranged at one end of the handle; a protection sleeve, arranged in the handle and movable between a first position and a second position in an axial direction of the handle, wherein when the protection sleeve is located at the first position, the puncture tip is located in the protection sleeve, and when the protection sleeve is located at the second position, the puncture tip is exposed out of the protection sleeve; a slider, connected to the protection sleeve and movable in the axial direction of the handle to drive the protection sleeve; and a puncture sleeve, detachably sheathing the puncture tip, wherein the protection sleeve cooperates with the puncture sleeve to push the puncture tip out of the puncture sleeve when the protection sleeve moves from the second position to the first position.

Description

Ophthalmic puncture device Technical Field

[0001] The present invention relates to the technical field of ophthalmic surgery, and more particularly to an ophthalmic puncture device. Background Art

[0002] During ophthalmic microsurgery, surgeons may need to insert and remove surgical instruments multiple times, or insert and remove multiple surgical instruments. If the surgical instruments directly contact the incision site, the insertion, manipulation, and removal of the surgical instruments may cause trauma to the eye. To facilitate easy insertion and removal of surgical instruments, reduce the possibility of trauma at the incision site, and promote healing, surgeons may insert one or more puncture cannulas into the eye, each of which serves as an entryway or port for surgical instruments to enter the eye.

[0003] During fundus surgery, it is generally necessary to first insert the above-mentioned puncture cannula on the surface of the eyeball. Before puncture, it is necessary to use a ruler to properly mark the puncture position, and then perform the puncture. After the puncture is completed, the puncture knife is withdrawn and the puncture cannula is left on the surface of the eyeball to form a channel for the operation of surgical instruments.

[0004] Currently, after the puncture is completed, forceps are needed to assist in clamping the puncture cannula to withdraw the surgical instrument. This process requires the cooperation of both hands or multiple people, which not only affects the operation efficiency but also increases the risk of the operation.

[0005] Summary of the Invention

[0006] The present invention provides a new technical solution for an ophthalmic puncture device, which can at least solve the problems of low assembly efficiency of puncture sleeves and high surgical risks in the prior art.

[0007] According to an embodiment of the present invention, an ophthalmic puncture device includes: a handle; a puncture blade head, which is arranged at one end of the handle; a protective sleeve, which is arranged in the handle and is movable between a first position and a second position along the axial direction of the handle, when the protective sleeve is in the first position, the puncture blade head is located in the protective sleeve, and when the protective sleeve is in the second position, the puncture blade head is exposed outside the protective sleeve; a sliding key, which is connected to the protective sleeve and is movable along the axial direction of the handle to drive the protective sleeve; a puncture sleeve, which is detachably sleeved on the puncture blade head, and the protective sleeve cooperates with the puncture sleeve to push the puncture sleeve out of the puncture blade head when the protective sleeve moves from the second position to the first position.

[0008] Optionally, the protective sleeve includes: a sleeve, which is movable along the axial direction of the handle, one end of the sleeve is provided with the mounting groove, and a part of the sliding key is connected to the mounting groove; a limit member, the limit member is provided on the sleeve, and the limit member abuts against the puncture sleeve when the protective sleeve is in the second position.

[0009] Optionally, the limiting component includes: a connecting portion, which is connected to the sleeve; a limiting portion, which is movable relative to the connecting portion between a retracted state and an expanded state, and when the limiting portion is in the retracted state, the limiting portion avoids the puncture sleeve, and the protective sleeve is movable from the first position to the second position, and when the limiting portion is in the expanded state, the limiting portion is located on the movable path of the puncture sleeve, and the limiting portion disengages from the puncture sleeve or stops at the puncture sleeve.

[0010] Optionally, the connecting portion is formed as an annular structure extending along the circumference of the sleeve, and the limiting portion is provided on the inner circumference of the connecting portion and extends along the circumference of the connecting portion.

[0011] Optionally, the limiting portion is formed as an elastic body provided on the connecting portion, and the limiting portion is deformable to switch between the stored state and the expanded state.

[0012] Optionally, the limiting portion is formed as an elastic body extending obliquely relative to the axis of the puncture sleeve, and in the direction of the protective sleeve from the first position to the second position, the limiting portion gradually moves away from the axis of the puncture sleeve.

[0013] Optionally, the connecting portion includes: a main body portion, which is connected to the sleeve; a first bending portion, which is formed into a C-shaped structure, and the first end of the first bending portion is connected to the main body portion; a second bending portion, which is formed into a C-shaped structure with an opening direction opposite to the opening direction of the first bending portion, and the first end of the second bending portion is connected to the second end of the first bending portion, and the limiting portion is connected to the second end of the second bending portion.

[0014] Optionally, a positioning groove is provided at the end of the sleeve, and the main body and the first bending portion are provided in the positioning groove.

[0015] Optionally, the limiting member is an integrally formed metal sheet or metal wire.

[0016] Optionally, the handle is provided with a guide groove extending along its axial direction, the sliding key is movably provided in the guide groove, and a part of the sliding key passes through the guide groove and is connected to the protective sleeve.

[0017] According to the ophthalmic puncture device of an embodiment of the present invention, a movable protective sleeve is provided in the handle. The protective sleeve can push the puncture sleeve to separate from the puncture blade head during the movement from the second position to the first position. There is no need to use tweezers to assist in clamping. The puncture sleeve can be separated with one hand, thereby realizing the withdrawal of the puncture blade head, effectively improving the surgical efficiency. In addition, the withdrawal of the puncture cannula with the puncture blade head with one hand can reduce surgical risks and improve safety.

[0018] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0020] FIG1 is a schematic structural diagram of an ophthalmic puncturing device according to one embodiment of the present invention;

[0021] FIG2 is a side view of an ophthalmic puncturing device according to one embodiment of the present invention;

[0022] FIG3 is a partial cross-sectional view of an ophthalmic puncturing device according to one embodiment of the present invention;

[0023] FIG4 is a schematic diagram of a state of a limiting portion of an ophthalmic puncturing device according to an embodiment of the present invention;

[0024] FIG5 is a schematic diagram of another state of the limiting portion of the ophthalmic puncturing device according to one embodiment of the present invention;

[0025] FIG6 is a schematic diagram of another state of the limiting portion of the ophthalmic puncturing device according to an embodiment of the present invention.

[0026] Reference numerals: ophthalmic puncturing device 100; handle 10; guide groove 11; puncturing blade 20; protective sleeve 30; sleeve 31; mounting groove 311; positioning groove 312; stopper 32; connecting portion 321; main body 3211; first bending portion 3212; second bending portion 3213; stopper 322; sliding key 40; puncturing sleeve 50. DETAILED DESCRIPTION

[0027] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0028] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0029] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0030] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0031] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0032] The ophthalmic puncturing device 100 according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] As shown in FIG. 1 to FIG. 6 , an ophthalmic puncturing device 100 according to an embodiment of the present invention includes a handle 10 , a puncturing blade 20 , a protective sleeve 30 , a sliding key 40 and a puncturing sleeve 50 .

[0034] Specifically, the puncture head 20 is provided at one end of the handle 10, and the protective sleeve 30 is provided in the handle 10. The protective sleeve 30 is movable between a first position and a second position along the axial direction of the handle 10. When the protective sleeve 30 is in the first position, the puncture head 20 is located in the protective sleeve 30. When the protective sleeve 30 is in the second position, the puncture head 20 is exposed outside the protective sleeve 30. The sliding key 40 is connected to the protective sleeve 30. The sliding key 40 is movable along the axial direction of the handle 10 to drive the protective sleeve 30. The puncture sleeve 50 is detachably sleeved on the puncture head 20. The protective sleeve 30 cooperates with the puncture sleeve 50 to push the puncture sleeve 50 out of the puncture head 20 when the protective sleeve 30 moves from the second position to the first position.

[0035] In other words, the ophthalmic puncture device 100 according to an embodiment of the present invention can be used for ophthalmic surgery. The ophthalmic puncture device 100 can push the puncture cannula 50 from the puncture blade head 20, thereby inserting the puncture cannula 50 into the surface of the eyeball. The ophthalmic puncture device 100 according to an embodiment of the present invention is mainly composed of a handle 10, a puncture blade head 20, a protective sleeve 30, a sliding key 40, and a puncture cannula 50. Among them, the handle 10 constitutes the main structure of the ophthalmic puncture device 100, and the remaining components can be directly or indirectly arranged on the handle 10. The handle 10 is designed to be a structure suitable for the user to hold, such as a columnar structure, so that the user can operate and use the ophthalmic puncture device 100.

[0036] The puncture blade 20 is provided at one end of the handle. The puncture blade 20 can be used to puncture the eyeball. The shape and structure of the puncture blade 20 can be reasonably adjusted according to the specific surgical needs. The protective sleeve 30 is provided inside the handle 10. The protective sleeve 30 can be movable between a first position and a second position. When the protective sleeve 30 is in the first position, one end of the protective sleeve 30 extends out of the handle 10 and can completely cover the puncture blade 20, avoiding the risk of the puncture blade 20 being exposed. When the protective sleeve 30 is in the second position, one end of the protective sleeve 30 can be retracted into the handle 10, and the puncture blade 20 is exposed outside the handle 10 and the protective sleeve 30. At this time, surgery can be performed through the puncture blade 20.

[0037] The sliding key 40 can be movably arranged on the handle 10, a part of the sliding key 40 is exposed on the outer surface of the handle 10 or is constructed into a structure that is convenient for the user to push and pull, and the other part of the sliding key 40 can be connected to the protective sleeve 30, so that the protective sleeve 30 can be driven to move between the first position and the second position by sliding the sliding key 40.

[0038] When the ophthalmic puncture device 100 according to an embodiment of the present invention is not in use, the protective sleeve 30 can be located at the first position or near the first position, the puncture head 20 is located in the protective sleeve 30, the puncture sleeve 50 can be pre-mounted on the puncture head 20, the length of the puncture sleeve 50 can be smaller than the length of the puncture head 20, and the tip of the puncture head 20 can be exposed outside the puncture sleeve 50.

[0039] When the ophthalmic puncture device 100 is needed, the sliding key 40 can be pushed to move the protective sleeve 30 from the first position to the second position. When the tip of the puncture head 20 is exposed outside the protective sleeve 30, the operation can be performed normally through the puncture head 20.

[0040] When the puncture cannula 50 needs to be pushed out of the puncture head 20, the protective cannula 30 can be moved to the second position by pushing the sliding key 40. When the protective cannula 30 is in the second position, a part of the protective cannula 30 can cooperate with the puncture cannula 50, for example, the puncture cannula 50 can be clamped or the protective cannula 50 can be stopped. Then, the protective cannula 30 is pushed from the second position to the first position by the sliding key 40. During the movement of the protective cannula 30, the puncture cannula 50 can be driven to move synchronously, thereby pushing the puncture cannula 50 out of the puncture head 20. The pushed-out puncture cannula 50 can be placed on the surface of the eyeball or other surfaces where the puncture cannula 50 needs to be reserved.

[0041] Therefore, according to the ophthalmic puncture device 100 of the embodiment of the present invention, a movable protective sleeve 30 is provided in the handle 10. Driven by the sliding key 40, the protective sleeve 30 can push the puncture sleeve 50 to separate from the puncture blade head 20 during the movement from the second position to the first position. There is no need to use tweezers to assist in clamping. The puncture sleeve 50 can be separated by a single-handed operation, thereby realizing the withdrawal of the puncture blade head 20, effectively improving the surgical efficiency. In addition, the withdrawal of the puncture sleeve 50 by the puncture blade head 20 by a single-handed operation can reduce surgical risks and improve safety.

[0042] According to one embodiment of the present invention, the protective sleeve 30 includes: a sleeve 31 and a limiting member 32 .

[0043] Specifically, the sleeve 31 is movable along the axial direction of the handle 10, and a mounting groove 311 is provided at one end of the sleeve 31. A portion of the sliding key 40 is connected to the mounting groove 311. The limiter 32 is provided on the sleeve 31, and the limiter 32 abuts against the puncture sleeve 50 when the protective sleeve 30 is in the second position.

[0044] In other words, as shown in FIG3 , the protective sleeve 30 is primarily composed of a sleeve 31 and a stopper 32 . The sleeve 31 constitutes the main structure of the protective sleeve 30 and is disposed within the handle 10 . Specifically, the sleeve 31 may be formed as a columnar structure corresponding to the shape of the handle 10 . One end of the sleeve 31 may extend or retract within the handle 10 , thereby protecting or exposing the puncture tip 20 . A mounting slot 311 is provided at the other end of the sleeve 31 . A portion of the sliding key 40 extends into the handle 10 and connects to the mounting slot 311 , thereby achieving synchronized movement of the sliding key 40 and the protective sleeve 30 .

[0045] The limiting member 32 is arranged at one end of the sleeve 31 close to the puncture head 20. The limiting member 32 and the sleeve 31 can move synchronously, and when the protective sleeve 30 moves to the second position, the limiting member 32 can abut against the puncture sleeve 50. After the limiting member 32 abuts against the puncture sleeve 50, the sliding key 40 is pushed to make the protective sleeve 30 move from the second position to the first position. The limiting member 32 can push the puncture sleeve 50 to move synchronously, thereby pushing the puncture sleeve 50 out of the puncture head 20.

[0046] Therefore, according to the ophthalmic puncture device 100 of the embodiment of the present invention, by providing a limit member 32 on the sleeve 31, the limit member 32 can abut against the puncture sleeve 50 when the puncture sleeve 30 is in the second position, so that the puncture sleeve 50 can be pushed out from the puncture head 20 when the protective sleeve 30 moves from the second position to the first position. This structure is simple, feasible and easy to operate.

[0047] In some specific embodiments of the present invention, the limiting member 32 includes a connecting portion 321 and a limiting portion 322 .

[0048] Among them, the connecting part 321 is connected to the sleeve 31, and the limiting part 322 is movable relative to the connecting part 321 between the storage state and the deployment state. When the limiting part 322 is in the storage state, the limiting part 322 avoids the puncture sleeve 50, and the protective sleeve 30 is movable from the first position to the second position. When the limiting part 322 is in the deployment state, the limiting part 322 is located on the movable path of the puncture sleeve 50, and the limiting part 322 is separated from the puncture sleeve 50 or stops at the puncture sleeve 50.

[0049] Specifically, as shown in Figures 3 to 6, the limiting member 32 according to the embodiment of the present invention is mainly composed of two parts: a connecting portion 321 and a limiting portion 322. The connecting portion 321 mainly serves to assemble the limiting member 32 to the sleeve 31. The connecting portion 321 can be fixedly connected to the sleeve 31, or can be detachably connected to the sleeve 31 as needed.

[0050] The limiting portion 322 is movably connected to the connecting portion 321, and the limiting portion 322 can switch between a retracted state and an expanded state. When the limiting portion 322 is in the retracted state, as shown in FIG5 , a portion of the limiting portion 322 is retracted to form a space for the puncture sleeve 50 to pass through. At this time, the limiting portion 322 can move relative to the puncture sleeve 50, thereby not affecting the movement of the limiting portion 322 from the first position to the second position. A portion of the limiting portion 322 is retracted, and the movement of the limiting portion 322 can be controlled by an external structure, or the limiting portion 322 can be squeezed by the puncture sleeve 50 during the movement of the protective sleeve 30 from the first position to the second position, thereby deforming the limiting portion 322.

[0051] When the limiting portion 322 is in the expanded state, a part of the limiting portion 322 is expanded. When the limiting portion 322 is in the expanded state, the protective sleeve 30 can be in the first position or the second position. When the puncture sleeve 50 is in the first position, as shown in Figure 4, the puncture sleeve 50 and the puncture head 20 are both located inside the protective sleeve, and the limiting portion 322 can be in a free state without contacting the puncture sleeve 50. When the puncture sleeve 50 is in the second position, as shown in Figure 6, a part of the limiting portion 322 can stop the puncture sleeve 50, and when the puncture sleeve 50 moves from the second position to the first position, the limiting portion 322 can drive the puncture sleeve 50 to move together, thereby pushing the puncture sleeve 50 out of the puncture head 20.

[0052] Thus, by providing a retractable and deployable stopper 322 on the stopper 32, the stopper 322 can avoid the puncture cannula 50 when the protective sleeve 30 moves from the first position to the second position, without affecting the normal movement of the protective sleeve 30. Furthermore, when the protective sleeve 30 moves to the second position, it abuts against the puncture cannula 50, thereby pushing the puncture cannula 50 away from the puncture blade head 20 when the protective sleeve 30 moves from the second position to the first position. The stopper 32 has a simple structure, is easy to assemble and operate, and can easily push the puncture cannula 50 out with one hand, greatly improving surgical efficiency and reducing surgical risks.

[0053] According to one embodiment of the present invention, the connecting portion 321 is formed as an annular structure extending along the circumference of the sleeve 31 , and the limiting portion 322 is provided on the inner circumference of the connecting portion 321 and extends along the circumference of the connecting portion 321 .

[0054] In other words, the limiting member 32 is formed as a whole into an annular structure, the connecting portion 321 of the limiting member 32 extends along the circumference of the sleeve 31, and the limiting portion 322 is provided around the connecting portion 321. It is understood that the connecting portion 321 and the limiting portion 322 can also be provided in a plurality, and the plurality of limiting portions 322 are distributed along the circumference of the sleeve 31 at intervals.

[0055] Therefore, by setting the connecting part 321 and the limiting part 322 of this structure, it is possible to ensure the connection stability between the limiting part 32 and the sleeve 31, and to ensure that the limiting part 322 can normally push the puncture sleeve 50 to detach from the puncture head 20 when the sleeve 31 moves, thereby further improving the product stability and safety.

[0056] In some specific embodiments of the present invention, the limiting portion 322 is formed as an elastic body provided on the connecting portion 321 , and the limiting portion 322 is deformable to switch between the stored state and the deployed state.

[0057] Optionally, the limiting portion 322 is formed as an elastic body extending obliquely relative to the axis of the puncture sleeve 50, and in the direction from the first position to the second position of the protective sleeve 30, the limiting portion 322 gradually moves away from the axis of the puncture sleeve 50.

[0058] Specifically, as shown in Figures 4 to 6, the limiting portion 322 can be formed as an elastic structure, and the elastic structure extends obliquely relative to the axis of the puncture sleeve 50. This structural design ensures that when the protective sleeve 30 is in the first position, the limiting portion 322 is in a naturally expanded state due to its elastic force. When the protective sleeve 30 moves from the first position to the second position, the limiting portion 322 can be squeezed by the puncture sleeve 50 and move from the expanded state to the retracted state. After the protective sleeve 30 moves to the second position, the limiting portion 322 can automatically expand. When the protective sleeve 30 moves from the second position to the first position, the limiting portion 322 can push the puncture sleeve 50, thereby separating the puncture sleeve 50 from the puncture blade head 20.

[0059] Therefore, by designing the limiting portion 322 as an elastic structure, the operation of the ophthalmic puncturing device 100 can be further simplified, thereby further improving the surgical efficiency.

[0060] According to one embodiment of the present invention, the connecting portion 321 includes a main body portion 3211 , a first bending portion 3212 and a second bending portion 3213 .

[0061] Specifically, the main body 3211 is connected to the sleeve 31, the first bending portion 3212 is formed into a C-shaped structure, the first end of the first bending portion 3212 is connected to the main body 3211, the second bending portion 3213 is formed into a C-shaped structure with an opening direction opposite to the opening direction of the first bending portion 3212, the first end of the second bending portion 3213 is connected to the second end of the first bending portion 3212, and the limiting portion 322 is connected to the second end of the second bending portion 3213.

[0062] In other words, as shown in Figure 4, the connecting portion 321 can be composed of three parts: a main body 3211, a first bending portion 3212 and a second bending portion 3213. The main body 3211, the first bending portion 3212 and the second bending portion 3213 are connected in sequence. The main body 3211 can fix the limiting member 32 to the sleeve 31 as a whole. The first bending portion 3212 and the second bending portion 3213 are respectively formed into a C-shaped structure, that is, the first bending portion 3212 and the second bending portion 3213 can be connected to each other to form an S-shaped structure, and the limiting portion 322 is arranged at the end of the second bending portion 3213.

[0063] Therefore, the connecting portion 321 of this structure can not only ensure the connection stability between the limiting portion 322 and the connecting portion 321, but also make the limiting portion 322 have excellent elasticity, thereby enabling free switching between the stored state and the unfolded state.

[0064] Optionally, in some specific embodiments of the present invention, a positioning groove 312 is provided at the end of the sleeve 31 , and the main body 3211 and the first bending portion 3212 are provided in the positioning groove 312 .

[0065] Specifically, as shown in FIG3 , a positioning groove 312 is provided at one end of the sleeve 31 near the puncture blade head 20. The main body 3211 and the first bent portion 3212 of the stopper 32 are disposed in the positioning groove 312, thereby enabling the stopper 32 to be assembled on the sleeve 31. This assembly structure can effectively ensure the assembly stability of the stopper 32 and the sleeve 31.

[0066] According to one embodiment of the present invention, the limiting member 32 is an integrally formed metal sheet or metal wire.

[0067] That is, the connection portion 321 and the limiting portion 322 of the limiting member 32 can be integrally formed, and the connection portion 321 and the limiting portion 322 can be made of elastic metal wire or elastic metal sheet. The limiting member 32 of this structure is not only easy to prepare but also low in cost and suitable for widespread use.

[0068] In some specific embodiments of the present invention, the handle 10 is provided with a guide groove 11 extending along its axial direction, the sliding key 40 is movably provided in the guide groove 11 , and a portion of the sliding key 40 passes through the guide groove 11 and is connected to the protective sleeve 30 .

[0069] Specifically, as shown in Figure 1, the outer wall surface of the handle 10 is provided with a guide groove 11 connected to the interior of the handle 10, and the sliding key 40 is movably provided in the guide groove 11. A part of the sliding key 40 passes through the guide groove 11 and is connected to the protective sleeve 30, thereby driving the protective sleeve 30 to move synchronously. The other part of the sliding key 40 can be exposed from the handle 10, or it can be formed into a structure suitable for manual operation by the user, so that the user can push the sliding key 40 with one hand, which can drive the protective sleeve 30 to move, thereby achieving the effect of pushing out the puncture sleeve 50 with one hand.

[0070] Therefore, by setting a sliding key 40 on the handle 10, the puncture cannula 50 can be pushed out from the puncture head 20 by operating the sliding key 40 with one hand, which further simplifies the operation method, improves the surgical efficiency of the ophthalmic puncture device 100, and reduces the surgical risk.

[0071] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An ophthalmic puncture device, characterized in that, Comprising: A handle; A puncture blade head, which is provided at one end of the handle; A protective sleeve, which is provided in the handle. The protective sleeve is axially movable along the handle between a first position and a second position. When the protective sleeve is in the first position, the puncture blade head is located within the protective sleeve. When the protective sleeve is in the second position, the puncture blade head is exposed outside the protective sleeve; A sliding key, which is connected to the protective sleeve. The sliding key is axially movable along the handle to drive the protective sleeve; A puncture sleeve, which is detachably sleeved on the puncture blade head. The protective sleeve cooperates with the puncture sleeve to push the puncture sleeve out of the puncture blade head when the protective sleeve moves from the second position to the first position.

2. The ophthalmic puncture device according to claim 1, wherein, The protective sleeve includes: A sleeve, which is axially movable along the handle. An installation groove is provided at one end of the sleeve, and a part of the sliding key is connected to the installation groove; A limiting member, which is provided on the sleeve. The limiting member abuts against the puncture sleeve when the protective sleeve is in the second position.

3. The ophthalmic puncture device according to claim 2, wherein, The limiting member includes: A connecting portion, which is connected to the sleeve; A limiting portion, which is movable between a retracted state and an extended state relative to the connecting portion. When the limiting portion is in the retracted state, the limiting portion avoids the puncture sleeve. The protective sleeve can move from the first position to the second position. When the limiting portion is in the extended state, the limiting portion is on the moving path of the puncture sleeve, and the limiting portion disengages from or abuts against the puncture sleeve.

4. The ophthalmic puncture device according to claim 3, wherein, The connecting portion is formed as an annular structure extending along the circumferential direction of the sleeve, and the limiting portion is provided on the inner circumference of the connecting portion extending along the circumferential direction of the connecting portion.

5. The ophthalmic puncture device according to claim 3, wherein, The limiting portion is formed as an elastic body provided on the connecting portion, and the limiting portion can be deformed to switch between the retracted state and the extended state.

6. The ophthalmic puncture device according to claim 5, wherein, The limiting portion is formed as an elastic body extending obliquely relative to the axis of the puncture sleeve, and in the direction of the protective sleeve moving from the first position to the second position, the limiting portion gradually moves away from the axis of the puncture sleeve.

7. The ophthalmic puncture device according to claim 3, wherein, The connecting portion includes: A main body portion, which is connected to the sleeve; A first bending portion, which is formed as a C-shaped structure. The first end of the first bending portion is connected to the main body portion; A second bending portion, which is formed as a C-shaped structure with an opening direction opposite to that of the first bending portion. The first end of the second bending portion is connected to the second end of the first bending portion, and the limiting portion is connected to the second end of the second bending portion.

8. The ophthalmic puncture device according to claim 7, characterized in that, A positioning groove is provided at the end of the sleeve, and the main body portion and the first bending portion are provided in the positioning groove.

9. The ophthalmic puncture device according to claim 7, wherein, The limiting member is an integrally formed metal sheet or metal wire.

10. The ophthalmic puncture device according to claim 1, characterized in that, The handle is provided with a guiding groove extending along its axis. The sliding key is movably provided in the guiding groove, and a part of the sliding key passes through the guiding groove and is connected to the protective sleeve.

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