Puncture outfit for ophthalmology department

Abstract

The invention discloses an ophthalmology puncture outfit which comprises a puncture needle, a puncture cannula, a handle and a self-closing valve, the puncture needle is fixedly connected with the front end of the handle, the puncture cannula is detachably connected with the self-closing valve, and the puncture cannula is movably arranged on the puncture needle in a sleeving and penetrating mode and movably connected with the front end of the handle. The puncture cannula comprises a cannula body and a cannula head, and at least one groove is formed in the side face of the cannula head. At least one boss extending to the groove is arranged on the side face of the front end of the handle. The boss and the groove interact with each other, on one hand, the puncture cannula is prevented from being easily separated from the handle, and on the other hand, when the puncture cannula is inserted into the eye, the puncture cannula is prevented from rotating relative to the handle.

Description

Technical Field

[0001] This invention relates to ophthalmic surgical instruments, and more specifically, to an ophthalmic puncture device. Background Technology

[0002] In microsurgical ophthalmology, an ophthalmic trocar is used to facilitate the entry of intraocular instruments. This trocar creates a channel in the flat part of the sclera, allowing instruments to enter the eye for various surgical procedures while avoiding direct contact between the instruments and the surgical wound. Existing ophthalmic trocars typically consist of a puncture needle, a puncture cannula, and a handle. The puncture needle is attached to the handle and used to puncture the sclera to create an incision. The puncture cannula is pre-attached to the puncture needle and inserted into the scleral incision along with the needle. The needle is then withdrawn, leaving the puncture cannula in place at the scleral incision as the pathway for the instrument into the eye.

[0003] Since the puncture cannula is pre-attached to the puncture needle and inserted into the scleral incision along with the needle, and then left in the scleral incision after the needle is removed, the puncture cannula and the puncture needle must be designed to be flexible. This results in: (1) the puncture cannula easily falling off the puncture needle naturally; (2) during the insertion of the puncture cannula into the scleral incision, relative rotation between the puncture cannula and the puncture needle is likely to occur, making it difficult for the puncture cannula to enter the incision smoothly.

[0004] Furthermore, the puncture cannula, serving as a passage for intraocular instruments to enter and exit the eye, is completely open when no instruments are inserted. Due to intraocular pressure, intraocular fluid continuously leaks from the puncture cannula, affecting the stability of intraocular pressure. Therefore, a plug is needed to block the puncture cannula when no instruments are inserted. Obviously, this plug-based solution cannot prevent intraocular fluid from leaking from the puncture cannula in a timely manner, and its operation is quite cumbersome. Therefore, an ophthalmic puncture device with a self-closing valve has been proposed in the market. The self-closing valve is usually made of a soft, elastic material and is detachably pre-installed on the puncture cannula. This self-closing valve allows intraocular instruments to enter the puncture cannula through the valve and closes naturally when no instruments are inserted. However, the existing self-closing valves have poor sealing performance. Even when the valve is closed, intraocular fluid continues to slowly leak out, which is especially noticeable when intraocular pressure is high. It is difficult to maintain stable intraocular pressure during surgery. Moreover, once the valve is opened, it is difficult for it to automatically return to the closed state. When the instrument enters or exits the puncture cannula, intraocular fluid will gush out from the valve, causing a sudden drop in intraocular pressure, which adversely affects the safety of the surgery. Summary of the Invention

[0005] This invention provides an ophthalmic puncture device, the primary objective of which is to solve the problems of the puncture cannula easily detaching from the handle and the relative rotation between the puncture cannula and the handle when the puncture cannula is inserted into the eye. A secondary objective is to address the problem of poor sealing performance of the self-closing valve.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: an ophthalmic puncture device, comprising a puncture needle, a puncture cannula, a handle, and a self-closing valve, wherein the puncture needle is fixedly connected to the front end of the handle, the puncture cannula is detachably connected to the self-closing valve, the puncture cannula is movably sleeved on the puncture needle, and is movably connected to the front end of the handle.

[0007] Furthermore, the puncture cannula includes a cannula body and a cannula head, with at least one groove on the side of the cannula head; and at least one protrusion extending into the groove is provided on the side of the front end of the handle. The protrusion and the groove interact to prevent the puncture cannula from easily detaching from the handle, and to prevent relative rotation between the puncture cannula and the handle when the puncture cannula is inserted into the eye.

[0008] Furthermore, the self-closing valve has a normally closed slit, through which intraocular instruments can easily enter the puncture cannula; and when no instruments are inserted, the slit can close naturally to prevent fluid from passing through.

[0009] Furthermore, the cannula head includes a base, a neck, and a top; the outer diameter of the neck is smaller than the outer diameter of the top, and the outer diameter of the top is smaller than the outer diameter of the base; the self-closing valve is detachably fitted onto the top. The base is intended to contact the sclera of the eyeball, keeping the puncture cannula head outside the eye; the neck facilitates clamping of the puncture cannula head with tools such as forceps, and the top is used to install the self-closing valve.

[0010] Furthermore, the cannula body includes a tube and a guide portion; the diameter of the guide portion is larger than the diameter of the tube; the guide portion of the cannula body is fixedly fitted inside the cannula head. The tube is intended to be inserted into the eye through the scleral incision, and its diameter is slightly larger than that of the puncture needle; the diameter of the guide portion is larger than that of the tube, facilitating instrument entry and guiding the instrument smoothly through the tube into the eye.

[0011] Furthermore, the self-closing valve has a concave arc surface in its center, and the slit is located within this arc surface, extending from its outer surface to its inner surface; the extension direction of the slit forms an angle with the perpendicular direction of the arc surface. When an intraocular instrument enters the eye through the puncture cannula, the instrument's tip applies radial pressure from the outside to the inside to the concave arc surface of the self-closing valve. Due to the design of the concave arc surface, the slit on the concave arc surface easily opens, facilitating instrument passage. When the intraocular instrument withdraws from the eye through the puncture cannula, due to the presence of intraocular pressure, the concave arc surface bears pressure from the inside to the outside. Due to the design of the concave arc surface, the slit on the concave arc surface easily closes. Due to the angled design of the slit, when the slit closes naturally, the edges on both sides of the slit overlap, forming a flap-like structure, which improves the sealing performance of the self-closing valve, prevents intraocular fluid leakage, and maintains stable intraocular pressure.

[0012] Furthermore, the inner wall of the guide portion of the cannula body is provided with a protrusion, and the end of the cannula body is provided with a chamfer. The protrusion increases the stability of the connection between the cannula and certain instruments (such as ophthalmic irrigation cannulas). These instruments are intended to be inserted into the cannula and have corresponding structures that cooperate with the protrusion, making the connection more stable and less prone to loosening. The chamfer reduces the resistance when the puncture cannula is inserted into the scleral incision, making it easier to insert and avoiding secondary damage to the incision.

[0013] Furthermore, the puncture needle has five cutting edges at its tip, four of which are symmetrically arranged, and the fifth cutting edge is located at the end of the needle tip. The symmetrical arrangement of the four cutting edges allows the needle tip to pierce the sclera of the eyeball, forming a linear incision. On the one hand, the linear incision provides better gripping ability for the puncture cannula, making the cannula more stable when placed in the scleral incision; on the other hand, the linear incision can close naturally after surgery, usually without the need for sutures. The fifth cutting edge is located at the end of the needle tip to prevent the tip from being too sharp and lacking strength, preventing chipping or breakage during puncture, and ensuring the sharpness of the needle tip.

[0014] Furthermore, the handle has 3mm and 4mm markings at its end. These markings allow for accurate measurement of the puncture point on the scleral flat, thus avoiding damage to critical retinal tissue caused by incorrect puncture placement.

[0015] Furthermore, it also includes a protective cap fitted onto the front end of the handle. The protective cap is used to protect the puncture needle and the puncture cannula.

[0016] Compared with the prior art, the protrusion on the handle and the groove on the puncture cannula of the present invention interact to prevent the puncture cannula from easily detaching from the handle, and to prevent relative rotation between the puncture cannula and the handle when the puncture cannula is inserted into the eye. The self-closing valve of the present invention allows intraocular instruments to easily enter the puncture cannula through the self-closing valve; and when no instruments are inserted, the self-closing valve can naturally close to prevent intraocular fluid leakage, thereby maintaining stable intraocular pressure. Attached Figure Description

[0017] The structure of the present invention and its beneficial technical effects will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention (without a protective cap).

[0019] Figure 2 This is a structural schematic diagram of the present invention (with a protective cap).

[0020] Figure 3 yes Figure 1 A-enlarged view.

[0021] Figure 4 This is a schematic diagram of the separation of the puncture cannula and puncture needle of the present invention.

[0022] Figure 5 This is a schematic diagram of the puncture cannula structure of the present invention.

[0023] Figure 6 yes Figure 5 AA cross-section view.

[0024] Figure 7 This is a schematic diagram of the sleeve head structure of the present invention.

[0025] Figure 8 This is a schematic diagram of the self-closing valve structure of the present invention.

[0026] Figure 9 This is a top view of the self-closing valve of the present invention.

[0027] Figure 10 yes Figure 9 AA cross-section view.

[0028] Figure 11 This is a schematic diagram of the puncture needle of the present invention.

[0029] Figure 12 yes Figure 11 Enlarged view of A.

[0030] Figure 13 This is a schematic diagram of the assembly of the puncture cannula and the self-closing valve of the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are merely for explaining the invention and are not intended to limit the invention.

[0032] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 13 The ophthalmic puncture device of this embodiment includes a protective cap 1, a puncture needle 2, a puncture cannula 3, a handle 4, and a self-closing valve 5. The puncture needle 2 is fixedly connected to the front end of the handle 4, and the puncture cannula 3 is detachably connected to the self-closing valve 5. The puncture cannula 3 is movably fitted onto the puncture needle 2 and movably connected to the front end of the handle 4. The protective cap 1 is fitted onto the front end of the handle 4, and 3mm and 4mm markings are provided at the tail end of the handle 4. The puncture cannula 3 includes a cannula body 6 and a cannula head 7. A groove 8 is provided on the side of the cannula head 7, and a boss 9 extending to the groove 8 is provided on the side of the front end of the handle 4. In other embodiments, there are two or more grooves 8, and correspondingly two or more bosses 9.

[0033] Please see Figure 5 , Figure 6 and Figure 7 The sleeve head 7 includes a base 10, a neck 11, and a top 12. The outer diameter of the neck 11 is smaller than the outer diameter of the top 12, and the outer diameter of the top 12 is smaller than the outer diameter of the base 10. The self-closing valve 5 is detachably fitted onto the top 12. The sleeve body 6 includes a tube and a guide. The diameter of the guide is larger than the diameter of the tube. The guide of the sleeve body 6 is fixedly fitted inside the sleeve head 7. The inner wall of the guide of the sleeve body 6 has a protrusion, and the end of the tube of the sleeve body 7 has a chamfer.

[0034] Please see Figure 8 , Figure 9 and Figure 10 The self-closing valve 5 includes a valve body 13 with a concave arc surface 15 in the middle. A slit 14 is located in the arc surface 15, extending from the outer surface to the inner surface. The extension direction of the slit 14 forms an angle α with the perpendicular direction of the arc surface 15, i.e., the extension direction of the slit 14 is inclined to the perpendicular direction. The valve body 13 is made of silicone. In other embodiments, the self-closing valve can be made of other medical elastic materials, such as thermoplastic elastomers. The angle α can be any angle from 30 degrees to 60 degrees.

[0035] Please see Figure 11 and 12 The tip of the puncture needle 2 has five cutting surfaces, four of which are symmetrically arranged, and the fifth cutting surface 16 is located at the end of the tip.

[0036] The following is the general operation process and working principle of the ophthalmic puncture device of the present invention in surgery: (1) Use the 3mm and 4mm marks at the end of the handle to press and mark the puncture position on the flat part of the sclera (generally 3-4mm away from the edge of the cornea). (2) Remove the protective cap at the front end of the handle, align the tip of the puncture needle with the position marked in step (1), and insert it into the sclera vertically or at another specific angle to form an incision on the sclera. (3) The puncture needle continues to advance, and the puncture cannula is inserted into the incision along with the puncture needle until the head of the cannula contacts the sclera. During the advance, it can be inserted straight or twisted, and the twisting insertion method has less resistance. (4) Use forceps to hold the head of the puncture cannula and pull out the puncture needle; at the same time, the tail of the puncture cannula is held by the scleral incision and left on the eyeball as an instrument to enter the intraocular channel. (5) When an intraocular instrument enters the eye through the puncture cannula, the instrument tip applies radial pressure from the outside to the inside to the concave arc surface of the self-closing valve, causing the slit on the concave arc surface to open, facilitating the passage of the instrument. When the intraocular instrument is withdrawn from the eye through the puncture cannula, due to the presence of intraocular pressure, the concave arc surface bears pressure from the inside to the outside, causing the slit on the concave arc surface to close naturally. At this time, the edges on both sides of the slit overlap, forming a flap-like structure, which improves the sealing performance of the self-closing valve, effectively preventing intraocular fluid leakage and maintaining stable intraocular pressure.

[0037] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make appropriate changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. An ophthalmic puncture device, comprising a puncture needle, a puncture cannula, a handle, and a self-closing valve, characterized in that: The puncture needle is fixedly connected to the front end of the handle, the puncture cannula is detachably connected to the self-closing valve, the puncture cannula is movably sleeved on the puncture needle, and is movably connected to the front end of the handle.

2. The ophthalmic puncture device according to claim 1, characterized in that: The puncture cannula includes a cannula body and a cannula head, with at least one groove on the side of the cannula head; and at least one boss extending into the groove on the side of the front end of the handle.

3. The ophthalmic puncture device according to claim 1, characterized in that: The self-closing valve has a normally closed slit, through which intraocular instruments can easily enter the puncture cannula; and when no instruments are inserted, the slit can close naturally to prevent fluid from passing through.

4. The ophthalmic puncture device according to claim 2, characterized in that: The sleeve head includes a base, a neck, and a top; the outer diameter of the neck is smaller than the outer diameter of the top, and the outer diameter of the top is smaller than the outer diameter of the base; the self-closing valve is detachably sleeved on the top.

5. The ophthalmic puncture device according to claim 2, characterized in that: The sleeve body includes a tube and a guide, the diameter of the guide is larger than the diameter of the tube, and the guide of the sleeve body is fixedly sleeved inside the sleeve head.

6. The ophthalmic puncture device according to claim 3, characterized in that: The self-closing valve has a concave arc surface in the middle, and the slit is located in the arc surface, extending from the outer surface to the inner surface; the extension direction of the slit has an angle with the perpendicular direction of the arc surface.

7. The ophthalmic puncture device according to claim 5, characterized in that: The inner wall of the guide portion of the sleeve body is provided with a protrusion, and the end of the tube portion of the sleeve body is provided with a chamfer.

8. The ophthalmic puncture device according to claim 1, characterized in that: The tip of the puncture needle has five cutting edges, four of which are symmetrically arranged, and the fifth cutting edge is located at the end of the tip.

9. The ophthalmic puncture device according to claim 1, characterized in that, The handle has 3mm and 4mm markings at the end.

10. The ophthalmic puncture device according to claim 1, characterized in that, It also includes a protective cap fitted onto the front end of the handle.

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