Corneal intrastromal injection needle

Abstract

The present invention provides a corneal stroma injection needle, including a needle, the needle including a hollow needle tube body and a needle tip at the front end, a movable support and a limiter are arranged on the needle tube body, wherein the limiter limits the spacing between the support and the needle tip to a certain value. Since the diameter of the needle tube body increases at the position where the support is added, and the bottom surface of the support is arc-shaped, the contact surface between the support and the cornea of ​​the eyeball can be close to point contact when the support abuts, which is convenient for the operator to observe and adjust the angle between the needle tube body and the support, and ensure that the needle tube body can be tilted into the cornea. The function of the limiter is to make the length of the support from the needle tip to a preset value before puncture, which is convenient for the operator to determine the starting position before needle insertion, so as to design the depth of needle insertion according to the adjustment of the tilt angle of the needle tube body.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, in particular to a corneal stroma injection needle. Background Art

[0002] The cornea is a transparent film at the front of the eye. It is mainly divided into five layers, namely the corneal epithelium, anterior elastic layer, stroma, posterior elastic layer and endothelium. Its total thickness is only about 550μm, of which the stroma accounts for most of the thickness. For patients with corneal diseases, it is usually necessary to apply drugs to the cornea in order to increase the local drug concentration in the cornea and minimize the damage to the cornea caused by the disease. At present, the treatment method of injecting drugs into the corneal stroma is a more direct and efficient treatment method for the cornea. It requires ophthalmologists to inject by inserting the injection needle into the corneal stroma under the guidance of a microscope. Since there is no needle specifically used for corneal stroma injection, in actual operation, doctors usually use injection needles of existing specifications as a substitute. However, because the thickness of the corneal stroma is only about 550μm, when using this alternative needle to insert the needle, the doctor's experience and feel are completely relied upon to control the angle and depth of the needle's entry. If the insertion depth is not deep enough, it will result in insufficient drug administration or drug overflow, and the accuracy of re-puncture is required to be higher. If the insertion is too deep, it is very easy to pierce the entire layer of the cornea, resulting in treatment failure. Summary of the invention

[0003] In view of the above-mentioned deficiencies of the prior art, an object of the present invention is to provide a corneal stroma injection needle with a simple structure and the ability to conveniently control the direction and depth of corneal penetration.

[0004] The present invention achieves the above object by:

[0005] The corneal stroma injection needle of the present invention comprises a needle, wherein the needle comprises a hollow needle tube body and a needle tip at the front end, wherein a support member with an arc-shaped bottom surface and a limit member are movably provided on the needle tube body, and the limit member limits the distance between the support member and the needle tip to be constant.

[0006] Furthermore, the support member is a sphere arranged outside the needle tube body, and the needle tube body passes through the center of the sphere.

[0007] Furthermore, the limiting member is a raised ring fixed outside the needle tube body, and the supporting member is arranged on a side of the limiting member away from the needle tip, so that the supporting member is limited outside the limiting member.

[0008] Furthermore, controllable movement is achieved between the support member and the needle tube body through a damping medium.

[0009] Furthermore, the distance between the limiting member and the needle tip is 2 mm-4 mm.

[0010] Furthermore, the outer diameter of the spherical support member is 2mm-4mm.

[0011] Furthermore, the needle tube is provided with scale marks outside the body.

[0012] Beneficial effects of the present invention:

[0013] The present invention provides a corneal stroma injection needle, including a needle, the needle including a hollow needle tube body and a needle tip at the front end, a movable support and a limiter are arranged on the needle tube body, wherein the limiter limits the spacing between the support and the needle tip to a certain value. Since the diameter of the needle tube body increases at the position where the support is added, and the bottom surface of the support is arc-shaped, the contact surface between the support and the cornea of ​​the eyeball can be close to point contact when the support abuts, which is convenient for the operator to observe and adjust the angle between the needle tube body and the support, and ensure that the needle tube body can be tilted into the cornea. The function of the limiter is to make the length of the support from the needle tip to a preset value before puncture, which is convenient for the operator to determine the starting position before needle insertion, so as to design the depth of needle insertion according to the adjustment of the tilt angle of the needle tube body. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0015] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0016] Figure 2 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

[0017] Figure 3 This is a schematic diagram of the overall structure of Embodiment 3 of the present invention;

[0018] Figure 4 This is a schematic diagram of the position relationship between the embodiment 3 and the cornea before puncture;

[0019] Figure 5 for Figure 4 Schematic diagram of the state when the needle pierces the cornea;

[0020] Figure 6 A schematic diagram showing the comparison of needle puncture angle and depth for two diameters of spherical support members;

[0021] Figure 7 is a schematic cross-sectional structure diagram of Example 3;

[0022] Figure 8 This is the case where there are scale marks on the needle tube body 1 in Example 3.

[0023] In the figure, there is a needle tube body 1, a needle tip 2, a support member 3, a limit member 4, a flexible rope 41, a spring 42, a damping medium 5, a scale mark 6, and a corneal stroma 7. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The schematic implementation scheme of the present invention and its description are only used to analyze the present invention and are not intended to limit the present invention.

[0025] A corneal stroma injection needle comprises a needle, wherein the needle comprises a hollow needle tube body 1 and a needle tip 2 at the front end, wherein a support member 3 with an arc-shaped bottom surface and a limit member 4 are movably provided on the needle tube body 1, and the limit member 4 limits the distance between the support member 3 and the needle tip 2 to be constant.

[0026] The support member 3 is attached to the needle tube body 1, so that the diameter of the needle tube body 1 at the position where the support member 3 is added is increased, and the bottom surface is arc-shaped, so that the contact surface of the support member 3 and the cornea of ​​the eyeball when they are in contact is close to point contact, which is convenient for the operator to observe and adjust the angle between the needle tube body 1 and the support member 3, and ensure that the needle tube body 1 can be inclined to pierce the cornea. The function of the limiter 4 is to make the length of the support member 3 from the needle tip 2 to a preset value before puncture, so that the operator can determine the starting position before needle insertion, so as to design the depth of needle insertion according to the adjustment of the inclination angle of the needle tube body 1.

[0027] The specific position of the limiter 4 can be as shown in the attached Figure 3 As shown, it is arranged on the side of the support member 3 close to the needle tip 2, or as shown in the attached Figure 1 and Figure 2 When the stopper 4 is on the other side of the support member 3 away from the needle tip 2, the support member 3 can be connected to the needle tip 2 by a flexible rope 41 (such as the attached Figure 1 as shown) or spring 42 (as shown in the attached Figure 2As shown in the figure, the support member 3 is connected to the stopper 4, so that before the needle is inserted, the support member 3 is subjected to the gravity of the support member 3 and the elastic force of the spring to ensure that the distance between the support member 3 and the needle tip 2 is the preset value. When puncturing, the bottom of the support member 3 is against the cornea to be inserted. Since the support member 3 is movable relative to the needle tube body 1, when the support member 3 is against the cornea and does not move, the operator can hold the needle tube body 1 to adjust the tilt angle relative to the cornea to be punctured, and after the distance between the front end of the support member 3 and the needle tip 2 is the preset value, the needle is inserted and punctured at the tilt angle, and the relative distance between the puncture point and the support member 3 is observed to observe and control the depth of the needle. Since this structure can ensure that the needle enters the cornea at an angle, the injection tunnel formed by the operator during puncturing the corneal stroma is longer than the injection tunnel formed by vertically puncturing the corneal stroma, so the dosage of the corneal stroma can be guaranteed. At the same time, the support member 3 can be used as a support and reference member during puncture by the operator, so that the angle and depth of the needle entry can be controlled, which greatly reduces the requirements for the operator's experience and feel.

[0028] Furthermore, the support member 3 is a sphere arranged outside the needle tube body 1, and the needle tube body 1 passes through the center of the sphere.

[0029] Since the needle tube body 1 passes through the center of the spherical support 3, any point on the sphere can be used as a contact point with the cornea. Moreover, when the sphere rests against the cornea, the direction of the needle tube body 1 can be rotated 360 degrees, and the direction of the needle tip 2 relative to the cornea can be adjusted while ensuring that the distance between the contact point of the needle tube body 1 and the cornea remains unchanged.

[0030] Furthermore, the limiting member 4 is a raised ring fixed outside the needle tube body 1 , and the supporting member 3 is arranged on the limiting member 4 away from the needle tip 2 , so that the supporting member 3 is limited outside the limiting member 4 .

[0031] The stopper 4 is fixed outside the needle body 1, so that the distance between the needle tip 2 and the stopper 4 can be preset as needed, and the stopper 4 with a raised ring is arranged on the needle body 1. As the needle body 1 is inserted, the stopper 4 thereon also moves. The support member 3 is limited by the stopper 4 and can only move outside the needle body 1 on the side of the stopper 4 away from the needle tip 2. During operation, the support member 3 is against the cornea, the needle body 1 is tilted toward the cornea, and the support member 3 is tightly against the outside of the stopper 4 under the action of gravity. The tilt angle of the needle body 1 is adjusted so that the distance between the needle tip 2 and the support member 3 before puncture is a preset value. During the puncture process, the support member 3 ensures the angle of puncture, and the blocking effect of the stopper 4 with a raised ring ensures that the maximum depth of the needle tip 2 is not too deep, so excessive puncture can be well prevented.

[0032] Furthermore, the support member 3 and the needle tube body 1 can achieve controllable movement through the damping medium 5 .

[0033] As attached Figure 7 As shown, the damping medium 5 can be a viscous damping oil sealed and filled between the support member 3 and the needle tube body 1, or a flexible medium with a certain tension. Its purpose is to make the support member 3 move on the needle tube body 1, especially when the needle tube body 1 moves downwardly relative to the support member 3, stable and with controllable speed.

[0034] Furthermore, the distance between the stopper 4 and the needle tip 2 is 2 mm-4 mm.

[0035] For example, the distance may be 2 mm, 3 mm or 4 mm, etc., wherein the preferred distance is 2 mm.

[0036] Furthermore, the outer diameter of the spherical support member 3 is 2 mm-4 mm.

[0037] For example, the outer diameter may be 2 mm, 3 mm or 4 mm, etc., wherein the preferred outer diameter is 2 mm.

[0038] As attached Figure 6 As shown, a triangular structure is formed between the needle tube body 1, the spherical support member 3 and the cornea. As the outer diameter of the spherical support member 3 and the distance between the stopper 4 and the needle tip 2 are different, the inclination angle and penetration depth of the needle tube body 1 relative to the cornea will be different, so that the length of the formed injection tunnel is different. When the distance between the stopper 4 and the needle tip 2 is preferably 2 mm, when the outer diameter of the spherical support member 3 is larger, the penetration angle of the needle tube body 1 relative to the cornea is also larger, and the penetration depth is deeper. When the outer diameter is smaller, the penetration angle of the needle tube body 1 relative to the cornea is smaller, and the penetration depth is also shallower. Considering that the thickness of the cornea is only about 550 μm, and the depth of the injection tunnel formed in the corneal stroma, the outer diameter of the spherical support member 3 is preferably 2 mm.

[0039] Furthermore, a scale mark 6 is arranged outside the needle tube body 1 .

[0040] As attached Figure 8 As shown, the role of the scale mark is to enable the operator to clearly observe the depth of the needle insertion. The specific scale mark can be located on the entire needle body 1, or can be selected on the needle body 1 from the spherical support 3 to the direction away from the needle tip 2, so that the operator can intuitively see the specific scale of the needle body 1 moving relative to the spherical support 3 during insertion, which is convenient for the operator to accurately grasp the depth of the injection tunnel.

[0041] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the claims and scope of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. A corneal intrastromal injection needle, comprising a needle, wherein the needle comprises a hollow needle tube body (1) and a needle tip (2) at the front end, characterized in that: The needle tube body (1) is movably provided with a support member (3) having an arc-shaped bottom surface and a stop member (4), wherein the stop member (4) limits the spacing between the support member (3) and the needle tip (2) to be constant; the support member (3) is a sphere arranged around the outside of the needle tube body (1), and the needle tube body (1) passes through the center of the sphere; the stop member (4) is arranged on a side of the support member (3) close to the needle tip (2), or on the other side away from the needle tip (2). When the stop member (4) is at a position away from the needle tip (2), the stop member (4) is moved away from the needle tip (2). 2), the support member (3) can be connected to the stop member (4) via a flexible rope (41) or a spring (42) whose length can be shortened; a triangular structure is formed between the needle tube body (1), the spherical support member (3) and the cornea; and as the outer diameter of the spherical support member (3) and the distance between the stop member (4) and the needle tip (2) vary, the inclination angle of the needle tube body (1) relative to the cornea and the penetration depth will vary, thereby varying the length of the injection tunnel formed.

2. The corneal intrastromal injection needle according to claim 1, characterized in that: The limiting member (4) is a raised ring fixed outside the needle tube body (1), and the supporting member (3) is arranged on a side of the limiting member (4) away from the needle tip (2), so that the supporting member (3) is limited outside the limiting member (4).

3. The corneal intrastromal injection needle according to claim 2, characterized in that: Controllable movement is achieved between the support member (3) and the needle tube body (1) via a damping medium (5).

4. The corneal intrastromal injection needle according to claim 1, characterized in that: Furthermore, the distance between the stopper (4) and the needle tip (2) is 2 mm-4 mm.

5. The corneal intrastromal injection needle according to claim 1, characterized in that: The outer diameter of the spherical support member (3) is 2 mm to 4 mm.

6. The corneal intrastromal injection needle according to claim 1, characterized in that: The needle tube body (1) is provided with scale marks (6) on the outside.

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