Ultrafine needle mechanism for ophthalmologic operation

Abstract

The utility model discloses a superfine needle mechanism for ophthalmologic operation. The superfine needle mechanism comprises a superfine needle, a needle seat, a metal needle tube and a needle head connecting piece, one end of the superfine needle is connected with the needle base in an interference fit mode, the other end of the superfine needle is a pointed end, and the outer diameter of the superfine needle ranges from 50 micrometers to 180 micrometers and can reach the 34G-48G standard, so that the accuracy in minimally invasive operation is guaranteed. The needle base is connected with the metal needle tube through the large-diameter end, and the other end of the metal needle tube is connected with the needle head connecting piece to form a through channel. The needle head connecting piece is provided with a multi-stage transition structure and a limiting ring and used for being stably connected with the surgical instrument and providing a liquid or gas channel. In addition, a needle inserting depth limiting mechanism is arranged on the mechanism and comprises a linear guide rail, a sliding block and a baffle ring, it is ensured that the superfine needle stays at the set position, and excessive insertion is avoided. The surface of the superfine needle is provided with an annular recess, and the needle tip is a beveled smooth curved surface, so that tissue damage is effectively reduced, stability is enhanced, and the superfine needle is suitable for high-precision ophthalmic surgery operation.

Description

Technical Field

[0001] This utility model relates to the medical field, specifically to an ultra-fine needle mechanism for ophthalmic surgery. Background Technology

[0002] Ophthalmic surgery is a delicate and minimally invasive procedure that typically requires extremely high instrument stability and operational precision. Ultrafine needles are widely used in ophthalmic surgery, particularly for procedures such as punctures and injections. To meet the needs of different surgical scenarios, the diameter of ultrafine needles must meet certain standards; for example, an outer diameter of 50μm meets the 48G standard, and 180μm meets the 34G standard, thus satisfying the precision requirements of different surgeries.

[0003] Currently, ultra-fine needles are typically glued to metal needle tubes. However, this glue-based method presents several technical problems: the glue may cause displacement of the ultra-fine needle during use, affecting the coaxiality of the needle tip and the metal needle tube, thus reducing surgical precision. Furthermore, glue-based bonding has relatively low connection strength, easily leading to the risk of needle loosening or even detachment, increasing uncertainty during surgery and the potential risk of injury to the patient. Therefore, existing ultra-fine needle fixation methods urgently need improvement to ensure a stable connection between the ultra-fine needle and the needle tube, reduce displacement, and ensure high precision and safety, especially in delicate medical procedures such as ophthalmic microsurgery. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides an ultra-fine needle mechanism for ophthalmic surgery.

[0005] This utility model is achieved through the following technical solution:

[0006] This utility model discloses an ultra-fine needle mechanism for ophthalmic surgery, comprising:

[0007] The ultra-fine needle has an outer diameter of 50μm-180μm, with one end connected to the needle hub and the other end set as a pointed tip; 50μm can meet the 48G standard for ultra-fine needles, and 180μm can meet the 34G standard.

[0008] The needle holder is truncated cone-shaped, with a through hole at its central axis. The diameter of the through hole is smaller than the outer diameter of the ultrafine needle. The ultrafine needle is inserted into the through hole and fixedly connected to the needle holder with an interference fit. The ultrafine needle is inserted into the end of the needle holder with the smaller diameter, and the other end of the needle holder is connected to the metal needle tube.

[0009] The metal needle tube has an outer diameter equal to the larger diameter of the needle hub, and the metal needle tube is coaxially and fixedly connected to the larger diameter end of the needle hub.

[0010] To ensure a stable connection between the ultra-fine needle and the needle hub, this solution uses an interference fit to achieve a fixed connection, avoiding the problem of ultra-fine needle position displacement that may occur with traditional glue bonding methods. This ensures the coaxiality between the needle hub and the ultra-fine needle, improves the accuracy and stability of the needle tip, and makes it less likely to loosen or deviate during surgery.

[0011] Furthermore, the ratio of the outer diameter of the ultrafine needle to the outer diameter of the metal needle tube is less than 1:3. Controlling the ratio of the outer diameter of the ultrafine needle to the outer diameter of the metal needle tube to less than 1:3 not only reduces the space occupied by the ultrafine needle structure in the needle tube, but also makes the needle tube structure more delicate, suitable for minimally invasive operations in ophthalmic surgery, and further ensures that trauma to the patient's tissues is minimized during surgery.

[0012] Furthermore, the aforementioned metal needle tube and needle hub are either bonded together with adhesive or integrally formed. This adhesive bonding or integral forming design ensures that the components will not detach during use. Integral forming helps improve overall structural strength, while adhesive bonding can save manufacturing costs to some extent and facilitates later maintenance and replacement.

[0013] Furthermore, a needle connector is coaxially fixedly connected to the end of the metal needle tube away from the ultrafine needle. The needle connector is used to connect with surgical instruments. The central axis of the ultrafine needle, needle hub, metal needle tube, and needle connector forms a liquid or gas passage.

[0014] The needle connector is used to connect the ultra-fine needle mechanism to external surgical instruments and provides a communication channel through the ultra-fine needle, needle hub, metal needle tube and needle connector. It can be used in ophthalmic surgery to achieve precise liquid or gas transfer operations to meet different medical needs.

[0015] Furthermore, the aforementioned needle connector includes:

[0016] The first frustum transition section is frustum-shaped, and its small diameter is larger than the outer diameter of the metal needle tube; the metal needle tube is coaxially inserted into the first frustum transition section and fixedly connected with the first frustum transition section by interference fit.

[0017] The needle tube connection part is cylindrical, and its diameter is equal to the large diameter of the first frustum transition part; the needle tube connection part is coaxially and fixedly connected to one end of the large diameter of the first frustum transition part; the metal needle tube passes through the first frustum transition part and is coaxially inserted into the needle tube connection part, and is fixedly connected to the needle tube connection part by interference fit.

[0018] The second frustum transition section is frustum shaped, and its small diameter is equal to the diameter of the needle tube connection section; the needle tube connection section is coaxially and fixedly connected to one end of the small diameter of the second frustum transition section; the large diameter end of the second frustum transition section is coaxially and fixedly connected to the cylindrical support section.

[0019] The cylindrical support section is cylindrical, with one end connected to the transition part of the second frustum and the other end connected to the elliptical connecting part.

[0020] A limiting ring is provided on the circumferential surface of the cylindrical support section and can be used as a limiting ring when connected to surgical instruments;

[0021] The elliptical connecting part is a columnar body with an elliptical cross-section, one end of which is connected to the cylindrical support section; the elliptical connecting part can be connected to surgical instruments and restrict their rotational freedom.

[0022] The gasket, which is set at the limiting ring, can achieve a seal when the elliptical connecting part is connected to the surgical instrument;

[0023] The reinforcing ribs are arranged in a circular array on the circumference of the cylindrical support section and extend to the transition part of the second truncated cone and the connection part of the needle tube.

[0024] The progressively transitioning structure of the first frustum transition section, the needle tube connection section, the second frustum transition section, and the cylindrical support section gives the entire needle connector excellent mechanical strength and stability. The interference fit between its various parts reduces movement between components and limits any deviation or vibration of the ultra-fine needle during use, ensuring the coaxiality of the instruments during surgery.

[0025] Furthermore, the aforementioned metal needle tube is fitted with a needle insertion depth limiting mechanism. This needle insertion depth limiting mechanism is not connected to the metal needle tube but is fixedly connected to a surgical instrument in a fixed position. It is used to set the limit position of the ultra-fine needle mechanism. When the ultra-fine needle mechanism advances to the set limit position, the needle insertion depth limiting mechanism blocks the ultra-fine needle mechanism from advancing further.

[0026] The needle depth limiting mechanism is sleeved on the metal needle tube and is not directly connected to the metal needle tube. This avoids any additional mechanical force that may affect the stability of the ultra-fine needle mechanism, thereby ensuring the accuracy and controllability of the depth of the ultra-fine needle during surgical operations and avoiding potential tissue damage from over-insertion.

[0027] Furthermore, the aforementioned needle depth limiting mechanism includes:

[0028] A linear guide rail, one end of which is fixed in position and the other end extends to the metal needle tube; the linear guide rail is provided with a scale.

[0029] The slider is mounted on a linear guide rail and can move along the linear guide rail.

[0030] Set bolts, which are fitted and connected to the linear guide and slider, can temporarily fix the position of the slider relative to the linear guide;

[0031] The retaining ring is fixedly connected to the slider via a retaining ring connecting rod, which is arranged perpendicularly to the linear guide rail. The retaining ring is a circular ring, and the metal needle tube is inserted into the retaining ring without contacting each other. When the ultrafine needle mechanism moves to the position where it contacts the retaining ring, it is the limit position of the ultrafine needle mechanism's forward movement.

[0032] The combination of linear guides, sliders, set screws, and retaining rings allows the needle depth limiting mechanism to precisely set the needle depth by adjusting the position of the slider. The circular design of the retaining ring effectively restricts the ultra-fine needle mechanism at the set limit position, ensuring precise depth control during surgery.

[0033] Furthermore, the aforementioned ultrafine needles include:

[0034] The outer diameter of the needle body is 50μm-180μm;

[0035] The annular recesses are provided on the circumferential surface of the needle body. There are several annular recesses arranged in an arithmetic sequence along the central axis of the needle body.

[0036] The tip portion constitutes the tip of an ultrafine needle; the tip portion is a beveled tip with a bevel angle of 30-60°.

[0037] The ultra-fine needle is designed with an outer diameter in the range of 50μm-180μm. The annular depression on it can effectively increase the friction when in contact with tissue, avoid slippage due to the smooth surface of the needle, and thus improve the stability of the operation. It is suitable for ophthalmic surgery that requires high precision and stability.

[0038] Furthermore, the beveled surface of the aforementioned tip is a smooth curved surface that curves inward toward the tip. The beveled tip of the ultrafine needle forms a smooth curved surface of 30-60°, which helps reduce resistance when the needle tip contacts the tissue, alleviates patient pain, and improves the stability and accuracy of the needle tip entering the tissue. At the same time, this angle range optimizes the smoothness of insertion and withdrawal, reducing the risk of tissue damage.

[0039] Furthermore, the cross-sectional profile of the aforementioned annular depression is a pair of mirror-symmetrical figures. The figure is a smooth curve composed of an incomplete semicircle, a transition curve, and a straight line in sequence. The semicircle is located at one end near the tip, and the straight line coincides with the edge profile of the needle body.

[0040] The cross-section of the annular depression is designed as a smooth curve with mirror symmetry, combining incomplete semicircles, transition curves, and straight lines. This makes the depression structure more suitable for surgical procedures, reducing excessive friction of the ultra-fine needle during tissue insertion and making it suitable for delicate surgical needs.

[0041] This utility model's ophthalmic surgical ultrafine needle mechanism employs an interference fit between the ultrafine needle and the needle holder for secure connection, replacing adhesive bonding with a physical method. This improves the coaxiality, connection strength, and operational stability of the structure. Specifically, this solution offers the following advantages:

[0042] High-precision coaxiality: The ultra-fine needle and needle holder are tightly connected through an interference fit, avoiding the needle tip misalignment problem caused by glue bonding. This greatly improves the coaxiality of the ultra-fine needle and the metal needle tube, making the needle tip position more precise and stable, and ensuring surgical accuracy.

[0043] High structural stability: The interference fit connection significantly enhances the connection strength between the ultra-fine needle and the needle hub, avoiding the risk of needle loosening or falling off, improving the overall structural stability during surgery, and ensuring the safety and reliability of the surgical instruments.

[0044] Precise depth control: The needle depth limiting mechanism adopts an independent structure and is not directly connected to the metal needle tube, which ensures the accuracy of depth limitation and avoids needle position deviation caused by additional mechanical force. This ensures precise control of needle depth during surgery and prevents accidental damage to patient tissues.

[0045] Effectively reduces tissue damage: The tip of the ultra-fine needle is beveled at 30-60° to form a smooth curved surface, which reduces the resistance between the needle tip and the tissue, alleviates patient pain and improves insertion stability; the annular concave design increases friction during operation, prevents the needle from slipping during operation, further improves operation stability and reduces the risk of tissue damage. Attached Figure Description

[0046] Figure 1 : Front view of Example 1;

[0047] Figure 2 : A three-dimensional structural schematic diagram of Example 1;

[0048] Figure 3 : A three-dimensional structural cross-sectional view of Example 1;

[0049] Figure 4 Example 1: A three-dimensional structural diagram of the needle hub;

[0050] Figure 5 : Front view of Example 2;

[0051] Figure 6 Side view of the tip of Example 2;

[0052] Figure 7 Example 2: A partially enlarged schematic diagram of the annular depression;

[0053] Figure 8 : A three-dimensional structural schematic diagram of Example 3;

[0054] Figure 9 Example 3: A three-dimensional structural diagram of the needle connector;

[0055] Figure 10 Top view of Example 3;

[0056] Figure 11 : Front view of Example 4;

[0057] Figure 12 : A three-dimensional structural schematic diagram of Example 4;

[0058] Figure 13 Top view of Example 4;

[0059] Figure 14 Example 4: A three-dimensional sectional view of the needle depth limiting mechanism;

[0060] In the diagram: 1-Ultra-fine needle, 2-Needle seat, 3-Metal needle tube, 4-Needle head connector, 5-Needle depth limiting mechanism, 11-Tip, 12-Annular recess, 13-Needle body, 41-First frustum transition section, 42-Needle tube connector, 43-Second frustum transition section, 44-Cylindrical support section, 45-Limiting ring, 46-Elliptical connector, 47-Washer, 48-Reinforcing rib, 51-Linear guide rail, 52-Slider, 53-Setting bolt, 54-Retaining ring, 55-Retaining ring connecting rod. Detailed Implementation

[0061] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0062] Example 1: As Figure 1-4 As shown, an ultra-fine needle mechanism for ophthalmic surgery includes:

[0063] Ultrafine needle 1, the outer diameter of the ultrafine needle 1 is 50μm-180μm, one end is connected to the needle seat, and the other end is set as a tip; among them, 50μm can meet the 48G standard of ultrafine needle tip, and 180μm can meet the 34G standard.

[0064] Needle base 2, the needle base 2 is frustum shaped, and a through hole is provided at its central axis. The diameter of the through hole is smaller than the outer diameter of the ultrafine needle. The ultrafine needle 1 is inserted into the through hole and fixedly connected to the needle base 2 with an interference fit. The ultrafine needle 1 is inserted into the smaller diameter end of the needle base 2, and the other end of the needle base 2 is connected to the metal needle tube 3.

[0065] The metal needle tube 3 has an outer diameter equal to the larger diameter of the needle base 2, and the metal needle tube 3 is coaxially and fixedly connected to the larger diameter end of the needle base 2.

[0066] To ensure a stable connection between the ultra-fine needle 1 and the needle holder 2, this solution uses an interference fit to achieve a fixed connection, avoiding the positional displacement of the ultra-fine needle 1 that may be caused by traditional glue bonding methods. This ensures the coaxiality between the needle holder and the ultra-fine needle, improves the accuracy and stability of the needle tip, and makes it less prone to loosening or deviation during surgery.

[0067] Furthermore, the ratio of the outer diameter of the ultra-fine needle 1 to the outer diameter of the metal needle tube 3 is less than 1:3. Controlling the ratio of the outer diameter of the ultra-fine needle 1 to the outer diameter of the metal needle tube 3 to less than 1:3 not only reduces the space occupied by the ultra-fine needle structure in the needle tube, but also makes the needle tube structure more delicate, suitable for minimally invasive operations in ophthalmic surgery, and further ensures that trauma to the patient's tissues is minimized during surgery.

[0068] Furthermore, the aforementioned metal needle tube 3 and needle holder 2 are either bonded together with adhesive or integrally formed. This adhesive bonding or integral forming design ensures that the components will not detach during use. Integral forming helps improve the overall structural strength, while adhesive bonding can save manufacturing costs to some extent and facilitates later maintenance and replacement.

[0069] In this ophthalmic surgery ultra-fine needle mechanism, the assembly and fixation of the ultra-fine needle 1, needle holder 2, and metal needle tube 3 are achieved through interference fit and coaxial connection, ensuring the coaxial accuracy and stability between the ultra-fine needle tip and the needle tube, and avoiding needle tip displacement caused by traditional glue bonding. Specifically, the pointed end of the ultra-fine needle 1 is used for surgical puncture, and the other end is inserted into the small end through hole of the needle holder 2, and is tightly fixed to the needle holder 2 through interference fit; the large end of the needle holder 2 is connected to the metal needle tube 3 through coaxial bonding or integral molding, thereby making the ultra-fine needle 1, needle holder 2, and metal needle tube 3 integrated into one unit, greatly improving stability and meeting the high precision and minimally invasive requirements of ophthalmic surgery.

[0070] Example illustration:

[0071] Connection between the ultra-fine needle and the needle holder: The outer diameter of the ultra-fine needle 1 is controlled between 50μm and 180μm, with 50μm suitable for the 48G standard and 180μm suitable for the 34G standard. These diameter selections meet the requirements for precision and minimal invasiveness in ophthalmic surgery. The needle holder 2 adopts a frustum-shaped design with a through hole in the center smaller than the outer diameter of the ultra-fine needle. When the ultra-fine needle 1 is inserted into the through hole, it is tightly fixed through an interference fit, eliminating the need for glue and avoiding displacement problems caused by glue, effectively ensuring coaxiality.

[0072] The connection between the needle hub and the metal needle tube: The outer diameter of the metal needle tube 3 is the same as the large end diameter of the needle hub 2, and the two are coaxially connected and remain stable. The specific connection method can be adhesive bonding or direct one-piece molding, the latter of which is beneficial to enhance the structural strength of the needle tube and the needle hub. Since the ratio of the outer diameter of the metal needle tube to the outer diameter of the ultra-fine needle is controlled to be less than 1:3, the entire device is small in size and convenient for minimally invasive surgical operations.

[0073] Performance Results: The application of this ultra-fine needle mechanism in ophthalmic surgery demonstrates significantly improved stability and coaxial precision of the ultra-fine needle during the procedure, effectively avoiding risks caused by needle loosening or misalignment. The interference fit structure ensures the needle will not detach, while the flexible choice between glue bonding and one-piece molding adapts to different cost control and manufacturing requirements.

[0074] Example 2: As Figure 5-7 As shown, an ultra-fine needle mechanism for ophthalmic surgery includes Example 1;

[0075] Furthermore, the aforementioned ultrafine needle 1 includes:

[0076] Needle body 13, the outer diameter of the needle body 13 is 50μm-180μm;

[0077] Annular recesses 12 are provided on the circumferential surface of the needle body 13. A plurality of annular recesses 12 are provided and arranged in an arithmetic sequence along the central axis of the needle body 13.

[0078] Tip 11, which constitutes the tip of the ultrafine needle 1; the tip 11 is a beveled tip with a bevel angle of 30-60°.

[0079] The needle body 13 of the ultrafine needle 1 is designed with an outer diameter in the range of 50μm-180μm. The annular recess 12 on it can effectively increase the friction when in contact with tissue, avoid slippage due to the smooth surface of the needle, and thus improve the stability of operation. It is suitable for ophthalmic surgery that requires high precision and stability.

[0080] Furthermore, the oblique cut surface of the aforementioned tip 11 is a smooth curved surface that is concave towards the tip. The oblique cut of the tip 11 of the ultrafine needle 1 forms a smooth curved surface of 30-60°, which helps to reduce the resistance when the needle tip contacts the tissue, alleviate the patient's pain, and improve the stability and accuracy of the needle tip entering the tissue. At the same time, this angle range optimizes the smoothness of insertion and withdrawal, reducing the risk of tissue damage.

[0081] Furthermore, the cross-sectional profile of the aforementioned annular recess 12 is a pair of mirror-symmetrical figures. The figure is a smooth curve composed of an incomplete semicircle, a transition curve, and a straight line in sequence. The semicircle is located at one end near the tip 11, and the straight line coincides with the edge profile of the needle body 13.

[0082] The cross-section of the annular depression 12 is designed as a smooth curve with mirror symmetry, combining an incomplete semicircle, a transition curve, and a straight line. This makes the depression structure more suitable for surgical operation requirements, reducing excessive friction of the ultra-fine needle during tissue insertion, and making it suitable for delicate surgical needs.

[0083] Example 3: As Figure 8-10 As shown, an ultra-fine needle mechanism for ophthalmic surgery includes Embodiment 1 or 2;

[0084] Furthermore, a needle connector 4 is coaxially fixedly connected to the end of the metal needle tube 3 away from the ultrafine needle 1. The needle connector 4 is used to connect with surgical instruments. The central axis of the ultrafine needle 1, needle seat 2, metal needle tube 3 and needle connector 4 forms a liquid or gas passage.

[0085] The needle connector 4 is used to connect the ultra-fine needle mechanism to external surgical instruments and provides a communication channel through the ultra-fine needle 1, needle hub 2, metal needle tube 3 and needle connector 4. It can be used in ophthalmic surgery to achieve precise liquid or gas transfer operations to meet different medical needs.

[0086] Furthermore, the aforementioned needle connector 4 includes:

[0087] The first frustum transition portion 41 is frustum shaped and its small diameter is larger than the outer diameter of the metal needle tube 3; the metal needle tube 3 is coaxially inserted into the first frustum transition portion 41 and is fixedly connected with the first frustum transition portion 41 by interference fit.

[0088] The needle tube connection part 42 is cylindrical and its diameter is equal to the large diameter of the first frustum transition part 41. The needle tube connection part 42 is coaxially and fixedly connected to one end of the large diameter of the first frustum transition part 41. The metal needle tube 3 passes through the first frustum transition part 41 and is coaxially inserted into the needle tube connection part 42, and is fixedly connected to the needle tube connection part 42 with an interference fit.

[0089] The second frustum transition portion 43 is frustum-shaped, and its small diameter is equal to the diameter of the needle tube connection portion 42. The needle tube connection portion 42 is coaxially and fixedly connected to one end of the small diameter of the second frustum transition portion 43. The large diameter end of the second frustum transition portion 43 is coaxially and fixedly connected to the cylindrical support section 44.

[0090] The cylindrical support section 44 is cylindrical, with one end connected to the second frustum transition section 43 and the other end connected to the elliptical connecting section 46.

[0091] The limiting ring 45 is disposed on the circumferential surface of the cylindrical support section 44 and can be used as a limiting ring when connected to surgical instruments.

[0092] The elliptical connecting part 46 is a columnar body with an elliptical cross-section, and one end face of which is connected to the cylindrical support section 44; the elliptical connecting part 46 can be connected to surgical instruments and restrict their rotational freedom.

[0093] Washer 47, which is provided at the limiting ring 45, can achieve a seal when the elliptical connecting part 46 is connected to the surgical instrument.

[0094] Reinforcing ribs 48 are provided in a plurality of them, arranged in a circumferential array on the circumferential surface of the cylindrical support section 44, and extending to the second frustum transition section 43 and the needle tube connection section 42.

[0095] The progressively transitional structure of the first frustum transition section 41, the needle tube connection section 42, the second frustum transition section 43, and the cylindrical support section 44 gives the entire needle connector 4 excellent mechanical strength and stability. The interference fit between its parts reduces movement between components and limits any deviation or vibration of the ultra-fine needle during use, ensuring the coaxiality of the instruments during surgery.

[0096] Example 4: Figure 11-14 As shown, an ultra-fine needle mechanism for ophthalmic surgery includes Example 3;

[0097] Furthermore, the aforementioned metal needle tube 3 is fitted with a needle insertion depth limiting mechanism 5. The needle insertion depth limiting mechanism 5 is not connected to the metal needle tube 3, but is fixedly connected to a surgical instrument in a fixed position. It is used to set the limit position of the ultra-fine needle mechanism. When the ultra-fine needle mechanism advances to the set limit position, the needle insertion depth limiting mechanism 5 blocks the ultra-fine needle mechanism from advancing further.

[0098] The needle depth limiting mechanism 5 is sleeved on the metal needle tube 3 and is not directly connected to the metal needle tube 3. This avoids any additional mechanical force that may affect the stability of the ultra-fine needle mechanism, thereby ensuring the accuracy and controllability of the depth of the ultra-fine needle during surgical operations and avoiding potential tissue damage from over-insertion.

[0099] Furthermore, the aforementioned needle depth limiting mechanism 5 includes:

[0100] Linear guide 51, one end of which is fixed and the other end extends to the metal needle tube 3; the linear guide 51 is provided with a scale.

[0101] Slider 52, the slider 52 is mounted on linear guide rail 51 and can move along linear guide rail 51;

[0102] Set bolt 53 is fitted and connected to linear guide rail 51 and slider 52, and can temporarily fix the position of slider 52 relative to linear guide rail 51.

[0103] The retaining ring 54 is fixedly connected to the slider via the retaining ring connecting rod 55. The retaining ring connecting rod 55 is arranged perpendicularly to the linear guide rail 51. The retaining ring 54 is a circular ring. The metal needle tube 3 is inserted into the retaining ring 54, and the two do not contact each other. When the ultra-fine needle mechanism moves to the position that contacts the retaining ring 54, it is the limit position of the ultra-fine needle mechanism's forward movement.

[0104] The combined use of linear guide 51, slider 52, set screw 53, and retaining ring 54 allows the needle insertion depth limiting mechanism 5 to precisely set the needle insertion depth by adjusting the position of slider 52. The circular design of retaining ring 54 effectively limits the ultra-fine needle mechanism at the set limit position, ensuring precise depth control during surgery.

[0105] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An ultra-fine needle mechanism for ophthalmic surgery, characterized in that, include: The ultra-fine needle (1) has an outer diameter of 50-180 μm, one end of which is connected to the needle seat and the other end is set as a pointed tip; The needle seat (2) is truncated cone-shaped and has a through hole at its central axis. The diameter of the through hole is smaller than the outer diameter of the ultra-fine needle. The ultra-fine needle (1) is inserted into the through hole and fixedly connected to the needle seat (2) with an interference fit. The ultra-fine needle (1) is inserted into the end of the needle seat (2) with a smaller diameter, and the other end of the needle seat (2) is connected to the metal needle tube (3). The outer diameter of the metal needle tube (3) is equal to the larger diameter of the needle seat (2), and the metal needle tube (3) and the larger diameter end of the needle seat (2) are coaxially fixedly connected.

2. The ophthalmic surgical ultrafine needle mechanism according to claim 1, characterized in that, The ratio of the outer diameter of the ultrafine needle (1) to the outer diameter of the metal needle tube (3) is less than 1:

3.

3. The ophthalmic surgical ultrafine needle mechanism according to claim 1, characterized in that, The metal needle tube (3) and the needle seat (2) are glued together or formed as a single piece.

4. An ultra-fine needle mechanism for ophthalmic surgery according to any one of claims 1-3, characterized in that, The metal needle tube (3) is coaxially fixed to a needle connector (4) at one end away from the ultrafine needle (1). The needle connector (4) is used to connect with surgical instruments. The central axis of the ultrafine needle (1), needle seat (2), metal needle tube (3) and needle connector (4) forms a liquid or gas passage.

5. The ophthalmic surgical ultrafine needle mechanism according to claim 4, characterized in that, The needle connector (4) includes: The first frustum transition section (41) is frustum shaped and its small diameter is larger than the outer diameter of the metal needle tube (3); the metal needle tube (3) is coaxially inserted into the first frustum transition section (41) and is fixedly connected to the first frustum transition section (41) with an interference fit. The needle tube connecting part (42) is cylindrical, and its diameter is equal to the large diameter of the first frustum transition part (41). The needle tube connecting part (42) is coaxially fixedly connected to one end of the large diameter of the first frustum transition part (41). The metal needle tube (3) passes through the first frustum transition part (41) and is coaxially inserted into the needle tube connecting part (42), and is fixedly connected to the needle tube connecting part (42) with an interference fit. The second frustum transition section (43) is frustum shaped, and its small diameter is equal to the diameter of the needle tube connection section (42); the needle tube connection section (42) is coaxially and fixedly connected to one end of the small diameter of the second frustum transition section (43); the large diameter of the second frustum transition section (43) is coaxially and fixedly connected to the cylindrical support section (44). The cylindrical support section (44) is cylindrical, with one end connected to the second frustum transition part (43) and the other end connected to the elliptical connecting part (46); A limiting ring (45) is provided on the circumferential surface of the cylindrical support section (44) and can be used as a limiting ring when connected to surgical instruments; Elliptical connecting part (46), the elliptical connecting part (46) is a columnar body with an elliptical cross-section, one end of which is connected to the cylindrical support section (44); the elliptical connecting part (46) can be connected to surgical instruments and limit their rotational freedom; Washer (47), which is provided at the limiting ring (45), can achieve a seal when the elliptical connecting part (46) is connected to the surgical instrument; A number of reinforcing ribs (48) are provided and arranged in a circular array on the circumferential surface of the cylindrical support section (44) and extend to the transition part (43) of the second truncated cone and the needle tube connection part (42).

6. An ultra-fine needle mechanism for ophthalmic surgery according to any one of claims 1-3, characterized in that, The metal needle tube (3) is fitted with a needle depth limiting mechanism (5). The needle depth limiting mechanism (5) is not connected to the metal needle tube (3) but is fixedly connected to a surgical instrument with a fixed position. It is used to set the limit position of the ultra-fine needle mechanism. When the ultra-fine needle mechanism moves to the set limit position, the needle depth limiting mechanism (5) blocks the ultra-fine needle mechanism from moving further.

7. The ophthalmic surgical ultrafine needle mechanism according to claim 6, characterized in that, The needle insertion depth limiting mechanism (5) includes: A linear guide (51) has one end fixed and the other end extending to the metal needle tube (3); the linear guide (51) is provided with a scale. A slider (52) is mounted on a linear guide rail (51) and is able to move along the linear guide rail (51); Set bolt (53), which is fitted and connected to linear guide rail (51) and slider (52) to temporarily fix the position of slider (52) relative to linear guide rail (51); The retaining ring (54) is fixedly connected to the slider through the retaining ring connecting rod (55). The retaining ring connecting rod (55) is arranged perpendicularly to the linear guide rail (51). The retaining ring (54) is a circular ring. The metal needle tube (3) is inserted into the retaining ring (54) and the two do not contact each other. When the ultra-fine needle mechanism moves to the position that contacts the retaining ring (54), it is the limit position of the ultra-fine needle mechanism's forward movement.

8. An ultra-fine needle mechanism for ophthalmic surgery according to claim 1, 2, 3, 5, or 7, characterized in that, The ultrafine needle (1) includes: Needle body (13), the outer diameter of which is 50μm-180μm; Annular recesses (12) are provided on the circumferential surface of the needle body (13). A plurality of annular recesses (12) are provided and arranged in an arithmetic sequence along the central axis of the needle body (13). The tip (11) forms the tip of the ultrafine needle (1); the tip (11) is a beveled tip with a bevel angle of 30-60°.

9. The ophthalmic surgical ultrafine needle mechanism according to claim 8, characterized in that, The oblique cut surface of the tip (11) is a smooth curved surface that is concave towards the tip.

10. The ophthalmic surgical ultrafine needle mechanism according to claim 8, characterized in that, The cross-sectional profile of the annular recess (12) is a pair of mirror-symmetrical figures. The figure is a smooth curve composed of an incomplete semicircle, a transition curve and a straight line in sequence. The semicircle is located at one end near the tip (11), and the straight line coincides with the edge profile of the needle body (13).

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