Ophthalmic foreign matter catcher

Abstract

The foreign matter catcher comprises a shell, an elastic force driving mechanism, an operation locking mechanism and a mesh cage catching mechanism, the elastic force driving mechanism comprises a push rod and an elastic piece, and the operation locking mechanism is installed on the shell and used for switching the self-energy-releasing form of the elastic force driving mechanism into the force storage form and then locking the elastic force driving mechanism in the force storage form; the mesh cage catching mechanism is connected to the head end of the push rod, the mesh cage catching mechanism comprises a catching area close to the head end of the push rod and a binding area away from the head end of the push rod in the length direction of the push rod, the mesh cage catching mechanism at least has an unfolded state, and when the mesh cage catching mechanism is in the unfolded state, meshes of the catching area are larger than foreign matter in eyeballs; meshes of the constraint area are smaller than foreign matters in the eyeball. The risk of damage to eye tissue is reduced, and the capturing precision, the operation efficiency and the safety of the foreign matter capturing device for the ophthalmology department are improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an ophthalmic foreign body catcher. Background Technology

[0002] Foreign body retention is a common and highly dangerous pathological condition in vitreous diseases, usually caused by trauma, explosions, or industrial accidents, where foreign objects such as metal fragments, glass shards, or splinters enter the vitreous cavity. These foreign bodies can not only directly damage the retina or lens, but also trigger inflammatory reactions, infections, vitreous opacities, and even lead to retinal detachment or endophthalmitis, seriously threatening the patient's vision. Therefore, timely and accurate removal of foreign bodies from the vitreous body is a crucial step in treating these diseases and protecting visual function, which has spurred the technological demand for specialized foreign body removal instruments.

[0003] Given the complexity of vitreous foreign body removal surgery, traditional instruments such as magnetic forceps and mechanical claws, while widely used, have the following limitations: 1. Insufficient capture precision: Most traditional instruments employ claw or needle-like structures with relatively thick claws or needles, making it difficult to accurately capture tiny foreign bodies smaller than 0.6 mm in diameter, especially small particles inside or at the edges of the vitreous body, easily leading to capture failure or omission; 2. High risk of damage to ocular tissues: The tips are often sharp or rigid, easily scratching sensitive tissues such as the vitreous body and retina during operation, and even causing secondary damage. This risk is further increased when the foreign body is deeply embedded or the patient's cooperation is poor; 3. Low operational efficiency: Traditional instruments rely heavily on manual grasping or removal, with cumbersome procedures requiring a high level of surgeon experience. When the foreign body is slippery or in a difficult location, multiple attempts are often needed for successful removal, prolonging the operation time and increasing patient discomfort; 4. Lack of locking and safety mechanisms: Most traditional instruments are not equipped with effective locking or safety devices, making them prone to accidental activation or movement when not in use, increasing operational risks. In addition, the instrument is not stable enough during the capture process, which can easily cause foreign objects to fall off or shift.

[0004] Reducing the risk of damage to ocular tissues and improving the capture accuracy, operational efficiency, and safety of ocular foreign body catchers are technical problems that urgently need to be solved in this field. Summary of the Invention

[0005] Therefore, the present invention provides an ophthalmic foreign body catcher that reduces the risk of damage to ocular tissues and improves the catching accuracy, operational efficiency and safety of the ophthalmic foreign body catcher.

[0006] To solve the above-mentioned technical problems, the present invention provides an ophthalmic foreign body capture device, comprising: The shell is an elongated structure, having a head end and a tail end along its length, wherein the outer diameter of the portion of the shell near the head end is smaller than the outer diameter of the portion near the tail end. A spring-driven mechanism includes a push rod and an elastic element. The push rod extends along the length direction of the housing and is movably connected within the housing along its length direction. The push rod has a head end and a tail end in the length direction. The head end of the push rod and the head end of the housing face the same direction, and the tail end of the push rod and the tail end of the housing face the same direction. The elastic element applies a spring force to the push rod toward the head end of the housing. The spring-driven mechanism can switch between a power-accumulating mode and a power-releasing mode. When the spring-driven mechanism switches from the power-accumulating mode to the power-releasing mode, the deformation of the elastic element decreases, and the distance between the head end of the push rod and the head end of the housing decreases. An operation locking mechanism, installed on the housing, is used to lock the elastic drive mechanism in the storage state after switching from the energy release state to the energy storage state. A net cage capturing mechanism is connected to the head end of the push rod. The net cage capturing mechanism includes a capturing area near the head end of the push rod and a restraining area away from the head end of the push rod in the length direction of the push rod. The net cage capturing mechanism has at least an unfolded form. When the net cage capturing mechanism is in the unfolded form, the mesh size of the capturing area is larger than the foreign object in the eyeball, and the mesh size of the restraining area is smaller than the foreign object in the eyeball. In the first working state, the elastic drive mechanism is locked in the power storage mode, and the net cage capture mechanism is located inside the front end of the shell; In the second working state, the elastic drive mechanism is in an energy-releasing state, and the net cage capture mechanism is located outside the front end of the shell and is in an unfolded state.

[0007] Furthermore, the net cage capturing mechanism includes a cylindrical net, a first closing member, and a second closing member. The radial direction of the cylindrical net is perpendicular to the length direction of the shell. One opening of the cylindrical net is closed and connected to the first closing member. The first closing member is connected to the head end of the push rod. The other opening of the cylindrical net is closed and connected to the second closing member. The net cage capturing mechanism can switch between a closed state and an unfolded state. When the net cage capturing mechanism switches from the closed state to the unfolded state, the radial dimension of the cylindrical net increases, and the ratio of the size of the mesh along the axial direction of the cylindrical net to the size along the circumferential direction of the cylindrical net decreases. In the first working state, the net cage capturing mechanism is in a retracted form, and the mesh openings in the capturing area and the restraining area are both smaller than the foreign object inside the eyeball.

[0008] Furthermore, the mesh openings of the cylindrical mesh near the elastic drive mechanism are kite-shaped, while the mesh openings of the cylindrical mesh away from the elastic drive mechanism are rhomboid.

[0009] Furthermore, the cylindrical mesh is integrally formed using a laser-cut shape memory alloy tube.

[0010] Furthermore, the first closing member is tubular, and one of the openings of the cylindrical mesh is closed and connected to the inner side of the first closing member; the second closing member is pen cap shaped, and the other opening of the cylindrical mesh is closed and connected to the inner side of the second closing member.

[0011] Furthermore, the housing is provided with a spring receiving hole, a rotary knob receiving hole, a push rod receiving hole, and a wire mesh storage hole that are coaxially connected in sequence along its length. The diameters of the spring receiving hole and the push rod receiving hole are both smaller than the diameter of the rotary knob receiving hole. The two end walls of the rotary knob receiving hole are respectively provided with a first arc-shaped guide groove and a second arc-shaped guide groove. The first arc-shaped guide groove extends around the spring receiving hole, and the second arc-shaped guide groove extends around the push rod receiving hole. The side wall of the rotary knob receiving hole is provided with a first sliding guide groove and a second sliding guide groove that are connected. The first sliding guide groove and the second sliding guide groove both extend along the length of the housing. The first sliding guide groove is close to the front end of the housing, and the second sliding guide groove is close to the rear end of the housing. One of the groove walls of the first sliding guide groove is provided with a locking groove close to the second sliding guide groove. One end of the push rod along the axial direction is connected to the spring receiving hole, and the other end of the push rod along the axial direction passes through the push rod receiving hole and is slidably connected to the mesh cage receiving hole. A protruding ring is provided in the middle section of the push rod. The elastic element is a compression spring sleeved on the push rod. One end of the compression spring abuts against the end wall of the rotary knob receiving hole near the tail end of the housing, and the other end of the compression spring abuts against the protruding ring on the push rod. The operating locking mechanism includes a cylindrical rotary knob and a block-shaped push button. The cylindrical rotary knob is disposed in the rotary knob receiving hole and is rotatably and axially inseparably connected to the outer side of the protruding ring of the push rod. The cylindrical rotary knob has a first arc-shaped guide portion and a second arc-shaped guide portion protruding outwards at both ends facing the end wall of the rotary knob receiving hole. The first arc-shaped guide portion is rotatably connected to the first arc-shaped guide groove around the push rod and slidably connected to the first arc-shaped guide groove along the length direction of the push rod. The second arc-shaped guide portion is rotatably connected to the second arc-shaped guide groove around the push rod and slidably connected to the second arc-shaped guide groove along the length direction of the push rod. The cylindrical rotary knob has a third sliding guide groove and an operating part arranged sequentially along the circumference of the cylindrical rotary knob on the side facing the first sliding guide groove. The third sliding guide groove extends along the length direction of the housing. The operating part extends out of the housing from the first sliding guide groove. The operating part is slidably connected to the first sliding guide groove and can enter and exit the locking groove. When the operating part is in the locking groove, the third sliding guide groove is exposed to the first sliding guide groove, located at the opening of the locking groove and docking with the second sliding guide groove. The block-shaped push button is slidably and radially inseparable from the second sliding guide groove and the third sliding guide groove.

[0012] Furthermore, the cylindrical rotary knob is provided with a limiting groove on the side opposite to the first sliding guide groove, and the protruding ring on the push rod is limited in the limiting groove.

[0013] Furthermore, the push rod receiving hole is connected to the second arc-shaped guide groove, and the concave surface of the second arc-shaped guide portion is slidably connected to the outer surface of the push rod.

[0014] Furthermore, the housing includes a housing tail, a housing middle, an adapter, and an extension tube connected sequentially along its length. The rotary knob receiving hole, the spring receiving hole, and the first arc-shaped guide groove are all located at the housing tail. The push rod receiving hole and the second arc-shaped guide groove are located at the housing middle. The adapter has an interconnected mounting hole and an inlet hole. The extension tube is connected to the mounting hole. The tube hole of the extension tube is the mesh cage receiving hole. The inlet hole is a conical hole, with its large end connected to the push rod receiving hole and its small end connected to the mesh cage receiving hole. The outer diameters of the housing tail and the housing middle are the same and form a gripping part. The adapter is frustum-shaped, with its large diameter end connected to the housing middle and its small diameter end connected to the extension tube.

[0015] Furthermore, the housing is made of medical-grade ABS material and has a matte, non-slip outer surface.

[0016] Compared with the prior art, the above-mentioned technical solution of the present invention has the following advantages: The ophthalmic foreign body capture device of the present invention, on the one hand, by setting an elastic drive mechanism and a net cage capture mechanism, the elastic drive mechanism enables the net cage capture mechanism to quickly reach the preset position and make flexible contact with the eyeball, and the capture area after the net cage capture mechanism is unfolded is large, which can cover small foreign bodies in various areas of the eyeball, thereby improving the capture efficiency and accuracy of ophthalmic foreign bodies and reducing the risk of damage to eye tissues. On the other hand, by setting an operation locking mechanism, unexpected actions are avoided, ensuring the safety of the surgical procedure. Attached Figure Description

[0017] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] Figure 1 This is an overall schematic diagram of the ophthalmic foreign body catcher disclosed in this invention; Figure 2 This is a schematic diagram of the housing of the ophthalmic foreign body catcher disclosed in this invention; Figure 3 This is a schematic diagram of the tail section of the housing disclosed in this invention; Figure 4 This is a schematic cross-sectional view of the tail section of the housing disclosed in this invention; Figure 5 This is a schematic diagram of the longitudinal section of the middle part of the shell disclosed in this invention; Figure 6 This is a schematic cross-sectional view of the middle part of the shell disclosed in this invention; Figure 7 This is a schematic diagram of the longitudinal section of the adapter disclosed in this invention; Figure 8 This is a schematic diagram of the extension tube disclosed in this invention; Figure 9 This is a schematic diagram of the elastic drive mechanism disclosed in this invention; Figure 10 This is a schematic diagram showing the connection between the elastic drive mechanism and the operation locking mechanism disclosed in this invention. Figure 11 This is a schematic diagram of the cylindrical rotary slider disclosed in this invention; Figure 12 This is a cross-sectional schematic diagram of the cylindrical rotary slider disclosed in this invention; Figure 13 A schematic diagram of the connection between the block-shaped push button and the cylindrical rotary slide button disclosed in this invention; Figure 14 This is a schematic diagram of the net cage capture mechanism disclosed in this invention; Figure 15 This is a schematic diagram of the initial state of the ophthalmic foreign body catcher disclosed in this invention; Figure 16 This is a schematic diagram of the ophthalmic foreign body catcher in the ready-to-fire state disclosed in this invention; Figure 17 This is a schematic diagram of the ophthalmic foreign body catcher in its fully fired state as disclosed in this invention; Figure 18 This is a schematic diagram of the net cage capture mechanism disclosed in this invention capturing foreign objects; Figure 19 This is a schematic diagram of the net cage capture mechanism disclosed in this invention for binding foreign objects.

[0019] Among them, 1. Housing; 101. Spring receiving hole; 102. Rotary slider receiving hole; 103. Push rod receiving hole; 104. Wire cage storage hole; 105. First arc-shaped guide groove; 106. Second arc-shaped guide groove; 107. First sliding guide groove; 108. Second sliding guide groove; 109. Locking groove; 110. Tail end of housing; 111. Middle part of housing; 112. Adapter; 113. Extension tube; 114. Mounting hole; 115. Inlet hole; 2. Elastic drive mechanism; 201. Push rod; 202. Elastic element; 203. Convex ring; 3. Operating locking mechanism; 301. Columnar rotary slide button; 302. Block-shaped push button; 303. First arc-shaped guide part; 304. Second arc-shaped guide part; 305. Operating part; 306. Third sliding guide groove; 307. Limiting groove; 4. Net cage capture mechanism; 401. Capture area; 402. Restraint area; 403. Cylindrical net; 404. First closing component; 405. Second closing component; 5. Foreign object. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0021] See Figures 1 to 19 As shown, this invention discloses an embodiment of an ophthalmic foreign body catcher.

[0022] Ocular foreign body catchers include: The shell 1 is an elongated structure, and the shell 1 has a head end and a tail end in its length direction; The elastic drive mechanism 2 includes a push rod 201 and an elastic element 202. The push rod 201 extends along the length direction of the housing 1 and is movably connected to the housing 1 along its length direction. The push rod 201 has a head end and a tail end in the length direction. The head end of the push rod 201 and the head end of the housing 1 face the same direction. The tail end of the push rod 201 and the tail end of the housing 1 face the same direction. The elastic element 202 is used to apply an elastic force to the push rod 201 toward the head end of the housing. The elastic drive mechanism 2 can switch between a power storage mode and a power release mode. When the elastic drive mechanism 2 switches from the power storage mode to the power release mode, the deformation of the elastic element 202 decreases, and the distance between the head end of the push rod 201 and the head end of the housing 1 decreases. The locking mechanism 3 is installed on the housing and is used to lock the elastic drive mechanism 2 in the storage state after it switches from the energy release state to the energy storage state. The net cage capturing mechanism 4 is connected to the head end of the push rod 201. The net cage capturing mechanism 4 includes a capturing area 401 near the head end of the push rod 201 and a restraining area 402 away from the head end of the push rod 201 along the length direction of the push rod 201. The net cage capturing mechanism 4 has at least an unfolded form. When the net cage capturing mechanism 4 is in the unfolded form, the mesh of the capturing area 401 is larger than the foreign object in the eyeball, and the mesh of the restraining area 402 is smaller than the foreign object in the eyeball. In the first working state, the above-mentioned elastic drive mechanism 2 is locked in the power storage mode, and the above-mentioned net cage capture mechanism 4 is located inside the front end of the above-mentioned shell 1. In the second working state, the elastic drive mechanism 2 is in the energy release state, and the net cage capture mechanism 4 is located outside the front end of the shell 1 and is in the unfolded state.

[0023] In the above text, the housing 1 is the external protective part of the instrument and also the main part for doctors to hold and operate. The housing 1 is generally slender rod-shaped, with a thinner part near the head, which can penetrate into specific locations in the eye and constrain the axial displacement of the push rod 201. The part near the tail is the handle, which makes it convenient for doctors to operate in ophthalmic surgery and conforms to ergonomic design.

[0024] The elastic drive mechanism 2 is the power unit of the device. The push rod 201 is the core actuator in the elastic drive mechanism 2, responsible for converting the energy released by the elastic element 202 into linear motion and driving the net cage capture mechanism 4 to complete the capture action. The push rod 201 is usually made of high-strength titanium alloy, which has excellent rigidity and wear resistance, ensuring that it does not deform or break during high-speed movement. Its head end is designed with a specific structure (welded) to connect with the net cage capture mechanism to achieve precise force transmission and action synchronization. The thicker design of the middle section shaft increases the contact area, making it easier for the operating locking mechanism 3 to coordinate with the push rod 201 during operation. The movement trajectory of the push rod is strictly limited to ensure that it only moves at high speed along the axial direction, avoiding swaying or shaking, thereby ensuring the accuracy and consistency of the capture action. In addition, the surface of the push rod is treated with low friction to reduce motion resistance and improve response speed. When the elastic drive mechanism 2 switches from the energy storage mode to the energy release mode, the deformation of the elastic element 202 decreases, and the distance between the head end of the push rod 201 and the head end of the housing 1 decreases, thereby pushing the net cage capture mechanism 4 forward. This design can provide the net cage capture mechanism 4 with a fast and stable power, enabling it to quickly extend out of the housing 1, improving the efficiency and accuracy of capturing foreign objects.

[0025] The locking mechanism 3 is a safety feature of the instrument. Before surgery, the surgeon can adjust the elastic drive mechanism 2 to its stored state and lock it using the locking mechanism 3, ensuring that the net cage capture mechanism 4 can accurately deploy when needed. This mechanism guarantees the safety and controllability of the instrument during use, preventing accidental release of the elastic drive mechanism 2.

[0026] The net cage capturing mechanism 4 is responsible for directly contacting and adsorbing the foreign object 5 and removing it from the eye. When the net cage capturing mechanism 4 extends out of the shell 1 and is in the unfolded state, the mesh of the capturing area 401 is larger than the foreign object 5 inside the eyeball, making it easier for the foreign object 5 to enter the net cage. Then, as the net cage capturing mechanism 4 is pulled into the shell 1 by operating the locking mechanism 3, the binding area 402 gradually approaches the foreign object 5 until the foreign object 5 is completely inside the binding area 402. The mesh of the binding area 402 is smaller than the foreign object 5 inside the eyeball, which can firmly bind the foreign object 5 after it enters, preventing the foreign object 5 from escaping.

[0027] Specifically, when using the ophthalmic foreign body capture device, the elastic drive mechanism 2 is first locked in the charging state by operating the locking mechanism 3. Then, the front end of the housing 1 gradually approaches the foreign body 5 in the eyeball. The locking mechanism 3 is then released from the locking of the elastic drive mechanism 2, and the elastic drive mechanism 2 switches from the charging state to the releasing state, driving the push rod 201 to move rapidly. The push rod 201 drives the net cage capture mechanism 4 to quickly extend outside the housing 1, bringing the capture area 401 to the position of the foreign body 5 inside the eyeball. The foreign body 5 enters the capture area 401. Afterward, the locking mechanism is operated to switch the elastic drive mechanism 2 from the releasing state back to the charging state. During this process, the restraint area 402 gradually approaches the foreign body 5 until the foreign body 5 is completely inside the restraint area 402, and the net cage capture mechanism 4 completely retracts into the housing 1. The foreign body inside the eyeball is completely captured.

[0028] Through the above technical solution, on the one hand, by setting up an elastic drive mechanism and a net cage capture mechanism, the elastic drive mechanism enables the net cage capture mechanism to quickly reach the preset position and make flexible contact with the eyeball. The capture area after the net cage capture mechanism is unfolded is large, which can cover small foreign objects in various areas of the eyeball, thereby improving the capture efficiency and accuracy of ocular foreign objects and reducing the risk of damage to eye tissues. On the other hand, by setting up an operation locking mechanism, unexpected actions are avoided, ensuring the safety of the surgical procedure.

[0029] In this embodiment, the above-mentioned net cage capturing mechanism 4 includes a cylindrical net 403, a first closing member 404, and a second closing member 405. The radial direction of the cylindrical net 403 is perpendicular to the length direction of the shell 1. One opening of the cylindrical net 403 is closed and connected to the first closing member 404. The first closing member 404 is connected to the head end of the push rod 201. The other opening of the cylindrical net 403 is closed and connected to the second closing member 405. The net cage capturing mechanism 4 can switch between a closed state and an unfolded state. When the net cage capturing mechanism 4 switches from a closed state to an unfolded state, the radial dimension of the cylindrical net 403 increases, and the ratio of the size of the mesh of the cylindrical net 403 along the axial direction to the size along the circumferential direction decreases. In the first working state, the above-mentioned net cage capturing mechanism 4 is in a retracted form, and the mesh of the above-mentioned capturing area 401 and the mesh of the above-mentioned restraining area 402 are both smaller than the foreign object in the eyeball.

[0030] In the above text, the mesh of the cylindrical mesh 403 is deformable and the radial dimension of the cylindrical mesh 403 is variable. When the cylindrical mesh is deformed, the middle section is its main deformation area. The two ends of the cylindrical mesh 403 will not undergo radial deformation due to the constraints of the first closing member 404 and the second closing member 405.

[0031] Specifically, when the net cage capturing mechanism 4 is located inside the housing 1, it is in a contracted state under the constraint of the housing 1. The mesh of the cylindrical net 403 is elongated, which allows foreign objects to be trapped in the cylindrical net 403 while maintaining a small radial dimension. After the locking mechanism 3 unlocks the elastic drive mechanism 2, the elastic drive mechanism 2 causes the net cage capturing mechanism 4 to extend outside the housing 1. The cylindrical net 403 is no longer constrained by the housing 1 and, under its own elasticity or the reaction force of the eye space, begins to expand radially, changing the mesh from elongated to nearly circular or short and wide. At this time, the net cage capturing mechanism 4 can capture foreign objects.

[0032] Through the above technical solution, the net cage capturing mechanism 4 can be switched to a retracted state when not capturing foreign objects, reducing the space occupied, thereby making the radial dimension of the front end of the shell 1 as small as possible.

[0033] In this embodiment, the mesh openings of the cylindrical mesh 403 in the region near the elastic drive mechanism 2 are kite-shaped, while the mesh openings of the cylindrical mesh 403 in the region away from the elastic drive mechanism 2 are diamond-shaped.

[0034] In the above text, a kite-shaped hole refers to an asymmetrical quadrilateral hole composed of four sides, where one set of two adjacent sides are equal and shorter, and the other set of two adjacent sides are equal and longer. A rhombus-shaped hole refers to a symmetrical quadrilateral hole composed of four straight sides of equal length. When the net cage capturing mechanism 4 is in the retracted state, one diagonal of the kite-shaped hole is longer and aligns with the length direction of the cylindrical net 403, and one diagonal of the rhombus-shaped hole is longer and aligns with the length direction of the cylindrical net 403. The kite-shaped hole and the rhombus-shaped hole are deformed according to the principle of parallelogram deformation.

[0035] Specifically, the maximum spacing between the kite-shaped wires is 0.9 mm, and they are radially distributed to facilitate the entry of foreign objects into the mesh cage capture mechanism 4. The rhomboid holes are composed of crisscrossed wires, with a side length of approximately 0.5 mm.

[0036] The above technical solution sets the mesh openings of the cylindrical mesh to kite and rhombus shapes, which facilitates mesh deformation and adapts to the deformation of the cylindrical mesh itself.

[0037] In this embodiment, the cylindrical mesh 403 is integrally formed by laser cutting a shape memory alloy tube.

[0038] In the above text, laser cutting refers to the processing technology of using a high-energy laser beam to partially melt and cut the pipe. Integrated molding refers to the overall formation of the cylindrical mesh by cutting a single pipe. Specifically, laser cutting technology can be used to directly hollow out the pipe without subsequent welding or bonding steps, thus eliminating the connection interface.

[0039] Specifically, the aforementioned shape memory alloy tubes can be made of nickel-titanium alloy. The manufacturing process of the aforementioned cylindrical mesh requires three main steps: laser cutting, high-temperature shaping, and electrolytic polishing.

[0040] (1) Laser cutting process Material selection: Medical-grade nickel-titanium alloy (Ni-Ti) is selected, which has good biocompatibility, superelasticity and shape memory effect, making it an ideal material for ophthalmic instruments.

[0041] Cutting parameters: The laser outputs a pulsed laser with a wavelength of 1064nm, the power is controlled between 200–300W, the cutting speed is 10–20mm / s, and the focal diameter is ≤0.05mm. By adjusting the laser energy density, the cutting depth (approximately 0.1mm) can be precisely controlled to ensure uniform wire width in the basket (minimum wire width is four wires, i.e., approximately 0.04mm).

[0042] Structural Forming: Based on the functional requirements of the capture net, laser cutting directly forms a combined structure of a front-end diamond-shaped mesh and a rear-end large-pitch mesh. Front-end diamond-shaped mesh: Composed of cross-arranged nickel-titanium alloy wires, with a diamond side length of approximately 0.5mm. This structure can tightly wrap around foreign objects through elastic deformation, preventing slippage. Rear-end large-pitch mesh: The maximum spacing between the wires is 0.9mm, distributed radially, facilitating the entry of foreign objects into the basket from the rear.

[0043] The advantage of laser cutting lies in its non-contact processing, which avoids the squeezing or deformation of materials by mechanical tools and ensures the integrity of the basket structure. At the same time, the cutting accuracy can reach ±0.01mm, ensuring that the positional deviation of each wire is minimal, laying the foundation for subsequent processes.

[0044] (2) High-temperature qualitative treatment After the capture net is formed, it needs to be shaped at high temperature to activate the shape memory effect of the nickel-titanium alloy, so that it can automatically restore the preset shape during the surgical operation.

[0045] Process flow: The laser-cut capture mesh is placed in a vacuum furnace, heated to 550–600℃, held for 30–60 minutes, and then slowly cooled to room temperature at a rate of 10–15℃ / min.

[0046] Mechanism of action: At high temperatures, the austenitic phase (face-centered cubic structure) of the nickel-titanium alloy transforms into the martensite phase (hexagonal close-packed structure). After cooling, the martensite phase is retained, but the material "remembers" the preset basket shape through "training" (repeated stretching and tempering). When the capture net is deformed by external force (such as extrusion by an extension tube), it will automatically return to its initial expanded state, ensuring the stability of the capture process.

[0047] Quality control: The crystal structure of the capture mesh was examined using a metallographic microscope to confirm that the proportion of martensite phase was ≥95%; at the same time, its shape recovery rate (≥98%) was tested using a universal testing machine to ensure that no plastic deformation would occur during the operation.

[0048] (3) Electropolishing To reduce the irritation of the capture net to the eye tissue and extend its service life, electropolishing treatment is required.

[0049] Process principle: The capture net is immersed in an electrolyte (such as a mixture of phosphoric acid and sulfuric acid) and a DC voltage (10–15V) is applied, which causes the microscopic protrusions on the surface of the capture net (such as burrs left by laser cutting and heat-affected zones) to dissolve preferentially, thereby achieving surface smoothing.

[0050] Process parameters: Electrolyte temperature controlled at 40–50℃, polishing time 5–10 minutes, and current density 0.5–1 A / dm². By controlling these parameters, the surface roughness (Ra) of the capture mesh can be reduced from 1.6 μm after laser cutting to below 0.2 μm, achieving a mirror-like finish.

[0051] Through the above technical solutions, the integrated structure of laser-cut shape memory alloy tubes eliminates the node defects of the braiding process, significantly improving the deformation reliability of the cylindrical mesh. Simultaneously, its superelastic properties ensure stable mechanical properties during shape transitions, reducing the risk of mechanical damage to eye tissues. The integrated molding process reduces manufacturing steps, improves product consistency, and is suitable for mass production.

[0052] In this embodiment, the first closing member 404 is tubular, one of the openings of the cylindrical mesh 403 is closed and connected to the inner side of the first closing member 404, and the second closing member 405 is pen cap shaped, the other opening of the cylindrical mesh 403 is closed and connected to the inner side of the second closing member 405.

[0053] In the above text, the first constricting member 404 being tubular means that it has a cylindrical structure with an axially penetrating inner cavity, and its inner diameter matches the outer diameter of the tubular mesh 403 after it is closed, thus constraining the radial expansion of the tubular mesh 403. The second constricting member 405 being pen-cap shaped means that it is a bullet-shaped member with one end closed and a tapered transition, and its inner space is adapted to the closed shape of the tubular mesh 403.

[0054] Specifically, the first closing component 404 is fitted with the inner wall of the housing 1 with a clearance, allowing it to slide within the housing 1. The first closing component 404 is connected to the push rod 201 via laser welding. Laser welding has a small heat-affected zone, allowing for precise control of energy input and preventing the nickel-titanium alloy from losing its shape memory properties due to overheating. The second closing component features a smooth, bullet-shaped streamlined design. Its rounded shape and optimized surface significantly reduce friction and forward resistance when the instrument moves within the vitreous cavity, minimizing the risk of mechanical damage to delicate structures such as the retina, lens, and blood vessels. The seamless transition structure and hydrophilic coating further enhance biocompatibility, preventing tissue adhesion and postoperative inflammation, providing greater safety and improved postoperative recovery for vitrectomy. The streamlined shape allows surgeons greater flexibility in adjusting angles, precisely locating and capturing foreign objects within the confined and fluid-filled vitreous cavity, effectively shortening surgical time and reducing operational difficulty.

[0055] Through the above technical solutions, the first closing component ensures the synchronization and stability of the cylindrical net unfolding action, and the pen cap-shaped closing component reduces the outer diameter of the instrument through spatial adaptation. At the same time, its edge chamfering design reduces the risk of mechanical damage to eye tissues.

[0056] In this embodiment, the housing 1 is provided with a spring receiving hole 101, a rotary knob receiving hole 102, a push rod receiving hole 103, and a wire mesh storage hole 104 connected sequentially along its length. The diameters of the spring receiving hole 101 and the push rod receiving hole 103 are both smaller than the diameter of the rotary knob receiving hole 102. The two end walls of the rotary knob receiving hole 102 are respectively provided with a first arc-shaped guide groove 105 and a second arc-shaped guide groove 106. The first arc-shaped guide groove 105 extends around the spring receiving hole 101, and the second arc-shaped guide groove 106 extends around the spring receiving hole 101. Extending around the push rod receiving hole 103, the side wall of the rotary knob receiving hole 102 is provided with a first sliding guide groove 107 and a second sliding guide groove 108. The first sliding guide groove 107 and the second sliding guide groove 108 both extend along the length direction of the housing 1. The first sliding guide groove 107 is close to the first end of the housing 1, and the second sliding guide groove 108 is close to the tail end of the housing 1. A locking groove 109 is provided on one side wall of the first sliding guide groove 107, close to the second sliding guide groove 108. One end of the push rod 201 along the axial direction is connected to the spring receiving hole 101, and the other end of the push rod 201 along the axial direction passes through the push rod receiving hole 103 and is slidably connected to the wire mesh receiving hole 104. A protruding ring 203 is provided at the middle section of the push rod 201. The elastic element 202 is a compression spring sleeved on the push rod 201. One end of the compression spring abuts against the end wall of the rotary knob receiving hole 102 near the tail end of the housing 1, and the other end of the compression spring abuts against the protruding ring 203 on the push rod 201. The aforementioned locking mechanism 3 includes a cylindrical rotary knob 301 and a block-shaped push button 302. The cylindrical rotary knob 301 is disposed in the rotary knob receiving hole 102 and is rotatably and axially inseparably connected to the outside of the protruding ring 203 of the push rod 201. The cylindrical rotary knob 301 has a first arc-shaped guide portion 303 and a second arc-shaped guide portion 304 protruding at both ends facing the end wall of the rotary knob receiving hole 102, respectively. The first arc-shaped guide portion 303 is rotatably connected to the first arc-shaped guide groove 105 around the push rod 201 and slidably connected to the first arc-shaped guide groove 105 along the length direction of the push rod 201. The second arc-shaped guide portion 304 is rotatably connected to the second arc-shaped guide groove 106 around the push rod 201 and slidably connected to the second arc-shaped guide groove 106 along the length direction of the push rod 201. In the guide groove 106, the cylindrical rotary knob 301 facing the side of the first sliding guide groove 107 is provided with an operating part 305 and a third sliding guide groove 306 arranged sequentially along its circumference. The operating part 305 extends out of the housing 1 from the first sliding guide groove 107. The operating part 305 is slidably connected to the first sliding guide groove 107 along the length direction of the first sliding guide groove 107, and the operating part 305 can enter and exit the locking groove 109. When the operating part 305 is located in the locking groove 109, the third sliding guide groove 306 is exposed in the first sliding guide groove 107, located at the opening of the locking groove 109 and docking with the second sliding guide groove 108. The block-shaped push button 302 is slidably and non-detachably connected to the second sliding guide groove 108 and the third sliding guide groove 306.

[0057] In the above text, the spring receiving hole 101 refers to the cavity on the housing 1 used to install the spring, and the compression spring is partially embedded in the spring receiving hole 101. The push rod receiving hole 103 refers to the cavity on the housing 1 used to guide the push rod 201 to move. The rotary knob receiving hole 102 refers to the cavity inside the housing used to install the cylindrical rotary knob 301. All of these can be implemented using round holes. The diameter of the rotary knob receiving hole 102 is larger than that of the spring receiving hole 101 and the push rod receiving hole 103, thus forming end walls at both axial ends of the rotary knob receiving hole 102. The net cage storage hole 104 refers to the channel structure on the housing 1 used to guide the push rod 201 and store the net cage capturing mechanism 4. It can be implemented using a round hole channel. The first arc-shaped guide groove 105 refers to the arc-shaped slide rail provided around the spring receiving hole 101, which provides a combined rotational and sliding motion path for the first arc-shaped guide portion 303 of the cylindrical rotary knob 301. The second arc-shaped guide groove 106 refers to the arc-shaped slide rail provided around the push rod receiving hole 103, which provides a combined rotation and sliding motion path for the second arc-shaped guide portion 304 of the cylindrical rotary knob 301. The first sliding guide groove 107 and the second sliding guide groove 108 refer to the guide structures for guiding the cylindrical rotary knob 301 and the block push button 302. The locking groove 109 refers to the groove structure on the side wall of the first sliding guide groove 107, which is used to restrict the movement path of the operating part 305 when it slides in to achieve a locked state. The third sliding guide groove 306 refers to the channel provided on the side of the cylindrical rotary knob 301 that communicates with the second sliding guide groove 108. Specifically, it can be formed by slotting the side of the cylindrical rotary knob 301, and is used to guide the sliding path of the block push button 302 in the locked state. The block push button 302 being radially non-detachable means that the block push button 302 is radially limited with the second sliding guide groove 108 and the third sliding guide groove 306. Specifically, a T-groove or dovetail groove structure can be used to prevent the block push button 302 from detaching from the second sliding guide groove 108 and the third sliding guide groove 306.

[0058] Specifically, the rotary knob is the operating interface and a key component for interaction between the doctor and the instrument. It also serves to seal the end of the tube against dust. When the doctor rotates the knob to a predetermined angle, the housing releases the spring-loaded drive mechanism, completing the "trigger" action. The rotary knob and housing employ a precise rotational fit to ensure smooth, uninterrupted rotation. Its design balances ease of operation and safety, serving as the starting point for the entire firing process. The rotary knob features two arc-shaped guide sections (protrusions), designed to combine mechanical movement with sealing protection. During rotation, these arc-shaped guide sections achieve smooth contact with the internal structure of the housing, reducing frictional resistance and ensuring smooth operation. Simultaneously, these arc-shaped guide sections completely cover the end opening of the housing at different stages—locked, fired, and retracted—effectively sealing against dust and preventing external contaminants or foreign objects from entering the instrument, ensuring the cleanliness and stable operation of the internal structure. The rotary slider is the part of the rotary slider that directly contacts the doctor. It has dense grooves to increase friction, improving tactile feedback and preventing slippage, ensuring precise operation even when the doctor is wearing gloves. The limiting groove is the part inside the rotary slider that directly engages with the push rod, transmitting motion and force. The shape and size of the limiting groove precisely match the shape of the push rod's protruding ring, ensuring synchronized movement between the rotary slider and the push rod. During firing, the sidewalls of the limiting groove withstand significant impact forces; therefore, the material needs to be high-strength and wear-resistant, and is made of engineering plastic. Furthermore, the depth and width of the limiting groove are optimized to ensure the stability of the push rod's movement while preventing wobbling or jamming due to excessive clearance. The second sliding guide groove is a safety structure on the rotary slider that engages with the block push button to prevent accidental triggering. The position and shape of the second sliding guide groove precisely correspond to the protrusion of the block push button. When the block push button is locked, its protrusion engages in the second sliding guide groove, restricting the rotational movement of the rotary slider and thus preventing accidental triggering. The primary function of the block-shaped push button is to prevent accidental activation under unforeseen circumstances, thereby ensuring the safety of the surgical procedure. To improve the accuracy and stability of the surgeon's operation of the block-shaped push button during surgery, especially when hands may be contaminated with saline or surgical gloves are worn, numerous transverse grooves are machined on the block-shaped push button. This increases the roughness of the contact surface, enhances friction, and prevents slippage and accidental activation during operation. A boss is placed along the movement path of the block-shaped push button, forming a locking structure with the tube tail, which serves as a limit and enhances the stability of the block-shaped push button. Furthermore, the depth of the block-shaped push button grooves can be adjusted in the tube tail and rotating slider, physically limiting the range of movement of the block-shaped push button and preventing damage to the internal mechanical structure due to excessive pushing or flicking.

[0059] Specifically, the push rod 201 slides axially under the constraint of the push rod receiving hole 103, and the compression spring generates elastic force through the abutting convex ring 203 and the end wall of the rotary knob receiving hole 102. The cylindrical rotary knob 301 rotates and moves axially in the arc-shaped guide groove through the first arc-shaped guide part 303 and the second arc-shaped guide part 304, driving the push rod 201 to move backward against the spring force. When the operating part 305 slides along the first sliding guide groove 107 to the locking groove 109, the third sliding guide groove 306 aligns with the second sliding guide groove 108, and the block-shaped push button 302 slides from the second sliding guide groove 108 into the third sliding guide groove 306, forming a mechanical interlock. At this time, the push rod 201 is locked, and the net cage capturing mechanism 4 remains in the storage position. When unlocking, the block push button 302 is pushed back to the second sliding guide groove 108, the operating part 305 disengages from the locking groove 109, the push rod 201 is reset forward under the action of the compression spring, and the net cage capture mechanism 4 unfolds.

[0060] The above technical solution can reliably lock the elastic drive mechanism, thereby reducing the risk of tissue damage caused by instrument misoperation during surgery.

[0061] In this embodiment, the cylindrical rotary knob 301 is provided with a limiting groove 307 on the side opposite to the first sliding guide groove 107, and the protruding ring 203 on the push rod 201 is limited in the limiting groove 307.

[0062] In the above text, the limiting groove 307 refers to the groove structure machined on the surface of the cylindrical rotary knob 301, whose inner diameter forms a clearance fit with the outer diameter of the convex ring 203 of the push rod 201. This structure physically limits the axial degree of freedom of the push rod 201, preventing the push rod 201 from disengaging from the cylindrical rotary knob 301 under the action of elastic force. The cylindrical rotary knob 301 and the push rod 201 can rotate relative to each other, but cannot move axially relative to each other.

[0063] Specifically, during assembly, the protruding ring of the push rod 201 is first inserted radially into the limiting groove of the guide post-shaped rotary knob 301, and then both are placed into the rotary knob receiving hole.

[0064] The above technical solution facilitates the installation of the push rod, the cylindrical rotary knob, and the housing.

[0065] In this embodiment, the push rod receiving hole 103 is connected to the second arc-shaped guide groove 106, and the concave surface of the second arc-shaped guide portion 304 is slidably connected to the outer surface of the push rod 201.

[0066] As described above, due to limited space, the distance between the push rod 201 and the second arc-shaped guide is small. If the push rod receiving hole 103 and the second arc-shaped guide groove 106 are machined separately, the partition wall between them will be thin, resulting in lower structural strength and potentially causing structural instability. Therefore, the inner groove of the second arc-shaped guide groove 106 is connected to the push rod receiving hole 103.

[0067] By using the above technical solution, the push rod receiving hole 103 and the second arc-shaped guide groove 106 are made to be interconnected, which does not affect the guidance and makes the structure more stable.

[0068] In this embodiment, the housing 1 includes a housing tail 110, a housing middle 111, an adapter 112, and an extension tube 113 connected sequentially along its length. The rotary knob receiving hole 102, the spring receiving hole 101, and the first arc-shaped guide groove 105 are all located at the housing tail 110. The push rod receiving hole 103 and the second arc-shaped guide groove 106 are located at the housing middle. The adapter 112 has a mounting hole 114 and an inlet hole 115 that communicate with each other. The extension tube 113 is connected to the mounting hole 114. The tube hole of the extension tube 113 is the mesh cage receiving hole 104. The inlet hole 115 is a tapered hole, with its large end connected to the push rod receiving hole 103 and its small end connected to the mesh cage receiving hole 104. The outer diameters of the tail portion 110 and the middle portion 111 of the housing are the same and form a grip portion. The adapter 112 is frustum-shaped, with its large diameter end connected to the middle portion 111 of the housing and its small diameter end connected to the extension tube 113.

[0069] In the above description, the tail section 110, the middle section 111, the adapter 112, and the extension tube 113 are separate structures, which are processed separately and then assembled together. This facilitates the machining of various holes and slots on the housing, and also facilitates the assembly of the elastic drive mechanism, the operating locking mechanism, and the net cage capture mechanism into the housing.

[0070] Specifically, the tail section of the housing, located at the end of the instrument handle, is one of the main contact areas for the doctor during operation. Its cylindrical design is ergonomic, facilitating precise pressing with the thumb or forefinger. The internal space is rationally laid out to accommodate components such as springs, push rods, and rotary knobs, and includes pre-drilled slots for the block-shaped push button and rotary knob for secure locking and release control. The tail section is the starting point of the firing action. By providing a counter-force to the spring, it efficiently transmits the force to the elastic drive mechanism, thereby driving the cage capture mechanism to achieve precise capture. Therefore, its structural stability directly affects the instrument's operational accuracy and reliability, and is a crucial guarantee of overall performance. The tail section features a first arc-shaped guide groove that precisely matches the first arc-shaped guide on the rotary knob, allowing the rotary knob to slide smoothly and maintain stable positioning. Simultaneously, the tail section also has a second sliding guide groove, employing a design that is narrower at the top and wider at the bottom, ensuring that the push button can move axially within it without slipping out. In addition, a spring hole is pre-drilled inside the tail section of the housing to accommodate the spring and push rod. The bottom of the hole provides spring rebound support, ensuring reliable mechanism reset. The first sliding guide groove at the tail section of the housing is divided into two sections. The first section is the locking area, marked "LOCK". When the rotary knob is in this position, the right end of the slot abuts against the right end of the rotary knob, achieving the locking function. The second section is the release firing area, marked "RELEASE". When the rotary knob is turned, it will disengage from the first section's restriction, release along the second section's groove, and complete the firing action. This design ensures the safety and controllability of the instrument during operation.

[0071] The central section of the housing is the main body, connecting the tail end to the extension tube and serving as the supporting structure for the entire instrument. The central section is slender and rod-shaped, with a hollow core to accommodate the push rod. It is made of medical-grade ABS material, possessing excellent mechanical strength and corrosion resistance. Simultaneously, it ensures a lightweight design, reducing the operator's workload, and features a matte finish to minimize glare during surgery. A second arc-shaped guide groove is pre-installed in the central section of the housing. This groove precisely matches the second arc-shaped guide portion on the rotary knob, ensuring smooth axial sliding and complete release during operation. The design of the second arc-shaped guide groove not only limits the radial displacement of the rotary knob but also ensures the stability of its trajectory, thereby improving the instrument's operational accuracy and safety. A connecting section is located at the left end of the central section, connecting to the tail end of the housing via an interference fit. During installation, the segment is directly pressed into the tail hole of the housing using specialized equipment. The interference fit and clamping force ensure a tight fit between the middle and tail sections of the housing. This connection method not only enhances structural rigidity but also avoids the risk of loosening or detachment, ensuring the stability of the device during prolonged operation. A push rod receiving hole is located in the center of the housing, primarily for mounting the push rod and the second arc-shaped guide. This space is rationally designed, ensuring smooth push rod movement while providing sufficient support for other components, thus ensuring the reliability and accuracy of the firing process. A mounting hole is located at the right end of the middle section of the housing for connecting the extension tube. This hole and the extension tube also use an interference fit, achieving a tight connection through a press-fit process during installation. This design not only simplifies the assembly process but also further enhances the overall structural stability of the housing, providing a reliable guarantee for the precise positioning of the front-end net cage capture mechanism.

[0072] The adapter is a component used to fix the extension tube, ensuring a stable connection between the extension tube and the middle of the housing. The adapter is a slender cone shape, with a smaller diameter at the front end (the end closer to the surgical area) and a gradually increasing diameter at the rear end (the end connected to the middle of the housing), resembling a truncated cone in overall shape. It is also made of medical-grade ABS material. The left end of the adapter has a connecting section that connects to the mounting hole at the right end of the housing using an interference fit. Through press-fitting with specialized equipment, the radial pressure and clamping force generated by the interference fit ensure a tight and stable mechanical connection between the adapter and the middle of the housing, effectively preventing loosening or axial displacement during use. The guide hole uses a variable diameter structure: the diameter at the left end is larger than the diameter of the push rod and gradually tapers, facilitating the smooth insertion of the push rod into the predetermined position during installation; the diameter at the right end is clearance-fitted with the push rod, achieving both radial limitation of the push rod and ensuring smooth linear movement in the axial direction, thus providing a stable and precise force transmission path for the firing device. The adapter has a pre-drilled hole for mounting the extension tube on its right end, which is also press-fitted to the tube wall to ensure that the extension tube is firmly fixed in the predetermined position. This design not only achieves a seamless connection between the extension tube and the adapter, but also effectively prevents the extension tube from rotating or moving axially during surgery through structural rigidity, ensuring the accuracy and stability of the capture mechanism's movement within the instrument.

[0073] The extension tube, the foremost part of the housing, is used to constrain and protect the net cage capture mechanism. The tube is long and slender with a hollow interior to house the push rod. Its primary function is to constrain the axial displacement of the radial capture mechanism, ensuring a stable trajectory during extension and retraction. Made of medical-grade ABS material, it possesses excellent mechanical strength and corrosion resistance. The surface has a matte finish to reduce intraoperative reflection. The front edge is polished or rounded to further enhance safety. The left end of the extension tube is tightly connected to the adapter via an interference fit, ensuring structural rigidity and preventing loosening or displacement during use. The right end is designed as the storage and constraint area for the net cage capture mechanism. Precise inner diameter matching achieves stable positioning and axial movement guidance for the capture mechanism, thereby ensuring high precision and safety of the instrument during surgical procedures.

[0074] The above technical solution sets the shell as a split structure, which facilitates the installation of the elastic drive mechanism, the operation locking mechanism and the net cage capture mechanism, and also facilitates the processing and manufacturing of the shell.

[0075] In this embodiment, the shell 1 is made of medical-grade ABS material and has a matte, non-slip outer surface.

[0076] In the above text, medical-grade ABS material refers to acrylonitrile-butadiene-styrene copolymer that meets the ISO10993 biocompatibility standard. Medical-grade ABS material possesses good mechanical strength and corrosion resistance. The matte anti-slip outer surface refers to a non-mirror textured layer formed after sandblasting or chemical etching, which is a surface with a uniformly distributed microscopic uneven structure.

[0077] Specifically, medical-grade ABS material ensures the safety of the shell in contact with intraocular tissues through chemical stability and bioinertness, avoiding inflammatory reactions caused by residual monomers in traditional industrial ABS. Since the ophthalmic foreign body catcher is a single-use device, the shell 1 must be sterilely packaged before leaving the factory to ensure no external contamination occurs during surgery. The matte, non-slip outer surface increases surface roughness, reducing glare during surgery and improving grip stability.

[0078] Through the above technical solutions, by combining the application of a medical-grade material certification system with specific surface treatment processes, the structural strength of the device is maintained while simultaneously improving material safety and operational stability, and avoiding interference with doctors.

[0079] In the initial state, the block-shaped push button is located directly above the rotary slider, locking the rotary slider in its initial position. At this time, the extension tube completely secures the net cage capture mechanism within the tube, ensuring the device is in a safe locked state (e.g., Figure 15 (As shown).

[0080] When the instrument is needed, the operator pushes the block-shaped push button backward to release the lock on the rotary slide button, and the instrument enters the ready-to-fire state. At this time, the rotary slide button can be rotated a certain angle until it is completely released from the limiting constraint of the locking groove (e.g., Figure 16 (As shown).

[0081] Align the net cage capture mechanism with the object to be captured above it, and rotate the rotary knob. Once the knob disengages from its limit position, the compression spring quickly pushes it forward, propelling it rapidly along the first sliding guide groove until it stops at the bottom of the slot. At this point, the device is in the fully fired state, and the capture mechanism completes its release action (e.g., Figure 17 (As shown).

[0082] When fully fired, the capture net is in the open state, as shown in Figure 18, which is a schematic diagram of the foreign object capture area. At this time, the foreign object enters the capture area through the area shown in the figure.

[0083] Pull back the rotary knob; the capture net will elastically deform, dragging the foreign object into the outer sleeve. Remove the capture device to complete the capture operation. The foreign object size is defined as a maximum cross-sectional dimension of 0.5 mm or less and a length of 1 mm, as shown in Figure 19, a schematic diagram of the foreign object restraint area.

[0084] Compared with existing technologies, this product has four significant advantages.

[0085] 1. Higher capture accuracy The device uses a basket-shaped nickel-titanium alloy structure with a minimum wire width of four wires, divided into ten groups. The maximum spacing between the wires at the rear end is 0.9 mm. It can stably capture tiny foreign objects with a diameter of 0.2 to 0.6 mm, which is far superior to the performance of traditional devices in handling small foreign objects.

[0086] 2. Improved operational safety The device features a bullet-shaped connector at the tip, providing excellent guidance and protection, effectively reducing the risk of damage to ocular tissues. Simultaneously, a safety button and rotating slider locking mechanism ensure the device is securely locked when not in use, preventing accidental operation.

[0087] 3. Improved capture efficiency The device uses the principle of shape memory metal deformation recovery. When the connecting tube is pulled, the rear end of the capture net is squeezed and contracted by the extension tube, while the front diamond mesh structure wraps the foreign object and collects it into the extension tube. The whole process is smooth and efficient, significantly improving the success rate of foreign object capture.

[0088] 4. Reliable firing mechanism The device features a three-state control mechanism: initial state, ready-to-fire state, and fully fired state. After the lock is released by the safety block push button, rotating the slider quickly completes the firing action under the action of the spring. The capture mechanism responds quickly and operates stably, avoiding capture failure due to improper operation.

[0089] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An ophthalmic foreign body catcher characterized by, The application relates to a device for removing intraocular foreign bodies, comprising: a shell, which is an elongated structure, the shell having a head end and a tail end in the length direction of the shell, the outer diameter of the shell near the head end part being smaller than the outer diameter of the shell near the tail end part; a spring driving mechanism, which comprises a push rod and a spring, the push rod extending along the length direction of the shell and being movably connected to the shell in the length direction, the push rod having a head end and a tail end in the length direction, the head end of the push rod being oriented in the same direction as the head end of the shell, the tail end of the push rod being oriented in the same direction as the tail end of the shell, the spring being used for applying a spring force to the push rod towards the head end of the shell, the spring driving mechanism being switchable between a force storage mode and a force release mode, when the spring driving mechanism is switched from the force storage mode to the force release mode, the deformation amount of the spring is reduced, and the distance between the head end of the push rod and the head end of the shell is reduced; an operation locking mechanism, which is installed on the shell and is used for locking the spring driving mechanism in the force storage mode after the spring driving mechanism is switched from the force release mode to the force storage mode; a mesh cage capturing mechanism, which is connected to the head end of the push rod, the mesh cage capturing mechanism comprising a capturing area near the head end of the push rod and a binding area away from the head end of the push rod in the length direction of the push rod, the mesh cage capturing mechanism having at least an unfolded mode, when the mesh cage capturing mechanism is in the unfolded mode, the mesh hole of the capturing area is larger than an intraocular foreign body, and the mesh hole of the binding area is smaller than the intraocular foreign body; in a first working state, the spring driving mechanism is locked in the force storage mode, and the mesh cage capturing mechanism is located in the head end of the shell; in a second working state, the spring driving mechanism is in the force release mode, and the mesh cage capturing mechanism is located outside the head end of the shell and is in the unfolded mode.

2. The ophthalmic foreign body capturer according to claim 1, characterized by, The mesh cage capturing mechanism comprises a cylindrical mesh, a first closing part and a second closing part, the cylindrical mesh is radially perpendicular to the length direction of the shell, one barrel opening of the cylindrical mesh is closed and connected to the first closing part, the first closing part is connected to the head end of the push rod, the other barrel opening of the cylindrical mesh is closed and connected to the second closing part, the mesh cage capturing mechanism is switchable between a closed mode and an unfolded mode, when the mesh cage capturing mechanism is switched from the closed mode to the unfolded mode, the radial dimension of the cylindrical mesh is increased, and the ratio of the axial dimension of the mesh hole of the cylindrical mesh to the circumferential dimension of the mesh hole of the cylindrical mesh is reduced; in the first working state, the mesh cage capturing mechanism is in the closed mode, and the mesh hole of the capturing area and the mesh hole of the binding area are both smaller than the intraocular foreign body.

3. The ophthalmic foreign body capturer according to claim 2, wherein, The mesh hole of the region of the cylindrical mesh near the spring driving mechanism is a reed-shaped hole, and the mesh hole of the region of the cylindrical mesh away from the spring driving mechanism is a diamond-shaped hole.

4. The ophthalmic foreign body capturer according to claim 2, wherein, The cylindrical mesh is integrally formed by laser cutting a memory alloy pipe.

5. The ophthalmic foreign body capturer according to claim 2, wherein, The first closing part is in a tubular shape, one barrel opening of the cylindrical mesh is closed and connected to the inner side of the first closing part, and the second closing part is in a pen cap shape, the other barrel opening of the cylindrical mesh is closed and connected to the inner side of the second closing part.

6. The ophthalmic foreign body capturer according to claim 1, wherein, The shell is provided with spring accommodating holes, rotary slide button accommodating holes, push rod accommodating holes and mesh cage receiving holes connected coaxially along the length direction of the shell in sequence, the diameters of the spring accommodating holes and the push rod accommodating holes are smaller than the diameter of the rotary slide button accommodating holes, the two end walls of the rotary slide button accommodating holes are respectively provided with first and second arc-shaped guide grooves, the first arc-shaped guide groove extends around the spring accommodating hole, and the second arc-shaped guide groove extends around the push rod accommodating hole, the side wall of the rotary slide button accommodating hole is provided with first and second sliding guide grooves in communication, the first and second sliding guide grooves extend along the length direction of the shell, the first sliding guide groove is close to the head end of the shell, and the second sliding guide groove is close to the tail end of the shell, one of the groove walls of the first sliding guide groove is provided with a locking groove close to the second sliding guide groove; One end of the push rod in the axial direction is connected in the spring accommodating hole, the other end of the push rod in the axial direction passes through the push rod accommodating hole and is slidingly connected in the mesh cage receiving hole, the middle segment position of the push rod is provided with a convex ring, the elastic member is a compression spring sleeved on the push rod, one end of the compression spring abuts against the end wall of the rotary slide button accommodating hole close to the tail end of the shell, and the other end of the compression spring abuts against the convex ring on the push rod; The operation locking mechanism comprises a cylindrical rotary slide button and a block-shaped push button, the cylindrical rotary slide button is arranged in the rotary slide button accommodating hole and is rotatably and axially non-detachably connected to the outside of the convex ring of the push rod, the two ends of the cylindrical rotary slide button towards the end walls of the rotary slide button accommodating hole are respectively provided with first and second arc-shaped guide portions protruding outward, the first arc-shaped guide portion is rotatably connected in the first arc-shaped guide groove along the length direction of the push rod and is slidingly connected in the first arc-shaped guide groove, the second arc-shaped guide portion is rotatably connected in the second arc-shaped guide groove along the length direction of the push rod and is slidingly connected in the second arc-shaped guide groove, the side surface of the cylindrical rotary slide button towards the first sliding guide groove is provided with a third sliding guide groove and an operation portion arranged in sequence along the circumferential direction of the cylindrical rotary slide button, the third sliding guide groove extends along the length direction of the shell, the operation portion extends out of the shell from the first sliding guide groove, the operation portion is slidingly connected in the first sliding guide groove, and the operation portion can enter and exit the locking groove, when the operation portion is located in the locking groove, the third sliding guide groove is exposed from the first sliding guide groove and is located at the slot opening of the locking groove and is in abutment with the second sliding guide groove, and the block-shaped push button is slidingly and radially non-detachably connected in the second sliding guide groove and the third sliding guide groove.

7. The ophthalmic foreign body capturer according to claim 6, wherein, The side of the cylindrical rotary slide button away from the first sliding guide groove is provided with a limiting groove, and the convex ring on the push rod is limited in the limiting groove.

8. The ophthalmic foreign body capturer according to claim 6, wherein, The push rod accommodating hole is communicated with the second arc-shaped guide groove, and the inner concave surface of the second arc-shaped guide part is slidingly connected with the outer side surface of the push rod.

9. The ophthalmic foreign body capturer according to claim 6, wherein, The shell comprises a shell tail part, a shell middle part, an adapter and an extension tube connected in sequence along the length direction of the shell, the rotating knob accommodating hole, the spring accommodating hole and the first arc-shaped guide groove are arranged in the shell tail part, the push rod accommodating hole and the second arc-shaped guide groove are arranged in the shell middle part, the adapter is provided with a mounting hole and a lead-in hole which are communicated with each other, the extension tube is connected in the mounting hole, the tube hole of the extension tube is the mesh cage accommodating hole, the lead-in hole is a taper hole, the large end of the taper hole is connected with the push rod accommodating hole, and the small end of the taper hole is connected with the mesh cage accommodating hole, the outer diameters of the shell tail part and the shell middle part are consistent and constitute a holding part, the adapter is a circular truncated cone, the large diameter end of the adapter is connected with the shell middle part, and the small diameter end of the adapter is connected with the extension tube.

10. The ophthalmic foreign body capturer according to claim 1, wherein, The shell is made of medical grade ABS material and has a matte anti-slip outer surface.

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