A lens nucleus extractor for cataract surgery

Abstract

The present invention relates to the field of medical devices. The purpose is to provide a lens nucleus extractor for cataract surgery that can achieve gradual clamping, including a central tube, the top of which is provided with an elastic balloon, which is connected to the central tube; the lower end of the central tube is provided with a negative pressure suction cup, which is connected to the central tube; a buffer cylinder is also provided outside the sleeve below the sliding tube, the upper end of the buffer cylinder is open and the lower end is closed; the lower end of the sliding tube extends between the buffer cylinder and the sleeve to form a sliding fit; two air vents are also provided on both sides of the bottom of the buffer cylinder. The present invention can buffer the release of the elastic force of the coil spring, so that the movement of the curved rod presents a clamping trend of fast→slow→continuously slowing down, preventing the curved rod from directly damaging the lens nucleus after the coil spring is released.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, and in particular to a lens nucleus extractor for cataract surgery. Background Art

[0002] Cataract is one of the most common blinding eye diseases. The cornea and lens are the most important refractive structures of the human eye. Under normal circumstances, the lens is transparent. Light passes through the lens and other refractive media to reach the retina, so that external objects can be seen clearly. Once the lens becomes cloudy for some reason, it will affect the retinal imaging and make people unable to see clearly. That is, the lens opacity leads to decreased vision and cataracts. Surgery is currently the only effective treatment for cataracts. Cataract surgery generally uses transparent corneal micro-incision phacoemulsification to remove the cloudy lens. However, if the patient's corneal endothelial count is low, the nucleus is super-hard, the lens is subluxated, or the posterior capsule ruptures during phacoemulsification, the conditions for phacoemulsification are no longer met, and the lens nucleus needs to be manually delivered. The use effect of the existing lens nucleus delivery device cannot be guaranteed, which may cause the cataract lens nucleus to fall off. Once it falls into the vitreous cavity, it will cause secondary damage, affect the progress of cataract surgery, and even cause serious complications such as intraocular inflammation and retinal detachment, posing a great threat to the patient's visual function recovery.

[0003] For this reason, a method of fixing the lens nucleus by auxiliary clamping has appeared in the prior art. See Chinese utility model patent No. 202020147748.5, which discloses a cataract lens nucleus delivery device. After being adsorbed and dragged a certain distance, the spring is applied, and the spring drives the short tube to move downward, and the driving rod is driven by the short tube inclined rod in turn, thereby clamping the lens nucleus, achieving auxiliary clamping, and preventing the lens nucleus from falling. Then, because this method directly uses the spring drive, the instantaneous force of the spring is too large at the moment of application, and the curved rod is easy to hit the lens nucleus, which in turn causes damage to the lens nucleus, affecting subsequent pathological research. In severe cases, the lens nucleus is even directly shattered, causing debris to fall and affecting delivery. Summary of the invention

[0004] The object of the present invention is to provide a lens nucleus extractor for cataract surgery which can achieve gradual clamping.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a lens nucleus delivery device for cataract surgery, comprising a central tube, the top end of which is provided with an elastic balloon, the elastic balloon is connected to the central tube; the lower end of the central tube is provided with a negative pressure suction cup, the negative pressure suction cup is connected to the central tube;

[0006] A sleeve is fixedly sleeved outside the central tube, a first end is arranged at the upper end of the sleeve, a sliding tube which is slidably matched with the sleeve is sleeved outside the sleeve, a second end is arranged at the upper end of the sliding tube, a spiral spring is arranged outside the sleeve between the first end and the second end, and both ends of the spiral spring abut against the first end and the second end; a crank arm is also arranged on the side of the first end, and a stopper is arranged on the side of the second end; the middle part of the crank arm is hinged with the first end, and a hook is arranged at the lower part of the crank arm, and the position of the stopper is opposite to the hook;

[0007] Two curved rods are correspondingly arranged on both sides of the negative pressure suction cup, the middle section of the curved rod is hinged to the edges of both sides of the negative pressure suction cup through a short rod, the upper end of the curved rod is hinged to the lower end of the connecting rod, and the upper end of the connecting rod is hinged to a connecting seat fixedly arranged on the side wall of the sliding tube below the second end head;

[0008] A buffer cylinder is also provided outside the sleeve below the sliding tube, and the upper end of the buffer cylinder is open and the lower end is closed; the lower end of the sliding tube extends into between the buffer cylinder and the sleeve to form a sliding fit; two air leakage holes are also provided on both sides of the bottom of the buffer cylinder; two vertical blocking rods are provided at the lower end of the sliding tube corresponding to the air leakage holes, and the blocking rods are composed of a large-sized upper section and a small-sized lower section, and the upper section of the blocking rod gradually becomes thicker from bottom to top.

[0009] Preferably, a guide block is provided on the inner side wall of the sliding tube, and a vertical guide groove matching with the guide block is provided on the outer side wall of the sleeve, and the guide block is clamped in the guide groove.

[0010] Preferably, a mounting block is fixedly provided outside the central tube above the sleeve, a handle is provided on one side of the mounting block, and the handle is located above the crank arm.

[0011] Preferably, the mounting block and the sleeve are connected via a reinforcing rod, and a plurality of reinforcing rods are provided, and the plurality of short reinforcing rods are evenly distributed in a ring shape.

[0012] The beneficial effects of the present invention are mainly reflected in: being able to buffer the release of the elastic force of the coil spring, so that the movement of the curved rod presents a clamping trend of fast→slow→continuously slowing down, and preventing the curved rod from directly damaging the crystal nucleus after the coil spring is released. Specifically, during use, the present invention first squeezes the elastic balloon, and uses the negative pressure suction cup to contact the crystal nucleus, and then releases the elastic balloon, and uses the negative pressure generated by the elastic balloon to adsorb and drag the crystal nucleus until the crystal nucleus is delivered a certain distance. Press the crank arm with your finger, and the crank arm hook disengages from the block. At this time, under the action of the coil spring, the sliding tube moves downward, and then drives the curved rod to rotate through the connecting rod to achieve clamping of the crystal nucleus and prevent the crystal nucleus from falling. Therefore, the clamping speed of the curved rod depends entirely on the downward movement speed of the sliding tube.

[0013] During the downward movement of the sliding tube, the gas in the buffer tube needs to be discharged. In the front section of the downward movement of the sliding tube, the air leakage hole is fully opened, and the gas in the buffer tube can be discharged smoothly without affecting the normal movement of the sliding tube. As the sliding tube moves downward, the small-sized lower section of the blocking rod begins to enter the air leakage hole, and the air leakage amount of the air leakage hole decreases. The downward movement speed of the sliding tube slows down until the large-sized section of the blocking rod begins to enter the air leakage hole. As the air leakage amount of the air leakage hole further gradually decreases, it finally presents a gradually closed shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 for Figure 1 Enlarged view of part A in the middle. DETAILED DESCRIPTION

[0016] like Figure 1-2 As shown, a lens nucleus delivery device for cataract surgery includes a central tube 1, and an elastic balloon 2 is arranged at the top of the central tube 1, and the elastic balloon 2 is connected to the central tube 1. A negative pressure suction cup 3 is arranged at the lower end of the central tube 1, and the negative pressure suction cup 3 is connected to the central tube 1. In the initial stage of adsorption, the use mode of the present invention is the same as that of a traditional adsorption delivery device, and adsorption is performed by squeezing the elastic balloon 2 to generate negative pressure.

[0017] A sleeve 4 is fixedly sleeved outside the central tube 1. Usually, the sleeve 4 is directly bonded and fixed to the central tube 1. A first terminal 5 is arranged at the upper end of the sleeve 4. A sliding tube 6 is also sleeved outside the sleeve 4 and slides with the sleeve 4. The sliding tube 6 can move up and down along the sleeve 4. The movement of the sliding tube 6 drives the auxiliary clamping of the crystal nucleus. In order to improve the stability of the movement of the sliding tube 6, a guide block is arranged on the inner side wall of the sliding tube 6. A vertical guide groove matching with the guide block is arranged on the outer side wall of the sleeve 4. The guide block is clamped in the guide groove. The guide block and the guide groove are not shown in the figure of the present invention. The structure is relatively simple. Designers can refer to the existing scheme for adaptive design. Specifically, two curved rods 12 are correspondingly arranged on both sides of the negative pressure suction cup 3, the middle section of the curved rod 12 is hinged to the edges on both sides of the negative pressure suction cup 3 through a short rod 13, the upper end of the curved rod 12 is hinged to the lower end of the connecting rod 14, and the upper end of the connecting rod 14 is hinged to a connecting seat 15 fixedly arranged on the side wall of the sliding tube 6 below the second end 7.

[0018] As for how to drive the sliding tube 6, the technical solution adopted by the present invention is that the upper end of the sliding tube 6 is provided with a second terminal 7, and the sleeve 4 between the first terminal 5 and the second terminal 7 is provided with a coil spring 8, and the two ends of the coil spring 8 are against the first terminal 5 and the second terminal 7. After the sliding tube 6 moves upward, the compressed coil spring 8 can accumulate elastic potential energy, which then serves as the driving force of the sliding tube 6. As for how to lock the sliding tube 6, the side of the first terminal 5 of the present invention is also provided with a crank arm 9, and the side of the second terminal 7 is provided with a stopper 10. The middle part of the crank arm 9 is hinged with the first terminal 5, and the lower part of the crank arm 9 is provided with a hook 11. The position of the stopper 10 is opposite to the hook 11. The stopper 10 is constructed by the hook 11 to achieve locking. Of course, in order to ensure the stability of locking, a torsion spring can be provided at the hinge position of the crank arm 9.

[0019] The biggest difference of the present invention is that Figure 2 As shown in the figure, a buffer cylinder 16 is also provided outside the sleeve 4 below the sliding tube 6, and the upper end of the buffer cylinder 16 is open and the lower end is closed. The lower end of the sliding tube 6 extends between the buffer cylinder 16 and the sleeve 4 to form a sliding fit. Two air leakage holes 17 are also provided on both sides of the bottom of the buffer cylinder 16. Two vertical blocking rods 18 are provided at the lower end of the sliding tube 6 corresponding to the air leakage holes 17. The blocking rods 18 are composed of a large-sized upper section and a small-sized lower section, and the upper section of the blocking rod 18 gradually becomes thicker from bottom to top.

[0020] During use of the present invention, the elastic balloon 2 is first squeezed, and the negative pressure suction cup 3 is used to contact the crystal nucleus, and then the elastic balloon 2 is applied, and the negative pressure generated by the elastic balloon 2 is used to absorb and drag the crystal nucleus, and after the crystal nucleus is delivered for a certain distance. The crank arm 9 is pressed with a finger, and the hook 11 of the crank arm 9 is separated from the block 10. At this time, under the action of the spiral spring 8, the sliding tube 6 moves downward, and then the connecting rod 14 drives the curved rod 12 to rotate to achieve the clamping of the crystal nucleus, preventing the crystal nucleus from falling. Therefore, the clamping speed of the curved rod 12 depends entirely on the downward movement speed of the sliding tube 6.

[0021] During the downward movement of the sliding tube 6, the gas in the buffer tube 16 needs to be discharged. In the front section of the downward movement of the sliding tube 6, the air leakage hole 17 is fully opened, and the gas in the buffer tube 16 can be discharged smoothly without affecting the normal movement of the sliding tube 6. As the sliding tube 6 moves downward, the small-sized lower section of the blocking rod 18 begins to enter the air leakage hole 17, and the air leakage amount of the air leakage hole 17 decreases, and the downward movement speed of the sliding tube 6 slows down until the large-sized section of the blocking rod 18 begins to enter the air leakage hole 17. As the air leakage amount of the air leakage hole 17 further gradually decreases, it finally presents a gradually closed state.

[0022] In order to facilitate operation, the present invention should also be provided with a gripping component, specifically, a mounting block 19 is fixedly provided outside the central tube 1 above the sleeve 4, and a grip 20 is provided on one side of the mounting block 19, and the grip 20 is located above the crank arm 9. In order to improve the connection strength of the mounting block 19 on the central tube 1, the mounting block 19 is connected to the sleeve 4 through a reinforcing rod 21, and a plurality of the reinforcing rods 21 are provided, and the plurality of reinforcing short rods 13 are evenly distributed in a ring shape.

Claims

1. A lens nucleus extractor for cataract surgery, comprising a central tube (1), the top end of the central tube (1) being provided with an elastic balloon (2), the elastic balloon (2) being in communication with the central tube (1); the lower end of the central tube (1) being provided with a negative pressure suction cup (3), the negative pressure suction cup (3) being in communication with the central tube (1); Features: A sleeve (4) is fixedly sleeved outside the central tube (1), a first end head (5) is arranged at the upper end of the sleeve (4), a sliding tube (6) is sleeved outside the sleeve (4) and is in sliding cooperation with the sleeve (4), a second end head (7) is arranged at the upper end of the sliding tube (6), a coil spring (8) is arranged outside the sleeve (4) between the first end head (5) and the second end head (7), two ends of the coil spring (8) abut against the first end head (5) and the second end head (7); a crank arm (9) is also arranged on the side of the first end head (5), and a stopper (10) is arranged on the side of the second end head (7); the middle part of the crank arm (9) is hinged to the first end head (5), the lower part of the crank arm (9) is arranged with a hook (11), and the position of the stopper (10) is opposite to the hook (11); Two curved rods (12) are correspondingly arranged on both sides of the negative pressure suction cup (3); the middle section of the curved rod (12) is hinged to the edges of both sides of the negative pressure suction cup (3) via a short rod (13); the upper end of the curved rod (12) is hinged to the lower end of a connecting rod (14); the upper end of the connecting rod (14) is hinged to a connecting seat (15) fixedly arranged on the side wall of the sliding tube (6) below the second end head (7); A buffer cylinder (16) is also provided outside the sleeve (4) below the sliding tube (6), and the upper end of the buffer cylinder (16) is open and the lower end is closed; the lower end of the sliding tube (6) extends between the buffer cylinder (16) and the sleeve (4) to form a sliding fit; two air leakage holes (17) are also provided on both sides of the bottom of the buffer cylinder (16); two vertical blocking rods (18) are provided at the lower end of the sliding tube (6) corresponding to the air leakage holes (17), and the blocking rods (18) are composed of a large-sized upper section and a small-sized lower section, and the upper section of the blocking rod (18) gradually becomes thicker from bottom to top; A guide block is provided on the inner wall of the sliding tube (6), and a vertical guide groove matching the guide block is provided on the outer wall of the sleeve (4), wherein the guide block is clamped in the guide groove.

2. The lens nucleus extractor for cataract surgery according to claim 1, characterized in that: A mounting block (19) is fixedly provided outside the central tube (1) above the sleeve (4), and a handle (20) is provided on one side of the mounting block (19), and the handle (20) is located above the crank arm (9).

3. The lens nucleus extractor for cataract surgery according to claim 2, characterized in that: The mounting block (19) and the sleeve (4) are connected via a reinforcing rod (21), a plurality of reinforcing rods (21) are provided, and the plurality of reinforcing short rods (13) are evenly distributed in a ring shape.

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