Sponge-based visual subretinal fluid suction device

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to a visual subretinal fluid suction device based on sponge. Comprising a transparent liquid suction cylinder, the interior of the transparent liquid suction cylinder is hermetically and rotatably connected with an extrusion cylinder, the interior of the extrusion cylinder is slidably connected with a core rod, and one end of the core rod is fixedly provided with a first sponge body; the extrusion cylinder comprises an extrusion cylinder body, a plurality of through holes are symmetrically formed in the side wall of the extrusion cylinder body in a penetrating mode, the through holes fixedly communicate with first sliding pipes, and the first sliding pipes on the same side are jointly connected with an extrusion mechanism in a sliding mode; the extrusion mechanism comprises an extrusion plate and a folding water suction box which are connected through a second sliding pipe, and a second sponge body is arranged in the folding water suction box; according to the invention, not only can repeated liquid absorption operation of the first sponge body be realized, but also visual operation of liquid can be realized; the problem of secondary injury caused by backflow of extruded liquid can be avoided, meanwhile, movement of the suction device relative to the eyes is reduced, and injury to the eyes is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a sponge-based visualized subretinal fluid aspiration device. Background Art

[0002] Retinal detachment is the separation of the retinal neuroepithelial layer and the pigment epithelial layer. There is a potential gap between the two layers. The fluid retained in the gap after separation is called subretinal fluid. If not treated promptly, it may lead to severe vision loss or even blindness. Before performing retinal laser photocoagulation or retinal cryosurgery, the subretinal fluid around the retinal tear should be drained as much as possible to ensure that the retinal neuroepithelial layer and the pigment epithelial layer around the retinal tear are completely adhered (i.e., retinal reattachment) to enhance the effect of retinal laser photocoagulation or retinal cryosurgery to close the retinal tear and improve the success rate of the operation.

[0003] The Chinese patent with application number 202411054871.1 discloses a subretinal fluid suction device. It includes a pipette, in which a core rod is slidably connected, and a first sponge is fixedly installed at one end of the core rod, and the first sponge passes through one end of the pipette and is arranged outward; the end of the pipette away from the first sponge is threadedly connected to an extension tube, and the end of the core rod away from the first sponge is threadedly connected to a push plate, and a first spring is sleeved on the core rod, and the two ends of the first spring are respectively abutted against the extension tube and the push plate; an extrusion mechanism is installed in the pipette for squeezing the first sponge. This patent avoids the situation that the retina is sucked and causes secondary damage due to conventional negative pressure suction; and this patent realizes multiple suction of the first sponge, improving the efficiency of subretinal fluid suction; this patent avoids the backflow of the absorbed liquid under the retina.

[0004] The reusable water-absorbing sponge device reduces the difficulty and risk of surgery and improves surgical efficiency. Although it can absorb repeatedly, the absorption capacity is always limited, and it is impossible to check with the naked eye whether the sponge has been saturated with liquid, resulting in the operator being unable to make a timely judgment. This may make it impossible for the saturated sponge to absorb liquid, causing liquid reflux and secondary eye damage. At the same time, when the sponge is squeezed and reused, if the squeezed liquid cannot be quickly stored, it will still reflux and cause secondary damage. In addition, how to minimize the relative movement of the device relative to the eye to avoid damage to the eye is also the key to the success of the operation. Summary of the invention

[0005] In order to address the deficiencies in the prior art, the present invention provides a visual subretinal fluid suction device based on a sponge. The present invention can achieve both repeated suction operations of the first sponge and visual operations of the liquid through the cooperation of a first sponge, a folded water suction box and an extrusion mechanism, thereby facilitating an operator to timely monitor the absorption saturation of the liquid and avoiding secondary damage caused by liquid reflux. The present invention can make the liquid completely flow into the first water hole and the second water hole through the structural design of the first closed ring and the second closed ring being sealed and rotatably connected to the ends of the corresponding extrusion cylinder, thereby further avoiding the problem of secondary damage caused by the reflux of the squeezed liquid, and at the same time reducing the movement of the suction device relative to the eye to avoid damage to the eye.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A visual subretinal fluid suction device based on a sponge comprises a transparent suction tube, wherein the transparent suction tube is sealed and rotatably connected to an extrusion tube inside, wherein a core rod is slidably connected to the inside of the extrusion tube, and a first sponge is fixedly mounted on one end of the core rod;

[0008] The extrusion cylinder includes an extrusion cylinder body, and a plurality of through holes are symmetrically opened on the side wall of the extrusion cylinder body, and a first sliding tube is fixedly connected to the through hole, and the first sliding tube on the same side is slidably connected to the extrusion mechanism; the extrusion mechanism includes an extrusion plate and a folding water suction box connected by a second sliding tube, and a second sponge body is arranged in the folding water suction box; the second sliding tube is slidably connected to the first sliding tube; an extrusion spring is sleeved on the second sliding tube, and the extrusion spring is located in the extrusion cylinder body; the folding water suction box is located between the extrusion cylinder and the transparent liquid-absorbing cylinder, and the extrusion plate is located inside the extrusion cylinder.

[0009] Furthermore, the first slide tube is provided with a plurality of first water holes, and the second slide tube is provided with a plurality of second water holes; when the extrusion plate squeezes the first sponge body, the first water holes are connected with the second water holes; when the first sponge body extends out of the extrusion tube, the first water holes and the second water holes are staggered and closed.

[0010] Furthermore, the folding water suction box includes two curved panels, which are fixedly connected through a folding sleeve; a one-way valve is provided on the curved panel close to the extrusion plate, which allows water to flow out of the folding water suction box; and the second sliding pipe is fixedly connected to the adjacent folding water suction box.

[0011] Furthermore, the two ends of the extrusion cylinder are respectively fixedly connected with a first closed ring and a second closed ring, the outer side of the first closed ring is provided with a first step groove, and the outer side of the second closed ring is provided with a second step groove; the first step groove and the second step groove are sealed and rotatably connected to the end of the corresponding extrusion cylinder.

[0012] Furthermore, a first thread groove is provided on one side of the second closed ring, an extension tube is threadedly connected to the first thread groove, a connecting hole is opened in the middle of the extension tube, and the core rod is slidably connected to the connecting hole; a second thread groove is provided at one end of the extension tube away from the transparent liquid-absorbing tube.

[0013] Furthermore, a third thread groove is formed at one end of the core rod away from the first sponge body, a threaded rod is threadedly connected to the third thread groove, and the threaded rod is fixedly connected to the push plate.

[0014] Furthermore, a return spring is sleeved on the core rod, and two ends of the return spring are fixedly connected to the push plate and the extension tube respectively.

[0015] Furthermore, when the first sponge body extends out of the extrusion cylinder, the return spring is compressed.

[0016] Furthermore, a conical slide is fixedly provided at one end of the core rod close to the first sponge body, one end of the conical slide is fixedly connected to a mounting rod, and one end of the first sponge body is fixedly connected to the mounting rod.

[0017] The present invention also claims a method for aspirating subretinal fluid using the sponge-based visualized subretinal fluid aspiration device, comprising the following steps:

[0018] S1. When liquid absorption is required, the core rod is pushed to make the first sponge extend out of the extrusion cylinder to absorb liquid. When the first sponge is saturated, the core rod is pulled back, and the first sponge enters the extrusion cylinder. Under the extrusion action of the extrusion spring, the extrusion plate squeezes the liquid out of the first sponge;

[0019] S2, rotating the extrusion cylinder to make the extrusion cylinder and the transparent liquid-absorbing cylinder rotate relative to each other until the second slide tube and the first slide tube are arranged vertically, so that the liquid flows into the foldable water-absorbing box;

[0020] S3, push the core rod to continue to absorb liquid, the extrusion plate is opened by the core rod, driving the second slide tube to slide and squeeze the folding water absorption box, so that the liquid of the second sponge body in the folding water absorption box is squeezed out and flows into the transparent liquid absorption cylinder and the extrusion cylinder through the one-way valve.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention can realize repeated liquid absorption operation of the first sponge and visualized operation of the liquid through the cooperation of the first sponge, the foldable water suction box and the squeezing mechanism, so as to facilitate the operator to timely monitor the absorption saturation of the liquid and avoid secondary injury caused by liquid reflux; specifically, when the first sponge is saturated with liquid, the squeezing plate of the squeezing mechanism is used to squeeze and discharge the liquid, and the liquid is discharged into the foldable water suction box for liquid storage, thereby realizing repeated liquid absorption operation of the first sponge; at the same time, when the first sponge extends out of the squeezing tube to continue the liquid absorption operation, the squeezing plate reversely squeezes the foldable water suction box through the second sliding tube, so that the second sponge in the water suction box is squeezed and the liquid flows from the one-way valve to between the transparent liquid absorption tube and the squeezing tube, thereby realizing visualized operation of the liquid, thereby facilitating the operator to timely monitor the absorption saturation of the liquid and avoid secondary injury caused by liquid reflux.

[0023] (2) The present invention cooperates with the folding water suction box and the first sliding tube and the second sliding tube. When the first sponge is saturated with liquid, the first sponge extends into the interior of the extrusion cylinder and squeezes the first sponge under the action of the extrusion spring, so that the liquid in the first sponge is discharged. At this time, the first water hole is connected to the second water hole, and the folding water suction box is in an open state. The liquid flows into the first water hole and the second water hole by gravity, and enters the folding water suction box through the second sliding tube to be stored by the second sponge, thereby realizing the repeated liquid absorption operation of the first sponge; at the same time, when the first sponge extends out of the extrusion cylinder to continue the liquid absorption operation, the two extrusion plates are opened by the limiting of the core rod, the first water hole and the second water hole are staggered and closed, and the second sliding tube is driven to slide and squeeze the folding water suction box, so that the liquid of the second sponge in the folding water suction box is squeezed out. At this time, the folding water suction box is already in a closed state. After being squeezed, the liquid can only flow out from the one-way valve into the transparent liquid absorption cylinder and the extrusion cylinder, thereby realizing the visual operation of the liquid, which is convenient for the operator to monitor the liquid absorption saturation in time.

[0024] (3) The present invention adopts a structural design in which the first closed ring and the second closed ring are sealed and rotatably connected to the ends of the corresponding extrusion cylinder, which can not only make the liquid completely flow into the first water hole and the second water hole, but also further avoid the problem of secondary injury caused by the backflow of the squeezed liquid, and at the same time reduce the movement of the suction device relative to the eye, thereby avoiding damage to the eye; specifically, when the first sponge is squeezed to discharge liquid, since the second slide tube is not always in a vertical state during operation, there is a possibility that the liquid cannot completely flow into the first water hole and the second water hole. At this time, by rotating the extrusion cylinder, the extrusion cylinder and the transparent liquid-absorbing cylinder are Relative rotation until the second sliding tube and the first sliding tube are vertically arranged, so that the liquid can flow smoothly into the foldable water suction box; because the foldable water suction box will be in an instantaneous negative pressure state when it is opened, until the first water hole is connected to the second water hole, the instantaneous negative pressure state will accelerate the liquid to enter the first water hole and the second water hole, thereby further making the liquid completely flow into the first water hole and the second water hole, further avoiding the problem of secondary injury caused by the backflow of the squeezed liquid; at the same time, this process only requires the rotation of the extrusion cylinder, and the transparent liquid suction cylinder does not rotate, thereby reducing the movement of the suction device relative to the eyes, avoiding damage to the eyes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a fluid aspiration device for visualizing subretinal fluid aspiration based on a sponge according to the present invention;

[0026] Figure 2 This is a schematic diagram of the overall structure of a sponge-based visualized subretinal fluid aspiration device of the present invention;

[0027] Figure 3 Schematic diagram of the dispersed structure of a sponge-based visual subretinal fluid aspiration device of the present invention Figure 1 ;

[0028] Figure 4 Schematic diagram of the squeezing tube structure of a sponge-based visual subretinal fluid aspiration device of the present invention Figure 1 ;

[0029] Figure 5 Schematic diagram of the squeezing tube structure of a sponge-based visual subretinal fluid aspiration device of the present invention Figure 2 ;

[0030] Figure 6 A schematic diagram of the partial structure of a sponge-based visual subretinal fluid aspiration device of the present invention Figure 1 ;

[0031] Figure 7 This is a schematic diagram of the internal structure of a sponge-based visualized subretinal fluid aspiration device of the present invention;

[0032] Figure 8 Schematic diagram of the dispersed structure of a sponge-based visual subretinal fluid aspiration device of the present invention Figure 2 .

[0033] The reference numerals are as follows:

[0034] 100-transparent liquid pipette, 200-extension tube, 210-second threaded groove, 220-connecting hole, 300-core rod, 310-third threaded groove, 320-conical slide, 330-mounting rod, 400-push plate, 410-reset spring, 420-threaded rod, 500-extrusion tube, 510-extrusion cylinder, 511-first slide tube, 512-first water hole, 520-first closed ring, 521-first stepped groove, 530-second closed ring, 531-second stepped groove, 540-first threaded groove, 600-first sponge, 700-extrusion mechanism, 710-extrusion plate, 720-second water hole, 730-second slide tube, 740-extrusion spring, 900-folding water suction box, 910-curved plate, 920-folding sleeve, 930-check valve. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0036] Although the steps in the present invention are arranged with numbers, they are not used to limit the order of the steps. Unless the order of the steps is clearly stated or the execution of a certain step requires other steps as a basis, the relative order of the steps can be adjusted. It is understood that the term "and / or" used in this article involves and covers any and all possible combinations of one or more of the associated listed items.

[0037] Example

[0038] like Figures 1 to 8 As shown, a visual subretinal fluid suction device based on sponge includes a transparent suction tube 100, wherein the interior of the transparent suction tube 100 is sealed and rotatably connected to an extrusion tube 500, and the interior of the extrusion tube 500 is slidably connected to a core rod 300, and a first sponge 600 is fixedly installed at one end of the core rod 300;

[0039] The extrusion cylinder 500 includes an extrusion cylinder body 510, and a plurality of through holes are symmetrically opened on the side wall of the extrusion cylinder body 510, and a first slide tube 511 is fixedly connected to the through hole, and the first slide tube 511 on the same side is slidably connected to the extrusion mechanism 700; the extrusion mechanism 700 includes an extrusion plate 710 and a folding water suction box 900 connected by a second slide tube 730, and a second sponge is arranged in the folding water suction box 900; the second slide tube 730 is slidably connected to the first slide tube 511; an extrusion spring 740 is sleeved on the second slide tube 730, and the extrusion spring 740 is located in the extrusion cylinder body 510; the folding water suction box 900 is located between the extrusion cylinder 500 and the transparent liquid-absorbing cylinder 100, and the extrusion plate 710 is located inside the extrusion cylinder 500.

[0040] The present invention can realize repeated liquid absorption operation of the first sponge 600 and visualized operation of the liquid through the cooperation of the first sponge 600, the foldable water suction box 900 and the squeezing mechanism 700, so as to facilitate the operator to timely monitor the absorption saturation of the liquid and avoid secondary damage caused by liquid reflux; specifically, when the first sponge 600 is saturated with liquid, the squeezing plate 710 of the squeezing mechanism 700 is used to squeeze and discharge the liquid, and the liquid is discharged into the foldable water suction box 900 for liquid storage, thereby realizing repeated liquid absorption operation of the first sponge 600; at the same time, when the first sponge 600 extends out of the squeezing cylinder 500 to continue the liquid absorption operation, the squeezing plate 710 reversely squeezes the foldable water suction box 900 through the second sliding tube 730, so that the second sponge in the water suction box 900 is squeezed to make the liquid flow from the one-way valve 930 to between the transparent liquid suction cylinder 100 and the squeezing cylinder 500, thereby realizing visualized operation of the liquid, thereby facilitating the operator to timely monitor the absorption saturation of the liquid and avoid secondary damage caused by liquid reflux; a detailed description will be given later.

[0041] Furthermore, a plurality of first water holes 512 are provided on the first sliding tube 511, and a plurality of second water holes 720 are provided on the second sliding tube 730; when the extrusion plate 710 squeezes the first sponge body 600, the first water holes 512 are connected with the second water holes 720; when the first sponge body 600 extends out of the extrusion tube 500, the first water holes 512 and the second water holes 720 are staggered and closed.

[0042] Furthermore, the folding water suction box 900 includes two curved panels 910, which are fixedly connected via a folding sleeve 920; a one-way valve 930 is provided on the curved panel 910 close to the extrusion plate 710, and the one-way valve 930 allows water to flow out of the folding water suction box 900; the second sliding pipe 730 is fixedly connected to the adjacent folding water suction box 900.

[0043] The present invention cooperates with the folding water absorption box 900 and the first slide tube 511 and the second slide tube 730. When the first sponge 600 is saturated with liquid, the first sponge 600 extends into the interior of the extrusion cylinder 500, and the first sponge 600 is squeezed under the action of the extrusion spring 740, so that the liquid in the first sponge 600 is discharged. At this time, the first water hole 512 is connected with the second water hole 720, and the folding water absorption box 900 is in an open state. The liquid flows into the first water hole 512 and the second water hole 720 by gravity, and enters the folding water absorption box 900 through the second slide tube 730 and is stored in the second sponge 600, thereby achieving the first sponge 60 0 repeated liquid suction operation; at the same time, when the first sponge 600 extends out of the squeezing cylinder 500 to continue the liquid suction operation, the two squeezing plates 710 are opened through the limit of the core rod 300, and the first water hole 512 and the second water hole 720 are staggered and closed, and the second slide tube 730 is driven to slide and squeeze the folding water suction box 900, so that the liquid of the second sponge in the folding water suction box 900 is squeezed out. At this time, the folding water suction box 900 is already in a closed state. After being squeezed, the liquid can only flow out from the one-way valve 930 into between the transparent liquid suction cylinder 100 and the squeezing cylinder 500, thereby realizing the visual operation of the liquid, which is convenient for the operator to monitor the liquid absorption saturation in time.

[0044] It is worth noting that the folding sleeve 920 of the present invention can be an elastic structure, such as a metal folding sleeve, which is convenient for assisting the folding water suction box 900 to be in an open state. It is a conventional design and is not described in detail here. At the same time, the drawings in the description of the present invention do not make specific limitations on the dimensions, and can be flexibly adjusted according to actual conditions.

[0045] Furthermore, the two ends of the extrusion cylinder 510 are respectively fixedly connected with a first closed ring 520 and a second closed ring 530, the outer side of the first closed ring 520 is provided with a first step groove 521, and the outer side of the second closed ring 530 is provided with a second step groove 531; the first step groove 521 and the second step groove 531 are sealed and rotatably connected with the end of the corresponding extrusion cylinder 510.

[0046] The present invention adopts a structural design in which the first closed ring 520 and the second closed ring 530 are sealed and rotatably connected to the end of the corresponding extrusion cylinder 510, which can not only make the liquid completely flow into the first water hole 512 and the second water hole 720, but also further avoid the problem of secondary injury caused by the backflow of the squeezed liquid, and at the same time reduce the movement of the suction device relative to the eye, thereby avoiding damage to the eye; specifically, when the first sponge 600 is squeezed to discharge liquid, since the second slide tube 730 is not always in a vertical state during operation, there is a possibility that the liquid cannot completely flow into the first water hole 512 and the second water hole 720. At this time, by rotating the extrusion cylinder 500, the extrusion cylinder 500 and the transparent liquid-absorbing cylinder 100 are relative to each other. Rotate until the second slide tube 730 and the first slide tube 511 are vertically arranged, so that the liquid can flow smoothly into the foldable water suction box 900; because the foldable water suction box 900 will be in an instantaneous negative pressure state when it is opened, until the first water hole 512 is connected to the second water hole 720, the instantaneous negative pressure state will accelerate the liquid to enter the first water hole 512 and the second water hole 720, thereby further making the liquid completely flow into the first water hole 512 and the second water hole 720, further avoiding the problem of secondary injury caused by the backflow of the squeezed liquid; at the same time, this process only requires the extrusion cylinder 500 to rotate, and the transparent liquid suction cylinder 100 does not rotate, thereby reducing the movement of the suction device relative to the eye, avoiding damage to the eye.

[0047] It is worth noting that the first step groove 521 and the second step groove 531 of the present invention can ensure the sealed rotation connection with the end of the corresponding extrusion cylinder 510 according to the processing accuracy, and can also ensure the sealing performance by conventionally setting a rotating sealing ring. This is an existing conventional technology and will not be described in detail here.

[0048] Furthermore, a first thread groove 540 is provided on one side of the second closed ring 530, and the first thread groove 540 is threadedly connected with an extension tube 200, a connecting hole 220 is provided in the middle of the extension tube 200, and the core rod 300 is slidably connected with the connecting hole 220; a second thread groove 210 is provided at one end of the extension tube 200 away from the transparent liquid-absorbing tube 100. When the subretinal fluid aspiration device needs to be extended, an extension tube 200 is directly added to be inserted into the core rod 300, and then adjacent extension tubes 200 are threadedly connected.

[0049] Furthermore, a third thread groove 310 is formed at one end of the core rod 300 away from the first sponge body 600 , and a threaded rod 420 is threadedly connected to the third thread groove 310 , and the threaded rod 420 is fixedly connected to the push plate 400 .

[0050] Furthermore, a return spring 410 is sleeved on the core rod 300 , and two ends of the return spring 410 are fixedly connected to the push plate 400 and the extension tube 200 respectively.

[0051] Furthermore, when the first sponge 600 extends out of the extrusion cylinder 500, the return spring 410 is compressed.

[0052] When the first sponge 600 has absorbed liquid to a saturated state, the push plate 400 is released, and under the reset of the reset spring 410 , the core rod 300 drives the first sponge 600 to automatically slide in the opposite direction along the inside of the liquid pipette 100 .

[0053] Furthermore, a conical slide 320 is fixedly provided at one end of the core rod 300 close to the first sponge 600, and a mounting rod 330 is fixedly connected to one end of the conical slide 320, and one end of the first sponge 600 is fixedly connected to the mounting rod 330. The structural design of the conical slide 320 facilitates the core rod 300 to squeeze the two extrusion plates 710 apart.

[0054] It is worth noting that the mounting rod 330 and the first sponge body 600 may be reinforced by auxiliary materials such as adhesives, which will not be described in detail here.

[0055] A method for aspirating subretinal fluid using the sponge-based visualized subretinal fluid aspiration device comprises the following steps:

[0056] S1. When liquid absorption is required, the core rod 300 is pushed to make the first sponge 600 extend out of the extrusion cylinder 500 to absorb liquid. When the first sponge 600 is saturated, the core rod 300 is pulled back, and the first sponge 600 enters the extrusion cylinder 500. Under the extrusion action of the extrusion spring 740, the extrusion plate 710 squeezes liquid out of the first sponge 600.

[0057] S2, rotating the extrusion cylinder 500, so that the extrusion cylinder 500 and the transparent liquid-absorbing cylinder 100 rotate relative to each other, until the second slide tube 730 and the first slide tube 511 are arranged vertically, so that the liquid flows into the foldable water-absorbing box 900;

[0058] S3, push the core rod 300 to continue to absorb liquid, the squeezing plate 710 is opened by the core rod 300, driving the second sliding tube 730 to slide and squeeze the folding water suction box 900, so that the liquid in the second sponge body in the folding water suction box 900 is squeezed out and flows into the transparent liquid absorption cylinder 100 and the squeezing cylinder 500 through the one-way valve 930.

[0059] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and changes without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A sponge-based visual subretinal fluid aspiration device, characterized in that: It comprises a transparent liquid-absorbing cylinder (100), wherein the interior of the transparent liquid-absorbing cylinder (100) is sealed and rotatably connected to an extrusion cylinder (500), the interior of the extrusion cylinder (500) is slidably connected to a core rod (300), and a first sponge (600) is fixedly mounted on one end of the core rod (300); The extrusion cylinder (500) comprises an extrusion cylinder body (510), and a plurality of through holes are symmetrically formed on the side wall of the extrusion cylinder body (510), and a first sliding tube (511) is fixedly connected to the through hole, and the first sliding tube (511) on the same side is slidably connected to the extrusion mechanism (700); the extrusion mechanism (700) comprises an extrusion plate (710) and a folding water suction box (900) connected via a second sliding tube (730), and a second sponge is arranged in the folding water suction box (900); the second sliding tube (730) is slidably connected to the first sliding tube (511); an extrusion spring (740) is sleeved on the second sliding tube (730), and the extrusion spring (740) is located in the extrusion cylinder body (510); the folding water suction box (900) is located between the extrusion cylinder (500) and the transparent liquid-absorbing cylinder (100), and the extrusion plate (710) is located inside the extrusion cylinder (500).

2. A sponge-based visualized subretinal fluid aspiration device according to claim 1, characterized in that: The first sliding tube (511) is provided with a plurality of first water holes (512), and the second sliding tube (730) is provided with a plurality of second water holes (720); when the extrusion plate (710) squeezes the first sponge body (600), the first water holes (512) are connected with the second water holes (720); when the first sponge body (600) extends out of the extrusion cylinder (500), the first water holes (512) and the second water holes (720) are staggered and closed.

3. According to claim 1, a sponge-based visualized subretinal fluid aspiration device is characterized in that: The folding water suction box (900) comprises two curved panels (910), which are fixedly connected via a folding sleeve (920); a one-way valve (930) is provided on the curved panel (910) close to the extrusion plate (710), and the one-way valve (930) allows water to flow out of the folding water suction box (900); and the second sliding pipe (730) is fixedly connected to an adjacent folding water suction box (900).

4. A sponge-based visualized subretinal fluid aspiration device according to claim 1, characterized in that: The two ends of the extrusion cylinder (510) are respectively fixedly connected with a first closed ring (520) and a second closed ring (530); the outer side of the first closed ring (520) is provided with a first stepped groove (521), and the outer side of the second closed ring (530) is provided with a second stepped groove (531); the first stepped groove (521) and the second stepped groove (531) are sealingly rotatably connected to the ends of the corresponding extrusion cylinder (510).

5. A sponge-based visualized subretinal fluid aspiration device according to claim 4, characterized in that: A first thread groove (540) is provided on one side of the second closed ring (530), and the first thread groove (540) is threadedly connected to an extension tube (200). A connecting hole (220) is provided in the middle of the extension tube (200), and the core rod (300) is slidably connected to the connecting hole (220); a second thread groove (210) is provided at one end of the extension tube (200) away from the transparent liquid-absorbing tube (100).

6. A sponge-based visualized subretinal fluid aspiration device according to claim 5, characterized in that: A third thread groove (310) is formed at one end of the core rod (300) away from the first sponge body (600), and a threaded rod (420) is threadedly connected to the third thread groove (310), and the threaded rod (420) is fixedly connected to the push plate (400).

7. A sponge-based visualized subretinal fluid aspiration device according to claim 6, characterized in that: The core rod (300) is sleeved with a return spring (410), and two ends of the return spring (410) are respectively fixedly connected to the push plate (400) and the extension tube (200).

8. The sponge-based visualized subretinal fluid aspiration device according to claim 7, characterized in that: When the first sponge (600) extends out of the extrusion cylinder (500), the return spring (410) is compressed.

9. The sponge-based visualized subretinal fluid aspiration device according to claim 1, characterized in that: A conical slide (320) is fixedly provided at one end of the core rod (300) close to the first sponge (600), one end of the conical slide (320) is fixedly connected to a mounting rod (330), and one end of the first sponge (600) is fixedly connected to the mounting rod (330).

10. A method for aspirating subretinal fluid using the sponge-based visualized subretinal fluid aspiration device according to any one of claims 1 to 9, characterized in that: The steps include: S1. When liquid absorption is required, the core rod (300) is pushed to make the first sponge (600) extend out of the extrusion cylinder (500) to absorb liquid. When the first sponge (600) is saturated, the core rod (300) is pulled back, and the first sponge (600) enters the extrusion cylinder (500). Under the extrusion action of the extrusion spring (740), the extrusion plate (710) squeezes liquid out of the first sponge (600); S2, rotating the extrusion cylinder (500) to make the extrusion cylinder (500) and the transparent liquid-absorbing cylinder (100) rotate relative to each other until the second slide tube (730) and the first slide tube (511) are arranged vertically, so that the liquid flows into the foldable water-absorbing box (900); S3, the core rod (300) is pushed to continue to absorb the liquid, and the squeezing plate (710) is opened by the core rod (300), driving the second sliding tube (730) to slide and squeeze the folding water absorption box (900), so that the liquid in the second sponge body in the folding water absorption box (900) is squeezed out and flows into the transparent liquid absorption cylinder (100) and the squeezing cylinder (500) through the one-way valve (930).

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