Subretinal fluid aspiration device

Abstract

The present invention belongs to the technical field of medical devices, and specifically relates to a subretinal fluid suction device. It includes a pipette, a core rod is slidably connected inside the pipette, a first sponge is fixedly installed at one end of the core rod, the first sponge passes through one end of the pipette and is arranged outward; an extension tube is threadedly connected to the end of the pipette away from the first sponge, a push plate is threadedly connected to the end of the core rod away from the first sponge, a first spring is sleeved on the core rod, and the two ends of the first spring are respectively in contact with the extension tube and the push plate; an extrusion mechanism is installed in the pipette for squeezing the first sponge. The present invention avoids the situation that the retina is sucked and causes secondary damage when sucked by conventional negative pressure suction; and the present invention realizes multiple suction of the first sponge, improving the efficiency of subretinal fluid suction; the present invention avoids the suctioned liquid from flowing back to the retina.

Description

Technical Field

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

[0002] Retinal detachment is the separation of the neural epithelium and the pigment epithelium of the retina. There is a potential gap between the two layers. The fluid retained in the gap after separation is called subretinal fluid. If not treated in time, it may lead to severe vision loss or even blindness. Rhegmatogenous retinal detachment is one of the common types of retinal detachment. Its onset depends on three factors, namely retinal tears, vitreous liquefaction, and sufficient tension to separate the retina from the pigment epithelium. Retinal tears are the key to the onset of rhegmatogenous retinal detachment. Posterior approach vitrectomy and retinal reattachment is a conventional surgical method for the treatment of rhegmatogenous retinal detachment. During the operation, draining the subretinal fluid and closing the retinal tears are the keys to the success of the operation.

[0003] Retinal laser photocoagulation and / or retinal cryosurgery are usually combined during surgery to close retinal tears. 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 retinal tears and improve the success rate of the surgery.

[0004] The Chinese patent application number 201420036197.X discloses a double-chamber suction and injection tube with illumination for draining subretinal fluid through the internal route in ophthalmic retinal detachment reattachment surgery, comprising a cylindrical handle, wherein the handle is provided with a first through hole, a second through hole and a third through hole along the axial direction, wherein the first through hole and the second through hole are respectively provided with a suction tube and an injection tube extending out of the outer end of the handle at both ends, and the third through hole is provided with an illumination optical fiber. The double-chamber suction and injection tube structure of the patent can realize that only one incision is needed to complete the lighting and surgical operation tasks during surgery, and the injection of viscoelastic agent and the suction of subretinal fluid are performed simultaneously, and there is no need to inject heavy water during surgery, which significantly shortens the operation time and postoperative recovery time.

[0005] At present, the commonly used methods for draining subretinal fluid are: using the pressure difference between the intraocular perfusion pressure and the extraocular atmospheric pressure to drain the subretinal fluid through a flute needle tube under gas perfusion combined with heavy water extrusion; or using the vitrectomy head to suck out the subretinal fluid by negative pressure suction. The two methods have obvious disadvantages, mainly: 1. During the process of tube suction, the tube mouth is very likely to accidentally suck out the detached retina, causing iatrogenic retinal damage, and the need to repeatedly handle the incarcerated retina during the operation increases the difficulty of the operation and prolongs the operation time; 2. Heavy water is required to assist retinal reattachment during the operation, which increases the cost of surgical materials, increases the number of surgical steps, prolongs the operation time, and there is a surgical risk of residual heavy water. If a soft absorbent sponge is designed to suck out subretinal fluid, iatrogenic retinal damage can be avoided, the difficulty of the operation can be reduced, and the operation time can be shortened; it may reduce the use rate of heavy water-assisted retinal reattachment, reduce medical costs, and reduce intraoperative complications. Since the built-in sponges of minimally invasive instruments have limited fluid absorption capacity and need to be replaced repeatedly, the complexity of the operation is increased, resulting in higher surgical costs and risks. If a convenient and fast reusable absorbent sponge device is designed, it will further reduce the difficulty and risk of the operation and improve surgical efficiency. Summary of the invention

[0006] In order to solve the deficiencies in the prior art, the present invention provides a subretinal fluid suction device, which avoids the situation in which the retina is sucked and causes secondary damage when suctioned by conventional negative pressure suction; moreover, the present invention realizes multiple suctions of the first spongy body, thereby improving the efficiency of subretinal fluid suction; the present invention, through the cooperation of the squeezing mechanism and the pipette cylinder, can not only perform repeated suction operations, but also store fluid, thereby achieving sufficient discharge of the fluid and preventing the sucked fluid from flowing back under the retina; the present invention improves the adaptability of the subretinal fluid suction device.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A subretinal fluid suction device comprises a suction cylinder, wherein a core rod is slidably connected inside the suction cylinder, a first sponge is fixedly mounted on one end of the core rod, the first sponge passes through one end of the suction cylinder and is arranged outward; an extension cylinder is threadedly connected to one end of the suction cylinder away from the first sponge, a push plate is threadedly connected to one end of the core rod away from the first sponge, a first spring is sleeved on the core rod, and the two ends of the first spring are respectively abutted against the extension cylinder and the push plate; an extrusion mechanism is installed in the suction cylinder for extruding the first sponge.

[0009] Further, the liquid pipette comprises an outer tube and an inner tube, a first notch is connected in the middle of one end of the inner tube, an end of the outer tube and the first notch are closed and connected to an end head, a second notch is opened in the middle of the end head, and the first notch is correspondingly connected to the second notch;

[0010] The outside of the inner tube is fixedly connected to two isolation mesh plates, which divide the space between the outer tube and the inner tube into two liquid storage tanks and two liquid drainage tanks. The liquid drainage tank is located between the two isolation mesh plates; a second sponge is inserted in the liquid storage tank.

[0011] Furthermore, there are two extrusion mechanisms, which are respectively installed in corresponding drainage grooves; the extrusion mechanism includes an extrusion plate and a drainage arc plate, the extrusion plate is located inside the inner tube, and the drainage arc plate is located inside the drainage groove; the extrusion plate and the drainage arc plate are fixedly connected by multiple sliding rods, and the sliding rods pass through the inner tube; a second spring is sleeved on the sliding rod, and the two ends of the second spring are respectively fixedly connected to the extrusion plate and the inner tube.

[0012] Furthermore, an adjustment plate is fixedly provided at one end of the drainage arc plate, two groups of water holes are symmetrically opened at one end of the inner tube close to the first slot, and a connecting groove is opened on the adjustment plate; when the extrusion plate does not squeeze the first sponge body, the adjustment plate is sealed and fitted with the corresponding water hole; when the extrusion plate squeezes the first sponge body, the two ends of the connecting groove are respectively connected with the water hole and the drainage groove.

[0013] Furthermore, the end cap is a cone structure.

[0014] Furthermore, one end of the pipette cylinder away from the end head is fixedly connected to a first end cap by a screw, and the first end cap closes the inner cylinder and the drainage groove; a first connecting hole is opened in the middle of the first end cap, and the core rod passes through the first connecting hole and extends into the interior of the inner cylinder; a first threaded groove is provided on one side of the first end cap, and one end of the extension cylinder is provided with a thread, and the first threaded groove is threadedly connected to one end of the extension cylinder.

[0015] Furthermore, a second communication hole is opened in the middle of the extension tube, and the core rod passes through the second communication hole; and a second thread groove is provided at one end of the extension tube away from the liquid-absorbing tube.

[0016] Furthermore, a socket is provided at one end of the liquid storage tank away from the end head, a second end cover is plugged into the socket, and the second end cover closes the liquid storage tank.

[0017] 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, one end of the first sponge body is provided with a mounting groove, and the mounting rod is inserted into the mounting groove and fixedly connected to the mounting groove.

[0018] Furthermore, a third thread groove is formed at one end of the core rod away from the first sponge body, a thread rod is fixedly formed at one side of the push plate, and the third thread groove is threadedly connected to the thread rod.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The present invention first extends the subretinal fluid suction device into the area where the retinal tear is located through the instrument channel, and then pushes the push plate to make the core rod slide along the inside of the suction tube to push out the first sponge, so that the first sponge absorbs the fluid under the retina, avoiding the situation where the retina is sucked and causes secondary damage due to suction by conventional negative pressure suction; and, after the first sponge of the present invention absorbs a certain amount of liquid to form a saturated state, the push plate is released, and the core rod slides in the opposite direction along the inside of the suction tube under the reset of the first spring, so that the first sponge returns to the inside of the suction tube, is squeezed and discharged by the squeezing mechanism, and then the suction operation is repeated, thereby achieving multiple suctions by the first sponge and improving the subretinal fluid suction efficiency.

[0021] (2) The present invention adopts a structural design of the squeezing mechanism. When the push plate is pushed, the core rod pushes the first sponge out. At this time, the core rod is located between the two squeezing plates to limit the squeezing plates. When the first sponge absorbs liquid to a saturated state, the push plate is released. Under the reset of the first spring, the core rod drives the first sponge to slide in the opposite direction inside the liquid-absorbing tube. When the core rod leaves the squeezing plate and releases the limit on the squeezing plate, under the reset of the second spring, the two squeezing plates are driven to squeeze the first sponge to discharge the absorbed liquid, thereby realizing the repeated liquid absorption operation of the first sponge.

[0022] (3) The present invention can not only perform repeated suction operations but also store liquid through the cooperation of the squeezing mechanism and the liquid pipette, thereby preventing the sucked liquid from flowing back under the retina. Specifically, when the two squeezing plates squeeze the first sponge to discharge the absorbed liquid, the regulating plate moves with the drainage arc plate, so that the two ends of the connecting groove of the regulating plate are connected with the water hole and the liquid drainage groove respectively. At this time, the liquid flowing out of the first sponge first flows into the inner cylinder, and then flows into the liquid drainage groove through the water hole. After entering the liquid drainage groove, part of the liquid enters the isolation mesh plate and is absorbed by the second sponge. Thus, a liquid storage operation is performed, and part of the liquid flows into the bottom of the drainage groove; when the push plate is pushed to make the core rod slide along the inside of the liquid absorption tube, the core rod squeezes the two squeezing plates apart, and brings the first spongy body out of the liquid absorption tube, thereby realizing repeated liquid absorption of the first spongy body, and when the two squeezing plates are squeezed apart, the drainage arc plate is driven by the sliding rod to move toward the wall of the outer tube, so that part of the liquid in the drainage groove is squeezed outward, and the liquid is squeezed into the isolation mesh plates on both sides, so that it is absorbed by the second spongy body, thereby realizing full discharge of the liquid, thereby preventing the absorbed liquid from flowing back under the retina.

[0023] (4) The present invention adopts the structural design of the extension tube. When the subretinal fluid absorption device needs to be extended, the extension tube is directly added and inserted into the core rod. Then, the adjacent extension tubes are threadedly connected. The length of the subretinal fluid absorption device can be actually increased or decreased according to different patients and actual surgical conditions. In addition, a third thread groove is provided at one end of the core rod away from the first cavernous body, which can also be correspondingly increased according to the adjustment of the extension tube, thereby improving the adaptability of the subretinal fluid absorption device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of water absorption of a subretinal fluid aspiration device according to the present invention;

[0025] Figure 2 It is a schematic diagram of the overall structure of a subretinal fluid aspiration device of the present invention;

[0026] Figure 3 It is a cross-sectional schematic diagram of a subretinal fluid aspiration device of the present invention;

[0027] Figure 4 A schematic diagram of the dispersed structure of a subretinal fluid aspiration device of the present invention Figure 1 ;

[0028] Figure 5 This is a schematic diagram of the internal structure of a subretinal fluid aspiration device of the present invention;

[0029] Figure 6 This is a schematic diagram of the first end cover structure of a subretinal fluid aspiration device of the present invention;

[0030] Figure 7 A schematic diagram of the dispersed structure of a subretinal fluid aspiration device of the present invention Figure 2 ;

[0031] Figure 8 This is a schematic diagram of the structure of an extrusion mechanism of a subretinal fluid aspiration device of the present invention;

[0032] Fig. 9 A schematic diagram of the dispersed structure of a subretinal fluid aspiration device of the present invention Figure 3 .

[0033] The reference numerals are as follows:

[0034] Liquid suction cylinder-100; outer cylinder-110; socket-111; inner cylinder-120; water hole-121; first notch-122; isolation mesh plate-130; liquid drainage groove-140; liquid storage groove-150; end-160; second notch-161; extension cylinder-200; second thread groove-210; second connecting hole-220; core rod-300; third thread groove-310; conical slide-320; mounting rod-330 ; Push plate-340; Threaded rod-341; First spring-400; First end cover-500; First connecting hole-510; First threaded groove-520; First sponge-600; Mounting groove-610; Extrusion mechanism-700; Extrusion plate-710; Drainage arc plate-720; Sliding rod-730; Second spring-740; Adjustment plate-750; Connecting groove-751; Second end cover-800; Second sponge-900. 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 9 As shown, a subretinal fluid suction device includes a pipette cylinder 100, in which a core rod 300 is slidably connected, and a first sponge 600 is fixedly installed at one end of the core rod 300, and the first sponge 600 passes through one end of the pipette cylinder 100 and is arranged outward; an extension tube 200 is threadedly connected to one end of the pipette cylinder 100 away from the first sponge 600, and a push plate 340 is threadedly connected to one end of the core rod 300 away from the first sponge 600, and a first spring 400 is sleeved on the core rod 300, and the two ends of the first spring 400 are respectively abutted against the extension tube 200 and the push plate 340; an extrusion mechanism 700 is installed in the pipette cylinder 100 for squeezing the first sponge 600.

[0039] The present invention first extends the subretinal fluid suction device into the area where the retinal tear is located through the instrument channel, and then pushes the push plate 340 to make the core rod 300 slide along the inside of the liquid pipette 100, and pushes out the first sponge 600, so that the first sponge 600 can absorb the liquid under the retina, avoiding the situation that the retina is sucked and causes secondary damage by sucking by conventional negative pressure suction; and after the first sponge 600 of the present invention absorbs a certain amount of liquid to form a saturated state, the push plate 340 is released, and the core rod 300 slides in the opposite direction along the inside of the liquid pipette 100 under the reset of the first spring 400, so that the first sponge 600 returns to the inside of the liquid pipette 100, and is squeezed and discharged by the squeezing mechanism 700, and then the liquid suction operation is repeated, so that the first sponge 600 is sucked multiple times, and the subretinal fluid suction efficiency is improved. The present invention can realize the suction and discharge operations by one-handed operation, which is convenient to operate and reduces the risks of surgical operations.

[0040] It is worth noting that the schematic diagram of the subretinal fluid aspiration device of the present invention does not represent a specific size, and does not specifically limit the size of the device.

[0041] Further, the liquid pipette 100 comprises an outer tube 110 and an inner tube 120, a first notch 122 is provided in the middle of one end of the inner tube 120, one end of the outer tube 110 and the first notch 122 are jointly sealed and connected with a terminal 160, a second notch 161 is provided in the middle of the terminal 160, and the first notch 122 is correspondingly connected with the second notch 161; the first sponge 600 can extend out of the liquid pipette 100 through the first notch 122 and the second notch 161;

[0042] The outer part of the inner cylinder 120 is fixedly connected with two isolation mesh plates 130, and the two isolation mesh plates 130 divide the space between the outer cylinder 110 and the inner cylinder 120 into two liquid storage tanks 150 and two liquid drainage tanks 140, and the liquid drainage tank 140 is located between the two isolation mesh plates 130; the second sponge 900 is inserted into the liquid storage tank 150. The second sponge 900 is used to store liquid, which will be described in detail later.

[0043] Furthermore, there are two extrusion mechanisms 700, which are respectively installed in the corresponding drainage grooves 140; the extrusion mechanism 700 includes an extrusion plate 710 and a drainage arc plate 720, the extrusion plate 710 is located inside the inner tube 120, and the drainage arc plate 720 is located inside the drainage groove 140; the extrusion plate 710 and the drainage arc plate 720 are fixedly connected by multiple sliding rods 730, and the sliding rods 730 pass through the inner tube 120; a second spring 740 is sleeved on the sliding rod 730, and the two ends of the second spring 740 are respectively fixedly connected to the extrusion plate 710 and the inner tube 120.

[0044] The present invention adopts the structural design of the squeezing mechanism 700. When the push plate 340 is pushed, the core rod 300 pushes the first sponge 600 out. At this time, the core rod 300 is located between the two squeezing plates 710 to limit the squeezing plates 710. When the first sponge 600 absorbs liquid to a saturated state, the push plate 340 is released. Under the reset of the first spring 400, the core rod 300 drives the first sponge 600 to slide in the opposite direction inside the liquid pipette 100. When the core rod 300 leaves the squeezing plate 710 to release the limit on the squeezing plate 710, under the reset of the second spring 740, the two squeezing plates 710 are driven to squeeze the first sponge 600 to discharge the absorbed liquid, thereby realizing the repeated liquid absorption operation of the first sponge 600.

[0045] Furthermore, an adjustment plate 750 is fixedly provided at one end of the drainage arc plate 720, and two groups of water holes 121 are symmetrically opened at one end of the inner tube 120 close to the first notch 122, and a connecting groove 751 is opened on the adjustment plate 750; when the extrusion plate 710 does not squeeze the first sponge body 600, the adjustment plate 750 is sealed and fitted with the corresponding water hole 121; when the extrusion plate 710 squeezes the first sponge body 600, the two ends of the connecting groove 751 are respectively connected with the water hole 121 and the drainage groove 140.

[0046] The present invention can not only perform repeated suction operations but also store liquid through the cooperation of the squeezing mechanism 700 and the liquid pipette 100 to prevent the sucked liquid from flowing back under the retina. Specifically, when the two squeezing plates 710 squeeze the first sponge 600 to discharge the absorbed liquid, the regulating plate 750 moves with the drainage arc plate 720, so that the two ends of the connecting groove 751 of the regulating plate 750 are connected with the water hole 121 and the liquid drainage groove 140 respectively. At this time, the liquid flowing out of the first sponge 600 first flows into the inner cylinder 120, and then flows into the liquid drainage groove 140 through the water hole 121. After entering the liquid drainage groove 140, part of the liquid enters the isolation mesh plate 130 and is absorbed by the second sponge 900, thereby The liquid storage operation is performed, and part of the liquid flows into the bottom of the drainage groove 140; when the push plate 340 is pushed to make the core rod 300 slide along the inside of the liquid pipette 100, the core rod 300 squeezes the two squeezing plates 710 apart, and brings the first sponge 600 out of the liquid pipette 100, so as to realize repeated liquid absorption of the first sponge 600, and when the two squeezing plates 710 are squeezed apart, the drainage arc plate 720 is driven by the sliding rod 730 to move toward the wall of the outer tube 110, so that part of the liquid in the drainage groove 140 is squeezed out, and the liquid is squeezed into the isolation mesh plates 130 on both sides, so that part of the liquid is also absorbed by the second sponge 900, so as to realize the full discharge of the liquid, thereby preventing the absorbed liquid from flowing back under the retina.

[0047] The connecting groove 751 may be in an arc-shaped structure, so that the liquid flowing out of the first sponge 600 can quickly flow into the drainage groove 140 through the water holes 121, thereby increasing the drainage speed.

[0048] Furthermore, the end 160 is a cone structure, which facilitates the subretinal fluid aspiration device to perform surgical operations without causing damage to the retina.

[0049] Furthermore, one end of the pipette cylinder 100 away from the end head 160 is fixedly connected to a first end cap 500 by means of screws, and the first end cap 500 closes the inner cylinder 120 and the drainage groove 140; a first connecting hole 510 is opened in the middle of the first end cap 500, and the core rod 300 passes through the first connecting hole 510 and extends into the interior of the inner cylinder 120; a first thread groove 520 is provided on one side of the first end cap 500, and one end of the extension cylinder 200 is provided with a thread, and the first thread groove 520 is threadedly connected to one end of the extension cylinder 200.

[0050] Furthermore, a second connecting hole 220 is opened in the middle of the extension tube 200 , and the core rod 300 passes through the second connecting hole 220 ; and a second thread groove 210 is formed at one end of the extension tube 200 away from the liquid pipette tube 100 .

[0051] The present invention adopts the structural design of the extension tube 200. When the subretinal fluid aspiration device needs to be extended, the extension tube 200 is directly added to the core rod 300, and then the adjacent extension tubes 200 are threadedly connected. The length of the subretinal fluid aspiration device can be actually increased or decreased according to different patients and actual surgical conditions.

[0052] Furthermore, the end of the liquid storage tank 150 away from the end head 160 is provided with a socket 111, and the socket 111 is plugged with a second end cap 800, and the second end cap 800 closes the liquid storage tank 150. The second sponge 900 can be easily replaced by plugging the second end cap 800 with the socket 111.

[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. A mounting groove 610 is provided at one end of the first sponge 600, and the mounting rod 330 is inserted into the mounting groove 610 and fixedly connected to the mounting groove 610. 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 mounting groove 610 of the first sponge 600 can be reinforced by auxiliary materials such as adhesives, which will not be described in detail. In addition, the first sponge 600 can be completely pushed out of the liquid suction cylinder 100 to facilitate the replacement of the first sponge 600.

[0055] Furthermore, a third thread groove 310 is formed at one end of the core rod 300 away from the first sponge 600, a threaded rod 341 is fixedly formed at one side of the push plate 340, and the third thread groove 310 is threadedly connected to the threaded rod 341. Through the design of the third thread groove 310, the length of the core rod 300 can be correspondingly increased according to the adjustment of the extension tube 200, thereby improving the adaptability of the subretinal fluid aspiration device.

[0056] 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 subretinal fluid aspiration device, characterized in that: The invention comprises a liquid pipette (100), wherein a core rod (300) is slidably connected inside the liquid pipette (100), a first sponge (600) is fixedly mounted on one end of the core rod (300), and the first sponge (600) passes through one end of the liquid pipette (100) and is arranged outward; an extension tube (200) is threadedly connected to one end of the liquid pipette (100) away from the first sponge (600), a push plate (340) is threadedly connected to one end of the core rod (300) away from the first sponge (600), a first spring (400) is sleeved on the core rod (300), and two ends of the first spring (400) are respectively in contact with the extension tube (200) and the push plate (340); The liquid suction cylinder (100) is provided with a squeezing mechanism (700) for squeezing the first sponge (600); The liquid pipette (100) comprises an outer tube (110) and an inner tube (120); a first notch (122) is provided in the middle of one end of the inner tube (120); an end of the outer tube (110) and the first notch (122) are jointly and sealedly connected to an end head (160); a second notch (161) is provided in the middle of the end head (160); the first notch (122) and the second notch (161) are correspondingly connected; Two isolation mesh plates (130) are fixedly connected to the outside of the inner cylinder (120); the two isolation mesh plates (130) divide the space between the outer cylinder (110) and the inner cylinder (120) into two liquid storage grooves (150) and two liquid drainage grooves (140); the liquid drainage grooves (140) are located between the two isolation mesh plates (130); a second sponge (900) is inserted into the liquid storage groove (150); There are two squeezing mechanisms (700), which are respectively installed in corresponding drainage grooves (140); the squeezing mechanism (700) comprises a squeezing plate (710) and a drainage arc plate (720); the squeezing plate (710) is located inside the inner cylinder (120), and the drainage arc plate (720) is located inside the drainage groove (140); the squeezing plate (710) and the drainage arc plate (720) are fixedly connected via a plurality of sliding rods (730), and the sliding rods (730) pass through the inner cylinder (120); a second spring (740) is sleeved on the sliding rod (730), and two ends of the second spring (740) are respectively fixedly connected to the squeezing plate (710) and the inner cylinder (120); An adjusting plate (750) is fixedly provided at one end of the drainage arc plate (720); two groups of water holes (121) are symmetrically provided at one end of the inner tube (120) close to the first notch (122); and a connecting groove (751) is provided on the adjusting plate (750); when the squeezing plate (710) does not squeeze the first sponge (600), the adjusting plate (750) is sealed and fitted with the corresponding water holes (121); when the squeezing plate (710) squeezes the first sponge (600), the two ends of the connecting groove (751) are respectively connected with the water holes (121) and the drainage groove (140).

2. A subretinal fluid aspiration device according to claim 1, characterized in that: The end head (160) is a conical structure.

3. A subretinal fluid aspiration device according to claim 1, characterized in that: One end of the liquid pipette (100) away from the end head (160) is fixedly connected to a first end cap (500) by means of screws, and the first end cap (500) closes the inner tube (120) and the liquid drainage groove (140); a first connecting hole (510) is provided in the middle of the first end cap (500), and the core rod (300) passes through the first connecting hole (510) and extends into the interior of the inner tube (120); a first thread groove (520) is provided on one side of the first end cap (500), and one end of the extension tube (200) is provided with a thread, and the first thread groove (520) is threadedly connected to one end of the extension tube (200).

4. A subretinal fluid aspiration device according to claim 3, characterized in that: A second communication hole (220) is provided in the middle of the extension tube (200), and the core rod (300) passes through the second communication hole (220); and a second thread groove (210) is provided at one end of the extension tube (200) away from the liquid suction tube (100).

5. A subretinal fluid aspiration device according to claim 1, characterized in that: An end of the liquid storage tank (150) away from the end head (160) is provided with a socket (111), a second end cover (800) is plugged into the socket (111), and the second end cover (800) closes the liquid storage tank (150).

6. A 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), and a mounting rod (330) is fixedly connected to one end of the conical slide (320). A mounting groove (610) is provided at one end of the first sponge (600), and the mounting rod (330) is inserted into the mounting groove (610) and fixedly connected to the mounting groove (610).

7. A subretinal fluid aspiration device according to claim 1, 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), a threaded rod (341) is fixedly provided on one side of the push plate (340), and the third thread groove (310) is threadedly connected to the threaded rod (341).

Images