A negative pressure conjunctival sac washing device

Abstract

The utility model provides a kind of negative pressure conjunctival sac flushing device, it is related to ophthalmic medical instrument technical field, including empty cylinder, annular holding part and piston body, empty cylinder is hollow cylinder structure and inside is formed with along axial extension liquid-containing cavity, one end of empty cylinder is equipped with the opening being communicated with liquid-containing cavity, other end is closed end, two annular holding parts are symmetrically set on the outer wall along circumferential direction in the position close to empty cylinder opening, piston body is set in the liquid-containing cavity of empty cylinder along empty cylinder axial reciprocating movement. By the cooperation between above-mentioned structure, it has following beneficial effects: first, by the medical check valve set, can use negative pressure suction principle to realize flushing fluid direct suction, save repeated liquid pumping step and improve operation efficiency, while combining with the one-person-one-use mechanism of secondary throw type needle tube, the cross-infection risk caused by multiple people sharing is completely eliminated;Second, the head position of secondary throw type needle tube is designed inverted diaphragm valve, can effectively block liquid reflux pollution flushing fluid and drip waste.

Description

Technical Field

[0001] This utility model relates to the field of ophthalmic medical device technology, and in particular to a conjunctival sac irrigation device. Background Technology

[0002] In ophthalmological clinical diagnosis and treatment, conjunctival sac irrigation is a routine nursing procedure. Its application scenarios cover multiple key aspects such as emergency treatment of chemical ocular trauma, preoperative ocular surface cleaning, and foreign body removal. Currently, the traditional open irrigation mode is still used when performing this procedure in clinical practice. Operators need to be temporarily equipped with a 50 ml syringe, an eyewash pot, a water receiver, physiological saline or neutralizing solution (such as 5% sodium bicarbonate or 3% boric acid solution), topical anesthetic, gauze or cotton swabs. The irrigation solution needs to be temporarily prepared on-site and connected to a sterile infusion set to construct an irrigation system, and suspended on the infusion pole for air removal and standby.

[0003] However, there are significant hidden dangers in the above operation. Due to time constraints, the centrally prepared irrigation solution needs to be recycled among multiple patients in different wards. However, since patients irrigating the conjunctival sac cannot be concentrated, the irrigation solution is frequently transferred, causing the irrigation head to be exposed to an unclean environment, resulting in the risk of residual liquid contamination. This leads to two risks: first, the contaminated liquid is forced to be discarded, resulting in a waste of medical resources; second, if the contaminated irrigation solution is reused, it will increase the probability of eye infection in patients.

[0004] For patients with chemical eye injuries, timely and effective conjunctival sac irrigation is the gold standard intervention to salvage visual function. Therefore, a conjunctival sac irrigation device is needed to solve the above problems. Utility Model Content

[0005] To address the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a negative pressure conjunctival sac irrigation device, which can effectively eliminate the risk of cross-infection and ensure operational safety through the synergistic effect of a closed irrigation system and a negative pressure suction component.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: This utility model provides a negative pressure conjunctival sac irrigation device, including a hollow cylinder, an annular gripping part, and a piston body. The hollow cylinder has a hollow cylindrical structure and an axially extending liquid-containing cavity is formed inside. One end of the hollow cylinder is provided with an opening communicating with the liquid-containing cavity, and the other end is a closed end. Two annular gripping parts are symmetrically arranged circumferentially on the outer wall near the opening of the hollow cylinder. A piston body that reciprocates along the axial direction of the hollow cylinder is provided in the liquid-containing cavity. The device is characterized by further including a nipple that communicates with the liquid-containing cavity at the axial center of the closed end of the hollow cylinder, a negative pressure output part that communicates with the liquid-containing cavity on the nipple, and a negative pressure input part that is radially opposite to the nipple at the closed end of the hollow cylinder.

[0007] In a preferred embodiment, the negative pressure output unit includes a No. 1 medical check valve inserted into the nipple at one end. The outer wall of the other end of the No. 1 medical check valve is provided with a screw-in protrusion and connected to a locking element. A disposable needle tube is detachably connected to the locking element. The disposable needle tube is a hollow tube structure with both ends through it. An inverted diaphragm valve is embedded in the inner wall of the end of the disposable needle tube away from the locking element.

[0008] In the preferred embodiment, the locking component consists of a locking base and a No. 1 pagoda connector. The outer wall of the locking base is provided with anti-slip texture extending in the circumferential direction. The locking base is a cylindrical cavity structure with one end closed and the other end open. The inner wall of the locking base is provided with an internal thread that engages with the screw-in protrusion at one end of the No. 1 medical check valve. The No. 1 pagoda connector has a tapered pagoda-shaped structure. One end face of the No. 1 pagoda connector is coaxially connected to the closed end of the locking base, and the other end is inserted into the inner wall of the secondary-disposable needle tube near the locking part, forming a mechanical engagement.

[0009] In a preferred embodiment, the inner side of the locking base is provided with a multi-layer annular sealing structure, including a side sealing ring that is sleeved on the surface of the internal thread root diameter and has an interference fit with the screw-in protrusion on the outer wall of one end of the No. 1 medical check valve. It also includes a top sealing ring embedded in the locking base near the No. 1 pagoda connector. The top sealing ring has an O-shaped structure and is in face-to-face contact with the end face of the No. 1 medical check valve for sealing.

[0010] In the preferred embodiment, the inverted diaphragm valve consists of an annular base and an elastic diaphragm. The outer peripheral wall of the annular base is fixedly connected to the inner wall of the secondary-disposable needle. The elastic diaphragm is integrally formed with the annular base. The elastic diaphragm is recessed along the axial direction of the secondary-disposable needle towards the locking element to form an umbrella-shaped inverted conical structure. The edge of the elastic diaphragm converges towards the central axis of the secondary-disposable needle to form a normally closed sealing surface.

[0011] In a preferred embodiment, a cross-shaped pre-cut that does not penetrate the elastic film is provided in the central region of the elastic film, forming four elastic lobes distributed at equal angles along the circumference, and the thickness of the four elastic lobes gradually decreases from the root to the end.

[0012] In the preferred embodiment, the depth of the cross-shaped pre-cut is 0.03 to 0.05 mm, the thickness of the root of the elastic flap is 1 / 3 to 1 / 2 of the thickness of the end, and the four elastic flaps are evenly distributed at 90° intervals along the circumference.

[0013] In a preferred embodiment, the negative pressure input unit includes an L-shaped connecting tube located at the closed end of the empty cylinder and radially opposite to the nipple. One end of the L-shaped connecting tube is connected to the liquid chamber of the empty cylinder, and the other end is connected to a No. 2 medical check valve. A flexible tube is connected to the end of the No. 2 medical check valve away from the L-shaped connecting tube, and a bottle stopper puncturist is connected to the other end of the flexible tube.

[0014] In the preferred embodiment, the bottle stopper puncture device includes a second pagoda connector, a fixing plate, and a puncture needle, which are coaxially fixed from left to right. The second pagoda connector has a tapered pagoda-shaped structure. The tapered end of the second pagoda connector is inserted into the inner wall of one end of the tubing to form a mechanical engagement. The expanding end of the second pagoda connector is fixed to one side of the fixing plate, and the other side of the fixing plate is connected to the puncture needle. It also includes a liquid storage bottle with a sealing plug at the bottle opening. The puncture needle penetrates the sealing plug and extends into the interior of the liquid storage bottle.

[0015] In the preferred embodiment, the opening and closing directions of the No. 1 medical check valve and the No. 2 medical check valve are opposite. The No. 1 medical check valve conducts unidirectionally from the liquid chamber to the outside, while the No. 2 medical check valve conducts unidirectionally from the outside to the liquid chamber.

[0016] This invention provides a negative pressure conjunctival sac irrigation device, which, through the cooperation of the above-mentioned structures, has the following beneficial effects: First, by using the medical check valve, the irrigation fluid can be directly drawn and used immediately by utilizing the negative pressure suction principle, eliminating the need for repeated fluid aspiration and improving operational efficiency. At the same time, combined with the single-use mechanism of disposable syringes, the risk of cross-infection caused by multiple people sharing the same syringe is completely eliminated. Secondly, the head of the disposable syringe is designed with an inverted diaphragm valve, which can effectively prevent liquid backflow from contaminating the rinsing solution and prevent dripping and waste, thus providing dual protection for the sterility of the rinsing system and the efficiency of liquid utilization. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a three-dimensional exploded view of the present invention; Figure 2 This is a utility model Figure 1 A three-dimensional diagram of a bottle stopper puncture device; Figure 3 This is a utility model Figure 1 A three-dimensional schematic diagram of the central locking element, the secondary-disposable needle tube, and the inverted diaphragm valve; Figure 4 This is a utility model Figure 3 Cross-sectional schematic diagram of a medium-throw syringe and an inverted diaphragm valve; Figure 5 This is a utility model Figure 3 A three-dimensional schematic diagram of an inverted diaphragm valve; Figure 6 This is a diagram showing the usage state of this utility model.

[0018] In the diagram: 1. Empty cylinder; 2. Ring-shaped grip; 3. Piston body; 4. Nipple; 5. No. 1 medical check valve; 6. Locking element; 61. Locking base; 62. No. 1 pagoda connector; 7. Disposable needle; 8. Inverted membrane valve; 9. L-shaped connecting tube; 10. No. 2 medical check valve; 11. Tube; 12. Bottle stopper puncture device; 121. No. 2 pagoda connector; 122. Fixing plate; 123. Puncture needle; 13. Storage bottle. Detailed Implementation

[0019] To better understand the purpose, structure, and function of this utility model, the embodiments and features described herein can be combined with each other without conflict. The utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Example 1 like Figures 1-6 As shown in the figure, this embodiment illustrates a negative pressure conjunctival sac irrigation device, including a hollow cylinder 1, annular gripping parts 2, and a piston body 3. The hollow cylinder 1 has a hollow cylindrical structure and an axially extending liquid-containing cavity formed inside. One end of the hollow cylinder 1 has an opening communicating with the liquid-containing cavity, and the other end is a closed end. Two annular gripping parts 2 are symmetrically arranged circumferentially on the outer wall near the opening of the hollow cylinder 1 for easy gripping and operation by the user. The piston body 3 is slidably and sealed inside the liquid-containing cavity of the hollow cylinder 1 and moves back and forth along the axial direction of the hollow cylinder 1. The device also includes a nipple 4 at the axial center of the closed end of the hollow cylinder 1, communicating with the liquid-containing cavity. The nipple 4 has a negative pressure output part communicating with the liquid-containing cavity and allowing fluid to flow unidirectionally from the liquid-containing cavity to the outside. The closed end of the hollow cylinder 1 has a negative pressure input part arranged radially opposite to the nipple 4 and allowing fluid to flow unidirectionally from the outside to the liquid-containing cavity. The irrigation fluid is introduced into the liquid-containing cavity of the hollow cylinder 1 by the negative pressure generated by the reciprocating movement of the piston body 3.

[0021] Among them, such as Figure 1 As shown, the nipple 4 is integrally formed with the hollow cylinder 1 using injection molding. The negative pressure output section is used to restrict the backflow of fluid from the liquid chamber to the negative pressure input section, and the negative pressure input section is used to restrict the backflow of fluid from the external environment to the liquid chamber. It should be noted that the piston body 3 includes a handle, a core rod, and a piston. One end of the core rod extends to the outside of the empty cylinder 1 and is connected to the handle, while the other end is inserted into the empty cylinder 1 and connected to the piston. The piston is slidably sealed to the inner wall of the empty cylinder 1.

[0022] In this embodiment, as Figure 1As shown, the negative pressure output unit includes a No. 1 medical check valve 5 inserted into the nipple 4 at one end. The outer wall of the other end of the No. 1 medical check valve 5 is provided with a screw-in protrusion and connected to a locking member 6. A disposable needle tube 7 is detachably connected to the locking member 6. After use, the entire disposable needle tube 7 can be disassembled and replaced with a new disposable needle tube to avoid cross-infection. The disposable needle tube 7 is a hollow tube structure with both ends through. An inverted membrane valve 8 is embedded in the inner wall of the end of the disposable needle tube 7 away from the locking member 6. Under normal conditions, the membrane closes and forms a closed fluid barrier surface to prevent liquid leakage. Furthermore, such as Figure 3 As shown, the locking component 6 consists of a locking base 61 and a first pagoda connector 62. The outer wall of the locking base 61 is provided with anti-slip texture extending in the circumferential direction. The locking base 61 is a cylindrical cavity structure with one end closed and the other end open. The inner wall of the locking base 61 is provided with an internal thread that engages with the screw-in protrusion at one end of the first medical check valve 5. The first pagoda connector 62 is a tapered pagoda-shaped structure. One end face of the first pagoda connector 62 is coaxially connected to the closed end of the locking base 61, and the other end is inserted into the inner wall of the secondary-disposable needle tube 7 near the end of the locking component 6, forming a mechanical engagement to prevent it from falling off. It should be noted that the inner side of the locking base 61 is provided with a multi-layer annular sealing structure, including a side sealing ring that is tightly fitted onto the surface of the internal thread root diameter and has an interference fit with the outer wall of one end of the first medical check valve 5. When the locking base 61 is tightened, it is squeezed and undergoes radial deformation to fill the thread gap and prevent liquid from seeping out from the gap between the first medical check valve 5 and the locking base 61. It also includes a top sealing ring embedded on the side of the locking base 61 near the first pagoda connector 62. The top sealing ring has an O-shaped structure and makes face-to-face contact with the end face of the first medical check valve 5 for further sealing.

[0023] It should also be noted that the annular sealing structure is a nitrile rubber ring; Furthermore, such as Figure 5 As shown, the inverted diaphragm valve 8 consists of an annular base and an elastic diaphragm. The outer peripheral wall of the annular base is fixedly connected to the inner wall of the secondary-disposable needle tube 7. The elastic diaphragm is integrally formed with the annular base. The elastic diaphragm is recessed along the axial direction of the secondary-disposable needle tube 7 towards the locking member 6 to form an umbrella-shaped inverted conical structure. The edge of the elastic diaphragm converges towards the central axis of the secondary-disposable needle tube 7 to form a normally closed sealing surface. In feasible implementations, the cone angle of the elastic membrane ranges from 60° to 90°.

[0024] The fixed connection between the annular base and the secondary-displacement needle tube 7 is at least one of the following: hot melt welding, medical adhesive bonding, or integral injection molding.

[0025] Preferred solutions such as Figure 4As shown, a cross-shaped pre-cut that does not penetrate the elastic membrane is provided in the central region of the elastic membrane, forming four elastic lobes distributed at equal angles along the circumference. The geometry of each elastic lobe is completely identical, and the thickness of the four elastic lobes gradually decreases from the root to the end, so that the membrane opens symmetrically when it is opened, the fluid is evenly distributed, and the flow is avoided.

[0026] Among them, such as Figure 5 As shown, the depth of the cross-shaped pre-cut is 0.03 to 0.05 mm, the thickness of the root of the elastic flap is between 1 / 3 and 1 / 2 of the thickness of the end, and the four elastic flaps are evenly distributed at 90° intervals along the circumference. The thickness difference forms a stress concentration area, which reduces the opening pressure.

[0027] In one feasible embodiment, the root thickness of the elastic flap is A, the end thickness of the elastic flap is B, the root thickness A ranges from 0.3 mm to 0.5 mm, the end thickness B ranges from 0.1 mm to 0.15 mm, and A > B.

[0028] It should be noted that the inverted diaphragm valve 8 is made of either medical-grade silicone or thermoplastic elastomer. In specific implementation, under the closed state without pressure input, since the cross-shaped pre-cut does not penetrate the elastic membrane, the four elastic petals are in a closed and folded state, forming a quadruple sealing line. When inverted, the combined force of the liquid's gravity and atmospheric pressure is less than the closing elastic force of the elastic membrane. Therefore, it is impossible to push the elastic petals open, achieving zero leakage. When the piston in the piston body 3 moves towards the closed end of the empty cylinder 1, the flushing fluid in the liquid chamber generates pressure under the push of the piston body 3. When the pressure exceeds the threshold, the elastic petals are impacted by the fluid pressure and open outward, generating a radial expansion force and concentrating the stress in the cross-shaped pre-cut area. The elastic petals flip outward along the cross-shaped pre-cut, forming four symmetrical fan-shaped channels. The liquid flows out evenly along the gaps between the elastic petals. When the discharge stops, the pressure disappears, and under its own elastic force, the elastic petals automatically converge and close towards the central axis of the secondary-throw needle tube 7, forming a closed state and blocking the liquid from dripping.

[0029] In this embodiment, as Figure 1 , 6 As shown, the negative pressure input section includes an L-shaped connecting tube 9 disposed at the closed end of the empty cylinder 1 and radially opposite to the nipple 4. One end of the L-shaped connecting tube 9 is sealed and connected to the liquid chamber of the empty cylinder 1, and the other end is tightly connected to a second medical check valve 10 in a sealed and detachable manner. The end of the second medical check valve 10 away from the L-shaped connecting tube 9 is connected to a flexible tube 11 in an interference fit manner. The other end of the flexible tube 11 is tightly connected to a bottle stopper puncturist 12 in a sealed and detachable manner. Specifically, when fluid flows from hose 11 to the liquid chamber of empty cylinder 1, the second medical check valve 10 opens under pressure. When the pressure in the liquid chamber of empty cylinder 1 increases and there is a tendency for backflow, the second medical check valve 10 closes under pressure to prevent fluid backflow. The hose 11 achieves a tight and sealed connection through interference fit or sealing ring, ensuring that the flushing fluid can flow smoothly without leakage.

[0030] Furthermore, such as Figure 2 As shown, the bottle stopper puncture device 12 includes a second pagoda connector 121, a fixing plate 122, and a puncture needle 123, which are coaxially fixed from left to right. The second pagoda connector 121 has a tapered pagoda-shaped structure. The tapered end of the second pagoda connector 121 is inserted into the inner wall of one end of the tubing 11 and forms a mechanical engagement. The expanding end of the second pagoda connector 121 is fixed to one side of the fixing plate 122, and the other side of the fixing plate 122 is connected to the puncture needle 123. It also includes a storage bottle 13, with a sealing plug at the mouth of the storage bottle 13. A puncture needle 123 penetrates the sealing plug and extends into the interior of the storage bottle 13 to extract the flushing fluid from the storage bottle 13. During implementation, as the piston 3 moves outward within the empty cylinder 1, the volume of the liquid-containing cavity of the empty cylinder 1 increases, and the internal pressure decreases, creating a negative pressure environment. Since the pressure inside the storage bottle 13 is higher than the pressure in the liquid-containing cavity of the empty cylinder 1, the flushing fluid is forced into the bottle stopper puncture device 12 under the action of the pressure difference. At this time, the second medical check valve 10 opens under the action of the pressure difference, allowing the flushing fluid to pass through. The flushing fluid passes sequentially through the hose 11, the second medical check valve 10, and the L-shaped connecting tube 9, and finally flows into the liquid-containing cavity of the empty cylinder 1. When the piston 3 moves towards the closed end within the empty cylinder 1, the volume of the liquid-containing cavity decreases, and the pressure increases. The second medical check valve 10 closes under the pressure to prevent the flushing fluid from flowing back into the storage bottle 13. At the same time, the first medical check valve 5 opens, and the flushing fluid in the liquid-containing cavity is discharged sequentially through the nipple 4, the first medical check valve 5, and the disposable needle tube 7. The inverted diaphragm valve 8 opens under the pressure, and the flushing fluid flows out, thus realizing the flushing function.

[0031] In this embodiment, as Figure 6 As shown, the opening and closing directions of the first medical check valve 5 and the second medical check valve 10 are opposite. The first medical check valve 5 is unidirectionally guided from the liquid chamber to the outside, while the second medical check valve 10 is unidirectionally guided from the outside to the liquid chamber. The switching between the flushing fluid extraction and discharge states is achieved through the reciprocating motion of the piston body 3.

[0032] In specific implementation, when the piston in the piston body 3 moves toward the closed end of the empty cylinder 1, the pressure inside the liquid chamber increases, the second medical check valve 10 closes, and the first medical check valve 5 opens, so that the fluid is discharged from the liquid chamber under positive pressure. When the piston in piston body 3 moves toward the opening of empty cylinder 1, the second medical check valve 10 opens due to the negative pressure of the liquid chamber, and the first medical check valve 5 closes due to fluid pressure, so that the flushing fluid in the storage bottle 13 is input into the liquid chamber through negative pressure.

[0033] To enable those skilled in the art to better understand the present invention, the above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

[0034] It should also be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this utility model described herein.

Claims

1. A negative pressure conjunctival sac irrigation device, comprising a hollow cylinder (1), annular gripping parts (2), and a piston body (3), wherein the hollow cylinder (1) has a hollow cylindrical structure and an axially extending liquid-containing cavity is formed inside, one end of the hollow cylinder (1) is provided with an opening communicating with the liquid-containing cavity, and the other end is a closed end, two annular gripping parts (2) are symmetrically arranged circumferentially on the outer wall near the opening of the hollow cylinder (1), and a piston body (3) is provided in the liquid-containing cavity of the hollow cylinder (1) and reciprocates along the axial direction of the hollow cylinder (1), characterized in that, It also includes a nipple (4) that is connected to the liquid chamber at the axial position of the closed end of the empty cylinder (1), a negative pressure output part that is connected to the liquid chamber on the nipple (4), and a negative pressure input part that is radially opposite to the nipple (4) at the closed end of the empty cylinder (1).

2. The negative pressure conjunctival sac irrigation device according to claim 1, characterized in that, The negative pressure output unit includes a No. 1 medical check valve (5) inserted into the nipple (4) at one end. The other end of the No. 1 medical check valve (5) has a screw-in protrusion on its outer wall and is connected to a locking member (6). A disposable needle tube (7) is detachably connected to the locking member (6). The disposable needle tube (7) is a hollow tube structure with both ends through. An inverted diaphragm valve (8) is embedded in the inner wall of the end of the disposable needle tube (7) away from the locking member (6).

3. The negative pressure conjunctival sac irrigation device according to claim 2, characterized in that, The locking component (6) consists of a locking base (61) and a No. 1 pagoda connector (62). The outer wall of the locking base (61) is provided with anti-slip texture extending in the circumferential direction. The locking base (61) is a cylindrical cavity structure with one end closed and the other end open. The inner wall of the locking base (61) is provided with an internal thread that meshes with the screw-in protrusion at one end of the No. 1 medical check valve (5). The No. 1 pagoda connector (62) is a tapered pagoda-shaped structure. One end face of the No. 1 pagoda connector (62) is coaxially connected to the closed end of the locking base (61), and the other end is inserted into the inner wall of the secondary-disposable needle tube (7) near the locking part (6) to form a mechanical engagement.

4. The negative pressure conjunctival sac irrigation device according to claim 3, characterized in that, The inner side of the locking base (61) is provided with a multi-layer annular sealing structure, including a side sealing ring that is sleeved on the surface of the internal thread root diameter and has an interference fit with the screw-in protrusion on the outer wall of one end of the No. 1 medical check valve (5). It also includes a top sealing ring embedded in the locking base (61) on the side near the No. 1 pagoda connector (62). The top sealing ring has an O-shaped structure and is in contact with the end face of the No. 1 medical check valve (5) for sealing.

5. The negative pressure conjunctival sac irrigation device according to any one of claims 2 to 4, characterized in that, The inverted diaphragm valve (8) consists of an annular base and an elastic diaphragm. The outer peripheral wall of the annular base is fixedly connected to the inner wall of the secondary-disposable needle tube (7). The elastic diaphragm is integrally formed with the annular base. The elastic diaphragm is recessed along the axial direction of the secondary-disposable needle tube (7) towards the locking member (6) to form an umbrella-shaped inverted conical structure. The edge of the elastic diaphragm converges towards the central axis of the secondary-disposable needle tube (7) to form a normally closed sealing surface.

6. The negative pressure conjunctival sac irrigation device according to claim 5, characterized in that, A cross-shaped pre-cut that does not penetrate the elastic membrane is provided in the central region of the elastic membrane, forming four elastic lobes distributed at equal angles along the circumference. The thickness of the four elastic lobes gradually decreases from the root to the end.

7. The negative pressure conjunctival sac irrigation device according to claim 6, characterized in that, The depth of the cross-shaped pre-cut is 0.03 to 0.05 mm, the thickness of the root of the elastic flap is 1 / 3 to 1 / 2 of the thickness of the end, and the four elastic flaps are evenly distributed at 90° intervals along the circumference.

8. The negative pressure conjunctival sac irrigation device according to claim 2, characterized in that, The negative pressure input unit includes an L-shaped connecting tube (9) located at the closed end of the empty cylinder (1) and radially opposite to the nipple (4). One end of the L-shaped connecting tube (9) is connected to the liquid chamber of the empty cylinder (1), and the other end is connected to a No. 2 medical check valve (10). The end of the No. 2 medical check valve (10) away from the L-shaped connecting tube (9) is connected to a flexible tube (11), and the other end of the flexible tube (11) is connected to a bottle stopper puncturist (12).

9. The negative pressure conjunctival sac irrigation device according to claim 8, characterized in that, The bottle stopper puncture device (12) includes a second pagoda connector (121), a fixing plate (122), and a puncture needle (123) that are coaxially fixed from left to right. The second pagoda connector (121) is a tapered pagoda-shaped structure. The tapered end of the second pagoda connector (121) is inserted into the inner wall of one end of the tubing (11) to form a mechanical engagement. The expanding end of the second pagoda connector (121) is fixed to one side of the fixing plate (122), and the other side of the fixing plate (122) is connected to the puncture needle (123). It also includes a storage bottle (13), the mouth of which is provided with a sealing plug, and a puncture needle (123) penetrates the sealing plug and extends into the interior of the storage bottle (13).

10. The negative pressure conjunctival sac irrigation device according to claim 9, characterized in that, The opening and closing directions of the No. 1 medical check valve (5) and the No. 2 medical check valve (10) are opposite. The No. 1 medical check valve (5) is unidirectionally guided from the liquid chamber to the outside, while the No. 2 medical check valve (10) is unidirectionally guided from the outside to the liquid chamber.

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