Cataract surgical instrument

Abstract

A cataract surgical instrument belongs to the technical field of medical surgical instruments. The cataract surgical instrument comprises a guide tube (3), a deformation part (2) and a mesh bag (1), a notch (31) communicated with an inner cavity (35) of the guide pipe (3) is formed in the end part of the guide pipe (3); the deformation piece (2) comprises a deformation part (21) and a connecting part (22) connected with the deformation part (21), and the connecting part (22) is arranged in the inner cavity (35) in a penetrating mode and can move in the axial direction of the guide pipe (3); the mesh bag (1) is connected with the deformation part (21); and the connecting part (22) drives the deformation part (21) and the mesh bag (1) to move along the axial direction of the guide pipe (3), so that the deformation part (21) and the mesh bag (1) are contracted in the inner cavity (35) or expanded outside the inner cavity (35). Cataract surgical instruments adopt a crystalline lens mechanical centripetal cutting mode, so that thermal injury to intraocular tissues is avoided; the posterior capsule, the suspension ligament and the corneal endothelium are not easily damaged; operation time is short, efficiency is high, operation incision is small, patient pain is small, and recovery is fast; the operation is simple and easy to learn, the cost is low, and various defects of ultrasonic vibration are avoided.

Description

Cataract surgery instrument Technical Field

[0001] The invention relates to a cataract surgical instrument and belongs to the technical field of medical surgical instruments. Background Art

[0002] Cataracts are a common blinding eye disease caused by the clouding of the lens due to various factors, such as aging, physical and chemical damage, and inflammation. This clouding causes the lens to become opaque, obstructing light and thus affecting vision. Common surgical procedures for treating cataracts include traditional extracapsular cataract extraction, extracapsular cataract extraction with small-incision manual nucleus fragmentation, phacoemulsification with intraocular lens implantation, and femtosecond laser cataract surgery.

[0003] Traditional extracapsular cataract extraction offers several advantages over intracapsular cataract extraction: it can be performed under a surgical microscope, using microsurgical instruments, and significantly improved surgical techniques, creating conditions for intraocular lens implantation. However, it also has several disadvantages: a relatively large incision, prolonged surgery, and slow postoperative recovery. Due to the large incision and significant astigmatism, postoperative vision recovery is poor, requiring hospitalization.

[0004] Small-incision extracapsular cataract extraction with manual nucleus fragmentation is a procedure with an incision between traditional large-incision cataract surgery and minimally invasive phacoemulsification. Compared to minimally invasive phacoemulsification, it requires a larger incision, induces more astigmatism, and has a slower recovery and longer operative time. The incision is typically up to 5.5 mm, and the operative time is approximately 15 to 30 minutes. Complications are also more common, including corneal endothelial damage (causing corneal edema); iris damage (causing hyphema and root severance); posterior capsule rupture (preventing intraocular lens implantation); and postoperative complications such as fulminant choroidal hemorrhage, the most serious of which is intraocular infection. This procedure is suitable for economically underdeveloped areas or those without phacoemulsification equipment.

[0005] The advantages of phacoemulsification plus intraocular lens implantation are: small surgical incision, traditional surgical incision is 12mm, this surgical incision is less than 3mm; the surgical reaction is mild, the incision heals quickly, and vision recovers faster and better; the postoperative astigmatism is small and easier to correct or control, safe and stable; the operation time is short, even within a quarter of an hour; no hospitalization is required, and the patient can go home after the operation, without having to wait for the cataract to mature before the operation, and the patient is even painless, with few surgical and postoperative complications. However, it also has unavoidable defects, which are mainly determined by the physical properties of ultrasound. The specific defects are as follows:

[0006] 1. Unknowability of the ultrasonic range: During phacoemulsification of cataracts, the range of ultrasonic action is impossible for the surgeon to perceive. Moreover, its action range is not limited to the vicinity of the opening of the phacoemulsification needle, but also occurs along the energy transmission path. During the operation, the cataract pulverization and emulsification observed by people are only the results. The actual microscopic process, the ultrasonic wave itself, and its action range and form are not observable during the operation, which is a high risk.

[0007] 2. Ultrasonic waves are non-selective: they not only affect cataracts, but also cause physical and chemical changes in other tissues in the eye due to the energy they transmit and the resulting impact and cavitation, which can easily damage the eyeball.

[0008] 3. Invisibility of ultrasound: The vast majority of physical and chemical changes in other tissues within the eye occur at the molecular level, which is a microscopic process that is impossible for humans to detect. What humans can see are only the results. In fact, the results of these changes are often delayed, and the extent of these changes is related to the energy of the ultrasound released during the operation.

[0009] 4. Ultrasonic cavitation effect: The repulsive force generated by ultrasound and the bubbles generated by cavitation will affect the fluid dynamics during cataract aspiration;

[0010] 5. Ultrasound's mechanical effects (the mechanical effects of ultrasound propagation through a medium are caused by reflection): This can induce several responses in the body. Ultrasound's subtle massage of tissue cellular substances causes cytoplasm flow, cell rotation, and friction, resulting in a cellular massage effect, also known as "internal massage." This unique characteristic of ultrasound therapy can alter cell membrane permeability, stimulate diffusion across semipermeable membranes, promote metabolism, accelerate blood and lymphatic circulation, alleviate cellular ischemia and hypoxia, improve tissue nutrition, alter protein synthesis rates, and enhance regenerative function. This can alter the internal structure of cells, leading to functional changes and causing hard connective tissue to stretch and soften.

[0011] 6. The thermal effect of ultrasound is reflected at the boundary between different tissues to form standing waves, which causes the mutual movement between molecules, generating friction and heat, which can easily damage the eyeball.

[0012] Femtosecond laser cataract surgery uses computer-generated precision to perform the most challenging steps of traditional surgery. Focused femtosecond laser pulses are used to create incisions in the lens capsule, lens, and cornea. This allows the surgery to be tailored to the surgeon's specific needs, bringing a new level of precision to the procedure. Compared to traditional phacoemulsification, femtosecond laser cataract surgery can reduce phacoemulsification energy by 43% and phacoemulsification time by 51%. No force is applied to the incisions, eliminating the potential for eye damage from both the operator and the instrument. The entire procedure is fully digitally controlled by a computer and performed with femtosecond lasers, ensuring accuracy and reducing the standard deviation of the surgeon's operation. The microscopic level is precise and predictable, and the incisions are accurate, reliable, predictable, and reproducible. However, the major drawback of this procedure is its high cost and limited universal application.

[0013] Due to the various shortcomings of the above surgeries, it is necessary to design a cataract surgical instrument that not only has the advantages of various surgeries, such as small surgical incision (less than 3mm), short operation time, economy and practicality, and universality; but also avoids various injuries, such as the various disadvantages of ultrasonic vibration.

[0014] Summary of the Invention

[0015] To solve the above problems, the present invention provides a cataract surgical instrument. During use, the surgical incision of the surgical instrument is small, less than 3mm, and the number of existing incisions is not increased; no ultrasound or laser is required, avoiding the various disadvantages of ultrasonic vibration; it is not easy to damage the posterior capsule, suspensory ligament and corneal endothelium, the operation time is short, the efficiency is high, the patient suffers less pain, and the recovery is fast; the operation is simple, convenient and practical; the cost is low, does not increase the cost burden of the patient, is economical and practical, and has universal applicability.

[0016] The object of the present invention is to provide a cataract surgical instrument, comprising:

[0017] A guide tube, wherein an end portion of the guide tube is provided with an incision communicating with the inner cavity thereof;

[0018] a deformable member, the deformable member comprising a deformable portion and a connecting portion connected to the deformable portion, the connecting portion being disposed in the inner cavity and capable of moving along the axial direction of the guide tube; and

[0019] a mesh bag connected to the deformation portion;

[0020] The connecting portion drives the deformation portion and the mesh bag to move along the axial direction of the guide tube, so that the deformation portion and the mesh bag are contracted in the inner cavity or opened outside the inner cavity.

[0021] In one embodiment of the present invention, a push rod is further included, wherein the push rod is connected to the connecting portion and is used to drive the connecting portion to move along the axial direction of the guide tube.

[0022] In one embodiment of the present invention, an outer tube is further included, the guide tube is connected to the outer tube, and the push rod is passed through the outer tube and the guide tube and connected to the connecting portion.

[0023] In one embodiment of the present invention, the guide tube includes a first tube segment and a second tube segment connected to the first tube segment, the incision is located at one end of the first tube segment away from the second tube segment, the outer wall of the second tube segment is provided with at least one protrusion, the end of the outer tube is provided with an open groove matching the protrusion, and the guide tube is assembled in the open groove.

[0024] In one embodiment of the present invention, the interior of the outer tube is sequentially provided with a first cavity, a second cavity and a third cavity, the cross-section of the second cavity is smaller than the cross-sections of the first cavity and the third cavity, and the guide tube is assembled in the first cavity.

[0025] In one embodiment of the present invention, the push rod includes a first rod body and a second rod body, the cross-section of the first rod body is smaller than the cross-section of the second rod body, the second rod body is inserted into the third cavity, and the first rod body is inserted into the first cavity and the second cavity and is fixedly connected to the connecting part.

[0026] In one embodiment of the present invention, a push handle is provided at one end of the second rod body facing away from the first rod body. The push handle is located outside the outer tube and a plug is provided between the push handle and the outer tube.

[0027] In one embodiment of the present invention, the size of the deformation portion is larger than the size of the inner cavity.

[0028] In one embodiment of the present invention, the deformation portion is an annular structure formed by winding a long strip, the annular structure is an open-loop structure or a closed-loop structure, the material of the long strip is a shape memory material, the height of the long strip is 0.01-2 mm, and the thickness is 0.01-2 mm.

[0029] In one embodiment of the present invention, the mesh bag is a bag-like structure with an opening, which is woven from a plurality of ultrafine wires and formed with a plurality of mesh holes, and the opening of the mesh bag is connected to the long strip. Beneficial effects

[0030] (1) The present invention adopts a centripetal cutting method for the lens. Since the lens nucleus is cut centripetally mechanically, almost no heat is generated and there is no thermal damage to the intraocular tissue. Centripetal cutting of the lens nucleus is not easy to damage the posterior capsule, suspensory ligament and corneal endothelium. It is simple and easy to learn, with a short operation time and high efficiency, less pain for the patient and quick recovery. It is simple to operate, convenient and practical. It is low in cost and does not increase the cost burden on the patient. The surgical incision is small and does not increase the number of existing incisions. It does not require the use of ultrasound or laser, thus avoiding the various disadvantages of ultrasonic vibration.

[0031] (2) The present invention can conveniently enter and exit the inside of the eyeball through a smaller surgical incision through the telescopic deformation part and the mesh bag. When the deformation part enters the inside of the eyeball, the deformation part drives the mesh bag to open and wrap the turbid lens nucleus. Pulling the connecting part causes the deformation part to drive the mesh bag to shrink again, automatically tightening and cutting the lens nucleus, so that the lens nucleus is completely broken. This method of mechanical centripetal cutting of the lens only requires a very small surgical incision to complete the operation, without increasing the number of existing incisions, greatly reducing damage to the patient's eyeball, shortening the patient's postoperative recovery speed, and reducing surgical and postoperative complications. It is economical, practical, and has universal applicability.

[0032] (3) The deformation portion of the present invention is a ring-shaped structure formed by winding a long strip, and the ring-shaped structure is an open-loop structure or a closed-loop structure. The material of the long strip is a shape memory material with superelasticity. The material has memory properties when deformed and can immediately restore the memory properties after deformation, so that it can smoothly pass through a smaller surgical incision and freely enter and exit the eyeball.

[0033] (4) The mesh bag of the present invention is a bag-like structure with an opening, which is woven from a plurality of ultrafine wires and formed with a plurality of mesh holes, and the opening of the mesh bag is connected to the long strip; the particle size of the crystal nucleus crushed can be controlled by controlling the number of ultrafine wires and the size of the mesh hole spacing, and the strength of the ultrafine wires can cut lens nuclei of any hardness. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 is a perspective view of a cataract surgical instrument according to the present invention;

[0035] FIG2 is an exploded view of the cataract surgical instrument of the present invention;

[0036] FIG3 is a front view of the cataract surgical instrument of the present invention;

[0037] FIG4 is a cross-sectional view of the cataract surgical instrument of the present invention;

[0038] FIG5 is an assembly diagram of the guide tube and the outer tube of the present invention;

[0039] FIG6 is a cross-sectional view of the outer tube of the present invention;

[0040] FIG7 is a front view of the push rod of the present invention;

[0041] FIG8 is a top view of the deformable member of the present invention;

[0042] FIG9 is a perspective view of a guide tube of the present invention;

[0043] FIG10 is a cross-sectional view of the guide tube of the present invention.

[0044] Among them: 1. mesh bag; 2. deformation part; 21. deformation part; 22. connection part; 3. guide tube; 31. incision; 32. first tube section; 33. second tube section; 34. protrusion; 35. inner cavity; 4. outer tube; 41. first cavity; 42. second cavity; 43. third cavity; 44. opening groove; 5. plug; 6. push rod; 61. first rod body; 62. second rod body; 63. push handle. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] In the present invention, unless otherwise expressly specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0047] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0048] Example 1

[0049] As shown in Figures 1-10, this embodiment provides a cataract surgical instrument, including a mesh bag 1, a deformable part 2 and a guide tube 3, wherein the end of the guide tube 3 is provided with an incision 31 connected to its inner cavity 35; the deformable part 2 includes a deformable part 21 and a connecting part 22 connected to the deformable part 21, the connecting part 22 is passed through the inner cavity 35 and can move along the axial direction of the guide tube 3; the mesh bag 1 is connected to the deformable part 21; wherein the connecting part 22 drives the deformable part 21 and the mesh bag 1 to move along the axial direction of the guide tube 3, so that the deformable part 21 and the mesh bag 1 shrink in the inner cavity 35 or open outside the inner cavity 35. The telescopic deformable portion 21 and mesh bag 1 can be conveniently inserted into and out of the eyeball through a relatively small surgical incision. When the deformable portion 21 enters the eyeball, it drives the mesh bag 1 to expand and enclose the turbid lens nucleus. Pulling the connecting portion 22 causes the deformable portion 21 to retract the mesh bag 1 again, automatically tightening and cutting the lens nucleus, completely shattering it. The present invention utilizes this mechanical centripetal cutting method for the lens, which generates virtually no heat and causes no thermal damage to intraocular tissue. The procedure can be completed through only a very small surgical incision, eliminating the need to increase the number of existing incisions, significantly reducing damage to the patient's eyeball and shortening postoperative recovery. The procedure is less likely to damage the posterior capsule, suspensory ligament, and corneal endothelium, resulting in fewer surgical and postoperative complications. The procedure is simple to learn, shortens the surgical time, is highly efficient, minimizes patient pain, and allows for a faster recovery. The procedure is simple, convenient, and practical to operate. It is economical, practical, and universally applicable, without increasing the patient's financial burden. It does not require the use of ultrasound or lasers, thus avoiding the various disadvantages of ultrasonic vibration.

[0050] Optionally, a push rod 6 is further included, wherein the push rod 6 is connected to the connecting portion 22 and is used to drive the connecting portion 22 to move along the axial direction of the guide tube 3.

[0051] Optionally, an outer tube 4 is further included, the guide tube 3 is connected to the outer tube 4 , and the push rod 6 is passed through the outer tube 4 and the guide tube 3 and connected to the connecting portion 22 .

[0052] Optionally, the guide tube 3 includes a first tube segment 32 and a second tube segment 33 connected to the first tube segment 32, the incision 31 is located at one end of the first tube segment 32 away from the second tube segment 33, the outer wall of the second tube segment 33 is provided with at least one protrusion 34, and the end of the outer tube 4 is provided with an open groove 44 that cooperates with the protrusion 34, and the guide tube 3 is assembled in the open groove 44.

[0053] Optionally, the interior of the outer tube 4 is sequentially provided with a first cavity 41, a second cavity 42 and a third cavity 43, the cross-section of the second cavity 42 is smaller than the cross-sections of the first cavity 41 and the third cavity 43, and the guide tube 3 is assembled in the first cavity 41.

[0054] Optionally, the push rod 6 includes a first rod 61 and a second rod 62. The cross-section of the first rod 61 is smaller than that of the second rod 62. The second rod 62 is disposed in the third cavity 43. The first rod 61 is disposed in the first cavity 41 and the second cavity 42 and is fixedly connected to the connecting portion 22. Furthermore, the cross-section of the second cavity 42 is larger than that of the first rod 61, so that the first rod 61 can pass through the second cavity 42 and move along the axis of the guide tube 3 within the second cavity 42.

[0055] It can be seen from this that the guide tube 3 is located in the first cavity 41, and the second rod body 62 is located in the third cavity 43. The second cavity 42 with a smaller cross-section can play a limiting role, so that the second rod body 62 of the push rod 6 can only move in the third cavity 43. At the same time, it also makes the deformation part 21 and the mesh bag 1 connected to the deformation part 21 can only move in the inner cavity 35 of the guide tube 3, limiting the axial displacement of the deformation part 21 and the mesh bag 1, and preventing the deformation part 21 and the mesh bag 1 from being pulled out of the outer tube 4 by the push rod 6.

[0056] Optionally, a handle portion 63 is provided at one end of the second rod body 62 facing away from the first rod body 61, which facilitates pushing and pulling of the push rod 6, making it easy to use. The handle portion 63 is located outside the outer tube 4, and a plug 5 is provided between the handle portion 63 and the outer tube 4. Optionally, a protrusion is provided at one end of the second rod body 62 near the first rod body 61, the cross-section of the protrusion being larger than the cross-section of the inner cavity of the plug 5. The plug 5 acts as a limit, so that the second rod body 62 of the push rod 6 can only move within the third cavity 43. The extreme position of the push rod 6 is when the protrusion on the second rod body 62 abuts the plug 5, which can effectively prevent the push rod 6 from escaping from the outside of the outer tube 4.

[0057] Optionally, the size of the deformable portion 21 is larger than the size of the inner cavity 35. The deformable portion 21 is deformed within the inner cavity 35 and returns to its original shape outside the inner cavity 35. The deformable portion 21 may initially be elliptical, circular, flat, or other shapes, without limitation. Those skilled in the art may modify the shape of the deformable portion 21 based on the desired use of the deformable portion 21. The deformed shape of the deformable portion 21 is an elongated strip, which is determined by the shape of the inner cavity 35.

[0058] Optionally, the deformable portion 21 is an annular structure formed by winding a long strip, the annular structure being an open-loop structure or a closed-loop structure. The strip is made of a shape-memory material, and the strip has a height of 0.01-2 mm and a thickness of 0.01-2 mm. Specifically, the annular wall depth of the deformable portion 21, i.e., the strip's height, is 0.01-2 mm, and the annular wall thickness, i.e., the strip's thickness, is 0.01-2 mm. These annular wall depth and thickness are configured to minimize damage to the surgical incision and allow for relatively free entry and exit. The deformable portion 21 is superelastic, and its material exhibits memory upon deformation, immediately recovering the memory properties after deformation, enabling smooth entry and exit of the eye through a 3 mm surgical incision.

[0059] Optionally, the mesh bag 1 is a bag-like structure with an opening, woven from a plurality of ultrafine wires and having a plurality of mesh openings. Optionally, the mesh openings have a diameter of 0.01-4 mm, preferably 0.03 mm. The opening of the mesh bag 1 is connected to the strip. The particle size of the pulverized crystal nucleus can be controlled by controlling the number of ultrafine wires and the mesh spacing. The strength of the ultrafine wires is sufficient to cut lens nuclei of any hardness.

[0060] Preferably, the characteristic of the lens nucleus is that the harder the nucleus is, the lens is in the shape of a biconvex lens, with an anterior-posterior diameter of 4 to 5 mm, a diameter of 9 mm, a front curvature radius of 10 mm, a back curvature radius of 6 mm, a slightly flatter front than the back, and the front is about 3.6 mm away from the anterior vertex of the cornea. The lens is composed of multiple layers of materials with different refractive indices, and the closer to the center, the denser it becomes optically. There is a refractive index gradient from the anterior pole to the posterior pole, and from the center to the equator. So far, the hardness of the lens is insufficient, and there is a gradient from the periphery to the center, and the nucleus becomes harder towards the center. And because the periphery of the lens nucleus has a portion of its length removed from the cortex, and the periphery and anterior and posterior surfaces of the lens nucleus are relatively soft, a portion of its size is further reduced. Therefore, it is necessary to enclose the lens nucleus. The deformation portion 21 of this embodiment is preferably elliptical, and its longitudinal length is preferably 6.6 mm, and its transverse length is preferably 3.6 mm.

[0061] Working principle of the present invention:

[0062] 1. First, pull the push rod to shrink the deformable part and the mesh bag into the inner cavity of the guide tube. Holding the surgical instrument, insert the front end of the guide tube into the eyeball through the 3mm surgical incision already made inside the eyeball. The incision at the end of the guide tube facilitates the guide tube to enter and exit the eyeball easily.

[0063] 2. Push the push rod to push the deformable member out of the inner cavity of the guide tube. The deformable portion of the deformable member is pushed into the eyeball and restores the memory shape and opens, so that the deformable portion and the mesh bag connected to the deformable portion open inside the eyeball;

[0064] 3. Rotate the surgical instrument and use auxiliary tools to block the lens nucleus from rotating, so that the annular deformation part wraps the turbid lens nucleus; at this time, pull the push rod, the deformation part and the mesh bag connected to the deformation part automatically tighten to cut the lens nucleus, and the ultrafine wires on the mesh bag can break the turbid and hard lens nucleus into the size of the mesh, so that it is completely broken open, and the deformation part and the mesh bag shrink into the inner cavity of the guide tube. Pull out the surgical instrument, and use the cleaning tool to clean the completely broken turbid matter.

[0065] The present invention adopts a centripetal cutting method for the lens. Since the lens nucleus is cut centripetally mechanically, almost no heat is generated and there is no thermal damage to the intraocular tissue. Centripetal cutting of the lens nucleus is not easy to damage the posterior capsule, suspensory ligament and corneal endothelium. It is simple and easy to learn, with a short operation time and high efficiency, less pain for the patient and a quick recovery. It is simple to operate, convenient and practical, low in cost and does not increase the cost burden on the patient. The surgical incision is small and the number of existing incisions is not increased. There is no need to use ultrasound or laser, thus avoiding the various disadvantages of ultrasonic vibration.

[0066] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A cataract surgical instrument, characterized in that: include: A guide tube (3), wherein an end portion of the guide tube (3) is provided with an incision (31) communicating with an inner cavity (35); A deformable member (2), the deformable member (2) comprising a deformable portion (21) and a connecting portion (22) connected to the deformable portion (21), the connecting portion (22) being disposed in the inner cavity (35) and capable of moving along the axial direction of the guide tube (3); and A mesh bag (1), the mesh bag (1) being connected to the deformation portion (21); The connecting portion (22) drives the deforming portion (21) and the mesh bag (1) to move axially along the guide tube (3), so that the deforming portion (21) and the mesh bag (1) are contracted in the inner cavity (35) or opened outside the inner cavity (35).

2. The cataract surgical instrument according to claim 1, characterized in that: It also includes a push rod (6), which is connected to the connecting portion (22) and is used to drive the connecting portion (22) to move axially along the guide tube (3).

3. The cataract surgical instrument according to claim 2, characterized in that: It also includes an outer tube (4), the guide tube (3) is connected to the outer tube (4), and the push rod (6) is inserted into the outer tube (4) and the guide tube (3) and connected to the connecting portion (22).

4. The cataract surgical instrument according to claim 3, characterized in that: The guide tube (3) comprises a first tube section (32) and a second tube section (33) connected to the first tube section (32); the cutout (31) is located at one end of the first tube section (32) away from the second tube section (33); the outer wall of the second tube section (33) is provided with at least one protrusion (34); the end of the outer tube (4) is provided with an open groove (44) that matches the protrusion (34); and the guide tube (3) is assembled in the open groove (44).

5. The cataract surgical instrument according to claim 4, characterized in that: The interior of the outer tube (4) is provided with a first cavity (41), a second cavity (42) and a third cavity (43) in sequence, the cross section of the second cavity (42) is smaller than the cross sections of the first cavity (41) and the third cavity (43), and the guide tube (3) is assembled in the first cavity (41).

6. The cataract surgical instrument according to claim 5, characterized in that: The push rod (6) includes a first rod body (61) and a second rod body (62), the cross section of the first rod body (61) is smaller than the cross section of the second rod body (62), the second rod body (62) is inserted into the third cavity (43), and the first rod body (61) is inserted into the first cavity (41) and the second cavity (42) and is fixedly connected to the connecting portion (22).

7. The cataract surgical instrument according to claim 6, characterized in that: A push handle (63) is provided at one end of the second rod body (62) facing away from the first rod body (61). The push handle (63) is located outside the outer tube (4) and a plug (5) is provided between the push handle (63) and the outer tube (4).

8. The cataract surgical instrument according to any one of claims 1 to 7, characterized in that: The size of the deformation portion (21) is larger than the size of the inner cavity (35).

9. The cataract surgical instrument according to any one of claims 1 to 7, characterized in that: The deformation portion (21) is an annular structure formed by winding a long strip, the annular structure is an open-loop structure or a closed-loop structure, the material of the long strip is a shape memory material, the height of the long strip is 0.01-2 mm, and the thickness is 0.01-2 mm.

10. The cataract surgical instrument according to claim 9, characterized in that: The mesh bag (1) is a bag-like structure with an opening, which is woven from a plurality of ultrafine wires and formed with a plurality of mesh holes, the diameter of the mesh holes being 0.01-4 mm, and the opening of the mesh bag (1) is connected to the long strip.

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