Trocar for ophthalmic surgery and trocar system including trocar for ophthalmic surgery

Abstract

Provided are a trocar 2 for ophthalmic surgery and a trocar system including the trocar for ophthalmic surgery. The trocar comprises a hollow insertion part 4 on a tip end side and a hollow body part 6 on a rear end side that are connected to each other, and an internal space 8 formed to extend from a tip end opening 4A of the insertion part 4 to a rear end opening 6A of the body part, wherein at least the insertion part 4 has elasticity. In a state in which a knife 20 is placed in the internal space 8 with a blade tip part 22 thereof protruding from the tip end opening 4A, the outer shape of the insertion part 4 is substantially hidden by the outer shape of the blade tip part 22 in a view from the tip end side of the blade tip part 22. When the blade tip part 22 is inserted into an eyeball, the insertion part 4 is also inserted into the eyeball along with the blade tip part 22. Pulling out only the knife 20 from the rear end opening 6A forms an installed state in which the insertion part 4 is positioned in the eyeball and the body part 6 is positioned outside the eyeball, so that the blade tip part 22 can pass through the insertion part 4 as the insertion part 4 is expanded. When a surgical instrument 30 is inserted into the insertion part 4 from the rear end opening 6A in the installed state, the insertion part 4 is expanded, and a tip end part of the surgical instrument 30 is inserted into the eye. Pulling out the surgical instrument 30 from the rear end opening 6A causes the expanded insertion part 4 to return to the original shape. Thus, a surgical instrument having a larger external shape than forceps can be reliably inserted into the eyeball regardless of the skill of the surgeon.

Description

Trocar for ophthalmic surgery and trocar system equipped with the trocar for ophthalmic surgery

[0001] The present invention relates to a trocar for ophthalmic surgery used to insert surgical instruments into the eyeball during ophthalmic surgery.

[0002] In ophthalmic surgery, vitreoretinal surgery, as shown in Patent Document 1, for example, involves inserting a trocar, which has a thin metal tube, into the surface of the eyeball. Forceps can be passed through the trocar, and the tip of the forceps can be inserted into the eyeball. Furthermore, the tip of the forceps can be brought to the fundus to perform retinal surgery. In the surgery described in Patent Document 1, the diameter of the forceps is approximately 0.5 mm, and the forceps are pivoted around the insertion point of the trocar as a fulcrum, so the outer diameter of the trocar is also very small. This makes it possible to insert the metal trocar into the eyeball.

[0003] Patent Publication No. 2022-142902

[0004] However, such trocars cannot be used with larger surgical instruments, such as ultrasonic handpieces used in phacoemulsification of cataracts. If the outer diameter of a metal trocar were expanded to accommodate an ultrasonic handpiece, it would be difficult to insert the trocar into the eyeball without damaging it, which would deform the wound and make it difficult to close.

[0005] Therefore, currently, surgeons use a knife to cut the tissue, create a wound, and then insert the ultrasonic handpiece into the eye. In this case, the ultrasonic handpiece's large external dimensions result in a large wound. Furthermore, the procedure depends on the surgeon's skill, and irregularities in the wound or size can make the surgical procedure unstable and lead to various complications. Furthermore, each time the handpiece is inserted or removed, aqueous humor leaks from the eyeball, causing fluctuations in intraocular pressure and temporarily collapsing or expanding the eyeball, which can apply excessive force to areas inside the eyeball and potentially lead to complications.

[0006] Therefore, an object of the present invention is to provide an ophthalmic surgical trocar that enables surgical instruments having a larger outer diameter than forceps to be reliably inserted into the eyeball regardless of the skill of the surgeon, and a trocar system equipped with this ophthalmic surgical trocar.

[0007] One aspect of the present invention is a trocar in which a hollow insertion portion on the tip side is connected to a hollow main body portion on the rear end side, and an internal space is formed from the tip opening of the insertion portion to the rear opening of the main body portion, and at least the insertion portion is elastic, and when a knife is placed in the internal space so that a cutting edge portion protrudes from the tip opening, the external shape of the insertion portion is generally hidden by the external shape of the cutting edge portion when viewed from the tip side of the cutting edge portion, and when the cutting edge portion is inserted into the inside of the eyeball, the insertion portion is also inserted into the inside of the eyeball along with the cutting edge portion, and by removing only the knife from the rear end opening, an installation state is formed in which the insertion portion is located inside the eyeball and the main body portion is located outside the eyeball, and when the insertion portion expands, the cutting edge portion can pass through the insertion portion, In the installed state, when a surgical instrument is inserted into the insertion portion from the rear end opening, the insertion portion expands and the tip of the surgical instrument is inserted into the eyeball, and when the surgical instrument is removed from the rear end opening, the expanded insertion portion returns to its original shape.This is a trocar for ophthalmic surgery.

[0008] Another aspect of the present invention is an ophthalmic surgical trocar system comprising: the above-mentioned ophthalmic surgical trocar; and the surgical instrument, which is an ultrasonic handpiece, comprising an ultrasonic vibrator having a suction port for sucking in irrigation fluid and the crushed portion, and a sleeve for supplying irrigation fluid, which is arranged to cover the outer surface of the ultrasonic vibrator.

[0009] Yet another aspect of the present invention is an ophthalmic surgical trocar system comprising: the above-mentioned ophthalmic surgical trocar; the surgical instrument being an ultrasonic handpiece equipped with an ultrasonic vibrator having a suction port for sucking in irrigation fluid and the crushed portion; and an infusion trocar for providing irrigation fluid, wherein the ophthalmic surgical trocar is heat resistant.

[0010] As described above, the present invention provides an ophthalmic surgical trocar that enables surgical instruments having a larger outer diameter than forceps to be reliably inserted into the eyeball regardless of the skill of the surgeon, and a trocar system equipped with this ophthalmic surgical trocar.

[0011] 1A and 1B are perspective views showing the external shape of an ophthalmic surgical trocar according to a first embodiment of the present invention, where (a) is a view from the distal end and (b) is a view from the proximal end. This is a view taken along the arrows A-A in FIG. 1A, showing a side view of the ophthalmic surgical trocar as seen from the proximal end. This is a view showing a state in which a knife or a surgical instrument has been inserted into the ophthalmic surgical trocar from the state shown in FIG. 2A. This is a cross-sectional view B-B in FIG. 2A, showing a side cross-section of the ophthalmic surgical trocar and a state in which a knife has been attached to the ophthalmic surgical trocar. This is a view showing the maximum longitudinal dimension Lt1 of the ophthalmic surgical trocar and the maximum width dimension Ln1 of the attached knife. This is a view showing the maximum lateral dimension Lt2 of the ophthalmic surgical trocar and the maximum thickness dimension Ln2 of the attached knife. This is a schematic view showing a state in which the insertion portion of the ophthalmic surgical trocar has been inserted into the interior of the eyeball by inserting the cutting edge of the attached knife into the interior of the eyeball. 5B is a schematic diagram showing the state in which only the knife has been removed from the state shown in FIG. 5A . FIG. 5C is a schematic diagram showing a surgical procedure in which a surgical instrument is inserted into an ophthalmic surgical trocar with an insertion portion inserted inside an eyeball. FIG. 5D is a schematic diagram showing a surgical procedure on an eyeball using an ophthalmic surgical trocar system including an ophthalmic surgical trocar according to a first embodiment of the present invention. FIG. 5E is a side cross-sectional view of an ophthalmic surgical trocar according to a second embodiment of the present invention, particularly showing a surgical procedure in which an insertion portion is inserted inside an eyeball and a surgical instrument is inserted. FIG. 5F is a diagram showing an example of an infusion trocar used together with an ophthalmic surgical trocar according to a second embodiment of the present invention, showing a state in which an irrigation fluid tube attached to an internal region of the main body is folded. FIG. 5G is a diagram showing an example of an infusion trocar used together with an ophthalmic surgical trocar according to the second embodiment of the present invention, showing a state in which irrigation fluid is supplied to the folded irrigation fluid tube to supply fluid into the eyeball. The present invention relates to an ophthalmic surgical trocar system including an infusion trocar and an ophthalmic surgical trocar, and is a perspective view showing an example of a side port sealing member attached to a surgical auxiliary instrument.

[0023] Fig. 1 is a perspective view schematically showing another example of a side port sealing member attached to a surgical auxiliary instrument.

[0024] Fig. 2 is a perspective view schematically showing an example of a contact lens that covers the eyeball during surgery and is used together with an ophthalmic surgical trocar according to a first embodiment of the present invention.

[0025] Fig. 3 is a perspective view schematically showing an example of a contact lens that covers the eyeball during surgery and is used together with an ophthalmic surgical trocar according to a second embodiment of the present invention.

[0012] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Note that the embodiments described below are intended to embody the technical concept of the present invention, and unless otherwise specified, the present invention is not limited to the following. In each drawing, components having the same function may be designated by the same reference numeral. For convenience, embodiments may be shown separately to facilitate explanation or understanding of the main points, but partial substitution or combination of configurations shown in different embodiments is possible. In the embodiments described below, descriptions of matters common to the above-mentioned embodiments will be omitted, and only differences will be described. In particular, similar effects resulting from similar configurations will not be mentioned in each embodiment. The size and positional relationship of components shown in each drawing may be exaggerated for clarity.

[0013] (Ophthalmic Surgical Trocar According to a First Embodiment of the Present Invention) First, an ophthalmic surgical trocar according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4B. FIG. 1 is a perspective view showing the external shape of an ophthalmic surgical trocar according to a first embodiment of the present invention, where (a) is a view from the distal end and (b) is a view from the proximal end. FIG. 2A is a view taken along the arrows A-A in FIG. 1A, showing the ophthalmic surgical trocar from the proximal end. FIG. 2B shows a state in which a knife and surgical instruments have been inserted into the ophthalmic surgical trocar, following the state shown in FIG. 2A. FIG. 3 is a cross-sectional view taken along the line B-B in FIG. 2A, showing a side cross-section of the ophthalmic surgical trocar and further showing a state in which a knife has been attached to the ophthalmic surgical trocar. FIG. 4A shows the maximum longitudinal dimension Lt1 of the ophthalmic surgical trocar and the maximum width Ln1 of the attached knife. FIG. 4B is a diagram showing the maximum width dimension Lt2 of the ophthalmic surgical trocar and the maximum thickness dimension Ln2 of the attached knife.

[0014] The ophthalmic surgical trocar 2 according to this embodiment is configured by integrally connecting a hollow insertion portion 4 at the distal end and a hollow main body portion 6 at the proximal end. An internal space 8 is formed from the distal opening 4A of the insertion portion 4 to the proximal opening 6A of the main body portion 6 (see FIG. 3). In the ophthalmic surgical trocar 2 according to this embodiment, at least the insertion portion 4 is elastic. Any elastic rubber material or resin material, including silicone, can be used as the elastic material for forming the insertion portion 4.

[0015] The insertion portion 4 and the main body portion 6 may have the same elasticity, or the main body portion 6 may be made of a harder material than the insertion portion 4. The degree of elasticity may also be varied in different regions of the insertion portion 4, so that the insertion portion 4 is flexible and stretchable while also having structural rigidity. An ophthalmic surgical trocar 2 with different elasticity regions can be realized, for example, by two-color molding.

[0016] The cross-sectional shape of the insertion portion 4 and the shape of the tip opening 4A are elongated shapes corresponding to the cross-sectional shape of the cutting edge 22 of the knife 20 to be inserted. On the other hand, the main body 6 has an elliptical or circular cross-sectional shape with smaller vertical and horizontal dimensional differences than the insertion portion 4.

[0017] <Dimensions of Insertion Portion and Blade Tip Portion> In this embodiment, the knife 20 is attached to the ophthalmic surgical trocar 2 and used as an integrated set. As shown in Fig. 4A, the maximum width dimension Ln1 of the blade tip of the knife 20 is equal to or greater than the maximum longitudinal dimension Lt1 of the insertion portion 4 of the ophthalmic surgical trocar 2. In other words, there is a relationship of Ln1 ≥ Lt1. Similarly, as shown in Fig. 4B, the maximum width dimension Ln2 of the blade tip of the knife 20 is equal to or greater than the maximum lateral dimension Lt2 of the insertion portion 4 of the ophthalmic surgical trocar 2. In other words, there is a relationship of Ln2 ≥ Lt2.

[0018] In this way, the maximum outer diameter of the cutting edge 22 of the knife 20 is larger than the maximum outer diameter of the insertion portion 4 of the ophthalmic surgical trocar 2 that covers the cutting edge 22, but when the cutting edge 22 is inserted into the insertion portion 4, the insertion portion 4 can elastically expand. Therefore, the cutting edge 22 of the knife 20 passes through the insertion portion 4 and can be set so that the cutting edge 22 protrudes from the distal opening 4A of the insertion portion 4. The internal dimensions of the main body 6 are larger than the external dimensions of the cutting edge 22 of the knife 20, so that they do not interfere with each other. Furthermore, the internal dimensions of the main body 6 are larger than the external dimensions of the surgical instrument 30, which will be described later, so that they do not interfere with each other.

[0019] When the knife 20 is removed from the ophthalmic surgical trocar 2, the insertion portion 4 expands elastically, just as when the knife 20 is inserted into the ophthalmic surgical trocar 2, so that the cutting edge 22 of the knife 20 moves toward the rear end within the insertion portion 4, and only the knife 20 can be removed from the rear end opening 6A of the main body 6.

[0020] In this embodiment, the cutting edge 22 of the knife 20 does not have an edge in the area (see arrows P and Q in FIG. 3 ) that comes into contact with the inner surface of the insertion portion 4 when passing through the insertion portion 4. The area that comes into contact with the inner surface of the insertion portion 4, as indicated by arrows P and Q in FIG. 3 , preferably has a smoothly curved shape.

[0021] In this embodiment, the area of ​​the knife 20 that comes into contact with the inner surface of the insertion portion 4 has no edge, so the knife 20 can be smoothly inserted and removed without damaging the inner surface of the insertion portion 4.

[0022] As described above, the maximum width dimension Ln1 of cutting edge 22 is equal to or greater than the maximum longitudinal dimension Lt1 of the outer shape of insertion portion 4, and the maximum thickness dimension Ln2 of cutting edge 22 is equal to or greater than the maximum lateral dimension Lt2 of the outer shape of insertion portion 4, so that the following is reliably achieved: When knife 20 is placed in internal space 8 so that cutting edge 22 protrudes from distal opening 4A, the outer shape of insertion portion 4 is hidden by the outer shape of cutting edge 22 when viewed from the distal end side of cutting edge 22 (see arrow C in FIG. 3 ).

[0023] <Valve Formed by Elastic Thin Film> As shown in FIGS. 2A and 3 , a valve 12 formed by an elastic thin film 10 is provided near the rear-end opening 6A in the main body 6. The elastic thin film 10 can be formed from any elastic rubber or resin material, such as silicone. In the illustrated example, an opening is formed by a linear slit in the elastic thin film 10, which functions as the valve 12. However, the elastic thin film 10 is not limited to being formed near the rear-end opening 6A of the main body 6. For example, as shown by the dotted line in FIG. 3 , an elastic thin film 10′ can also be formed in the boundary region between the insertion section 4 and the main body 6. Furthermore, the elastic thin films 10, 10′ can also be formed both near the rear-end opening 6A of the main body 6 and in the boundary region between the insertion section 4 and the main body 6.

[0024] When the knife 20 or surgical instrument 30 is not inserted into the ophthalmic surgical trocar 2, the opening of the valve 12 is generally closed, preventing aqueous humor from leaking out from within the eyeball. On the other hand, even when the knife 20 or surgical instrument 30 is inserted into the ophthalmic surgical trocar 2, the opening of the valve 12 deforms to conform to the outer shape of the inserted knife 20 or surgical instrument 30, as shown in FIG. 2B , thereby maintaining a sealed state to the greatest extent possible. This makes it possible to appropriately prevent aqueous humor from leaking out from within the eyeball, even when the knife 20 or surgical instrument 30 is inserted into the ophthalmic surgical trocar 2. Considering the strength required when the knife 20 or surgical instrument 30 is inserted, the thickness of the elastic thin film 10 can be, for example, approximately 0.3 to 1.5 mm.

[0025] As described above, in this embodiment, the valve 12 formed by the elastic thin film 10 is provided inside the main body 6, and when the knife 20 or surgical instrument 30 is inserted into the main body 6 from the rear end opening 6A, the opening of the valve 12 expands in accordance with the outer shape of the knife 20 or surgical instrument 30, and when the knife 20 or surgical instrument 30 is removed from the rear end opening 6A, the opening of the valve 12 closes.

[0026] In this way, the elastic thin film 10 can maintain a sealed state when the knife 20 or surgical instrument 30 is inserted and even after it is removed, thereby reliably preventing aqueous humor from leaking out of the eyeball.

[0027] In the illustrated example, the opening is formed by a slit extending linearly in the elastic thin film 10, but this is not limited thereto. For example, the slit may extend in a meandering or zigzag pattern relative to the extension direction. The angle at which the slit extends relative to the extension direction can be any angle, with a maximum angle being perpendicular. The shape of the slit may be a shape of connected straight lines, a shape of connected curves, or a shape that combines straight lines and curves. In any case, it is preferable to adopt a shape that provides high sealing properties and followability depending on the outer shape of the inserted member.

[0028] <Method of Using the Ophthalmic Surgical Trocar> Next, a method of using the ophthalmic surgical trocar 2 according to this embodiment will be described with reference to Figures 5A to 5C. Figure 5A is a schematic diagram showing a state in which the insertion portion of the ophthalmic surgical trocar is inserted into the interior of the eyeball by inserting the cutting edge of the attached knife into the interior of the eyeball. Figure 5B is a schematic diagram showing a state in which only the knife has been removed from the state shown in Figure 5A. Figure 5C is a schematic diagram showing a state in which a surgical instrument is inserted into the ophthalmic surgical trocar with the insertion portion inserted into the interior of the eyeball to perform surgery.

[0029] As described above, when the knife 20 is placed in the internal space 8 of the ophthalmic surgical trocar 2 so that the cutting edge 22 protrudes from the distal opening 4A of the insertion portion 4, the outer shape of the insertion portion 4 is hidden by the outer shape of the cutting edge 22 when viewed from the distal end of the cutting edge 22. Therefore, when the cutting edge 22 is inserted into the interior of an eyeball with the ophthalmic surgical trocar 2 and the knife 22 integrated, the insertion portion 4 is also inserted into the interior of the eyeball along with the cutting edge 22 (see FIG. 5A ).

[0030] As described above, the interior of the main body 6 of the ophthalmic surgical trocar 2 is larger than the outer shape of the cutting edge 22 of the knife 20. At least a portion of the outer shape of the main body 24 of the knife 20 is formed to be larger than the outer shape of the main body 6. As a result, an abutment surface 6B that abuts against the front surface 24A of the main body 24 of the knife 20 is formed at the rear end of the main body 6 of the ophthalmic surgical trocar 2. As a result, when the cutting edge 22 is inserted into the interior of the eyeball, the insertion portion 4 is pushed by the main body 24 of the knife 20 via the abutment surface 6B, and the insertion portion 4 is inserted into the interior of the eyeball along with the cutting edge 22.

[0031] In this way, when the cutting edge portion 22 is inserted into the inside of the eyeball, the insertion portion 4 is also pushed toward the insertion side via the abutment surface 6B, so that the insertion portion 4 is reliably inserted into the inside of the eyeball together with the cutting edge portion 22.

[0032] As described above, when viewed from the distal end of the cutting edge 22, the outer shape of the insertion portion 4 is hidden by the outer shape of the cutting edge 22, but even if the outer shape of the insertion portion 4 were to extend slightly outward from the outer shape of the cutting edge 22, interference with the eyeball would be extremely limited, and it is believed that the insertion portion 4 of the ophthalmic surgical trocar 2 would also be inserted relatively smoothly into the eyeball along with the cutting edge 22 of the knife 20. In particular, with regard to the shorter direction of the insertion portion 4, even if the outer shape of the insertion portion 4 were to extend slightly outward from the outer shape of the cutting edge 22, the degree of contact between the cutting edge 22 and the insertion portion 4 would be high, and the insertion portion 4 would also be inserted relatively smoothly into the eyeball.

[0033] Furthermore, the insertion portion 4 is also pushed from the rear side via the contact surface 6B, so that the insertion portion 4 is more reliably inserted into the eyeball. Taking these factors into consideration, it can be said that the insertion portion 4 is also inserted into the eyeball if the outer shape of the cutting edge 22 is largely hidden by the outer shape of the cutting edge 22 when viewed from the tip side of the cutting edge 22.

[0034] Next, by removing only the knife 20 from the rear end opening 6A of the ophthalmic surgical trocar 2, an installation state is established in which the insertion portion 4 is located inside the eyeball and the main body portion 6 is located outside the eyeball, as shown in Figure 5B. At this time, the insertion portion 4 of the ophthalmic surgical trocar 2 elastically expands, and there is no edge in the area of ​​the knife 20 that contacts the inner surface of the insertion portion 4, so that only the knife 20 can be smoothly removed. This establishes an installation state in which the insertion portion 4 of the ophthalmic surgical trocar 2 is located inside the eyeball and the main body portion 6 is located outside the eyeball, as shown in Figure 5B.

[0035] Basically, the eyeball is simply pierced with the cutting edge 22 of the knife 20 integrated with the insertion portion 4, so the insertion portion 4 can be reliably inserted into the eyeball without relying on the skill of the surgeon, shortening the time required for installation and improving work efficiency. In the installed state after the knife 20 is removed, the valve 12, which closes the opening of the elastic thin film 10 located near the rear end opening 6A, is in a closed state, preventing aqueous humor from leaking out of the eyeball.

[0036] In this installed state, a surgical instrument 30 is inserted through the rear end opening 6A of the ophthalmic surgical trocar 2. When the surgical instrument 30 is inserted, the opening of the elastic thin film 10 located near the rear end opening 6A deforms in accordance with the outer shape of the surgical instrument 30, allowing the surgical instrument 30 to pass through. At this time, the deformation is such that the sealing performance is maintained as much as possible, and the outflow of aqueous humor from the eyeball can be suppressed.

[0037] In the installed state, when the surgical instrument 30 is not present, the insertion portion 4 of the ophthalmic surgical trocar 2 is pushed from the outside by the pressure of aqueous humor and ocular tissue, resulting in a nearly collapsed internal space. When the surgical instrument 30 is inserted into the insertion portion 4, the insertion portion 4 elastically expands to conform to the outer shape of the surgical instrument 30. At this time, the portion of the eyeball that covers the insertion portion 4 also expands in accordance with the expansion of the insertion portion 4. Because the insertion portion 4 does not move in the insertion direction, the eyeball is not damaged. The eyeball can expand in response to the expansion of the insertion portion 4, preventing the outflow of aqueous humor from within the eyeball. This allows the distal end region of the surgical instrument 30 to be positioned inside the eyeball, allowing surgery to be performed.

[0038] The ophthalmic surgical trocar 2 according to the first embodiment is adapted to allow insertion of a surgical instrument 30, which is an ultrasonic handpiece with an irrigation sleeve. As shown in FIG. 5C , the surgical instrument 30 is primarily composed of an ultrasonic transducer 32 and an irrigation sleeve 34 that covers the outer surface of the ultrasonic transducer 32. The ultrasonic transducer 32 generates a fragmented portion by, for example, irrigating the crystalline lens with ultrasonic waves. An irrigation fluid flows between the inner surface of the irrigation sleeve 34 and the outer surface of the ultrasonic transducer 32, and flows into the eyeball through an opening 34A at the tip. The fragmented portion is aspirated together with aqueous humor and irrigation fluid through an opening 32A at the tip of the ultrasonic transducer 32.

[0039] Although the ultrasonic transducer 32 becomes hot during operation, the temperature of the outer surface of the irrigation sleeve 34 that covers the outside does not become high because the irrigation fluid flows on the outside. Therefore, the ophthalmic surgical trocar 2 according to the first embodiment can be formed from a material that is or is not heat-resistant.

[0040] The outer diameter of the surgical instrument 30 that passes through such an insertion portion 4 can be, for example, in the range of 1.5 mm to 4 mm. Even if a metal trocar were created to allow passage of a surgical instrument 30 of this size, it would be impossible to insert the insertion portion into the eyeball without damaging the eyeball. As described above, by using a set of an ophthalmic surgical trocar 2 having an elastic insertion portion 4 and a knife 20 integrated therewith, it is possible for the first time to place a large insertion portion 4 inside the eyeball that allows passage of a surgical instrument 30 with an outer diameter of 1.5 mm to 4 mm.

[0041] After the surgery using the surgical instrument 30 is completed, when the surgical instrument 30 is removed, the elastically deformed insertion portion 4 is pushed from the outside by the pressure of the aqueous humor and ocular tissue, and returns to its original shape. Since the insertion portion 4 does not move even when the surgical instrument 30 is removed, the problem of aqueous humor leaking out of the eye, which has been a conventional problem, can be avoided.

[0042] As described above, the ophthalmic surgical trocar 2 according to the first embodiment of the present invention is a trocar in which the hollow insertion portion 4 on the tip side and the hollow main body portion 6 on the rear end side are connected, and an internal space 8 is formed from the tip opening 4A of the insertion portion 4 to the rear opening 6A of the main body portion, and at least the insertion portion 4 is elastic. When the knife 20 is placed in the internal space 8 so that the cutting edge 22 protrudes from the tip opening 4A, the external shape of the insertion portion 4 is mostly hidden by the external shape of the cutting edge 22 when viewed from the tip side of the cutting edge 22, and when the cutting edge 22 is inserted into the inside of the eyeball, the insertion portion 4 and the cutting edge 22 are also hidden by the external shape of the cutting edge 22. The knife 20 is inserted into the eyeball along with the tip 22, and by removing only the knife 20 from the rear end opening 6A, an installed state is formed in which the insertion portion 4 is located inside the eyeball and the main body portion 6 is located outside the eyeball, and as the insertion portion 4 expands, the cutting edge portion 22 can pass through the insertion portion 4. In the installed state, when a surgical instrument 30 is inserted into the insertion portion 4 from the rear end opening 6A, the insertion portion 4 expands and the tip of the surgical instrument 30 is inserted into the eyeball, and when the surgical instrument 30 is removed from the rear end opening 6A, the expanded insertion portion 4 returns to its original shape.

[0043] The outer shape of the cutting edge 22 of the knife 20 is larger than the outer shape of the insertion portion 4 of the ophthalmic surgical trocar 2. However, because the insertion portion 4 elastically expands, the cutting edge 22 can pass through the insertion portion 4 and be set so that it protrudes from the distal opening 4A of the insertion portion 4. When viewed from the distal end of the cutting edge 22, the outer shape of the insertion portion 4 is largely hidden by the outer shape of the cutting edge 22. Therefore, when the cutting edge 22 is inserted into the interior of the eyeball, the insertion portion 4 can also be inserted into the interior of the eyeball along with the cutting edge 22. By removing only the knife 22, an installation state in which the insertion portion 4 is located inside the eyeball and the main body 6 is located outside the eyeball can be easily achieved. Furthermore, because the insertion portion 4 elastically deforms when removing the knife 20, the knife alone can be removed while the insertion portion remains inside the eyeball.

[0044] Basically, the knife 20 integrated with the insertion part 4 is simply inserted into the eyeball, so it does not depend on the skill of the surgeon, the insertion part can be reliably inserted into the eyeball, the time required for installation can be shortened, and the work efficiency is improved.

[0045] In the installed state, when a relatively large surgical instrument 30 is inserted or removed, the insertion portion 4 elastically deforms but does not move in the insertion direction, so the eyeball follows and the outflow of aqueous humor from the eyeball is suppressed. In this way, the surgical instrument 30, such as a surgical handpiece, can be inserted and removed safely and reliably, preventing injuries such as crushing or burns to the wound.

[0046] This makes it possible to provide a trocar for ophthalmic surgery that enables a surgical instrument having a larger outer shape than forceps to be reliably inserted into the eyeball, regardless of the skill of the surgeon.

[0047] In this embodiment, the insertion portion 4 of the ophthalmic surgical trocar 2 can be maintained in an installed state within the eyeball, and not only the surgical instrument 30, which is an ultrasonic handpiece with an irrigation sleeve for cataract surgery, but also other surgical instruments can be inserted to continue performing vitreous surgery, etc. Furthermore, the ophthalmic surgical trocar 2 according to this embodiment can be applied not only to cataract surgery, but also to glaucoma surgery, corneal transplants, and various other eye surgeries.

[0048] (Ophthalmic surgical trocar system according to the first embodiment of the present invention) Next, a trocar system for ophthalmic surgery equipped with the trocar 2 for ophthalmic surgery according to the first embodiment will be briefly described with reference to Fig. 6. Fig. 6 is a diagram schematically illustrating the performance of eye surgery using the trocar system for ophthalmic surgery equipped with the trocar for ophthalmic surgery according to the first embodiment of the present invention.

[0049] This ophthalmic surgical trocar system comprises at least the ophthalmic surgical trocar 2 according to the first embodiment described above, and a surgical instrument 30 which is an ultrasonic handpiece comprising an ultrasonic vibrator 32 having an opening 32A for aspirating irrigation fluid and the crushed portion, and an irrigation sleeve 34 for supplying irrigation fluid, which is arranged to cover the outer surface of the ultrasonic vibrator 32.

[0050] 6 shows the surgical procedure being performed using a hook-shaped surgical auxiliary instrument 70. A side port sealing member 50 is attached to the surgical auxiliary instrument 70 to prevent aqueous humor from leaking from the eyeball. The side port sealing member 50 will be described in detail later with reference to FIGS. 10A and 10B.

[0051] The ophthalmic surgical trocar system, which includes at least the ophthalmic surgical trocar 2 according to the first embodiment and the surgical instrument 30, which is an ultrasonic handpiece capable of supplying irrigation fluid, allows the surgeon, regardless of his or her skill level, to safely and reliably insert and remove the surgical instrument, thereby enabling cataract surgery to be performed reliably while preventing damage such as crushing or burns to the wound.

[0052] (Ophthalmic Surgical Trocar According to a Second Embodiment of the Present Invention) Next, an ophthalmic surgical trocar according to a second embodiment of the present invention will be described with reference to FIGS. 7 to 8B. FIG. 7 is a side cross-sectional view of the ophthalmic surgical trocar according to the second embodiment of the present invention, and in particular, is a schematic view showing the insertion portion inserted into the interior of an eyeball and the insertion of surgical instruments to perform surgery. FIGS. 8A and 8B are views showing an example of an infusion trocar used with the ophthalmic surgical trocar according to the second embodiment of the present invention. FIG. 8A shows a state in which the irrigation fluid tube attached to the interior region of the main body is folded, and FIG. 8B shows a state in which irrigation fluid is supplied to the folded irrigation fluid tube to supply irrigation fluid into the eyeball. In FIGS. 8A and 8B, (a) is a view of the infusion trocar 40 as seen from the rear end opening 44A of the main body 44, and (b) is a side cross-sectional view showing section D-D of (a) .

[0053] The ophthalmic surgical trocar 2' according to the second embodiment of the present invention has a structure basically similar to that of the first embodiment described above. However, the ophthalmic surgical trocar 2' according to this embodiment is adapted to allow insertion of a surgical instrument 30', which is an ultrasonic handpiece without an irrigation sleeve. Because the irrigation sleeve is not provided, the external dimensions of the surgical instrument 30' are smaller. Therefore, the external dimensions of the ophthalmic surgical trocar 2' according to the second embodiment can also be made smaller than those of the first embodiment. This allows the insertion section 4 to be inserted into the eyeball more easily.

[0054] However, since the ultrasonic transducer 32 becomes hot during operation and there is no irrigation sleeve or the like covering the outside, it is preferable that the ophthalmic surgical trocar 2' according to the second embodiment be made of a heat-resistant material.

[0055] In this embodiment, an infusion trocar 40 is used to supply perfusion fluid into an eyeball during eye surgery. The infusion trocar 40 has a structure similar to that of the ophthalmic surgical trocar 2 described above. Specifically, a hollow insertion portion 42 at the distal end is connected to a hollow main body portion 44 at the proximal end, and an internal space 46 is formed from a distal opening 42A of the insertion portion 42 to a proximal opening 44A of the main body portion 44, with at least the insertion portion 42 being elastic. In a manner similar to that of the ophthalmic surgical trocar 2 described above, an installation state can be achieved in which the insertion portion 42 of the infusion trocar 40 is placed inside the eyeball and the main body portion 44 is placed outside the eyeball.

[0056] The infusion trocar 40 further has an irrigation fluid tube 48 attached to the internal region of the main body portion 44 of the internal space 46. As shown in Fig. 8A, when the irrigation fluid tube 48 is folded, there is space in the main body portion 44 for placing the knife 20. Fig. 8A shows the knife 20 used to insert the insertion portion 42 into the eyeball being removed from the infusion trocar 40.

[0057] The irrigation fluid tube 48 is made of a highly waterproof and elastic resin or rubber material. When irrigation fluid is supplied from the irrigation fluid supply source after the knife 20 is withdrawn from the rear end opening 44A, the irrigation fluid tube 48 unfolds due to the fluid pressure of the irrigation fluid, contacting the entire inner surface of the main body 44 and forming a sealed state, as shown in FIG. 8B . This allows irrigation fluid to be reliably supplied into the eyeball while preventing leakage. The irrigation fluid tube 48 preferably has a thickness that provides sufficient rigidity to maintain a seal, except for the area where the knife 20 is inserted. The portion of the irrigation fluid tube 48 located in the area where the knife 20 is inserted is preferably thinner than the other areas to ensure sufficient flexibility.

[0058] In this way, the insertion section 42 of the infusion trocar 40 can be reliably inserted into the eyeball regardless of the surgeon's skill, and since the irrigation fluid tube 48 is pre-attached, the state in which irrigation fluid is supplied can be achieved with minimal labor. The folded, elastic irrigation fluid tube 48 allows the knife 20 to be inserted and removed without interference when the trocar is attached, and simply supplying irrigation fluid creates a sealed state with hydraulic pressure, ensuring that irrigation fluid is supplied into the eyeball.

[0059] (Ophthalmic surgical trocar system according to a second embodiment of the present invention) Next, a trocar system for ophthalmic surgery including the trocar 2 for ophthalmic surgery according to the second embodiment will be briefly described with reference to Fig. 9. Fig. 9 is a diagram schematically illustrating the performance of eye surgery using the trocar system for ophthalmic surgery including the trocar for ophthalmic surgery and an infusion trocar according to the second embodiment of the present invention.

[0060] This ophthalmic surgical trocar system comprises at least the ophthalmic surgical trocar 2 according to the second embodiment described above, a surgical instrument 30' which is an ultrasonic handpiece equipped with an ultrasonic vibrator 32' having an opening 32A' for aspirating the irrigation fluid and the crushed portion, and an infusion trocar 40 for providing the irrigation fluid, and the ophthalmic surgical trocar 2' is heat resistant.

[0061] 9 also shows that surgery is performed using a hook-shaped surgical auxiliary instrument 70. A side port seal member 50 for preventing aqueous humor from leaking out of the eyeball is attached to the surgical auxiliary instrument 70. The side port seal member 50 will be described in detail later with reference to FIGS. 10A and 10B.

[0062] In this system, the surgical instrument 30', which is an ultrasonic handpiece, does not have an irrigation sleeve arranged to cover the outer surface of the ultrasonic transducer 32', allowing the outer size of the surgical instrument 30' to be reduced. This also allows the outer size of the ophthalmic surgical trocar 2' to be reduced, making it easier to insert the ophthalmic surgical trocar 2' into the eyeball. Furthermore, the separate infusion trocar 40 allows for more flexible adjustment of the flow of irrigation fluid within the eyeball.

[0063] (Side port seal member) Next, a side port seal member to be attached to a surgical auxiliary instrument will be described with reference to Figures 10A and 10B. Figure 10A is a perspective view showing one example of a side port seal member to be attached to a surgical auxiliary instrument. Figure 10B is a perspective view showing another example of a side port seal member to be attached to a surgical auxiliary instrument.

[0064] The side port sealing member 50 attached to the hook-shaped surgical auxiliary instrument 70 is elastic and stretchable. Therefore, it is preferable that the side port sealing member 50 be formed from any elastic rubber or resin material, such as silicone. Because the surgical auxiliary instrument 70 has a small external shape, a side port can be created by conventional procedures performed by the surgeon without using a trocar, and the tip of the surgical auxiliary instrument 70 can be inserted into the interior of the eyeball. At this time, the side port sealing member 50 attached to the surgical auxiliary instrument 70 is positioned in the boundary region between the inside and outside of the eyeball.

[0065] 10A, the side port sealing member 50 has a smoothly curved shape, while in the example shown in Fig. 10B, the side port sealing member 50 has an expandable bellows shape. The side port sealing member 50 preferably has an optimal shape depending on the shape of the surgical auxiliary instrument 70. In either case, the elastic side port sealing member 50 can prevent aqueous humor and the like from leaking out from within the eyeball.

[0066] The ophthalmic surgical trocar system equipped with the ophthalmic surgical trocar 2, 2' according to the first or second embodiment described above further includes an elastic, stretchable side port seal member 50 that covers the exterior of the surgical auxiliary instrument 70. When the tip of the surgical auxiliary instrument 70 is inserted into the eyeball through a side port provided in the eyeball, the side port seal member 50 can suppress the outflow of aqueous humor and the like from the side port.

[0067] In this way, because the external shape of the surgical auxiliary instrument 70 is small, a side port can be created in the eyeball without using a trocar with a knife. When the tip of the surgical auxiliary instrument 70 is inserted into the eyeball, the side port seal member 50 can reliably prevent aqueous humor and the like from leaking out of the side port.

[0068] Regardless of the sealing effect of side port seal member 50, even if a small amount of aqueous humor or the like leaks out from the side port, guide groove 52 is formed to discharge the outflowing liquid to an area where it is unlikely to affect the surgery. Because side port seal member 50 is formed with guide groove 52 that guides the flow of aqueous humor or the like that leaks out from the side port, the leaked aqueous humor can be disposed of without interfering with the surgery.

[0069] (Contact Lens) Next, a contact lens that covers the eyeball during surgery will be described with reference to Figures 11A and 11B. Figure 11A is a perspective view that schematically shows an example of a contact lens that covers the eyeball during surgery and is used with an ophthalmic surgical trocar according to the first embodiment of the present invention. Figure 11B is a perspective view that schematically shows an example of a contact lens that covers the eyeball during surgery and is used with an ophthalmic surgical trocar according to the second embodiment of the present invention.

[0070] During surgery, if the surface of the eyeball dries out, it becomes cloudy, making it difficult for the surgeon to see inside the eyeball. To address this issue, a method of covering the eyeball with a hydrophobic or water-repellent contact lens has been put into practical use, but this cannot be used because it interferes with the above-mentioned ophthalmic surgical trocars 2, 2', infusion trocar 40, surgical auxiliary instrument 70, etc.

[0071] For this reason, the ophthalmic surgical trocar system equipped with the ophthalmic surgical trocars 2, 2' according to the first and second embodiments is equipped with a contact lens 60 as shown in Figures 11A and 11B. More specifically, the contact lens 60 used with the ophthalmic surgical trocars 2, 2' according to the first and second embodiments covers the eyeball during surgery, is hydrophobic or water-repellent, and has a notch 62 to avoid interference with instruments inserted into the eyeball.

[0072] The contact lens 60 shown in Fig. 11A is a contact lens provided in an ophthalmic surgical trocar system including the ophthalmic surgical trocar 2 according to the first embodiment, and has two cutout portions 62 corresponding to the ophthalmic surgical trocar 2 and the surgical auxiliary instrument 70. The contact lens 60 shown in Fig. 11B is a contact lens provided in an ophthalmic surgical trocar system including the ophthalmic surgical trocar 2 according to the second embodiment, and has four cutout portions 62 corresponding to the ophthalmic surgical trocar 2', the infusion trocar 40, the surgical auxiliary instrument 70, and other components.

[0073] As described above, by covering the eyeball with a hydrophobic or water-repellent contact lens having the cutout 62, visibility of the inside of the eyeball can be ensured during surgery without interfering with surgical instruments. Note that the above embodiment is only an example up to the stage of opening, and any number of cutouts can be provided and the lens can be made of any other material as long as it does not interfere with the trocar.

[0074] (General Description) (1) A first embodiment of the present invention is a trocar in which a hollow insertion portion on the tip side and a hollow main body portion on the rear end side are connected, an internal space is formed from the tip opening of the insertion portion to the rear opening of the main body portion, and at least the insertion portion is elastic, and when a knife is placed in the internal space so that a cutting edge portion protrudes from the tip opening, the external shape of the insertion portion is generally hidden by the external shape of the cutting edge portion when viewed from the tip side of the cutting edge portion, and when the cutting edge portion is inserted into the inside of the eyeball, the insertion portion is also inserted into the inside of the eyeball along with the cutting edge portion, and by removing only the knife from the rear end opening, an installation state is formed in which the insertion portion is located inside the eyeball and the main body portion is located outside the eyeball, and when the insertion portion expands, the cutting edge portion can pass through the insertion portion, In the installed state, when a surgical instrument is inserted into the insertion portion through the rear-end opening, the insertion portion expands, inserting the tip of the surgical instrument into the eyeball, and when the surgical instrument is removed from the rear-end opening, the expanded insertion portion returns to its original shape. (2) A second embodiment of the present invention is the ophthalmic surgical trocar of the first embodiment, characterized in that the outer diameter of the surgical instrument passing through the insertion portion is in the range of 1.5 mm to 4 mm. (3) A third embodiment of the present invention is the ophthalmic surgical trocar of the first or second embodiment, characterized in that the maximum width dimension of the cutting edge portion is equal to or greater than the maximum length dimension of the outer shape of the insertion portion, and the maximum thickness dimension of the cutting edge portion is equal to or greater than the maximum width dimension of the outer shape of the insertion portion. (4) A fourth embodiment of the present invention is a trocar for ophthalmic surgery according to any one of the first to third embodiments, characterized in that the rear end of the main body has an abutment surface that abuts against the front surface of the knife body, and when the cutting edge is inserted into the inside of the eyeball, the cutting edge is pushed by the knife body via the abutment surface, and the insertion part is inserted into the inside of the eyeball along with the cutting edge. (5) A fifth embodiment of the present invention is a trocar for ophthalmic surgery according to any one of the first to fourth embodiments, characterized in that no edge is formed in the area of ​​the cutting edge that contacts the inner surface of the insertion part when passing through the insertion part.(6) A sixth embodiment of the present invention is an ophthalmic surgical trocar according to any one of the first to fifth embodiments, characterized in that a valve formed by an elastic thin film is provided in the main body, and when the knife or the surgical instrument is inserted into the main body from the rear end opening, the opening of the valve expands in accordance with the outer shape of the knife or the surgical instrument, and when the knife or the surgical instrument is removed from the rear end opening, the opening of the valve closes.

[0075] (7) A seventh embodiment of the present invention is an ophthalmic surgical trocar system comprising: the ophthalmic surgical trocar according to any one of the first to sixth embodiments; and the surgical instrument, which is an ultrasonic handpiece, including an ultrasonic vibrator having a suction port for aspirating irrigation fluid and the fragmented portion, and an irrigation sleeve for supplying irrigation fluid, the ophthalmic surgical trocar system being characterized by comprising: the ophthalmic surgical trocar according to any one of the first to sixth embodiments; the surgical instrument, which is an ultrasonic handpiece, including an ultrasonic vibrator having a suction port for aspirating irrigation fluid and the fragmented portion, and an irrigation sleeve arranged to cover the outer surface of the ultrasonic vibrator; and an infusion trocar for providing irrigation fluid, the ophthalmic surgical trocar system being characterized by being heat resistant. (9) A ninth embodiment of the present invention is a trocar system for ophthalmic surgery according to the eighth embodiment, characterized in that the infusion trocar has a structure similar to that of the trocar for ophthalmic surgery according to the first embodiment, and further comprises an irrigation fluid tube attached to an internal region of a main body of the internal space, and when the irrigation fluid tube is folded, a space for placing a knife is present within the main body, and when the knife is withdrawn from the rear end opening and irrigation fluid is supplied, the irrigation fluid tube, which was folded by the hydraulic pressure of the irrigation fluid, expands and contacts the entire inner surface of the main body to form a sealed state. (10) A tenth embodiment of the present invention is a trocar system for ophthalmic surgery according to any one of the seventh to ninth embodiments, further comprising an elastic, stretchable side port seal member covering the exterior of a surgical auxiliary instrument, and when the tip of the surgical auxiliary instrument is inserted into the eyeball through a side port provided in the eyeball, the side port seal member prevents aqueous humor from flowing out of the side port. (11) An eleventh embodiment of the present invention is a trocar system for ophthalmic surgery according to the tenth embodiment, characterized in that the side port seal member is formed with a groove for guiding the flow of aqueous humor that has flowed out of the side port.(12) A twelfth embodiment of the present invention is a trocar system for ophthalmic surgery, characterized in that, in any one of the seventh to eleventh embodiments, the system further comprises a hydrophobic or water-repellent contact lens that covers the eyeball during surgery and has a cutout portion for avoiding interference with instruments inserted into the eyeball.

[0076] Although an embodiment of the present invention has been described, the disclosed contents may vary in the details of the configuration, and changes in the combination and order of elements in the embodiment may be realized without departing from the scope and spirit of the claimed invention.

[0077] 2, 2' Ophthalmic surgical trocar 4, 4' Insertion section 4A, 4A' Tip opening 6, 6' Main body section 6A, 6A' Rear end opening 8, 8' Internal space 10, 10' Elastic thin film 12 Valve 20 Knife 22 Cutting edge section 24 Main body 30, 30' Surgical instrument 32 Ultrasonic transducer 32A Opening 34 Irrigation sleeve 34A Opening 40 Infusion trocar 42 Insertion section 42A Tip opening 44 Main body section 44A Rear end opening 46 Internal space 48 Irrigation fluid tube 50 Side port seal member 52 Guide groove 60 Contact lens 70 Surgical auxiliary instrument

Claims

1. A trocar in which a hollow insertion part at the tip side is connected to a hollow main body part at the rear end side, an internal space is formed from the tip opening of the insertion part to the rear opening of the main body part, and at least the insertion part has elasticity, and when a knife is placed in the internal space so that the cutting edge protrudes from the tip opening, the outer shape of the insertion part is mostly hidden by the outer shape of the cutting edge when viewed from the tip side of the cutting edge, and when the cutting edge is inserted into the inside of the eyeball, the insertion part is inserted into the inside of the eyeball together with the cutting edge, and when only the knife is removed from the rear opening, an installation state is formed in which the insertion part is located inside the eyeball and the main body part is located outside the eyeball, and when the insertion part expands, the cutting edge can pass through the insertion part, In the installed state, when a surgical instrument is inserted into the insertion portion from the rear end opening, the insertion portion expands and the tip of the surgical instrument is inserted into the eyeball, and when the surgical instrument is removed from the rear end opening, the expanded insertion portion returns to its original shape.

2. An ophthalmic surgical trocar as described in claim 1, characterized in that the outer diameter of the surgical instrument passing through the insertion portion is in the range of 1.5 mm to 4 mm.

3. An ophthalmic surgical trocar as described in claim 1, characterized in that the maximum width dimension of the cutting edge portion is equal to or greater than the maximum longitudinal dimension of the outer shape of the insertion portion, and the maximum thickness dimension of the cutting edge portion is equal to or greater than the maximum lateral dimension of the outer shape of the insertion portion.

4. An ophthalmic surgical trocar as described in claim 1, characterized in that the rear end of the main body has an abutment surface that abuts against the front surface of the knife body, and when the cutting edge is inserted into the inside of the eyeball, the knife body presses against the abutment surface, causing the insertion portion to be inserted into the inside of the eyeball along with the cutting edge.

5. An ophthalmic surgical trocar as described in claim 1, characterized in that no edge portion is formed in the area of ​​the cutting edge that comes into contact with the inner surface of the insertion portion when passing through the insertion portion.

6. An ophthalmic surgical trocar as described in claim 1, characterized in that a valve formed by an elastic thin film is provided within the main body, and when the knife or surgical instrument is inserted into the main body from the rear end opening, the opening of the valve expands in accordance with the outer shape of the knife or surgical instrument, and when the knife or surgical instrument is removed from the rear end opening, the opening of the valve closes.

7. An ophthalmic surgical trocar system comprising: the ophthalmic surgical trocar according to any one of claims 1 to 6; and the surgical instrument which is an ultrasonic handpiece comprising an ultrasonic transducer having an inlet for sucking in irrigation fluid and the crushing portion, and an irrigation sleeve for supplying irrigation fluid, the irrigation sleeve being arranged to cover the outer surface of the ultrasonic transducer.

8. A trocar system for ophthalmic surgery comprising: the ophthalmic surgical trocar according to any one of claims 1 to 6; the surgical instrument being an ultrasonic handpiece equipped with an ultrasonic transducer having a suction port for sucking in irrigation fluid and the crushed portion; and an infusion trocar for providing irrigation fluid, wherein the ophthalmic surgical trocar is heat resistant.

9. An ophthalmic surgical trocar system as described in claim 8, characterized in that the infusion trocar has a structure similar to that of the ophthalmic surgical trocar described in claim 1, and further has an irrigation fluid tube attached to the internal region of the main body of the internal space, and when the irrigation fluid tube is folded, there is a space in the main body for placing a knife, and when the knife is pulled out from the rear end opening and irrigation fluid is supplied, the irrigation fluid tube, which was folded, expands due to the hydraulic pressure of the irrigation fluid and comes into contact with the entire inner circumference of the main body to form a seal.

10. The ophthalmic surgical trocar system according to claim 7, further comprising an elastic, stretchable side port sealing member covering the exterior of the surgical auxiliary instrument, wherein when the tip of the surgical auxiliary instrument is inserted into the eyeball through a side port provided in the eyeball, the side port sealing member suppresses the outflow of aqueous humor from the side port.

11. A trocar system for ophthalmic surgery as described in claim 10, characterized in that said side port seal member is formed with a groove for guiding the flow of aqueous humor flowing out from said side port.

12. The trocar system for ophthalmic surgery as described in claim 7, further comprising a hydrophobic or water-repellent contact lens which covers the eyeball during surgery and has a cutout to avoid interference with instruments inserted into the eyeball.

13. The ophthalmic surgical trocar system according to claim 8, further comprising an elastic, stretchable side port sealing member for covering the exterior of the surgical auxiliary instrument, wherein when the surgical auxiliary instrument is inserted into the eyeball through a side port provided in the eyeball, the side port sealing member suppresses the outflow of aqueous humor from the side port.

14. A trocar system for ophthalmic surgery as described in claim 13, characterized in that the side port seal member is formed with a guide groove for guiding the flow of aqueous humor flowing out from the side port.

15. The trocar system for ophthalmic surgery as described in claim 8, further comprising a hydrophobic or water-repellent contact lens that covers the eyeball during surgery and has a cutout to avoid interference with instruments inserted into the eyeball.

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