Vitreous cutting device

Abstract

The present invention relates to ophthalmic surgical devices, systems, and methods, and in particular to a vitrectomy device having a rotating inner tube.

Description

TECHNICAL FIELD

[0001] The present invention relates to ophthalmic surgical devices, systems, and methods, and in particular to a vitrectomy device having a rotating inner tube. BACKGROUND

[0002] Microsurgical procedures often require precise cutting and / or removal of various body tissues.

[0003] Currently, vitrectomy devices are made of a non-moving outer tube with openings on the side and an inner tube that acts as a cutting vitreous with up and down motion of the cutting knife (vertical cut knife). The inner tube motion is usually a spring return system driven pneumatically and with this technology a maximum cutting speed of about 10,000 cuts per minute can be achieved. Recently, a dual cutting port has been invented, effectively doubling the cutting speed and maintaining a 100% open duty cycle (opening of the cut knife port), thus increasing the flow capacity and reducing the particle size of the vitreous material. However, this is not enough to perform traction-free vitrectomy.

[0004] WO2018011699 discloses systems, instruments, and methods for an ophthalmic surgical system. The ophthalmic surgical system can include a vitrectomy probe having a housing sized and shaped to be grasped by a user. The vitrectomy probe can also include a cutting knife extending from the housing and sized to penetrate and treat a patient's eye. The cutting knife can include an outer cutting tube coupled to the housing. The outer cutting tube can have an outer port formed therein sized and shaped to receive tissue. The cutting knife can include a rotatable inner cutting member disposed within the outer cutting tube. The inner cutting member can include a first cutting surface that rotates across the outer port to cut tissue as the inner cutting member rotates. The vitrectomy probe can include a pneumatic vane actuator positioned within the housing and configured to rotate the inner cutting member.

[0005] The disadvantage of this invention is that the device is only used for cutting or aspiration, excluding multifunctional use.

[0006] WO2018178804 discloses a vitrectomy probe and methods related thereto are disclosed therein. The disclosure describes various example vitrectomy probes having a rotating helical cutting knife. The example helical cutting knives include an outer cutter portion and an inner cutter portion received within the outer cutter portion. The inner cutter portion is operable to reciprocate rotationally about a longitudinal axis thereof within the outer cutter portion. A helical shear surface formed at a distal end of the inner cutter portion is operable to cut through material entering the cutting knife via a port formed in the outer cutter portion.

[0007] The disadvantage of this invention is that the device is only used for cutting or aspiration, excluding multifunctional use.

[0008] In summary, there is a need for a versatile device that can shorten the time of vitrectomy surgery. SUMMARY

[0009] The present invention provides a vitrectomy device comprising a housing and a cutter, wherein the cutter comprises an outer tube coupled to the housing, an inner tube disposed within the outer tube, the inner tube being rotatable about its longitudinal axis, a drive system positioned within the housing coupled to the inner tube and configured to rotate the inner tube, the inner tube comprising at least one opening at a wall of the inner tube at a distal end of the inner tube, the at least one opening having at least one cutting edge, the outer tube comprising an opening at a wall of the outer tube at a distal end of the outer tube, the opening having a cutting edge, characterized in that the inner tube comprises a plurality of openings at a wall of the inner tube at a distal end of the inner tube, the plurality of openings having a plurality of cutting edges, the cutting edges of the inner tube and the cutting edge of the outer tube being configured to form an angle relative to each other by rotation of the inner tube.

[0010] In one embodiment, the inner tube has a plurality of cutting edges spaced apart from each other, the plurality of cutting edges configured to create a variable open surface opening during rotation in an overlapping manner between the opening of the outer tube and the plurality of openings of the inner tube.

[0011] In another embodiment, the inner tube is configured to create contact between the cutting edge of the outer tube and the cutting edges of the inner tube at any time during rotation of the inner tube.

[0012] In a next embodiment, the variable open surface of the opening is between 50%-150% of the outer tube diameter.

[0013] In another embodiment, the drive system of the cutter of the vitrectomy device comprises a motor, a drive shaft and a revolver.

[0014] In some embodiments, the inner tube is removable.

[0015] In another embodiment, the revolver of the drive system of the cutter comprises a plurality of chambers, wherein at least one of the chambers holds the inner tube.

[0016] In another embodiment, the revolver of the drive system of the cutter can further comprise a vitrectomy tool selected from the group consisting of a slotted needle, a soft-tipped needle / retinal dye / intraocular medication.

[0017] In yet another embodiment, the motor is selected from the group consisting of a high speed rotating air driven sterilizable air motor with at least 80,000 rpm or an electric motor with high speed rotation of at least 80,000 rpm.

[0018] In a next embodiment, the outer tube is open at the distal end.

[0019] In another embodiment, at least one cut edge of the opening of the inner tube is vertical.

[0020] In the following embodiments, at least one cut edge of the opening of the inner tube is inclined.

[0021] The opening of the outer tube is not limited to a specific shape. In another embodiment, the opening of the outer tube is substantially (semi)circular. In a particular embodiment, the cut edge of the opening of the outer tube is substantially (semi)circular.

[0022] In yet another embodiment, the inner tube is configured as an aspiration channel for aspirating tissue from the eye.

[0023] In a next embodiment, the present invention provides a method of vitrectomy using a vitrectomy device according to any one of the preceding claims, comprising the following steps:

[0024] - Insert the vitrectomy device into the vitreous cavity of the eye;

[0025] -Activate the drive system of the vitrectomy device's blade to rotate the inner tube of the vitrectomy device's blade;

[0026] - Cut the glass material with a cutter.

[0027] -Removal of vitreous material from the vitreous cavity via suction;

[0028] Its features are,

[0029] - Cutting is achieved by the angle formed between the cutting edge of the inner tube and the cutting edge of the outer tube.

[0030] In one embodiment, the inner tube has a plurality of spaced-apart cut edges, thereby creating a variable suction space during rotation, i.e., creating a variable open surface opening, by overlapping the opening of the outer tube with at least one opening of the inner tube. Attached Figure Description

[0031] Figure 1 It is a side view that schematically represents the cutting direction of the vitreous material.

[0032] Figure 2 This is a side view of a vitrectomy apparatus according to an embodiment of the present invention.

[0033] Figure 3A This is a side view of the outer tube of a vitrectomy apparatus according to an embodiment of the present invention.

[0034] Figure 3Bis a side view of an inner tube of a vitrectomy device according to an embodiment of the present application.

[0035] Figure 4 is a side view of a vitrectomy device according to an embodiment of the present application.

[0036] Figure 5 is a side view of a vitrectomy device according to an embodiment of the present application.

[0037] Figure 6 shows a detailed side view of a distal end of a cutter according to an embodiment of the present application. DETAILED DESCRIPTION

[0038] The present application will be described with respect to particular embodiments and with reference to certain drawings but the application is not limited thereto. These drawings are merely for illustrative purposes according to present principles and are not intended to limit the scope of the application. In the drawings, the dimensions and relative dimensions of some of the elements can have been exaggerated for the sake of explanation and illustration. The dimensions and relative dimensions of some of the elements in the figures are chosen for the purpose of explanation and are not to be taken as limiting the practical scope of the application.

[0039] Furthermore, the terms "first", "second", "another", and the like, where used in the specification and claims, are used for distinguishing between like elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than described or illustrated herein.

[0040] It is to be noticed that the term "comprising", used in the claims, should not be interpreted as being restricted to the means listed thereafter; it does not exclude other elements or steps. It is thus to be interpreted as specifying the presence of the stated features, integers, steps or components as referred to, but does not preclude the presence or addition of one or more other features, integers, steps or components, or groups thereof. Thus, the scope of the expression "a product including A and B" should not be limited to products that consist only of components A and B. It means that with respect to the present application, the relevant components of the product are A and B and further that the product can also include other components such as C.

[0041] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0042] Similarly, it is to be understood that the various features of the application described in the description of exemplary embodiments of the application are to be considered individually and in combination with each other. For purposes of the US, the phrase "and / or" means and. For purposes of the US, the term "including" and its derivatives refer to claims of the specification and to the specification. For purposes of the US, the term "couple" or "coupled" means to be directly or indirectly connected so that contact is made between them, and includes mechanical and / or electrical and / or hydraulic and / or optical coupling. For purposes of the US, the term "icant" means capable of being.

[0043] Furthermore, while some embodiments described herein include some, but not other, features included in other embodiments, combinations of features of different embodiments are within the scope of the application and form different embodiments, as will be understood by those skilled in the art. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0044] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

[0045] As used herein and unless otherwise stated, the term "distal end" is understood to be the end of the device located distally along the longitudinal axis of the device from the center of the device. The term "distal" can be understood in the art to mean the side of the instrument away from the surgeon and towards the patient.

[0046] As used herein and unless otherwise stated, the term "revolve" is understood to be the motion of something about its longitudinal axis.

[0047] As used herein and unless otherwise stated, the term "removable" is understood to be something that can be easily moved from its place or position.

[0048] As used herein and unless otherwise stated, the term "drive system" is understood to be the system that drives the internal components of the vitreous cutting device (e.g. rotates the revolving cartridge and / or inner tube).

[0049] An advantage of embodiments of the application is that different types of vitreous cutting instruments can be used in one vitreous cutting device to perform not only cutting, but also other vitreous cutting procedures, which increases the speed of the vitreous cutting surgery.

[0050] Yet another advantage of embodiments of the present invention is that due to the respective configuration and position of the cutting edges of the inner tube and the outer tube, the cutting edges are constantly active.

[0051] One advantage of embodiments of the present invention is also that due to the fast and constant cutting, the size of the cut vitreous particles is reduced and the vitreous loses the properties of a non-Newtonian fluid, which also significantly increases the aspiration rate.

[0052] Yet another advantage of embodiments of the present invention is that due to the respective configuration and position of the cutting edges of the inner tube and the outer tube, the vitreous cutting device has a continuously open aspiration port.

[0053] We now refer to Figure 1 , Figure 1 a side view showing a schematic representation of the direction of the cut 115 of the vitreous material, which is schematically represented in the form of fibers 116. This figure clearly shows that when using a vertical cutting knife with horizontal cutting edges, the vitreous material is not cut along the fibers 116 and when using a rotating cutting knife with vertical cutting edges, the cut 115 does not cut across the fibers 116, but extends at an angle to the surface of the fibers 116 at several places (positions).

[0054] We now refer to Figure 2 , Figure 2 a side view showing a vitreous cutting device 100 according to one embodiment of the present invention. This figure clearly shows that the vitreous cutting device 100 comprises an outer tube 103 and an inner tube 106 (also indicated by dashed lines), which have openings at their walls. In this example, the outer tube 103 has an opening 104 at its distal end. Preferably, the outer tube 103 has an opening 104 at its wall and is closed at its end. Alternatively, the outer tube 103 can be open at its end. Preferably, the shape of the opening 104 is at least substantially semicircular and the cutting edge 105 of the outer tube 103 is also at least substantially semicircular. Alternatively, the opening 104 can be substantially circular. Alternatively, the cutting edge 105 can also be substantially circular. Unless specified otherwise, the term "semicircular" is to be understood as an object or arrangement in the form of a semicircle. For example, when a circle is cut in half, or when the circumference of a circle is divided by 2, we obtain a semicircular shape. As used herein, the term "(semi)circular" means both a semicircular arrangement and a circular arrangement. Substantially semicircular and substantially circular indicate that the shape is not limited to a semicircle or a circle, but includes any overall circular-semicircular shape, such as (semi)elliptical, (semi)oval and (semi)elliptical, etc.

[0055] The inner tube 106 comprises at the wall of the inner tube 106 at its distal end a plurality of openings 107 with a plurality of cutting edges 108. Preferably, the inner tube 106 is closed at the distal end. Preferably, the cutting edges 108 of the openings 107 of the rotating inner tube 106 are inclined relative to the longitudinal axis LA of said inner tube.

[0056] Figure 3A A separate side view of the outer tube 103 of a vitrectomy device 100 with semi-circular cutting edges 105 according to one embodiment of the present application is shown.

[0057] Figure 3B A separate side view of the inner tube 103 of a vitrectomy device 100 according to one embodiment of the present application is shown. This figure clearly shows that the inner tube comprises at the wall of the inner tube 106 a plurality of openings 107 with a plurality of cutting edges 108.

[0058] We now refer to Figure 4 , Figure 4 A side view of a vitrectomy device 100 according to one embodiment of the present application is shown. This figure clearly shows that the vitrectomy device 100 comprises an outer tube 103 and an inner tube 106 (also indicated by dashed lines) with openings at their walls. In this example, the outer tube 103 has an opening 104 at its distal end. The opening 104 is semi-circular and the cutting edges 105 of the outer tube 103 are also semi-circular. The inner tube comprises at the wall of the inner tube 106 at its distal end a plurality of openings 107 with a plurality of cutting edges 108. The openings 107 between the cutting edges 108 can have different widths. The theoretical advantage of this embodiment is that by aligning the largest opening 107 of the inner tube 106 with the opening 104 in the outer tube 103, a greater flow rate can be achieved by applying suction only without cutting. Preferably, the inner tube 106 is closed at the distal end. Preferably, the cutting edges 108 of the openings 107 of the rotating inner tube 106 are inclined relative to the longitudinal axis (LA) of said inner tube.

[0059] We now refer to Figure 5 , Figure 5A side view of a vitrectomy device 100 according to one embodiment of the present application is shown. This figure clearly shows that the vitrectomy device 100 comprises a housing 101 sized and shaped for being grasped by a user's hand and a cutter 102 configured for being inserted into a patient's eye. The cutter 102 extends along a longitudinal axis (LA) from a distal end portion 114 of the housing 101. The cutter 102 comprises an outer tube 103 coupled to and extending from the housing 101. The outer tube 103 has an opening 104 in the wall at the distal end. In this example, the outer tube 103 is completely open at the distal end. Preferably, the outer tube 103 is closed at the distal end. The cutter 102 further comprises an inner tube 106 disposed within the outer tube 103, the inner tube 106 being rotatable about its longitudinal axis, which in this embodiment is coaxial with the longitudinal axis LA. The inner tube 106 and the outer tube 103 fit closely together. The inner tube 106 comprises at least one opening 107 in the wall of the inner tube 106 at the distal end of the inner tube 106, the at least one opening 107 having at least one cutting edge 108. In this example, the inner tube 106 comprises a plurality of openings 107 in the wall of the inner tube 106 at the distal end of the inner tube 106, the plurality of openings 107 having a plurality of cutting edges 108. Preferably, the plurality of cutting edges 108 of the inner tube 106 are spaced apart from each other. Preferably, the inner tube 106 is configured to create a variable open surface of the opening 104 during rotation in a manner that the opening 104 overlaps between the opening 104 of the outer tube 103 and the plurality of openings 107 of the inner tube 106. Preferably, the at least one cutting edge 108 of the opening 107 of the rotating inner tube 106 can be vertical, i.e. parallel to or inclined with respect to the longitudinal axis of the inner tube. Alternatively, all cutting edges 108 of the plurality of openings 107 of the rotating inner tube 106 can be parallel to each other, parallel to or inclined with respect to the longitudinal axis of the inner tube. Alternatively, the at least one cutting edge 108 of the opening 107 of the rotating inner tube 106 can be slightly curved, i.e. smoothly rounded with respect to the longitudinal axis of the inner tube. Alternatively, all cutting edges 108 of the plurality of openings 107 of the rotating inner tube 106 can be slightly curved, i.e. smoothly rounded with respect to the longitudinal axis of the inner tube, in particular in an orientation parallel to each other. Said vertical and / or slightly curved orientation of the cutting edges 108 of the opening 107 of the rotating inner tube 106 improves the cutting motion. In this example, the plurality of cutting edges 108 of the opening 107 of the inner tube 106 are inclined with respect to the longitudinal axis of the inner tube. The outer tube 103 comprises the opening 104 in the wall of the outer tube 103 at the distal end of the outer tube 103, the opening 104 having a cutting edge 105. In this example, the opening 104 of the outer tube 103 is semicircular; in particular the cutting edge 105 of the outer tube 103 is semicircular. Alternatively, the opening 104 can be substantially circular.Alternatively, the cutting edge 105 may also be substantially circular. The inner tube 106 of the cutter 102 is in an extreme position, characterized in that the distal end of the inner tube 106 does not extend beyond the distal end of the outer tube 103, and thus the cutting edge 108 of the inner tube 106 and the cutting edge 105 of the outer tube 103 form an angle α relative to each other by the rotation of the inner tube 106. Figure 6 (As shown in the diagram). Preferably, the inner tube 106 is configured to make contact between the cutting edge 105 of the outer tube 103 and at least one of the cutting edges 108 of the inner tube 106 at any time during the rotation of the inner tube 106, i.e., forming an angle α. In other words, the plurality of openings 107 having a plurality of cutting edges 108 in the wall of the inner tube 106 are preferably configured to make contact between the cutting edge 105 of the outer tube 103 and at least one of the cutting edges 108 of the inner tube 106 at any rotational position of the inner tube relative to the outer tube. This configuration provides cutting conditions at any rotational position, enabling continuous cutting at any time during the rotation of the inner tube 106. It will be apparent to those skilled in the art that the distance between the openings 107 in the inner tube 106 and / or the orientation of the cutting edges 108 can allow such continuous cutting at any time during the rotation of the inner tube 106. Preferably, the openings 107 are arranged such that at least two cutting edges 108 of the inner tube 106 form an angle α relative to the cutting edge 105 of the outer tube 103. Therefore, continuous cutting is achieved through two cuts during each rotation of the inner tube 106. Preferably, the angle α is variable, and because the cut follows the shape of the opening 104, it is between 90° at the start of the cut when the cutting edge 108 of the inner tube 106 first contacts the cutting edge 105 of the outer tube 103 and 180° at the end of the cut when the cutting edge 108 of the inner tube 106 touches the last point of the cutting edge 105 of the outer tube 103.

[0060] In one particular embodiment, the cut edges 108 of a plurality of openings 107 of the rotating inner tube 106 are parallel to each other in an inclined or slightly curved orientation, and the cut edge 105 of the outer tube 103 is substantially (semi)circular, wherein the openings 107 are arranged such that at least two cut edges 108 of the inner tube 106 form an angle α with respect to the cut edge 105 of the outer tube 103. It has been observed that this configuration provides optimal results in cutting and rapidly aspirating glass fiber material when the glass fiber material is drawn into the suction channel of the inner tube 106.

[0061] Preferably, the inner tube 106 is removable. The vitrectomy device 100 further comprises a drive system 109 positioned within the housing 101, which is coupled to the inner tube 106 and configured to rotate the inner tube 106. Preferably, the drive system 109 of the cutter 102 comprises a motor 110, a drive shaft 111 and a revolver 112. Preferably, the revolver 112 of the drive system 109 of the cutter 102 comprises a plurality of chambers 113 positioned symmetrically about the longitudinal axis of the revolver. In this example, the revolver 112 comprises four chambers 113, wherein one of said chambers 113 holds the inner tube 106. The revolver 112 can further comprise a vitreoretinal instrument, for example selected from a slotted needle, a soft-tipped needle / retinal dye / intraocular medication, etc. The inner tube 106 can be replaced with such a vitreoretinal instrument in the outer tube 103 to perform other surgical procedures. The motor 110 of the drive system 109 is for example selected from a sterilizable air motor with high speed rotation of at least 80,000 rpm or an electric motor with high speed rotation of at least 80,0000 rpm. The plurality of cutting edges 108 of the inner tube 106, spaced apart from each other, overlap between the opening 104 of the outer tube 103 and the opening 107 of the inner tube 106 in a manner that creates a variable suction space during rotation. This configuration of the respective positions of the cutting edges of the inner and outer tubes allows the vitrectomy device 100 to have a continuous open suction port. The variable open surface of the opening 104 is between 50%-150% of the diameter of the outer tube 103. Internally, the inner tube 106 is a suction channel arranged to suction tissue from the eye.

[0062] We now refer to Figure 6 , Figure 6 A detailed side view of the distal end of the cutter 102 is shown, according to one embodiment of the present application. This figure clearly shows that the inner tube 106 comprises a plurality of openings 107 at the wall of the inner tube 106 at its distal end, having a plurality of cutting edges 108, and that the plurality of cutting edges 108 of the opening 107 of the rotating inner tube 106 are inclined relative to the longitudinal axis of the inner tube. The cutting edges 108 of the inner tube 106 and the cutting edges 105 of the outer tube 103 form an angle a relative to each other by rotation of the inner tube 106.

[0063] The method of vitrectomy using the vitrectomy device 100 is performed as follows.

[0064] The vitrectomy device 100 is inserted into the vitreous chamber of the eye. The drive system of the cutter 102 of the vitrectomy device 100 is activated to rotate the inner tube 106 of the cutter 102 of the vitrectomy device. The vitreous material is cut by the cutter 102 and then removed from the vitreous chamber by suction. The cutting is achieved by the angle a formed between the cutting edge 108 of the inner tube 106 and the cutting edge 105 of the outer tube 103.

[0065] Feature List

[0066]

[0067]

Claims

1. A vitrectomy device (100) comprising: - a housing (101), - a cutter (102), wherein the cutter (102) comprises: - an outer tube (103) coupled to the housing (101), the outer tube (103) having an opening (104) on a wall at a distal end; - an inner tube (106) disposed within the outer tube (103), the inner tube (106) rotatable about its longitudinal axis; - a drive system (109) positioned within the housing (101) and configured to rotate the inner tube (106); - the outer tube (103) comprising the opening (104) with a cutting edge (105) at the wall of the outer tube (103) at the distal end of the outer tube (103); characterized in that: - the inner tube (106) comprises a plurality of openings (107) at the wall of the inner tube (106) at the distal end of the inner tube (106), the plurality of openings of the inner tube having a plurality of cutting edges (108); - the cutting edges (108) of the inner tube (106) and the cutting edge (105) of the outer tube (103) are configured to form an angle (a) relative to each other by rotation of the inner tube (106); - the inner tube (106) is closed at a distal end; and - the outer tube (103) is completely open at a distal end.

2. The vitrectomy device (100) according to claim 1, wherein The inner tube (106) comprises a plurality of openings (107) with a plurality of cutting edges (108) spaced apart from each other, the inner tube being configured to create a variable open surface of the opening (104) of the outer tube (103) during rotation in an overlapping manner between the opening (104) of the outer tube (103) and the plurality of openings (107) of the inner tube (106).

3. The vitrectomy device (100) according to claim 2, wherein The inner tube (106) is configured to create contact between the cutting edge (105) of the outer tube (103) and at least one of the cutting edges (108) of the inner tube (106) at any time during rotation of the inner tube (106).

4. The vitreous cutting device (100) according to claim 2, wherein The variable open surface of the opening (104) of the outer tube (103) is between 50-150% of the diameter of the outer tube (103).

5. The vitrectomy device (100) according to claim 1, wherein The drive system (109) of the cutter (102) comprises a motor (110), a drive shaft (111), and a revolver (112).

6. The vitrectomy device (100) according to claim 1, wherein The inner tube (106) is removable.

7. The vitrectomy device (100) according to claim 5, wherein The revolver (112) of the drive system (109) of the cutter (102) comprises a plurality of chambers (113), wherein at least one of the chambers (113) holds the inner tube (106).

8. The vitrectomy device (100) according to claim 7, wherein The revolver (112) can further comprise vitrectomy tools selected from the group consisting of a slotted needle, a soft-tipped needle / retinal dye / intraocular medication.

9. The vitreous cutting device (100) according to claim 5, wherein The motor (110) is selected from a sterilizable air motor with high speed rotation of at least 80,000 rpm or an electric motor with high speed rotation of at least 80,000 rpm.

10. The vitrectomy device (100) according to claim 1, wherein At least one cutting edge (108) of the opening (107) of the inner tube (106) in rotation is vertical.

11. The vitrectomy device (100) according to claim 1, wherein At least one cutting edge (108) of the opening (107) of the inner tube (106) in rotation is inclined.

12. The vitrectomy device (100) according to claim 1, wherein The opening (104) of the outer tube (103) is semi-circular or circular.

13. The vitrectomy device (100) according to claim 1, wherein The cutting edge (105) of the outer tube (103) is semi-circular or circular.

14. The vitreous cutting device (100) according to claim 1, wherein, The inner tube (106) is a suction channel arranged to suction tissue from the eye.

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