Vitreous surgery probe

Abstract

To facilitate an approach of an opening part of a probe body to a retina.SOLUTION: A vitreous surgery probe 100 comprises: a probe body 110 to penetrate an eyeball, including a cylindrical part 111 where an opening 111a is formed close to a distal end part and a distal end wall part 112 for sealing the distal end part of the cylindrical part 111; and a cutter blade 120 to be slid on an inner surface of the probe body 110. In the distal end wall part 112, a portion on the opposite side of the opening 111a is inclined toward a proximal side, and an outer edge part (a) of at least the distal end wall part is positioned on the proximal side in a second cross-sectional shape of a second plane which includes a center axis of the cylindrical part 111 and is vertical to a first plane extending to the opposite side from a side of the opening 111a.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a vitreous surgical probe for use in ophthalmic surgery. [Background technology]

[0002] Vitreous surgery probes used in ophthalmic surgery are used to pull in the gelatinous vitreous body in the eyeball and the proliferative membrane on the retina that has formed due to denaturation of the vitreous body (referred to as "vitreous body, etc.") through the opening of the probe body and cut and remove (excise). When the vitreous body, etc. is close to the retina or floating near the retina, it is desirable to bring the probe body close to the retina.

[0003] In view of this, the present applicant has proposed a probe having an inclined tip that makes it easier to bring the probe body closer to the retina (Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-42703 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-mentioned vitreous surgery probe, the easier it is to bring the opening of the probe body closer to the retina, the easier it is to cut off the vitreous body near the retina.

[0006] The present disclosure has been made in consideration of the above points, and aims to make it easier to bring the opening of the probe body closer to the retina. [Means for solving the problem]

[0007] In order to achieve the above object, the disclosed technology includes: a probe body that penetrates the eyeball and has a cylindrical portion with an opening formed near a tip portion and a tip wall portion that seals the tip portion of the cylindrical portion; a vitreous surgery probe having an outer diameter that fits the inner diameter of the probe body, a cutting blade having a blade portion at a tip thereof, and a cutter blade that slides on the inner surface of the probe body, The tip wall portion is In a first cross-sectional shape on a first plane including a central axis of the tubular portion and extending from the opening side to an opposite side, a portion on a tangent line at an intersection with the central axis opposite to the opening is inclined toward a proximal side, a portion of the first cross-sectional shape opposite to the opening with respect to an intersection with the central axis is located on the tangent line or proximal to the tangent line; In a second cross-sectional shape on a second plane that includes the central axis of the tubular portion and is perpendicular to the first plane, at least an outer edge portion of the tip wall portion is located proximal to the intersection with the central axis.

[0008] This allows the distance from the retina to the opening to be set relatively short by tilting the probe body so that the tip wall portion is close to and along the retina, etc. Furthermore, by rotating the probe body around the central axis of the cylindrical portion, the distance from the retina to the opening can be further shortened. Effect of the Invention

[0009] According to the present disclosure, it is possible to easily bring the opening of the probe body closer to the retina. [Brief description of the drawings]

[0010] [Figure 1] An explanatory diagram showing the vitreous surgery probe in use [Diagram 2] A front view showing the state where the tip of the probe body is brought close to the retina. [Diagram 3] A side view showing the tip of the probe body approaching the retina. [Figure 4] FIG. 2 is a perspective view showing the structure of the tip of the probe body; [Diagram 5] A cross-sectional view of the tip of the probe body taken along a first plane P1. [Figure 6] A cross-sectional view of the tip of the probe body taken along a second plane P2. [Figure 7] A side view showing the probe body opening closer to the retina. [Figure 8] 11 is a cross-sectional view of the tip of the probe body of the second embodiment taken along a second plane P2. [Figure 9] 11 is a cross-sectional view of the tip of the probe body of the third embodiment taken along a second plane P2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each of the following embodiments and modifications, components having the same functions as those in other embodiments will be given the same reference numerals and will not be described. Furthermore, the components of each embodiment may be combined in various ways as far as logically possible.

[0012] (Embodiment 1) As shown in Fig. 1, a vitreous surgery probe 100 is connected to a vitreous cutter 200, and penetrates an eyeball 300 to cut, remove (excise) and collect the vitreous body and the like near a retina 301. The vitreous surgery probe 100 includes a probe body 110 and a cutter blade 120, as shown in Figs. 2 and 3.

[0013] The probe body 110 is configured such that the tip of a cylindrical (tubular, pipe-shaped) tubular portion 111 is sealed by a tip wall portion 112. This probe body 110 can be said to be an outer cylinder that covers a cutter blade 120.

[0014] A circular opening 111a, for example, is formed near the tip of the cylindrical portion 111 of the probe main body 110. This opening 111a is a hole (hole) for drawing intraocular tissue such as the vitreous body into the probe main body 110 by suction from the base end side of the probe main body 110 and cutting and collecting the tissue by sliding of the cutter blade 120. The cut tissue pieces such as the vitreous body are sucked to the base end side of the probe main body 110 and collected, for example.

[0015] As shown in the side shape of FIG. 3, the tip wall 112 of the probe body 110 is inclined so that the edge located on the opening 111a side of the tubular portion 111 forms the starting point of the apex L, and the edge located opposite the opening 111a forms the end point of the apex L, with the starting edge of the apex L protruding distally beyond the end edge (first inclination), and the surface of the tip wall 112 has a convex shape with the apex L as the ridgeline, with both sides maintaining a bulge and gradually inclining more toward the proximal side (shape having a second inclination).

[0016] More specifically, as shown in Figures 4 to 6, the tip wall 112 includes the central axis C of the tubular portion 111 and has a first cross-sectional shape A (Figure 5) on a first plane P1 (Figure 4) extending from the opening 111a side to the opposite side. In this embodiment, the tangent N (which coincides with the apex L because the apex L is a straight line) at the intersection M with the central axis C is inclined toward the proximal side of the probe body 110, and the portion of the tip wall 112 opposite the opening 111a from the intersection M with the central axis C in the first cross-sectional shape A is located on the tangent N (note that it may be formed in a curved shape so as to be located on the proximal side of the tangent N). Furthermore, in a second cross-sectional shape B (FIG. 6) on a second plane P2 (FIG. 4) that includes the central axis C of the tubular portion 111 and is perpendicular to the first plane P1, at least the outer edge portion a of the tip wall portion 112 (the outer edge portion of the tip wall portion 112 located at 90 degrees and 270 degrees when the rotational phases of the starting point and ending point of the apex L when projected onto a plane perpendicular to the central axis C are 0 degree and 180 degree directions) is formed by a curved portion 112a that has a curved convex shape over its entire length so as to be located closer to the proximal side of the probe body 110 than the intersection portion M with the central axis C.

[0017] 6, in the second cross-sectional shape B of the tip wall 112 on the second plane P2 (FIG. 4), each region of the curved portion 112a on both sides of the apex L is located closer to the proximal side of the probe body 110 than the apex L. The same is true for the cross-sectional shape of the tip wall 112 on another plane parallel to the second plane P2.

[0018] The method of forming the tip wall portion 112 as described above is not particularly limited, and the shape of the tip wall portion 112 may be formed, for example, by welding the tip wall portion 112 to the tubular portion 111 or by narrowing the tip portion of the tubular portion 111.

[0019] The cutter blade 120 is for cutting vitreous body and the like. The cutter blade 120 has a cylindrical (tubular, pipe-like) appearance like the tubular part 111 of the probe body 110, and is provided with a blade part 121 at its tip. The cutter blade 120 can be said to be an inner cylinder contained in the outer cylinder of the probe body 110. The cutter blade 120 is provided so as to be slidable along the axial direction of the probe body 110 while contacting the inner surface of the probe body 110. Therefore, the cutter blade 120 is formed with an outer diameter that fits the inner diameter of the probe body 110. As a result, when the cutter blade 120 slides (forward and backward) on the inner surface of the probe body 110 and the blade part 121 at the tip of the cutter blade 120 passes through the opening 111a (the other blade part) of the probe body 110, the vitreous body and the like near the opening 111a are cut into small pieces.

[0020] In the vitreous surgery probe 100 configured as described above, as shown in FIG. 5, the portion of the tip wall 112 of the probe body 110 on the opening 111a side is inclined toward the tip (first inclination), and by inclining the probe body 110 so that the tip wall 112 is close to and aligned with the retina 301 as shown in FIG. 3, the distance from the retina 301 to the closest position on the periphery of the opening 111a can be set to a relatively short distance, for example 0.18 mm.

[0021] Furthermore, in the vitreous surgery probe 100 of this embodiment, the surface of the tip wall 112 is formed in a convex shape with the apex L as a ridgeline, so that both sides of the apex L are gradually inclined toward the proximal side while maintaining a bulge (a shape having a second incline) as shown in Fig. 6. As a result, by rotating the probe body 110 from the state shown in Fig. 3 around the central axis C to the state shown in Fig. 7, the distance from the retina 301 to the peripheral part of the opening 111a can be further shortened to, for example, 0.16 mm.

[0022] More specifically, when the probe main body 110 tilted with respect to the retina 301 is rotated around the central axis C as shown in Fig. 3, the amount of movement of each part of the tip wall 112 in the direction approaching the retina 301 is largest at the outer edge part a of the tip wall 112 in the second cross-sectional shape B (Fig. 6) (the outer edge part of the tip wall 112 located at 90 degrees and 270 degrees when the rotation phases of the start point and the end point of the apex L in the projection onto a plane perpendicular to the central axis C are 0 degrees and 180 degrees). However, as described above, at least the outer edge part a is located on the proximal side of the probe main body 110 relative to the position of the intersection part M between the tip wall 112 and the central axis C in the central axis C direction, so that the probe main body 110 can be rotated around the central axis C without contacting the retina 301 and without moving the probe main body 110 in the direction along the central axis C. This makes it easier to bring the opening 111a closer to the retina 301 as shown in Fig. 7, and makes it easier to cut off the vitreous body near the retina 301. That is, by forming the inclined surface formed at the tip of the probe body to have both the first inclination and the second inclination, the opening 111a, which serves as an inlet for the vitreous body, etc., can be brought closer to the retina, and the opening 111a can be brought closer to the vitreous body, etc. to be collected as much as possible, and the amount of vitreous body, etc. left behind can be reduced. In the above example, for convenience of explanation, the probe body 110 in the state shown in Fig. 3 is rotated around the central axis C to reach the state shown in Fig. 7, but the operation is not limited to two steps as described above, and it is also possible to bring the probe body 110 into the state shown in Fig. 7 when it is inserted into the eyeball 300.

[0023] Here, the significance of bringing opening 111a closer to retina 301 is not limited to shortening the distance from retina 301 to the closest point on the periphery of opening 111a, but if the opening portion that is effective for removing, suctioning, etc., of the vitreous body is substantially brought closer to retina 301, then removal of the vitreous body near retina 301, etc., can be easily performed.

[0024] The shapes of the opening 111a and the tip wall portion 112 can be formed, for example, symmetrically with respect to a plane of symmetry including the central axis C of the tubular portion 111 so that the distance between the opening 111a and the retina 301 is short regardless of the tilt direction or rotation direction of the vitreous surgery probe 100, but this is not limited to the above and the opening 111a and the tip wall portion 112 may be formed in an asymmetrical shape.

[0025] Here, in Figures 2 to 5, for convenience, the probe body 110 is depicted as being approximately in contact with the retina 301. However, in actual use, it is recommended that the probe body 110 not be in contact with the retina 301 but be slightly raised above it so as not to damage the retina 301. Even in this case, the effect of shortening the distance to the peripheral portion of the opening 111a as described above is basically the same.

[0026] (Embodiment 2) The shape of the outer edge portion a in the second cross-sectional shape B of the tip wall portion 112, which is located proximal to the probe body 110 relative to the position in the central axis C direction of the intersection point M between the tip wall portion 112 and the central axis C, is not limited to being formed by a curved portion 112a which is a curved convex shape as shown in FIG. 6, but may be such that the first cross-sectional shape A in the first plane P1 (FIG. 4) is linear as in FIG. 5, and in the second cross-sectional shape B in the second plane P2 (FIG. 4), the linear portion L' is a ridge line as shown in FIG. 8, and is formed by a pair of inclined plane portions 112b inclined proximally on both sides of the ridge line.

[0027] 8, in the second cross-sectional shape B of the tip wall 112 on the second plane P2 (FIG. 4), each region of the inclined flat surface portion 112b on both sides of the linear portion L' is located closer to the proximal side of the probe body 110 than the linear portion L'. The same is true for the cross-sectional shape of the tip wall 112 on another plane parallel to the second plane P2.

[0028] (Embodiment 3) Furthermore, the second cross-sectional shape B of the tip wall 112 may have a shape in which the outer edge portion a is located proximal to the probe body 110 relative to the position in the central axis C direction of the intersection M between the tip wall 112 and the central axis C, such that the first cross-sectional shape A is linear as in FIG. 5 and is formed by a central plane portion 112c including the linear portion L' and having a pair of edges on both sides of the linear portion L', and a pair of inclined plane portions 112d connected to the pair of edges of the central plane portion 112c and inclined proximally toward both sides of the central plane portion 112c, as shown in FIG. [Explanation of symbols]

[0029] 100 Vitreous surgery probe 110 Probe body 111 Cylindrical part 111a aperture 112 Tip wall 112a Curved section 112b Inclined plane section 112c Central plane section 112d Inclined plane section 120 Cutter blade 121 Blade 200 Vitreous Cutter 300 Eyeball 301 Retina P1 First plane P2 Second Plane L Top C center axis A First cross-sectional shape B Second cross-sectional shape M intersection N tangent a Outer edge L' Straight section

Claims

1. a probe body that penetrates the eyeball and has a cylindrical portion with an opening formed near a tip portion and a tip wall portion that seals the tip portion of the cylindrical portion; a vitreous surgery probe having an outer diameter that fits the inner diameter of the probe body, a cutting blade having a blade portion at a tip thereof, and a cutter blade that slides on the inner surface of the probe body, The tip wall portion is In a first cross-sectional shape on a first plane including a central axis of the tubular portion and extending from the opening side to an opposite side, a portion of a tangent line at an intersection with the central axis on the opposite side to the opening is inclined toward a proximal side, a portion of the first cross-sectional shape opposite to the opening from an intersection with the central axis is located on the tangent line or proximal to the tangent line; A vitreous surgery probe, characterized in that in a second cross-sectional shape on a second plane including a central axis of the tubular portion and perpendicular to the first plane, at least an outer edge portion of the tip wall portion is located proximal to the intersection with the central axis.

2. The vitreous surgery probe according to claim 1, The probe for vitreous surgery, wherein the tip wall portion has a second cross-sectional shape formed by a curved portion that is a curved convex shape over its entire length.

3. The vitreous surgery probe according to claim 1, The tip wall portion is The first cross-sectional shape is linear, A vitreous surgery probe, characterized in that the linear portion serves as a ridge line and is formed by a pair of inclined flat portions inclined proximally on both sides of the ridge line.

4. The vitreous surgery probe according to claim 1, The tip wall portion is The first cross-sectional shape is linear, a central plane portion including the linear portion and having a pair of edges on either side of the linear portion; A vitreous surgery probe, characterized in that it is formed by a pair of inclined plane portions connected to a pair of edges of the central plane portion and inclined proximally toward both sides of the central plane portion.

5. The vitreous surgery probe according to claim 1, A vitreous surgery probe, wherein the tip wall portion has a shape symmetrical with respect to the first plane.

Images