Patent Application
20180193191
The present invention relates to an ophthalmic scraper device, in particular an ophthalmic scraper device for ophthalmic surgical assistance. In a further aspect the invention relates to method of making an ophthalmic scraper.
International publication WO 01/19255 discloses an adjustable stiffness membrane scraper usable in ophthalmic applications. A scraping edge projecting beyond a tip of the instrument is provided with abrasive particles.
US patent publication U.S. Pat. No. 5,921,998 discloses an ophthalmic treatment tool having a grip portion, a rod-shaped body attached to the grip portion and an elastic body fitted toward a front end side of the rod-shaped body, wherein a tapered tip of the elastic body is provided with hard inorganic fine-grains or particles.
US patent application US 2007/0282348 discloses an ophthalmic microsurgical instrument for scraping or selectively removing tissue membrane from the retina, or other areas of the eye. The ophthalmic microsurgical instrument is provided with a rod like solid silicone tip having a front most portion which is coated with a plurality of micron size sapphire chips providing an abrasive surface. Both the angle and hardness of the silicone tip are determined for providing maximum tactile feel to a surgeon using the ophthalmic microsurgical instrument.
The prior art devices thus comprise randomly deposited particles on a tapered tip of a rod shaped body. During use, these particles may be released or come off the instrument and remain in the eye of a patient.
The present invention seeks to provide an improved ophthalmic scraper device, wherein surface material or foreign material of the scraper device is not released and left behind in a patient's eye during a procedure, e.g. an ophthalmic or intraocular procedure.
According to the present invention an ophthalmic scraper device of the type defined in the preamble is provided comprising a handle body at a first end of the ophthalmic scraper device and a flexible rod shaped body at a second end of the ophthalmic scraper device projecting from the handle body, wherein the rod shaped body comprises a flexible tip portion distal to the handle body, the tip portion having an abrasive patterned surface texture, and wherein the rod shaped body, the flexible tip portion and the abrasive patterned surface texture are made of a single flexible material.
An advantage of the present invention is that the abrasive patterned surface texture is provided as a surface roughness of the single material of the rod shaped body rather than provided by foreign particles bonded, deposited or adhered thereto. As a result the abrasive patterned surface texture of the present invention is a surface roughness feature of the single material of which the rod shaped body is made, thereby avoiding spontaneous release of foreign abrasive particles during use of the scraper device in ophthalmic procedures, such as removing vitreous material from retinal tissue or peeling an internal membrane.
In an embodiment, the tip portion comprises a tapered section provided at least in part with the abrasive patterned surface texture, allowing the tip portion to engage an operation surface at an angle as the ophthalmic scraper device may be manoeuvred at an angle to the operation surface during a procedure.
In an embodiment, the abrasive patterned surface texture is provided on an entire surface of the tip portion. This allows for a maximum scraping surface that maximizes scraping efficiency.
In a further embodiment, the abrasive patterned surface texture is disposed circumferentially around the tip portion along an abrasive length of the rod shaped body, thereby facilitating scraping engagement alongside the flexible rod shaped body when following a curved surface.
In another embodiment, the abrasive patterned surface texture comprises an embossed patterned surface texture, wherein embossed features defining the abrasive patterned surface texture may comprise various ribs, ridges, projections, notches, hairs, polygonal structures and so on. These embossed features may be envisaged as small scale surface deformations of the rod shaped body, in particular the tip portion.
In a more specific embodiment, the abrasive patterned surface texture comprises an alternating pattern of a plurality of parallel grooves and ridges, which is advantageous for increasing scraping action during forward and backward motion of the ophthalmic scraper device.
In an advantageous embodiment, the abrasive patterned surface texture comprises a square or honeycomb pattern of a plurality of recesses, wherein the plurality of recesses are delimited by abrasive walls having relatively sharp edges that provide increased scraping action. The plurality of recesses allow scraped material to be received therein, not only to facilitate removal of scraped material, but also to ensure that the plurality of abrasive walls maintain good scraping contact with a surface to be scraped.
In an even further embodiment, the tip portion is provided with two different surface patterns, e.g. at an upper part and a lower part of the tip portion. This allows a user to have two different scraping actions available during use, by simply turning the ophthalmic scraper device over 180 degrees.
In a further aspect, the present invention seeks to provide an improved method of making an ophthalmic scraper device. According to this further aspect of the invention a method is provided of making an ophthalmic scraper device of the type defined in the preamble, the method comprising providing a rod shaped body of a single, flexible material, forming a surface area of a tip portion of the rod shaped body for providing an abrasive patterned surface texture on the tip portion, and providing a handle body and connecting the handle body to the rod shaped body at an end thereof opposite the tip portion. This allows to produce the present invention embodiments of an ophthalmic scraper device in a cost-efficient and reproducible manner.
The present invention will be discussed in more detail hereinafter based on a number of exemplary embodiments with reference to the drawings, in which
In the embodiments shown in
The tapered section 14 allows the tip portion 10 to engage a surface, e.g. a retina surface, at an angle as the ophthalmic scraper device 1 may be positioned or manoeuvred at an angle to the surface during a procedure.
In an advantageous embodiment the abrasive patterned surface texture 12 is provided on an entire surface of the tip portion 10, so that a maximum scraping surface is obtained that maximizes scraping efficiency. A taper angle α of the tapered section 14 can be chosen to facilitate a particular scraping action of the ophthalmic scraper device 1. The tapered section 14 e.g. has a taper angle α between 25° and 65° degrees with respect to a longitudinal direction or axis of the rod shaped body 6. It may be envisaged that a user utilizes two or more ophthalmic scraping devices 1, each having a different taper angle α to allow for different engagement angles of the rod shaped body 6 with respect to a tissue surface. In a further embodiment the taper angle α may even be more than 65°, even up to 90°, which would mean that the tip section 10 comprises a straight end surface substantially perpendicular to the longitudinal direction or axis of the rod shaped body 6.
In a further embodiment, the abrasive patterned surface texture 12 is disposed circumferentially around the tip portion 10 along an abrasive length l of the rod shaped body 6, thereby allowing scraping engagement alongside the flexible rod shaped body 6 when following a curved surface. Advantageously, increasing the abrasive length l along the rod shaped body 6 increases the surface area that can be scraped in a single movement of the ophthalmic scraper device 1. Typically, the (overall) length Lr of the rod shaped body 6 is between 0.5 mm to 5 mm in most embodiments. The abrasive length l along which the abrasive patterned surface texture 12 can be circumferentially arranged may be any length between zero and the length Lr of the rod shaped body 6, depending on scraping requirements of the application.
The rod shaped body 6 may comprise an outer diameter D between 0.1 mm to 1.5 mm, which, in combination with the single material of the rod shaped body 6, provides sufficient flexibility of the rod shaped body 6 for delicate scraping requirements during e.g. retina procedures.
In a particular embodiment, the abrasive patterned surface texture 12 comprises a regularly patterned surface texture 12. This embodiment is advantageous for manufacturing the rod shaped body 6, where a regularly patterned surface texture 12 facilitates automated manufacturing.
In light of the present invention, scraping action of the rod shaped body 6 is achieved through the abrasive patterned surface texture 12, which can be viewed as an increased surface roughness of the single material of which the rod shaped body 6 is made. In many embodiments the abrasive patterned surface texture has a surface roughness Ra between 1/1000 mm to 5/10 mm. In this application, surface roughness is a measure in the general terms as used in the art, i.e. a one dimensional parameter defined by the arithmetic average of absolute values y (being a vertical deviation perpendicular to the surface):
The surface texture 12 may have various parameters characterising the surface texture 12, including but not limited to the surface roughness Ra. These parameters may be uniform for the entire surface texture 12, or areas may exist within the surface texture 12 with different parameter values. It would also be possible to have a non-uniform surface texture 12, e.g. a gradually increasing or decreasing surface roughness Ra.
The increased surface roughness may be embodied as raised or sunken surface features applied to the single material of the rod shaped body 6. Such raised and sunken surface features of the rod shaped body 6, tip portion 10 and/or tapered section 14 will be referred to “embossments”, thus wherein the abrasive patterned surface texture 12 comprises an embossed abrasive patterned surface texture 12. The embossments may comprise a plurality of ribs, ridges, projections, notches, hairs, various polygonal (e.g. hexagonal) structures and so on. In
As depicted in the embodiment of
In
It is noted that one or more of the various embodiments described with reference to
In alternative embodiments the abrasive patterned surface texture 12 may also comprise other patterns comprising e.g. polygon shaped recesses 26, e.g. triangular, hexagonal recesses, wherein the abrasive walls 28 thereof are positioned at different angles, thereby providing alternative scraping action for particular directions of motion of the rod shaped body 6.
As mentioned earlier, the rod shaped body 6 can be made of a single material having at least in part an abrasive patterned surface texture 12 applied thereto. The single material may be any medical grade material, e.g. silicone rubber or thermoplastic elastomer (TPE). In order to provide a sufficient flexibility of at least the tip portion 10, yet still provide sufficient strength to act as a scraper device, the material is selected to have a certain hardness, e.g. a Shore A value between 0 and 75.
If the rod shaped body 6 is made of a flexible material, it may be advantageous to arrange the rod shaped body 6 slidably within the handle body 2. This is e.g. achieved by providing a capillary tube or sleeve of e.g. polyimide material (which is stiffer than the flexible material of the rod shaped body 6) around the rod shaped body 6. The capillary tube is mounted slidable within a second capillary tube (e.g. from a metal material) which is fixed inside the handle body 2 with an external actuator element (slider handle). The rod shaped body 6 can then be extended using the slider handle.
To further increase scraping capabilities of the rod shaped body 6, alternative embodiments may be provided wherein the single material is a resin, optionally further comprising an additive in the form of particles, e.g. sand, diamond dust etc. This embodiment allows for an additional, higher surface roughness if so required.
In a further aspect the invention relates to a method of making an ophthalmic scraper device. Reference is made to the
According to the present invention the rod shaped body 6 is to be provided at least in part with an increased surface roughness to allow for scraping engagement with a surface, e.g. a retina surface, wherein the surface roughness is to be provided as part of the single material of which the rod shaped body 6 is made. To the end the method comprises the step of providing a rod shaped body 6 of a single, flexible material, e.g. silicon or a thermoplastic material. The method then comprises the step of forming a surface area of a tip portion 10 of the rod shaped body 6 for providing an abrasive patterned surface texture 12 on the tip portion 10. The tip portion 10 may also comprise a circumferential outer surface area along an abrasive length l of the rod shaped body 6 in a longitudinal direction or axis thereof.
As a last step, the method further comprises providing a handle body 2 and connecting the handle body 2 to the rod shaped body 6 at an end thereof opposite the tip portion 10.
The method of the present invention is advantageous in that the abrasive patterned surface texture 12 is part of the material of which the rod shaped body 6 is made and that no foreign abrasive particles are used to form an abrasive surface texture. As a result, the ophthalmic scarper device 1 manufactured according to the present invention does not release particles that could stay in the patient's eye after e.g. a retinal procedure, which further reduces the risk of possible damage to the eye.
In an embodiment the tip portion 10, or the entire rod shaped body 6, is formed using an injection moulding process, wherein the abrasive patterned surface texture 12 is provided through an injection mould inner surface texture. Such an injection moulding process is efficient and capable of high reproducibility in providing surface textures in one single step. In an alternative embodiment, the surface texture 12 is applied as a separate step, e.g. using pressure or compression moulding techniques. In an alternative embodiment the tip portion 10, or the entire rod shaped body 6, is formed using an extrusion process. In such an extrusion process the abrasive patterned surface texture 12 may comprises a plurality of grooves and ridges in longitudinal direction of the rod shaped body 6.
So in further embodiments of the method, forming a surface area of a tip portion 10 of the rod shaped body 6 for providing an abrasive patterned surface texture 12 on the tip portion 10 may comprise an injection moulding process and/or extrusion process, possibly in one single step.
In further advantageous embodiments, forming the abrasive patterned surface texture 12 of the tip portion 10 is obtained by laser treatment. In this way surfaces areas of the rod shaped body 6, in particular the tip portion 10, are subjected to a laser treatment for altering the surface roughness of the single, flexible material of which the rod shaped body 6 is made. The entire rod shaped body 6 may be subjected to such a laser treatment as well in specific embodiments.
In an embodiment, the laser treatment comprises a laser ablation or laser melting process for obtaining the abrasive patterned surface texture 12. In this embodiment a surface area of the rod shaped body 6 is transformed and/or removed such that the surface roughness thereof is increased, e.g. between 1/1000 mm to 5/10 mm. One or more surface areas of the rod shaped body 6 that are not subjected to the laser treatment retain a smoother surface roughness.
In addition to utilizing a radiation source, e.g. laser source, for obtaining the abrasive patterned surface texture 12 as outlined above, it also possible that in an embodiment the method comprises the step of mechanically embossing the tip portion 10 or rod shaped body 6 through a rolling process, e.g. utilizing an embossing roll or embossing plate to mechanically impress embossments comprising raised and/or sunken areas within the single, flexible material of the rod shaped body 6. Such a mechanical embossing process is also capable of providing regular and/or random arrangements of surface recesses and/or projections within and on the rod shaped body 6 for increasing at least in part the surface roughness thereof.
The embodiments of the present invention have been described above with reference to a number of exemplary embodiments as shown in and described with reference to the drawings. Modifications and alternative implementations of some parts or elements are possible, and are included in the scope of protection as defined in the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2015102 | Jul 2015 | NL | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2016/065981 | 7/6/2016 | WO | 00 |
