NL2016493B1 - Vitrectomy instrument with sleeve. - Google Patents

Vitrectomy instrument with sleeve. Download PDF

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Publication number
NL2016493B1
NL2016493B1 NL2016493A NL2016493A NL2016493B1 NL 2016493 B1 NL2016493 B1 NL 2016493B1 NL 2016493 A NL2016493 A NL 2016493A NL 2016493 A NL2016493 A NL 2016493A NL 2016493 B1 NL2016493 B1 NL 2016493B1
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Netherlands
Prior art keywords
instrument
sleeve
vitrectomy
distal
vitrectomy instrument
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NL2016493A
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Dutch (nl)
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NL2016493A (en
Inventor
Coliene Dam-Huisman Adriaantje
Frederick Spaide Richard
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Crea Ip B V
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/007—Methods or devices for eye surgery
    • A61F9/00736—Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments

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  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)

Abstract

Vitrectomy instrument with a base part (2) and an instrument part (3). The instrument part (3) includes an elongated small diameter member (4) having an outer diameter of less than 0.9081mm with a distal end (4a) operable to enter an eye during use. The vitrectomy instrument (1) further has a sleeve part (5) surrounding at least in part the instrument part (3) and extending from the base part (2), intended for reinforcement and support of the instrument part (3). The sleeve part (5) is arranged to remain outside of the eye during use, and can freely move with respect to both the instrument part (2) and the base part (2).

Description

Vitrectomy instrument with sleeve Field of the invention
The present invention relates to a vitrectomy instrument, in particular a vitrectomy instrument comprising a base part and an instrument part, the instrument part comprising an elongated small diameter member with a distal end operable to enter an eye during use.
Prior art
American patent publication US 8,202,277 discloses a vitrectomy instrument with a fixed length support sleeve surrounding a small diameter vitrectomy instrument portion, which instrument portion is configured to enter an eye.
Summary of the invention
The present invention seeks to provide a vitrectomy instrument with a support sleeve providing an improved support function for optimizing positional control of the vitrectomy instrument during all stages of an ophthalmic procedure.
According to the present invention, a vitrectomy instrument of the type defined in the preamble is provided, comprising a base part and an instrument part, the instrument part comprising an elongated small diameter member having an outer diameter of less than 0.9081 mm with a distal end being operable to enter an eye during use. The vitrectomy instrument further comprises a sleeve part extending from the base part and surrounding or enclosing at least in part the instrument part, wherein the sleeve part is arranged to remain outside of the eye during use, and wherein the sleeve part is further arranged to freely move with respect to both the instrument part and the base part (i.e. along a longitudinal axis of the vitrectomy instrument).
The vitrectomy instrument of the present invention, and in particular the freely moveable sleeve part thereof, provides a self-adjustable support function for optimal support and reinforcement of the instrument part during use in relation to an insertion depth of the instrument part into an eye. The reinforcement of the instrument part is provided during use, without necessitating to use an instrument part with a shorter length. This also allows to use a vitrectomy instrument with a long length instrument part, allowing the user to keep the base part further away from the actual operating point, e.g. inside an eye. More specifically, as the sleeve part is freely moveable with respect to the instrument part and the base part, the instrument part external to the eye is supported laterally and stiffened by the sleeve part over a support length or distance in longitudinal direction between the eye and the base part in direct relation to a changing insertion depth of the instrument part into the eye. The change of insertion depth is initiated by a user positioning the instrument part of the vitrectomy instrument into a desired position and orientation. The support length provided by the sleeve part thus changes identically in response to changing the insertion depth of the instrument part instead of manually adjusting the support length through a separate command by a user.
According to the embodiments of the present invention, a mere displacement of the vitrectomy instrument toward or away from the eye when the instrument part is has entered the eye yields an automatic shortening of the support length as provided by the sleeve part in direct relation to increasing the insertion depth of the instrument part and an automatic lengthening of the support length as provided by the sleeve part in direct relation to reducing the insertion depth.
It is noted that the vitrectomy instrument embodiments disclosed in US patent publication US8,202,277 have a support sleeve or support frame that is always fixed to the base unit, and thus cannot move freely with respect to the base unit.
The present invention embodiments can either be gravity operated (especially useful when using the vitrectomy instrument in an upright orientation), or spring based. The spring based embodiments include either an internally or externally positioned spring element, e.g. a coaxial coil spring.
Short description of drawings
The present invention will be discussed in more detail below, using a number of exemplary embodiments, with reference to the attached drawings, in which
Figure 1 shows a cross sectional view of an embodiment of a vitrectomy instrument according to the present invention;
Figure 2A and 2B each show a close up view of an embodiment of the vitrectomy instrument in use according to the present invention; and
Figure 3 shows a cross sectional view of an even further embodiment of the vitrectomy instrument according to the present invention.
Detailed description of exemplary embodiments
Vitrectomy instruments of various types typically utilize a thin needle-like element, hereunder referred to as an instrument part, for insertion into an eye during operations. Over the years, dimensions of instrument parts have steadily been reduced, particularly the diameter thereof, as it became evident that reducing the size of an ocular incision is beneficial to a patient undergoing eye surgery. However, a negative side effect of having a smaller diameter for the instrument part is that the instrument part tends to bend or flex more easily, especially during handling and movement of the instrument when already a part is inserted into the eye.
From a surgical perspective precise and accurate control as well as predictable behavior of a tip portion or distal end of the instrument part is paramount to achieving optimal results. In practice, however, an instrument part exhibiting significant bending and flexure during use reduces predictable behavior of the instrument part when trying to accurately position the distal end.
In light of these negative effects of having an extremely thin instrument part there is a need for a vitrectomy instrument that provides improved positional control of the instrument part and distal end thereof for improved posterior work in the eye.
Figure 1 shows a cross sectional view of an embodiment of a vitrectomy instrument according to the present invention. In the embodiment shown, the vitrectomy instrument 1 comprises a base part 2 or gripping portion and an instrument part 3. Most embodiments of the base part 2 allow for manually handling and positioning the vitrectomy instrument 1. The instrument part 3 comprises an elongated small diameter member 4 having an outer diameter of less than 0.9081 mm (i.e. 20 gauge or less) and with a distal end 4a or tip portion 4a operable to enter an eye during use, e.g. in the form of a capillary tube.
The vitrectomy instrument 1 further comprises a sleeve part 5 extending from the base part 2 and surrounding or enclosing at least in part the instrument part 3. The sleeve part 5 is arranged to remain outside of the eye during use and is further arranged to freely move with respect to both the instrument part 3 and the base part 2.
According to the present invention, the sleeve part 5 is freely movable with respect to the instrument part 3 as well as the base part 2, e.g. under influence of a gravitational force as the vitrectomy instrument 1 is positioned in an upright position (e.g. vertically). The sleeve part 5 is able to provide a support length 5 of the instrument part 3 extending from the base part 2, leaving an insertion depth i of the instrument part 3. The insertion depth i may continuously change and so the support length 5 continuously changes as a user moves the vitrectomy instrument 1 into a desired position. Note that during use the sleeve part 5 is in abutment with a surface of the eye 10, or a trocar 11 on the eye surface through which the instrument part 3 extends, and is therefore prevented from entering the eye 10 (see also description of Fig. 2A and 2B below). The sleeve part 5 may be made from any material suitable for surgery applications, such as stainless steel, titanium, or other metals. Alternatively, the sleeve part 5 may be made from a plastic material, with a suitable wall thickness to provide the desired support for the elongated small diameter member 4. In general, an outer diameter of the sleeve part 5 is larger than the outer diameter of the elongated small diameter member 4, but e.g. less than the outer diameter of the base part 2.
In an exemplary embodiment the instrument part 3 is in sliding engagement with and extends through the sleeve part 5, allowing the sleeve part 5 to freely slide along the instrument part 3 as the insertion depth i changes during use. In an advantageous embodiment an inside surface of the sleeve part 5 is provided with an anti-friction coating, thereby minimizing friction and facilitating sliding engagement between the instrument part 3 and the sleeve part 5, and thus ensuring a maximum possible support length s that can be attained for a particular insertion depth i.
Without loss of generality, the insertion depth i may be envisaged and construed as a distance between the distal end 4a when it is positioned in the eye and the surface or outer boundary of the eye (see also Fig. 2A and 2B below). The support length 5 may be envisaged or construed as a distance between a distal end 5a of the sleeve part 5 and a distal end 2a of the base part 2. The support length 5 as provided by the sleeve part 5 offers lateral support and reinforcement along a longitudinal direction of the instrument part 3 for minimizing bending or flexure thereof.
As mentioned earlier, the sleeve part 5 is able to provide a self-adjustable support length s even for the thinnest or smallest instruments parts 3. For example, in advantageous embodiments, the elongated small diameter member 4 may have a diameter of less than 0.6414mm (23 gauge), e.g. less than 0.5144mm (25 gauge), e.g. equal to (or even less than) 0.4128mm (27 gauge).
In a further embodiment, the base part 2 (internally) comprises a distal sleeve stop member 6 and a proximal sleeve stop member 7, and the sleeve part 5 comprises a proximal flange 8 moveable between the distal sleeve stop member 6 and the proximal sleeve stop member 7. In this embodiment the distal sleeve stop member 6 in cooperation with the proximal flange 8 may prevent the sleeve part 5 from detaching from the vitrectomy instrument 1 when it is held in e.g. a vertical position and the instrument part 3 points downward. The proximal stop sleeve member 7 on the other hand may prevent the sleeve part 5 from entering the base part 2 beyond the distal end 5a when the vitrectomy instrument 1 is held in e.g. a vertical position and the instrument part 3 points upward.
In a practical embodiment, a distance d between the distal sleeve stop member 6 and the proximal sleeve stop member 7 is between 0.5 cm and 4 cm, e.g. 3 cm. This particular range for the distance d provides sufficient distance in various scenarios to reach the retina with the distal end 4a of the instrument part 3, i.e. the elongated small diameter member 4. Also, this range for the distance d further provides sufficient support to the instrument part 3 by the sleeve part 5 for preventing excessive bending and flexure.
In an embodiment, the distal sleeve stop member 6 comprises a tubular support member surrounding or enclosing the sleeve part 5 having a supported length / of at least twice a diameter of the elongated small diameter member 4. Depending on the type member 4 used, the supported length / may vary from of less than 0.1 cm to even more than 0.5 cm. This embodiment provides lateral support from the base part 2 to the sleeve part 5, thereby reducing flexure of the sleeve part 5 itself. In a further embodiment the tubular support member may be embodied as a bushing or a tubular aperture in the base part 2.
According to the present invention embodiments, the sleeve part 5 is freely moveable with respect to the instrument part 3 and the base part 2 with minimal friction. Advantageously, it is possible to move the sleeve part 5 along the instrument part 3 through only a simple movement of the vitrectomy instrument 1 alone. For example, in many scenarios the vitrectomy instrument 1 will be held in an upright position such that the instrument part 3 points downward. Under the influence of gravity the sleeve part 5 may then move out of the base part 2 extending towards a maximum support length s. As the distal end 4a enters the eye with increasing insertion depth i, the surface of the eye 10 or trocar 11 as mentioned earlier at a certain point will abut the distal end 5 a of the sleeve part 5 and as such push the sleeve part 5 into the base part 2. This ensures a continuously self-adjustable support length 5 in direct response to a varying insertion depth i. Withdrawing the insertion part 3 from the eye will of course allow the sleeve part 5 to move out of the base part 2 under the influence of gravity, so that the support length s increases.
In particular scenarios it may not be possible to work with the vitrectomy instrument 1 in an upright position as outlined above, whereby under the influence of gravity the sleeve part 5 can be forced to move. In a further embodiment, therefore , the vitrectomy instrument 1 is provided with a spring coil 9 positioned between the distal sleeve stop member 6 and the proximal sleeve stop member 7, as shown in the cross sectional view of Fig. 1. This embodiment allows the sleeve part 5 to be biased toward an extended position, in particular to its maximum support length s. The spring coil 9 can then be chosen to impose a minimal biasing force to allow the extended position of the sleeve part 5 for all positions of the vitrectomy instrument 1 yet allow the surface of the eye or the trocar as discussed earlier to block and push the sleeve part 5 into the base part 2 with minimal force as the insertion depth i increases. Hence, increasing and decreasing the insertion depth i allows the sleeve part 5 to move along the instrument part 3 in cooperative fashion to provide a self-adjustable support length 5 between the eye 10 and the base part 2 for all positions and orientations of the vitrectomy instrument 1.
In an embodiment, the sleeve part 5 may further comprise a radially extending distal flange at the distal end 5a of the sleeve part 5. The distal flange may be envisaged as e.g. a flaring portion of the distal end 5a of the sleeve part 5. The distal flange allows for an improved support and force distribution of the sleeve part 5 onto the eye 10 or trocar 11 when it is in abutment therewith.
The vitrectomy instrument 1 of the present invention does not, in principle, limit a length of the instrument part 3 with respect to the base part 2. More specifically, an embodiment is provided wherein the length of the instrument part 3 may be adjustable with respect to the base part 2 and can be pre-selected during a procedure. In case length adjustability of the instrument part 3 is not needed, an alternative embodiment is provided wherein the instrument part 2 is fixedly attached to the base part 2, guaranteeing a fixed length of the instrument part 3 at all times. In a further embodiment, the instrument part 3 is fixedly attached to the proximal sleeve stop member 7 in the base part 2, allowing the sleeve part 5 to move along the instrument part 3 into the base part 2 and guaranteeing alignment of the sleeve part 5 with the instrument part 3.
In an embodiment the sleeve part 5 may be implemented as a reinforcement capillary 10 for providing increased structural rigidity to and for receiving a proximal part of the instrument part 3.
Figure 2A and 2B each show a close up view of an embodiment of the vitrectomy instrument 1 in use according to the present invention. In particular, Figure 2A shows an intermediate position where the insertion depth i of the elongated small diameter member 4 is still at a maximum value and a corresponding support length s of the sleeve part 5 for preventing excessive flexure of the instrument part 3, is also still at a maximum value. Figure 2B depicts a situation wherein the distal end 4a of the elongated small diameter member 4 is entered at a maximum depth into the eye 10 for treatment of e.g. the retina.
In both Figures 2A and 2B it can be seen that the support length s of the sleeve part 5 is always optimized and covers at least the distance between the eye and the distal end 2a of the base part. From Figure 2A it can also be inferred that any longitudinal displacement of the base part 2 with respect to the eye allows the sleeve part 5 to be moved, e.g. in sliding fashion, along the instrument part 3 as it is in abutment with e.g. the surface of the eye 10 or a trocar 11. So based on Figure 2A and 2B it is clear that an increase of insertion depth i allows for an equal decrease of the support length s of the sleeve part 5 when the distal end 4a of the elongated small diameter member 4 is moved further into the eye 10. Conversely, decreasing the insertion depth i allows for an equal increase of the support length 5 of the sleeve part 5 as the distal end 4a is being retracted from the eye 10. As already mentioned above, the freely moveable sleeve part 5 may be moved through gravitational forces alone, which is advantages in an upright orientation of the vitrectomy instrument 1. However, an additional biasing force may also be provided by a spring member 9 to bias the sleeve part 5 to its most extended position in all orientations of the vitrectomy instrument 1. A further exemplary embodiment of the present invention vitrectomy instrument is shown in the cross sectional view of Figure 3. Elements having a similar function as elements described in relation to Figures 1 and 2A/B are indicated with the same reference numerals. This embodiment is a further alternative of the spring based embodiment described above with reference to Figure 1, and instead of an internally positioned spring element 9 enclosed in the base part 2, an externally positioned spring element 9 is provided, e.g. a coaxial coil spring.
In this embodiment, the base part 2 comprises a cavity 2b at a distal end 2a of the base part 2, providing space for movement of the sleeve part 5 surrounding the elongated small diameter member 4 of the instrument part 3. Furthermore, a retaining spring 9 is attached at one end to the sleeve part 5, e.g. using a radially extending distal flange 5b and at another end to the distal end 2a of the base part 2. The cavity 2b has a free distance for accommodating the sleeve part 5 indicated by d. This parameter can be seen as similar to the distance d between distal sleeve stop part 6 and proximal sleeve stop part 7 of the exemplary embodiment described with reference3 to Figure 1.
The retaining spring 9 is positioned coaxially to the sleeve part 5, and is e.g. attached to the distal flange 5b and the distal end 2a using welding, gluing or other attachment techniques. In a further embodiment, the elongated small diameter member 4 of the instrument part 3 is fixedly attached to the base part 2 along an anchoring depth a. This will allow proper fixation to the base part 2, as the distance d as indicated cannot support the elongated small diameter member 4. The sleeve part 5 extends into the cavity 2b along a supported length / (similar to the supported length as described with reference to the Figure 1 embodiment). This configuration again allows the elongated small diameter member 4 to have an insertion depth I as well as a support by the sleeve part 5 along a support length 5 which can vary depending on the actual use (e.g. the radially extending distal flange 5b being stopped by a surface of the eye, or by a trocar in the eye).
It is noted that in an even further group of embodiments, the attachment of the elongated small diameter member 4 in the base part 2 can be constructed to have a number of preset lengths of the instrument part 3, e.g. depending on intended use of the vitrectomy instrument 1 (e.g. in either the anterior or posterior part of an eye).
The above described exemplary embodiments can be described as the following numbered and mutually dependent embodiments:
Embodiment 1. Vitrectomy instrument, comprising a base part (2) and an instrument part (3), the instrument part (3) comprising an elongated small diameter member (4) having an outer diameter of less than 0.9081mm with a distal end (4a) operable to enter an eye during use, the vitrectomy instrument (1) further comprising a sleeve part (5) surrounding at least in part the instrument part (3) and extending from the base part (2), wherein the sleeve part (5) is arranged to remain outside of the eye during use, and wherein the sleeve part (5) is further arranged to freely move with respect to both the instrument part (2) and the base part (2).
Embodiment 2. Vitrectomy instrument according to embodiment 1, wherein the base part (2) comprises a distal sleeve stop member (6) and a proximal sleeve stop member (7), and the sleeve part (5) comprises a proximal flange (8) moveable between the distal sleeve stop member (6) and the proximal sleeve stop member (7). Embodiment 3. Vitrectomy instrument according to embodiment 2, wherein the distal sleeve stop member (6) comprises a tubular support member surrounding the sleeve part (5) having a supported length / of at least twice the diameter of the elongated small diameter member.
Embodiment 4. Vitrectomy instrument according to embodiment 2 or 3, further comprising a spring coil (9) positioned between the distal sleeve stop member (6) and the proximal sleeve stop member (7).
Embodiment 5. Vitrectomy instrument according to any one of embodiments 1-4, wherein a distance d between the distal sleeve stop member (6) and the proximal sleeve stop member (7) is between 0.5 cm and 4 cm, e.g. 3 cm.
Embodiment 6. Vitrectomy instrument according to any one of embodiments 1-5, wherein the instrument part (3) is fixedly attached to the base part (2).
Embodiment 7. Vitrectomy instrument according to any one of embodiments 3-5 when referring to embodiment 2, wherein the instrument part (3) is fixedly attached to the proximal sleeve stop member (7) in the base part (3).
Embodiment 8. Vitrectomy instrument according to embodiment 1, wherein the base part (2) comprises a cavity (2b) at a distal end (2a) of the base part (2), further comprising a retaining spring (9a) attached at one end to the sleeve part (5) and at another end to the distal end (2a) of the base part (2).
Embodiment 9. Vitrectomy instrument according to embodiment 8, wherein the instrument part (3) is fixedly attached to the base part (2) along an anchoring depth a.
Embodiment 10. Vitrectomy instrument according to any one of embodiments 1-9, wherein the sleeve part (5) comprises a reinforcement capillary.
Embodiment 11. Vitrectomy instrument according to any one of embodiments 1- 10, wherein an inside surface of the sleeve part (5) is provided with an anti-friction coating.
Embodiment 12. Vitrectomy instrument according to any one of embodiments 1- 11, wherein the sleeve part (5) further comprises a radially extending distal flange (5b). Embodiment 13. Vitrectomy instrument according to any one of embodiments 1- 12, wherein the elongated small diameter member (4) has a diameter of less than 0.6414mm, e.g. less than 0.5144mm, e.g. equal to or less than 0.4128mm.
The present invention embodiments have been described above with reference to a number of exemplary embodiments as shown in 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. It is further noted that the exemplary embodiments shown in the drawings and described above relate to a vitrectomy instrument with an elongated small diameter member 4 as a general example. The present vitrectomy instrument may be embodied as one of many known minimal invasive surgery instruments, not limited to vitrectomy applications. The elongated small diameter member 4 may include e.g. a forceps, a scissor, a vitrectomy cutter, a light probe, a laser probe, etc.

Claims (13)

1. Vitrectomie-instrument, omvattende een basisdeel (2) en een instrumentdeel (3), waarbij het instrumentdeel (3) een langgerekt lichaam met een kleine diameter (4) omvat dat een buitendiameter heeft van minder dan 0.908 lmm en met een distaai uiteinde (4a) dat bedrijfbaar is om tijdens gebruik een oog binnen te gaan, waarbij het vitrectomie-instrument (1) verder omvat een hulsdeel (5) dat ten minste gedeeltelijk het instrumentdeel (3) omgeeft en zich uitstrekt vanaf het basisdeel (2), waarbij het hulsdeel (5) is ingericht om buiten het oog te blijven tijdens gebruik, en waarbij het hulsdeel (5) verder is ingericht om vrij te bewegen ten opzichte van zowel het instrumentdeel (2) als het basisdeel (2).A vitrectomy instrument, comprising a base part (2) and an instrument part (3), the instrument part (3) comprising an elongated body with a small diameter (4) having an outer diameter of less than 0.908 lmm and having a distal end (4a) operable to enter an eye during use, the vitrectomy instrument (1) further comprising a sleeve member (5) that at least partially surrounds the instrument member (3) and extends from the base member (2), wherein the sleeve member (5) is adapted to remain out of sight during use, and wherein the sleeve member (5) is further adapted to move freely relative to both the instrument member (2) and the base member (2). 2. Vitrectomie-instrument volgens conclusie 1, waarbij het basisdeel (2) een distaai hulsstoplichaam (6) en een proximaal hulsstoplichaam (7) omvat, en het hulsdeel (5) een proximale flens (8) omvat die beweegbaar is tussen het distale hulsstoplichaam (6) en het proximale hulsstoplichaam (7).Vitrectomy instrument according to claim 1, wherein the base part (2) comprises a distal sleeve stop body (6) and a proximal sleeve stop body (7), and the sleeve part (5) comprises a proximal flange (8) movable between the distal sleeve stop body (6) and the proximal sleeve stop body (7). 3. Vitrectomie-instrument volgens conclusie 2, waarbij het distale hulsstoplichaam (6) een buisvormig ondersteuningslichaam omvat dat het hulsdeel (5) omgeeft, met een ondersteunde lengte / van ten minste tweemaal de diameter van het langgerekte lichaam met een kleine diameter.A vitrectomy instrument according to claim 2, wherein the distal sleeve stop body (6) comprises a tubular support body surrounding the sleeve part (5), with a supported length / of at least twice the diameter of the elongated body of small diameter. 4. Vitrectomie-instrument volgens conclusie 2 of 3, verder omvattende een schroefveer (9) die gepositioneerd is tussen het distale hulsstoplichaam (6) en het proximale hulsstoplichaam (7).Vitrectomy instrument according to claim 2 or 3, further comprising a coil spring (9) positioned between the distal sleeve stop body (6) and the proximal sleeve stop body (7). 5. Vitrectomie-instrument volgens één van de conclusies 1-4, waarbij een afstand d tussen het distale hulsstoplichaam (6) en het proximale hulsstoplichaam (7) tussen 0.5 cm en 4 cm bedraagt, bijvoorbeeld 3 cm.Vitrectomy instrument according to any of claims 1-4, wherein a distance d between the distal sleeve stop body (6) and the proximal sleeve stop body (7) is between 0.5 cm and 4 cm, for example 3 cm. 6. Vitrectomie-instrument volgens één van de conclusies 1-5, waarbij het instrumentdeel (3) vast is bevestigd aan het basisdeel (2).Vitrectomy instrument according to any of claims 1-5, wherein the instrument part (3) is fixedly attached to the base part (2). 7. Vitrectomie-instrument volgens één van de conclusies 3-5 wanneer verwezen is naar conclusie 2, waarbij het instrumentdeel (3) vast is bevestigd aan het proximale hulsstoplichaam (7) in het basisdeel (3).Vitrectomy instrument according to any of claims 3-5 when reference is made to claim 2, wherein the instrument part (3) is fixedly attached to the proximal sleeve stop body (7) in the base part (3). 8. Vitrectomie-instrument volgens conclusie 1, waarbij het basisdeel (2) een holte (2b) omvat aan een distaai uiteinde (2a) van het basisdeel (2), verder omvattende een vasthoudveer (9a) die aan één uiteinde bevestigd is aan het hulsdeel (5) en aan een ander uiteinde aan het distale uiteinde (2a) van het basisdeel (2)·The vitrectomy instrument of claim 1, wherein the base member (2) comprises a cavity (2b) at a distal end (2a) of the base member (2), further comprising a retaining spring (9a) attached to the end of one sleeve member (5) and at another end to the distal end (2a) of the base member (2) 9. Vitrectomie-instrument volgens conclusie 8, waarbij het instrumentdeel (3) vast is bevestigd aan het basisdeel (2) over een verankeringsdiepte a.Vitrectomy instrument according to claim 8, wherein the instrument part (3) is fixedly attached to the base part (2) over an anchoring depth a. 10. Vitrectomie-instrument volgens één van de conclusies 1-9, waarbij het hulsdeel (5) een verstevigingscapillair omvat.Vitrectomy instrument according to any of claims 1-9, wherein the sleeve part (5) comprises a reinforcement capillary. 11. Vitrectomie-instrument volgens één van de conclusies 1-10, waarbij een binnenoppervlak van het hulsdeel (5) voorzien is van een anti-frictiecoating.Vitrectomy instrument according to any of claims 1-10, wherein an inner surface of the sleeve part (5) is provided with an anti-friction coating. 12. Vitrectomie-instrument volgens één van de conclusies 1-11, waarbij het hulsdeel (5) verder een zich radiaal uitstrekkende distale flens (5b) omvat.The vitrectomy instrument of any one of claims 1-11, wherein the sleeve member (5) further comprises a radially extending distal flange (5b). 13. Vitrectomie-instrument volgens één van de conclusies 1-12, waarbij het langgerekte lichaam met een kleine diameter (4) een diameter heeft van minder dan 0.6414mm, bijvoorbeeld minder dan 0.5144mm, bijvoorbeeld gelijk aan of minder dan 0.4128mm.Vitrectomy instrument according to any of claims 1-12, wherein the elongated body with a small diameter (4) has a diameter of less than 0.6414 mm, for example less than 0.5144 mm, for example equal to or less than 0.4128 mm.
NL2016493A 2016-03-24 2016-03-24 Vitrectomy instrument with sleeve. NL2016493B1 (en)

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