WO2020186365A1

WO2020186365A1 - Injector for interocular lenses and ram for an injector for interocular lenses

Info

Publication number: WO2020186365A1
Application number: PCT/CH2020/050002
Authority: WO
Inventors: Volker Dockhorn
Original assignee: Medicel Ag
Priority date: 2019-03-15
Filing date: 2020-03-13
Publication date: 2020-09-24
Also published as: CH715932A1

Abstract

The invention relates to an injector for intraocular lenses and its ram. The injector comprises at least - an injector housing (1) having a piston passage (2), - a nozzle (11) having a nozzle channel (101) tapering towards the distal nozzle opening (107), - a plunger (9) which is mounted in the piston passage (2) so as to be longitudinally movable and so as to define an push axis, a ram (10) being formed distally on the plunger (9), the distal end face of which ram forms a push surface (61), - a loading chamber (36) for the lens. According to the invention, the push surface (61) of the ram (10) has at least one first region (65) and one second region (67), the first region (65) of the push surface (61) being designed to push rear haptics (44) of a lens, which lies in the loading chamber (36), forward, and the second region (67) of the push surface (61), which projects further in the pushing direction than the first region (65), being designed to come into contact with the haptics projection (93) of the lens in order to push the lens in the loading chamber (36) towards the nozzle channel (101) via pressure exerted on the haptics projection (93).

Description

Injector for interocular lenses and

Stamp for an injector for interocular lenses

TECHNICAL FIELD OF THE INVENTION

The present invention relates to an injector for intraocular lenses and a stamp of an injector suitable for ejecting a lens from the injector.

BACKGROUND OF THE INVENTION In cataract operations nowadays, artificial lenses, so-called intraocular lenses, are inserted into the capsular bag of the eye as standard.

During the operation, an ocular incision of typically 2 to 4 mm is made through which the natural lens of the eye is first removed and then the implant is inserted. For insertion, the folded artificial lens is inserted through the incision into the capsular bag. As soon as the folded lens is inserted into the capsular bag, it unfolds back into its original shape.

The artificial lenses customary today consist of an optical lens body and usually two or more haptics projecting peripherally from this transversely to the optical axis of the Linsenkör pers, which serve in the capsular bag as position springs for the lens body. For example, two haptics, which are arranged opposite one another on the lens body, spiral in the same direction from the lens body. This haptic form, which is most frequently used worldwide, is called open c-loop haptic in the laughing industry.

Improved surgical tools and implants allow surgeons to make the incisions noticeably smaller. The natural lens of the eye can now be removed through incisions of less than 2 mm. However, this only makes sense if the intraocular lens can also be injected into the eye through such a small incision. For inserting an intraocular lens, lens carriers or cartridges have been developed in recent years, into which a lens can be loaded and then ejected from the lens carrier by means of an injector.

Examples of such lens carriers or cartridges and injectors are, for example, from US Pat. No. 6,267,768, US Pat. No. 5,810,833, US Pat. No. 6,283,975, US Pat. No. 6,248,111, US Pat. No. 4,681,102, US Pat. No. 5,582,614, US Pat. No. 5,499,987, US Pat 5 947 975, US 6 355 046 and EP 1 290 990 B1, as well as the disclosures US 2004/0199174 A1, EP 1 905 386 A1 and WO 03/045285 A1 are known.

In the case of the injector device according to US Pat. No. 4,681,102, the cartridge, which is designed as a splitting device for the lens, and the injector nozzle are separate parts. The cartridge can be pushed into the injector housing, whereupon the injector nozzle can be screwed onto the front of the injector housing.

In the injector device according to US 5582614 and most of the previously known injector devices, e.g. US 6267768, US 5810833, US 6283975 and US 6248 111, the cartridge consists in one piece of a holder and an injector nozzle.

Usual cartridge designs, as shown in EP 1 290 990 B1, WO 03/045285 A1, EP 1 905 386 A1, US Pat. No. 5,582,614 and US Pat. No. 5,499,987, have two half-shells connected by a single hinge, be it with or without grooves or holding means for fitting the lens edges.

Intraocular lenses are packaged sterile by the manufacturer and, if necessary, supplied in a fluid bath. Depending on the lens material, storage in a liquid may be necessary to protect the lens from drying out. During the operation, the lens must be removed from the packaging in the sterile area and inserted or loaded into the loading device of an injector or directly into an injector using the cartridge supplied. The lenses are very sensitive structures which can easily be damaged when reloading into a cartridge, splitting or ejecting from the injector nozzle. The risk of damage is particularly great for the haptics that surround the optical part of the lens. In particular, there is a risk that the front haptic in the loading device and / or the rear haptic between the piston and a the wall area of the loading device or the nozzle surrounding the piston is clamped and is consequently torn off during ejection. Further problems arise if the anterior haptics, leading the lens body, spread prematurely in the eye or the rear haptics follow the lens body with a delay and, as a result, subsequently change the correct positioning in the eye.

The disclosure WO 03/045285 A1, for example, shows a method for inserting an intraocular lens into the capsular bag of the eye, in which an overpressure is generated in order to eject a lens floating in a lubricant from the injector nozzle. A compressible and, if necessary, elastic piston adapts continuously to the nozzle channel which narrows towards the front. The lens continues to fold on its way and has a very small diameter at the end of its way. Due to the compressibility of the piston, the end of the nozzle channel can be kept very narrow, so only a very small incision is necessary. A set for executing the method contains a lens carrier and a lens. The lens is in a tension-free state in the lens carrier. Lens and lens carrier are preferably carried by a holder and packed sterile ver until use in a pack, in the case of a hydrophilic lens in a liquid that protects the lens from drying out. During the operation, the lens carrier and the lens stored in it are removed from the pack, inserted into the injector and folded. A lubricating liquid is poured in through the channel. The lens can now be injected into the capsular bag of the eye to be treated.

There are also injector systems which use completely different pistons. This also includes non-planar piston tips or piston pistons, as shown in EP1'832'247B1, US2003195522A1, W09726844A2 and US6W520B1 and US5582614A. Such punches often serve to hold the lens, i. in particular to pick up the lens body like a shovel (especially in EP1'832'247B1, US6W520B1, US2003195522A1,

W09726844A2) so that the piston does not run over the lens. The rear haptic may or should fall behind the face of the stamp and is thus, so to speak, drawn in during the lens injection. In practice, jamming of the haptics, in particular the trailed rear haptics, cannot be ruled out in these systems. In the disclosure EP 2 177 178 A1 a device with a piston and nozzle for inserting an intraocular lens into an eye is provided, the piston having a lens contact section for abutting the lens optics and a pushing section for pushing out the rear haptics.

In the document WO 96/28122 A1 a surgical implantation device with a piston for inserting a deformable intraocular lens into the eye is presented, where the piston tip is configured such that a lateral distance between the piston tip and the lens insertion passage of the implantation device exists in order to avoid the trailing haptics Take up the intraocular lens and avoid damaging the trailing haptics.

In the laid-open specification WO 97/15253 A1, an intraocular lens injection apparatus with a movable piston with a deformable, in particular elastically deformable piston tip is described. This piston tip is deformed when the intraocular lens is ejected through a narrowing nozzle.

The laid-open specification US 2008/0058830 A1 discloses a system for transferring an intraocular lens (IOL) from a lens container into the loading chamber of an injector and then from the injector into the patient's eye. The haptics in the lens container are preferably folded over the optics and held in this position during the transfer of the intraocular lens into the loading chamber. A shuttle is provided for the splitting and the transfer, which grips and manipulates at least the rear haptics. For the injection into an eye, a piston is provided which passes through the shuttle in order to push the lens stored in front of the shuttle through the injector nozzle.

In general, systems for pre-folded lenses and systems for non-pre-folded lenses can be distinguished in the prior art. In systems without pre-folded lenses, the lenses are only folded during the pushing process for injection. For this purpose, systems are used in particular in which the lens is loaded into a loading chamber from the rear, still in the deformed state or unfolded (as shown, for example, in US Pat. No. 5,810,833). The rear opening into which the lens is inserted is at least as wide and high as the lens itself. If a piston with deformable Tip (usually made of silicone or TPE) is used, the plunger tip must fill the entire volume of the rear opening so as not to run the risk of running over the rear of the two haptics and thus becoming trapped. This large volume of the deformable plunger tip leads to high system forces when the plunger is advanced into the maximally tapered area of the cartridge tip. The forces caused by this can even be greater than the forces caused by the lens itself. In addition, the expandability or compressibility of the voluminous piston tip limits the minimum necessary inner diameter of the front nozzle tip. For these reasons, systems are still frequently used to this day in which the lenses are folded or pre-folded before the injection process. For this purpose, wing cartridges (as disclosed, for example, in US Pat. No. 6,267,768, US Pat. No. 6,248,111, US Pat. No. 5,947,975 or US Pat. No. 4,681,102) are used, which always consist of at least two initially opened half-shells. When the at least two half-shells are closed, the lens is folded before and is in the loading chamber in the folded state. The pre-folding of the lens including the haptics by closing the winged cartridge reduces the internal volume of the closed winged cartridge to almost half and thus enables the use of smaller deformable piston tips, which cause smaller incision forces with the same internal diameter of the cartridge tip, or the use of smaller cartridge insides with the same incision force - cause diameter and thus smaller incisions. The disadvantage of these systems for pre-folding the lenses is that in particular the lens cover, and in the worst case even the optics, can be pinched between the two wings when the two wings of the cartridge are closed. Jammed haptics usually tear off as the lens is advanced further, which amounts to a total loss of the lens.

In the disclosure WO 2015/070358 A2, a winged cartridge for receiving an intraocular lens in a loading chamber is presented. The winged cartridge is formed by a first and a second half-shell, each half-shell having a winged handle along its length. The two half-shells are articulated to each other on the wingless longitudinal side via a first joint and can be moved relative to one another from an open position to a closed position by means of the first joint, the two half-shells being one in the closed position Form the discharge channel for an interocular lens. A jamming of the at least before their haptics when closing is prevented here by a cover member.

When injecting the lens, it is undesirable for the front haptic to enter the eye, stretched, ahead of the lens. The problem that arises for the surgeon in this case is, on the one hand, that the lens tries to follow the imsymmetrical front haptic and can therefore rotate in the eye when unfolded and even tip over completely, so that the surgeon in cramped conditions Eye, the lens must first be aligned again in the desired position. Another reason that surgeons do not like it when the anterior haptic comes out stretched out is that, particularly with stiffer lens materials, there is a risk that the haptic will dig into the capsular bag and lead to a capsular rupture. It is therefore he wishes that the front haptic either rests in an arc on the optic or even rests on the optic and is enclosed by the optic when the lens is folded. Since the latter is associated with an increased lens volume and therefore an enlarged incision size and often haptics on the optic stick to it, it is preferred in most cases to only place the front haptic against the optic, but not on the optic.

WO2015 / 070358 describes a loading chamber with an integrated stopper at the end of the loading chamber. By pushing the injector piston against the rear haptic, the force effect should be transferred to the optics and the lens should be pushed in the direction of advance until the front haptic hits the stopper and the optic rests against the front haptic. Unfortunately, this process does not work fully reproducible and universally for all lens materials and haptic designs. Since the piston tip only hits the rear, freely movable haptic and the force is only indirectly transferred to the optic, it can happen that the rear haptic is pressed heavily onto the optic without the optic itself moving. In particular, this can easily happen if the lens optics sticks something to the loading chamber wall, which is often the case with so-called preloaded lenses. Pre-charged lenses are those lenses in which the lens is already inserted into the injector at the factory and is stored in it for the life of the product. If this happens that the rear Hapük is pressed strongly against the optics, which If, for its part, it may not move or move only insufficiently, this has the consequence that the rear haptic is severely deformed by excessive pressure and the front haptic is not even pressed against a possible stopper, whereupon the front haptic again emerges stretched out of the loading chamber.

Another problem can be that the silicone stamp is pushed too far out of the cartridge tip. The fact that the nozzle is inclined at the tip and the doctor looks through the microscope at the upper, longer side makes it difficult for him to see when the punch has already reached the edge of the lower, shorter side. As soon as the stamp goes over the edge, it expands (so-called "blooming") and can then no longer be withdrawn like a dowel. This results in the risk that the incision in the eye can tear if the punch is pulled out of the eye in an expanded position.

Another problem can also be that the lens with the c-loop handle can rotate a few degrees around its center of the optics in the rest position within the loading chamber. This rotation is greater, the shorter the c-loop handles are, since they limit the rotation by stopping against the loading chamber wall. Even if the length of the lens is limited in the loading chamber, the rotation of the lens about its center point (i.e. about its optical axis) is possible within the stated limits. Correspondingly, the alignment of the lens and its haptics also differ when it emerges from the cartridge into the eye. The surgeon often has to counteract this by carefully turning the injector, which repeatedly poses problems, especially for inexperienced surgeons.

Another problem can be that when the loading chamber is closed, ie while the lens is being folded, the rear haptic stretches backwards and wraps around the plunger. This happens, for example, when a rear haptic points backwards, ie towards the ram (eg due to the shape of the haptic itself or due to unfavorable manipulation when inserting the lenses into the loading chamber). A faulty injection is to be expected, since the rear haptics become more and more wedged between the stamp and the cartridge wall as the lens is further advanced. TASK

It is the object of the present invention to eliminate or minimize the aforementioned disadvantages as far as possible. In particular, it is the task to provide an injector system which avoids the disadvantages of the known systems and methods described. It is also an object of the present invention to create an alternative injector or an alternative injector system in which the front and rear haptics are reproducibly and essentially always applied to the optical body to the same extent. If possible, the haptics should only fold away from the optics in the eye. In particular, the problem of blooming of the silicone stamp and the problem of rotation of the lens in the loading chamber should be prevented.

Furthermore, it is an object of the present invention to provide a device which folds an intraocular lens without it being damaged when it is folded and / or injected. Furthermore, a device is to be provided which is optimized with regard to the manipulation steps for preparing the lens and injector. In particular, as few manipulation steps as possible should be necessary, which must be carried out after delivery of the lens and injector or which must be carried out immediately before the surgical intervention on the device. In addition, a device is to be provided which manages with as few additional components as possible, in the best case even without any additional components in relation to the injectors and thus the above-mentioned Goal achieved without generating additional costs.

In particular, it is also an object of the present invention to provide an alternative device or an alternative system for pre-charged interocular lenses.

The object is preferably to be achieved in such a way that no additional parts, no additional costs and no additional application steps are associated with it. The system or the device should be suitable for fully-preloaded, semi-preloaded and non-preloaded lenses. The system should also work in conjunction with wing cartridges, in particular wing loading chambers that can be inserted into injector housings. Another aim is to create a device which only requires small incisions in the eye in use.

SUMMARY OF THE INVENTION

Disclosed is an intraocular lens injector comprising

- an elongated injector housing with a longitudinal piston passage,

- a nozzle, which is attached distally to the housing, with a distal nozzle opening and a nozzle channel narrowing towards the distal nozzle opening in an axial extension of the piston duct,

a plunger which is longitudinally displaceable in the piston passage, is mounted defining a thrust axis and can be pushed towards the nozzle opening, a plunger being formed distally on the plunger, the distal end face of which forms a thrust surface,

- A loading device with a loading chamber for an interocular lens, the loading device being provided in a recess of the housing between the piston duct and the nozzle channel of the nozzle and being laid out in such a way that the loading chamber can be pierced by the plunger for the purpose of ejecting a lens, so that a lens , which is contained in the loading device, can be ejected from the loading chamber and subsequently through the nozzle channel,

The injector is characterized in that

- The abutment surface has at least two areas, a first area and a second area, the first area of the abutment surface being designed to push forward a rear haptic of a lens located in the loading chamber, and the second area of the abutment surface , which protrudes further in the direction of impact than the first area, is designed to come into contact with the haptic attachment of the lens in order to push the lens through pressure on the haptic attachment in the loading chamber in the direction of the nozzle channel (101). It is advantageous that

- The abutment surface in relation to the loading chamber and the lens positioned therein is directed in such a way that the protruding second area essentially hits the haptic attachment of the rear haptic with its center during the advance, while the first area, in contrast, is remote from the haptic hits the rear Hapük.

It is advantageous that the abutment surface of the stamp

- in the first region has a first surface which is oriented essentially perpendicularly with respect to the impact axis and which extends to the peripheral edge of the impact surface, and

- in the second area has a second surface which is inclined with respect to the impact axis and which extends to the peripheral edge of the impact surface and protrudes distally.

The term "essentially perpendicular" (in the previous paragraph) conveniently means that the first surface, which is perpendicular to the impact axis, forms an angle of 90 ° ± 10 ° (ie maximum deviation of 10 ° from a 90 ° angle) or preferably 90 ° ± 5 ° (ie maximum deviation of 5 ° compared to a

90 ° angle), more preferably 90 ° relative to the impact axis. In comparison with the term “inclined”, however, the term “essentially perpendicular” means at least that the first surface formed perpendicular to the joint axis is more angled relative to the joint axis than the oblique second surface is.

It is advantageous that the end face of the stamp is designed as a stamp pad, which is characterized in that it has a periphery that is wider than the periphery of a stamp shaft which carries the stamp pad.

It is advantageous that the peripheral contour of the stamp, in particular the peripheral edge of the stamp pad, is adapted to the cross section of the loading chamber, so that when the loading chamber is closed, at least from the abutment surface, there are no cavities between the loading chamber wall and the stamp or, in particular, between the loading chamber wall and the stamp pad occur. It is preferred that the peripheral edge of the stamp pad corresponds to the cross section of the loading chamber or exceeds this in the uncompressed state and preferably the peripheral contour of the shaft in the uncompressed state is smaller than the cross section of the loading chamber.

It is advantageous that the cross section of the peripheral edge of the stamp, in particular of the stamp pad and preferably also of the stamp shaft, exceeds the cross section of the nozzle opening in the non-compressed state.

It is advantageous that are formed in the loading chamber collision axis parallel guide structures for the lens which such ken with a notch of the punch _Z usammenwir that the punch is guided accumulation structure in its piercing by the charging chamber by means of Ldg.

It is advantageous that the loading chamber or nozzle channel and die are designed to be adapted to one another in their respective shape in such a way that the entire lens, i.e. including optics and all of their one or more haptics, when the stamp pierces through the loading chamber and nozzle channel in front of the abutment surface of the stamp, no haptics can get between the stamp periphery and the loading chamber or nozzle.

It is advantageous that the first surface and the second surface of the stamp are inclined towards one another at an obtuse angle.

It is useful that the obtuse angle is 135 ° ± 30 °, preferably 135 ° ± 20 °, preferably 135 ° ± 10 °, more preferably 135 ° ± 5 °.

It is expedient that the first surface and the second surface meet and together form an inner edge (also negative edge or groove; hereinafter referred to as edge).

It is preferred that the edge of the abutment surface of the stamp and the optical axis of the lens are aligned essentially parallel to one another or with a certain deviation from the essentially parallel alignment, preferably with a deviation in a range from 0 ° to 75 ° 10 ° to 60 °, more preferably 20 ° to 55 °, more preferably 30 ° to 50 ° (angular degrees), in particular with a deviation in rotation about the direction of impact in the stated range of 0 ° to 75 °, preferably 10 ° to 60 °, more preferably 20 ° to 55 °, further preferably 30 ° to 50 °.

It is advantageous that the stamp has a notch which runs on the periphery of the stamp and preferably protrudes from the periphery into the second surface.

It is preferred that the notch in the punch runs perpendicular to the edge (i.e. parallel to the direction of impact), preferably without breaking through the edge.

It is advantageous that a first, tapering punch shaft extends between the distal end and the proximal end from the distal end to the proximal end.

It is preferred that a second, preferably essentially straight, shaft part is integrally formed on the tapering punch shaft towards the proximal end.

It is advantageous that the punch consists or is made essentially of a deformable, preferably compressible, more preferably elastic material. In particular, the material can be elastically deformable and / or elastically compressible.

It is advantageous that the stamp consists or is made essentially of silicone, thermoplastic elastomer (TPE) or a combination thereof.

It is useful that the first surface directly adjoins the second surface, preferably so that the two surfaces added together form the entire joint surface.

It is expedient that the second area makes up more than half of the total abutment area and preferably that the first area makes up the remainder of the abutment area.

It is advantageous that the stamp has a mirror plane in which the impact axis lies, and preferably that the maximum surface length - measured in the respective surface in a line parallel to the mirror plane - is greater than in the second area (or in the second surface) in the first area (in the first area). It is advantageous

- that the loading device is designed with two shells, comprising two half-shells which are articulated to one another via a common joint,

- That the two half-shells in the open position together form a loading area, the first half-shell being remote from the joint (and parallel to the axial alignment of the joint)

13 defines a first edge and the second half-shell defines a second edge of the loading area,

- That the two half-shells can be closed against each other by relative rotation around the joint joint by means of the two edges, in order to form an essentially closed loading chamber with a closure side defined by the two edges, with one previously on the loading surface of the lens placed against each other open half-shells is folded towards the closure side, and

- That the stamp and the loading device are arranged in relation to each other in such a way that the second area, equipped with a distally protruding inclined surface, slides along the locking side on the inside of the mutually closed half-shells when it penetrates the closed loading chamber, in order to push the haptic attachment.

The injector preferably contains an interocular lens, which can be preloaded in the loading device, the interocular lens preferably being a lens with two haptics which are arranged diametrically to one another in the plane of extension of the lens on the lens body and in the plane of extension of the lens protrude in the same direction from the lens body in a spiral shape.

Also disclosed is a punch of an injector for an intraocular lens suitable for ejecting a lens from the injector, the punch being compressible in order to be able to continuously adapt to the increasingly narrowing nozzle channel when ejecting a lens, the punch comprehensively proximal end and a distal end, the proximal end and the distal end defining a thrust axis and a thrust direction and the distal end of the punch face forms an impact surface, while the distal end serves or is designed to be attached to a plunger tip or even as The plunger is executed, the Stamp is characterized by the fact that the joint surface

- has in a first region a first surface which is essentially perpen dicularly aligned with respect to the impact axis and extends to the peripheral edge of the impact surface, and

- In a second area has a second surface which is inclined with respect to the impact axis and which extends to the peripheral edge of the impact surface and protrudes distally.

It is advantageous that the first surface and the second surface are inclined towards one another at an obtuse angle.

It is preferred that the obtuse angle is 135 ° ± 30 °, preferably 135 ° ± 20 °, preferably 135 ° ± 10 °, more preferably 135 ° ± 5 °.

It is advantageous that the first surface and the second surface meet and jointly form an inner edge (also negative edge or groove; hereinafter referred to as edge).

It is advantageous that this has a notch which runs on the periphery of the punch and preferably protrudes from the periphery into the second surface.

It is preferred that the notch runs perpendicular to the edge (i.e. parallel to the direction of impact), preferably without breaking through the edge.

It is advantageous that the distal end is designed as a stamp pad, which is characterized in that it has a periphery that is wider than the periphery of the shaft of the stamp.

It is advantageous that this consists or is made essentially of a deformable, preferably compressible, more preferably elastic material. In particular, the material can be elastically deformable and / or elastically compressible. It is advantageous that this consists essentially of silicone, thermoplastic elastomer (TPE) or a combination thereof.

It is advantageous that the first surface directly adjoins the second surface, preferably so that the two surfaces added together form the entire abutting surface (and thus the entire end surface).

It is advantageous that the stamp has a mirror plane in which the impact axis lies, and preferably that the maximum surface length - measured in the respective surface in a fin parallel to the mirror plane - is greater than in the second area (or in the second surface) in the first area (in the first area). It is advantageous that the second area makes up half or more than half of the total abutment area and preferably that the first area makes up the remainder of the abutment area.

BRIEF DESCRIPTION OF THE FIGURES Further preferred embodiments of the invention emerge from the description that follows based on the figures. They show schematically, but not to scale:

Figure 1: an oblique view of an injector with nozzle, inserted thread

_The device is in the open position and the ram with a punch according to the invention is in the advanced position abutting the fin;

FIG. 2: an optical fin with a first (front) folded-in haptic and a second (rear) opened haptic;

FIG. 3: a view obliquely from above into an open threading device with the punch pushed forward just as far as the fin;

FIG. 4: an oblique view of a stamp (so to speak, obliquely from above); FIG. 5: a view from above into an open loading device with the punch pushed forward just up to the lens;

FIG. 6: a side view of a stamp (from above, so to speak);

Figure 7 is a front view of a punch (i.e. a view of the abutment surface of the punch);

FIG. 8: a rear view of a stamp;

FIG. 9 is a view from above at an angle into an alternative loading device with a stopper.

DETAILED DESCRIPTION OF THE FIGURES

In the following, the same reference numbers stand for the same or functionally identical elements (in different figures). In Fig. 1, an injector with injector housing 1 and the device 3 Ladevorrich inserted therein is shown.

The injector is an operating tool with a sleeve-like housing 1 with a housing 2, a nozzle 11 and a plunger 9 (also called a piston) which is taken in the housing 2 and is axially movable towards the nozzle 11. A recess or recess is preferably provided in the housing 1, into which a loading device 3, preferably designed as a cartridge, is inserted and / or inserted. The loading device 3 (or hereinafter also referred to as lens carrier) serves to hold a lens 4. The loading device 3 is preferably designed as an exchangeable cartridge. The La devorrichtung 3 has a loading chamber 36 which, in the closed position, forms a channel or passage which leads to the nozzle 11 in an axial extension of the housing passage 2. The nozzle 11 tapers in the axial direction towards the tip 107. The nozzle 11 forms the distal end of the injector and connects distally to the loading device 3. The loading device or the cartridge 3 is placed in the injector housing 1 or is held in the injector housing 1 in such a way (for example via a plug-in device 53) that the closed loading chamber 36 is arranged in alignment with the piston passage 2, in particular in such a way that when the plunger 9 is advanced, it penetrates in an axial movement into the channel leading through the closed loading chamber 36 and thereby pulls the lens 4 out of the loading channel and through the injector nozzle 11 or whose nozzle channel 101, which narrows towards the tip 107, pushes through it. The plunger 9 can be pushed forward manually, for example by pressing on its proximal end. The proximal end 55 of the plunger 9 can be equipped with a widened sliding surface. Further to the front of the housing 1, lateral gripping surfaces 109 are expediently provided, which are designed as counter-pressure surfaces for manual actuation of the injector (for example by three-finger grip). If the loading device 3 is designed as a cartridge, this has a vore res end 5 and a rear end 7. Inserted into an injector housing 1, the plunger 9 can be inserted from the rear end 7 into and through the loading device 3 towards the front end 5 of the loading device 3 and further into the nozzle 11. The longitudinal axis of the plunger 9 or the piston duct, which are each directed towards the nozzle opening, define a thrust axis and, in relation to the nozzle 11, a thrust direction.

The loading device 3 shown openly in FIGS. 1, 3 and 5 has two half-shells 13 and 15 which are connected to one another via a foldable connec 29, in particular a joint. The hinged connection 29 preferably has an axis of rotation which is positioned in the loading device 3 in such a way that when the loading device 3 is inserted into the injector housing 1, the axis of rotation is parallel to the joint axis (i.e. a joint 29 is preferably aligned longitudinally with respect to the joint axis). When the loading device 3 is closed, the first half-shell 13 rotates around the axis of rotation, while the second half-shell 15 is fixed in the housing 1. The half-shells 13, 15 preferably have wing handles 25, 27 for simplified manual manipulation. In the open position, the two half-shells 13, 15 together form a loading area 17, 19, with the first half-shell 13 having a first edge 21 and the second half-shell 15 having a second edge 23 of the loading area 17, 19 in a steered (and parallel to the axial alignment of the joint) Are defined. The two half-shells 13, 15 can be closed against one another by a relative rotation about the common joint 29 by means of the two edges 21, 23. By closing the half-shells 13, 15, the open loading chamber 36 closes and a loading channel (closed loading chamber) is created. A substantially closed loading chamber 36 has a closure side defined by the two edges 21, 23. When closing, a lens previously placed on the loading surface 17, 19 of the half-shells 13, 15 open to one another is folded in towards the closure side. The inner sides 17, 19 of the half-shells 13, 15 are designed such that a lens 4 inserted into the opened loading device 3, or in particular the lens body 41, is folded when the half-shells 13, 15 are closed. For this purpose, the loading chamber 36 or the inner surfaces 17, 19 of the half-shells are preferably designed as shown in WO2015 / 070358A2. That is, the inner surfaces 17, 19 are expediently equipped with Leitstruktu ren, ie for example grooves and / or rails 49, 51, which hold the lens 4 and especially its body 41 (in the transverse direction to the ram axis) when folded Allow the lens 4 to be pushed out of the closed La dekammer (in the ram push direction) for injection.

A frequently used interocular lens 4, as shown in Fig. 2, which can be inserted or preloaded in the loading device 3, consists of a lens body 41 with two haptics 43, 44 which are diametrically opposed to each other in the extension plane of the lens on the lens body 41 are arranged and in the plane of extension of the lens 4 protrude in the same direction spirally from the lens body 41. The lens presented in Fig. 2 shows a relaxed haptic 44 as well as an example of a haptic 43 pressed under pressure on the lens body 41. The lens shown in Fig. 2 is a view Darge presents, which is a lens plane perpendicular to the optical axis of the lens or of the lens body 41 shows.

According to the invention, the loading chamber 36 and the stamp 10 are designed and coordinated with one another in such a way that lenses with different haptic designs can be inserted therein and injected into an eye.

As mentioned in the introduction, injecting a lens is not improbable. In particular, the question always arises how to deal with the Hapüken.

An injector system with a specially developed and designed stamp 10 is presented here. A particularly preferred embodiment of a stamp 10 according to the invention is shown in FIGS. 4, 6, 7 and 8. The position of the stamp 10 in relation to the loading chamber 36 is shown in FIGS. 1, 3 and 5. As shown in FIGS. 4 and 6, the punch 10 according to the invention includes a distal end 59 and a proximal end 57, the two ends 57 and 59 in cooperation (or an axis connecting these two ends 57, 59) with an impact axis and define a strategic direction. The distal end 59 forms an abutment face 61 on the punch face (as shown for example in FIG. 7). The proximal end 57, on the other hand, is designed to be attached to a plunger tip. The proximal end 57 is expediently designed, for example, with a plug-in structure 63 (for example as shown in FIG. 8) in order to fasten the punch 10 on a distal end of a plunger 9 with a correspondingly adapted mating plug-in structure. Alternatively, the punch 10 can be designed as an integral part of the ram.

The abutment surface 61 (shown in oblique and frontal views in FIGS. 4 and 7) has a first area 65 which is oriented essentially perpendicularly with respect to the impact axis and extends to the peripheral edge of the abutment surface and in a second area Area has a second surface 67 which is inclined with respect to the impact axis and which extends to the peripheral edge of the impact surface and protrudes distally. The abutment surface 61 and thus the stamp front 59 is essentially formed from two areas or areas, in particular the aforementioned first area (area 65) and the aforementioned second area (area 67).

The inclined surface 67 protrudes distally in such a way that for surface points of the inclined surface 67 that lie on a line of intersection with a plane in which the

If the axis of impact lies, it is true that with increasing expansion towards the peripheral edge there is essentially (always) an increase in distal protrusion. The only exception is the cutting line, which also lies in the plane defined by the surface 65.

As shown in FIG. 1, the plunger 9 with the plunger 10 is expediently inserted in the injector housing 1 in such a way that the alignment of the slope of the surface 67 corresponds approximately to the nozzle opening 107. This can reduce blooming. The slope of the surface 67 can also have approximately the same slope as the slope of the nozzle opening 107. The first (ie perpendicular) surface 65 and the second (ie inclined) surface 67 are inclined towards one another at an obtuse angle (in particular FIG. 6). They thus form an inner edge (also negative edge or groove; hereinafter referred to as edge) 69 where they meet. The first surface 65 and the second surface 67 are expediently designed essentially as flat surfaces. In so far as the two surfaces 65, 67 are flat, the edge shows a straight course. The obtuse angle (or opening angle) between the two surfaces 65 and 67 expediently has an angular dimension of 135 ° ± 30 ° (degrees), preferably of 135 ° ± 20 °, more preferably of 135 ° ± 10 °, more preferably of 135 ° ± 5 °.

The first surface 65 preferably adjoins the second surface 67 essentially directly, preferably in such a way that the two surfaces added together essentially form the entire abutting surface (and thus essentially the entire end surface). The second surface 67 makes up approximately half or more than half of the total abutting surface 61. The first surface 65 preferably makes up the remainder of the abutting surface.

According to the embodiment shown here, the stamp can have a mirror plane which is applied parallel to the joint axis. As shown in FIG. 6, the maximum surface length of the second surface 67 is preferably greater than the maximum surface length of the first surface 65, each measured in a line parallel to the mirror plane.

The punch 10 has a notch 71 which expediently runs on the periphery of the punch 10. The notch 71 preferably projects from the periphery into the second surface 65, in particular centrally into the second surface 65, preferably without breaking through the edge 69. The notch 71 is preferably substantially parallel to the joint (i.e. parallel to the joint). The notch is used to guide the stamp and thereby avoid uncontrolled rotation around the impact axis (if a corresponding guide structure 49, 51 is present in the loading device).

The distal end 59 of the stamp 10 is designed, for example, as a stamp pad 73, while the proximal stamp part or parts formed behind the stamp pad 73 are essentially designed as a shaft 75, 77. The ink pad 73 has a Periphery 79, which is wider than the periphery of the shaft parts 75, 77 adjoining proximally thereto. As a result, a good fit between the punch 10 and the wall of the loading channel and / or of the nozzle channel 101 can be achieved. The peripheral edge of the two surfaces 65, 67 thus essentially marks the transition from the abutment surface 61 to the peripheral contour 79 of the stamp pad 73.

Between the distal end 59 and the proximal end 57, a tapering punch shaft 75 extends from the distal end 59 to the proximal end 57. A second, preferably essentially straight shaft part 77 can be formed following the first punch shaft 75.

The punch expediently consists of a deformable, compressible and / or elastic material or is essentially made of it. This results in the advantageous property of the stamp 10 of being able to continuously adapt to the increasingly narrowing nozzle channel. Preferably shaft 75, 77 and stem cushion 73 are made of the same material. The stamp 10 consists essentially of silicone, thermoplastic elastomer (TPE) or a combination thereof, for example.

The punch 10 shown here is suitable for pressing an intraocular lens 4 out of an injector with a narrowing nozzle channel 101, the lens body 41 with all haptics 43, 44 being pushed in front of the punch.

The punch 10 is placed on the ram 9 as shown in FIGS. 1, 3 and 5. Together they form a piston for pushing and thus ejecting a lens 4 from an injector. The punch 10 forms the piston tip. In Fig. 3 and Fig. 5, the spatial arrangement of the stamp 10 to the loading device 3 and thus in particular the La dekammer 36 is shown in detail. Similar to FIGS. 4 and 6, it can be seen in FIGS. 3 and 5 that the front or abutment side of the punch 10 is divided into two areas, in particular a first area 65 and a second area 67 . The first area is designed for a rear Hapük 44 of a lens 4, which lies in the open Ladenkam mer 36, ie in particular the free end 96 of the rear Hapük 44, forwards, ie in the direction of the nozzle and thus towards the lens body 41 push until the second area of the abutment surface 61, which protrudes further in the direction of impact of the plunger 9 than the first Area with which the rear haptic attachment 94 of the lens 4 comes into contact in order to push the lens 4 directly onto the haptic attachment 94 in the direction of the nozzle channel 101, essentially by means of pressure. The lens body 41 is thus pushed forward directly on the haptic attachment 94 by pressure and not by pressure on the free haptic 96 and thus on the optics 41, in that the free haptic 96 presses on the opük 41.

According to the invention, due to the abutment surface 61 equipped with two areas, on the one hand the position of the rear haptic 44 relative to the lens body 41 can be positively influenced before, on the other hand, the lens 4 is pushed against the haptic attachment 94 by pressure. A jamming, in particular of the rear haptic 44, can thereby advantageously be essentially prevented. When the rear haptic 44 or the easily movable part 96 of the rear haptic 44 is pushed forward, the haptic 44 is pushed forward or closer to the lens body and, if necessary, the haptic end 96 is oriented towards this. When the Linsenvor device 3 is closed or the lens 4 is folded, this has the effect that the rear haptic 44 remains in front of the abutment surface 61 of the stamp 10.

It has been found that in systems with a single-surface joint surface oriented at an angle to the direction of impact, the free end 96 of the rear haptic 44, which is movable with respect to the lens body by 41, gives way to the rear when the lens device 3 is closed and around the punch 10 or the ram tip winds. When the lens is injected into an eye, this leads to a high probability that the rear haptic will jam and possibly even tear off.

In order for the injection of the lens to be successful, the mutual position of lens and punch in the injector should advantageously be taken into account. Lens 4 and punch 10 are, so to speak, lined up one after the other in the injector on the impact axis. The lens is typically mounted in the loading device 3 in such a way that its optical axis is oriented perpendicular to the impact axis of the plunger 9. This applies equally in the unfolded as in the folded state. The separation between the two abutment surface areas 65 and 67, ie in particular the edge 69, of the punch 10 according to the invention is advantageously likewise oriented perpendicular to the abutment axis. Edge 69 and the optical axis of the lens 4 are thus both aligned perpendicular to the impact axis. Furthermore, lens 4 and stamp 10 in the injector are advantageously of this type aligned with one another so that the edge 69 of the abutting surface 61 and the optical axis of the lens are aligned essentially parallel to one another or are arranged with a certain deviation from the parallel alignment. It can be seen from FIGS. 3, 5 and 9 that a certain deviation from the essentially parallel alignment of the optical axis and edge 69 can be tolerated. The deviation can be in a range from 0 ° to 75 °, preferably 10 ° to 60 °, more preferably 20 ° to 55 °, more preferably 30 ° to 50 ° (degrees of angle). The deviation or the deviation angle from can in particular be described as a rotation about the impact direction, because a projection of the edge 69 in the impact direction onto the lens axis has the said deviation (in angular degrees).

Due to the mutual position of lens and punch described above, it is sufficient that the punch 10 with its abutment surface 61 is advantageously aligned with respect to the loading chamber 36 and the lens 4 positioned therein in such a way that the protruding second surface 67 essentially coincides with the advance its center meets the haptic attachment 94 of the rear haptic 44, while, in contrast, the first surface 65, remote from the haptic attachment, meets the movable part 96 of the rear haptic 44. In particular, the mutual alignment of lens 4 and die 10 is such that the second surface 67 preferably only meets the haptic extension 93, while the first surface 65 preferably hits the free end 96 of the rear haptic 44, but not its extension 94, meets. The term "hits" here means in particular that physical contact occurs when the punch is pushed forward.

In order to ensure the above-described advantageous mutual position between lens and stamp, guide structures can be contained in the loading device 3 and stamp 10 and / or the ram. For example, guide structures 49, 51 are formed in the loading chamber 36 parallel to the joint axis, FIGS. 3 and 5. These serve on the one hand as a holder for the lens when the loading device 3 is open and for guiding the lens 4 when the loading device 3 is closed the mentioned guide structures 49, 51 by interacting with the notch 71 formed in the punch 10 (FIGS. 3 and 4) to stabilize the punch 10 against rotation about the impact axis, so that a rotation of the punch around the impact axis is essentially avoided . It can be useful if a notch 71 described above is applied to the periphery of the punch where the abutment surface protrudes. That is to say, notch 71 and inclined surface 67 are placed on the same die half. Good guidance of the stamp can thus be achieved.

In particular, if the injector is an injector with a winged cartridge 3, it can be advantageous that the punch 10 and the threading device 3 are arranged in relation to one another in such a way that the second area, which is provided with the inclined surface 67 protruding distally, penetrates when it penetrates the closed thread chamber 36 slides along the closing side on the inside of the half-shells closed against one another in order to push the haptic attachment 93.

The peripheral contour of the stamp 10, in particular the peripheral edge 79 of the Stem pelkissens 73, is expediently adapted to the cross section of the closed Fadekam mer 36 or the fade channel, in particular so that when the fade chamber is closed, at least from the abutment surface, no cavities between the fade chamber wall and stamp 10 or between the Fadekammerwand and stamp pad 73 occur. Advantageously, the peripheral edge 79 of the stamp pad 73 in its non-compressed state corresponds to the cross-section of the thread chamber 36 or exceeds the cross-section of the thread chamber 36. In addition, the peripheral contour of the shaft 75, 77 in the non-compressed state is preferably smaller than that Cross-section of the closed thread chamber 36. It is further understood that the cross-section of the peripheral edge 79 of the stamp in the uncompressed state, in particular of the stamp pad 73 and preferably also of the stamp shaft, exceeds the cross-section of the nozzle opening 107. Overall, the circumferential shape at the punch head (ie at the distal end of the punch) essentially corresponds to the cross-sectional shape of the fading chamber in the closed position of the threading device 3. This serves to ensure that the fins bodies 41 and haptics 43, 44 are pushed in front of the punch 10 as far as possible (Details of the fin 4 are shown in Fig. 2). Fade chamber 36 and punch 10 or nozzle channel 101 and punch 10 are designed to match each other in their respective shape in such a way that the entire fin, ie including optics 41 and all of its one or more hooks 43, 44, when the punch 10 penetrates through the fade chamber 36 and nozzle channel 101 is pushed in front of the abutment surface 61 of the punch 10 without a haptic 43, in particular 44, can pass between the punch periphery and the loading chamber 36 or nozzle 11.

The stamp 10 is advantageously designed to be deformable, compressible and / or elastic, so that it can be pushed forward into the tapering nozzle channel 101 of the nozzle 11 in order to fully eject the lens 4, including its rear haptic 44.

Although the stamp 10 according to the invention is particularly suitable for loading devices with a folding mechanism according to WO2015070358, the positioning advantages of the stamp 10 according to the invention are also evident in other loading devices.

Advantageously, at the end of the loading chamber, in particular at the front end of the loading chamber, e.g. As shown in FIG. 9, a stopper 111 is integrated which, when the loading chamber 36 is open, blocks the passage from the loading chamber into the nozzle tip and gives way when the loading chamber is closed. The stopper 111 can give way in that it is automatically pushed out of the injection channel (e.g. as described in W02015070358) or - in a less convenient version on the part of the user - is removed manually. In any case, when the loading chamber is open, the stopper serves to push the optics of the lens against the front haptic 43 during the controlled advance of the lens by pressing the second surface 67 on the haptic attachment 94 of the rear haptic 44, which is then applied to the optic and is prevented from entering the nozzle channel 101 by the stopper 111.

The stopper 111 can, for example, as shown in WO2015070358, be formed on a holding element 113 which, in the open position of the loading chamber 36, spans it from wing attachment to wing attachment and (due to an articulated connection with the wing attachment of the first half-shell 13 and when lying loose on the wing approach of the second half-shell 15) when closing from the closing half-shells 13, 15 between the two wings 25, 27 slides. As a result, the stopper 111 (together with the holding element 113) can give way to the nozzle 11 when the open loading chamber 36 is closed. With regard to the implementation of a loading device with a stopper, reference is preferably made to the application WO2015070358, the content of which is hereby incorporated into this application. Depending on how the transition from the loading chamber to the nozzle or the narrowing nozzle wall is designed and / or the size dimensions of the nozzle wall is in relation to the design of the haptics of the lens used, a stopper may be dispensed with , as the side nozzle wall itself can take on a stopper function. The use of a stopper can, however, lead to an overall more reliable injector system in that, for a range of different lens designs, it reliably prevents a front haptic from being stretched into the loading channel when the loading chamber is closed.

In summary, the following can also be stated:

The punch, which so far (based on W02015 / 070358) on its joint surface was aligned completely flat and perpendicular to the joint direction, has been modified according to a preferred embodiment so that it runs roughly halfway in the joint direction and is flat in a first area is aligned perpendicular to the direction of impact and is about halfway, in a second area is inclined with a slope of about 45 °. This angle can vary, preferably by a maximum of ± 15 °, preferably a maximum of ± 10 °, more preferably a maximum of ± 5 °.

In particular, the following advantages result:

The incline of the stamp causes a mechanical stop for the lens haptics, which prevents rotation of the lens around its optical axis within the La dekammer by wedge formation. This is particularly relevant for the pre-loaded storage and transport of lenses. Due to the wedging, a certain type of lens is always positioned in the same way in the loading chamber, which means that, as expected, it always emerges in the same way when injected into an eye. This has the advantage that the operating surgeon always has to deal with the same exit situation and, accordingly, can achieve consistently good surgical results with a higher probability.

Due to the flat area of the stamp, the rear haptic is initially pressed slightly in the direction of the optics. This can be compared to one across the entire width oblique stamp prevents the rear haptics from getting caught between the loading chamber wall and the stamp when the loading chamber is closed.

Somewhat delayed, the incline also attacks the lower area of the Hapük and presses on the area of the haptics, which is firmly connected to the optics (approach or also called «Jimcüon»). By pressing on this junction area, the force is transmitted directly to the lens, which is pushed forward much more safely and in a more controlled manner. So far, a purely flat stamp has been used, which essentially presses against the loose part of the rear haptic. If this is quite elastic or if the lens sticks something to the surface of the loading chamber, then the rear haptic is only pressed against the optics (more than is actually intended) without pushing the optics itself. As a result, the anterior haptics (due to the lack of advancement of the lens body) are not placed against the opük as actually intended. If, however, the pressure point is set in the area of the junction, which is achieved by the incline, this cannot happen.

The slope of the punch has approximately the same orientation and slope as the slope of the nozzle opening. This has the advantage that the punch therefore reaches the end of the long side of the nozzle opening at the same time as the end of the short side. A flat stamp, on the other hand, already emerges on the short (lower) side if it has not yet reached the end of the longer (upper) side.

There are a large number of patents which have a non-planar piston tip (for example EP 1'832'247 B1, US 6'733'507 B2, US 6W520 B1, EP 0'877'587 B1). However, these stamps always serve to grasp the lens body like a shovel so that the piston does not run over the lens. These stamps grip like a shovel under the lens body, wel cher is gripped in its flat extent by the blade surface. A pushing of the lens without the rear haptic being pushed against the lens body in an uncontrolled manner is therefore not achieved in each case. The incline of the invention described herein does not attack, as in the aforementioned documents under the optics of the lens, but rather laterally on the lens or lens edge. While specific embodiments have been described above, it is obvious that different combinations of the possible embodiments shown can be used, provided that the possible embodiments are not mutually exclusive. While the invention has been described above with reference to specific embodiments, it is apparent that changes, modifications, variations and combinations can be made without departing from the spirit of the invention.

REFERENCE LIST

1 injector housing or housing

2 piston gear

3 loading device, especially e.g. designed as a cartridge

4 lens (especially with optical body and haptics)

5 front face (or front end) of the cartridge

7 rear face (or rear or end remote from the nozzle) of the cartridge

9 tappets (also called pistons)

10 stamps

11 Injection cannula or nozzle

13 first half-shell

15 second half-shell

17 first inner surface, i.e. Inner surface of the first half-shell

19 second inner surface, i.e. Inner surface of the second half-shell

21 longitudinal edge of the loading area on the first half-shell, i.e. first longitudinal edge

23 longitudinal edge of the loading area on the second half-shell, i.e. second long edge

25 first wing

27 second wing

29 first joint, in particular film hinge

36 loading chamber

41 optical lens body, also called lens body or optics

43 front haptics

44 rear feel first edge strip, ie edge strip on the longitudinal edge of the first half shell

second sidebar, i.e. Edge strip on the longitudinal edge of the second half-shell, also called a guide rail

Connector

Plunger end (piston end), especially shaped as a push handle

proximal (rear) end of the punch

distal (front) end of the punch, i.e. Stamp front

Impact surface

Plug-in structure

perpendicular surface (or possibly called first surface)

inclined surface (or possibly called second surface)

Edge (especially also referred to as inner edge, negative edge or groove) notch

Ink pad

Shank, in particular a shank widening towards the distal end of the punch, shank, in particular a cylindrical shank for fixing to a ram, peripheral contour of the punch pad

Approach of the front haptics, which connects the front haptics with the optical lens body

Approach of the rear haptics, which connects the rear haptics with the optical lens body

End (tip) of the front haptic, in particular the free end of the front haptic

End (tip) of the rear haptic, in particular the free end of the rear haptic Nozzle channel or discharge channel

Nozzle tip or nozzle outlet or nozzle opening counter handle

stopper

Retaining element

Claims

EXPECTATIONS

1. Stamp (10) of an injector for an intraocular lens suitable for ejecting a lens from the injector, the stamp being deformable or compressible in order to be able to continuously adapt to the increasingly narrowing nozzle channel, the stamp comprising a proximal end (57 ) and a distal end (59), the proximal end (57) and the distal end (59) defining an impact axis and an impact direction and the distal end (59) forming an impact surface (61) on the punch face, while the distal end (57 ) serves or is designed for fastening to a plunger tip or is designed as a plunger (9) itself, characterized in that

that the joint surface (61)

- has in a first region a first surface (65) which is oriented essentially perpendicularly with respect to the impact axis and extends to the peripheral edge of the impact surface (61), and

- In a second area, a second surface that is inclined with respect to the joint axis

(67) which extends to the peripheral edge of the abutment surface (61) and protrudes distally.

2. Stamp (10) according to the preceding claim, characterized in that the first surface (65) and the second surface (67) are inclined towards one another at an obtuse angle.

3. stamp (10) according to claim 2, characterized in that the obtuse angle is 135 ° ± 30 °, preferably 135 ° ± 20 °, preferably 135 ° ± 10 °, more preferably 135 ° ± 5 °.

4. Stamp (10) according to one of the preceding claims, characterized in that the first surface (65) and second surface (67) meet and jointly form an edge (69).

5. Stamp (10) according to one of the preceding claims, characterized in that it has a notch (71) which runs on the periphery of the stamp (10) and preferably protrudes from the periphery into the second surface (65).

6. Stamp (10) according to at least the preceding claims 4 and 5, characterized in that the notch (71) runs perpendicular to the edge (69) (i.e. parallel to the direction of impact), preferably without breaking through the edge (69).

7. Stamp (10) according to one of the preceding claims, characterized in that between the distal end (59) and the proximal end (57) from the distal end (59) to the proximal end (57) a first, tapering stamp shaft ( 75) extends.

8. The stamp (10) according to claim 7, characterized in that a second, preferably substantially straight shaft part (77) is formed on the tapering stamp shaft (75) towards the proximal end (57).

9. Stamp (10) according to one of claims 7 or 8, characterized in that the distal end is designed as a stamp pad (73), which is characterized in that it has a periphery that is wider than the periphery of the shaft (75, 77) of the stamp.

10. stamp (10) according to one of the preceding claims, characterized in that it consists essentially of an elastic material or is manufactured.

11. Stamp (10) according to one of the preceding claims, characterized in that it consists or is made essentially of silicone, thermoplastic elastomer (TPE) or a combination thereof.

12. Stamp (10) according to one of the preceding claims, characterized in that the first surface (65) directly adjoins the second surface (67), preferably so that the two surfaces added together form the entire joint surface (61).

13. Stamp (10) according to one of the preceding claims, characterized in that the stamp has a mirror plane in which the impact axis lies, and preferably that the maximum surface length - measured in the respective surface in a line parallel to the mirror plane - in second area (or in the second area (67)) is larger than in the first area (in the first area (65)).

14. Injector for intraocular lenses, comprising

- an elongated injector housing (1) with a longitudinally directed piston path (2),

- A nozzle (11) which is attached distally to the housing (1), with a distal nozzle opening (107) and a nozzle channel (101) narrowing towards the distal nozzle opening (107) in an axial extension of the piston duct (2),

- A plunger (9) which is longitudinally displaceable in the piston passage (2), is mounted defining a thrust axis and can be pushed towards the nozzle opening (107), a deformable or compressible punch (10) being formed on the plunger (9) the distal end of which forms an abutment surface (61),

- A loading device (3) with a loading chamber (36) for an interocular lens, the loading device (3) being provided in a recess (4) of the housing (1) between the piston duct (2) and nozzle channel (101) of the nozzle (11) and is designed in such a way that the loading chamber (36) can be pierced by means of the plunger (9) for the purpose of ejecting a lens (4), so that a lens, which is contained in the loading device (3), is removed from the loading chamber (36) and can subsequently be ejected through the nozzle channel (101),

characterized in that

- The abutment surface (61) of the punch (10) has a first area (65) in a first area (65) which is essentially perpendicular to the abutment axis and extends to the peripheral edge of the abutment area, and in a second area (67 ) has a second surface (67) which is inclined with respect to the impact axis and which extends to the peripheral edge of the impact surface and protrudes distally, wherein

- The first area (65) of the abutment surface (61) is designed to push a rear haptic (44) of a lens located in the loading chamber (36) forward, and the second area (67) of the abutment surface ( 61), which protrudes further in the direction of impact than the first region (65), is designed to come into contact with the haptic attachment (93) of the lens in order to press the haptic attachment (93) into the loading chamber (36). Push towards the nozzle channel (101).

15. Injector according to claim 14, characterized in that

- The abutment surface (61) is oriented in relation to the loading chamber (36) and the lens positioned therein in such a way that the protruding second area (67) essentially has its center on the haptic attachment (93) of the rear haptic (44) when it is pushed forward ), while in contrast to this, the first area (65) meets the haptic attachment and the rear haptic (44).

16. Injector according to one of the preceding claims 14-15, characterized in that the end face of the stamp (10) is designed as a stamp pad (73), which is characterized in that it is placed on a stamp shaft (75, 77) Has periphery that is wider than the periphery of the shaft (75,

77).

17. Injector according to one of the preceding claims 14-16, characterized in that the peripheral contour of the stamp (10), in particular the peripheral edge (79) of the stamp pad (73), is adapted to the cross section of the loading chamber (36) is, so that when the loading chamber is closed, at least from the impact surface

(61), there are no cavities between the loading chamber wall and the stamp (10) or in particular between the loading chamber wall and the stamp pad (73).

18. Injector according to the preceding claim 17, characterized in that the peripheral edge (79) of the stamp pad (73) corresponds to the cross section of the charging chamber (36) or exceeds this in the uncompressed state and preferably exceeds the peripheral contour of the shaft (75 , 77) in the uncompressed state is smaller than the cross-section of the loading chamber.

19. Injector according to one of the preceding claims 14-18, stamp (10), characterized in that the cross section of the peripheral edge (79) of the stamp, in particular of the stamp pad (73) and preferably also of the stamp shaft, in the uncompressed state Cross section of the nozzle opening (107) increases.

20. Injector according to one of the preceding claims 14-19, characterized in that in the loading chamber (36) joint-axis-parallel guide structures (49, 51) are formed for the lens, which with a notch (71) of the stamp (10) _Z usammenwirken that the plunger is guided at its piercing through the loading chamber (36) by the guide structure.

21. Injector according to one of claims 14-20, characterized in that the first surface (65) and the second surface (67) of the punch (10) are inclined towards one another at an obtuse angle.

22. Injector according to claim 21, characterized in that the obtuse angle is 135 ° ± 30 °, preferably 135 ° ± 20 °, preferably 135 ° ± 10 °, more preferably 135 ° ± 5 °.

23. Injector according to one of claims 14-22, characterized in that the first surface (65) and second surface (67) meet and together form an edge (69). 24. Injector according to the preceding claim 23, characterized in that the edge (69) of the abutment surface (61) of the stamp (10) and the optical axis of the lens (4) are aligned essentially parallel to one another or with a certain deviation from the parallel Alignment, preferably with a deviation in a range from 0 ° to 75 °, preferably 10 ° to 60 °, more preferably 20 ° to 55 °, more preferably 30 ° to 50 ° (degrees of angle).

25. Injector according to one of the preceding claims 14-24, characterized in that the stamp (10) has a notch (71) which runs on the periphery of the stamp (10) and preferably from the periphery into the second surface ( 65) protrudes. 26. Injector according to claim 25, characterized in that the notch (71) in the

Stamp (10) perpendicular to the edge (69) (ie parallel to the impact direction) runs ver, preferably without breaking through the edge (69).

27. Injector according to one of claims 24-26, characterized in that between the distal end (59) and proximal end (57) from the distal end (59) to the proximal end (57) a first, tapering punch shaft (75) he stretches. 28. Injector according to claim 27, characterized in that the tapering

A second, preferably essentially straight, shaft part (77) is integrally formed on the stamp shaft (75) towards the proximal end (57).

29. Injector according to one of the preceding claims 14-28, characterized in that the punch (10) consists or is made of an elastic material.

30. Injector according to one of the preceding claims 14-29, comprising an interocular lens, which can be preloaded in the loading device (3), where the interocular lens is preferably a lens with two haptics, which in the plane of extension of the Lenses on the lens body are arranged diametrically to one another and in the plane of extent of the lens protrude in the same direction from the lens body in a spiral shape.