FR2863872A1 - Disposable ophthalmic microsurgical forceps for cataract surgery, comprises gripping part molded by single part, pinching part made of metal tips inserted during molding of gripping part in distal ends of arms, and pre-centering units - Google Patents

Abstract

The disposable ophthalmic microsurgical forceps comprises a gripping part (1) molded by a single part that is made of plastic material and consists of two arms connected each other by one of their ends to form a proximal end of the forceps, a pinching part (2) made of metal tips (2A, 2B) inserted during molding of the gripping part in distal ends of the arms to form two branches of the forceps, and pre-centering units. The distal part of the forceps is provided with centering units, which comprise a male part that is formed by a pin or finger (3). The disposable ophthalmic microsurgical forceps comprises a gripping part (1) molded by a single part that is made of plastic material and consists of two arms connected each other by one of their ends to form a proximal end of the forceps, a pinching part (2) made of metal tips (2A, 2B) inserted during molding of the gripping part in distal ends of the arms to form two branches of the forceps, and pre-centering units. The distal part of the forceps is provided with centering units, which comprise a male part that is formed by a pin or finger (3) to form cylinder that is fixed to one of arms and oriented towards the other arm and a female part constituted by a transfixing opening (4) provided in the arm with respect to the male part. The centering units are provided in the end portions of plastic arms in which the proximal portions of metallic pinching point are inserted. The centering opening transfixes or crosses the plastic part and the part of the metal tip embedded in the plastic material. The transfixing opening has an oblong shape of which a major axis is parallel to an axis of the arms provided with the opening. The pre-centering units comprise a male part consisting of a pin that is fixed to one of branches of the forceps and oriented toward the other arm, and a female part consisting of a transfixing opening. The pre-centering units are arranged away from the centering units in the direction of the proximal end of the forceps. The arrangement of male and female elements of centering units and pre-centering units on the arms of the forceps is reversed. The pin and transfixing opening of pre-centering units have: an oval shape of which a main axis is oriented perpendicular to the axes of arms provided with tenon and the opening respectively; and volumes greater than that of a pivot and a centering hole respectively. In the area of gripping or finger pressure of the arm, an inner face of the plastic arms is provided, where the trust bearings are oriented towards the inner face of the other arm. The finger and/or pre-centering pin comprise a circular shoulder at their base and the centering and/or pre-centering opening are bordered by a collar, where the shoulders and collars are contacted with each other in the pinching position to constitute the thrust bearing while joining the arms of the forceps. The thrust bearings restrict the movement of connecting arms, and are distributed over the entire length of a gripping zone of the forceps.

Description

Surgical forceps, in particular microsurgical forceps

ophthalmology.

  The present invention relates to a surgical forceps, in particular an ophthalmological microsurgery forceps, for single use, more specifically dedicated to cataract surgery.

  More specifically, the invention relates to a disposable ocular microsurgical clamp of the kind comprising two branches connected to one another by one of their ends to form the proximal gripping portion of the clamp and whose opposite ends are constituted by pinch points capable of being elastically brought closer to each other and constituting the active distal portion of said clamp.

  Cataract surgery is currently the most common surgical procedure in the world. This intervention requires a series of instruments including microsurgical clamps of the kind mentioned above, with extremely fine pinch points which, in use, must be brought strictly facing one another.

  Currently, these instruments of high precision are most often made of a hard metal and stainless, in a traditional and manual way, which makes them very expensive.

  Such clips are, for example, described in documents FR-2.644. 689 and FR-2.491.325, the latter explaining the reasons for the necessarily very expensive nature of these instruments.

  The high cost of manufacture is a major obstacle to these instruments being offered as "disposable" instruments, while their non-reuse would be health and economically desirable. In fact, the sterilization and / or the compulsory decontamination of reusable surgical instruments and their preservation in sanitized state, between two successive uses, impose important investments in qualified personnel, equipment and working time. On the other hand, these instruments become unusable as soon as their tips are somewhat deformed or blunted and no longer have the necessary accuracy of operation.

  To lower the cost price of these instruments so as to make them single-use items, it is necessary to mechanize their production.

  WO-03/04509 discloses a disposable surgical forceps entirely made by pressure molding a thermoplastic material and being in the form of a single piece.

  The idea of making the ocular microsurgical clamps of thermoformed plastic material may seem very attractive from the outset, because of the economic nature of this mode of production. However, practitioners have found that if this material is suitable for the manufacture of the sleeves or proximal parts of the branches of the instruments, it does not have the necessary physical characteristics of fineness and hardness specific to the metal, in the active distal part (spikes). pinching of the branches) of said instruments.

  To overcome the aforementioned drawbacks of surgical instruments made entirely of metal or surgical instruments completely made of plastic material, it has already been proposed to produce some of these instruments with an active metal part overmoulded by a plastic material injected under pressure (for example: US -2003/0109858, EP-1,262,157, WO-98/22035).

  Document WO-98/22035 very briefly describes a kind of disposable surgical clip comprising two branches provided with metal tips consisting of overmolded inserts.

  Thanks to such a method of manufacture, it is possible to produce surgical instruments in a more economical manner making it possible to reserve them for a single use.

  However, the flexibility of the plastics which can be used for the manufacture of ocular microsurgical clips raises problems which the present invention proposes to solve.

  The main problem lies in the fact that, for the all-metal clamps, the rigidity of the metal allows a perfect alignment of the distal ends formed by the pinch points of the arms of the clamps, at their approximation, without it is necessary to set up a particular centering device, the flexibility of the sleeves or proximal portions of said branches, when made of plastic material, does not guarantee such perfect alignment during use.

  According to the invention, this problem is solved by a composite surgical clip of the kind comprising, on the one hand, a molded gripping part made of a single plastic part and consisting of two arms connected to each other by one end thereof to form the proximal end of the forceps and, on the other hand, a nip portion formed by metal tips inserted during molding of said gripping portion into the distal ends of said arms, so that to form the two branches of said clamp, which is remarkable in that the active distal portion of this clamp is provided with centering means comprising, on the one hand, a male part, preferably constituted by a pin or cylindrical finger secured to one of the branches of the clamp and oriented towards the other branch, and, secondly, a female portion constituted by a transfixing orifice formed in said other branch, facing the said male part, these centering means being provided in the end portions of the plastic sleeves in which are implanted the proximal portions of the metal pinch points, so that said centering hole transfixes or passes through not only the plastics material but also the portion of the metal tip inserted in said plastic material.

  With this arrangement, the active ends of the metal pinch points of the clamp can be brought closer to being in contact with one another, with great precision.

  The port transfixing both the plastic and the metal part makes it possible to locate the centering means as low as possible on the branches of the clamp and therefore as close as possible to the pinch points of the latter.

  On the other hand, the provision of this transfixiant orifice makes it possible to obtain the two arms of the clamp in a single molding operation.

  According to a preferred embodiment, the clamp is also provided with pre-centering means comprising, on the one hand, a male part, for example constituted by a tenon integral with one of the branches of the clamp and oriented in the direction of the other branch and, secondly, a female portion constituted by a transfixiant orifice that has the other branch, facing said male part.

  These pre-centering means are arranged at a short distance (for example at a distance of the order of 11.1 mm) from the centering means described above, in the direction of the proximal end of the clamp.

  Advantageously, the pin and the pre-centering transfixing orifice have an oblong shape whose major axis is oriented perpendicular to the axis of the branch.

  The post and the pre-centering orifice have a larger volume than that of the lug and the centering hole.

  When the branches of the clamp are brought together, the pre-centering means enter the first ones in action, which allows a sufficient confrontation of said branches so that the centering means can then perfectly fulfill their function.

  Another problem encountered with the use of composite surgical forceps of the above-mentioned kind, because of the flexibility of the plastic material constituting the arms of the clamp, is that, when the active ends of the metal tips are squeezed, the against each other, the pressure exerted on said arms by the practitioner's fingers may be greater than necessary, which has the effect of creating a leverage effect on a fulcrum situated between the zone of pressure of the fingers and said active ends (for example constituted by the centraliser, or even by the metal platform of said points) causing a slight spacing of the latter, that is to say a result exactly opposite the desired pinching effect.

  According to another characteristic arrangement of the invention, this problem is solved by the prediction, on the internal face of at least one of the two plastic arms and at least in the grip zone of the clamp, of one or several stops oriented towards the inner face of the other arm.

  According to a preferred embodiment, cooperating abutments are arranged facing each other on the inner face of each plastic sleeve of the clamp.

  These stops effectively oppose an undesirable approximation of the handles of the clamp beyond their movement allowing the pinch points of said clamp to come into contact with each other, even in case of excessive pressure applied by the fingers of the practitioner, during the operation. On the other hand, the provision of a plurality of spaced cooperating abutments distributed in the gripping area of the clamp contributes to the proper mutual positioning of the arms of the latter, in the pinch position.

  The above and other objects, features and advantages will become more apparent from the following description and accompanying drawings, in which: FIG. 1 is a perspective view of an exemplary embodiment of a microsurgical clamp ocular executed according to the invention.

  Figure 2 is a perspective view and on a larger scale of the distal portion of this clamp.

  Figure 3 is an elevational view and front of the clamp.

  Figures 4 and 5 are side views showing opposite side faces of the clip.

  Figure 6 is a longitudinal sectional view of the clamp shown in the rest position.

  Figure 7 is a longitudinal sectional view showing the approximation of the active tips of the clamp, in the pinch position.

  Figures 8 and 9 are sectional views, on an enlarged scale, along lines 8-8 and 9-9, respectively, of Figure 3.

  Figures 10 and 11 are partial views showing the inner faces of the distal portions of the two branches of the clamp.

  Referring to said drawings to describe an advantageous embodiment, although not limiting, a surgical clip according to the invention which, according to this example is constituted by one of the ocular microsurgery clamps used in the cataract operative process .

  The clamp to which the invention refers is of the kind comprising two branches connected to one another, at one of their ends to form the proximal portion of the clamp and the opposite ends of which are constituted by spikes. pinching may be brought closer elastically to one another and constituting the active distal portion of said clamp.

  The gripper according to the invention is a composite gripper whose manual gripping portion is made of a rigid and flexible plastic such as Zylar (Registered Trademark), Terpolimers (ABS), Polycarbonates (PC), and whose pinch portion is made in a hard and unalterable metal such as titanium stainless steel or other.

  This composite clip is made in one piece, overmolding its metal nip portions with any plastic material having the required hardness and flexibility characteristics, by any suitable pressure injection method.

  In this way, the manufacture of metal pinch points in a metal having the desired hardness can be mechanized and automated, and the clamps can be obtained in a single injection operation, which allows a very economical production of the latter and their reservation for a single use.

  The clamps thus produced comprise: on the one hand, a gripping portion 1 made of plastic material and consisting of two arms 1A, 1B connected to one another by one of their ends to form the proximal end of the clamp and extending from their junction forming an acute angle, for example of the order of 6 to 7, and, secondly, a clamping portion 2 constituted by metal tips 2A, 2B implanted in the distal ends of said arms.

  The arms 1A, 1B can be brought closer elastically to one another because of the flexibility of the material in which they are executed, so as to bring the active ends 2A ', 2B' pinch points 2A, 2B, respectively, in contact with each other.

  The distal portion of the clamp thus produced is provided with centering means for guiding the active ends 2A ', 2B' of the pinch points 2A, 2B during their displacement towards one another.

  According to a first characteristic arrangement of the invention, these centering means comprise, on the one hand, a male part, preferably constituted by a pivot 3 of cylindrical shape formed in one piece with the 1B of the arms made of material plastic of the clamp and oriented towards the other arm 1A thereof and, secondly, a female part consisting of a transfixing orifice 4 of oblong shape, formed in the arm 1A, facing said pin or finger 3. This orifice has an oblong shape whose major axis is parallel to the axis AA of the arm 1A provided with said orifice (Figure 11).

  The pivot 3 and the orifice 4 are arranged in the end portions of the plastic arms in which the proximal portions of the metallic nibs 2B and 2A are embedded, respectively, so that said centering orifice 4 transfixes or crosses not only the plastic but also the portion 2A "of the pinch metal tip 2A inserted in said plastic material.

  According to another very advantageous characteristic arrangement of the invention, the clamp is also provided with pre-centering means comprising, on the one hand, a male part, preferably constituted by a tenon 5 formed in one piece with the one of the arms of the clamp and oriented towards the other arm and, secondly, a female portion constituted by a transfixing orifice 6 that has the other arm, facing said male part.

  These pre-centering means 5, 6 are arranged at a short distance from the centering means 3, 4, in the direction of the junction end of the arms 1A, 1B of the clamp.

  According to a preferred embodiment, the post 5 and the pre-centering transfixing orifice 6 have an oblong shape, for example approximately oval, the major axis of which is oriented perpendicularly to the axes AA and A'-A 'of the arms 1A. and 1B provided with said pin and said orifice, respectively (Figure 10). On the other hand, the post 5 and the pre-centering orifice 6 have larger volumes than those of the pivot 3 and the centering hole 4, respectively.

  The arrangement of the male and female constituent elements of the centering means 3, 4 and the pre-centering means 5, 6 on the arms 1A and 1B is preferably reversed, that is to say that the centering pivot 3 is provided on the arm 1B while the pre-centering pin 5 is disposed on the arm 1A.

  According to another characteristic arrangement of the invention, the internal face of at least one of the arms 1A, 1B made of plastics material, is provided, at least in the gripping zone or digital pressure P of said arms, with a or, preferably, several stops 7, oriented towards the inner face of the other arm 1B, 1A, so as to limit the amplitude of the necessary movement of said arms to bring the active ends 2A ', 2B' of the tips of pinching in contact with each other.

  For example, the inner face of at least one of the arms may be provided with two spaced stops 7 constituted by cylindrical lugs oriented toward the inner face of the other arm. Alternatively, the inner face of at least one of the arms could be provided with a single stop of great length for example covering most of the length of the gripping zone of the latter.

  According to a preferred embodiment, cooperating abutments 7A ', 7B' and 7A ", 7B" are arranged facing each other on the inner face of each plastic arm 1A, 1B, between the centering means 5 or 6 and the joining ends of said arms.

  These stops are dimensioned so that when a closing force is applied in the gripping zone P of the arms 1A, 1B, the abutments 7A ', 7A "of the arm 1A are pressed against the abutments 7B', 7B" of the arm 1B, as soon as the active ends 2A ', 2B' of the contact points come into contact with each other.

  It is understood that with this stop system, no excessive pressure may cause decentration of the active ends 2A ', 2B', in use can not be communicated to them.

  Interestingly, as shown in Figures 8 and 9, the centering orifices 4 and / or pre-centering 6 are bordered by a flange, respectively 4 'and 6', projecting on the inner face of the arms 1A and 1B .

  On the other hand, the centering finger 3 and / or the pre-centering pin 5 comprise, at their base, a circular shoulder 3 'and 5', respectively.

  These flanges 4 'and 6' and these circular shoulders 3 'and 5' perform a function comparable to that of the abutments 7A ', 7B', 7A "and 7B", when the pre-centering pin 5 and the centering pin 3 are engaged in the pre-centering orifices 6 and centering holes 4.

  When the branches 1A-2A and 1B-2B are brought closer to the clamp, the abutments 7A ', 7A ", the shoulder 5' and the flange 4 'of the arm 1A come into contact with the abutments 7B', 7B", the flange 6 'and the shoulder 3' of the arm 1B, respectively, which stops the movement of said branches towards each other in the desired clamping position of the active ends 2A ', 2B' of the pinch points 2A, 2B by eliminating any possibility of pinching too strong regardless of the force of the pressure applied by the practitioner.

  The different stops 7A'-7B ', 7A "-7B", 5'-6', 3'-4 ', are distributed over the entire length of the gripping zone of the clamp, so that there is no no possibility of tilting of one of the branches around a fixed point of support, in case of excessive pressure on said branches.

  A particular type of ocular microsurgical forceps used in the cataract surgery procedure has been described and illustrated for the presentation of the invention, but it is evident that the invention is not limited to this type of forceps. It applies to all clamps used for the execution of the aforementioned operation and generally to all microsurgical clamps of comparable architecture for which there is the need for disposable instrumentation such as forceps plastic, vascular, restorative, dental and other microsurgery.

Claims (10)

-11-CLAIMS   1. Surgical forceps, in particular an ophthalmological microsurgery forceps, of the kind comprising, on the one hand, a gripping portion (1) molded in one piece of plastic and consisting of two arms (1A, 1B) connected to the to one another at one of their ends to form the proximal end of the clamp and, secondly, a nip portion (2) constituted by metal tips (2A, 2B) inserted during the molding of said gripping portion, in the distal ends of said arms, so as to form the two branches of said clamp, characterized in that the distal portion of said clamp is provided with centering means comprising, on the one hand, a male part, preferably constituted by a lug or finger (3) of cylindrical shape secured to one of the branches of the clamp and oriented towards the other branch, and, secondly, a female portion constituted by a transfixing orifice ( 4) provided in said other branch , facing said male part, these centering means being provided in the end portions of the plastic arms (1A, 1B) in which the proximal portions (2A ", 2B") of the metallic pinch points are inserted , so that said centering hole (4) transfixes or passes through not only the plastic but also the portion (2A ") of the metal tip (2A) embedded in said plastic material.   2. Surgical forceps, in particular ophthalmological microsurgery clip, according to claim 1, characterized in that the transfixing orifice (4) has an oblong shape whose major axis is parallel to the axis (AA) of the arm (1A). provided with said orifice (4).   3. Surgical forceps, in particular ophthalmological microsurgery clip, according to one of claims 1 or 2, characterized in that it is provided with pre-centering means comprising, on the one hand, a male part, for example constituted by a tenon (5) secured to one of the branches of the clamp and oriented towards the other branch and, on the other hand, a female portion constituted by a transfixiant orifice (6) that the other branch has, - 12 - facing said male part, these pre-centering means (5,6) being arranged at a distance from the centering means (3,4), in the direction of the proximal end of the clamp.   Surgical forceps, in particular an ophthalmological microsurgery clip, according to claim 3, characterized in that the arrangement of the male and female constituent elements of the centering means (3,4) and the pre-centering means (5,6). on the branches (1A2A, 1B-2B) of the clamp, is reversed.   5. Surgical forceps, in particular ophthalmological microsurgery forceps, according to one of claims 3 or 4, characterized in that the pin (5) and the pre-centering transfixing orifice (6) have an oblong shape, for example an approximately oval shape, whose major axis is oriented perpendicularly to the axes (AA, A'-A ') of the arms (1A, 1B) provided with said pin and said orifice, respectively.   6. Surgical forceps, in particular ophthalmological microsurgical clamp, according to any one of claims 3 to 5, characterized in that the post (5) and the pre-centering orifice (6) have larger volumes than those of the pivot (3) and the centering hole (4), respectively.   7. Surgical forceps, in particular microsurgical forceps, according to any one of claims 1 to 6, characterized in that the inner face of at least one of the plastic arms (1A, 1B) is provided with, at least in the area of gripping or digital pressure (P) of said arms, one or more stops (7) oriented (s) towards the inner face of the other arm (1B, 1A).   8. Surgical forceps, in particular ophthalmological microsurgery clip, according to claim 7, characterized in that the inner face of each plastic arm (1A, 1B) is provided with spaced cooperating abutments (7A ', 7B' and 7A " , 7B ") arranged facing each other, between the pre-centering means (5, 6) and the junction ends of said arms.   9. Surgical forceps, in particular ophthalmological microsurgery pliers, according to one of claims 7 or 8, characterized in that the centering finger (3) and / or the pre-centering pin (5) comprise, at their base, a circular shoulder (3 ', 5'), and in that the centering orifices (4) and / or pre-centering (6) are bordered by a flange (4 ', 6'), these shoulders and these collars coming into contact with each other in the pinch position, so as to form stops when bringing the branches of the clamp.   10. Surgical forceps, in particular ophthalmological microsurgery clip, according to any one of claims 7 to 9, characterized in that the stops (7A'-7B ', 7A "-7B", 5'-6', 3 ' -4 ') limiting the movement of movement of the arms (1A, 1B), are distributed over the entire length of the gripping zone (P) of the clamp.