Manual syringe with double gripping wings

Abstract

The invention relates to a manual syringe comprising: - a syringe body (1); - a plunger rod (2) slidably mounted inside the syringe body (1); - a stopper (3) arranged at a first end (20) of the plunger rod (2); - a manual pusher (4) arranged at a second end (21) of the plunger rod (2); wherein the syringe body (1) has: a distal portion (10) relative to the manual pusher (4); a proximal portion (11) relative to the manual pusher (4), opposite the distal portion (10) and provided with gripping wings (5) defining a gripping position; characterised in that the proximal portion (11) of the syringe body (1) relative to the manual pusher (4) is provided with additional gripping wings (6) arranged at a distance from the gripping wings (5) in the direction of product injection, so as to define an additional gripping position.

Description

[0001] MANUAL SYRINGE WITH DOUBLE GRIPPING WINGS

[0002] Technical field

[0003] The invention relates to the technical field of manual syringes, that is to say syringes comprising a pusher on which injection pressure is manually exerted by a health professional.

[0004] The invention finds its application in particular in the injection of viscoelastic gels (e.g. based on hyaluronic acid), for example in the field of anti-aging and medical aesthetics.

[0005] State of the art

[0006] A manual syringe known from the state of the art comprises:

[0007] - a syringe body, intended to receive a product to be injected;

[0008] - a piston rod, slidably mounted inside the syringe body in one direction of injection of the product and in an opposite direction, and having first and second opposite ends;

[0009] - a stopper, arranged at the first end of the piston rod;

[0010] - a manual pusher, arranged at the second end of the piston rod, and on which an injection pressure is manually exerted suitable for injecting the product; the syringe body having: a part distal to the manual pusher, intended to be equipped with a needle holder; a part proximal to the manual pusher, opposite the distal part, and provided with gripping fins defining a gripping position.

[0011] Such a prior art manual syringe is not entirely satisfactory in the case where the product to be injected requires significant pressure to be exerted on the pusher. This is particularly the case when the product to be injected is a viscoelastic gel based on hyaluronic acid, where it is sometimes necessary to apply a force greater than 50 N. The health professional (e.g. doctor) is therefore likely to experience some discomfort, or even pain, when repeatedly using such a prior art manual syringe.

[0012] To this end, at constant volume, the manual syringe can be designed to lengthen and refine the syringe body and the plunger rod in order to reduce the contact surface with the product to be injected, and thereby reduce the force required to inject the product. However, the lengthening and refinement of the plunger rod also leads to discomfort for the healthcare professional. This discomfort in gripping the syringe is particularly evident at the start of the injection, when the second end of the plunger rod (where the manual pusher is arranged) is located at a significant distance from the gripping fins.

[0013] In addition, the gripping wings are digital gripping wings, intended for a pincer grip. At least two fingers of the hand (except the thumb), generally the index and middle fingers, grasp the gripping wings while the thumb (or palm of the hand) exerts counter-pressure on the manual pusher in order to inject the product. As the injection progresses, the healthcare professional's hand gradually closes, that is to say, the thumb (or palm) gradually moves closer to the fingers of the hand that grasp the gripping wings. The variation in the distance separating the thumb (or palm) and the fingers of the hand in the gripping position, hereinafter referred to as the separation distance, can be significant between the start of the injection and the end of the injection. This variation in the separation distance is all the greater as the syringe body is long.However, it has been found that a significant variation in the separation distance is likely to lead to injection irregularities, particularly at the end of the injection. These injection irregularities can be detrimental for certain procedures for aesthetic and / or medical purposes. As a non-limiting example, an injection at the level of a patient's wrinkles requires excellent regularity and stability in order to obtain the desired precision (which may be of the order of ± 1 mm) and reach the patient's wrinkles effectively and safely.

[0014] The person skilled in the art is therefore looking for a manual syringe that can reduce the discomfort of the healthcare professional at the start of the injection and / or reduce injection irregularities at the end of the injection.

[0015] Statement of the invention

[0016] The invention aims to remedy all or part of the aforementioned drawbacks. To this end, the invention relates to a manual syringe, comprising:

[0017] - a syringe body, intended to receive a product to be injected;

[0018] - a piston rod, slidably mounted inside the syringe body in one direction of injection of the product and in an opposite direction, and having first and second opposite ends;

[0019] - a stopper, arranged at the first end of the piston rod;

[0020] - a manual pusher, arranged at the second end of the piston rod, and on which an injection pressure is manually exerted suitable for injecting the product; the syringe body having: a part distal to the manual pusher, intended to be equipped with a needle holder; a part proximal to the manual pusher, opposite the distal part, and provided with gripping fins defining a gripping position; remarkable in that the part proximal to the manual pusher of the syringe body is provided with additional gripping fins, arranged at a distance from the gripping fins towards the direction of injection of the product, so as to define an additional gripping position.

[0021] Thus, such a manual syringe according to the invention makes it possible to reduce the discomfort of the healthcare professional at the start of the injection and to reduce injection irregularities at the end of the injection, compared to the state of the art, thanks to such additional gripping wings. The first assembly, comprising the manual pusher and the gripping wings, allows a first digital grip of the pincer grip type, used at the start of the injection. The second assembly, comprising the manual pusher and the additional gripping wings, allows a second digital grip of the pincer grip type, used at the end of the injection. Such additional gripping wings make it possible to reduce the amplitude of the variation in the separation distance compared to the state of the art during the entire injection, which improves the comfort of the healthcare professional and the precision of the procedure.As defined previously, the separation distance is the distance separating the thumb (or palm) positioned on the pusher, and the fingers of the hand (except the thumb) in the gripping position on the wings. In other words, such additional gripping wings make it possible to avoid significant closing of the healthcare professional's hand at the end of the injection, since the healthcare professional can then change gripping position by positioning his fingers (except the thumb) on the additional gripping wings in order to regain an opening of the hand at the end of the injection. This results in better stability with a reduction in the risks of injection irregularities compared to the state of the art.

[0022] The manual syringe according to the invention may comprise one or more of the following characteristics.

[0023] According to a characteristic of the invention:

[0024] - the syringe body extends along a longitudinal axis, and has a length, noted

[0025] L; - the gripping fins and the additional gripping fins are spaced by a distance, noted h, along the longitudinal axis, the distance verifying 20% ​​L < h < 40% L.

[0026] Thus, an advantage provided by such a spacing distance between the gripping fins and the additional gripping fins is to obtain a similar variation in the separation distance between the gripping position and the additional gripping position, during the entire injection. In other words, such a spacing distance allows a similar amplitude of closure of the healthcare professional's hand in the gripping position (initial injection phase) and in the additional gripping position (final injection phase). This results in better stability with a reduction in the risks of injection irregularities compared to the state of the art.

[0027] According to a characteristic of the invention:

[0028] - the distance verifies 20% L < h < 30% L, preferably 25% L < h < 30% L, when the syringe body has a volume between 1 ml and 5 ml;

[0029] - the distance verifies 30% L < h < 40% L, preferably 35% L < h < 40% L, when the syringe body has a volume between 5 ml and 10 ml.

[0030] Thus, one advantage provided is to improve injection stability by taking into account the syringe body volume, in order to reduce the risks of injection irregularities for such syringe body volumes.

[0031] According to a characteristic of the invention:

[0032] - the syringe body extends along a longitudinal axis, and has a diameter, noted 0;

[0033] - the gripping fins and the additional gripping fins are spaced by a distance, noted h, along the longitudinal axis, the distance verifying 140% 0 < h < 160% 0.

[0034] Thus, an advantage provided is to improve injection stability by taking into account the syringe body diameter, in order to reduce the risks of injection irregularities.

[0035] According to a characteristic of the invention:

[0036] - the distance verifies 140% 0 < h < 150% 0 when the syringe body has a volume between 1 ml and 5 ml;

[0037] - the distance verifies 150% 0 < h < 160% 0 when the syringe body has a volume between 5 ml and 10 ml.

[0038] Thus, an advantage provided is to reduce the risks of injection irregularities by taking into account both the diameter and the volume of the syringe body. According to a characteristic of the invention:

[0039] - the syringe body extends along a longitudinal axis;

[0040] - the gripping fins delimit a first gripping surface, oriented towards the distal part of the manual pusher of the syringe body;

[0041] - the additional gripping fins delimit a second gripping surface, oriented towards the distal part of the manual pusher of the syringe body;

[0042] - the first and second gripping surfaces each extend along an axis perpendicular to the longitudinal axis.

[0043] Thus, one benefit provided is to improve injection stability.

[0044] According to a characteristic of the invention:

[0045] - the gripping fins delimit a first gripping surface;

[0046] - the additional gripping fins delimit a second gripping surface;

[0047] - the first and second gripping surfaces are convex, oriented towards the distal part of the manual plunger of the syringe body.

[0048] Thus, one advantage provided is to improve the comfort of the healthcare professional so that his fingers follow the convex shape of the gripping surface as the hand closes during the injection. Indeed, as the hand closes, the fingers positioned on a gripping surface bend slightly, and form a hollow that can follow the convex shape (bump) of the gripping surface.

[0049] According to a characteristic of the invention:

[0050] - the stopper has an end-of-travel position inside the syringe body;

[0051] - the gripping fins delimit a first gripping surface, oriented towards the distal part of the manual pusher of the syringe body, and a second opposite concave surface, oriented towards the proximal part of the manual pusher of the syringe body;

[0052] - the manual pusher delimits a first support surface, on which an injection pressure is manually exerted suitable for injecting the product, and a second opposite convex surface, oriented towards the second surface of the gripping fins;

[0053] - the second, convex surface of the manual pusher is designed to match the second, concave surface of the gripping fins when the stopper is in the end-of-travel position.

[0054] Thus, one advantage provided is to reduce the separation distance between the thumb (or palm) positioned on the pusher, and the fingers of the hand (except the thumb) in the gripping position on the wings. This results in greater comfort for the healthcare professional at the start of the injection, particularly when the product to be injected requires significant pressure to be exerted on the pusher.

[0055] According to a characteristic of the invention, the manual syringe comprises a connecting member, arranged to connect the gripping fins and the additional gripping fins, and mounted on the proximal part to the manual pusher of the syringe body.

[0056] Thus, one advantage provided is to facilitate the assembly of the gripping wings and additional gripping wings on the syringe body. In addition, such a connecting member contributes to improving injection stability. Indeed, the pincer grip is stable because the lateral surfaces of the index and middle fingers facing each other (radial side of the middle finger and ulnar side of the index finger) can find support against the connecting member. In other words, the connecting member makes it possible to fill the space between the index and middle fingers when they are in the pincer grip position.

[0057] According to a characteristic of the invention:

[0058] - the syringe body extends along a longitudinal axis;

[0059] - the part proximal to the manual pusher of the syringe body comprises a collar extending in a plane orthogonal to the longitudinal axis;

[0060] - the connecting member comprises a slot, arranged to cooperate with the collar so as to: block the connecting member in translation along the longitudinal axis; block the connecting member in rotation around two axes, perpendicular to each other, and extending in the plane orthogonal to the longitudinal axis; allow rotation of the connecting member around the longitudinal axis.

[0061] Thus, an advantage provided is to obtain easy and reliable mounting of the connecting member on the syringe body.

[0062] According to a characteristic of the invention:

[0063] - the slot is arranged to cooperate with the collar along an axis of insertion of the collar into the slot;

[0064] - the connecting member comprises at least one shoulder, designed to block the connecting member in translation along the insertion axis when the connecting member is mounted on the part proximal to the manual pusher of the syringe body.

[0065] Thus, an advantage provided by such a shoulder is to easily obtain a stable position of the connecting member along the insertion axis. According to a characteristic of the invention:

[0066] - the part proximal to the manual pusher of the syringe body has graduations;

[0067] - the connecting member comprises a hollow body, designed to receive the syringe body, the hollow body having an unclosed connecting surface, connecting the gripping fins and the additional gripping fins, the unclosed connecting surface delimiting an opening designed to observe the graduations.

[0068] According to a characteristic of the invention, the additional gripping fins have a mechanical resistance lower than that of the gripping fins.

[0069] According to a characteristic of the invention:

[0070] - the gripping fins are made from a first material;

[0071] - the additional gripping fins are made from a second material having a mechanical resistance lower than that of the first material.

[0072] Thus, one advantage provided is to obtain a gain in lightness for the syringe.

[0073] According to a characteristic of the invention, the connecting member comprises a part which flares towards the gripping fins so that the additional gripping fins have a mechanical resistance lower than that of the gripping fins.

[0074] Thus, an advantage provided by the flared part is to obtain mechanical reinforcement towards the gripping fins which are the most stressed at the start of injection.

[0075] The invention also relates to a device for gripping a manual syringe, the manual syringe comprising:

[0076] - a syringe body, intended to receive a product to be injected;

[0077] - a piston rod, slidably mounted inside the syringe body in one direction of injection of the product and in an opposite direction, and having first and second opposite ends;

[0078] - a stopper, arranged at the first end of the piston rod;

[0079] - a manual pusher, arranged at the second end of the piston rod, and on which an injection pressure is manually exerted suitable for injecting the product; the syringe body having: a part distal to the manual pusher, intended to be equipped with a needle holder; a part proximal to the manual pusher, opposite the distal part; the gripping device comprising:

[0080] - gripping fins and additional gripping fins;

[0081] - a connecting member, arranged to connect the gripping fins and the additional gripping fins so that the additional gripping fins are arranged at a distance from the gripping fins towards the direction of injection of the product when the connecting member is mounted on the part proximal to the manual pusher of the syringe body; the connecting member being dimensioned so that the gripping fins define a gripping position and the additional gripping fins define an additional gripping position when the connecting member is mounted on the part proximal to the manual pusher of the syringe body.

[0082] As mentioned above, such additional gripping wings make it possible to reduce the amplitude of the variation in the separation distance compared to the state of the art during the entire injection, which improves the comfort of the healthcare professional. As defined above, the separation distance is the distance separating the thumb (or palm) positioned on the pusher, and the fingers of the hand (except the thumb) in the gripping position on the wings. In other words, such additional gripping wings make it possible to avoid significant closing of the healthcare professional's hand at the end of the injection, since the healthcare professional can then change gripping position by positioning his fingers (except the thumb) on the additional gripping wings in order to regain an opening of the hand at the end of the injection.This results in better stability with a reduction in the risk of injection irregularities compared to the state of the art.

[0083] The invention also relates to a manual syringe, comprising:

[0084] - a syringe body, intended to receive a product to be injected;

[0085] - a piston rod, slidably mounted inside the syringe body in one direction of injection of the product and in an opposite direction, and having first and second opposite ends;

[0086] - a stopper, arranged at the first end of the piston rod;

[0087] - a manual pusher, arranged at the second end of the piston rod, and on which an injection pressure is manually exerted suitable for injecting the product; the syringe body having: a part distal to the manual pusher, intended to be equipped with a needle holder; a part proximal to the manual pusher, opposite the distal part; the manual syringe comprising a gripping device according to the invention. As mentioned previously, such a manual syringe according to the invention makes it possible to reduce the discomfort of the healthcare professional at the start of the injection and to reduce injection irregularities at the end of the injection, compared to the state of the art, thanks to the additional gripping fins of the gripping device. The first assembly, comprising the manual pusher and the gripping fins, allows a first digital grip of the pincer type, used at the start of the injection.The second assembly, comprising the manual pusher and the additional gripping wings, allows a second digital grip of the pincer type, used at the end of the injection. Such additional gripping wings make it possible to reduce the amplitude of the variation in the separation distance compared to the state of the art during the entire injection, which improves the comfort of the healthcare professional. As defined previously, the separation distance is the distance separating the thumb (or palm) positioned on the pusher, and the fingers of the hand (except the thumb) in the gripping position on the wings.In other words, such additional gripping wings make it possible to avoid significant closure of the healthcare professional's hand at the end of the injection, since the healthcare professional can then change gripping position by positioning his fingers (except the thumb) on the additional gripping wings in order to regain an opening of the hand at the end of the injection. This results in better stability with a reduction in the risks of injection irregularities compared to the state of the art.

[0088] The invention finally relates to an injection kit, comprising:

[0089] - a syringe body, intended to receive a product to be injected;

[0090] - a piston rod, which can be slidably mounted inside the syringe body in one direction of injection of the product and in an opposite direction, and having first and second opposite ends;

[0091] - a stopper, which can be arranged at the first end of the piston rod;

[0092] - a manual pusher, arranged at the second end of the piston rod, and on which an injection pressure suitable for injecting the product is intended to be manually exerted;

[0093] - a needle holder, intended to equip a part distal to the manual pusher of the syringe body; the syringe body having a part proximal to the manual pusher, opposite the distal part;

[0094] - a gripping device according to the invention.

[0095] As mentioned above, the additional gripping fins of the gripping device make it possible to reduce the amplitude of the variation in the separation distance compared to the state of the art during the entire injection, which improves the comfort of the healthcare professional. As defined above, the separation distance is the distance separating the thumb (or palm) positioned on the pusher, and the fingers of the hand (except the thumb) in the gripping position on the fins. In other words, such additional gripping fins make it possible to avoid significant closing of the healthcare professional's hand at the end of the injection, since the healthcare professional can then change gripping position by positioning his fingers (except the thumb) on the additional gripping fins in order to regain an opening of the hand at the end of the injection.This results in better stability with a reduction in the risk of injection irregularities compared to the state of the art.

[0096] Definitions

[0097] - By "manual syringe" is meant a syringe comprising a pusher on which injection pressure is manually exerted (by a thumb or a palm) to move the plunger rod in order to inject a product.

[0098] - By “distal part” we mean the part of the syringe body which is furthest from the manual plunger.

[0099] - By “proximal part” we mean the part of the syringe body which is closest to the manual plunger.

[0100] - "Grip" means a digital grip, of the pincer type. At least two fingers of the hand (except the thumb), generally the index and middle fingers, grasp the gripping fins, or additional gripping fins, while the thumb (or the palm of the hand) exerts counter-pressure on the manual pusher in order to inject the product.

[0101] - By "gripping position (respectively additional gripping position)" is meant a position of the gripping wings (respectively additional gripping wings) on the syringe body, adapted to allow digital gripping (with at least two fingers, except the thumb) of the corresponding wings, the digital gripping being of the pincer grip type, the thumb or the palm of the hand exerting counter-pressure on the manual pusher in order to inject the product.

[0102] - By "arranged at a distance [. . .] towards the direction of injection of the product" is meant that the additional gripping wings are spaced from the gripping wings along the syringe body. The direction of injection of the product is defined from the proximal part to the distal part of the syringe body. The spacing distance between the gripping wings and the additional gripping wings is quantified along the longitudinal axis of the syringe body, from center to center, that is to say between the points of intersection of the longitudinal axis of the syringe body with the corresponding gripping wings.

[0103] - By "concave" we mean that the curved surface forms a hollow. The orientation of the concave surface corresponds to the orientation of the curvature. A concave surface oriented towards an element A means that the curvature of the concave surface is turned (pointed) towards the element A.

[0104] - By "convex" we mean that the curved surface forms a bump or protrusion. The orientation of the convex surface corresponds to the orientation of the curvature. A convex surface oriented towards an element A means that the curvature of the convex surface is turned (pointed) towards the element A.

[0105] - "Flared portion" means a portion of the connecting member that is widened at one end. The flared portion of the connecting member is flared toward the gripping fins, meaning that the widened end of the connecting member is oriented (pointed) toward the gripping fins.

[0106] Brief description of the drawings

[0107] Other features and advantages will become apparent in the detailed description of various embodiments of the invention, the description being accompanied by examples and references to the attached drawings.

[0108] Figure 1 is a schematic perspective view of a manual syringe according to the invention.

[0109] Figure 2 is a partial schematic perspective view of a manual syringe according to the invention, illustrating a piston rod provided with a stopper and a pusher.

[0110] Figure 3 is a partial schematic perspective view of a manual syringe according to the invention, illustrating the gripping wings and additional gripping wings mounted on a syringe body.

[0111] Figure 4 is a schematic perspective view of a gripping device according to the invention. Figure 4 illustrates gripping fins and additional gripping fins connected to each other by a connecting member. The connecting member is intended to be mounted on the portion proximal to the manual pusher of the syringe body.

[0112] Figure 5 is a schematic view similar to Figure 4, shown from another perspective.

[0113] Figure 6 is a schematic view similar to Figure 4, shown from the front. Figure 7 is a schematic perspective view of a manual syringe according to the invention, illustrating a larger syringe body than that of Figure 1.

[0114] Figure 8 is a partial schematic perspective view of a manual syringe according to the invention, illustrating a piston rod provided with a stopper and a pusher for equipping a larger syringe body than that of Figure 1.

[0115] Figure 9 is a partial schematic perspective view of a manual syringe according to the invention, illustrating the gripping wings and the additional gripping wings mounted on a syringe body (larger than that of Figure 1).

[0116] Figure 10 is a schematic perspective view of a gripping device according to the invention. Figure 10 illustrates gripping fins and additional gripping fins connected to each other by a connecting member. The connecting member is intended to be mounted on the portion proximal to the manual pusher of the syringe body (larger than that of Figure 1).

[0117] Figure 11 is a schematic view similar to Figure 10, shown from the front.

[0118] It should be noted that the drawings described above are schematic, and are not necessarily to scale for the sake of readability and to simplify their understanding.

[0119] Detailed description of the implementation methods

[0120] Identical elements or those providing the same function will bear the same references for the different embodiments, for the sake of simplification.

[0121] Manual syringe

[0122] An object of the invention is a manual syringe, comprising:

[0123] - a syringe body 1, intended to receive a product to be injected;

[0124] - a piston rod 2, slidably mounted inside the syringe body 1 in one direction of injection of the product and in an opposite direction, and having first and second opposite ends 20, 21;

[0125] - a stopper 3, arranged at the first end 20 of the piston rod 2;

[0126] - a manual pusher 4, arranged at the second end 21 of the piston rod 2, and on which an injection pressure is manually exerted suitable for injecting the product; the syringe body 1 having: a distal part 10 to the manual pusher 4, intended to be equipped with a needle holder; a proximal part 11 to the manual pusher 4, opposite the distal part 10, and provided with gripping fins 5 defining a gripping position; remarkable in that the proximal part 11 to the manual pusher 4 of the syringe body 1 is provided with additional gripping fins 6, arranged at a distance from the gripping fins 5 towards the direction of injection of the product, so as to define an additional gripping position.

[0127] Syringe body

[0128] The syringe body 1 is intended to receive the product to be injected. The product to be injected is preferably a viscous product, more preferably a viscoelastic gel, even more preferably a viscoelastic gel based on hyaluronic acid.

[0129] The syringe body 1 is preferably cylindrical. The syringe body 1 may extend along a longitudinal axis X'-X. The syringe body 1 may have a length, denoted L. The syringe body 1 may have a diameter, denoted 0. By way of non-limiting example, the syringe body 1 may have a volume of between 1 ml and 10 ml. In particular, a volume greater than 10 ml for the syringe body 1 is also conceivable.

[0130] The distal portion 10 of the manual pusher 4 of the syringe body 1 is intended to be equipped with a needle holder. The distal portion 10 of the manual pusher 4 of the syringe body 1 is located at a first end of the syringe body 1. The first end of the syringe body 1 is open so as to receive the needle holder. As illustrated in Figures 1 and 7, in the absence of a needle holder, the distal portion 10 of the manual pusher 4 of the syringe body 1 can be obstructed by a cap 100. In other words, the first end of the syringe body 1 can be obstructed by a cap 100.

[0131] The proximal portion 11 to the manual pusher 4 of the syringe body 1, opposite the distal portion 10, is provided with gripping fins 5. The proximal portion 11 to the manual pusher 4 of the syringe body 1 is located at a second end of the syringe body 1, opposite the first end. The second end of the syringe body 1 is open so as to receive the piston rod 2. In other words, the proximal portion 11 to the manual pusher 4 of the syringe body 1 is open so as to receive the piston rod 2. The proximal portion 11 to the manual pusher 4 of the syringe body 1 advantageously comprises a collar 110 extending in a plane orthogonal to the longitudinal axis X'-X along which the syringe body 1 extends. The proximal portion 11 to the manual pusher 4 of the syringe body 1 advantageously comprises graduations. The graduations are arranged to measure a volume of the product to be injected.The syringe body 1 is preferably made of a plastic material, more preferably of a thermoplastic material. By way of non-limiting example, the syringe body 1 may be made of polycarbonate.

[0132] Piston rod

[0133] The piston rod 2 is slidably mounted inside the syringe body 1 in a direction of injection of the product and in a direction opposite to the direction of injection of the product. The direction of injection of the product is defined from the proximal portion 11 to the manual pusher 4 of the syringe body 1 to the distal portion 10 to the manual pusher 4 of the syringe body 1. The piston rod 2 has first and second opposite ends 20, 21. The piston rod 2 may comprise a piston head 200 arranged at the first end 20 of the piston rod 2, and designed to cooperate with the stopper 3. The piston rod 2 and the piston head 200 are advantageously in one piece. The piston head 200 may be a snap-on head designed to cooperate with the stopper 3 by elastic fitting. According to possible alternatives, the piston head 200 can cooperate with the stopper 3 by screwing or by embedding.

[0134] The piston rod 2 is preferably made of a plastic material, more preferably of a thermoplastic material. By way of non-limiting example, the piston rod 2 may be made of polycarbonate.

[0135] Stopper

[0136] The stopper 3 is arranged at the first end 20 of the piston rod 2. The stopper 3 may have an inner wall, elastically deformable, and delimiting a cavity. By “inner wall”, we mean the inner surface of the stopper 3 delimiting a cavity, the stopper 3 being hollow. By “elastically deformable”, we mean that the inner wall of the stopper 3 can deform reversibly under the action of mechanical stresses (less than the elastic limit), that is to say that the inner wall of the stopper 3 can return to its initial shape when the mechanical stresses cease. The piston head 200 may form a snap-fastening head making it possible to fix the stopper 3 to the first end 20 of the piston rod 2 by elastic fitting. By way of non-limiting example, the stopper 3 may be made of an elastomeric material, such as a chlorinated or brominated butyl rubber.

[0137] Alternatively, the stopper 3 may be rigid, without an internal cavity (i.e., not hollow). If necessary, the stopper 3 may be fixed to the first end 20 of the piston rod 2 by screwing or by embedding.

[0138] The stopper 3 has an end-of-travel position inside the syringe body 1. Manual pusher

[0139] The manual pusher 4 is arranged at the second end 21 of the piston rod 2. Pressure is intended to be exerted manually on the manual pusher 4 by the healthcare professional in order to inject the product.

[0140] The manual pusher 4 and the piston rod 2 are advantageously in one piece. The manual pusher 4 is advantageously rigid, that is to say non-deformable under normal conditions of use, for example at room temperature (between 20°C and 30°C) and under atmospheric pressure.

[0141] The manual push button 4 delimits:

[0142] - a first support surface 40, on which an injection pressure is manually exerted suitable for injecting the product; and

[0143] - a second opposite convex surface 41.

[0144] The second surface 41 of the manual pusher 4 is opposite the first support surface 40.

[0145] Gripping fins

[0146] The gripping fins 5 are arranged on the proximal portion 11 of the manual pusher 4 of the syringe body 1 so as to define a gripping position. The gripping fins 5 form lateral extensions projecting from the syringe body 1. The gripping fins 5 are advantageously in one piece.

[0147] The gripping fins 5 delimit a first gripping surface 50, oriented towards the distal portion 10 of the manual pusher 4 of the syringe body 1. The gripping fins 5 may have a second opposite concave surface 51, oriented towards the proximal portion 11 of the manual pusher 4 of the syringe body 1. The second surface 51 of the gripping fins 5 is opposite the first gripping surface 50.

[0148] The second convex surface 41 of the manual pusher 4 (opposite the first support surface 40 and oriented towards the second surface 51 of the gripping fins 5) is advantageously designed to match the second concave surface 51 of the gripping fins 5 when the stopper 3 is in the end-of-travel position.

[0149] Additional gripping fins

[0150] The additional gripping fins 6 are arranged on the proximal portion 11 of the manual pusher 4 of the syringe body 1, at a distance from the gripping fins 5, so as to define an additional gripping position. More precisely, the additional gripping fins 6 are arranged at a distance from the gripping fins 5 towards the direction of injection of the product. The additional gripping fins 6 form lateral extensions projecting from the syringe body 1. The additional gripping fins 6 are advantageously in one piece.

[0151] The gripping fins 5 and the additional gripping fins 6 are spaced apart by a distance, denoted "h", along the longitudinal axis X'-X (along which the syringe body 1 extends). The distance "h" advantageously satisfies 20% L < h < 40% L, where "L" is the length of the syringe body 1 along the longitudinal axis X'-X. The distance "h" can satisfy 20% L < h < 30% L, preferably 25% L < h < 30% L, when the syringe body 1 has a volume of between 1 ml and 5 ml. The distance "h" can satisfy 30% L < h < 40% L, preferably 35% L < h < 40% L, when the syringe body 1 has a volume of between 5 ml and 10 ml.

[0152] The distance "h" advantageously verifies 140% 0 < h < 160% 0, where "0" is the diameter of the syringe body 1. The distance "h" can verify 140% 0 < h < 150% 0, when the syringe body 1 has a volume of between 1 ml and 5 ml. The distance "h" can verify 150% 0 < h < 160% 0, when the syringe body 1 has a volume of between 5 ml and 10 ml.

[0153] The additional gripping fins 6 delimit a second gripping surface 60, oriented towards the distal portion 10 to the manual pusher 4 of the syringe body 1. The first gripping surface 50 (belonging to the gripping fins 5) and the second gripping surface 60 (belonging to the additional gripping fins 6) advantageously each extend along an axis perpendicular to the longitudinal axis X'-X (along which the syringe body 1 extends). The first and second gripping surfaces 50, 60 are advantageously convex, oriented towards the distal portion 10 to the manual pusher 4 of the syringe body 1. In other words, the first and second gripping surfaces 50, 60 advantageously have a transverse profile (i.e. perpendicular to the longitudinal axis X'-X along which the syringe body 1 extends) forming a convex surface.The second gripping surface 60 (belonging to the additional gripping fins 6) may have an area smaller than that of the first gripping surface 50 (belonging to the gripping fins 5). By way of non-limiting example, the area of ​​each of the first and second gripping surfaces 50, 60 may be between 400 mm. 2 and 950 mm 2 , preferably between 600 mm 2 and 750 mm 2 when the volume of the syringe body 1 is between 1 ml and 5 ml; preferably between 750 mm 2 and 950 mm 2 when the volume of the syringe body 1 is between 5 ml and 10 ml.

[0154] The additional gripping fins 6 advantageously have a mechanical resistance lower than that of the gripping fins 5. According to an exemplary embodiment:

[0155] - the gripping fins 5 are made of a first material; - the additional gripping fins 6 are made of a second material having a mechanical resistance lower than that of the first material.

[0156] By way of non-limiting examples, the first material of the gripping fins 5 may be a material having a Young's modulus of between 900 MPa and 1600 MPa, for example a thermoplastic material. The second material of the additional gripping fins 6 may be a material having a Young's modulus of between 1 MPa and 2 MPa, for example an elastomeric material. By "Young's modulus" is meant the Young's modulus stricto sensu or the 100% modulus in the case of an elastomeric material.

[0157] According to an alternative, the gripping fins 5 and the additional gripping fins 6 are made of the same material. The additional gripping fins 6 can then have a geometry different from that of the gripping fins 5 so as to have a mechanical strength lower than that of the gripping fins 5. A possibility of different geometry is to reduce the gripping surface 60 of the additional gripping fins 6 relative to the gripping surface 50 of the gripping fins 5 so that the additional gripping fins 6 have a mechanical strength lower than that of the gripping fins 5.

[0158] Connecting body

[0159] The manual syringe advantageously comprises a connecting member 7, arranged to connect the gripping fins 5 and the additional gripping fins 6. The connecting member 7 is mounted on the proximal part 11 to the manual pusher 4 of the syringe body 1. The connecting member 7, the gripping fins 5 and the additional gripping fins 6 may be in one piece. When the gripping fins 5 and the additional gripping fins 6 are made of different first and second materials, the connecting member 7 may be manufactured by bi-injection (bi-material) molding. According to an alternative, the connecting member 7 and the gripping fins 5 may be in one piece. If necessary, the additional gripping fins 6 are mounted on the connecting member 7, for example by a built-in connection or by elastic fitting.

[0160] The connecting member 7 advantageously comprises a slot 70, arranged to cooperate with the collar 110 so as to:

[0161] - block in translation the connecting member 7 along the longitudinal axis X'-X (along which the syringe body 1 extends);

[0162] - blocking the connecting member 7 in rotation around two axes, perpendicular to each other, and extending in the orthogonal plane (in which the collar 110 extends) to the longitudinal axis X'-X (along which the syringe body 1 extends); - allowing rotation of the connecting member 7 around the longitudinal axis X'-X (along which the syringe body 1 extends).

[0163] The slot 70 is advantageously arranged to cooperate with the collar 110 along an axis of insertion of the collar 110 into the slot 70. The connecting member 7 advantageously comprises at least one shoulder 71, designed to block the connecting member 7 in translation along the insertion axis when the connecting member 7 is mounted on the proximal part 11 to the manual pusher 4 of the syringe body 1.

[0164] The connecting member 7 advantageously comprises a hollow body 72, designed to receive the syringe body 1. Advantageously, said at least one shoulder 71 extends along the hollow body 72 along an axis parallel to the longitudinal axis X'-X along which the syringe body 1 extends. The hollow body 72 of the connecting member 7 advantageously has a non-closed connecting surface 720, connecting the gripping fins 5 and the additional gripping fins 6. The non-closed connecting surface 720 advantageously delimits an opening 721 designed to observe the graduations with which the proximal part 11 may be provided to the manual pusher 4 of the syringe body 1. The non-closed connecting surface 720 is advantageously arranged to match the shape of the syringe body 1.

[0165] The connecting member 7 may comprise a flared portion 73 towards the gripping fins 5 so that the additional gripping fins 6 have a mechanical resistance lower than that of the gripping fins 5. This embodiment may be preferred for large volumes of syringe body 1, for example 10 ml.

[0166] Device for gripping a manual syringe

[0167] An object of the invention is a device for gripping a manual syringe. The gripping device is intended to equip a manual syringe comprising:

[0168] - a syringe body 1, intended to receive a product to be injected;

[0169] - a piston rod 2, slidably mounted inside the syringe body 1 in one direction of injection of the product and in an opposite direction, and having first and second opposite ends 20, 21;

[0170] - a stopper 3, arranged at the first end 20 of the piston rod 2;

[0171] - a manual pusher 4, arranged at the second end 21 of the piston rod 2, and on which an injection pressure is manually exerted suitable for injecting the product.

[0172] Syringe body 1 has:

[0173] - a distal part 10 to the manual pusher 4, intended to be equipped with a needle holder;

[0174] - a proximal part 11 to the manual pusher 4, opposite the distal part 10. The syringe body 1 is intended to receive the product to be injected. The product to be injected is preferably a viscous product, more preferably a viscoelastic gel, even more preferably a viscoelastic gel based on hyaluronic acid.

[0175] The syringe body 1 is preferably cylindrical. The syringe body 1 may extend along a longitudinal axis X'-X. The syringe body 1 may have a length, denoted L. The syringe body 1 may have a diameter, denoted 0. As a non-limiting example, the syringe body 1 may have a volume of between 1 ml and 10 ml. In particular, a volume greater than 10 ml for the syringe body 1 is also conceivable. The proximal portion 11 to the manual pusher 4 of the syringe body 1 advantageously comprises a collar 110 extending in a plane orthogonal to the longitudinal axis X'-X along which the syringe body 1 extends. The proximal portion 11 to the manual pusher 4 of the syringe body 1 advantageously comprises graduations. The graduations are arranged to measure a volume of the product to be injected.

[0176] The gripping device according to the invention comprises:

[0177] - gripping fins 5 and additional gripping fins 6;

[0178] - a connecting member 7, arranged to connect the gripping fins 5 and the additional gripping fins 6 so that the additional gripping fins 6 are arranged at a distance from the gripping fins 5 towards the direction of injection of the product when the connecting member 7 is mounted on the proximal part 11 to the manual pusher 4 of the syringe body 1.

[0179] The connecting member 7 is dimensioned so that the gripping fins 5 define a gripping position and the additional gripping fins 6 define an additional gripping position when the connecting member 7 is mounted on the proximal portion 11 to the manual pusher 4 of the syringe body 1.

[0180] The connecting member 7 is advantageously dimensioned so that the gripping fins 5 and the additional gripping fins 6 are spaced apart by a distance, denoted "h", along the longitudinal axis X'-X (along which the syringe body 1 extends) when the connecting member 7 is mounted on the proximal part 11 to the manual pusher 4 of the syringe body 1. The connecting member 7 is advantageously dimensioned so that the distance "h" verifies 20% L < h < 40% L, where "L" is the length of the syringe body 1 along the longitudinal axis X'-X. The distance "h" can verify 20% L < h < 30% L, preferably 25% L < h < 30% L, when the syringe body 1 has a volume of between 1 ml and 5 ml. The distance “h” can verify 30% L < h < 40% L, preferably 35% L < h < 40% L, when the syringe body 1 has a volume between 5 ml and 10 ml.The connecting member 7 is advantageously dimensioned so that the distance “h” verifies 140% 0 < h < 160% 0, where “0” is the diameter of the syringe body 1. The distance “h” can verify 140% 0 < h < 150% 0, when the syringe body 1 has a volume of between 1 ml and 5 ml. The distance “h” can verify 150% 0 < h < 160% 0, when the syringe body 1 has a volume of between 5 ml and 10 ml.

[0181] The connecting member 7 advantageously comprises a slot 70, arranged to cooperate with the collar 110 so as to:

[0182] - block in translation the connecting member 7 along the longitudinal axis X'-X (along which the syringe body 1 extends);

[0183] - locking the connecting member 7 in rotation around two axes, perpendicular to each other, and extending in the plane orthogonal (in which the collar 110 extends) to the longitudinal axis X'-X (along which the syringe body 1 extends);

[0184] - allow rotation of the connecting member 7 around the longitudinal axis X'-X (along which the syringe body 1 extends).

[0185] The slot 70 is advantageously arranged to cooperate with the collar 110 along an axis of insertion of the collar 110 into the slot 70. The connecting member 7 advantageously comprises at least one shoulder 71, designed to block the connecting member 7 in translation along the insertion axis when the connecting member 7 is mounted on the proximal part 11 to the manual pusher 4 of the syringe body 1.

[0186] The connecting member 7 advantageously comprises a hollow body 72, designed to receive the syringe body 1. Advantageously, said at least one shoulder 71 extends along the hollow body 72 along an axis parallel to the longitudinal axis X'-X along which the syringe body 1 extends. The hollow body 72 of the connecting member 7 advantageously has a non-closed connecting surface 720, connecting the gripping fins 5 and the additional gripping fins 6. The non-closed connecting surface 720 advantageously delimits an opening 721 designed to observe the graduations with which the proximal part 11 can be provided with the manual pusher 4 of the syringe body 1.

[0187] The connecting member 7 may comprise a flared portion 73 towards the gripping fins 5 so that the additional gripping fins 6 have a mechanical resistance lower than that of the gripping fins 5.

[0188] An object of the invention is also a manual syringe equipped with such a gripping device.

[0189] Injection kit

[0190] An object of the invention is an injection kit, comprising: - a syringe body 1, intended to receive a product to be injected;

[0191] - a piston rod 2, which can be slidably mounted inside the syringe body 1 in a direction of injection of the product and in an opposite direction, and having first and second opposite ends 20, 21; - a stopper 3, which can be arranged at the first end 20 of the piston rod 2;

[0192] - a manual pusher 4, arranged at the second end 21 of the piston rod 2, and on which an injection pressure suitable for injecting the product is intended to be manually exerted;

[0193] - a needle holder, intended to equip a distal part 10 to the manual pusher 4 of the syringe body 1; the syringe body 1 having a proximal part 11 to the manual pusher 4, opposite the distal part 10;

[0194] - a gripping device according to the invention.

[0195] The invention is not limited to the embodiments disclosed. Those skilled in the art are able to consider their technically effective combinations and to substitute equivalents for them.

Claims

CLAIMS 1. Manual syringe, comprising: - a syringe body (1), intended to receive a product to be injected; - a piston rod (2), slidably mounted inside the syringe body (1) in one direction of injection of the product and in an opposite direction, and having first and second opposite ends (20, 21); - a stopper (3), arranged at the first end (20) of the piston rod (2); - a manual pusher (4), arranged at the second end (21) of the piston rod (2), and on which an injection pressure is manually exerted suitable for injecting the product; the syringe body (1) having: a distal part (10) to the manual pusher (4), intended to be equipped with a needle holder; a proximal part (11) to the manual pusher (4), opposite the distal part (10), and provided with gripping fins (5) defining a gripping position; characterized in that the proximal part (11) to the manual pusher (4) of the syringe body is provided with additional gripping fins (6), arranged at a distance from the gripping fins (5) towards the direction of injection of the product, so as to define an additional gripping position.

2. Manual syringe according to claim 1, in which: - the syringe body (1) extends along a longitudinal axis (X'-X), and has a length, noted L; - the gripping fins (5) and the additional gripping fins (6) are spaced apart by a distance, noted h, along the longitudinal axis (X'-X), the distance verifying 20% ​​L < h < 40% L.

3. Manual syringe according to claim 2, in which: - the distance verifies 20% L < h < 30% L, preferably 25% L < h < 30% L, when the syringe body (1) has a volume between 1 ml and 5 ml; - the distance verifies 30% L < h < 40% L, preferably 35% L < h < 40% L, when the syringe body (1) has a volume between 5 ml and 10 ml.

4. Manual syringe according to one of claims 1 to 3, in which: - the syringe body (1) extends along a longitudinal axis (X'-X), and has a diameter, noted 0; - the gripping fins (5) and the additional gripping fins (6) are spaced apart by a distance, noted h, along the longitudinal axis (X'-X), the distance verifying 140% 0 < h < 160% 0.

5. Manual syringe according to claim 4, in which: - the distance verifies 140% 0 < h < 150% 0 when the syringe body (1) has a volume between 1 ml and 5 ml; - the distance verifies 150% 0 < h < 160% 0 when the syringe body (1) has a volume between 5 ml and 10 ml.

6. Manual syringe according to one of claims 1 to 5, in which: - the syringe body (1) extends along a longitudinal axis (X'-X); - the gripping fins (5) delimit a first gripping surface (50), oriented towards the distal part (10) of the manual pusher (4) of the syringe body (1); - the additional gripping fins (6) delimit a second gripping surface (60), oriented towards the distal part (10) of the manual pusher (4) of the syringe body (1); - the first and second gripping surfaces (50, 60) each extend along an axis perpendicular to the longitudinal axis (X'-X).

7. Manual syringe according to one of claims 1 to 6, in which: - the gripping fins (5) delimit a first gripping surface (50); - the additional gripping fins (6) delimit a second gripping surface (60); - the first and second gripping surfaces (50, 60) are convex, oriented towards the distal part (10) of the manual pusher (4) of the syringe body (1).

8. Manual syringe according to one of claims 1 to 7, in which: - the stopper (3) has an end-of-travel position inside the syringe body (1); - the gripping fins (5) delimit a first gripping surface (50), oriented towards the distal part (10) to the manual pusher (4) of the syringe body (1), and a second opposite concave surface (51), oriented towards the proximal part (11) to the manual pusher (4) of the syringe body (1); - the manual pusher (4) delimits a first support surface (40), on which an injection pressure is manually exerted suitable for injecting the product, and a second convex opposite surface (41), oriented towards the second surface (51) of the gripping fins (5); - the second convex surface (41) of the manual pusher (4) is designed to match the second concave surface (51) of the gripping fins (5) when the stopper (3) is in the end-of-travel position.

9. Manual syringe according to one of claims 1 to 8, comprising a connecting member (7), arranged to connect the gripping fins (5) and the additional gripping fins (6), and mounted on the proximal part (11) to the manual pusher (4) of the syringe body (1).

10. Manual syringe according to claim 9, in which: - the syringe body (1) extends along a longitudinal axis (X'-X); - the proximal part (11) to the manual pusher (4) of the syringe body (1) comprises a collar (110) extending in a plane orthogonal to the longitudinal axis (X'-X); - the connecting member (7) comprises a slot (70), arranged to cooperate with the collar (110) so as to: block the connecting member (7) in translation along the longitudinal axis (X'-X); block the connecting member (7) in rotation around two axes, perpendicular to each other, and extending in the plane orthogonal to the longitudinal axis (X'-X); allow rotation of the connecting member (7) around the longitudinal axis (X'-X).

11. Manual syringe according to claim 10, in which: - the slot (70) is arranged to cooperate with the collar (110) along an axis of insertion of the collar (110) into the slot (70); - the connecting member (7) comprises at least one shoulder (71), designed to block the connecting member (7) in translation along the insertion axis when the connecting member (7) is mounted on the proximal part (11) to the manual pusher (4) of the syringe body (1).

12. Manual syringe according to one of claims 9 to 11, in which: - the proximal part (11) to the manual pusher (4) of the syringe body (1) has graduations; - the connecting member (7) comprises a hollow body (72), designed to receive the syringe body (1), the hollow body (72) having a non-closed connecting surface (720), connecting the gripping fins (5) and the additional gripping fins (6), the unclosed connecting surface (720) delimiting an opening (721) designed to observe the graduations.

13. Manual syringe according to one of claims 1 to 12, in which the additional gripping fins (6) have a mechanical resistance lower than that of the gripping fins (5).

14. Manual syringe according to claim 13, in which: - the gripping fins (5) are made of a first material; - the additional gripping fins (6) are made from a second material having a mechanical resistance lower than that of the first material.

15. Manual syringe according to claim 13 in combination with claim 9, wherein the connecting member (7) comprises a flared portion (73) towards the gripping fins (5) so that the additional gripping fins (6) have a mechanical resistance lower than that of the gripping fins (5).

16. Device for gripping a manual syringe, the manual syringe comprising: - a syringe body (1), intended to receive a product to be injected; - a piston rod (2), slidably mounted inside the syringe body (1) in one direction of injection of the product and in an opposite direction, and having first and second opposite ends (20, 21); - a stopper (3), arranged at the first end (20) of the piston rod (2); - a manual pusher (4), arranged at the second end (21) of the piston rod (2), and on which an injection pressure is manually exerted suitable for injecting the product; the syringe body (1) having: a distal part (10) to the manual pusher (4), intended to be equipped with a needle holder; a proximal part (11) to the manual pusher (4), opposite the distal part (10); the gripping device comprising: - gripping fins (5) and additional gripping fins (6); - a connecting member (7), arranged to connect the gripping fins (5) and the additional gripping fins (6) so that the additional gripping fins (6) are arranged at a distance from the gripping fins (5) towards the direction of injection of the product when the connecting member (7) is mounted on the proximal part (11) to the manual pusher (4) of the syringe body (1); the connecting member (7) being dimensioned so that the gripping fins (5) define a gripping position and the additional gripping fins (6) define an additional gripping position when the connecting member (7) is mounted on the proximal part (11) to the manual pusher (4) of the syringe body (1).

17. Manual syringe, comprising: - a syringe body (1), intended to receive a product to be injected; - a piston rod (2), slidably mounted inside the syringe body (1) in one direction of injection of the product and in an opposite direction, and having first and second opposite ends (20, 21); - a stopper (3), arranged at the first end (20) of the piston rod (2); - a manual pusher (4), arranged at the second end (21) of the piston rod (2), and on which an injection pressure is manually exerted suitable for injecting the product; the syringe body (1) having: a distal part (10) to the manual pusher (4), intended to be equipped with a needle holder; a proximal part (11) to the manual pusher (4), opposite the distal part (10); the manual syringe comprising a gripping device according to claim 16.

18. Injection kit, comprising: - a syringe body (1), intended to receive a product to be injected; - a piston rod (2), which can be slidably mounted inside the syringe body (1) in one direction of injection of the product and in an opposite direction, and having first and second opposite ends (20, 21); - a stopper (3), which can be arranged at the first end (20) of the piston rod (2); - a manual pusher (4), arranged at the second end (21) of the piston rod (2), and on which an injection pressure suitable for injecting the product is intended to be manually exerted; - a needle holder, intended to equip a distal part (10) to the manual pusher (4) of the syringe body (1); the syringe body (1) having a proximal part (11) to the manual pusher (4), opposite the distal part (10); - a gripping device according to claim 16.

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