Manual syringe with double grip 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) with respect to the manual pusher (4); a proximal portion (11) with respect to the manual pusher (4), opposite the distal portion (10), and provided with a holding wing (5) defining a holding position; characterized in that the proximal portion (11) of the syringe body (1) with respect to the manual pusher (4) is provided with an additional holding wing (6) arranged at a distance from the holding wing (5) in the direction of product injection, to define an additional holding position.

Description

Technical Field

[0001] This invention relates to the technical field of manual syringes, specifically syringes with a pusher that allows a medical professional to manually apply injection pressure.

[0002] This invention is particularly applicable to injectable viscoelastic gels (e.g., hyaluronic acid-based gels), for example in the fields of anti-aging and medical aesthetics. Background Technology

[0003] Manual injectors known in the prior art include:

[0004] - A cylindrical body used to receive the product to be injected;

[0005] - A plunger, mounted to be able to slide inside the barrel in the direction of product injection and in the opposite direction, and having opposing first and second ends;

[0006] - A stop is provided at the first end of the plunger;

[0007] - A manual pusher, located at the second end of the plunger, on which an injection pressure suitable for the injected product is manually applied;

[0008] The cylinder has:

[0009] The distal portion of the manual pusher is used to mount the needle seat;

[0010] The proximal portion of the manual pusher, opposite to the distal portion, is provided with a gripping wing that defines the gripping position.

[0011] This type of manual syringe is not entirely satisfactory when the product to be injected requires considerable pressure to be applied to the plunger. This is especially true when the product to be injected is a viscoelastic gel based on hyaluronic acid, sometimes requiring a force exceeding 50 N. Therefore, medical professionals (such as physicians) may experience some discomfort or even pain when repeatedly using this type of manual syringe.

[0012] Specifically, for the same volume, a manual syringe can be designed with an elongated and narrowed barrel and plunger to reduce the surface area in contact with the product to be injected, thereby reducing the force required to inject the product. However, elongating and narrowing the plunger can also cause discomfort for medical professionals. This discomfort in holding the syringe is particularly noticeable at the start of injection, when the second end of the plunger (where the manual pusher is located) is quite a distance from the grip fins.

[0013] Furthermore, the gripping wings are finger gripping wings designed to be held with a pincer-like grip. At least two fingers of the hand (excluding the thumb), typically the index and middle fingers, grasp the gripping wings, while the thumb (or palm) applies counter-pressure on the manual pusher to inject the product. As the injection proceeds, the healthcare professional's hand gradually closes, meaning the thumb (or palm) gradually moves closer to the fingers grasping the gripping wings. Between the start and end of the injection, the difference in distance between the thumb (or palm) and fingers in the gripping position (hereinafter referred to as the separation distance) can be significant. The longer the barrel, the greater this difference in separation distance. However, it has been found that significant differences in separation distance can easily lead to injection inconsistencies, especially at the end of the injection. These injection inconsistencies can be detrimental to certain procedures for cosmetic and / or medical purposes. As a non-limiting example, the injection of wrinkles into a patient requires extremely good consistency and stability to achieve the desired precision (potentially on the order of ±1 mm) and to effectively and reliably reach the patient's wrinkles.

[0014] Therefore, those skilled in the art need a manual syringe that can reduce discomfort for medical professionals at the start of an injection and / or reduce injection inconsistencies at the end of an injection. Summary of the Invention

[0015] This invention aims to overcome all or some of the aforementioned shortcomings. Therefore, this invention relates to a manual syringe, comprising:

[0016] - A cylindrical body used to receive the product to be injected;

[0017] - A plunger, installed to be able to slide inside the barrel in the direction of product injection and in the opposite direction, and having opposing first and second ends;

[0018] - A stop is provided at the first end of the plunger;

[0019] - A manual pusher, located at the second end of the plunger, on which an injection pressure suitable for the injected product is manually applied;

[0020] The cylinder has:

[0021] The distal part of the manual pusher is used to install the needle seat;

[0022] The proximal portion of the manual pusher is opposite to the distal portion and has a gripping wing that defines the gripping position;

[0023] It is worth noting that the portion of the barrel near the manual pusher is provided with an additional gripping wing, which is arranged at a distance from the gripping wing along the injection direction of the product to define the additional gripping position.

[0024] Therefore, compared to the prior art, this manual syringe according to the invention reduces discomfort experienced by medical professionals at the start of injection and reduces injection inconsistencies at the end of injection, achieved through such an additional grip wing. The first component includes a manual pusher and a grip wing, allowing for gripping with a first pincer-like finger used at the start of injection. The second component includes a manual pusher and an additional grip wing, allowing for gripping with a second pincer-like finger used at the end of injection. Compared to the prior art, such an additional grip wing allows for a reduction in the degree of difference in separation distance throughout the injection process, making it more comfortable for medical professionals and improving operational precision. As defined above, the separation distance is the distance between the thumb (or palm) located on the pusher and the fingers of the hand (excluding the thumb) in the gripping position on the wing. In other words, such an additional grip wing prevents the medical professional's hand from closing too much at the end of injection, as the medical professional can change their grip position by placing their fingers (excluding the thumb) on the additional grip wing to achieve a certain degree of hand opening at the end of injection. Compared to the prior art, this results in better stability and reduces the risk of injection inconsistencies.

[0025] The manual syringe according to the invention may have one or more of the following features.

[0026] According to one feature of the present invention:

[0027] - The cylinder extends along the longitudinal axis and has a length, denoted as L;

[0028] - The gripping wing and the additional gripping wing are spaced apart by a distance, denoted as h, along the longitudinal axis. This distance satisfies 20% L ≤ h ≤ 40% L.

[0029] Therefore, one advantage provided by this spacing between the gripping wings and the additional gripping wings is that a similar difference in separation distance is achieved between the gripping and additional gripping positions throughout the injection process. In other words, such a spacing allows the healthcare professional's hand to achieve a similar degree of closure in both the gripping position (initial injection phase) and the additional gripping position (final injection phase). Compared to existing technologies, this results in better stability and a reduced risk of injection inconsistencies.

[0030] According to one feature of the present invention:

[0031] - When the volume of the cylinder is 1ml to 5ml, the distance satisfies 20% L ≤ h ≤ 30% L, preferably 25% L ≤ h ≤ 30% L;

[0032] - When the volume of the cylinder is 5ml to 10ml, the distance satisfies 30% L ≤ h ≤ 40% L, preferably 35% L ≤ h ≤ 40% L.

[0033] Therefore, one advantage is that injection stability is improved by taking into account the barrel volume, thereby reducing the risk of injection inconsistencies in these barrel volumes.

[0034] According to one feature of the present invention:

[0035] - The cylinder extends along the longitudinal axis and has a diameter, denoted as Ø;

[0036] - The gripping wing and the additional gripping wing are spaced apart by a distance, denoted as h, along the longitudinal axis. This distance satisfies 140% Ø ≤ h ≤ 160% Ø.

[0037] Therefore, one advantage is that injection stability can be improved by taking the barrel diameter into account, thereby reducing the risk of injection inconsistency.

[0038] According to one feature of the present invention:

[0039] - When the volume of the cylinder is between 1 ml and 5 ml, the distance satisfies 140% Ø ≤ h ≤ 150% Ø;

[0040] - When the volume of the cylinder is 5ml to 10ml, the distance satisfies 150% Ø ≤ h ≤ 160% Ø.

[0041] Therefore, one advantage is that the risk of injection inconsistency is reduced by taking into account both the diameter and volume of the barrel.

[0042] According to one feature of the present invention:

[0043] - The cylinder extends along the longitudinal axis;

[0044] - The gripping wing defines a first gripping surface that is oriented toward the portion of the cylinder at the distal end of the manual pusher;

[0045] - An additional gripping wing defines a second gripping surface that is oriented toward the portion of the cylinder at the distal end of the manual pusher;

[0046] - The first and second gripping surfaces each extend along an axis perpendicular to the longitudinal axis.

[0047] Therefore, one advantage gained is improved injection stability.

[0048] According to one feature of the present invention:

[0049] - The gripping wing defines the first gripping surface;

[0050] - Additional grip wings define a second grip surface;

[0051] - The first and second gripping surfaces are convex and oriented toward the distal portion of the manual pusher of the cylinder.

[0052] Therefore, one advantage gained is enhanced comfort for medical professionals, as their fingers conform to the convex shape of the gripping surface as the hand gradually closes during injection. Specifically, as the hand gradually closes, the fingers on the gripping surface slightly bend and form a depression that conforms to the convex shape (raised area) of the gripping surface.

[0053] According to one feature of the present invention:

[0054] - The stop has a stroke end position inside the cylinder;

[0055] - The gripping wing defines a first gripping surface and an opposing concave second surface, the first gripping surface being oriented toward the distal portion of the manual pusher of the cylinder, and the concave second surface being oriented toward the proximal portion of the manual pusher of the cylinder;

[0056] - A manual pusher defines a first bearing surface and an opposing convex second surface, on which an injection pressure suitable for the injection product is manually applied, and the convex second surface is oriented toward the second surface of the gripping wing;

[0057] - The convex second surface of the manual pusher is designed to fit tightly with the concave second surface of the grip wing when the stop is at the end of its stroke.

[0058] Therefore, one advantage gained is a reduced distance between the thumb (or palm) located on the plunger and the fingers (excluding the thumb) of the hand in the wing-holding position. This results in greater comfort for the medical professional at the start of the injection, especially when the product to be injected requires significant pressure to be applied to the plunger.

[0059] According to one feature of the invention, the manual syringe includes a connecting member arranged to connect a gripping wing and an additional gripping wing, and mounted on the portion of the barrel proximal to the manual pusher.

[0060] Therefore, one advantage is that it is easier to attach the gripping wing and additional gripping wing to the barrel. Furthermore, such a connecting member helps improve injection stability. Specifically, the pincer grip is stable because the opposing sides of the index and middle fingers (the radial side of the middle finger and the ulnar side of the index finger) can abut against the connecting member. In other words, when the index and middle fingers are in the pincer grip position, the connecting member can fill the space between the index and middle fingers.

[0061] According to one feature of the present invention:

[0062] - The cylinder extends along the longitudinal axis;

[0063] - The portion of the cylinder near the manual pusher includes a flange that extends in a plane perpendicular to the longitudinal axis;

[0064] - The connecting member includes a groove arranged to interact with the flange so that:

[0065] The blocking connecting component translates along the longitudinal axis;

[0066] The blocking connecting member rotates about two axes that are perpendicular to each other and extend in a plane perpendicular to the longitudinal axis;

[0067] The connecting components are allowed to rotate about the longitudinal axis.

[0068] Therefore, one advantage is that the connecting components can be easily and reliably installed on the cylinder.

[0069] According to one feature of the present invention:

[0070] - The slots are arranged to interact with the flange along the insertion axis of the slots;

[0071] - The connecting member includes at least one shoulder that is designed to prevent the connecting member from translating along the insertion axis when it is mounted on the portion of the cylinder near the manual pusher.

[0072] Therefore, one advantage provided by such a shoulder is that the connecting member is easily held in a stable position along the insertion axis.

[0073] According to one feature of the present invention:

[0074] - The portion of the cylinder near the manual pusher includes graduations;

[0075] - The connecting member includes a hollow body designed to receive a cylindrical body, the hollow body having a non-enclosed connecting surface for connecting a gripping wing and an additional gripping wing, the non-enclosed connecting surface defining an opening designed to allow the scale to be seen.

[0076] According to one feature of the invention, the mechanical strength of the additional gripping wing is lower than that of the gripping wing.

[0077] According to one feature of the present invention:

[0078] - The gripping wings are made of the first material;

[0079] - The additional gripping wings are made of a second material with lower mechanical strength than the first material.

[0080] Therefore, one advantage gained is that the syringe is lighter.

[0081] According to one feature of the invention, the connecting member includes a flared portion facing the flared opening of the gripping wing, such that the mechanical strength of the additional gripping wing is lower than that of the gripping wing.

[0082] Therefore, one advantage provided by the flared section is that it provides mechanical reinforcement toward the gripping wing, which experiences the greatest force at the start of injection.

[0083] The present invention also relates to a gripping device for a manual syringe, the manual syringe comprising:

[0084] - A cylindrical body used to receive the product to be injected;

[0085] - A plunger, installed to be able to slide inside the barrel in the direction of product injection and in the opposite direction, and having opposing first and second ends;

[0086] - A stop is provided at the first end of the plunger;

[0087] - A manual pusher, located at the second end of the plunger, on which an injection pressure suitable for the injected product is manually applied;

[0088] The cylinder has:

[0089] The distal part of the manual pusher is used to install the needle seat;

[0090] The portion near the manual pusher is opposite to the distal portion;

[0091] The gripping device includes:

[0092] - Grip wings and additional grip wings;

[0093] - A connecting member is arranged to connect the gripping wing and the additional gripping wing, such that when the connecting member is mounted on the portion of the cylinder near the manual pusher, the additional gripping wing is arranged to be spaced apart from the gripping wing along the injection direction of the product.

[0094] The connecting member is sized such that when the connecting member is mounted on the portion of the cylinder near the manual pusher, the gripping wing defines the gripping position, and the additional gripping wing defines the additional gripping position.

[0095] As described above, compared to existing technologies, this additional grip wing reduces the degree of variation in separation distance throughout the injection process, making it more comfortable for healthcare professionals. As defined above, separation distance is the distance between the thumb (or palm) on the pusher and the fingers of the hand (excluding the thumb) in the gripping position on the wing. In other words, this additional grip wing prevents the healthcare professional's hand from closing too much at the end of the injection, as the healthcare professional can change their grip position by placing their fingers (excluding the thumb) on the additional grip wing to achieve a certain degree of hand opening at the end of the injection. This results in better stability and reduces the risk of injection inconsistencies compared to existing technologies.

[0096] The present invention also relates to a manual syringe, comprising:

[0097] - A cylindrical body used to receive the product to be injected;

[0098] - A plunger, installed to be able to slide inside the barrel in the direction of product injection and in the opposite direction, and having opposing first and second ends;

[0099] - A stop is provided at the first end of the plunger;

[0100] - A manual pusher, located at the second end of the plunger, on which an injection pressure suitable for the injected product is manually applied;

[0101] The cylinder has:

[0102] The portion at the distal end of the manual pusher is designed to mount the needle seat;

[0103] The portion near the manual pusher is opposite to the distal portion;

[0104] The manual syringe includes a gripping device according to the invention.

[0105] As described above, compared to the prior art, this manual syringe according to the invention enables healthcare professionals to reduce discomfort at the start of injection and decrease injection inconsistencies at the end of injection, achieved through the additional grip wings of the gripping device. A first component, including a manual pusher and grip wings, allows for a first pincer-like grip used at the start of injection. A second component, including a manual pusher and additional grip wings, allows for a second pincer-like grip used at the end of injection. Compared to the prior art, such additional grip wings allow for a reduction in the degree of difference in separation distance throughout the injection process, making it more comfortable for healthcare professionals. As defined above, separation distance is the distance between the thumb (or palm) located on the pusher and the fingers of the hand (excluding the thumb) in the gripping position on the wings. In other words, such additional grip wings prevent the healthcare professional's hand from closing too much at the end of injection, as the healthcare professional can change their grip position by placing their fingers (excluding the thumb) on the additional grip wings to achieve a certain degree of hand opening at the end of injection. Compared to the prior art, this results in better stability and a reduced risk of injection inconsistencies.

[0106] Finally, the present invention relates to an injection kit comprising:

[0107] - A cylindrical body used to receive the product to be injected;

[0108] - A plunger that can be installed to slide inside the barrel in the direction of product injection and in the opposite direction, and has opposing first and second ends;

[0109] - A stop, which may be arranged at the first end of the plunger;

[0110] - A manual pusher, located at the second end of the plunger, on which an injection pressure suitable for the injected product is manually applied;

[0111] - Needle seat, designed to mount the portion of the cylinder at the distal end of the manual pusher; the cylinder has a portion at the proximal end of the manual pusher, opposite the distal portion;

[0112] - A gripping device according to the present invention.

[0113] As described above, compared to existing technologies, the additional grip wings of the gripping device reduce the degree of variation in separation distance throughout the injection process, making it more comfortable for healthcare professionals. As defined above, separation distance is the distance between the thumb (or palm) located on the pusher and the fingers of the hand (excluding the thumb) in the gripping position on the wings. In other words, such additional grip wings prevent the healthcare professional's hand from closing too much at the end of the injection, as the healthcare professional can change their grip position by placing their fingers (excluding the thumb) on the additional grip wings to achieve a certain degree of hand opening at the end of the injection. This results in better stability and reduces the risk of injection inconsistencies compared to existing technologies.

[0114] definition

[0115] - "Manual syringe" refers to a manual syringe that includes a plunger on which injection pressure is manually applied (by the thumb or palm) to move the plunger to inject the product.

[0116] - "Far end" refers to the part of the cylinder that is furthest from the manual pusher.

[0117] - "Proximal section" refers to the part of the cylinder closest to the manual pusher.

[0118] - "Grip" refers to a pincer-like grip. At least two fingers of the hand (excluding the thumb), usually the index and middle fingers, grasp the grip wings or additional grip wings, while the thumb (or palm) applies counter-pressure on the manual pusher to inject the product.

[0119] - "Grip position (or additional grip position)" refers to the position of the grip wing (or additional grip wing) on ​​the barrel, which is adapted to allow fingers (using at least two fingers other than the thumb) to grip the corresponding wing. This finger grip is a pincer grip, with the thumb or palm applying counter-pressure on the manual pusher to inject the product.

[0120] - "Arranged at a distance along the injection direction of the product" means that the additional gripping wings are spaced apart from the gripping wings along the barrel. The injection direction of the product is defined as from the proximal to the distal portion of the barrel. The distance between the gripping wings and the additional gripping wings is quantified from center to center along the longitudinal axis of the barrel, that is, between the intersection of the longitudinal axis of the barrel and the corresponding gripping wing.

[0121] - "Concave" refers to a curved surface forming a depression. The orientation of a concave surface corresponds to the orientation of its curvature. A concave surface oriented towards element A means that the curvature of the concave surface is turned (pointing) towards element A.

[0122] - "Convex" refers to a curved surface that forms a bulge or protrusion. The orientation of a convex surface corresponds to the orientation of its curvature. A convex surface oriented towards element A means that the curvature of the convex surface is turned (pointed) towards element A.

[0123] - "Flanged portion" refers to the wider part at one end of the connecting member. The flared portion of the connecting member faces the grip wing flare, which means that the wider end of the connecting member is oriented towards the grip wing (pointing towards the grip wing). Attached Figure Description

[0124] Other features and advantages will become apparent from the detailed description of various embodiments of the present invention (which includes examples and reference to the accompanying drawings).

[0125] Figure 1 This is a schematic perspective view of a manual syringe according to the present invention.

[0126] Figure 2 This is a partial schematic perspective view of a manual syringe according to the present invention, depicting a plunger provided with a stop and a pusher.

[0127] Figure 3 This is a partial schematic perspective view of a manual syringe according to the present invention, depicting a gripping wing and an additional gripping wing mounted on the barrel.

[0128] Figure 4 This is a schematic perspective view of the gripping device according to the present invention. Figure 4 The image depicts gripping wings and additional gripping wings connected to each other via connecting members. The connecting members are intended to be mounted on the portion of the cylinder near the manual pusher.

[0129] Figure 5 It is shown from another perspective, similar to Figure 4 A schematic diagram.

[0130] Figure 6 It is similar to being shown from the front. Figure 4 A schematic diagram.

[0131] Figure 7 This is a schematic perspective view of a manual syringe according to the present invention, depicting a... Figure 1 A larger cylinder.

[0132] Figure 8 This is a partial schematic perspective view of a manual syringe according to the present invention, depicting a plunger provided with a stop and a pusher, for mounting in a... Figure 1 Inside a larger cylinder.

[0133] Figure 9 This is a partial schematic perspective view of a manual syringe according to the present invention, depicting an assembly installed (compared to...) Figure 1The larger (in the cylinder) has grip wings and additional grip wings.

[0134] Figure 10 This is a schematic perspective view of the gripping device according to the present invention. Figure 10 The image depicts gripping wings and additional gripping wings connected to each other via connecting members. The connecting members are intended to be mounted on (amounts greater than...) Figure 1 The larger part of the cylinder is located on the section near the manual pusher.

[0135] Figure 11 It is similar to being shown from the front. Figure 10 A schematic diagram.

[0136] Note that the above figures are schematic and not necessarily drawn to scale for clarity and ease of understanding. Detailed Implementation

[0137] For simplicity, elements that are the same or perform the same function in the various embodiments will have the same reference numerals.

[0138] Manual syringe

[0139] This invention relates to a manual syringe, comprising:

[0140] - Cylinder 1, used to receive the product to be injected;

[0141] - A plunger 2, installed to be able to slide inside the barrel 1 in the direction of product injection and in the opposite direction, and having opposing first and second ends 20, 21;

[0142] - Stop 3, arranged at the first end 20 of plunger 2;

[0143] - Manual pusher 4, arranged at the second end 21 of plunger 2, on which injection pressure suitable for the injection product is manually applied;

[0144] Cylinder 1 has:

[0145] The portion 10 at the distal end of the manual pusher 4 is used to install the needle seat;

[0146] The manual pusher 4 has a gripping wing 5 at its proximal end 11, opposite to the distal end 10, which defines the gripping position.

[0147] The feature is that the portion 11 of the cylinder 1 near the manual pusher 4 is provided with an additional gripping wing 6, which is arranged at a distance from the gripping wing 5 along the injection direction of the product in order to define the additional gripping position.

[0148] cylinder

[0149] The cylinder 1 is used to receive the product to be injected. The product to be injected is preferably a viscous product, more preferably a viscoelastic gel, and even more preferably a viscoelastic gel based on hyaluronic acid.

[0150] The cylinder 1 is preferably cylindrical. The cylinder 1 may extend along a longitudinal axis X'-X. The cylinder 1 may have a length, denoted by L. The cylinder 1 may have a diameter, denoted by Ø. As a non-limiting example, the volume of the cylinder 1 may be from 1 ml to 10 ml. In particular, it is also conceivable that the volume of the cylinder 1 is greater than 10 ml.

[0151] The portion 10 at the distal end of the manual pusher 4 of the cylinder 1 is used to mount the needle hub. This portion 10 is located at the first end of the cylinder 1. The first end of the cylinder 1 is open to receive the needle hub. Figures 1 to 7 As shown, without the needle seat, the portion 10 of the cylinder 1 at the distal end of the manual pusher 4 can be closed with a cap 100. In other words, the first end of the cylinder 1 can be closed with a cap 100.

[0152] The portion 11 of the cylinder 1, opposite the distal portion 10, proximal to the manual pusher 4, is provided with a gripping wing 5. This portion 11 of the cylinder 1 proximal to the manual pusher 4 is located at the second end of the cylinder 1 opposite the first end. The second end of the cylinder 1 is open to receive the plunger 2. In other words, the portion 11 of the cylinder 1 proximal to the manual pusher 4 is open to receive the plunger 2. The portion 11 of the cylinder 1 proximal to the manual pusher 4 advantageously includes a flange 110 extending in a plane perpendicular to the longitudinal axis X'-X along which the cylinder 1 extends. The portion 11 of the cylinder 1 proximal to the manual pusher 4 advantageously includes a scale. The scale is arranged to measure the volume of the product to be injected.

[0153] The cylinder 1 is preferably made of plastic, more preferably of thermoplastic. As a non-limiting example, the cylinder 1 may be made of polycarbonate.

[0154] plunger

[0155] The plunger 2 is mounted to slide within the barrel 1 in the direction of product injection and in the opposite direction. The direction of product injection is defined as from the portion 11 of the barrel 1 proximal to the manual pusher 4 to the portion 10 of the barrel 1 distal to the manual pusher 4. The plunger 2 has opposing first and second ends 20, 21. The plunger 2 may include a plunger head 200 disposed at the first end 20 of the plunger 2, and the plunger head 200 is designed to interact with the stop 3. The plunger 2 and the plunger head 200 are advantageously integral. The plunger head 200 may be a snap-fit ​​head designed to interact with the stop 3 via a resilient snap. According to possible alternatives, the plunger head 200 may interact with the stop 3 by screwing or by inserting.

[0156] The plunger 2 is preferably made of plastic, more preferably of thermoplastic. As a non-limiting example, the plunger 2 may be made of polycarbonate.

[0157] Stop

[0158] A stop 3 is disposed at the first end 20 of the plunger 2. The stop 3 may have an elastically deformable inner wall defining a cavity. "Inner wall" refers to the inner surface of the cavity defining the stop 3, which is hollow. "Elastically deformable" means that the inner wall of the stop 3 can reversibly deform under mechanical stress (below the elastic limit), i.e., when the mechanical stress ceases, the inner wall of the stop 3 can return to its initial shape. The plunger head 200 may form a snap-fit ​​head, allowing the stop 3 to be attached to the first end 20 of the plunger 2 via an elastic snap. As a non-limiting example, the stop 3 may be made of an elastomer, such as chlorinated or brominated butyl rubber.

[0159] According to the alternative, the stop 3 can be rigid and without an internal cavity (i.e., not hollow). Where appropriate, the stop 3 can be attached to the first end 20 of the plunger 2 by screwing or by embedding.

[0160] The stop 3 has a stroke end position inside the cylinder 1.

[0161] Manual push-button

[0162] A manual pusher 4 is located at the second end 21 of the plunger 2. Pressure is manually applied to the manual pusher 4 by a medical professional to inject the product.

[0163] The manual pusher 4 and the plunger 2 are advantageously integrated. The manual pusher 4 is advantageously rigid, in other words, it is not deformable under normal operating conditions, such as at ambient temperature (20°C to 30°C) and atmospheric pressure.

[0164] Manual push-button 4 is limited:

[0165] - A first bearing surface 40, suitable for manually applying injection pressure to the injected product; and

[0166] - The opposite convex second surface 41.

[0167] The second surface 41 of the manual pusher 4 is opposite to the first bearing surface 40.

[0168] Grip Wing

[0169] The gripping wing 5 is arranged on the portion 11 of the cylinder 1 near the manual pusher 4, and is positioned to define the gripping position. The gripping wing 5 forms a lateral extension protruding from the cylinder 1. Advantageously, the gripping wing 5 is integral.

[0170] The grip wing 5 defines a first grip surface 50 oriented toward the distal portion 10 of the cylinder 1 in the manual pusher 4. The grip wing 5 may have an opposing concave second surface 51 oriented toward the proximal portion 11 of the cylinder 1 in the manual pusher 4. The second surface 51 of the grip wing 5 is opposite to the first grip surface 50.

[0171] The convex second surface 41 of the manual pusher 4 (oriented opposite to the first bearing surface 40 and toward the second surface 51 of the gripping wing 5) is advantageously designed to fit tightly with the concave second surface 51 of the gripping wing 5 when the stop 3 is at the end of its stroke.

[0172] Additional grip wings

[0173] An additional gripping wing 6 is arranged on the portion 11 of the barrel 1 near the manual pusher 4, at a distance from the gripping wing 5, and is positioned to define the additional gripping position. More specifically, the additional gripping wing 6 is arranged at a distance from the gripping wing 5 along the injection direction of the product. The additional gripping wing 6 forms a lateral extension protruding from the barrel 1. Advantageously, the additional gripping wing 6 is integral.

[0174] The gripping wing 5 and the additional gripping wing 6 are spaced apart by a distance, denoted as "h", along the longitudinal axis X'-X (along which the cylinder 1 extends), and the distance "h" advantageously satisfies 20% L ≤ h ≤ 40% L, where "L" is the length of the cylinder 1 along the longitudinal axis X'-X. When the volume of the cylinder 1 is 1 ml to 5 ml, the distance "h" can satisfy 20% L ≤ h ≤ 30% L, preferably 25% L ≤ h ≤ 30% L. When the volume of the cylinder 1 is 5 ml to 10 ml, the distance "h" can satisfy 30% L ≤ h ≤ 40% L, preferably 35% L ≤ h ≤ 40% L.

[0175] The distance "h" preferably satisfies 140% Ø ≤ h ≤ 160% Ø, where "Ø" is the diameter of cylinder 1. When the volume of cylinder 1 is 1 ml to 5 ml, the distance "h" satisfies 140% Ø ≤ h ≤ 150% Ø. When the volume of cylinder 1 is 5 ml to 10 ml, the distance "h" satisfies 150% Ø ≤ h ≤ 160% Ø.

[0176] An additional grip wing 6 defines a second grip surface 60, which is oriented toward the portion 10 of the cylinder 1 distal to the manual pusher 4. The first grip surface 50 (belonging to the grip wing 5) and the second grip surface 60 (belonging to the additional grip wing 6) advantageously each extend along an axis perpendicular to the longitudinal axis X'-X (along which the cylinder 1 extends). The first and second grip surfaces 50, 60 are advantageously convex, oriented toward the portion 10 of the cylinder 1 distal to the manual pusher 4. In other words, the lateral profiles of the first and second grip surfaces 50, 60 (i.e., perpendicular to the longitudinal axis X'-X, along which the cylinder 1 extends) advantageously form convex surfaces. The area of ​​the second grip surface 60 (belonging to the additional grip wing 6) may be smaller than the area of ​​the first grip surface 50 (belonging to the grip wing 5). As a non-limiting example, the area of ​​each of the first gripping surface and the second gripping surfaces 50 and 60 can be 400 mm². 2 Up to 950mm 2 Preferably, when the volume of the cylinder 1 is 1ml to 5ml, it is 600mm. 2 Up to 750mm 2 When the volume of cylinder 1 is 5ml to 10ml, it is preferably 750mm. 2 Up to 950mm 2 .

[0177] The mechanical strength of the additional gripping wing 6 is advantageously lower than that of the gripping wing 5. Example according to the embodiment:

[0178] - The gripping wing 5 is made of the first material;

[0179] - The additional gripping wing 6 is made of a second material with lower mechanical strength than the first material.

[0180] As a non-limiting example, the first material of the gripping wing 5 can be a material with a Young's modulus of 900 MPa to 1600 MPa, such as a thermoplastic. The second material of the additional gripping wing 6 can be a material with a Young's modulus of 1 MPa to 2 MPa, such as an elastomer. "Young's modulus" refers to Young's modulus in the strict sense, or, in the case of an elastomer, the modulus at 100%.

[0181] According to an alternative, the gripping wing 5 and the additional gripping wing 6 are made of the same material. The additional gripping wing 6 can then have a different geometry than the gripping wing 5, resulting in a lower mechanical strength than the gripping wing 5. One possibility for the different geometry is to reduce the gripping surface 60 of the additional gripping wing 6 relative to the gripping surface 50 of the gripping wing 5, so that the mechanical strength of the additional gripping wing 6 is lower than that of the gripping wing 5.

[0182] Connecting components

[0183] The manual syringe advantageously includes a connecting member 7 arranged to connect the gripping wing 5 and the additional gripping wing 6. The connecting member 7 is mounted on a portion 11 of the barrel 1 proximal to the manual pusher 4. The connecting member 7, the gripping wing 5, and the additional gripping wing 6 can be integral. When the gripping wing 5 and the additional gripping wing 6 are made of different first and second materials, the connecting member 7 can be manufactured by dual-injection (dual-material) injection molding. Alternatively, the connecting member 7 and the gripping wing 5 can be integral. Where appropriate, the additional gripping wing 6 is mounted on the connecting member 7, for example, by an insert connection or snap-fit ​​engagement.

[0184] The connecting member 7 advantageously includes a groove 70 arranged to interact with the flange 110 such that:

[0185] - The blocking connecting member 7 is translated along the longitudinal axis X'-X (the cylinder 1 extends along the longitudinal axis X'-X);

[0186] - The blocking connecting member 7 rotates about two axes that are perpendicular to each other and extend in a plane (the flange 110 extends in the plane) that is perpendicular to the longitudinal axis X'-X (along which the cylinder 1 extends);

[0187] - Allows the connecting member 7 to rotate about the longitudinal axis X'-X (along which the cylinder 1 extends).

[0188] The groove 70 is advantageously arranged to interact with the flange 110 along the insertion axis of the flange 110 into the groove 70. The connecting member 7 advantageously includes at least one shoulder 71, which is designed to prevent the connecting member 7 from translating along the insertion axis when the connecting member 7 is mounted on the portion 11 of the cylinder 1 near the manual pusher 4.

[0189] The connecting member 7 advantageously includes a hollow body 72 designed to receive the cylindrical body 1. Advantageously, at least one shoulder 71 extends along the hollow body 72 along an axis parallel to the longitudinal axis X'-X, and the cylindrical body 1 extends along the longitudinal axis X'-X. The hollow body 72 of the connecting member 7 advantageously has a non-enclosed connecting surface 720 connecting the gripping wing 5 and an additional gripping wing 6. The non-enclosed connecting surface 720 advantageously defines an opening 721 designed to allow visibility of graduations that may be provided on the portion 11 of the cylindrical body 1 near the manual pusher 4. The non-enclosed connecting surface 720 advantageously is designed to fit snugly to the shape of the cylindrical body 1.

[0190] The connecting member 7 may include a flared portion 73 flaring toward the gripping wing 5, such that the mechanical strength of the additional gripping wing 6 is lower than that of the gripping wing 5. This embodiment may be preferred for large-volume cylinders 1, such as 10 ml.

[0191] Handling device for manual syringes

[0192] This invention relates to a gripping device for a manual syringe. The gripping device is designed to equip a manual syringe, which includes:

[0193] - Cylinder 1, used to receive the product to be injected;

[0194] - A plunger 2, mounted to allow it to slide inside the barrel 1 in the direction of product injection and in the opposite direction, and having opposing first and second ends 20, 21;

[0195] - Stop 3, arranged at the first end 20 of plunger 2;

[0196] - A manual pusher 4 is arranged at the second end 21 of the plunger 2, on which an injection pressure suitable for the injection product is manually applied.

[0197] Cylinder 1 has:

[0198] - The portion 10 at the distal end of the manual pusher 4 is used to install the needle seat;

[0199] - The portion 11 at the proximal end of the manual pusher 4 is opposite to the distal portion 10.

[0200] The cylinder 1 is used to receive the product to be injected. The product to be injected is preferably a viscous product, more preferably a viscoelastic gel, and even more preferably a viscoelastic gel based on hyaluronic acid.

[0201] The cylinder 1 is preferably cylindrical. The cylinder 1 may extend along a longitudinal axis X'-X. The cylinder 1 may have a length, denoted by L. The cylinder 1 may have a diameter, denoted by Ø. As a non-limiting example, the volume of the cylinder 1 may be from 1 ml to 10 ml. In particular, it is also conceivable that the volume of the cylinder 1 may be greater than 10 ml. The portion 11 of the cylinder 1 proximal to the manual pusher 4 advantageously includes a flange 110 extending in a plane perpendicular to the longitudinal axis X'-X along which the cylinder 1 extends. The portion 11 of the cylinder 1 proximal to the manual pusher 4 advantageously includes a scale. The scale is arranged to measure the volume of the product to be injected.

[0202] The gripping device according to the present invention includes:

[0203] - Grip wing 5 and additional grip wing 6;

[0204] - Connecting member 7, arranged to connect gripping wing 5 and additional gripping wing 6, such that when connecting member 7 is installed on portion 11 of the cylinder 1 near the manual pusher 4, additional gripping wing 6 is arranged to be spaced apart from gripping wing 5 along the injection direction of the product.

[0205] The connecting member 7 is sized such that when the connecting member 7 is mounted on the portion 11 of the cylinder 1 near the manual pusher 4, the gripping wing 5 defines the gripping position, and the additional gripping wing 6 defines the additional gripping position.

[0206] The connecting member 7 is advantageously sized such that when the connecting member 7 is mounted on the portion 11 of the cylinder 1 near the manual pusher 4, the gripping wing 5 and the additional gripping wing 6 are spaced apart by a distance, denoted as “h”, along the longitudinal axis X’-X (along which the cylinder 1 extends). The connecting member 7 is advantageously sized such that the distance “h” satisfies 20% L ≤ h ≤ 40% L, where “L” is the length of the cylinder 1 along the longitudinal axis X’-X. When the volume of the cylinder 1 is 1 ml to 5 ml, the distance “h” can satisfy 20% L ≤ h ≤ 30% L, preferably 25% L ≤ h ≤ 30% L. When the volume of the cylinder 1 is 5 ml to 10 ml, the distance “h” can satisfy 30% L ≤ h ≤ 40% L, preferably 35% L ≤ h ≤ 40% L.

[0207] The connecting member 7 is advantageously sized such that the distance “h” satisfies 140% Ø ≤ h ≤ 160% Ø, where “Ø” is the diameter of the cylinder 1. When the volume of the cylinder 1 is 1 ml to 5 ml, the distance “h” can satisfy 140% Ø ≤ h ≤ 150% Ø. When the volume of the cylinder 1 is 5 ml to 10 ml, the distance “h” can satisfy 150% Ø ≤ h ≤ 160% Ø.

[0208] The connecting member 7 advantageously includes a groove 70 arranged to interact with the flange 110 such that:

[0209] - The blocking connecting member 7 translates along the longitudinal axis X'-X (the cylinder 1 extends along the longitudinal axis X'-X); - The blocking connecting member 7 rotates about two axes that are perpendicular to each other and extend in a plane (the flange 110 extends in the plane) that is perpendicular to the longitudinal axis X'-X (the cylinder 1 extends along the longitudinal axis X'-X);

[0210] - Allows the connecting member 7 to rotate about the longitudinal axis X'-X (along which the cylinder 1 extends).

[0211] The slot 70 is advantageously arranged to interact with the flange 110 along the insertion axis of the slot 70. The connecting member 7 advantageously includes at least one shoulder 71, which is designed to prevent the connecting member 7 from translating along the insertion axis when the connecting member 7 is mounted on the portion 11 of the cylinder 1 near the manual pusher 4.

[0212] The connecting member 7 advantageously includes a hollow body 72 designed to receive the cylindrical body 1. Advantageously, at least one shoulder 71 extends along the hollow body 72 along an axis parallel to the longitudinal axis X'-X, along which the cylindrical body 1 extends. The hollow body 72 of the connecting member 7 advantageously has a non-enclosed connecting surface 720 connecting the gripping wing 5 and the additional gripping wing 6. The non-enclosed connecting surface 720 advantageously defines an opening 721 designed to allow visibility of graduations that may be provided on the portion 11 of the cylindrical body 1 near the manual pusher 4.

[0213] The connecting member 7 may include a flared portion 73 that flares out toward the gripping wing 5, such that the mechanical strength of the additional gripping wing 6 is lower than that of the gripping wing 5.

[0214] The present invention also relates to a manual syringe equipped with such a gripping device.

[0215] Injection kit

[0216] This invention relates to an injection kit, comprising:

[0217] - Cylinder 1, used to receive the product to be injected;

[0218] - A plunger 2, which can be installed to slide inside the cylinder 1 in the direction of product injection and in the opposite direction, and has opposing first and second ends 20, 21;

[0219] - Stop 3, which can be arranged at the first end 20 of plunger 2;

[0220] - Manual pusher 4, arranged at the second end 21 of plunger 2, on which injection pressure suitable for the injection product is manually applied;

[0221] - Needle seat, designed to mount the portion 10 of the cylinder 1 at the distal end of the manual pusher 4; the cylinder 1 has a portion 11 at the proximal end of the manual pusher 4, opposite to the distal portion 10;

[0222] - A gripping device according to the present invention.

[0223] This invention is not limited to the disclosed embodiments. Those skilled in the art will be able to consider technically feasible combinations therein and replace equivalents therewith.

Claims

1. A manual syringe, comprising: - Cylinder (1), used to receive the product to be injected; - A plunger (2), installed to allow it to slide inside the barrel (1) in the direction of product injection and in the opposite direction, and having opposing first and second ends (20, 21); - A stop (3) is arranged at the first end (20) of the plunger (2); - A manual pusher (4) is arranged at the second end (21) of the plunger (2) to manually apply an injection pressure suitable for the injection product; The cylinder (1) has: The portion (10) at the distal end of the manual pusher (4) is designed to mount the needle seat; In the proximal portion (11) of the manual pusher (4), opposite to the distal portion (10), there is a gripping wing (5) that defines the gripping position; The feature is that the portion (11) of the cylinder near the manual pusher (4) is provided with an additional gripping wing (6), the additional gripping wing (6) being arranged at a distance from the gripping wing (5) along the injection direction of the product, thereby defining the additional gripping position.

2. The manual syringe according to claim 1, wherein: - The cylinder (1) extends along the longitudinal axis (X'-X) and has a length, denoted as L; - The gripping wing (5) and the additional gripping wing (6) are spaced apart by a distance h along the longitudinal axis (X'-X), which satisfies 20%L ≤ h ≤ 40%L.

3. The manual syringe according to claim 2, wherein: - When the volume of the cylinder (1) is 1 ml to 5 ml, the distance satisfies 20% L ≤ h ≤ 30% L, preferably 25% L ≤ h ≤ 30% L; - When the volume of the cylinder (1) is 5ml to 10ml, the distance satisfies 30% L ≤ h ≤ 40% L, preferably 35% L ≤ h ≤ 40% L.

4. The manual syringe according to any one of claims 1 to 3, wherein: - The cylinder (1) extends along the longitudinal axis (X'-X) and has a diameter, denoted as Ø; - The gripping wing (5) and the additional gripping wing (6) are spaced apart by a distance h along the longitudinal axis (X'-X), which satisfies 140%Ø ≤ h ≤ 160%Ø.

5. The manual syringe according to claim 4, wherein: - When the volume of the cylinder (1) is 1 ml to 5 ml, the distance satisfies 140% Ø ≤ h ≤ 150% Ø; - When the volume of the cylinder (1) is 5ml to 10ml, the distance satisfies 150% Ø ≤ h ≤ 160% Ø.

6. The manual syringe according to any one of claims 1 to 5, wherein: - The cylinder (1) extends along the longitudinal axis (X'-X); - The gripping wing (5) defines a first gripping surface (50), which is oriented toward the portion (10) of the cylinder (1) at the distal end of the manual pusher (4); - An additional gripping wing (6) defines a second gripping surface (60), which is oriented toward the portion (10) of the cylinder (1) at the distal end of the manual pusher (4); - The first gripping surface and the second gripping surface (50, 60) each extend along an axis perpendicular to the longitudinal axis (X'-X).

7. The manual syringe according to any one of claims 1 to 6, wherein: - The gripping wing (5) defines the first gripping surface (50); - An additional gripping wing (6) defines a second gripping surface (60); - The first gripping surface and the second gripping surface (50, 60) are convex and oriented toward the portion (10) at the distal end of the manual pusher (4) of the cylinder (1).

8. The manual syringe according to any one of claims 1 to 7, wherein: - The stop (3) has a stroke end position inside the cylinder (1); - The gripping wing (5) defines a first gripping surface (50) and an opposing concave second surface (51), the first gripping surface (50) being oriented toward the portion (10) of the cylinder (1) at the distal end of the manual pusher (4), and the concave second surface (51) being oriented toward the portion (11) of the cylinder (1) at the proximal end of the manual pusher (4). - A manual pusher (4) defines a first bearing surface (40) and an opposing convex second surface (41), on which an injection pressure suitable for the injection product is manually applied, the convex second surface (41) being oriented toward the second surface (51) of the grip wing (5); - The convex second surface (41) of the manual pusher (4) is designed to fit closely with the concave second surface (51) of the gripping wing (5) when the stop (3) is at the end of its stroke.

9. The manual syringe according to any one of claims 1 to 8, comprising a connecting member (7) arranged to connect a gripping wing (5) and an additional gripping wing (6), and mounted on a portion (11) of the barrel (1) proximal to the manual pusher (4).

10. The manual syringe according to claim 9, wherein: - The cylinder (1) extends along the longitudinal axis (X'-X); - The portion (11) of the cylinder (1) near the manual pusher (4) includes a flange (110) that extends in a plane perpendicular to the longitudinal axis (X'-X); - The connecting member (7) includes a groove (70) arranged to interact with the flange (110) such that: The blocking connecting member (7) translates along the longitudinal axis (X'-X); The blocking connecting member (7) rotates about two axes that are perpendicular to each other and extend in a plane perpendicular to the longitudinal axis (X'-X); The connecting member (7) is allowed to rotate about the longitudinal axis (X'-X).

11. The manual syringe according to claim 10, wherein: - The slot (70) is arranged to be inserted along the flange (110) and the insertion axis of the slot (70) interacts with the flange (110); - The connecting member (7) includes at least one shoulder (71) which is designed to prevent the connecting member (7) from translating along the insertion axis when the connecting member (7) is mounted on the portion (11) of the cylinder (1) near the manual pusher (4).

12. The manual syringe according to any one of claims 9 to 11, wherein: - The portion (11) of the cylinder (1) near the manual pusher (4) includes a scale; - The connecting member (7) includes a hollow body (72) designed to receive the cylindrical body (1), the hollow body (72) having a non-enclosed connecting surface (720) for connecting the gripping wing (5) and an additional gripping wing (6), the non-enclosed connecting surface (720) defining an opening (721) designed to allow the scale to be seen.

13. The manual syringe according to any one of claims 1 to 12, wherein the mechanical strength of the additional gripping wing (6) is lower than that of the gripping wing (5).

14. The manual syringe according to claim 13, wherein: - The gripping wing (5) is made of the first material; - The additional gripping wing (6) is made of a second material with lower mechanical strength than the first material.

15. The manual syringe according to claim 13 and in conjunction with claim 9, wherein the connecting member (7) includes a flared portion (73) flared toward the gripping wing (5) such that the mechanical strength of the additional gripping wing (6) is lower than that of the gripping wing (5).

16. A gripping device for a manual syringe, the manual syringe comprising: - A cylindrical body (1) designed to receive the product to be injected; - A plunger (2) is installed to be able to slide inside the barrel (1) in the direction of product injection and in the opposite direction, and has opposing first and second ends (20, 21); - A stop (3) is arranged at the first end (20) of the plunger (2); - A manual pusher (4) is arranged at the second end (21) of the plunger (2), on which an injection pressure suitable for the injection product is manually applied; The cylinder (1) has: The portion (10) at the distal end of the manual pusher (4) is used to mount the needle seat; The portion (11) near the manual pusher (4) is opposite to the distal portion (10); The gripping device includes: - Grip wings (5) and additional grip wings (6); - A connecting member (7) is arranged to connect the gripping wing (5) and the additional gripping wing (6) such that when the connecting member (7) is mounted on the portion (11) of the cylinder (1) near the manual pusher (4), the additional gripping wing (6) is arranged to be spaced apart from the gripping wing (5) by a distance along the injection direction of the product. The connecting member (7) is sized such that when the connecting member (7) is mounted on the portion (11) of the cylinder (1) near the manual pusher (4), the gripping wing (5) defines the gripping position, and the additional gripping wing (6) defines the additional gripping position.

17. A manual syringe, comprising: - A cylindrical body (1) designed to receive the product to be injected; - A plunger (2), installed to allow it to slide inside the barrel (1) in the direction of product injection and in the opposite direction, and having opposing first and second ends (20, 21); - A stop (3) is arranged at the first end (20) of the plunger (2); - A manual pusher (4) is arranged at the second end (21) of the plunger (2), on which an injection pressure suitable for the injection product is manually applied; The cylinder (1) has: The portion (10) at the distal end of the manual pusher (4) is designed to mount the needle seat; The portion (11) near the manual pusher (4) is opposite to the distal portion (10); The manual syringe includes the gripping device according to claim 16.

18. An injection kit comprising: - A cylindrical body (1) designed to receive the product to be injected; - A plunger (2) that can be installed such that it can slide inside the barrel (1) in the direction of product injection and in the opposite direction, and has opposing first and second ends (20, 21); - A stop (3) that can be arranged at the first end (20) of the plunger (2); - A manual pusher (4) is arranged at the second end (21) of the plunger (2), on which an injection pressure suitable for the injection product is manually applied; - A needle holder, designed to mount the portion (10) of the cylinder (1) at the distal end of the manual pusher (4); the cylinder (1) has a portion (11) at the proximal end of the manual pusher (4), opposite to the distal portion (10); - The gripping device according to claim 16.

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