RU2783499C2 - Syringe, syringe handle, case - Google Patents

Abstract

FIELD: medical equipment.

SUBSTANCE: present invention relates to medical equipment, namely to a syringe containing case (1) and handle (4) designed for the interaction with each other in order to provide a mutual fixation of case (1) and handle (4). Injection syringe case (1) contains longitudinal sleeve (2) containing at least one enclosing or enclosed retaining means (26) and a protective shell capable of moving along longitudinal sleeve (2) and capable of closing, in a retracted position, at least one retaining means (26) of longitudinal sleeve (2). Syringe handle (4) contains at least one enclosing or enclosed retaining means (8) designed for the interaction with at least one enclosing or enclosed retaining means (26) of longitudinal sleeve (2) to provide the retention function, while the mentioned interaction is a fixation position. The syringe additionally contains at least one locking device (7), which provides the radial retention function, when both the retracted position and the fixation position are activated.

EFFECT: obtaining an injection syringe.

16 cl, 6 dwg

Description

The field of technology to which the invention belongs

The present invention relates to dentistry, more specifically to dental syringes. In particular, the invention relates to a system for fixing the body of an injection syringe relative to its handle.

Prior Art

The injection syringe contains two main parts: a handle for handling the syringe and a housing for placing the needle and a compartment for the fluid to be injected or withdrawn.

The invention relates to a syringe which has a disposable injection needle, in particular for use in dentistry.

Classical syringes used in dentistry have a handle provided with a plunger and ribs for finger grip, and a body that is removable to be screwed onto the handle after the cartridge is in place. This body additionally has a threaded nose for screwing the base with the needle originally packaged in a protective sheath to avoid the risk of puncture when handling the needle and when screwing the base onto the syringe body. The protective sheath, which is removed when using a syringe, is then reinstalled to unscrew the base. This type of syringe has four main disadvantages. First, when the needle is re-encapsulated, it is against the end of the needle, resulting in relatively frequent punctures with all the risks that piercing with a dirty needle entails. In addition, the reusable syringe body becomes contaminated with the patient's saliva, requiring complete sterilization after use. In addition, the cartridge is not protected during oral administration despite the risk of accidental rupture due to the high pressure required to inject the liquid. Finally, screwing in and out of the syringe base and body, on the one hand, and the syringe body and handle, on the other hand, are relatively time-consuming operations for the practitioner.

Also known from patent application FR 2633520 is a disposable syringe containing a reusable handle. The system for fixing the syringe relative to the handle contains an annular recess at the longitudinal open end of the syringe designed to interact with the rib of the handle sleeve when the sleeve is located inside the longitudinal open end of the syringe. The syringe further comprises a movable protective sheath capable of protecting the needle in one position and closing the fixation system in another position.

This type of syringe is made of plastic material such as polypropylene. Polypropylene is inexpensive, easy to manufacture, compatible with medical needs, and has some elasticity that allows the material to deform in such a way as to allow the rib to fit into the annular recess.

The disadvantage of this system is that the resilience of the polypropylene can cause the handle and syringe to separate. Indeed, in particular in dentistry, the contact surface of the handle and the syringe is often subjected to stresses transverse to the longitudinal axis of the syringe. The resilience of the plastic, combined with the shear force, can cause the syringe to deform enough to cause the handle to detach from the syringe during use.

Therefore, there is a need for a reusable syringe body and handle containing a secure locking system that is quick and easy to install, greatly reduces the risk of needle sticking before and after use, and is cost effective.

Brief summary of the invention

The present invention relates to a syringe for injection, containing a body and a handle designed to interact with each other to provide the function of mutual fixation of the body and the handle. The body of the syringe for injection contains a longitudinal sleeve containing at least one female or male retaining means, and a protective sheath capable of moving along the longitudinal sleeve and capable of closing at least one retaining means of the longitudinal sleeve in the retracted position. The syringe handle comprises at least one male or female retaining means adapted to interact with at least one female or male retaining means of the longitudinal sleeve to provide a holding function, said interaction being referred to as a locking position. The syringe further comprises at least one locking device that provides a radial retention function when both the retracted position and the locked position are actuated.

According to one embodiment, each female retainer of the longitudinal sleeve and/or handle is connected to a guide for guiding the male retainer from the inlet to the female retainer, wherein the guide comprises anti-backward means to resist displacement of the male retainer from the female retainer towards the guide. In this way, the risk of the male means unintentionally leaving the female holding means is prevented. In particular, the backstop means makes it more difficult to move the male retainer from the female retainer towards the guide than it is to move it from the guide to the female retainer.

In one of the embodiments, in which the longitudinal sleeve contains at least one female retaining means, and the syringe handle contains at least one male retaining means adapted to interact with at least one female retaining means of the longitudinal sleeve, the longitudinal sleeve further comprises an inlet and a guide adapted to guide at least one male syringe handle means from the inlet to the female means.

In accordance with one embodiment, the backstop means has a guide of lesser width than the length of the male retaining means in the longitudinal direction of the longitudinal sleeve.

According to one embodiment of the invention, the width of the guide is smaller than the width of the female retaining means.

According to one embodiment, the part containing the female retaining means has a lower elastic modulus than that of the male retaining means or the part containing the male means.

In particular, when the syringe handle contains at least one male means protruding beyond its outer surface, and the longitudinal sleeve contains at least one female means for receiving the male means of the syringe handle, the longitudinal sleeve has an advantageously lower modulus of elasticity, than the male retaining means, with the result that the longitudinal sleeve is deformed during sliding, and not the male retaining means.

When the longitudinal sleeve contains at least one male means protruding beyond its inner surface, and the syringe handle contains at least one female means designed to receive the male retaining means of the longitudinal sleeve, the male retaining means of the longitudinal sleeve has a greater modulus elasticity than that of the syringe handle, resulting in the syringe handle deforming during sliding rather than the male retaining means.

According to one embodiment, the backstop means comprises a step in the direction of movement of the male retaining means from the female means towards the guide.

According to one of the embodiments of the invention, the guide contains at least two sections forming an angle at the border between them.

According to one embodiment of the invention, the guide is L-shaped.

According to one embodiment, the guide comprises at least one through slot at the boundary between the two sections of the guide and the female retainer.

According to one embodiment, the at least one blocking device provides a radial retention function to at least partially close the containment.

In accordance with one of the embodiments of the invention, the handle of the syringe contains at least one locking device.

According to one embodiment, the syringe comprises at least two locking devices, and when both the retracted position and the locked position are actuated, the at least two locking devices are evenly spaced around the containment sheath.

In accordance with one of the embodiments, at least one retaining means of the longitudinal sleeve is located near the first longitudinal end of the sleeve, and the body of the injection syringe further comprises a needle, on which the second end of the longitudinal sleeve opposite the first end is mounted, while the needle has an outer section extending beyond the longitudinal sleeve.

According to one embodiment, the containment is movable along the longitudinal sleeve between at least two positions:

an extended position in which the outer portion of the needle is inside the protective sheath; and

retracted position, in which at least part of the outer section of the needle protrudes beyond the protective sheath, and the protective sheath closes at least one holding means.

In one embodiment, the longitudinal sleeve further comprises a compartment between the first end and the second end of the sleeve designed to receive the cartridge.

According to one of the embodiments of the invention, the needle further has an internal section located inside the compartment of the longitudinal sleeve.

According to one embodiment, the inner diameter of the containment is advantageously equal to the outer diameter of the longitudinal sleeve.

According to one embodiment, at least one blocking device is curved, and the radius of curvature of the inner surface of at least one blocking device is preferably equal to the radius of curvature of the outer surface of the containment shell.

The present invention also relates to a syringe handle adapted to interact with the body of the injection syringe according to the present invention, comprising at least one female or male holding means and at least one protective sheath capable of moving along the longitudinal sleeve of the body of the injection syringe , while the handle of the syringe contains:

at least one female or male retaining means adapted to interact with at least one female or male retaining means of the body of the injection syringe to provide a retention function, said interaction being referred to as a locking position; and

at least one locking device adapted to engage with the containment sheath of the injection syringe body at a predetermined position, wherein the at least one locking device provides a radial retention function when both the predetermined containment position and the locking position are actuated .

According to one embodiment, each female retainer of the longitudinal sleeve and/or handle is connected to a guide for guiding the male retainer from the inlet to the female retainer, wherein the guide comprises anti-backward means to resist displacement of the male retainer from the female retainer towards the guide.

The present invention also relates to an injection syringe body adapted to interact with a syringe handle according to the present invention comprising at least one male or female holding means, wherein the injection syringe body comprises:

a longitudinal sleeve comprising at least one female or male holding means adapted to hold the male or female holding means of the syringe handle in the longitudinal direction;

a protective sheath capable of moving along the longitudinal sleeve and closing in the retracted position at least one female or male retaining means of the longitudinal sleeve, wherein the interaction between the injection syringe body and the syringe handle is blocked when the retracted position is actuated.

According to one embodiment, each female retainer of the longitudinal sleeve and/or handle is connected to a guide for guiding the male retainer from the inlet to the female retainer, wherein the guide comprises anti-backward means to resist displacement of the male retainer from the female retainer towards the guide.

Definitions

The following terms in the present invention have the following meanings:

"Groove" means a blind hole of elongated shape, for example, cut into a flat plate or into the surface of a cylinder.

"Inner" means a position closer to the longitudinal axis of the hub.

"Outer" means the position further from the longitudinal axis of the hub.

"Slit" means a through hole of elongated shape, for example, cut into a flat plate or into the surface of a cylinder.

"Bevel" means a transitional edge between two surfaces of an object.

"Guide" means a guide formed by, for example, a groove or slot and adapted to guide the respective element in the longitudinal direction by means of sliding.

Brief description of the drawings

In FIG. 1 shows a perspective view of a syringe handle according to one embodiment of the invention.

In FIG. 2A is a perspective view of a syringe barrel in accordance with one embodiment of the invention.

In FIG. 2B is a perspective view of the one illustrated in FIG. 2A of the syringe body with a cut along the longitudinal median plane.

In FIG. 3 is a view of the first longitudinal end of the longitudinal sleeve illustrated in FIG. 2A of the syringe body.

In FIG. 4A is a perspective view of the units illustrated in FIG. 1 and in FIG. 2A of the syringe body and handle prior to insertion of the male syringe handle means into the female syringe body means.

In FIG. 4B is a perspective view of the units illustrated in FIG. 1 and in FIG. 2A of the syringe body and syringe handle at the start of insertion of the male syringe handle means into the female syringe body means.

In FIG. 4C is a perspective view of the units illustrated in FIG. 1 and in FIG. 2A of the syringe body and the syringe handle when the male means is in an intermediate position in the first part of the guide.

In FIG. 4D is a perspective view of those illustrated in FIG. 1 and in FIG. 2A of the syringe body and syringe handle when the male means is in the second part of the guide.

In FIG. 4E is a perspective view of the housing illustrated in FIG. 1 and in FIG. 2A of the syringe body and syringe handle when the male means is in the female means.

In FIG. 5A is a perspective view of the housing illustrated in FIG. 1 and in FIG. 2A of the syringe body and syringe handle before the containment is retracted.

In FIG. 5B is a perspective view of the units illustrated in FIG. 1 and in FIG. 2A of the syringe body and syringe handle after the containment has been retracted into the retracted position.

In FIG. 5C is an enlarged perspective view of the units illustrated in FIG. 1 and in FIG. 2A of the syringe body and syringe handle after the containment has been retracted into the retracted position.

In FIG. 6 shows an exploded view of the longitudinal sleeve illustrated in FIG. 2A of the syringe and cartridge body.

Reference positions

1 - syringe body;

2 - longitudinal sleeve;

21 - the first longitudinal end of the sleeve;

22 - the second longitudinal end of the sleeve;

23 - needle;

23a - outer section of the needle;

23b - the inner section of the needle;

24 - inlet;

25 - guide;

26 - female holding means;

27 - section;

28 - intermediate position;

29 - guide bevel;

3 - protective shell;

4 - syringe handle;

41 - ribs for gripping fingers;

42 - plate;

43 - cuff;

5 - plunger;

6 - clutch;

7 - blocking devices;

8 - male holding means;

81 - protrusion of the covered means;

83 - bevel covered means;

9 - compartment;

10 - cartridge.

Detailed description of the invention

The injection syringe according to the present invention includes a handle and a body, and provides a locking function. In one embodiment, this locking function is preferably provided by a holding function and a radial holding function.

The holding function ensures that the handle 4 and the body 1 of the injection syringe are fixed when they are moved and rotated relative to each other.

In one embodiment, the holding function is provided by the interaction of the female holding means 26 of the body 1 of the injection syringe and the male means 8 of the handle 4. In the following description, various embodiments are discussed in which the female holding means 26 and the female holding means 8 are configured in different ways.

In one embodiment, the radial retention function is provided by the interaction of the containment 3 in the retracted position and at least one locking device 7. The following description discusses various embodiments in which the containment 3 and at least one locking device 7 are configured in various ways.

The radial holding function fixes the handle 4 and the body 1 of the injection syringe relative to each other and prevents radial deformation of the body of the injection syringe and the handle in the radial direction under stress during use. Radial deformation of the sleeve 2 of the syringe body can lead to the detachment of the male means 8 from the female means 26.

The radial holding function and the holding function interact with each other so as to provide a locking effect that is superior to the corresponding effect if only one of the two functions were provided.

The following detailed description will be better understood when read in conjunction with the drawings. For the purpose of illustrating the device, the preferred embodiments are given. However, it should be understood that its use is not limited to the precise arrangements, structures, features, embodiments, and features shown. The drawings are not to scale and are not intended to limit the scope of the claims to the illustrated embodiments. Accordingly, it should be understood that in cases where features appearing in the appended claims are provided with reference numerals, such numerals are indicated solely for the purpose of providing greater clarity of the claims and in no way limit the scope of the claims.

The present invention relates to a syringe comprising a handle 4 and a body 1 containing a secure locking system, quick and easy to install, greatly reducing the risk of needle sticking before and after use, and cost effective. The present invention also relates to a method of using said syringe.

The syringe for injection according to one aspect of the present invention includes a body 1 and a handle 4 designed to interact with each other to provide the function of mutual fixation of the body 1 and the handle 4. The body 1 of the injection syringe includes a longitudinal sleeve 2 containing at least one female retaining means 26 and a protective shell 3 capable of moving along the longitudinal sleeve 2 and closing in the retracted position at least one female retaining means 26. The handle 4 of the syringe contains at least one male retaining means 8 adapted to interact, with at least one female holding means 26 providing a holding function; this interaction is referred to as the fixation position.

In one embodiment, the syringe further comprises at least one locking device 7 which provides a radial retention function when both the retracted position and the locked position are actuated. In one of the embodiments, the radial retention function is provided by the fact that the protective shell 3 at least partially closes at least one blocking device 7.

The syringe according to another aspect of the present invention comprises at least one male holding means 8 (also referred to as male means) on the handle 4, designed to be inserted into at least one female holding means 26 (also referred to as female means) of the body sleeve 2 1 syringe. During use, the male means 8 and the female means 26 are closed by the protective sheath 3 in the retracted position. In addition, the syringe contains at least one locking device 7. In the retracted position, the protective sheath 3 is fixed in a radial position between the sleeve 2 of the syringe body and at least one locking device 7. At least one locking device 7 and the protective sheath 3 provides a rigid arrangement of the section of the sleeve 2 containing the female means 26 without the risk of accidental disassembly. This prevents the separation of the male means 8 and the female means 26 due to the deformation of the sleeve 2.

The following describes a method of using a syringe according to one of the embodiments of the present invention.

In the first stage, illustrated in FIG. 6, the cartridge 10 is inserted into the compartment 9 of the longitudinal sleeve 2 of the syringe body 1, more precisely into the first longitudinal open end 21 of the sleeve 2.

In the second stage, as shown in Fig. 4A, the first longitudinal end 21 of the syringe body 1 is placed in front of the sleeve 6 of the syringe handle 4, or the inlet 24 is placed in front of the male means 8.

At the third stage in the first embodiment, the male means 8 is inserted into the inlet 24 of the longitudinal sleeve 2 and moved along the longitudinal sleeve 2 until the male means 8 is in the position of fixation in the female means 26.

In the third step in the second embodiment, as shown in FIG. 4B, the sleeve 6 of the syringe handle 4 is inserted into the longitudinal sleeve 2. Then the handle 2 is moved along the longitudinal axis A of the longitudinal sleeve 2 until the male means 8 is in the intermediate position 28 as shown in FIG. 4C. Finally, as shown in FIG. 4D rotate the syringe body 1 with respect to the handle of the syringe, and the male means 8 moves smoothly into the second part of the guide 25 up to the female means 26 and enters the locking position. As shown in FIG. 4E, in the locked position 8, in order to return the male means towards the guide 25, it is necessary to deform the male means 8 and/or the sleeve 2, therefore such a return is not possible without applying a minimum force when rotating in the opposite direction.

In the fourth step, the containment 3 is moved along the longitudinal sleeve 2 to close the female means 26 or the first end of the longitudinal sleeve 21 in the retracted position, as shown in FIG. 5A and FIG. 5B. As shown in FIG. 5C, the containment 3 is inserted in the radial direction between the longitudinal sleeve 2 and the locking devices 7. According to one embodiment, the movement of the containment 3 along the longitudinal sleeve 2 from the extended position to the retracted position is limited by the plate 42 of the handle 4.

The containment sheath 3, when both the locked position and the retracted position are actuated, is locked in the radial direction between the longitudinal sleeve 2 and at least one locking device 7 to prevent the male means 8 from detaching from the retaining means 26. At least one locking device 7 and protective sheath 3 provide an improved rigid arrangement of the sleeve 6 and the sleeve section containing the female means 26 without the risk of accidental disassembly

The method optionally includes a fifth step of penetrating the subject's body and administering fluid from the cartridge by depressing plunger 5.

After use, the protective sheath 3 in the extended position can be removed from the locking devices 7, and the handle 4 can be removed from the body 1 of the syringe without the risk of accidental piercing by the needle 23. In accordance with one embodiment (not illustrated), the protective sheath 3 can be moved along the sleeve 2 from the extended position to the irreversible position so that the extended position is between the irreversible position and the retracted position. In the irreversible position, the protective sheath 3 is irreversibly in a position in which the outer portion of the needle 23 a is inside and/or protected by the sheath 3. In one embodiment, the containment 3 cannot move along the sleeve 2 from an irreversible position to an extended position.

In accordance with one embodiment, the cartridge is removed with the removal of the handle 4 by the cuff 43 creating a vacuum between the cuff 43 and the cartridge 10 after injection.

The syringe according to the invention comprises two separate elements: the body of the injection syringe shown in FIG. 2a and fig. 2B and the syringe handle shown in FIG. 1. The body 1 of the injection syringe shown in FIG. 2A comprises a longitudinal sleeve 2 and a protective sheath 3 adapted to slide along the syringe body in the longitudinal direction A of the sleeve.

The syringe handle 4 shown in FIG. 1 may include a sleeve 6 which may have a hollow cylindrical shape. The handle 4 of the syringe may additionally contain ribs 41 for gripping fingers, made in one piece with the sleeve 6, and a plunger 5 adapted to slide inside the handle 4 of the syringe, in particular, the sleeve 6.

In one embodiment, the plunger 5 includes a stem whose diameter is advantageously smaller than the inside diameter of the sleeve 6. The plunger 5 may include a control button that allows the plunger 5 to be moved within the handle 4 of the syringe and the sleeve 6. In accordance with one embodiment of the invention at the end of the plunger 5, opposite the control button, additionally contains a cuff 43, the diameter of which exceeds the diameter of the plunger rod, while the cuff 43 ends on the open surface of the sleeve 6. In the above embodiment, the plunger 5 cannot be removed from the handle 4 of the syringe.

In accordance with one embodiment of the invention, the cuff 43 has an outer diameter substantially equal to the inner diameter of the cartridge 10. In the mentioned embodiment, the ejection of the liquid contained in the cartridge 10, in combination with the advancement of the cuff 43 inside the cartridge, creates a vacuum between the cuff 43 and the cartridge 10. Cuff 43 provides the possibility of removing the cartridge from the sleeve 2 when removing the handle 4 of the syringe. During the removal of the plunger 5 from the longitudinal sleeve 2, the vacuum inside the cartridge 10 does prevent the collar 43 from sliding along the cartridge. Accordingly, the cartridge 10 is removed from the sleeve 2 together with the handle 4.

In accordance with one of the embodiments of the invention, the sleeve 6 can be inserted into the longitudinal sleeve 2 of the housing 1 of the syringe.

In one embodiment, the sleeve 6 has a cylindrical shape.

In one embodiment, the handle 4 is formed by a solid element and a plunger 5. In one embodiment, the handle 4 is formed by a single casting and a plunger 5. In one embodiment, the single casting comprises at least one locking device 7. In In one embodiment, the single molded part comprises finger grip ribs, a sleeve 6 and at least one locking device 7.

The sleeve 6 includes at least one male retaining means 8. The male means 8 may be a ledge, a ledge or a pin. According to one of the embodiments of the invention, the male means 8 extends in the radial direction from the outer surface of the coupling 6.

According to one of the embodiments of the invention, the male means 8 has a bevel on the distal side to facilitate the penetration of the handle 4 inside the longitudinal sleeve 2.

In addition, it should be understood that the male holding means 8 and the female holding means 26 may be interchanged. In one embodiment (not illustrated), the sleeve 2 may comprise at least one male means protruding beyond its inner surface, and the sleeve may comprise at least one female means designed to accommodate the male means of the sleeve 2

The syringe additionally contains at least one blocking device 7.

According to one embodiment, the syringe handle 4 further comprises at least one locking device 7. According to one embodiment, at least one locking device 7 extends from the finger grip ribs. In accordance with another embodiment of the invention, the handle 4 of the syringe includes a plate 42 with a surface perpendicular to the longitudinal direction of the plunger 5. In accordance with the above embodiment, the plate 42 contains a cavity in which the plunger 5 is located.

In one embodiment, the sleeve 6 and at least one blocking device 7 extend from the plate 42 in the longitudinal direction parallel to the longitudinal axis of the plunger 5.

According to one embodiment, at least one locking device 7 is a hollow cylinder having a common axis with the clutch 6 and an inner diameter greater than the outer diameter of the clutch 6 or the sum of the outer diameters of the clutch 6 and at least one male holding means 8. In one embodiment, at least one locking device 7 is a grip or collet.

In one of the alternative embodiments illustrated in FIG. 1, the handle 4 of the syringe contains two blocking devices 7, each of which is part of a hollow cylinder having a common axis with the sleeve 6 and an inner diameter greater than the outer diameter of the sleeve 6 or the sum of the outer diameters of the sleeve 6 and at least one male holding means. 8. In one embodiment, the syringe handle 4 comprises N locking devices 7, where N is an integer equal to or greater than 2, and each locking device 7 is part of a hollow cylinder,

having a common axis with the sleeve 6 and an inner diameter greater than the outer diameter of the sleeve 6 or the sum of the outer diameters of the sleeve 6 and at least one male retaining means 8. In the above embodiment, N locking devices are evenly spaced around the longitudinal axis of the plunger 5. By arrangement, it should be understood that the center point of each of the N blocking devices is separated from the center point of an adjacent blocking device by an angle preferably equal to 360°/N.

According to one embodiment of the invention, the syringe handle comprises N locking devices, where N is an integer equal to 2 or more, and the locking devices are evenly spaced around the handle sleeve 6 or around the syringe body sheath 3 when the handle is connected to the syringe body.

In accordance with another embodiment, at least one locking device 7 is contained in the body of the syringe or in a protective sheath.

According to one embodiment, the at least one locking device 7 is a collet or sealing ring around the containment 3. In said embodiment, the at least one locking device is made of metal or plastic.

According to one embodiment, at least one blocking device 7 is not a containment 3 or is not included in the containment 3.

In one embodiment, the at least one locking device 7 comprises an internally threaded ring designed to fit around the containment and screw onto the syringe handle 4 or the syringe body 1. According to this embodiment, the handle 4 is provided with a thread at its end adjacent to the sleeve 6, but having an inner diameter greater than the outer diameter of the sleeve 6, the thread being designed to interact with the female ring.

In accordance with another embodiment, the handle 4 of the syringe contains a thread, and the protective sheath 3 contains a thread designed to interact with the threads of the handle 4. The protective sheath 3 is screwed into the handle 4 of the syringe, ensuring the rigidity of the protective sheath 3 and preventing the sleeve 2 from deforming.

According to one embodiment of the invention, the longitudinal sleeve 2 has a hollow cylindrical shape.

As shown in FIG. 2a and fig. 2B, the longitudinal sleeve 2 has a first longitudinal end 21 and a second longitudinal end 22 opposite the first longitudinal end 21 and further comprises a compartment 9 located between the first and second longitudinal ends. As shown in FIG. 6, the first longitudinal end 21 is open and the longitudinal sleeve 2 is designed to receive the cartridge 10 in the compartment 9. According to one embodiment of the invention, the longitudinal sleeve 2 is transparent, allowing the level of liquid remaining in the cartridge 10 to be seen during use.

As shown in FIG. 2B, the longitudinal sleeve 2 is provided at its second longitudinal end 22 with a sealed base with a needle or cannula, whereby an outer section 23a protrudes beyond the sleeve 2 and an internal section 23b located inside the sleeve 2.

The inner section 23b of the needle 23 is designed to pierce the cartridge 10 when the cartridge is in the compartment 9.

In accordance with one of the embodiments of the invention, the longitudinal sleeve 2 has a cylindrical shape and has an inner diameter corresponding to the outer diameter of the sleeve 6 of the handle 4 of the syringe. The first end 21 of the longitudinal sleeve 2 has an internal diameter adapted to accommodate the sleeve 6 of the syringe handle 4.

According to one embodiment of the invention, the longitudinal sleeve 2 is made of polypropylene.

The longitudinal sleeve 2 comprises, near the first longitudinal end 21, at least one female means 26 designed to accommodate at least one male retaining means 8 of the handle 4. According to one embodiment, the female means 26 is a through hole.

As shown in FIG. 3, the longitudinal sleeve 2 may comprise an inlet 24 and a guide 25 adapted to guide the male retaining means 8 of the handle 4 from the inlet 24 into the female means 26.

According to one embodiment, the guide 25 is L-shaped, the direction of the male means 8 corresponding to the first movement in the longitudinal direction A of the sleeve 2 from the inlet 24 to the intermediate position 28 and the second movement in the direction transverse to the first direction of movement from the intermediate position 28 into the female means 26. The guide 25 may be a groove cut in the inner surface of the sleeve 2. The guide 25 may have a larger inner diameter than the inner diameter of the sleeve 2. The guide 25 may also be a through slot or a blind slot of the inner surface of the sleeve 2.

In one embodiment, illustrated in FIG. 3, the first section of the guide 25 corresponds to a groove or blind slot in the inner surface of the sleeve 2, the intermediate position is the through hole, and the second section of the guide 25 is the through slot.

In this embodiment, when the male means 8 is inserted into the inlet 24 as shown in FIG. 4A and 4B, sleeve 2 and male means 8 are irregularly shaped until male means 8 reaches the open intermediate position 28 as shown in FIG. 4C. The open intermediate position 28 may be a through hole of a shape adapted to fit the male means 8.

In one embodiment, the male means 8 has a bevel 83 on the side intended to be inserted into the inlet 24 (see Fig. 4A and Fig. 4D), to facilitate the deformation of the male means 8 or sleeve 2 and the introduction of the male means 8 into engagement with guide 25. In accordance with one embodiment of the invention, the side of the male means 8 opposite the bevel 83 has a right angle in order to create a force of resistance to the release of the male means 8, i.e. exit of the covered means 8 from the guide 25.

The second portion of the guide 25 is capable of guiding the male means 8 from the intermediate position 28 to the female retaining means 26. According to one embodiment, the second portion of the guide 25 is an elongated slit or through hole.

In accordance with one embodiment, the second portion of the guide 25 has a width less than the width of the female retaining means 26 and less than the length of the male means 8 in direction A in order to deform the male means 8 and/or the sleeve 2 during sliding from the intermediate position 28 to the female holding means 26 in the locked position. The dimensions of the female means 26 allow the sleeve 2 and/or the male means 8 to recover their original shape. Accordingly, resistance is provided to the return of the male means 8 from the female retaining means 26 towards the guide 25, which prevents the male means 8 from being accidentally removed from the female retaining means 26. According to one preferred embodiment, the sleeve 2 has a lower modulus of elasticity than the male means. 8. In other words, it is the sleeve 2 that deforms during sliding, not the male means 8.

More generally, the part containing the female means has a lower elastic modulus than that of the male means or the part containing the male means. In the case where the sleeve 2 contains; at least one male means protruding beyond its inner surface, and the coupling contains at least one female means designed to accommodate the male means of the sleeve 2, the male means of the sleeve 2 has a higher modulus of elasticity than that of the coupling 6.

According to one embodiment, the male means 8 comprises a side protrusion 81 (see FIG. 4D) to increase its length in direction A, the shape of the female means 26 being designed to match the male means 8 and its side protrusion 81. This shape of the female means 26 may, in particular, provide a cut 27 adapted to accommodate the protrusion 81 of the male means 8.

By "width of the second section of the guide" is meant the size of the second section of the guide in direction A.

In accordance with one embodiment, the second section of the guide 25 additionally has a bevel 29 (see Fig. 4D) on the opposite side of the cut 27 to facilitate the sliding of the male means 8 in the direction of the female means 26. The sleeve 2 on the second section of the guide 25 is actually deformed, when the male means 8 slides along the second section of the guide 25. Accordingly, the bevel 29 makes it possible to reduce the contact surface between the sleeve 2 and the male means 8 and thereby reduce the frictional force against sliding. In addition, due to the shape of the bevel for the male means in contact with the inside of the sleeve 2, the risk of the handle 4 detaching from the sleeve 2 is reduced. The sleeve 2 must indeed be deformed to a greater extent in order to pass through the male means 8.

According to one embodiment of the invention, the longitudinal sleeve 2 comprises M female means 26 and the handle 4 comprises M male means 8, each male means 8 being designed to be inserted into the female means 26. In one embodiment, the M male means 8 are uniformly located around the sleeve 6. By uniform arrangement it should be understood that each of the M male means 8 is circumferentially spaced from the adjacent male means 8 at an angle, preferably equal to 360°/M around the longitudinal axis of the plunger 5. In this embodiment of the invention, the M female means 26 evenly spaced around the longitudinal sleeve 2. By uniform arrangement it should be understood that each of the M female means 26 is circumferentially spaced from the adjacent female means 26 at an angle preferably equal to 360°/M around the longitudinal axis of the sleeve 2.

In accordance with one embodiment of the invention, the movement of the handle relative to the body of the syringe is not reversible. In this embodiment, the guide 25 includes an anti-backward means at the junction with the female means 26. The anti-backstop prevents the male means 8 from sliding out of the female means 26 towards the guide 25. In other words, the anti-backstop means makes the male means 8 move out of the way. of the female means 26 towards the guide 25 is more difficult than from the guide 25 to the female means 26. The countermeasure against backswing may be a rectangular ledge step in the direction of movement of the male means 8 from the female means 26 towards the guide 25.

In one embodiment, M is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more. According to one preferred embodiment, M is equal to 2, with the two male means 8 spaced circumferentially by 180° and the two female means 26 spaced circumferentially by 180°. According to this embodiment, the first female means 8 can be interchangeably inserted into any female means 26.

The protective sheath 3 is preferably made of a transparent material.

The protective sheath 3 has a cylindrical shape or a shape adapted to protect the outer portion of the needle 23 and the second end 22 of the longitudinal sleeve 2 with a sealed base containing the needle 23.

The containment sheath 3 is tubular and has an inner diameter adapted to slide from the outside along the longitudinal sleeve 2. According to one embodiment, the inner diameter of the containment sheath 3 is preferably equal to the outer diameter of the longitudinal sleeve 2 and is preferably equal to or greater than the sum of the outer diameter of the sleeve 6 and the radial height of the male tools 8 handles 4 syringes.

The protective sheath 3 is movable along the longitudinal axis 2 and along the longitudinal axis A of the longitudinal sleeve. According to one embodiment, the containment 3 can move between at least two positions:

extended position, in which the outer section of the needle 23 a is inside the protective sheath 3; and

retracted position, in which at least the end of the needle extends beyond the protective sheath 3, and the protective sheath closes at least one female retaining means 26 or the first end 21 of the longitudinal sleeve 2.

According to one embodiment, the containment 3 is movable along the longitudinal sleeve 2 and/or along the longitudinal axis A of the longitudinal sleeve from an extended position to an irreversible position, the extended position being between the retracted position and the irreversible position. In an irreversible position, the protective sheath 3 is irreversibly located where the outer portion of the needle 23a is inside and/or protected by the sheath 3.

According to one of the embodiments of the invention, near the second longitudinal end 22 of the sleeve 2 is at least one anti-backward means designed to interact with at least one anti-backward means of the containment 3, while after the containment anti-backstop 3 is between the anti-backstop sleeve 2 and the second longitudinal end 22, it is unable to move between the anti-backstop sleeve 2 and the first longitudinal end 21 of the sleeve 2.

The advantage of this irreversible position is that the user does not have to place the protective sheath on the tip of the needle 23 after use, and only needs to place the protective sheath 3 in the irreversible position in order to protect the tip of the needle 23.

According to one embodiment, the irreversible position and the retracted position are extreme positions.

The containment sheath 3 has an outer diameter designed to come into contact with at least one locking device 7 when the containment is in the retracted position and the syringe handle 4 is mounted on the syringe body 1.

According to one embodiment, the syringe according to the present invention may comprise 2, 3 or at least 4 male means 8 and the same number of female means 26 and optionally the same number of inlets 24 and guides 25 as described above.

The present invention also relates to a syringe handle 4 adapted to interact with the body 1 of an injection syringe according to the present invention and comprising:

at least one male holding means 8 adapted to interact with at least one female holding means 26 of the injection syringe body 1 to provide a holding function, said interaction being referred to as a locking position; and

at least one locking device 7 adapted to engage with the containment sheath 3 of the injection syringe body 1 in a predetermined position, wherein the at least one locking device provides a radial holding function when actuated as a predetermined position of the containment sheath 3, as well as the fixation position.

The present invention further relates to an injection syringe body 1 adapted to cooperate with a syringe handle 4 according to the present invention and comprising:

a longitudinal sleeve 2 comprising at least one female retaining means 26 adapted to retain the male retaining means 8 in the longitudinal direction;

a containment sheath 3 movable along the longitudinal sleeve 2 and capable of closing in the retracted position at least one female retaining means 26, wherein the interaction between the body 1 of the injection syringe and the handle 4 of the syringe is blocked when the retracted position is actuated.

In addition, the present invention relates to a kit containing the body 1 of the injection syringe according to the present invention, the cartridge 10 and a sterilized packaging bag for the body 1 of the injection syringe and the cartridge 10.

Although various embodiments have been described and illustrated above, the detailed description should not be construed as limiting them. Various modifications can be made to the embodiments by those skilled in the art without departing from the spirit and scope of the disclosure as limited by the claims.

Claims (30)

1. A syringe containing a body (1) and a handle (4) designed to interact with each other in order to provide the function of mutual fixation of the body (1) and the handle (4); while the body (1) of the injection syringe contains: a longitudinal sleeve (2) containing at least one female or male holding means (26), and a protective sheath (3) capable of moving along the longitudinal sleeve (2) and closing in the retracted position at least one retaining means (26) of the longitudinal sleeve (2); the handle (4) of the syringe contains: at least one female or male holding means (8) adapted to interact with at least one female or male holding means (26) of the longitudinal sleeve (2) to provide a holding function, said interaction being referred to as the locking position, the syringe further comprises at least one locking device (7) which provides a radial retention function when both the retracted position and the locking position are actuated, each female retaining means (26) of the longitudinal sleeve (2) and/or handle (4) is connected to a guide (25) for guiding the male retaining means (8) from the inlet (24) to the female retaining means (26), while the guide (25) contains an anti-backstop that creates resistance to displacement of the male retaining means (8) from the female retaining means (26) towards the guide (25). 2. The syringe according to claim 1, in which the anti-backflow means has a guide (25) of a smaller width than the width of the male retaining means (26) and the length of the male retaining means (8) in the longitudinal direction (A) of the longitudinal sleeve (2). 3. The syringe according to claim 1 or 2, in which the backstop means comprises a step in the direction of movement of the male retaining means (8) from the female means (26) towards the guide (25). 4. The syringe according to any one of paragraphs. 1-3, in which the guide (25) contains at least two sections forming an angle at the border between them. 5. The syringe according to any one of paragraphs. 1-4, in which the guide (25) is L-shaped. 6. Syringe according to claim 4 or 5, in which the guide (25) contains at least one through slot at the border between the two sections of the guide (25) and the female holding means (26). 7. The syringe according to any one of paragraphs. 1-6, wherein the portion containing the female retainer has a lower elastic modulus than that of the male retainer. 8. The syringe according to any one of paragraphs. 1-7, containing at least two locking devices (7), wherein, when both the retracted position and the locking position are actuated, at least two locking devices (7) are evenly spaced around the containment shell (3 ), providing the function of radial retention and at least partially closing the protective shell (3). 9. The syringe according to any one of paragraphs. 1-8, in which the handle (4) contains at least one blocking device (7). 10. The syringe according to any one of paragraphs. 1-9, in which at least one retaining means (26) of the longitudinal sleeve (2) is located near the first longitudinal end (21) of the sleeve (2), and the body (1) of the injection syringe additionally contains a needle (23), on which the second end (22) of the sleeve (2) is mounted, opposite the first end (21), while the needle (23) has an outer section (23a) extending beyond the sleeve (2). 11. The syringe according to claim 10, in which the protective sheath (3) is able to move along the sleeve (1), at least between two positions: an extended position in which the outer portion of the needle (23a) is inside the protective sheath; and retracted position, in which at least part of the outer section of the needle (23a) protrudes beyond the protective sheath (3), and the protective sheath (3) closes at least one holding means (26). 12. The syringe according to claim 10 or 11, in which the longitudinal sleeve (2) further comprises a compartment (9) between the first end (21) and the second end (22) designed to accommodate the cartridge (10). 13. The syringe according to any one of paragraphs. 1-12, in which the inner diameter of the protective shell (3) is equal to the outer diameter of the longitudinal sleeve (2). 14. The syringe according to any one of paragraphs. 1-13, in which at least one blocking device (7) is bent, while the radius of curvature of the inner surface of at least one blocking device is equal to the radius of curvature of the outer surface of the containment shell (3). 15. The handle (4) of the syringe, adapted to interact with the body (1) of the injection syringe, containing at least one covering or covered holding means (26) and at least one protective sheath (3) capable of moving along longitudinal sleeve (2) of the body (1) of the syringe for injection, while the handle (4) of the syringe contains: at least one female or male holding means (8) adapted to interact with at least one female or male holding means (26) of the body (1) of the injection syringe to provide a holding function, said interaction being referred to as the locking position ; and at least one locking device (7) adapted to interact with the protective sheath (3) of the body (1) of the injection syringe in a predetermined position to provide a radial retention function when the predetermined position of the protective sheath (3) and the fixation position are activated, each female retaining means (26) of the longitudinal sleeve (2) and/or handle (4) is connected to a guide (25) for guiding the male retaining means (8) from the inlet (24) to the female retaining means (26), while the guide (25) contains an anti-backstop that creates resistance to displacement of the male retaining means (8) from the female retaining means (26) towards the guide (25). 16. The body (1) of the syringe for injection adapted to interact with the handle (4) of the syringe containing at least one covered or covering holding means (8), while the body of the syringe for injection contains: a longitudinal sleeve (2) comprising at least one female or male holding means (26) adapted to hold the male or female holding means (8) of the syringe handle (4) in the longitudinal direction; a protective sheath (3) capable of moving along said longitudinal sleeve (2) and capable of closing, in the retracted position, at least one female or male retaining means (26) of the longitudinal sleeve (2), while the interaction between the body (1) of the syringe for injection and the handle (4) of the syringe is blocked when the retracted position is activated, each female retaining means (26) of the longitudinal sleeve (2) and/or handle (4) is connected to a guide (25) for guiding the male retaining means (8) from the inlet (24) to the female retaining means (26), while the guide (25) contains an anti-backstop that creates resistance to displacement of the male retaining means (8) from the female retaining means (26) towards the guide (25).

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