Syringe tip with suction line and dispensing line

Abstract

The invention relates to a tip (1) with a longitudinal axis (X) intended to be connected to the distal end of a hollow syringe body (20), the tip (1) comprising: a tip body (30) extending from a first end (301) capable of being connected to the end of the syringe body (20) and a second end (302); a primary fluid distribution conduit (31); and a primary fluid suction conduit (32); the primary fluid distribution conduit (31) having a mean cross-section smaller than the mean cross-section of the primary fluid suction conduit (32). Figure: 1

Description

Title of the invention: Syringe tip with suction conduit and dispensing conduit

[0001] The present invention relates to a fluid suction and dispensing tip intended to be connected to the distal end of a hollow syringe body. It also relates to a syringe equipped with a tip.

[0002] More generally, a cosmetic product is a product as defined in Regulation EC No. 1223 / 2009 of the European Parliament and of the Council dated November 30, 2009, relating to cosmetic products. Technological background

[0003] In the following, the distal end of a component or device should be understood to mean the end furthest from the user's hand and the proximal end should be understood to mean the end closest to the user's hand.

[0004] A conventional syringe generally comprises a hollow cylinder forming a reservoir for a fluid to be ejected from or withdrawn into said syringe, a seal disposed inside the cylinder to delimit said reservoir at one of its ends, in particular at its proximal end, and a rod for actuating the seal forming a piston with a proximal gripping portion. In addition, the distal end of the cylinder forming a reservoir generally comprises a tip in which an axial passage is provided through which the fluid is ejected from the reservoir towards a hollow needle or drawn towards the hollow needle towards the reservoir.

[0005] Different types of syringe tips are known. For example, syringes with a conical tip, syringes with a catheter tip or syringes with needle tips are known.

[0006] Conventional syringes only offer one passage hole for aspiration and dispensing.

[0007] It is therefore necessary to choose between sucking quickly (large diameter of the passage hole) or distributing precisely (small diameter of the passage hole).

[0008] In no case can a perfect compromise be found.

[0009] If we choose a large diameter for the passage hole: the distribution will be very quickly and it will therefore be impossible to be precise. In addition, we cannot manage very fluid fluids (with viscosity close to that of water),

[0010] If we choose a small diameter for the passage hole: we will not be able to suck up cream-type fluids.

[0011] There is a need:

[0012] To obtain a different suction flow rate and a different distribution flow rate,

[0013] Have a syringe model to facilitate format change,

[0014] To obtain rapid aspiration of cosmetic products and precise distribution.

[0015] Definition of the invention

[0016] The invention relates to a tip with a longitudinal axis X intended to be connected to the distal end of a hollow syringe body, the tip comprising:

[0017] a tip body extending from a first end connectable to the end of the syringe body and a second end;

[0018] a primary fluid distribution conduit extending along a longitudinal axis Y between the second end of the nozzle body and a free fluid distribution end; and

[0019] a primary fluid suction conduit extending along a longitudinal axis Z between the second end of the nozzle body and a free fluid suction end;

[0020] the primary fluid distribution conduit having an average section smaller than the average section of the primary fluid suction conduit.

[0021] According to the invention, a “double” tip is proposed with a large diameter for suction and a small diameter for distribution.

[0022] The invention also relates to a syringe comprising a hollow syringe body forming a reservoir for a fluid to be ejected from or withdrawn from the syringe, a tip as described above is assembled to the distal end of the body forming a reservoir.

[0023] Preferred Embodiments

[0024] Preferably, the tip according to the invention has one or more of the following characteristics, taken alone or in combination:

[0025] The primary fluid distribution conduit also constitutes a secondary fluid suction conduit.

[0026] The primary fluid distribution conduit has an internal volume less than the internal volume of the primary fluid suction conduit.

[0027] The longitudinal axis Y of the primary distribution duct and the longitudinal axis Z of the primary suction duct are axially offset relative to the longitudinal axis X.

[0028] At least one of the longitudinal axis Y of the primary distribution duct and the longitudinal axis Z of the primary suction duct is inclined relative to the longitudinal axis X of the nozzle.

[0029] The tip is provided with a valve.

[0030] The valve comprises a flexible part which deforms according to the direction of the fluid flow.

[0031] The valve is an umbrella valve.

[0032] The primary fluid suction conduit is provided with a valve for suction and distribution of the fluid.

[0033] The tip is formed in a single piece of plastic material. Description of figures

[0034] Other characteristics and advantages of the invention will emerge from reading the detailed description which follows, from non-limiting examples of implementation thereof, and from examining the appended drawing, in which:

[0035] [Fig.l],

[0036] [Fig.l] represents a photograph of a syringe according to the invention,

[0037] [Fig.2],

[0038] [Fig.2] represents a longitudinal section of a tip according to the invention in suction configuration,

[0039] [Fig.3],

[0040] [Fig.3] represents a longitudinal section of the tip of [Fig.2] in the dispensing position,

[0041] [Fig.4],

[0042] [Fig. 4] represents an umbrella valve marketed by the Minivalves Company in the closed position,

[0043] [Fig.5],

[0044] [Fig.5] represents an umbrella valve marketed by the Minivalves Company in the open position.

[0045] [Fig. 1] represents a syringe 20 according to the invention (partially represented in the figure) defining a reservoir (partially represented) for containing a fluid, for example a cosmetic fluid, comprising a tip 1 having a longitudinal axis X.

[0046] The tip 1 includes a suction conduit 32 along the longitudinal axis Y providing a passage for transferring the fluid to be sampled to the syringe 20 from the distal end 321 and a distribution conduit 31 along the longitudinal axis Z providing a passage for transferring the fluid to be ejected from the reservoir to the distal end 311.

[0047] The tip 1, in the example shown, comprises two portions, a first portion formed by the cylindrical tip body 30 and a second portion formed by the primary conduits 31, 32 with longitudinal axes substantially parallel to each other. Said first portion 30 extends between the proximal end 301 of the body of the tip 1 and its distal end 302. Said second portion 31, 32 extends between the distal end 302 of the body of the tip 1 and the respective distal ends 311 and 321 of the distribution channel 31 and the primary suction conduit 32.

[0048] According to the invention, the primary fluid distribution conduit 31 has a mean cross-section smaller than the mean cross-section of the primary fluid suction conduit 32. Advantageously, the primary fluid suction conduit 32 has a mean diameter DI larger than the mean diameter D2 of the primary fluid distribution conduit 31.

[0049] [Fig.2] represents a tip according to the invention in suction configuration and the arrows materialize the path of the fluid during suction. In this figure, it can be seen that the primary fluid suction conduit 32 and the primary fluid distribution conduit 31 are both used for faster suction of the fluid. In addition, in the example shown, the conduits 31, 32 are connected by a transition zone 16 having a non-zero width measured perpendicular to the longitudinal axis X of the nozzle 1. A valve 20, the operation of which is described in detail below, allows the fluid sucked through the primary suction conduit 32 to pass to the nozzle body 30. In the figure, the secondary suction conduit 31 is not closed by a valve at its junction with the body 30 but it could be. In fact, fluid passes directly from the secondary suction conduit 31 to the nozzle body 30, without regulation by a valve.

[0050] [Fig.3] represents a tip according to the invention in the dispensing configuration and the arrows materialize the path of the fluid during distribution. In this figure, we observe that only the primary fluid distribution conduit 31 is used for distributing the fluid.

[0051] In the example shown, the transition zone 16 has a truncated cone shape, which has the advantage of reinforcing the end piece 10 at the junction between the conduits 31, 32 and the body 30.

[0052] The tip 10 can be assembled to the syringe body by screwing, snapping, clipping or force-fitting. The tip 10 of the syringe according to the invention can comprise, for example, a groove or a thread for its assembly with the syringe body.

[0053] In one embodiment of the invention, the end piece 10 can be made of polycarbonate.

[0054] The elastomer umbrella valve shown in Figures 4 and 5 is provided with a sealing element 21 extended by a rod 23, in the form of an umbrella, mounted on a seat 22. The umbrella is deformable between an open position and a closed position. In the closed position ([Fig.4]), the sealing element 21 tends to flatten against the seat 22 of the valve under the effect of the flow, presenting a concavity facing downstream of the flow of the dispensed fluid and possibly absorbing irregularities of the seat 22 to form a seal therewith. In this closed position, the sealing element closes the annular flow channel 24 of the seat 22. In the open position, the umbrella valve 20 allows a flow of a fluid downstream of the flow of the sucked fluid once the upstream pressure creates sufficient force to lift the sealing element 21 from the seat 22 and to turn it over ([Fig.5]), in order to present a concavity facing downstream of the flow.

[0055] The main advantage over other types of valves such as spring disc valves is that an umbrella valve uses its elastic properties and the deformable convex shape to create a seal against the seat 22, the central stem 23 holding the sealing disc in place, avoiding additional components such as a spring or central or circumferential disc positioners. The design of the valve assembly is simplified and makes it adaptable to a minimal space, reducing the number of parts, simplifying assembly, which proves economically profitable.

[0056] Of course, the invention is not limited to the example of implementation which has just been described.

[0057] The shape of the conduits may in particular be different from that shown.

Claims

Claims

1. Tip (1) of longitudinal axis (X) intended to be connected to the distal end of a hollow syringe body (20), the tip (1) comprising: a tip body (30) extending from a first end (301) capable of being connected to the end of the syringe body (20) and a second end (302); a primary fluid distribution conduit (31) extending along a longitudinal axis (Y) between the second end (302) of the tip body (30) and a free fluid distribution end (311); and a primary fluid suction conduit (32) extending along a longitudinal axis (Z) between the second end (302) of the tip body (30) and a free fluid suction end (321); the primary fluid distribution conduit (31) having an average section smaller than the average section of the primary fluid suction conduit (32).

2. End piece according to claim 1, characterized in that the primary fluid distribution conduit (31) also constitutes a secondary fluid suction conduit.

3. End piece according to any one of the preceding claims, characterized in that the primary fluid distribution conduit (31) has an internal volume less than the internal volume of the primary fluid suction conduit (32).

4. End piece according to any one of the preceding claims, characterized in that the longitudinal axis (Y) of the primary distribution duct (31) and the longitudinal axis (Z) of the primary suction duct (32) are axially offset relative to the longitudinal axis (X).

5. End piece according to any one of the preceding claims, characterized in that at least one of the longitudinal axis (Y) of the primary distribution duct (31) and the longitudinal axis (Z) of the primary suction duct (32) is inclined relative to the longitudinal axis (X) of the end piece.

6. Tip according to any one of the preceding claims, characterized in that it is provided with a valve (20).

7. Tip according to the preceding claim, characterized in that the valve (20) comprises a flexible part (21) which deforms in the direction of the fluid flow.

8. Tip according to the preceding claim, characterized in that the valve (20) is an umbrella valve.

9. End piece according to any one of the preceding claims, characterized in that the primary fluid suction conduit (32) is provided with a valve (20) as defined according to any one of claims 7 or 8 for the suction and distribution of the fluid.

10. End piece according to any one of the preceding claims, characterized in that it is formed in a single piece of plastic material.

11. Syringe (20) comprising a hollow syringe body (20) forming a reservoir for a fluid to be ejected from or withdrawn from the syringe, characterized in that a tip (1) according to any one of the preceding claims is assembled to the distal end (201) of the body (20) forming a reservoir.

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