INJECTION SYRINGE
A syringe is provided with a body, a piston capable of sliding in the body, and an injection device comprising a needle oriented along a longitudinal axis and a casing removably secured to the body and carrying said needle, the casing comprising a plurality of flexible tabs each provided with a stop, the piston comprising a docking system provided with a housing that comprises a flange configured to hold the stops of the flexible tabs in the housing in an insertion position in which the tabs are inserted into the housing, the plurality of tabs comprising a first tab and a second tab situated in opposing areas around the longitudinal axis, the flange comprising a first bearing area and a second bearing area configured to be in contact respectively with the first tab and the second tab in the insertion position.
This application is a continuation application of U.S. patent application Ser. No. 16/388,294, filed Dec. 28, 2018, which is a national phase entry of international patent application Ser. No. PCT/EP2017/061781, filed May 17, 2017, which claims benefit and priority to French application Ser. No. FR 1656053, the contents of which are hereby incorporated herein by reference in their entireties.
FIELD OF THE INVENTIONThe present invention relates to an injection device and a syringe provided with such a device.
A preferred application is in the medical devices and accessories industry.
TECHNOLOGICAL BACKGROUNDIn the medical field, injection devices using a needle are known, this term referring here to any pointed device allowing a fluid to pass therethrough towards the human or animal body in particular. In particular, such a device as a syringe comprising a body and a piston that can slide in the body is known from document WO 2004/014470 A1. In addition, to carry out the injection, the syringe includes an injection device attached to the head of the syringe body and provided with a needle. Such a device is illustrated in
The sealing techniques thus used seriously increase the complexity of the assembly of the devices and their costs.
A needle deflection system is known from US document A1 4804370 in which the root of the needle, visible in
US document A1 2008/027381 shows a single cooperation area (see
Document WO A1 91/07198 shows a single, continuous tab in a plane transverse to the length of the syringe and provided with a stop capable of cooperating with a piston housing.
Document WO A2 2007/123826 also shows a cooperation between a single casing surface and a single surface of a piston housing.
The present invention makes it possible to remedy all or at least some of the drawbacks of the current techniques.
SUMMARY OF THE INVENTIONOne aspect of the invention relates to a syringe provided with a body, a piston capable of sliding in the body, and an injection device comprising a needle oriented along a longitudinal axis and a casing removably secured to the body and carrying said needle, the casing comprising a plurality of flexible tabs each provided with a stop, the piston comprising a docking system provided with a housing that comprises a flange configured to hold the stops of the flexible tabs in the housing in an insertion position in which the tabs are inserted into the housing, the plurality of tabs comprising a first tab and a second tab situated in opposing areas around the longitudinal axis, the flange comprising a first bearing area and a second bearing area configured to be in contact respectively with the first tab and the second tab in the insertion position.
Advantageously, the first tab and the second tab are configured to exert an elastic pressure respectively on the first bearing area and the second bearing area in the insertion position, and the first bearing area and the second bearing area are dissymmetrical relative to the longitudinal axis.
Thus, the contact on the two bearing areas cannot be symmetrical around the longitudinal axis, the bearing forces are therefore not balanced, and this causes the casing and therefore the needle to tilt, so that the latter is permanently enclosed in the syringe body. The tilting is carried out efficiently without significant effort from the user because there is little resistance to the insertion sufficient to cause tilting. Advantageously but not restrictively, the tabs have a free distal end, and not joined together as is necessary in the case of a cavity bottom used for tilting the casing, so their flexibility can be chosen high.
It should be noted that there are several flexible tabs, which enables distinct elastic bearings to be provided on several places in the housing.
Other characteristics, aims and advantages of the present invention will appear upon reading the following detailed description and referring to the appended drawings given as non-limiting examples and wherein:
Prior to going into details relating to the preferred embodiments of the invention while referring more particularly to the drawings, other optional characteristics of the invention which may be implemented in any combination or alternately, are mentioned hereafter:
the first bearing area is further from the longitudinal axis than the second bearing area;
the first bearing area is on an annular flange and the second bearing area is a portion protruding beyond this flange towards the longitudinal axis;
the second bearing area is an angular sector of a ring;
the angular sector forms an angle greater than 30°;
the angular sector forms an angle of less than 90°;
the distance between two adjacent tabs is less than the width dimension of the second bearing area;
the plurality of tabs includes at least one pair of additional flexible tabs, with the tabs of the pair of tabs being situated in opposite areas about the longitudinal axis;
the first tab, the second tab and the additional tabs are uniformly distributed around the longitudinal axis;
the plurality of tabs includes only one pair of additional tabs;
the tabs of the plurality of tabs are symmetrical two by two relative to the longitudinal axis;
the distal ends of the tabs are disjointed.
For the proper understanding of the invention, the following definitions shall apply:
longitudinal axis 15: the long dimension of the needle, and may also be the long dimension of the syringe and/or the injection device and/or the piston when the needle is in position mounted on the syringe head and not retracted into the syringe body; generally speaking, the syringe body and/or the injection device and/or possibly any other part of the invention may have symmetry around the longitudinal direction of the assembly;
transverse, lateral or width mean a dimension oriented in a plane perpendicular to the longitudinal direction 15;
needle refers to any pointed device used to perform an injection function, in particular injection of fluid into a human or animal body.
The device of the state of the art shown in
According to the state of the art, a needle mounting possibility includes an interface 3 which is mounted at the head of the body 1 and which cooperates with a casing 8 provided with an inner channel receiving the needle 19. At its end opposite the reception area of the needle 19, the casing 8 comprises means of cooperation with the distal end of the piston 6. As a matter of fact, the needle is retracted by docking the lower end of its support (the casing) to the upper part of the piston so that a movement imparted to the piston causes the casing 8 and the needle 19 to move downward to a retracted position in the syringe body.
As a counterpoint to what is shown in
It should be noted, in the case shown in
The components of the casing 8 and the interface 3 are preferably each solid and come from a single piece of material, this material being preferably a plastic material.
Each tab has, from its distal end, an insertion end 20 advantageously flared from said end so as to produce a preferably conical nose which facilitates the insertion thereof into the housing 7. Above the end 20, a stop 12 is present as before and can be obtained by narrowing the section. This section can be increased again a little higher so as to define the notched portion of the tabs and to create a stop area 18, which
The interest of the areas 22 and 23 can be understood with reference to
This produces an angular shift between the longitudinal axis of the needle 19 and the longitudinal direction of the rest of the device, in particular of the body 1 and the piston 6. In this way, when the needle 19 is retracted, it shifts laterally to a position equivalent to the one shown in
- 1. Syringe body
- 2. Cap
- 3. Interface
- 4. Head
- 5. Shoulder
- 6. Piston
- 7. Housing
- 8. Casing
- 9. Point
- 10. Flange
- 11. Slugged bottom
- 12. Stop
- 13. Channel
- 14. Base
- 15. Longitudinal axis
- 16. First tab
- 17. Second tab
- 18. Stopping area
- 19. Needle
- 20. Introduction part
- 21. Seal
- 22. First bearing area
- 23. Second bearing area
- 24. Additional tab
Claims
1. A syringe provided with a body, a piston capable of sliding in the body, and an injection device comprising a needle oriented along a longitudinal axis and a casing removably secured to the body and carrying said needle, the casing comprising:
- a plurality of flexible tabs each provided with a stop, the piston comprising a docking system provided with a housing that comprises a flange configured to hold the stops of the flexible tabs in the housing in an insertion position in which the tabs are inserted into the housing, the plurality of tabs comprising a first tab, and
- a second tab situated in opposing areas around the longitudinal axis, the flange comprising a first bearing area and a second bearing area configured to be in contact with the first tab and the second tab respectively in the insertion position, characterized in that the first tab and the second tab are configured to provide elastic support respectively on the first bearing area and the second bearing area in the insertion position, and in that the first bearing area and the second bearing area are dissymmetrical relative to the longitudinal axis.
2. A syringe according to the previous claim, wherein the first bearing area is further from the longitudinal axis than the second bearing area.
3. A syringe according to the previous claim, wherein the first bearing area is on an annular flange and the second bearing area is a portion protruding beyond this flange towards the longitudinal axis.
4. A syringe according to one of the previous claims, wherein the second bearing area is an angular sector of a ring.
5. A syringe according to the previous claim, wherein the angular sector forms an angle greater than 30°.
6. A syringe according to one of the previous two claims, wherein the angular sector forms an angle of less than 90°.
7. A syringe according to one of the previous claims, wherein the spacing between two adjacent tabs is smaller than the width dimension of the second bearing area.
8. A syringe according to one of the previous claims, wherein the plurality of tabs includes at least one pair of additional flexible tabs, with the tabs of the pair of tabs being situated in opposite areas about the longitudinal axis.
9. A syringe according to the preceding claim, wherein the first tab, the second tab and the additional tabs are uniformly distributed about the longitudinal axis.
10. A syringe according to one of the previous two claims, wherein the plurality of tabs includes only one pair of additional tabs.
11. A syringe according to one of the previous claims, wherein the tabs of the plurality of tabs are symmetrical two by two relative to the longitudinal axis.
12. A syringe according to one of the previous claims, wherein the distal ends of the tabs are disjointed.
13. A syringe according to one of the previous claims, wherein the two bearing areas are situated at the same height level along the longitudinal axis.
Type: Application
Filed: May 9, 2022
Publication Date: Aug 18, 2022
Inventor: Emmanuel Mastorakis (Monte Carlo)
Application Number: 17/662,567