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Extraction system for preparing a beverage from a cartridge using a fluid injected under pressure into the cartridge. The system includes a cartridge and an extraction device intended to accept the cartridge. The extraction device includes an injection cage and a cartridge support being arranged in

Extraction system for preparing a beverage from a cartridge using a fluid injected under pressure into the cartridge. The system includes a cartridge and an extraction device intended to accept the cartridge. The extraction device includes an injection cage and a cartridge support being arranged in such a way as to be moved relative to one another in the pre-injection mode of closure around the cartridge by a closure device. The injection cage has a base and a closure piston unit which is mounted such that it can be moved axially with respect to the base. The closure piston unit can be moved relative to the base by the pressure exerted by the fluid upon injection.

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1. An extraction system for preparing a beverage from a cartridge using a fluid injected under pressure into the cartridge, comprising: a cartridge comprising a beverage delivery wall which can be perforated under the effect of the pressure of the fluid within the cartridge, a wall for injecting the

1. An extraction system for preparing a beverage from a cartridge using a fluid injected under pressure into the cartridge, comprising: a cartridge comprising a beverage delivery wall which can be perforated under the effect of the pressure of the fluid within the cartridge, a wall for injecting the fluid into the cartridge, and a nip region; andan extraction device configured to accept the cartridge and comprising an injection cage and a cartridge support, with the injection cage including fluid injection means, a base and a closure piston unit which is mounted so that it can move axially with respect to the base; and the cartridge support comprising perforating means for perforating the delivery wall of the cartridge under the effect of the pressure of the fluid in the cartridge, wherein the injection cage comprises an internal extraction cavity having a shape designed to at least partially accept the cartridge therein;wherein the injection cage and the cartridge support are arranged in such a way as to be movable relative to one another by a closure device which closes them around the cartridge prior to injection to trap the cartridge in the nip region, and the closure piston unit is movable relative to the base under the effect of pressure exerted by the fluid against the nip region of the cartridge in order to generate clamping forces that remain higher than separating forces exerted at the nip region and thereby prevent the injection cage and the cartridge support from opening up relative to one another as the system is pressurized; andwherein the cartridge is a separate component from the extraction device and is placed on the cartridge support for being enclosed by the closure device through the relative movement, with the cartridge including sealing means, made of deformable material, to which the clamping forces of the piston unit are applied. 2. The extraction system according to claim 1, wherein the cartridge sealing means is an elastomeric seal having a thickness of 0.8 mm or less. 3. The extraction system according to claim 2, wherein the cartridge sealing means is an elastomeric seal having a thickness ranging between about 0.2 and 0.6 mm. 4. The extraction system according to claim 1, wherein the piston unit comprises a nip surface having a width of 1 mm or less. 5. The extraction system according to claim 1, wherein the cavity comprises at least one fluid supply duct and at least one opening element. 6. The extraction system according to claim 1, wherein the injection cage includes a pressure chamber. 7. The extraction system according to claim 6, wherein the pressure chamber is at least partially occupied by elastic thrusting means. 8. The extraction system according to claim 1, wherein the piston unit comprises a nip surface that forms discontinuous pressure surface portions for pressing against the nip region of the cartridge. 9. An extraction system for preparing a beverage from a cartridge using a fluid injected under pressure into the cartridge, comprising: a cartridge comprising a beverage delivery wall which can be perforated under the effect of the pressure of the fluid within the cartridge, a wall for injecting the fluid into the cartridge, and a nip region; andan extraction device configured to accept the cartridge and comprising an injection cage and a cartridge support, with the injection cage including fluid injection means, a base and a closure piston unit which is mounted so that it can move axially with respect to the base, wherein the injection cage comprises an internal extraction cavity having a shape designed to at least partially accept the cartridge therein; and the cartridge support comprising perforating means for perforating the delivery wall of the cartridge under the effect of the pressure of the fluid in the cartridge;wherein the injection cage and the cartridge support are arranged in such a way as to be movable relative to one another by a closure device which closes them around the cartridge prior to injection to trap the cartridge in the nip region, and the closure piston unit is movable relative to the base under the effect of pressure exerted by the fluid against the nip region of the cartridge in order to generate clamping forces that remain higher than separating forces exerted at the nip region and thereby prevent the injection cage and the cartridge support from opening up relative to one another as the system is pressurized; and wherein the nip surface of the piston unit forms discontinuous pressure surface portions for pressing against the nip region of the cartridge. 10. The extraction system according to claim 9, wherein the piston unit comprises a nip surface comprising open grooves extending radially and separating the discontinuous nip portions. 11. An extraction system for preparing a beverage from a cartridge using a fluid injected under pressure into the cartridge, comprising: a cartridge comprising a beverage delivery wall which can be perforated under the effect of the pressure of the fluid within the cartridge, a wall for injecting the fluid into the cartridge, and a nip region;an extraction device configured to accept the cartridge and comprising an injection cage and a cartridge support, with the injection cage including fluid injection means, a pressure chamber that includes a base, and a closure piston unit which is mounted so that it can move axially with respect to the base; and the cartridge support comprising perforating means for perforating the delivery wall of the cartridge under the effect of the pressure of the fluid in the cartridge, wherein the pressure chamber forms an extension of the extraction cavity and the fluid is supplied to the pressure chamber by a plurality of openings or channels positioned radially between the extraction cavity and the pressure chamber; andan elastic thrusting means, wherein the pressure chamber at rest is entirely occupied by the elastic thrusting means;wherein the injection cage and the cartridge support are arranged in such a way as to be movable relative to one another by a closure device which closes them around the cartridge prior to injection to trap the cartridge in the nip region, and the closure piston unit is movable relative to the base under the effect of pressure exerted by the fluid against the nip region of the cartridge in order to generate clamping forces that prevent the injection cage and the cartridge support from opening up relative to one another as the system is pressurized. 12. The extraction system according to claim 11, wherein the pressure chamber forms an annular extension of the extraction cavity. 13. The extraction system according to claim 11, wherein the pressure chamber communicates with the extraction cavity via at least one opening or channel. 14. The extraction system according to claim 11, wherein the pressure chamber extends upstream of the extraction cavity. 15. An extraction system for preparing a beverage from a cartridge using a fluid injected under pressure into the cartridge, comprising: a cartridge comprising a beverage delivery wall which can be perforated under the effect of the pressure of the fluid within the cartridge, a wall for injecting the fluid into the cartridge, and a nip region;an extraction device configured with an extraction cavity to accept the cartridge and comprising an injection cage and a cartridge support, with the injection cage including fluid injection means, a pressure chamber that includes a base, and a closure piston unit which is mounted so that it can move axially with respect to the base; and the cartridge support comprising perforating means for perforating the delivery wall of the cartridge under the effect of the pressure of the fluid in the cartridge; andan elastic thrusting means comprising a block of elastomer or silicone delimiting a duct, wherein the pressure chamber at rest is entirely occupied by the elastic thrusting means;wherein the injection cage comprises an internal extraction cavity having a shape designed to at least partially accept the cartridge therein, and wherein the injection cage and the cartridge support are arranged in such a way as to be movable relative to one another by a closure device which closes them around the cartridge prior to injection to trap the cartridge in the nip region, and the closure piston unit is movable relative to the base under the effect of pressure exerted by the fluid against the nip region of the cartridge in order to generate clamping forces that prevent the injection cage and the cartridge support from opening up relative to one another as the system is pressurized. 16. The extraction system according to claim 15, wherein the elastic thrusting means is in the pressure chamber, is incompressible and comprises a first surface on which the fluid pressure is exerted, which extends radially with respect to the duct, and a second, thrust, surface extending transversely in such a way as to exert axial thrust on the piston unit. 17. An extraction device intended to accept a separate cartridge and comprising: an injection cage comprising fluid injection means and a cartridge support arranged in such a way as to be movable relative to one another in the mode of closure around the separate cartridge prior to injection by a closure device and to trap the cartridge in a nip region,wherein the injection cage comprises a pressure chamber, a base and a closure piston unit mounted such that it can move axially with respect to the base, with the closure piston unit comprising a lateral rim which fits into a groove formed in the base to form a rim/groove interface with the piston unit being movable relative to the base by pressure exerted by fluid in the nip region of the cartridge in order to generate clamping forces which remain higher than separating forces exerted at the nip region and thereby oppose the opening up of the injection cage and the cartridge support relative to one another during pressurizing, and wherein the pressure chamber is at least partially occupied by an incompressible elastic thrusting means to seal the chamber at the rim/groove interface. 18. The device according to claim 17, wherein the piston unit comprises a nip surface having radial grooves and a width smaller than 1 mm. 19. The device according to claim 17, wherein the piston unit comprises a nip surface that forms discontinuous pressure surface portions for pressing against the nip region of the cartridge. 20. The device according to claim 17, wherein the incompressible elastic thrusting means is made of a silicone or elastomeric material that absorbs forces and transmits the forces to the piston unit and is configured to reduce the volume otherwise occupied by the fluid in the pressure chamber.