Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
  • A61B18/02—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques
  • A61B18/0218—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques with open-end cryogenic probe, e.g. for spraying fluid directly on tissue or via a tissue-contacting porous tip

Definitions

• the present invention relates to the field of fluid delivery devices comprising an aerosol.
• the present invention relates more particularly to a device for delivering cold fluid for medical use, for self-medication, for care, for comfort or for relief intended to act on all pathologies relating to a treatment of cryotherapy and or cryosurgery, for dermatological use, care, comfort, aesthetics, well-being, for all the benefits of cold in its physiological and mechanical qualities.
• US Pat. No. 5,098,428 which describes a cryosurgical instrument in contact with a liquefied refrigerant gas contained in a thermally insulated container. When interrupting the normal venting of the container, the pressure of the liquefied refrigerant gas can be increased in the container by means of a balloon.
• the device includes: a container for holding the liquid refrigerant; a normally closed valve connected to said container; and actuating means for temporarily opening the valve, comprising positioning means for positioning at least part of the delivery element, so that the refrigerant leaving the valve can reach the element 'administration.
• the positioning means comprises a chamber which is connected to the valve and into which the refrigerant is introduced during the actuation of the valve, this chamber being designed to receive at least part of 1 ' element of administration.
• a device for carrying out a therapeutic treatment such as the removal of warts, on a part of the skin of a human or animal body by local freezing
• this device comprising a container.
• sprayer which contains a coolant which boils in the temperature range from 0 ° to -50 ° C
• a pressure reduction and closing valve to be operated with a finger on a terminal wall of the spraying container, this valve being provided with a supply tube which extends into the liquid phase of the refrigerant and a discharge tube connected at one end to an outlet of the valve, characterized in that the second end of the discharge tube is provided with a cotton swab which is placed downstream of an outlet of the second end of the tube and around the outer surface of the second end, so that the flow of refrigerant to the outside takes place through the cotton pad when the valve is actuated.
• the delivery device comprises a therapeutic fluid used for example for dermatological treatments (dark spots, warts and / or other skin infections).
• a cold fluid is delivered to a particular area, but this fluid must not damage neighboring areas or be applied too long or not long enough to the area to be treated.
• these treatments presuppose the use of a cold vehicle support (buffer) coming into contact with the parts to be treated.
• the present invention intends to remedy the drawbacks of the prior art by proposing a fluid delivery device thanks to which the user cannot vary the duration of exposure on the area to be treated and does not have to determine himself, conventionally by pressure on the head of an aerosol, the time and the quantity to be delivered, that is to say in the case of therapeutic treatments, the duration of exposure.
• this device meets specific security needs because a child cannot use it, the press button, thanks to the spring which is provided with it, equipping the device being adjusted to operate only when pressure is applied to the less equal to 3 daN (30 Newtons).
• the user can only apply a single dose because the press button remains inactive, until it is unlocked, as soon as a first pressure has been applied and this until the delivery of the quantity (and time) of predetermined fluid.
• the delivery device only the part to be treated receives the only cold, without alteration by a support or vehicle, benefiting from all its qualities for the physiology of the body and its own characteristics.
• the present invention relates to an automatic fluid delivery device, of the type comprising a container provided with a fluid reserve in the form of an aerosol and a system for triggering the release of the fluid from the reserve, characterized in that the system for triggering the release of the fluid cooperates with means ensuring the delivery of a predetermined quantity of the fluid, for a predetermined duration, over an area whose extent is predetermined.
• the trigger system comprises a press button, a plurality of springs, at least one cam and one piston, said means being constituted by a sealed pressure chamber having at least one leak orifice for releasing the pressure of the pressure chamber when the latter is higher than atmospheric pressure, the depressing of the press button acting, via the cam and the piston, to increase the pressure in said chamber acting on the aerosol.
• the leak orifice will consist of an opening of variable diameter, for example by tightening / loosening a screw.
• the leak orifice will have a fixed or invariant diameter.
• the diameter of the leak orifice was chosen according to the needs relating to the delivery of the fluid, in terms of quantity delivered and / or delivery time. for example according to a therapeutic treatment.
• the diameter of this leak orifice is previously fixed / defined at the time of production / manufacture of the delivery device according to the invention.
• the device of the invention will include an actuator, in contact with the aforesaid cam, having a plurality of protrusions and able to be brought into the locked position following a pressure exerted on the press button.
• the cam will have an oblique part capable of driving the rotation of the actuator when pressure is exerted on the press button.
• the cam will comprise an oblique portion cooperating with a protuberance of the actuator during the pressure exerted on the press button.
• the pressure chamber will comprise at least one spring compressing during the pushing of the piston to act on the aerosol which consequently releases fluid.
• the device of the invention may include a stop element capable of stopping the translation of the actuator.
• the actuator comprises, at its opposite end, at least one protuberance cooperating with at least two oblique parts of the piston to effect the translation of said piston following the pressure exerted on the press button.
• the device comprises a nozzle, arranged at one of its ends, for example of substantially frustoconical shape.
• the tip will be at least partially transparent and / or perforated so as to facilitate the placement of said tip.
• the aerosol will comprise a valve provided with an internal pocket or with a ball capable of authorizing the delivery of fluid whatever the position of the device.
• the present invention also relates to a device for delivering a fluid for medical use relating to a cryotherapy and / or cryosurgical treatment, said device being as defined above, characterized in that the aerosol releases a fluid at a temperature between -20 and -65 degrees.
• This device is used for any physiological or mechanical action of cold on dermatological pathologies
• the fluid will be dimethyl ether or any other cold product acting for a cryotherapy or cryosurgery treatment, for example to relieve acute pain or treat a brown spot with a cold burn, and all pathologies in general. which cold has a therapeutic, beneficial, regressive, or relieving effect.
• the container will consist of an elongated body having a diameter between 20 and 25 millimeters (mm).
• the present invention also relates to a process for the automatic delivery of a fluid for a predetermined period by means of a device as defined above, comprising a step of triggering by a user consisting in pressing a press button, characterized in that that it comprises the following stages: sliding of a piston on or in a pressure chamber so as to increase the pressure prevailing in said chamber, pressure of at least one spring, present in said pressure chamber, pressure of said chamber pressure on the aerosol (air + spring), - delivery of fluid by the aerosol, leakage of gas contained in the pressure chamber through at least one orifice so as to restore a pressure close to atmospheric pressure in said chamber, sliding of the piston under the action of the actuator, rotation of the actuator canceling the pressure on the aerosol so that the latter stops d deliver the fluid.
• the duration of delivery of the fluid will be variable by adjusting the diameter of the opening of the leakage orifice.
• the duration of delivery of the fluid will be invariable by calibrating a leak orifice.
• the method of the invention will include a complementary rearming step, or unlocking, of the device when the pressure in the pressure chamber has returned close to or equivalent to atmospheric pressure.
• the method according to the invention will include a step of locking the device, thanks to an actuator and a stop element, during which the press button will be inactive.
• the press button will become active again after the unlocking step.
• FIG. 1 illustrates a perspective view of the device according to the invention, the container being opened and separated into two halves, lower and upper, to view the elements present in the device, the aerosol as well as the pressure chamber being visible by means of an oblique cut
• FIG. 2 illustrates a partial perspective view of the lower half of the container without the press button, its spring and the cam
• Figure 3 illustrates a perspective view of Figure 2 when the delivery device delivers or ejects a certain amount of fluid.
• the delivery device according to the invention has an elongated shape, substantially identical to that of a pen.
• the choice of the valve fell, in the example chosen to illustrate the invention, on a valve, equipping the aerosol, having a diameter of 20 millimeters, and not 25.4 mm; these two diameters representing the two conventional valve sizes for an aerosol.
• the device according to the invention comprises a container 1, external body or envelope, in which are housed all of the elements mentioned below, and which makes it possible to protect the entire mechanism of the device, in particular against impact.
• the device of the invention has two ends, at which there are respectively a press button 2 and a nozzle 3.
• the press button 2 has a conventional cylindrical shape and accommodates in its hollow or empty interior, a spring 4 and a cam 5; the spring 4 being disposed between the internal face of the press button 2 and the external face of the cam 5.
• the cam 5 is in two main parts, both cylindrical, the first around which is the spring 4 and the second having a diameter greater than the first part and the end of which has an oblique slope, or section.
• the cam 5 and the actuator 6 are free in rotation while only the piston 7 is free in translation.
• the actuator 6 comprises a plurality of protrusions 8 arranged on its cylindrical periphery.
• a stop element 9 is present between the casing body 1 and the actuator 6 to stop the translation of the actuator 6, and therefore the translation of the piston 7.
• the piston 7 is in contact with the other end of the actuator 6, this end of the actuator having a protuberance 10 extending perpendicular to the longitudinal direction of the end of the actuator 6.
• the end of the piston 7 in contact with the end of the actuator 6 has respectively a particular section, namely two oblique parts 11, 11 'forming between them substantially a V, that is to say that these two oblique parts 11, 11 'have an opposite or opposite slope. At the intersection of these two parts 11, 11 ', or slopes, oblique is a point of immobilization of the protuberance.
• the actuator 6 rotates, it rotates the protrusion 10 which slides on the first slope 11 or oblique part of the end of the piston 7 until it stops before the intersection of the two slopes.
• the piston 7 is in the process of moving back, to return to its initial position, that is to say its position before the pressing of the press button 2.
• the piston 7 is followed by a pressure chamber 12 in which houses a spring 13 joining one of the ends of the piston 7 to the internal face of the end of the aerosol 14.
• the air contained in this chamber 12 compresses and its stiffness, or pressure, increases until it becomes greater than the stiffness of the spring contained in the valve 15, aerosol 14 opens.
• this orifice has a cylindrical shape of variable diameter thanks for example to a screw that a user can tighten or loosen to increase or decrease the diameter of this orifice, which has the consequence of reducing or increasing the rate of recovery of a pressure close to or equivalent to atmospheric pressure inside the pressure chamber 12.
• the orifice has an invariable diameter, the device not having a tightening / loosening screw to adjust the diameter of this orifice.
• the delivery device uses a pneumatic timer based on an air leak, practiced in a chamber 12.
• This chamber is ideally interposed between the piston 7 and the aerosol canister 14.
• a trigger push button 2 is positioned at the end of the pen-shaped device.
• the user presses this button 2 until it automatically locks at the end of the stroke.
• the “pen” cannot be re-triggered before the ejection of the gas has ended, button 2 being locked during this phase.
• the button 2 depressing phase nothing happens at the aerosol 14 opening mechanism.
• the dispensing process or the opening and closing kinematics of the aerosol 14 is divided into five phases, respectively the triggering by the user, the opening of the aerosol 14, the timer and the closing of the aerosol. 14, and rearming the system.
• the user triggers the mechanism by pressing push-button 2.
• Spring 4 compresses.
• the nipples 16 open into a chamber, which frees the rotation of
• the rotation of the actuator 6 causes the translation of the piston 7 by means of a cam 5.
• the spring 13 is compressed as well as the air contained in the pneumatic chamber 12.
• the assembly 7/12/13 ensures the translation and
• the pneumatic chamber 12 has a calibrated hole which allows an air leak and therefore a pressure loss over time.
• the piston 7 advances under the force maintained by the actuator 6.
• the protuberance of the actuator 6 shifts and is found at the right of the slope 11.
• the piston 7 rises, driving in its ascent the actuator 6 in rotation, by means of the slope 11 '.
• the ascent of the piston 7 releases the pressure on the aerosol 14.
• the spring contained in the valve 15 closes the aerosol 14.
• the spring 13 then pushes the piston 7 back into its initial position, causing the actuator 6 to rotate, which then pushes on the cam 5 contained in the push-button 2.
• the push button 2 goes back to the initial position.
• the system can be used for a new application. Once the press button 2 is locked, a cam mechanism, compressed by the spring 4 contained in the push button 2, then begins to rotate, advancing the piston 7. This piston 7 pushes on the aerosol 14, this which compresses the valve 15 and opens it.
• the nozzle 3 of the aerosol 14 must be at a constant distance from the area to be treated.
• the tip 3 of the device performs this spacer function between the patient's skin and the diffusion tip.
• This spacer has an ideally conical shape with an extreme diameter greater than the wart, to be treated.
• the end piece 3 is at least partially transparent and perforated.

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• Health & Medical Sciences (AREA)
• Surgery (AREA)
• Life Sciences & Earth Sciences (AREA)
• Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
• Medical Informatics (AREA)
• Engineering & Computer Science (AREA)
• Biomedical Technology (AREA)
• Heart & Thoracic Surgery (AREA)
• Otolaryngology (AREA)
• Molecular Biology (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
• Nozzles (AREA)

Applications Claiming Priority (2)

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• 2003
  • 2003-07-31 FR FR0309463A patent/FR2858303B1/fr not_active Expired - Fee Related
• 2004
  • 2004-07-30 CA CA002534209A patent/CA2534209A1/fr not_active Abandoned
  • 2004-07-30 WO PCT/FR2004/002062 patent/WO2005011560A2/fr active Application Filing
  • 2004-07-30 EP EP04767826A patent/EP1648323A2/de not_active Withdrawn
• 2006
  • 2006-01-30 US US11/343,277 patent/US20060213509A1/en not_active Abandoned

Non-Patent Citations (1)

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