# Patent

## Title
Safety system for electrostimulation device

## Abstract

A housing for an electrostimulation device comprising a charger plug and a stimulation plug, designed to receive respectively a connector linked to a charger and a connector linked to a stimulation electrode, characterized in that it comprises a mobile locking element designed to alternately lock the charger plug or the stimulation plug.

## Background
RELATED APPLICATION
This application claims priority to PCT Application No. PCT/IB2005/050048 filed Jan. 5, 2005, and Swiss Patent Application No. 0040/04 filed Jan. 12, 2004.
BACKGROUND OF THE INVENTION
The present invention relates to the field of electrostimulation devices, in particular muscular electrostimulation devices.
More specifically, it relates to those electrostimulation devices that comprise a housing provided with at least one charger plug and one stimulation plug.
DESCRIPTION OF THE PRIOR ART
A number of styles of housings for electrostimulation devices are presented on the web site of the applicant (www.compex.info).
Normally, a housing for an electrostimulation device comprises a charger plug and a number of stimulation plugs designed to respectively receive a connector linked to an external charger and a number of connectors linked to stimulation electrodes.
The housing comprises an accumulator battery that is chargeable by direct current via the charger plug.
The electrostimulation is produced by means of electrodes applied to the skin of the user.
The stimulation current is limited to a few tens of milliamps (normally 120 mA maximum for a pulsed current).
A major risk is run by the user when the housing is linked both to the mains through the charger and to the user through the electrodes. In this configuration, if a fault were to occur in the external charger (insulation fault, component fault, etc.), the user could be directly linked to the mains voltage, which represents a mortal hazard. In practice, a link with the mains can provoke a cardiac fibrillation, a fainting fit, burns, pains, etc.
The housing disclosed in U.S. Pat. No. 4,421,001 offers a solution to this problem. It comprises a single plug that can operate alternately as a charger plug or a stimulation plug.
This solution does, however, present a number of drawbacks: it is not suited to housings that include a number of stimulation plugs and, furthermore, producing the dual-function plug is relatively complicated.
SUMMARY OF THE INVENTION
One objective of the invention is to increase the safety of the electrostimulation devices.
Another objective is to also offer a high level of safety for housings that include a number of stimulation plugs.
These objectives are achieved with a housing for an electrostimulation device that comprises a charger plug and a stimulation plug, designed to receive respectively a connector linked to a charger and a connector linked to stimulation electrodes. The housing according to the invention is characterized in that it also comprises a mobile locking element designed to alternately lock the charger plug or the stimulation plug.
The presence of the mobile locking element makes either the charger plug or the stimulation plug(s) available. The simultaneous availability of both types of plug is then impossible.
Particularly advantageous embodiments include a housing for an electrostimulation device that has a charger plug and a stimulation plug. The housing includes a mobile locking element that is designed to alternately lock the charger plug or stimulation plug. In another implementation, the mobile locking element presents an inclined surface inside the charger plug. Insertion of a connector into the charger plug exerts a force to displace the mobile locking element to lock the stimulation plug. In another implementation, the mobile locking element presents an inclined surface inside the stimulation plug. Insertion of a connector into the charger plug exerts a force to displace the mobile locking element to lock the charger plug. In another implementation, the charger plug and the stimulation plug are located on two opposite sides of the housing. The mobile locking element follows a curvilinear path. In another implementation the mobile locking element may include a thrust element which be activated by a user to release a plug.
Moving the mobile element from one position to the other can be done either manually, for example using a thrust element that the user moves, or as a consequence of inserting a connector into the plug that is blocked. In the latter case, the locking element comprises an inclined surface that is made apparent in the plug. When the connector is inserted into the plug, a force is exerted on the inclined surface, which causes the locking element to be displaced.
The invention will be better understood from reading the detailed description that follows and examining the appended drawings which represent, by way of nonlimiting example, an embodiment of the invention.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 presents a first embodiment of the invention with stimulation plugs available.
FIG. 2 presents the housing of FIG. 1 with a charger plug available.
FIG. 3 diagrammatically presents a locking principle according to the invention with stimulation plugs available.
FIG. 4 presents the object of FIG. 3 with a charger plug available.
FIG. 5 presents a second embodiment of the invention.
FIG. 6 presents a third embodiment of the invention with a stimulation plug available.
FIG. 7 presents the object of FIG. 6 with a charger plug available.
FIG. 8 presents a third embodiment of the invention with stimulation plugs available.
FIG. 9 presents the object of FIG. 8 with a charger plug available.
FIG. 10 presents a fourth embodiment of the invention with stimulation plugs available.
FIG. 11 presents the object of FIG. 10 with a charger plug available.



DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the various FIGS. 1-11, illustrated are a housing 1, a charger plug 2, a stimulation plug 3, a mobile locking element 4, a locking element of the charger plug 5, a locking element of the stimulation plug 6, a thrust element 7, and an inclined surface 8.
The housing 1 represented in FIGS. 1 and 2 comprises a charger plug 2 and four stimulation plugs (each indicated by reference numeral 3).
FIGS. 3 and 4 diagrammatically represent in particular the design illustrated in FIGS. 1 and 2. The housing comprises two mobile locking elements 4a and 4b in strip form, which can be displaced in a direction parallel to the line passing through the plugs 2, 3. Each of strips 4a and 4b comprises a series of teeth 6 designed to lock the stimulation plugs 3. The end of each strip 4a and 4b which culminates in the charger plug 2 comprises an inclined surface 8. When the charger connector is inserted into the corresponding plug 2, a force is exerted on the inclined surface 8, which drives the strips towards the stimulation plugs 3, simultaneously locking their access.
Preferably, springs (not shown) are associated with the locking strips 4a and 4b. They are located so as to return the locking strips 4a and 4b when all the connectors are removed from the housing 1.
The locking elements 6 can take the form of teeth, as indicated previously. Alternatively, the locking strip 4 can include orifices (not shown) through which the plugs can pass. In this case, the locking elements are formed by the strip elements that are located between the orifices.
The embodiment diagrammatically illustrated in FIG. 5 comprises a locking rod 4 which pivots about its main axis. The locking elements 6 are angularly separated by 90° so that the charger 2 and stimulation plugs 3 are alternately locked.
The embodiment of FIG. 6 also presents a locking rod 4 that pivots, but in a direction perpendicular to the main axis of the rod. In the embodiment of FIGS. 8 and 9, the charger plug 2 is located on a side of the housing 1 opposite to that where the stimulation plugs 3 are located. The mobile locking element 4 is formed by a semi-rigid tab, which is moved in response to the force exerted on the inclined surface 8 by the charger connector.
The embodiment of FIGS. 10 and 11 presents a mobile locking element 4 that is mobile in a vertical direction. In the configuration illustrated in FIG. 2, a spring (not shown) holds the mobile element 4 in a bottom position (rest position). The upward movement of the mobile element 4 is obtained manually through the intermediary of a thrust element 7 that the user must push upward.
The locking element 5 of the charger plug 2 is in the form of an inverted L. Four locking elements 6 for stimulation plugs 3 are located along the mobile locking element 4, perpendicular to the latter.
In the rest position (FIG. 10), the locking element of the charger plug 5 blocks the charger plug 2. The stimulation plugs 3 are available and can accommodate stimulation connectors.
If the user wants to insert the charger plug, he must first remove the stimulation connectors, push the thrust element 7 upward and insert the power supply connector.
Once this operation is completed (FIG. 11), the stimulation plugs are blocked by the corresponding locking elements 6.
According to the variant of the invention that is not shown, the thrust element 7 is eliminated. In this case, the locking element 5 of the charger plug 2 comprises an inclined surface of a form and function identical to that described previously.
Obviously, the invention is not limited to the above-mentioned examples.

## Claims

1. A housing for an electrostimulation device comprising:
a charger plug configured to receive a connector linked to a charger;
a stimulation plug configured to receive a connector linked to a stimulation electrode;
an elongate member configured to adopt a first configuration and a second configuration with respect to the charger and stimulation plugs;
wherein the elongate member at least partially covers the charger plug but not the stimulation plug when the elongate member is in the first configuration, and the elongate member at least partially covers the stimulation plug but not the charger plug when the elongate member is in the second configuration.

2. The housing as claimed in claim 1, comprising a plurality of stimulation plugs, wherein the elongate member at least partially covers the charger plug but not the plurality of stimulation plugs when the elongate member is in the first configuration and at least partially covers the plurality of stimulation plugs but not the charger plug when the elongate member is in the second configuration;
wherein the elongate member is configured to transition between the first configuration and the second configuration in a single action.

3. The housing as claimed in claim 1, wherein the elongate member comprises an inclined surface, located in a first plug that is one of the charger plug and the stimulation plug, and arranged so that a connector inserted into said first plug exerts a force on the inclined surface to displace the elongate member to at least partially cover the other of the charger plug and the stimulation plug.

4. The housing as claimed in claim 3, wherein the elongate member includes a plurality of portions, said elongate member is configured to be mobile in a direction parallel to a plane passing through the charger plug and the stimulation plug, and a first of the plurality of portions of the elongate member is disposed on the elongate member so as to at least partially cover the charger plug but not the stimulation plug in the first configuration and to a second of the plurality of portions of the elongate member is disposed on the elongate member so as to at least partially cover the stimulation plug but not the charger plug in the second configuration.

5. The housing as claimed in claim 4, wherein the inclined surface is located at one end of the elongate member.

6. The housing as claimed in claim 3, wherein the charger plug and the stimulation plug are located on two opposite sides of the housing, a first surface of the housing is configured in a curvilinear shape, the elongate member is composed of a semi-rigid material and configured to be mobile along a curvilinear path defined by the first surface of the housing between the charger plug and the stimulation plug.

7. The housing as claimed in claim 1, wherein the elongate member comprises a rod provided with protrusions disposed on the rod and said rod is mounted to the housing by a pivot.

8. The housing as claimed in claim 7, wherein the rod has a first end, a second end, and a main axis, and wherein the rod is mounted to pivot about a main axis along a length of the rod and the protrusions are disposed on the road toward at least one of the first end and second end of the rod.

9. The housing as claimed in claim 7, wherein the rod is mounted to pivot about an axis directed perpendicular to a main axis along a length of the rod and the protrusions are disposed along the length of the rod.

10. The housing as claimed in claim 1, wherein the elongate member is configured to be displaced in a direction substantially perpendicular to a line on which the charger plug and stimulation plug are located.

11. The housing as claimed in claim 10, wherein the elongate member is provided with protrusions disposed along the length of the elongate member.

12. The housing as claimed in claim 10, wherein the elongate member comprises a handle, wherein activation of the handle causes the elongate member to adopt one of the first configuration and the second configuration.