US 4,307,289 AGranted

Contact lens disinfecting unit

AssigneeRyder International Corporation

InventorsMichael D. Thomas, Francis E. Ryder

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Abstract

The present invention relates to a thermal disinfecting unit for the disinfecting of a pair of contact lenses disposed within a lens case along with a quantity of disinfecting solution, wherein disinfecting is achieved upon the heating of the solution to a prescribed temperature. The unit as disclosed includes an outer casing made up of upper and lower assembled sections, with an internal heating arrangement disposed therein including a substantially planar lens case support surface. Aperture means are provided in the upper casing section and disposed in relation to the support surface to define a heater well for reception of the lens case. In one embodiment, the aperture means is defined by inwardly extending flange, with a gasket carried thereon, such that as the respective casing sections are drawn together, the gasket will firmly engage the planar support surface to seal the heater well from the interior of the unit. In a second embodiment, a lateral aperture is provided whereby engagement of the lens case with the support surface is attained by a sliding action which serves to wipe the support surface clear of any granular or crystalline substance which may have formed thereon. In addition, the disclosure contemplates an internal heating mechanism designed and constructed, so that the support surface will be heated to a desired temperature and will remain at said temperature for a period of time, before there is any likelihood of operation of a thermostatic device, also carried by said heater block.

Claims24

Dependent claims

A contact lens disinfecting unit for the thermal disinfecting of a pair of contact lenses or the like disposed within a lens case and immersed in a disinfecting solution contained within the case, said disinfecting unit comprising an outer casing including upper and lower casing sections, and heater means disposed internally of said casing, which heater means includes a heater block having a substantially planar support surface, and circuit means for effecting controlled resistive heating of said heater block, said circuit means includes a resistive type heating element, and a thermostat device in circuit with said heating element for de-energizing said heating element when said thermostat reaches the preset temperature and said thermostat device being manually resetable to energize said heating element, and said heater block including a primary segment having said support surface thereon, with a recess formed in said primary segment with said resistive heating element received in said recess in heat conductive engagement therewith for transmitting heat to a lens case resting on said support surface, and said heater block further including an extension segment, integral with and extending from said primary segment and having said thermostat device disposed thereon, said extension segment being disposed on the side of said support surface opposite said heating element, and being of substantially less size and mass than said primary segment, such that the rate of heat transfer to said thermostat device through said heater block wil be less than the rate of heat transfer to said support surfaces, thereby assuring that said support surface reaches a desired temperature and remains at that temperature for a period of time, before said thermostat device is actuated to de-energize said heating element, said upper casing section having aperture means including an inwardly extending flange portion, which aperture means overlies said planar support surface and defines therewith a heating well adapted to receive a lens case therein, with said lens case disposed in heat conductive engagement with said heater block support surface, said inwardly extending flange portion including a peripheral groove, and a gasket member disposed in said groove and extending axially beyond said flange portion in facing relation to said planar support surface, and means for assembling said upper and lower casing sections, which draw said sections together bringing said gasket into compressed engagement with said planar support surface, thereby effectively sealing said lens case well from the interior of said casing and preventing the entry of any liquid to the interior of said casing which could adversely effect said circuit means.

A contact lens disinfecting unit for the thermal disinfecting of contact lenses disposed within a relatively flat lens case, along with a quantity of disinfecting solution, said disinfecting unit comprising:

a casing;
heater means disposed internally of said casing and including a thermally conductive support surface for a lens case, said heater means further including a resistive type heating element, and a thermostat device in circuit with said heating element for de-energizing said heating element when said thermostat reaches the preset temperature and said thermostat device being manually resetable to energize said heating element, and a heater block including a primary segment having said support surface thereon, with a recess formed in said primary segment with said resistive heating element received in said recess in heat conductive engagement therewith for transmitting heat to a lens case resting on said support surface, and said heater block further including an extension segment, integral with and extending from said primary segment and having said thermostat device disposed thereon, said extension segment being disposed on the side of said support surface opposite said heating element, and being of substantially less size and mass than said primary segment, such that the rate of heat transfer to said thermostat device through said heater block will be less than the rate of heat transfer to said support surfaces, thereby assuring that said support surface reaches a desired temperature and remains at that temperature for a period of time, before said thermostat device is actuated to de-energize said heating element a lateral opening formed in said casing of a size to permit a lens case to be disposed therein by movement laterally of said support surface, said lateral opening and said lens case support surface being disposed such that upon disposition or removal of a lens case the resulting relative lateral movement will cause the bottom of said case to slide over said support surface with a wiping action which serves to remove any granular or crystalline material which may have formed on said support surface and which might prevent flush surface-to-surface heat conductive contact between said lens case and support surface.

A contact lens disinfecting unit for the thermal disinfecting of a pair of contact lenses disposed within a lens case and immersed in a disinfecting solution contained within the case, said disinfecting unit comprising, a casing structure, and heater means disposed internally of said casing, which heater means includes a heater block providing a substantially planar support surface, and circuit means for effecting controlled resistive heating of said heater block, said casing structure including aperture means adapted to receive a lens case therein, with said lens case disposed in heat conductive engagement with said heater block support surface, said circuit means including a resistive type heating element, and a thermostat device in circuit with said heating element for de-energizing said heating element when said thermostat reaches the preset temperature and said thermostat device being manually resetable to energize said heating element, and said heater block including a primary segment having said support surface thereon, with a recess formed in said primary segment with said resistive heating element received in said recess in heat conductive engagement therewith for transmitting heat to a lens case resting on said support surface, and said heater block further including an extension segment, integral with and extending from said primary segment and having said thermostat device disposed thereon, said extension segment being disposed on the side of said support surface opposite said heating element, and being of substantially less size and mass than said primary segment, such that the rate of heat transfer to said thermostat device through said heater block will be less than the rate of heat transfer to said support surfaces, thereby assuring that said support surface reaches a desired temperature and remains at that temperature for a period of time, before said thermostat device is actuated to de-energize said heating element.

a casing structure including upper and lower casing sections, and heater means disposed internally of said casing, said circuit means for effecting control of the operation of said heater means, said circuit means including a resistive type heating element, and a thermostat device in circuit with said heating element for de-energizing said heating element when said thermostat device reaches the preset temperature and said thermostat device being manually resetable to energize said heating element, and said heater block including a primary segment having said support surface thereon, with a recess formed in said primary segment with said resistive heating element received in said recess in heat conductive engagement therewith for transmitting heat to a lens case resting on said support surface, and said heater block further including an extension segment, integral with and extending from said primary segment and having said thermostat device disposed thereon, said extension segment being disposed on the said of said support surface opposite said heating element, and being of substantially less size and mass than said primary segment, such that the rate of heat transfer to said thermostat device through said heater block will be less than the rate of heat transfer to said support surfaces, thereby assuring that said support surface reaches a desired temperature and remains at that temperature for a period of time, before said thermostat device is actuated to de-energize said heating element, said circuit means further including a terminal arrangement comprised of a non-conductive plate member with male terminal elements carried by said plate member and extending from said plate member exteriorly of said casing for connection with a conductor having a cooperating female type connector thereon, said terminal arrangement further comprising partial, complementary aperture means formed in both said upper and lower casing sections, each said aperture means including inwardly facing slot means, such that when said casing sections are assembled, there is provided a complete aperture therein surrounded by said slot means, and said plate member being received in said slot means to close said aperture, and thereby prevent access to the interior of said casing through said aperture.

A contact lens disinfecting unit for the thermal disinfecting of a pair of contact lenses or the like disposed within a lens case and immersed in a disinfecting solution contained within the case, said disinfecting unit comprising an outer casing including upper and lower casing sections, and heater means disposed internally of said casing, which heater means includes a heater block having means for accommodating a lens case in heat conductive association therewith, and circuit means for effecting resistive heating of said heater block, said circuit means including a resistive type heating element, and a thermostat device in circuit with said heating element for de-energizing said heating element when said thermostat reaches the preset temperature and said thermostat device being manually resetable to energize said heating element, and said heater block including a primary segment having said support surface thereon, with a recess formed in said primary segment with said resistive heating element received in said recess in heat conductive engagement therewith for transmitting heat to a lens case resting on said support surface, and said heater block further including an extension segment, integral with and extending from said primary segment and having said thermostat device disposed thereon, said extension segment being disposed on the side of said support surface opposite said heating element, and being of substantially less size and mass than said primary segment, such that the rate of heat transfer to said thermostat device through said heater block will be less than the rate of heat transfer to said support surfaces, thereby assuring that said support surface reaches a desired temperature and remains at that temperature for a period of time, before said thermostat device is actuated to de-energize said heating element, said lower casing section including a bottom wall and a plurality of support members formed integral with said bottom wall and extending upwardly therefrom, with said heater block resting upon said support members and disposed in spaced relation with respect to said bottom wall, thereby providing an air insulation barrier between said heater block and said bottom wall.

Dependencies are inferred from the claim text.