Loupe system

Abstract

A head strap 20 comprising two tubes (30 & 32, fig 3) of flexible wipe‐clean material and connectable magnets 34, 36 located on each tube. The head strap may be suitable for medical loupe glasses 12. The head strap may comprise a smooth outer surface and a connector block 138 having adjustable weight and two removably connectable parts comprising pegs and holes. The flexible wipe‐clean material may be silicone. The magnets may be moveable and comprise flat, disc-shaped faces. The magnets may be located on toggles (134 & 136, fig 6) slidable over the tubes wherein the faces of the magnets may be parallel to the head strap and the toggles are connected to the magnet faces via screws. The head strap may comprise a stopper on the end of at least one tube wherein the stopper has a flared end. The connector block may comprise cavities configured to accommodate and anchor the stoppers. The toggles, connector block and stoppers are removably connectable from the tubes wherein the tubes are configured to attach to temple arms of the loupes and comprise a textured internal surface to engage with temple arms of loupes.

Description

06 09 24 Field of the Invention The present invention relates broadly to vision aids, and more specifically to retaining corrective lenses on the head of a person. 5 Background of the Invention Loupes are small magnification devices used to see small details more closely. As dental professionals use both hands in performing dental procedures, dental loupes are binocular and usually take the form of a pair of glasses. Loupes are worn by dentists not only to increase the details that can be seen, but also to improve 10 posture by avoiding slouching to view inside a mouth. Many dentists mount a headlight, with an associated battery pack, on the loupes to increase visibility. Loupes are supplied 'fitted' to the dentist's face and can be supplied with prescription lenses for vision correction. Loupes are also common in other professional sectors such as surgery and single eyeglass loupes in professional sectors such as jewellery, geology and printing. 15 Many dentists use common eyewear head straps, also known as retainers, lanyards or straps, attached to the temples (the arms) of the loupe frames. Dentists attach head straps to prevent the loupes from falling and becoming damaged as well as, in the case of head straps with an adjustable length, securing the loupes more tightly on the face to prevent them slipping down the nose bridge when looking down or becoming unsettled as the dentists moves his head up or down or rotates left / right. 20 The risk of loupes slipping off a face is much greater than that of wearing normal eyewear as the loupes are heavier because of the magnification lenses and optional headlight, and also because the loupes are unbalanced and have a heavier weight load on the nose pads - due to the mounting of the lens and headlight - compared to the temples. Technology is progressing to reduce the weight of loupes, however at the same time technology 25 advancements mean that higher magnification loupes are becoming available with longer and heavier lenses. 06 09 24 In 1942 Corcoran (US Patent 2,270,931) disclosed a method of supporting heavy optical instruments over eyes. By holding the heavy optical instruments using a pair of parallel bars, which are hinge mounted to head gear comprising two or three fixed length, elongated straps pivotally attached to each other and mounted over the head, the weight of the instruments is spread over the head. This 5 arrangement also provides a hands-free method to ensure the optical instruments are always positioned over the eyes pointing forwards as the head moves. Later in 1955 Schmidt (US Patent 2,935,910) disclosed a method to construct a headband loupe for doctors and other workers in which the lenses, lens holders and other parts of the loupe are made removable and interchangeable to change the level of magnification and also accommodate people 10 wearing glasses behind the lenses. The loupe is secured using rivets to an elasticated headband fastened with buckles or snaps around the circumference of the head. The use of buckles or snaps allows the headband to be adjusted to ensure a tight fit, and the use of an adjustable bolt between the headband and the lens holders allows for the loupe to be tilted upwards away from the eyes when not required. Price (US Patent 4,234,910) in 1978 disclosed a method to construct a head supported illumination 15 device consisting of the mounting of fibre optics from a light generating machine onto the temples of existing glasses for physicians and surgeons. To secure the frame of the glasses, an adjustable elasticated strap is used to secure them to the back of the head. The strap is attached to the temples using a rubber loop attached to the end of the temple and is adjusted using a buckle. Bastable and Goldberg (US Patent 4,807,987) in 1986 disclosed a method to mount an interchangeable 20 set of loupe lens together with a fibre optic light source for ear, nose and throat surgery. The mounting is attached to an upholstered, adjustable headband around the circumference of the head together with an additional strap over the top of the head to allow comfortable use for a number of hours and allow adjustments for individual head sizes using fasteners as well as brackets to position the viewing system and light system in front of the user's eyes. 25 Later in 1994 Sherlock (US Patent 5,548,841) disclosed a method to construct a headband for a loupe using a one-piece polypropylene headband that provides an easy method to quickly slip the loupes on and off the head, together with a compression force that provides a method to secure the loupe for all head sizes. Qingfeng (China Patent CN2215728Y) in 1994 disclosed a method to mount magnification lenses with 30 variable magnification on a frame attached to the head using an adjustable rubber belt. This has the 06 09 24 benefit of being smaller than traditional loupes and allowing variable magnification. The rubber belt is simple to adjust. Donny's application in 2019 (WIPO Patent Application PCT / US2019013777) disclosed a method to build a head strap for a standard pair of loupes available for sale from various manufacturers using two 5 monofilaments which are attached to the temples of the loupes using an elasticated coupler. The monofilaments pass through a tight sleeve near each of the temples, with a stopper made of rubber or plastic on the other end. The sleeve allows for size adjustment and the monofilament loop from each temple passes over the back of the head. The method provides an adjustable head strap for existing loupes which is very light weight and displaces the weight of the loupes to the back of the head. The use 10 of monofilaments makes the loop more hygienic and easier to clean. While these examples provide methods to construct loupe and headband combinations and also methods to manufacture a headband to attach a standard pair of loupes to a head to displace the weight of the loupes over the head, and to securely attach the magnification lenses so that they remain stable as the head moves, what makes the method in the present application unique from Corcoran, 15 Schmidt, Price, Bastable, Sherlock, Qingfeng and Donny is a method of constructing a head strap for a standard paid of loupes which is hygienic and very easy to disinfect, whilst at the same time being easy and quick to adjust and securely attach to the head, and quickly and securely attach to the temples of a standard loupe. There are no parts which can catch hair or be caught on clothes and the whole surface of the head strap can be simply disinfected using wipes. There is no requirement to adjust for size every 20 time the loupe is placed on the head and the one size head strap is constructed to fit most of the dental and surgical standard loupes available for sale. Summary of the Invention Aspects and embodiments of the present invention are set out in the appended claims. These and other aspects and embodiments of the invention are also described herein. 25 According to a first aspect, there is provided a loupe system comprising: loupe glasses of a first weight comprising: loupe magnification lenses; a nose bridge connecting the loupe magnification lenses; and temple arms; and a head strap comprising: loupe straps connected to the temple arms of the loupes, the loupe straps being formed of flexible wipe-clean material; at least two magnets connectable by magnetic forces to effect reversible securement, wherein at least one magnet is located on each loupe 30 strap; and a connector block of a second weight connecting the loupe straps; wherein the nose bridge is 06 09 24 configured to balance on a wearer's nose, the temple arms are configured to balance on a wearer's ears, and the first weight and the second weight are selected to counterbalance one another. The loupe glasses may further comprise a headlight. As such, in such an implementation, the first weight includes / comprises the combined weight of the loupe magnification lenses and the headlight. 5 Consequently, in this implementation, the second weight is selected to counterbalance the first weight comprising the combined weight of the loupe magnification lenses and the headlight. According to a further aspect, there is disclosed a loupe system comprising: loupe glasses of a first weight comprising: loupe magnification lenses; a nose bridge connecting the loupe magnification lenses; temple arms; and a headlight; and a head strap comprising: loupe straps connected to the temple arms 10 of the loupe glasses, the loupe straps being formed of flexible wipe-clean material; at least two magnets connectable by magnetic forces to effect reversible securement, wherein at least one magnet is located on each loupe strap; and a connector block of a second weight connecting the loupe straps; wherein the nose bridge is configured to balance on a wearer's nose, the temple arms are configured to balance on a wearer's ears, and the first weight and the second weight are selected to counterbalance one another, 15 the first weight comprising the combined weight of the loupe magnification lenses and the headlight. Also disclosed is a loupe system comprising: a loupe comprising: loupe magnification lenses; and temple arms having curved and broadening ends; a head strap formed of flexible material and comprising: at least two magnets; a textured internal surface; and a connector block; wherein the curved and broadening ends of the temple arms and the textured internal surface of the head strap are configured 20 to engage to form a secure connection between the loupe and the head strap; the at least two magnets are connectable by magnetic forces; and the connector block and loupe magnification lenses are configured to act as counterbalances to each other. The invention can provide an improved loupe system, which is more balanced, comfortable and hygienic, and can be quickly and securely attached and detached. 25 The head strap may comprise two tubes. The two tubes may preferably be connected by the connector block. The loupe may further comprise a nose bridge, preferably wherein the nose bridge connects the loupe magnification lenses. 06 09 24 In a preferable implementation, the weight of the connector block can be adjusted. The connector block may be removable and replaceable with a connector block of an alternative weight. This can allow the weight of the loupes to be balanced front to back. The loupe may further comprise a headlight, wherein the connector block has a first weight and the 5 loupe magnification lenses and headlight have a second weight such that the first weight and second weight are configured to act as counterbalances. Also disclosed is a loupe system comprising: a loupe comprising: loupe magnification lenses; a headlight; and temple arms having curved and broadening ends; a head strap formed of flexible material and comprising: at least two magnets; a textured internal surface; and a connector block; wherein the 10 curved and broadening ends of the temple arms and the textured internal surface of the head strap are configured to engage to form a secure connection between the loupe and the head strap; the at least two magnets are connectable by magnetic forces; and the connector block has a first weight and the loupe magnification lenses and headlight have a second weight such that the first weight and second weight are configured to act as counterbalances to each other. 15 Headlights (and associated battery packs) are often used by dentists, which can be heavy and increase the risk of the loupes falling off; this arrangement can allow the weight of the loupes to be balanced front to back. In a preferable implementation, the headlight is reversibly attachable, and the connector block is reversibly attachable such that the weight of the connector block can be adjusted. This can ensure a 20 more stable arrangement. Preferably, the flexible material of (the loupe straps of) the head strap and the curved and broadening ends of the temple arms are configured such that the flexible material stretches to accommodate the curved and broadening ends of the temple arms, and the textured internal surface grips the temple arms, thereby securing connection. 25 Preferably, the textured internal surface comprises raised surface elements, and the flexible material stretches between the raised surface elements to accommodate the curved and broadening ends of the temple arms. The raised surface elements grips the surface of the temple arms, while allowing the flexible material to stretch between the raised surface elements. 06 09 24 Preferably, the position of the at least two magnets is adjustable. The size of the head strap can be adjusted by moving the magnets. Preferably, the magnets have flat faces. More preferably, the magnets have disc-shaped faces. The magnets may be located inside the loupes straps of the head strap. Alternatively, the magnet may 5 be located on toggles slidable over the loupe straps. This can allow the magnets to be moved easily, and the size of the head strap to be thus easily altered. The toggles may be generally cylindrical, and the magnets located on the ends. This can help to prevent hair or clothing becoming tangled. The toggles may be configured such that the faces of the magnets are parallel to the loupe straps. This facilitates connection of the magnets parallel to the loupe straps. The toggles may comprise a hole configured to 10 accommodate the loupe straps, and a dimension of the toggle parallel to the loupe straps is reduced in the region of the hole. This can allow the loupe strap to bend around the toggle. Preferably, the connector block comprises two connectable parts. Preferably the parts are removably connectable. This means the parts can be connected and disconnected, and then reconnected and disconnected and so on. This can allow the loupe straps of the head strap to be placed within the 15 connector block, and then the connector block fastened. Preferably the two connectable parts of the connector block comprise corresponding pegs and holes to facilitate connection. Preferably, the head strap further comprises stopper ends configured to anchor the loupe straps in the connector block. This can provide a secure and reversible connection of the loupe straps of the head strap. The magnets and connector block can also be removed for cleaning of the head strap if so desired. 20 The loupe may be fitted to the face of the user. The magnification lenses may provide vision correction tailored to the user. For example, they may be supplied with prescription lenses. In a preferred implementation, the loupe straps of the head strap have a smooth outer surface. Even more preferably the flexible material is wipe-clean. In a preferred implementation, the flexible material may be silicone. These features assist in making the head strap easy to clean. 25 Also disclosed is a head strap for medical loupe glasses, comprising two tubes of flexible wipe-clean material and a magnet located on each tube, the magnets being connectable by magnetic forces to effect securement. This can provide a head strap which can be easily attached and detached, and which is hygienic as it can be easily cleaned. 06 09 24 One or more magnets may be located on each tube. The magnets may be located internally or externally on each tube. In a preferred implementation, the head strap has a smooth outer surface. Preferably, the flexible wipeclean material is silicone. This can allow the strap to be cleaned easily. 5 In a preferable implementation, the magnets are moveable. This can allow the size of the strap to be adjusted. Preferably, the magnets have flat faces. More preferably, the magnets have disc-shaped faces. The magnets may be located external to the head strap. In a preferable implementation, the magnets are located on toggles slidable over (the loupe straps or tubes of) the head strap. This can allow the 10 magnets to be moved easily, and as such the size of the head strap to be adjusted easily. Preferably, the magnets are located on an external face of the toggles, that face being parallel to the tube. The toggles may be generally cylindrical, and the magnets located on the ends. This can help to prevent hair or clothing becoming tangled. The toggles may be configured such that the faces of the magnets are parallel to the tubes. This facilitates connection of the magnets parallel to the (the loupe straps or tubes 15 of) head strap. The toggles may comprise a hole configured to accommodate the tube, and a dimension of the toggle parallel to the tube is reduced in the region of the hole. This can allow the head strap to bend around the toggle. Preferably, the two tubes have an internal diameter of 4 mm. In an alternative arrangement, the two tubes have an internal diameter, and the disc-shaped magnets 20 may sit within the tubing and have a diameter, wherein the diameter of the disc-shaped magnets is twice the internal diameter. More preferably, the disc-shaped magnets have a width, and the width of the disc-shaped magnets is 125% of the internal diameter. The internal diameter of the two tubes may be 4 mm, and the diameter of the disc-shaped magnets is 8 mm. More preferably, the width is 5 mm. Preferably, the head strap further comprises a connector block for connecting the two tubes. The 25 connector block may be detachable and replaceable. The connector block is preferably weighted. Even more preferably, the weight of the connector block is adjustable. This can provide a counterbalance for loupes secured by the head strap. 06 09 24 The connector block may comprise two connectable parts. Preferably the parts are removably connectable. This means the parts can be connected and disconnected, and then reconnected and disconnected and so on. This can allow the connector block to be disassembled and detached from the head strap. Preferably, the two parts comprise corresponding pegs and holes to facilitate connection. 5 The head strap may further comprise a stopper on the end of each tube, configured to anchor the tube in the connector block. Preferably the stoppers have flared ends. The stopper can be placed within the connector block, which is then assembled to connect the tubes of the head strap together. This process can be reversed to disconnect the tubes of the head strap. The head strap arrangement may be disassembled for cleaning. The stoppers, connector block and magnets may be removed for cleaning of 10 the tubes and / or each of the components. Preferably, the connector block comprises cavities configured to accommodate and anchor the stoppers. The cavities may be configured to accommodate the flared ends. Preferably, the toggles, connector block and stoppers can be disconnected from the tubes and subsequently reconnected. This can allow them to be disassembled for cleaning, then reassembled, 15 disassembled and reassembled and so on. Preferably, the tubes are configured to attach to temple arms of loupes, and comprise a textured internal surface to engage with temple arms of loupes. Preferably, the textured internal surface comprises raised surface elements, and the flexible material stretches between the raised surface elements to accommodate temple arms. 20 Also disclosed is a loupe apparatus comprising: loupe magnification lenses; temple arms having curved and broadening ends; a head strap attachable to the temple arms, the head strap being formed of a flexible wipe-clean material and having a textured internal surface; wherein the curved and broadening ends of the temple arms engage with the head strap such that the flexible wipe-clean material stretches to accommodate and secure the temple arms, and the textured internal surface grips the temple arms. 25 According to the present disclosure, there is disclosed a loupe apparatus comprising: loupes of a first weight; loupe straps connected to the loupes; and a connector block of a second weight connecting the loupe straps; wherein the first weight and the second weight are selected to counterbalance one another. 06 09 24 In a preferable implementation, the loupe straps may comprise magnets for securement, preferably reversible securement. Preferably the loupes comprise loupe magnification lenses and a nose bridge connecting the loupe magnification lenses, wherein preferably the nose bridge is configured to balance on a wearer's nose. The apparatus may further comprise temple arms to which the loupe straps are 5 attachable. Preferably, the temple arms are configured to balance on a wearer's ears. Preferably the first and the second weight are selected such that the loupe system remains stable on the wearer's nose and ears. Also disclosed is a head strap for medical loupe glasses, comprising two tubes of flexible wipe-clean material and a magnet located on each tube, the magnets being connectable by magnetic forces to 10 effect securement. This provides a secure and hygienic head strap for medical loupe glasses. In a preferable implementation, the head strap has a smooth outer surface, preferably wherein the flexible wipe-clean material is silicone. Preferably, the magnets are moveable. The magnets may be located on toggles slidable over the tubes. 15 The head strap may further comprise a connector block for connecting the two tubes, preferably wherein the weight of the connector block is adjustable. The connector block can act as a counterbalance, and by choosing different weights of connector block, different loupe arrangements can be balanced. Preferably, the connector block comprises two connectable parts, preferably wherein the two parts are 20 removably connectable. This can allow the block to be disconnected and removed, reconnected and disconnected, and so on. The two parts comprise corresponding pegs and holes to facilitate connection. Preferably, the head strap further comprises a stopper on the end of each tube, configured to anchor the tubes in the connector block. 25 In a preferred implementation, the toggles, connector block and stoppers can be disconnected from the tubes and subsequently reconnected. They can then be disconnected and reconnected again and so on. This can allow the elements to be cleaned separately between uses, and for elements to be replaced. 06 09 24 Preferably, the stoppers have flared ends. More preferably, the connector block comprises cavities configured to accommodate and anchor the flared ends of the stoppers. The magnets may have flat faces, preferably the magnets have disc-shaped faces. More preferably, the magnets are located on an external face of the toggles, that face being parallel to the tube. 5 In a preferable implementation, the toggles comprise a hole configured to accommodate the tube, and a dimension of the toggle parallel to the tube is reduced in the region of the hole. This can allow the tubes to bend relative to the toggle as they pass through the toggle, which can be more comfortable for the wearer. Preferably, the toggles have a generally cylindrical shape. More preferably, the magnets are located at an end of the cylindrical toggles. 10 Preferably, the tubes are configured to attach to temple arms of loupes and comprise a textured internal surface to engage with temple arms of loupes. Also disclosed is a loupe system comprising: loupes; and a head strap, comprising two tubes of flexible wipe-clean material and a magnet located on each tube, the magnets being connectable by magnetic forces to effect securement. 15 Preferably, the magnets are located on toggles slidable over the tubes. The loupes may comprise temple arms having curved and broadening ends, and the head strap may further comprise a textured internal surface configured to engage the temple arms. Preferably, the loupes comprise one or more magnification lenses, and the head strap further comprises a connector block, wherein the weight of the connector block is configured to counterbalance the one 20 or more magnification lenses. In some implementations, the loupes may comprise one or more magnification lenses and a head light, and the head strap may further comprise a connector block, wherein the weight of the connector block is configured to counterbalance the combined weight of the one or more magnification lenses and the head light. 25 Also disclosed is a head strap for medical loupe glasses, comprising: a pair of tubes of flexible material joined together at one end of each tube; and magnets physically attached to each tube at points along its length, wherein said tubes are attachable to temples of a pair of eyeglasses and said magnets are joined together by magnetic attraction. 06 09 24 Preferably the flexible material is silicone, rubber, polyvinyl chloride, polyurethane, nylon, cotton, braided fiberglass, or fluoropolymer. The tubes may preferably be connected by a weighted block selected from a plurality of blocks having different weights. 5 Preferably, the tube has a rough inner surface. Also disclosed is a head strap for medical loupe glasses, comprising: a pair of tubes of flexible material joined together at one end of each tube; and magnets inserted in each tube wherein the magnets are free to move within the tubes, wherein said tubes are attachable to temples of a pair of eyeglasses and said magnets are joined together by magnetic attraction. 10 The flexible material may preferably be silicone, rubber, polyvinyl chloride, polyurethane, nylon, cotton, braided fiberglass, or fluoropolymer. Preferably, the tubes are connected by a weighted block, the block selected from a plurality of blocks having different weights. The tube may have a rough inner surface. 15 The present invention may enable a dentist or surgeon to quickly and securely attach a set of loupes to their head whilst ensuring that the loupe head strap is hygienic and very easy to clean, is easy to adjust its size to ensure a tight fit whilst also being easy and quick to attach and detach. The method may also ensure that one size of head strap is able to fit many different manufacturers loupes using a safe and hygienic method of attaching them to the loupes. 20 In some embodiments the dentist or surgeon may attach a head strap made from pieces of silicone tube (forming loupe straps) to the loupes by simply sliding the ends of the two hanging ends over the ends of the loupe temples. The size, and the texture of the inside surface of the silicone ensures a tight fit on most standard loupes whilst the smooth outer surface ensures a highly hygienic surface which is easy to disinfect with wipes. The size of the head strap is adjusted by sliding cylindrical magnets located inside 25 the silicone tubes up, or down. Once the loupes are placed on the head, a simple hand movement to touch the two magnets together secures the head strap to the lower back of the head and ensures that the loupes are steady, as well as transferring the weight of the loupes away from the nose bridge to the back of the head. The weight of the connector at the end of the head strap behind the head can be 06 09 24 adjusted to balance the weight of the loupes front to back. In this embodiment the head strap is easily disinfected, is lightweight, is easily adjusted, fits most manufactured loupes and is simple and quick to attach and detach from the head. The present invention attaches to the loupes with a simple hand motion and may also allow simple 5 adjustment of the size of the head strap while ensuring that the whole assembly is hygienic and easy to disinfect, and may be securely attached to most of the manufactured loupe glasses available today. Many features and advantages of the present invention will become apparent from reading the following description, when considered in conjunction with the accompanying drawings. Also disclosed are a kit of parts for constructing any of the apparatuses or apparatus elements herein 10 described. Any apparatus feature as described herein may also be provided as a method feature, and vice versa. As used herein, means plus function features may be expressed alternatively in terms of their corresponding structure, such as a suitably programmed processor and associated memory, for example. 15 Any feature in one aspect of the invention may be applied to other aspects of the invention, in any appropriate combination. In particular, method aspects may be applied to apparatus aspects, and vice versa. Furthermore, any, some and / or all features in one aspect can be applied to any, some and / or all features in any other aspect, in any appropriate combination. It should also be appreciated that particular combinations of the various features described and defined in any aspects of the invention 20 can be implemented and / or supplied and / or used independently. It should also be appreciated that particular combinations of the various features described and defined in any aspects of the invention can be implemented and / or supplied and / or used independently. In this specification the word 'or' can be interpreted in the exclusive or inclusive sense unless stated otherwise. Brief Description of the Figures 06 09 24 One or more aspects will now be described, by way of example only and with reference to the accompanying drawings having like-reference numerals, in which: Figure 1 is a side elevation view of a person wearing a pair of loupes with a head strap, in accordance 5 with a first embodiment of the present invention; Figure 2 is a perspective view of a person wearing a pair of loupes with a head strap in accordance with the first embodiment of the present invention; Figure 3 is a perspective view of a head strap of the first embodiment with the magnets not connected; Figure 4 is a perspective view of a head strap of the first embodiment with the magnets connected; 10    Figure 5 is a perspective view of the end of the silicone tube of the head strap that is pushed over the temples of the loupes; Figure 6 is a side view of a head strap according to a second embodiment of the present invention with the magnets not connected; Figure 7 is a side view of a head strap according to the second embodiment with the magnets 15 connected; Figure 8a is an exploded perspective view of the magnetic toggle of the second embodiment; Figure 8b is an end view of the magnetic toggle; Figure 8c is a top view of the magnetic toggle; Figure 8d is a cross-sectional side view of the magnetic toggle through the line A-A as shown in Figure 20   8b; Figure 8e is a through-view of the magnetic toggle; Figure 9 is an expanded view of the end of the head strap and the connector block, including a magnified view in the vicinity of connector block; Figure 10 is a perspective view of a disconnected connector block within which stoppers are located; Figure 11a is a side view of the outer side of one half of the connector block; 06 09 24 Figure lib is a perspective view of one half of the connector block; Figure 11c is a side view of the inner side of one half of the connector block; Figure lid is a top view of one half of the connector block; and 5 Figure lie is an end view of one half of the connector block. Detailed Description In the preferred embodiment the dentist or surgeon disinfects their head strap by wiping with a disinfect wipe. The user then attaches the head strap to a pair of loupes which the dentist of surgeon owns, purchased from one of the many manufacturers selling such items. The user then adjusts the 10 fitting of the head strap by moving the magnets inside the head strap silicone tubes. Once adjusted the user places the loupes on the head, with the loupes resting on the bridge of the nose and the loupe temples resting over the ears of the user. The head strap is passed over the head and using a simple hand motion the head strap is tightened by pushing the magnets together. The user is then free, with two hands, to continue with his work. 15 Reference is made to Figure 1 which shows a side elevation view of a person wearing a pair of loupes 12 with a head strap 20, Figure 2 which shows a perspective view of the same person wearing the pair of loupes 12 and head strap 20, Figure 3 and Figure 4, which show perspective views of the head strap 20 on its own and Figure 5 which shows a perspective view of the end of the silicone tube of the head strap 20 which is attached to the temples of the loupes 12. 20 In step 1, the dentist or surgeon disinfects the head strap 20 by wiping the outer smooth silicone surface of the loupe straps 30 and 32 and aluminum connector block 38 with a readily available disinfectant wipe, or by boiling the head strap 20 in water for 3 to 4 minutes. The head strap 20 is easy to clean because the uniform construction of the head strap 20 means there are no sharp edges to catch either the wipe or other foreign objects such as hair and also because the loupe straps 30 and 32 are made 25 from silicone material. Silicone is quick-drying, non-porous and hypoallergenic and is 35 times more hygienic than nylon and therefore the head strap 20 is highly more hygienic than a pair of nylon or cotton retainers. 06 09 24 In step 2, if this is the first time that the user is wearing the head strap 20 they will adjust the size of the head strap by moving the Neodymium N52 magnets 34 and 36 located inside the silicone tubes, which form the loupe straps 30 and 32, up or down by a gentle squeeze to ensure the distance between the ends 26 and 28 of the head strap 20 and the magnets 36 and 38 is approximately the distance between 5 the ears 22 and 24 and the back of the head. The disc shaped magnets 36 and 38 have been designed with dimensions of 8 mm diameter and 5 mm width, which sit inside the silicon tubing of the loupe straps 30 and 32, which has an internal diameter of 4 mm. This combination of sizes has been found to be optimal to allow the magnets to move without slipping. The magnets 34 and 36 have flat faces to ensure there are no 'pinch points' which can wear 10 excessively when the magnets are constantly connected and reconnected. In step 3, the user attaches the ends of the head strap 26 and 28 to the loupes 12 by inserting the ends of the temples 18 into the ends 26 and 28 of the head strap 20 using a push and twisting motion until tight. The inside of the ends 26 and 28 of the silicone tubing of the loupe straps 30 and 32 of the head strap 20 have been designed with a textured internal surface 40 so that the silicone both grips more to 15 the surface of the temples arms using the raised surface elements and also at the same time allows for the silicone material to stretch between the raised surface elements to accommodate as many different sizes and styles of loupe temple arms as possible. Once the head strap 20 is attached to the loupes 12, in step 4, the user guides the temples of the loupes 18 either side of the head 10 and over the ears 22 and 24 and the nose bridge of the loupes 14 sit on the 20 user's nose. Whilst guiding the loupes 12 the user ensures that the head strap 20 is placed over the head 10. In step 5, once the loupes 12 are comfortable on the ears 22 and 24 and nose 14, the user grasps the magnets 34 and 36 and pushes them together behind the head until the magnets 34 and 36 come together due to their magnetic attraction. If the head strap 20 is found to be too loose or tight on their 25 first use, the user can pull the magnets 34 and 36 apart and slide them up or down further inside the silicone tube of the loupe straps 30 and 32 as required to readjust the size and then 'click' them together again. During the dental or surgical procedure, the user can view in detail the area to be examined using the loupe magnification lenses 16. If the user needs to move their head from side to side, or up and down, 30 the head strap 20 ensures that the loupes 12 remain stable on the nose and ears 22 and 24 and do not 06 09 24 slip so much that the view down the magnification lenses 16 is not straight or distorted, or that the loupes 12 do not fall due to their weight and unbalanced nature and potentially break. In an alternative embodiment, where heavier or larger loupes 12 are required, the aluminum connector block 38 can be replaced with an alternative heavier weighted block to counterbalance the weight of the 5 loupes on the nose, and over the ears 22 and 24 to ensure a more stable sitting of the loupes 12 on the head 10. Once the user has completed their dental or surgical procedure, the user can pull the magnets 34 and 36 apart to loosen the loupes, and the loupes can be taken off the face in a forward motion, with the head strap 20 passing over the head 10. 10 In the first embodiment, as illustrated in Figures 1 to 4, the magnets 34 and 36 are located inside the flexible tubing of the loupe straps 30 and 32. Figures 6 to 9 illustrate a further embodiment in which a toggle arrangement is used, such that the magnets are positioned on the outer surface of the tubing of the loupe straps 130 and 132. Figure 6 shows the head strap 120 of this second embodiment in an unconnected position. A magnetic toggle 134 and 136 sits over each of the flexible tubes of the loupe 15 straps 130 and 132, and these tubes are connected by the connector block 138. Figure 7 shows this same arrangement in a connected position. The head strap 120 can be positioned over the user's head and connected using the same motions as previously described. Figure 8a shows an exploded view of the magnetic toggle 134, which consists of a generally cylindrical body 140 having a hole 142 through which the tubes of the loupe straps 130 and 132 can pass. The 20 toggle 134 further consists of a magnet 144, which can be attached to the body 140 via a screw 146. The magnet 144 is generally disc-shaped and sits at one end of the cylindrically shaped toggle 134. The hole 142 passes through the longitudinal sides of the toggle 134, such that the tubes of the loupe straps 130 and 132 can pass parallel to the flat face of the disc-shaped magnet 144. Figure 8b shows an end view of the toggle 134, where the body 140 has a gently curved end, and Figure 25 8c shows a side view of the toggle 134 including the hole 142. Figure 8d shows a cross-sectional view along the line A-A as indicated in Figure 8b. A screw 146 passes through the centre of the face of the disc of the magnet 144 through to the body 140 of the toggle 134, and thereby retains the magnet in place. In the vicinity of the hole 142, the diameter of the cylindrically shaped toggle 134 is reduced; this can facilitate bending of the tube as it passes through the hole 142. The flat face of the magnet 144 in the 30 toggle 134 will face the flat face of a magnet in the other toggle 136, and the toggles 134 and 136 can 06 09 24 thus be connected by the magnetic forces between them, as illustrated in Figure 7. The configuration of connection between two flat end faces of a generally cylindrical toggle minimizes the number of potential pinch points, which helps to prevent hair or clothing becoming caught or tangled. The toggles 134 and 136 can be disconnected easily by pulling the magnets apart. The toggles 134 and 136 can be 5 easily moved along the tubes of the loupe straps 130 and 132 passing through the holes 142, by which movement the size of the head strap 120 can be adjusted to fit the user. Figure 9 provides an exploded view of the ends of the tubes of the loupe straps 130 and 132, the toggles 134 and 136, stoppers 140, and the connector block 138. Figure 10 shows an arrangement where the stoppers are positioned within the connector block 138. The toggles 134 and 136 can be threaded onto 10 the tubes of the loupe straps 130 and 132. The stoppers 140 can be fitted to the ends of the tubes of the loupe straps 130 and 132, preferably by inserting the neck 142 of each stopper 140 within the end of each of the tubes of the loupe straps 130 and 132. The tubes stretch and grip the stopper necks 142 to hold the stoppers 140 in place. This end of the tubes of the loupe straps 130 and 132 may also be textured to facilitate this. The stoppers have flared ends 144, which extend out to a diameter wider than 15 the diameter of the tubes of the loupe straps 130 and 132. As can be seen in Figure 10, the flared ends 144 of the stoppers 140 engage with correspondingly shaped cavities 148 within the connector block 138. The neck of the cavities 148 of the connector block 138 have a diameter larger than the outer diameter of the tubes of the loupe straps 130 and 132, but smaller than the outer diameter of the flared ends 144 of the stoppers 140. When the stoppers 140 are attached to the ends of the tubes of the loupe 20 straps 130 and 132, the ends of the tubes and stoppers 140 can be placed within one half of the connector block 138. Once the two halves of the connector block 138 are joined, the flared ends 144 are clamped by the two halves to anchor the stoppers 140 within the connector block 138, thereby connecting the ends of the tubes of the loupe straps 130 and 132. Figures 11a to lie show different views of one half of the connector block 138. In particular, Figure 11c 25 shows that there is a flared post 146 between the two cavities 148 that accommodate the flared ends 144 of the stoppers 140. The flared post 146 is arranged to flare in an opposite orientation to the flared ends 144 of the stoppers, such that they can fit together to engage and keep the stoppers 140 in place. The connector 138 comprises a plurality of holes 150 and pegs 152, which are configured to engage with one another to reversibly join the two halves of the connector block 138. The two halves are held 30 together by the frictional connection between the holes 150 and pegs 152, which ensures the connector block 138 remains connected during normal use. The two halves can be detached by pulling them apart from one another. Preferably, each half comprises a combination of holes 150 and pegs 152, as this can improve the security of the connection. The connector block 138 as described could be use in conjunction with magnet provided internally or externally to the head strap 120. If used with the second embodiment, in which the magnets are located 5 on toggles slidable over the tubes, it is possible for the connector block 138 to be disconnected and removed, and the stoppers 140 and toggles 134 and 136 removed also. This can allow the loupe straps 130, 132 to be removed completely and thoroughly cleaned and / or replaced. It should be understood that the present invention has been described above purely by way of example, and modifications of detail can be made within the scope of the invention. 10 Each feature disclosed in the description, and (where appropriate) the claims and drawings may be provided independently or in any appropriate combination. Reference numerals appearing in the claims are by way of illustration only and shall have no limiting effect on the scope of the claims. 06 09 24

Claims

04 10 241. A loupe system comprising:loupe glasses of a first weight comprising:loupe magnification lenses;5                       a nose bridge connecting the loupe magnification lenses; andtemple arms; anda head strap comprising:loupe straps connected to the temple arms of the loupe glasses, the loupe straps being formed of flexible wipe-clean material;10                       at least two magnets connectable by magnetic forces to effect reversible securement,wherein at least one magnet is located on each loupe strap; anda connector block of a second weight connecting the loupe straps;wherein the nose bridge is configured to balance on a wearer's nose, the temple arms are configured to balance on a wearer's ears, and the first weight and the second weight are 15               selected to counterbalance one another.

2. The loupe system of claim 1, wherein the loupe glasses further comprise a headlight and the first weight comprises the combined weight of the loupe magnification lenses and the headlight.

3. The loupe system of any preceding claim, wherein the loupe straps have a smooth outer 20                surface.

4. The loupe system of any preceding claim, wherein the flexible wipe-clean material is silicone.

5. The loupe system of any preceding claim, wherein the magnets are moveable.

6. The loupe system of any preceding claim, wherein the magnets have flat faces.

7. The loupe system of claim 6, wherein the magnets have disc-shaped faces.25           8. The loupe system of any preceding claim wherein the magnets are located on toggles slidableover the loupe straps.

9. The loupe system of claim 8 when dependent on claim 6, wherein the toggles are configured such that the faces of the magnets are parallel to the loupe straps.

10. The loupe system of claim 8 or 9, when dependent on claim 6, wherein the toggles are slidable over the loupe straps in a direction parallel to the flat faces of the magnets.

11. The loupe system of any of claims 8 to 10, wherein the magnets are connected to the toggles via a screw.

12. The loupe system of claim 11, when dependent on claim 7, wherein the screw passes throughthe centre of the disc-shaped faces of the magnets.

13. The loupe system of any preceding claim, wherein the weight of the connector block is adjustable.

14. The loupe system of any preceding claim, wherein the connector block comprises twoconnectable parts.04 10 2415. The loupe system of claim 14, wherein the connectable parts of the connector block are removably connectable.

16. The loupe system of claim 14 or 15, wherein the connectable parts of the connector block comprise corresponding pegs and holes to facilitate connection.

17. The loupe system of any of claims 14 to 16, further comprising a stopper on the end of at leastone loupe strap, configured to anchor the loupe strap in the connector block.

18. The loupe system of claim 17, wherein the at least one stopper has a flared end.

19. The loupe system of claim 17 or 18, wherein the connector block comprises cavities configured to accommodate and anchor the at least one stopper.

20. The loupe system of any of claims 17 to 19, wherein the toggles, connector block and at leastone stopper can be disconnected from the loupe straps and subsequently reconnected.

21. The loupe system of any preceding claim, wherein the loupe straps comprise a textured internal surface to engage with the temple arms of the loupe glasses.

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