Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
  • A61H3/00—Appliances for aiding patients or disabled persons to walk about
  • A61H3/02—Crutches
  • A61H3/0277—Shock absorbers therefor
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
  • A61H3/00—Appliances for aiding patients or disabled persons to walk about
  • A61H3/02—Crutches
  • A61H3/0277—Shock absorbers therefor
  • A61H2003/0283—Shock absorbers therefor using elastomeric material
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
  • A61H3/00—Appliances for aiding patients or disabled persons to walk about
  • A61H3/02—Crutches

Definitions

• the present invention relates to mobility aid apparatuses and methods.
• embodiments of the present invention are especially applicable to crutches or the like.
• Mobility aids including crutches of various designs have long been used to assist people with injuries or other temporary or permanent disabilities.
• typical commercially available crutches are adjustable in overall height and in the position of a handle along the overall height.
• a typical commercially produced crutch has body components made of wood (see, e.g., U.S. Patent No. 815,368) or aluminum (see, e.g., U.S. Patent No. 4,838,291).
• Such body components typically have multiple holes by which they can connect to one another using metal bolts and metal wing nuts.
• overall height and handle position is determined.
• FIG. 1A includes a schematic diagram of an embodiment of the invention
• FIG. IB includes an outline diagram of a crutch that embodies the invention
• FIGS. 2 A, 2B, and 2C include views of an upper component of the crutch
• FIGS. 3 A, 3B, and 3C include views of a middle component of the crutch
• FIG. 3D includes an enlarged, fragmentary view of a portion, of the middle component, that includes the handle of the middle component;
• FIGS. 4A-4C include views of the handle;
• FIGS. 5A-5C include views of an adjustment pin for the handle;
• FIGS. 6A-6C include views of a lower component of the crutch as assembled to the lower portion of the middle component;
• FIGS. 7 A and 7B include fragmentary views of only an upper region of the lower component of the crutch
• FIGS. 8A-8C include views of a lower portion of the lower component of the crutch, including a breakout view of the bottom of the lower portion;
• FIG. 9 includes a perspective view of a step cap, seen in, e.g., FIGS. 7B and 8A-8C, from the lower portion of the lower component;
• FIGS. 10 A- 10C include views of a boot, or footpad, that was seen in FIGS. 6A-6C;
• FIGS. 11 A- 11 D include views of an example adjustment pin according to an alternative embodiment of the invention;
• FIGS. 12A-12C include views of another example adjustment pin according to an alternative embodiment of the invention.
• FIG. 13 includes an exploded view of an alternative embodiment of the invention that has a simplified single-post design
• FIGS. 14A-C and 15A-B include views of two parts of a particular, two-part implementation of a main body component
• FIGS. 16A-C include views of a forearm crutch according to an embodiment of the present invention.
• FIGS. 17A-C include views of a cuff of the forearm crutch of FIGS 16A-C.
• FIGS. 18A-E include views of an upper post 17c of the forearm crutch of FIGS 16A-C.
• FIG. 19 includes a schematic diagram of the main body component and mold cores being withdrawn from the molded main body component in directions indicated by arrows.
• Embodiments of the present invention are (also) discussed in the following commonly-owned U.S. Patent Applications, which are hereby incorporated by reference in their entirety for all purposes:
• FIG. 1A includes a schematic diagram, in elevation view, of an embodiment of the invention.
• a crutch la includes an upper component 3a, a middle component 5a, a lower component 7a, and a handle 9a that are adjustably interconnected.
• Three vertical adjustments relative to the middle component allow the crutch to accommodate a large range of user heights and arm lengths.
• the three adjustments are of the upper component 3a, the handle 9a, and the lower component, respectively.
• the large range is of advantage to manufacturers, hospitals, and distributors, which otherwise would need to produce, buy, and/or stock several sizes of conventional crutches (typically medium adult, tall adult, child, and small child).
• the embodiment of the invention replaces several sizes of crutches with a single model.
• the embodiment of the invention can be composed mostly or entirely of polymeric material, for example, high strength plastic such as xenoy, nylon, polypropolene, peat, or the like.
• the plastic can be plastic filled with glass, wood, other strengthening additives, or the like.
• parts that move relative to each other during crutch use can be lubricated externally or with an additive, for example, silicone, or the like.
• glass filled nylon having about 30% glass content produces good strength and low weight and costs of the crutch.
• the composition of the crutch including for example, proportion of glass content, may be changed to accommodate changes in material costs, crutch design, manufacturing procedures, customer preferences, other market forces, or the like.
• FIG. IB includes an outline diagram, in front elevation view, of an embodiment of the invention, namely, a crutch 1 that embodies the crutch la of FIG. 1A.
• a crutch 1 that embodies the crutch la of FIG. 1A.
• the view shown in FIG. IB is called the "front view", for convenience. It will be appreciated that, when the crutch is held underarm for use by a person, the "front" face of the crutch as seen in FIG. IB will face a direction that is generally sideways of the person and not frontward of the person.
• the crutch 1 includes an upper component 3, a middle component 5, a lower component 7, and a handle 9.
• the just-mentioned components 3, 5, 7 will also be referred to as the underarm component 3, the main body component 5, and the shaft 7, respectively.
• elements corresponding to the underarm component 3 might not be intended to fit "underarm” (e.g., for forearm crutches), and elements corresponding to the shaft 7 might not take the form of a "shaft”, and elements corresponding to the main body component 5 might not be considered to be "main”.
• Components 3 and 5 have a junction 11.
• Components 5 and 9 have a junction 13.
• Components 5 and 7 have a junction 15.
• FIGS. 2A, 2B, and 2C include, respectively, a front elevation view, a side elevation view, and a front section view of an embodiment of the upper component 3 shown in FIG. IB.
• FIGS. 3A, 3B, and 3C include, respectively, a front elevation view, a side elevation view, and a front section view of an embodiment of the middle component shown in FIG. IB.
• the underarm component 3, as embodied, accommodates a padded underarm saddle pad 16 and includes at least one (two are shown) downwardly extending post 17.
• the main body component 5 includes a corresponding number of upwardly extending hollow posts 19 (two are shown) that are open at top to accept the downwardly extending posts in telescoping manner.
• Spring pins 21 are molded into the underarm component 3.
• the hollow posts 19 have sidewalls that have vertically spaced holes that are configured to receive the spring pins 21. Crutch height is easily adjusted by telescoping the downwardly extending posts 17 into the upwardly extending hollow posts 19 and inserting the spring pins 21 into selected ones of the vertically spaced holes 23 to lock the crutch height.
• the inclusion of spring pins 21 integrally in the underarm support for locking vertical adjustment simplifies the crutch design, as conventional crutches have traditionally used separate spring pins or separate bolts.
• the hollows of the hollow posts 19 can be other than perfectly cylindrical.
• Each of the hollows can be formed to have a taper, to facilitate withdrawal of a core mold from a molded hollow post 19.
• more taper means easier manufacturing.
• a core mold need not be as polished and "non-stick" if it is being withdrawn from a core having a slight, favoring taper.
• less taper, or no taper can give a more precise feel to the apparatus by reducing looseness.
• a taper of no more than about a 1/16 of a degree gives a good, precise feel.
• a taper of at least 1/16 of a degree gives greater ease and economy of manufacture, but preferably the taper is no greater than about 1/4 of a degree of taper, or, no greater than about 1/8 of a degree. In still another embodiment, a taper is greater than 1/8 of a degree, to give even greater ease of manufacture. Still other tapers are possible.
• the taper is a negative draft with regard to the telescoping downwardly pointing underarm support posts of the underarm component 1. Such a negative draft gives a tighter fit at the mouth of the hollow, and makes the looseness less noticeable to the user, as compared to a hollow with a wider mouth.
• the negative draft is formed by a core mold for each hollow.
• the mold core is preferably withdrawn from the main body component in a "downward" direction 25 with respect to the main body component, as shown in FIG. 19.
• each hollow has positive draft with respect to its mold core.
• spring supports 27 keep the underarm support 3 stable relative to the main body component 5, especially given the negative draft of the hollows of the hollow posts 19, for example, by springing outward to meet the internal sidewalls despite the tapering of the sidewall away from the diameter of the underarm support post 17.
• the hollow that accepts the support post 17 may have a corresponding channel or keyway 31 into which the spring support 27 fits and against which the spring support 27 would push to help resist any relative rotation between the support post 17 and the hollow that accepts the support post 17.
• the spring support 27 is an example of a protuberance that fits into a corresponding keyway to resist rotation. Any other way of resisting rotation between mating components can also or instead be used.
• the main body component 5 is preferably a one-piece, all polymeric design (e.g., integrally reinforced plastic) with ribbing 33 to reduce weight while having adequate desired flexural strength. Conventional Finite Element Analysis can be used to select dimensions of the ribbing. The ribbing 33 also protects the snaps 21 in the upper component 3 and similar snaps in the lower component (which will be seen in later drawings) from inadvertent detent. [0019] FIG.
• FIG. 3D includes an enlarged, fragmentary front elevation view of a portion, of the main body component of FIG. 3 A, that includes the handle 9 of the main body component 5.
• FIGS. 4A-4C respectively include a front elevation view, a top view, and a side elevation view of the handle 9.
• the handle 9 is preferably adjustable in its height position along the crutch 1.
• the handle 9 may be ribbed to give strength at an economical weight.
• the crutch 1 includes removable pins for adjustment and placement of a crutch grip into selected ones of vertically spaced support holes 35 (see FIG. 3D) in the main body component 5.
• FIGS. 5A-5C respectively include a perspective view, a side elevation view, and a rear elevation view of an embodiment 37 of an adjustment pin.
• the adjustment pin 37 has at least one prong 39 (two are shown and are preferred) and has a crescent-shaped backplate 41.
• the adjustment pin 37 is configured to snap into place.
• the backplate 41 has hooks 43 that snap into place to hold the adjustment pin 37 in place.
• the pin 37 in a preferred embodiment is molded of polymeric material, but any other suitable material, e.g., metal, may be used.
• FIGS. 6A-6C include respectively a front elevation view, a side elevation view, and a front section view of the shaft 7 as assembled to the lower portion of the main body component 5. Only the lower portion of the main body component 5 is shown.
• the shaft 7 preferably includes a boot 44 at bottom.
• the crutch 1 preferably includes a shock absorber.
• the shock absorber is part of the lower component 7.
• FIGS. 7A and 7B include respectively a front elevation view and a side section of only an upper region of the shaft 7.
• the shaft 7 includes an upper shaft portion 45, a lower shaft portion 47, and a shock absorber 49 between the portions 45 and 47.
• the shock absorber 49 acts as a spring with a spring rate (also known as spring constant) that increases with the amount of weight applied, resulting in a similar shock absorbing feel to the crutch for users of varying weights (note: a spring constant measures the strength of the spring, where a higher value denotes a stronger spring).
• the shock absorber 49 is configured to have a variable spring rate such that as F increases, K increases as well, allowing X to increase substantially less than proportionately with increases in F.
• the shock absorber 49 is made of a resilient material, for example, rubber, plastic, or the like, for example, neoprene, that has a cone-like shape.
• the shock absorber can also have any other shape having a section that increases in thickness from one end to the other.
• the shock absorber can also be any other type of variable-spring-rate spring, for example, a coil spring having variable coil diameter and/or variable coil density. Due to the nature of the shock absorber 49, the crutch provides similar shock absorbency to users of diverse weights with a single part. Furthermore, the use of a neoprene or other low durometer rubber or plastic with a good structural memory provides further improvement over other shock absorbing mechanisms.
• the lower shaft portion 47 can slide axially relative to the upper shaft portion
• the lower shaft portion 47 includes guide pins 51 that slide against guide slots 53 in the bottom edge of the lower sidewall of the upper shaft portion 45.
• the guide pins 51 and the slot 53 were preferably molded into the molded portions 45 and 47.
• the guide pins 51 and guide slots 53 resist relative rotation by the upper and lower shaft portions 45 and 47.
• the guide pins 51 also form a locking mechanism that prevents the upper and lower shaft portions 45 and 47 from unintentionally separating.
• the inner wall of the upper shaft portion 45 is dimensioned to closely fit around the upper outer wall of the lower shaft portion 47 in order to provide a tight engagement between the two components, while still allowing sliding movement between parts.
• the top of the lower shaft portion 47 includes a stepped cap 55 that has an upwardly facing concave indentation, which receives the shock absorber 49 and keeps the shock absorber centered.
• the main body component 4 includes a long downwardly pointing hollow post 57 that accepts the shaft 7.
• the upper shaft portion 45 includes spring pins 59 for vertical adjustment of the crutch height that is in addition to the crutch height adjustment using the underarm component 3.
• the sidewall of the downwardly pointing hollow post 57 of the main body component 5 includes spaced holes 61 that accept the spring pins 59.
• cavity of the main body component 4 that accepts the shaft can be other than perfectly cylindrical.
• the cavity can have a taper.
• the taper is a negative draft with regard to the telescoping upwardly pointing shaft.
• the negative draft is formed by a mold core for the cavity. Referring to FIG. 19, the mold core is preferably withdrawn from the main body component in an "upward" direction with respect to the main body component, as shown by an arrow 63.
• the cavity has positive draft with respect to the mold core.
• a taper of no more than about a 1/16 of a degree gives a good, precise feel.
• a taper of at least 1/16 of a degree gives greater ease and economy of manufacture, but preferably the taper is no greater than about 1/4 of a degree of taper, or, no greater than about 1/8 of a degree. In still another embodiment, a taper is greater than 1/8 of a degree, to give even greater ease of manufacture. Still other tapers are possible. [0029] Referring again to FIGS. 7A-7B, the shaft 7 is kept from rotating relative to the main body component 5 (see, e.g., FIG. 6A-6C) by supports 65, which, similarly to feature 27 from FIGS.
• the cavity that accepts the shaft 7 may have a corresponding channel or keyway 67 (see FIGS. 6C, 3C) into which the support 65 fits and against which the support 65 would push to help resist any rotation between the shaft and the cavity that receives the shaft.
• the support 65 and its corresponding keyway or channel 67 prevents or reduces any rotation-caused stress on pins 51 or 59 or both 51 and 59.
• the support 65 is an example of a protuberance that fits into a corresponding keyway to resist rotation. Any other way of resisting rotation between mating components can also or instead be used.
• the ways discussed in connection with feature 27 of FIGS. 2A-2C can be used.
• the upper region of the shaft 7 is designed to prevent complete removal of the entire shaft 7 from the bottom of the main body component 5.
• the internal keyway 67 in the main body component 5 terminates near the end of the bottom of the main body component 5 (see termination 69, FIG. 3C) such that the upper region of the shaft 7 cannot exit through the bottom of the main body component 5. In this way, tampering, loss of parts, and other damage is avoided.
• FIGS. 8A-8C include respectively, a top view, a side elevation view, and a side section view of the lower portion 47 of the shaft 7 of the crutch 1.
• the bottom of the lower portion 47 preferably terminates in a closed end 71 that caps (in the sense of closing off, preferably integrally during manufacture) the preferably hollow lower portion 47 of the shaft 7.
• the closed end 71 provides a larger surface (as opposed to a tubular open end) over which to distribute axial force on the boot 44 (see FIGS. 6A-6C). This prevents excessive wear on the boot 44 and helps to allow the entire boot 44 to be metal free, as traditional boots have used a metal washer embedded in the footpad to serve the function of reducing wear on the traditional boot.
• FIG. 9 includes a perspective view of a step cap, seen in, e.g., FIGS. 7B and
• FIGS. 10A-10C include respectively a side elevation view, a front section view, and a perspective view of the boot 44 (that was seen in FIGS. 6A-6C), which is also referred to as the footpad 44.
• the footpad 44 differs from its predecessors by being shaped to be "missing" one or more rings 73 of material from the exterior of the footpad 44. This results in an accordion-like function, providing extra cushioning for the crutch user. Additionally, the removed ring (or rings) allows the base of the footpad to remain flush with the ground even when weight is applied during use at large angles from the vertical.
• the material between the "missing" portions can also act to limit footpad flexibility to prevent buckling. This confers greater traction and stability during crutch use.
• the footpad can be constructed out of any rubber or other polymeric material, but preferably out of a skid-resistant material that does not wear quickly.
• an underarm crutch has height that can be adjusted by amounts within a range of about 15 inches. This compares very favorably with conventional crutches, which tend to have heights that are adjustable within a much smaller range.
• the range of adjustment of about 15 inches may, for example, include about 9 inches of adjustment at the interface between the lower and the middle components (with less than about 1/4 of a degree of taper in the receiving cavity) and about 6 inches of adjustment at the interface between the upper and the middle components (with less than about 1/8 of a degree of taper in the receiving hollows).
• the tapers can further be restricted to less than about 1/8 of a degree, and less than about 1/16 degree, respectively.
• the crutch may be configured such that the range of heights may be, for example, from about 45 inches to about 60 inches or from about 48 inches to about 62 inches. Other ranges may also be used. For example, a range of adjustment of more than about 9 inches, or more than about 12 inches is also useful. Still other ranges may be used. It is to be understood that the present invention need not be tied to any particular numeric range of adjustment. [0036]
• the integral spring pins 21 and their peninsular springs, as seen in FIGS. 2A-2B do not exist.
• FIGS. 11A-1 ID include respectively a front elevation view, a side elevation view, a top view, and a perspective view of an example adjustment pin 75. Crutch height is adjusted by telescoping the downwardly extending posts 17 (see, e.g., FIGS. 2A-2C) into the upwardly extending hollow posts 19 (see, e.g., FIGS.
• the adjustment pins 75 when removed allow for both of the crutch users' hands to be free to adjust the underarm component 1 to the appropriate height.
• This height adjustment mechanism does not require the crutch user to apply continuous pressure to depress any spring pins while adjusting the height.
• a similar adjustment pin (not shown) can be used in adjusting the shaft 7, by similarly replacing the spring pins 59, seen, e.g., in FIGS 7A-7B, according to the alternative embodiment or another embodiment.
• Separate adjustment pins may be, for example, separately molded from plastic, or the like.
• FIGS. 11 A-l ID are just one possible shape.
• Other shapes can also be used.
• a pin having a more substantially cylindrical, dowel shape insertion portion can be used to enhance strength both along the length of the pin and transversely.
• Such a shape would still have snap features that allows locking in the crutch to prevent inadvertent removal.
• a shape would still have a head.
• the head is still configured to fit within ribs.
• a rectangular shape having two edges that abut rib walls would orient the pin to ensure that the snap feature on the pin engages as designed.
• FIGS. 12A-12C include respectively a top view, a side elevation view, and a front elevation view of such another example adjustment pin 75b.
• the downwardly extending posts 17 and the upwardly extending hollow posts 19 in the alternative embodiment have holes that extend through all material.
• each pin 75 (or 75b) can penetrate in from one side of an upwardly extending hollow post 19 and have a distal end of the pin 75 poke out from the opposite side of the upwardly extending hollow post 19.
• the configuration of pins 75 includes a head 77 and a protrusion 79 and an optional depression 81.
• the protrusion is compressible to allow entry through the vertically spaced holes of the crutch.
• the protrusion prevents the pin from being removed from the crutch without firm and concentrated force.
• a crutch user would apply a force on an end 83 distal from the head to push the pin 75 out slightly to better expose the head 77.
• the crutch user can then remove the pin 75 by gripping and pulling the head 77.
• the head When the pin 75 is secured in the crutch the head preferably rests between ribs 33 (that are seen, e.g., in FIG. 3A) of the main body component 5.
• FIGS. 14A-C and 15A-B depict views of two parts of a particular, two-part implementation of a main body component. Instead of being integrally molded, the main body component comprises an upper part (FIGS. 14A-C) and a lower part (FIGS. 15A-B, not to same scale as FIGS. 14A-C), which are separately made and then assembled. Having separate parts serves to reduce the size of the mold needed for the main body component, and makes it easier to core the parts in the right direction (such that with taper, the openings in the crutch body fit tightly with sliding parts).
• the upper and lower parts of the main body component can be joined, after molding, with a "snap fit," threading (like a screw), or press fit.
• An adhesive for example, epoxy-based or the like
• the two-part main body component can allow a crutch user to separate the crutch into two segments on demand for ease of storage and transportation. This same feature can also reduce the space required for shipping and storage of the crutch by distributors and healthcare facilities.
• a removable pin for example, a pin similar to the pin 75b of FIGS.12A-C, may be used to secure the two halves when assembled.
• FIGS. 16 A-B include a front elevation view and a side perspective view of a forearm crutch lc according to an embodiment of the present invention.
• the 16C includes a top view of the forearm crutch lc, which is preferably made using polymeric materials as a structural basis and to contain substantially no metal.
• the forearm crutch lc includes a lower leg 89, a grip handle 9c, a forearm post 19c, and a cuff 91.
• the cuff 91 is connected to the rest of the forearm crutch 1 c via an upper post 17c.
• the lower leg 89 is adjustable in height, as has been discussed above, for example, in connection with the crutch 1 of FIG. IB.
• the height position of the cuff 91, relative to the handle 9c, is also adjustable via telescoping of the upper post 17c into a hollow core of the forearm post 19c. Height position of the handle 9c is either fixed, in one embodiment, or is separately adjustable, in another embodiment. The user would contact the forearm crutch lc at the handle 9c and the cuff 91 during use.
• the handle 9c of the forearm crutch lc is preferably supported at both ends, as opposed to being fixed at only one end as on traditional models. Further, the lower leg 89 is positioned such that its vertical axis, if extended imaginarily, would intersect the handle 9c at a point within the grip of a user's gripping hand, for example, near the center of the handle 9c, and/or not at one end of the handle 9c.
• the shown design spreads pressure throughout the palm of the hand, whereas previous designs concentrated the stress between the thumb and forefinger. The reduction in stress concentration could reduce incidence and severity of Carpal Tunnel Syndrome and other repetitive stress injuries caused by crutch use.
• the forearm crutch lc is shown as being configured to use a detachable upper pin 75c, but an integral spring pin, or other locking mechanisms, may also be used.
• the detachable pin 75c may, for example, resemble the detachable pin 75b shown in FIGS. 12A-C.
• the forearm crutch lc is shown as using a modular, detachable, height-adjustable lower leg 89.
• a modular, detachable, height-adjustable lower leg 89 can be a common interchangeable part that is also used within an underarm crutch. (See FIGS. 14A-C and 15 A-B.)
• detaching the lower leg 89 enables more compact storage and transport.
• the forearm crutch lc is preferably configured to consolidate the three traditional forearm crutch models (junior, adult, and tall adult) into two models. Traditional heights from handle to tip for each model are as follows: Junior - 24.5" to 33.5" Adult - 28" to 37" Tall Adult- 35.5" to 41.5.”
• the forearm crutch lc in contrast, can be embodied in two sizes to cover the same height range. For example, a medium model can be adjustable between about 24.5 inches to about 32 inches, and a tall model can be adjustable between about 32 inches to about 42 inches. Still other ranges may be used. It is to be understood that the present invention need not be tied to any particular numeric range of adjustment.
• the configuration of the forearm crutch lc for greater adjustability can simplify inventory for healthcare providers and distributors by eliminating the need for a third product and product code.
• FIGS. 17A-C include a top view, a front view, and a side view, respectively, of the cuff 91.
• FIGS. 18 A-E include a front elevation view, a side elevation view, a rear section view, a front section view, and a top view, respectively, of the upper post 17c into which the cuff snaps.
• the cuff 91 can easily be manually snapped on and off a post 17c.
• the cuff 91 can also be pivoted on the post 17c.
• conventional cuffs are bolted, riveted or non-removable.
• the snap-action detachable connection between the cuff 91 and the rest of the forearm crutch lc allows for easily interchangeable cuffs.
• Any snapping and pivoting mechanism can be used to connect the cuff 91 and the upper post 17c.
• the particular mechanism illustrated includes a pivot bar on the cuff 91, and a snap-action receiver on the upper post 17c that receives the pivot bar.

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• 2003
  • 2003-08-06 AU AU2003264024A patent/AU2003264024A1/en not_active Abandoned
  • 2003-08-06 WO PCT/US2003/024923 patent/WO2004012641A2/en not_active Application Discontinuation
  • 2003-08-06 EP EP03767280A patent/EP1575474A4/de not_active Withdrawn

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