while this invention is susceptible of embodiment in many different forms , there is shown in the drawings , and will herein be described in detail , exemplary embodiments , with the understanding that the present disclosure is to be considered as illustrative of the principles of the invention and not intended to limit the invention to the exemplary embodiments shown and described . a tank assembly 10 constructed in accordance with the principles of the present invention is shown in fig1 . the tank assembly 10 includes a tank 12 containing a therapeutic fluid , such as oxygen . although the tank 12 is illustrated as a type “ b ” tank , the principles of the present invention are equally applicable to any mechanism for providing therapeutic fluid in a gaseous or liquid state . this would encompass any size , standard or custom , or pressurized gas tank , as well as tanks and systems for holding therapeutic fluid in liquid form for delivery to the patient as a gas , such as liquid oxygen systems . the tank 12 is contained in a tank - holding assembly 14 . the tank - holding assembly 14 is configured as a pouch 15 dimensioned to fit the tank 12 , and can include additional features to accommodate accessories or guide tubes or cannula for use with the tank 12 . although illustrated as a pouch 15 , it is contemplated that the tank - holding assembly 14 can be provided as a rigid or semi - rigid housing surrounding a source of therapeutic fluid , or even as “ ears ” secured to opposite sides of an outer tank . in fig1 , a pocket 16 is provided to hold cannulae , masks , and the like . the pouch 14 can be fabricated from any suitable material . such pouches are conventionally constructed from a fabric such as nylon , but it is contemplated that a pouch fabricated from a material such as neoprene would be advantageous . a shoulder strap assembly 18 is attached to the pouch 14 . the strap assembly 18 is configured to flex during movement of a human carrier of the tank assembly 10 to such a degree that the perceived weight of the tank 12 is lessened . examples of suitable straps can be seen in u . s . pat . no . 4 , 924 , 557 to heckerman and u . s . pat . no . 4 , 976 , 388 to coontz , and u . s . pat . no . 5 , 695 , 102 to jackson , the specifications of which are incorporated by reference herein . it is to be understood that the strap 18 is merely illustrative , and that any strap meeting the requirements of the present invention can be employed . the strap assembly 18 is constructed as a multi - element strap having a flexible section 20 flanked by a pair of structural sections 22 , 24 . in the illustrated example , the structural sections 22 , 24 are fabricated from a material that has less “ give ” than the material from which flexible section 20 is made . the first structural section 24 has a first end 26 secured to the tank pouch 14 and a second end 28 secured to the flexible section 20 . the second structural section 22 has a first end 30 secured to the tank pouch 14 and a second end 32 secured to the flexible section 20 . as shown in fig2 , the flexible section 20 includes a flexible element 34 and an adjustably structural element 36 secured to the flexible element 34 . the structural element 36 is longer than the flexible element 34 , and is secured in overlaying relation to the flexible element 34 . the flexible element can be configured from a suitable flexible material such as neoprene , and the structural element can be fabricated from a material such as cordura nylon . in fig1 , the strap assembly 18 is attached to the pouch 14 via spring clips 38 . it is contemplated that the strap 18 can be secured by any suitable mechanism . for example , fig3 shows a strap 40 secured to a pouch 42 via parachute buckles 44 , and fig5 shows a strap 46 sewn directly to a pouch 48 . the present invention is illustrated in the context of a single - shoulder - strap arrangement . however , it is also contemplated that the principles of the present invention are equally applicable to dual - strap , or “ rucksack ”- type arrangements . although the present invention has been described with reference to specific embodiments , those of skill in the art will recognize that changes may be made thereto without departing from the scope and spirit of the invention as defined by the appended claims .
a human - carried portable medical tank assembly includes a tank in a tank - holding assembly , such as a pouch . a shoulder strap is attached to the tank - holding assembly . at least a portion of the strap is configured to flex during movement of the human carrier of the tank - holding assembly to such a degree that the perceived weight of the tank and tank - holding assembly is lessened .