Patent Application
20140295721
1. Field of the Disclosure
The present disclosure relates to a patient transporter having sponsons to provide buoyancy.
2. Description of Related Art
One difficulty with a patient transporter, also called litter or stretcher, is that the transporters are not adapted for transporting the patient over lakes, rivers, streams, and other water tributaries. When carrying an injured person on a patient transporter across a tributary of water, the injured person and transporter must be physically carried by two or more personnel who are themselves attempting to navigate across the tributary. Also, in those instances where an injured person is carried on a patient transporter across a water tributary, the water can rise onto the transporter, or worse, can completely submerge the transporter and expose the person to further injury or even drowning.
The present disclosure provides a patient transporter having one or more sponsons to provide buoyancy when carrying a person on the patient transporter across water.
The present disclosure also provides a patient transporter having one or more sponsons that are uninflated prior to use, but are readily inflatable when needed for buoyancy.
The present disclosure still further provides a patient transporter having sponsons that, when inflated, block water from rising onto the patient transporter or contacting the person being carried thereon.
The present disclosure yet further provides a patient transporter having sponsons that can act as a wave-break when transporting a patient over moving water, such as a river.
Referring to the drawings, and, in particular,
“Sponson” is defined herein as a buoyant appendage that is connected to soft goods, such as a patient transporter that is used for transporting an injured person.
Sponson(s) 50 can be used to provide buoyancy, resist capsizing, and as a wave-break that provide flotation capabilities to a transporter being moved across a water surface, increasing patient safety and reducing exertions of the one or more persons who are carrying the injured person on the patient transporter. Each sponson 50 can also be a structural barrier that reduces or prevents water from coming over the sides of the patient transporter and contacting the person being carried.
In an embodiment of the present disclosure, a patient transporter having one or more sponson(s) 50 can carry a patient up to 350 pounds.
In an embodiment of the present disclosure, each sponson 50 can be approximately 6 feet to 8 feet in length, with about a 16 inch (16″) diameter (cylinder diameter). The total length of each sponson 50 can be entirely within the footprint of the patient transporter, or a portion of sponson 50 can extend beyond the head and/or foot ends of the patient transporter 100.
Each sponson 50 can be individually or simultaneously inflated. A patient transporter can be connected to, or simply placed on top of, material 40, so that the transporter is stably positioned between sponsons 50.
As shown in
Material 40 is connected to each sponson 50 by a fastener, such as connection band 45. Other fasteners that can be used to connect sponson 50 to material 40, include, but are not limited to, strap, clip, tie-down, and d-clip.
In another embodiment, sponsons 50 and material 40 can have a cover that makes them a single piece.
Material 40 is preferably a textile material, including, but not limited to, an open cell material (such as a mesh) or a closed cell material (such as a cloth). To ensure that material 40 can support the weight of a patient transporter and a person being carried thereon, material 40 has a tensile strength greater than 500 lbs.
In another embodiment, each sponson 50 is a separate inflatable structure that is not directly connected by material 40 to another sponson 50, but rather each sponson 50 is directly attached to a soft goods portion of patient transporter 100.
An example of a patient transporter that can include sponsons includes, but is not limited to, a patient transporter with an expandable, deployable support structure described in co-pending International Application No. PCT/US12/68838, titled “Patient Transporter With Expandable/Deployable Support Structure,” published as International Publication No. 2013/086540 A2, which is incorporated by reference herein.
As discussed above, a patient transporter can be placed on material 40 between the two sponsons 50 so that the entire structure can float, or alternatively, provides buoyancy that allows the structure to be moved across a body of water. The patient transporter placed on material 40 is suspended between two sponsons 50, and can be affixed to sponsons assembly 10 either by straps, d-clips, and tie downs, although other fasteners may be used.
A consideration of the designs of the present disclosure is a balancing of buoyancy and displacement. While it is much easier to inflate an air bladder structure to provide buoyancy than to provide rigidity, it is important to balance the considerations of buoyancy and displacement in the selection of sponsons.
Displacement is the pushing away of a fluid when an object is immersed in it. While not limiting the present disclosure to this theory, if a system is considered that will hold 500 lbs. of weight, and the overall weight of the system is desired to be 20 lbs., then this implies (in accordance with Archimedes' principle that “an object partially or wholly immersed in a fluid is buoyed up by a force equal to the weight of the fluid displaced by the object”), using rough calculations, the desired structure would need to support 1040 lbs. (i.e., 2 times the weight, plus the system) to have sponsons 50 half-submerged. Based on water (sea water) having an approximate density of about 64 lbs./cubic feet, then about 16.25 cubic feet of volume is needed to support this weight. Thus, with two (2) sponsons 50, each sponson 50 should be about 8.125 cubic feet. However, sponsons 50 of
Further, since sponsons 50 are affixed to soft goods, namely, material 40, at strategic points, the rigid structure placed thereon stays on top of the water. Significantly, sponsons 50 are placed outboard, i.e., along the sides of the transporter and/or the pad. Sponsons 50 also serve an important function as a wave-break to enhance the well-being and safety of the patient being carried, since even with a degree of buoyancy, there would still be a risk of adverse effects or even drowning if the water were to rise over the top of the transporter and the patient.
Sponsons 50 need to provide sufficient buoyancy to keep the entire transporter and the patient above the water line. Preferably, sponsons 50 provide sufficient buoyancy that only the bottom surface of sponsons 50 contact the water surface, such that even textile material 40 is above the water line. If transporter 100 includes a rigid support structure, as in the example above, the rigid support structure reduces or prevents any sagging of the transporter between sponsons 50, even with the full weight of the person (and the patient's center of gravity) positioned between sponsons 50.
Referring to
Chambers 130 can be inflated by any common means including, but not limited to, by mouth, foot pump, and ambi-bag.
Chambers 130 can have an openable sealing element connected to one sealable end. The openable sealing element is normally a valve element that allows flow in one direction to help prevent leakage of the gas/air.
The material for sponsons 50 of
Sponsons 50 and chambers 130 require appropriate sizing and volumetric area to allow them to support the weight of the rigid litter and the patient thereon, and to maintain the required buoyancy while transporting the patient on water. Buoyancy is an upward force on an object immersed in a fluid. In addition, each chamber 130 is internal to each channel 120 so that channel 120 must have a large enough diameter to permit for this inflation of chamber 130.
Referring to the embodiment of
The structure of either embodiment provides for the transporter assembly to be a kit that enables on, such as, for example, special forces personnel in a war area to move rapidly and for longer periods of time, even in mountain areas or in extreme cold, due to the significantly reduced weight of the present assemblies.
As used in this application, the word “about” for dimensions, weights, and other measures means a range that is ±10% of the stated value, more preferably ±5% of the stated value, and most preferably ±1% of the stated value, including all subranges therebetween.
It should be understood that the foregoing description is only illustrative of the present disclosure. Various alternatives and modifications can be devised by those skilled in the art without departing from the present disclosure. Accordingly, the present disclosure is intended to embrace all such alternatives, modifications, and variances that fall within the scope of the present disclosure.
This application claims the benefit of U.S. Provisional Application No. 61/801,077, filed on Mar. 15, 2013.
| Number | Date | Country | |
|---|---|---|---|
| 61801077 | Mar 2013 | US |
