Patent Application
20100006712
This invention relates generally to a tubing assembly for waste disposal devices using flexible tubing which are used in the sanitary and odorless packaging and disposal of medical waste (such as, for example, gloves, gauze or any other waste which occurs in, for example, a doctor's office or hospital), industrial waste, diapers and any other waste wherein sanitary and/or substantially odorless disposal is desired.
Small waste disposal devices are common in hospitals, doctors' offices and other locations where waste is generated and must be disposed of in a sanitary manner. Further, if the waste emits odors, the waste disposal device should also contain odors emanating from the waste.
Several waste disposal devices are disclosed in U.S. Pat. Nos. 6,612,099, 6,804,930, 6,851,251 and 7,146,785, all of which are incorporated by reference herein.
It is an object of some embodiments of the present invention to provide new and improved tubing assemblies for waste disposal devices, in particular for use in the disposal of disposable medical wastes, industrial waste and diapers.
In order to achieve this objects and others, a support member for use in a waste disposal device in accordance with the invention includes a frame and a length of tubing having a closed or closeable front end and a rear end. The rear end of the tubing is fixed or otherwise attached to the frame. The tubing has a wider cross-sectional area at a portion proximate the front end than at a portion fixed to the frame.
The frame may be annular and formed entirely of cardboard or plastic, or using a combination of these materials. The frame may include aligning weakened portions on opposite sides which enable the frame to be folded about the weakened portions and thereby form a handle for a bag formed from the tubing. The frame may include a mechanism for attaching opposed portions of the frame together in order to form the handle, e.g., adhesive or hook and loop fasteners arranged on an upper surface of the frame.
The frame and the tubing may be designed for a single use. To this end, the tubing may have a length equal to or slightly larger than the height of the container in which it is to be used.
The invention, together with further objects and advantages thereof, may best be understood by reference to the following description taken in conjunction with the accompanying drawings, wherein like reference numerals identify like elements, and wherein:
Referring to the accompanying drawings wherein like reference numerals refer to the same or similar elements,
Waste disposal device 10 includes a substantially cylindrical container 12 having an outer wall and a base arranged at the lower end of the outer wall. An access door is formed in the outer wall and pivots about hinges to enable access to an interior waste-receiving chamber of the container 12 in which a pail may be placed to receive a bag which will be filled with waste during use of the waste disposal device 10. A closure mechanism is provided to secure the door in a closed position. A lid 14 is pivotally connected to the outer wall so as to be movable between an open position in which a waste insertion opening is exposed to enable insertion of waste into the container 12 and a closed position in which the lid 14 overlies and closes the waste insertion opening.
A general feature of waste disposal device 10, and other waste disposal devices disclosed herein, is that there is rotation of a mechanism which engages with the tubing relative to a stationary support or cartridge which supports or retains the tubing into which the waste is placed to thereby cause the formation of a twist in the tubing. Rotation of this mechanism would occur after insertion of waste to thereby form a twist above the inserted waste and inhibit release of odors from the waste.
To implement this technique, a twisting assembly 16 is movably seated on a support flange 18 of the container 12 and includes a twisting member 20. Twisting member 20 includes a substantially tubular outer wall 22, a substantially tubular inner wall 24, a substantially planar bottom support wall 26 and a circular gear rim 28 adjoining the outer wall 22 and on which projections 30 are formed (see
The twisting assembly 16 also includes a grasping member such as a membrane 32 arranged to engage with tubing. When the twisting assembly 16 is rotated, the engagement of the membrane 32 with the tubing causes the tubing to be twisted, i.e., form a twist in the tubing. The engagement of the tubing with the membrane 32 arises since the tubing passes through one or more of the slots 34 between fingers 36 of the membrane 32 (see
An aperture, through which the tubing passes, may be formed in the membrane 32 by other means, including, barely discernible small slits extending from a frame supporting the outer edge of the membrane 32 to a center.
The membrane 32 may be formed and constructed in different ways and is not limited to the presence of six fingers 36 separated by slots 34 as in the illustrated embodiment. The material of the fingers 36 may be selected to be flexible so that they flex downward in a direction away from the center when a person pushes waste through the central region of the membrane 32. The material of the fingers 36 should also be resilient so that the fingers 36 return to their initial form after the person has removed their hand from engagement with the membrane 32, or the inserted waste has been pushed downward through the membrane 32 and is no longer in engagement therewith.
For example, the membrane 32 may be made of silicone or another rubbery material. It may also be made of a flexible synthetic material which flexes under pressure and returns when pressure is removed. The tubing passing through the slots 34 may tend to flex the fingers 36 downward but the fingers 36 will still remain in engagement with the tubing and enable it to be twisted in the manner described below upon rotation of the membrane 32.
The edges of the fingers 36 which are expected to engage the tubing may be provided with a friction-enhancing material to increase the contact force between the fingers 36 and the tubing.
Membrane 32 may be formed integral with the twisting member 20 or separate therefrom and then attached thereto. For example, as shown in
Instead of the membrane 32, another form of a grasping member may be used. The general function of such a grasping member is to engage with the tubing as the tubing passes by it and is capable of twisting the tubing when rotated. For example, the grasping member may be a circular frame having fingers extending inwardly therefrom, or have the structure disclosed in the above-mentioned patents.
A rotation mechanism 38 is provided to rotate the twisting assembly 16, and may have the form shown in
For example, the rotation mechanism 38 in the illustrated embodiment includes an elongate rack gear 40 attached to the lid 14 and having a series of teeth on at least a portion of a longitudinally extending surface, and a gear assembly 42 arranged on the container 12 (see
Gear assembly 42 includes a plurality of gears, one of which is in meshing engagement with the rack gear 40, one of which is in meshing engagement with the projections 30 on the rim gear 28 of the twisting member 20 (which gear is referred to as a drive gear), and one or more optional intermediate gears which transfer the rotation of the gear meshing with the rack gear 40 to the drive gear. Gear assembly 42 also includes an appropriate mechanism for enabling one-way transmission of rotational force from the rack gear 40 to the drive gear. Such mechanisms are disclosed in the '785 patent. Other gear assemblies including more or less gears than shown can also be used to convert the downward movement of the rack gear 40 into rotational movement of the drive gear in only a single direction. For example, a bevel gear may be used.
Thus, in operation, when the lid 14 is closed, the rack gear 40 is moved downward causing rotation of the gears in the gear assembly 42 and ultimately rotation of the drive gear. The twisting member 20 is thus caused to rotate in view of the engagement between the projections 30 on the gear rim 28 and the drive gear. As such, the closing movement of the lid 14 is converted into rotational movement of the twisting member 20.
Other mechanisms for converting movement of the lid 14 (whether closure of the lid 14 or opening of the lid 14) into rotational movement of the twisting member 20 are also contemplated within the scope of the invention and include those rotation mechanisms described in the '785 patent.
An alternative rotation mechanism is shown in
Additional rotation mechanisms are disclosed in the '785 patent which do not require actuation based on closure of the lid 14 or pressing a button. For example, a motor may be provided and a sensor system provided which detects insertion of waste and thereafter causes actuation of the rotation mechanism.
A cartridge 50 of flexible tubing is arranged in an annular cavity 52 defined by the outer wall 22, inner wall 24 and bottom support wall 26 of the twisting member 20. Cartridge 50 is seated in the cavity 52 so that the twisting member 20 can move while the cartridge 50 remains stationary.
In order to provide for rotation of the twisting member 20 relative to the stationary cartridge 50 and thus the formation of a twist in the tubing in the slot(s) 34 between the fingers 36 of the membrane 32 (and which is engaged by the fingers 36), a mechanism for preventing rotation of the cartridge 50 is preferably provided. The anti-rotation mechanism or rotation preventing mechanism may be as in any of the embodiments described in the '785 patent. For example, cartridge 50 could be provided with a plurality of indentations, e.g., four, six, eight, that receive projections on the housing of the container 12 (see
Prior to use, the waste disposal device 10 is prepared by inserting the cartridge 50 and pushing a closed, front end of the tubing through the slots 34. Then, in use, the lid 14 is opened to expose the waste insertion opening. A load of waste is placed through the membrane 32, which is possible in view of the flexibility of the fingers 36 and the presence of the slots 34 therebetween, and into a bag formed by the flexible tubing in cartridge 50. The lid 14 is then closed causing the rack gear 40 to rotate the gear assembly 42 and ultimately the drive gear. Rotation of the drive gear, which is in meshed engagement with the projections 30 on the gear rim 28 of the twisting member 20, will cause rotation of the twisting assembly 16. Rotation of the twisting assembly 16 while the tubing passes through the slot(s) 34 of the membrane 32 and engages therewith will cause the tubing to be twisted and thereby form a twist above the inserted waste.
Successive waste insertions would be placed into the bag formed by the tubing in a similar manner. Although any previously formed twists may not be maintained and the tubing may untwist, the formation of a new twist will effectively serve to seal in any odors and close the bag anew after each waste insertion. The twist is not intentionally untwisted since the membrane 32 is prevented from rotating in the opposite direction in view of the construction of the gear assembly 42 or another part of the rotation mechanism. The end result will be the presence of a bag formed by the tubing and including numerous waste insertions altogether in a common space defined by the bag. Thus, there will not be a series of encapsulated waste packages.
Another embodiment of a twisting assembly is shown in
In this embodiment, the drive gear of the gear assembly 42 or the drive gear 76 connected to the motor 74 would engage with the projections 68 so that rotation of the drive gear would cause rotation of the twisting member 60 and thus the membrane 32 attached thereto. The cartridge 50 would be held stationary by any appropriate anti-rotation mechanism, for example, those disclosed in the '785 patent.
This embodiment can also be used with an alternative rotation mechanism which includes a U-shaped rack gear assembly. The U-shaped rack gear assembly includes a U-shaped frame which is coupled to the lid 14 at the upper ends of the U-shape and a rack gear on the inside surface of one leg of the U-shaped frame. The rotation mechanism includes a gear assembly having one gear in meshing engagement with the rack gear and one gear in meshing engagement with the projections 68 (the drive gear), and then optionally one or more gears interposed between the gear in engagement with the rack gear and the drive gear.
The cartridge 50 may be formed as shown in
In one embodiment, the tubing is formed to have a wider cross-sectional area in that portion which will be situated in the waste-receiving chamber of the container 12 than in the area around the cartridge 50 itself (see
The cartridge 50, without the tubing, may be formed entirely of cardboard or plastic or another material and designed to be foldable about a linear weakened region, e.g., a score line, to allow for folding of a part of the cartridge 50 onto itself. In this case, the cartridge 50 could be used as a handle for the bag of waste formed by the insertion of the waste into the tubing during use of the waste disposal device 10. After the container 12 is full of waste, the cartridge 50 would be folded about the weakened region and the handle inserted through the membrane 32 so that the handle can be grasped upon opening the access door. The bag of waste is therefore easily handled and disposed of into a larger waste container.
In one embodiment, it is envisioned that the cartridge 50 would not have a stack of flexible tubing but rather only a bag (tubing with a closed, front end) would be attached at the open end to the cartridge 50 and may be entirely extended into the container 12 prior to the first use of the waste disposal device 10. This bag may be formed as described above with a wider cross-sectional area in that portion to be situate din the waste-receiving chamber of the container 12 and a smaller cross-sectional area around the cartridge 50. As such, the cartridge 50 may be considered as a tubing support member. In this case, the tubing support member 54, shown in
The length of the tubing 80, i.e., the extension of the bag 82 from the region around the supports 88 to the front closed end of the bag 82, may be in a range from about 22 inches to about 36 inches. This length, which substantially corresponds to the height of the bag 82 formed from the tubing 80, may depend on the height of the container 12, and for this range, it assumed to be about 22-24 inches. Of course, for a larger container 12, a larger bag 82 would be used, i.e., a larger length of tubing 80 would be attached to the supports 88.
It is contemplated that the tubing support member 54 and attached tubing 80 would have a single use construction and would be disposed of when desired, regardless of whether the bag 82 formed from the tubing 80 is full or not.
In its sale condition, the tubing support member 54 may have the tubing 80 folded and attached thereto. The user would then have to place the tubing support member 54 into the cavity in the twisting assembly 16, 56 and then push the closed front end of the bag 82 formed from the tubing 80 into the interior of the container 12. The tubing 80 may either be formed with a closure at the front end, as disclosed in the '785 patent, or require the user to manually tie the front end of the tubing 80 into a knot. In the latter case, the height of the tubing 80 may be larger than the height of the container 12 to allow for the formation of the knot at the front end.
Waste disposal device 10 may be used for any type of waste, including but not limited to medical waste from hospitals, doctors' offices, home health care personnel and facilities, nursing homes, biohazard laboratories, and the like. The waste disposal device 10 may also be used for personal hygiene such as for disposing of soiled diapers.
An advantage of the invention over waste disposal devices, such as disclosed in the '785 patent, and which are used to form a series of encapsulated waste packages is that significantly less tubing is used since each waste insertion is not individually encapsulated. Rather, there is a common bag formed from the tubing and multiple waste insertions are placed into this bag. Since less tubing is required, the cartridge 50 may be quite thin in comparison to cartridges used in waste disposal devices that form a series of encapsulated waste packages.
While particular embodiments of the invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from the invention in its broader aspects, and, therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention.
