Patent Application
20110160526
Some women, especially women who have given birth to one or more children and/or older women, can experience incidences of involuntary urine loss due to stress urinary incontinence or combined stress and urge incontinence. For example, a sneeze or cough can increase the intra-abdominal pressure impinging on a person's bladder and cause the involuntary release of urine. The frequency and severity of such urine loss can increase as the muscles and tissues near the urethro-vaginal myofascial area grow weaker. It has also been recognized that the urinary sphincter muscle, which is located at the upper end of the urethra adjacent to the bladder, works well at sealing off the passing of urine from the bladder to the urethra when it has a round or circular cross-sectional configuration. However, when this passageway becomes distorted into a cross-sectional configuration having more of an elliptical or oval appearance, the sphincter muscle cannot close properly and the tendency for involuntary urine loss increases.
As the worlds female population ages, though certainly not limited to women of age, there is an ever increasing need for a non-surgical procedure to reduce the involuntary urine loss commonly associated with “stress urinary incontinence.” Today, there are a number of products available for this purpose. Essentially all of these products can only be purchased with a prescription and they typically require physical insertion and/or adjustment by a medical doctor or a nurse practitioner in order to perform correctly. In addition, most available urinary incontinence devices must be thoroughly cleansed and re-used, as opposed to being a one-time use disposable product.
Incontinent women who do not wish to use the current urinary incontinence devices attempt to prevent leakage onto garments by wearing absorbent pads or liners every day. However, this can be undesirable for many women. In addition, women who prefer to wear tampons for menstruation desire a non-pad product for managing their urine leakage needs and would find such a solution very attractive.
One solution to this problem is a disposable urinary incontinent device. Such a device typically includes an inner member that can be resilient, liquid-stable and/or non-absorbent disposed partially or completely within a cover sheet. Typically, such a device can be inserted into the vagina while in a compressed state, and then allowed to expand inside the vagina to provide pressure to the urethra, thereby reducing or eliminating involuntary urine leakage. Exterior surfaces of the device are in direct contact with the tissues of the vaginal canal, and typically rely on frictional forces to hold the incontinence device in the desired location. However, it has been found that such devices are susceptible to causing irritation to the tissues inside the vagina, and in some circumstances, the device can become stuck in the vagina such that the device cannot be removed by the user.
Thus, there is a need for a disposable urinary incontinence device that reduces or eliminates irritation to the vaginal tissues, and can reduce or eliminate the occurrence of the device becoming un-removable by the user. In addition, the device would desirably be relatively low cost and could be purchased without a prescription. Furthermore, there is a need for a urinary incontinence device which is easier for women to insert into and remove from their bodies than prior devices.
In response to the needs discussed above, a disposable urinary incontinence device comprises a liquid-stable resilient member and a cover sheet that envelops the liquid-stable resilient member to form an elongated member having a tubular profile. The elongated member has a first end, a second end. The cover sheet exhibits a skin-facing surface contact area of less than 30% at a depth of 10%, as measured by the Surface Contact Area Test. In addition, the cover sheet has a static coefficient of 0.275 to 0.150, and a dynamic coefficient of friction of 0.230 to 0.150, as measured in accordance with ASTM 1894-01. In further aspects, the cover sheet exhibits a static coefficient of friction of 50 to 250 at a sled weight of 300 g, as measured by the Surrogate Skin Coefficient of Friction Test. In still further aspects, the cover sheet exhibits a cycle 1 MD Loading Energy of 6500 g-cm-7500 g-cm, as measured by measured by the Multi-Cycle Stress/Strain Test. In yet further aspects, the cover sheet exhibits a bending stiffness of 0.005 gf cm2/cm to 0.030 gf cm2/cm, as measured by the KES Stiffness Test. In still further aspects, the cover sheet has a thickness of 0.1 mm-1 mm, as measured by the Thickness Test. In yet further aspects, the cover sheet has a basis weight of 10 gsm-30 gsm. In still further aspects, the cover sheet comprises a hydrophobic thermoplastic film is selected from polyethylene or polypropylene. In yet further aspects, the liquid-stable resilient member is non-absorbent, as measured by the Spinning Retention Capacity Test. In still further aspects, the liquid-stable resilient member has a resilient compression from 60% to 90% and a resilient expansion from 60% to 100%, as measured by the Resiliency Test. In yet further aspects, the liquid-stable resilient member is a surge material comprising a plurality of thermoplastic fibers heat bonded to one another to form a lofty nonwoven web having a basis weight of at least 20 grams per square meter, a void volume of between 80 and about 120 centimeters per gram of web while under a pressure of 689 dynes per square centimeter, a permeability of about 8,000 to about 15,000 darcy, a porosity of at least 95 percent, a surface area per void of 10 to 25 square centimeters per cubic centimeter and a compression resilience in both the wet and dry state of at least about 60 percent.
In further aspects, the disposable urinary incontinence device further comprises an additional non-absorbent layer, wherein the additional non-absorbent layer is adjacent a planar surface of the liquid-stable resilient member. In still further aspects, the elongated member comprises an end seal at the first end and at the second end, each of which is substantially free of the resilient member. In yet further aspects, the disposable urinary incontinence device further comprises a fold guide in the form of an embossment disposed on the cover sheet.
In further aspects, the elongated member has a first fold region disposed between the first end and the second end, a second fold region disposed between the first end and the first fold region, a third fold region disposed between the second end and the first fold region, a first portion located between the first end and the second fold region, a second portion located between the second end and the third fold region, a third portion located between the first fold region and a second fold region, and a fourth portion located between the first fold region and the third fold region; wherein the elongated member is in a folded condition such that the first portion is substantially aligned adjacent to the second portion, the first portion is substantially aligned adjacent to the third portion, the second portion is substantially aligned adjacent to the fourth portion, and the first portion and the second portion are disposed between and adjacent to the third portion and the fourth portion to form a disposable urinary incontinence device having a W-shaped profile. In further aspects, the disposable urinary incontinence device further comprises a first aperture adjacent the first end of the elongated member and a second aperture adjacent the second end of the elongated member, wherein the first aperture and the second aperture are substantially aligned in the W-shaped profile-folded elongated member. In still further aspects, the first aperture is located from 2 mm to 20 mm from the first end and the second aperture is located 2 mm to 20 mm from the second end. In yet further aspects, the disposable urinary incontinence device further comprises a withdrawal member, wherein the withdrawal member is present in both the first aperture and the second aperture.
In further aspects, the disposable urinary incontinence device has a transverse device compression from 100 gf to 900 gf, as measured by the Transverse Device Compression Test. In still further aspects, the disposable urinary incontinence device having a W-shaped profile has been compressed to form a pledget having an insertion end and a trailing end. In yet further aspects, the pledget has substantially equivalent wet and dry expansion characteristics. In still further aspects, the disposable urinary incontinence device further comprises an applicator having an insertion end and a trailing end, wherein the pledget is disposed within the applicator such that the insertion end of the pledget is adjacent the insertion end of the applicator. In still further aspects, the applicator comprises: a tapered barrel having an insertion end, a trailing end and an elliptical cross-section profile; a gripping portion having an insertion end, a trailing end and a finger contour; and a hollow plunger having an insertion end, a trailing end, a head flange, a rear flange, a shaft portion, and a substantially race-track cross-section profile; wherein the insertion end of the gripping portion is connected to the trailing end of the barrel; and wherein the head flange and at least part of the shaft portion are disposed within the gripping portion.
Numerous other features and advantages of the present invention will appear from the following description. In the description, reference is made to exemplary embodiments of the invention. Such embodiments do not represent the full scope of the invention. Reference should therefore be made to the claims herein for interpreting the full scope of the invention. In the interest of brevity and conciseness, any ranges of values set forth in this specification contemplate all values within the range and are to be construed as support for claims reciting any sub-ranges having endpoints which are real number values within the specified range in question. By way of a hypothetical illustrative example, a disclosure in this specification of a range of from 1 to 5 shall be considered to support claims to any of the following ranges: 1-5; 1-4; 1-3; 1-2; 2-5; 2-4; 2-3; 3-5; 3-4; and 4-5.
The foregoing and other features, aspects and advantages of the present invention will become better understood with regard to the following description, appended claims and accompanying drawings where:
Repeated use of reference characters in the present specification and drawings is intended to represent the same or analogous features or elements of the present invention. The drawings are representational and are not necessarily drawn to scale. Certain proportions thereof may be exaggerated, while others may be minimized.
Test Methods
Unless otherwise noted, all tests are performed at a temperature of 23±2° C. and a relative humidity of 50±5%.
Thickness Test
The thickness value of a sample specimen is determined using a thickness tester such as seen in
To perform the procedure, a block 2370 having a length of 50 mm and a width of 44 mm is placed onto the planar top surface 2322 of the granite base 2320. The block 2370 is constructed of acrylic and is flat and smooth on at least the planar bottom surface 2372. The thickness and weight of the block 2370 is configured such that the thickness tester 2310 provides a force of 166 gf. Next, the thickness tester 2310 is gently lowered along the clamp shaft 2330 such that the bottom surface 2362 of the plunger 2360 is in direct contact with the longitudinal 1 and transverse 2 center of the planar top surface 2374 of the block 2370, and the plunger length is at approximately 100% in the z-direction 3. The digital indicator 2350 is then tared (i.e., zeroed) by pressing the “zero” button 2357, hereinafter referred to as the “taring step.” The digital display 2355 of the digital indicator 2350 should display “0.00 mm” or equivalent.
The block 2370 and plunger 2360 are then raised vertically (z-direction 3) as a unit, and the sample specimen is placed onto the top surface 2322 of the granite base 2320 in the same location that the block 2370 was positioned during the taring step, such that the sample specimen is substantially centered longitudinally 1 and transversely 2 under the planar bottom surface 2372 of the block 2370. The block 2370 and plunger 2360 are then gently lowered as a unit such that the bottom surface 2362 of the plunger 2360 remains substantially centered longitudinally 1 and transversely 2 on the planar top surface 2374 of the block 2370. The planar bottom surface 2362 of the block 2370 should remain parallel to the planer top surface 2322 of the granite base 2320 during measurement. After 3 seconds, the measurement from the digital display 2355 is recorded to the nearest 0.01 mm to provide the thickness of the sample specimen.
Spinning Retention Capacity Test
The Spinning Retention Capacity Test measures the amount of water that a material holds to determine whether the material is considered to be “non-absorbent” as the term is used herein. To perform the procedure, a sample specimen of material is weighed to the nearest 0.1 grams, and the weight is recorded as the Dry Weight. The sample is then completely submerged in tap water having a temperature of 23±2° C. for 10 minutes. If the sample floats, then the sample should be gently pushed and held under the water surface via the tester's fingers, or equivalent (hereinafter referred to as the “saturation step”). After the 10 minute saturation step, the saturated sample is gently removed from the water and is placed into a model no. Model 776SEK-TS SPIN-X spindryer having a diameter of 34.2 cm and a height of 63.5 cm, a weight of 11.3 kg and a wet load capacity of 4.5 kg (available from Spin-X, having a place of business located in Houston, Tex., U.S.A.). The spindryer spins at 3,300 R.P.M. and produces 1,340 G′ forces. The spindryer is turned on and allowed to reach maximum speed. Once the maximum speed has been reached, the sample is allowed to spin for 2 minutes, at which point the spindryer is turned off. Once the spindryer has stopped, the sample is gently removed from the spindryer and weighed to the nearest 0.1 gram and is recorded as the Retention Weight. The Spinning Retention Capacity is then calculated in units of grams water per gram material using the following formula:
Retention Wt.−Dry Wt.=Spinning Retention Capacity.
Elongated Member Compression Test
To perform this procedure, an MTS Synergie Model 200 tensile testing machine (or equivalent) equipped with a computer-based control and data acquisition system running MTS TESTWORKS software (available from MTS Corporation, having a place of business located in Eden Prairie, Minn., U.S.A.). A software-deflection-compensated load cell was used for this test. Steel circular compression platens were attached to the load cell (upper platen) and the base of the tensile machine (lower platen) (available from Instron Worldwide, having a place of business located in Norwood, Mass., U.S.A., or equivalent). The upper platen had a diameter of 19 mm, and the lower platen had a diameter of 889 mm. Both platens had flat, smooth finishes, and provision was made to align both platen contact surfaces such that there was no more than a 0.005 inch (0.0127 centimeter) gap between any point on the contact surface of the upper platen and the lower platen when the two platens were brought into physical contact at any other point when mounted on the tensile machine. The load cell was properly calibrated according to the manufacturer's instructions (including necessary warm-up periods) and was zeroed with the platens attached.
After the platens were properly installed and aligned, the platens were carefully brought together and loaded to a pressure of 20 kPa. At this point, the elongation channel of the tensile machine was zeroed. The tensile machine was then backed-off exactly 2 cm under software control and the elongation channel was re-zeroed. This left the platen spacing at 2 cm when the tensile frame elongation channel read zero. All subsequent separation measurements were made based on programmed software calculations that corrected for this 2 cm offset between actual platen spacing and elongation channel reading. (Use of an offset is a safety precaution known to those skilled in the art; it prevents platen crashing if a machine operator accidentally sends the tensile machine to the ‘home’ position.)
A compression test was initiated by carefully centering a single elongated member having a length and diameter equal to, or greater than, the diameter of the upper platen onto the lower platen. The tensile machine crosshead was then manually moved to a position slightly above the elongated member and the test was run through the TESTWORKS software. This test routine compressed the elongated member to a pressure of 20 kPa at a speed of 1 cm per minute. Immediately upon achieving the 20 kPa pressure, the tensile frame reversed direction and released compression. The reverse speed was also 1 cm per minute. This completed the test. Data was recorded for both the compression and the rebound portions of the test to allow subsequent calculation of results. The TESTWORKS software automatically performed the pertinent calculations, providing Energy Loading (g-cm), Energy Uploading (g-cm) and Hysteresis Loss (%).
Transverse Device Compression Test
The Transverse Device Compression Test measures the compression properties of the urinary incontinence device as a whole in the transverse 2 direction, such as shown in
After the platens were properly installed and aligned, the platens were carefully brought together and loaded to a pressure of 20 kPa. At this point, the elongation channel of the tensile machine was zeroed. The tensile machine was then backed-off 7.62 cm under software control and the elongation channel was re-zeroed.
This left the platen spacing at 7.62 cm when the tensile frame elongation channel read zero. All subsequent separation measurements were made based on programmed software calculations that corrected for this 7.62 cm offset between actual platen spacing and elongation channel reading. (Use of an offset is a safety precaution known to those skilled in the art; it prevents platen crashing if a machine operator accidentally sends the tensile machine to the ‘home’ position.)
A compression test was initiated by carefully centering a incontinence device onto the lower platen. The tensile machine crosshead is then manually moved to a position slightly above the incontinence device and the test was run through the TESTWORKS software. This test routine compressed the elongated member at a speed of 12.7 cm per minute to a distance of 2.5 cm from the top platen to the lower platen. The compression is expressed in gf.
Resiliency Test
This test measures the resiliency of a sample specimen. The thickness of the sample is first measured under a force of 166 gf for 3 seconds to obtain the Initial Thickness of the sample. A force of 11 kgf is then applied to the sample using suitable means for 30 seconds and the thickness is measured as the Compressed Thickness. The 11 kgf is then removed and the sample is allowed to expand for 5 minutes. After the 5 minutes, the thickness of the sample is again measured under a force of 166 gf for 3 seconds to obtain the Final Thickness. Suitable means for measuring the thickness include the Thickness and the Elongated Member Compression Test described above, or equivalent, modified appropriately to fulfill the requirements of this Resiliency Test. The Resilient Compression and the Resilient Expansion are then calculated using the following formulas:
Resilient Compression (%)=[(Initial Thickness (mm)−Compressed Thickness (mm)/Initial Thickness (mm)]×100%
Resilient Expansion (%)=Final Thickness (mm)/Initial Thickness (mm)
Surface Contact Area Test
This test measures the percent contact area at a depth of 10% as measured from the outer surface (i.e., the skin-facing surface) of a cover sheet material utilizing FRT profilometer scans which provided 3-dimensional maps of the planar cross section for each material. The surface profile of a cover sheet material is recorded using an FRT MICROPROF non-contact (optical) profilometer (available from FRT of America, LLC, having a place of business located in San Jose, Calif., U.S.A.). Five representative areas are profiled per sample. The profilometer records height values (z) over an array of horizontal positions (x & y) providing a color coded topographic map and 3-D rendering from which interpretive maps and spatial three dimensional measurements can be extracted. The vertical scale is set such that zero elevation is at the top. As one moves downward through the material, a particular surface area is intersected until, at the base elevation (maximum thickness of the material), 100% of the profile has been intersected. The benefit of this tool is that the planar surface area intersected at a particular depth can be determined.
To perform the procedure, a sample cover sheet material is placed into the profilometer and the height and a 3-D profile of the material is recorded. Based on the height for each sample, a planar cross-section of the 3-D profile that is a distance of 10% as measured from the top is selected. The cross-section at 10% depth is rotated to display a top view of the cross-section. The color scale is then adjust appropriately such that areas that are adjacent to, and in direct contact with, the x-y plane at the 10% depth location are displayed as a dark color, while all else is displayed as a contrasting light color. The image is then printed and subjected to image analysis to provide the a measure of the Surface Contact Area (i.e., the area of the dark color) and the Total Surface Area of the image. The Percent Contact Area is calculated using the following formula:
% Surface Contact Area=(Surface Contact Area/Total Surface Area)×100%.
Coefficient of Friction Test
This test provides the static and dynamic coefficient of friction for a cover sheet of the present invention as tested against alternative surfaces, namely surrogate skin. To perform the procedure, a TMI Model 32-06 C-O-F machine is utilized (available from Testing Machines Inc., having a place of business located in Ronkonkoma, N.Y., U.S.A). All samples are tested in the machine direction (MD).
Double-sided tape is placed on each side of the metal edges of the C-O-F sled (not on the foam.) Zero the tester by pressing the SLED key and the soft arrow key below the word “zero.” Raise the anti-skid guide located on the arm by the load cell by lifting the guide upwards, so it is vertical to the testing bed. Press the SLED key. Press the left soft arrow key below the word SLED on the display panel. Press the soft arrow key below B on the display panel. The display will read ENTER B-SLED WEIGHT (gram). Using the keypad, type in the weight of the sled and press ENTER. Enter the load cell ID number and presses ENTER. Mount the calibration fixture to the testing bed so the clamping device on the right-hand side of the testing bed secures it. The pulley of the calibration fixture should extend over the right side of the tester. Attach the string supplied with the calibration fixture to the load cell, connect the S-hook to the load cell mount, and drape the string over the pulley wheel so that the other S-hook hangs over the side of the tester. Hang a 500 gram weight from the S-hook. The load on the display must read 500±4 grams. If the 500 gram weight is correct, hang the remaining weights (200 g, 100 g, 50 g, 20 g, and 10 g) one at a time. The load for the remaining weights must be within ±2 grams of its stated weight. Press the UNIT key to change the units from grams to C-O-F. Remove the calibration weights, fixtures, and string. Enter the test speed of 15.2 cm/min (6 in/min) and press ENTER. The display will read CF for 6 IN/MIN: 850 (this number will read the last calibration value). Type in 850 for New CF and press ENTER. Place the sled pin in the load cell mount and lower the anti-skid guide. Lay the ruler next to the sled. Press the TEST key and start the stopwatch at the same time. Time how long it takes the sled to travel 152.4 mm (six inches). The time must be 60±0.5 second. Remove the sled and lift the anti-skid guide. Press ENTER to return the arm to the start position. The equipment is now ready for testing specimens.
Identify and mark the machine direction on the test side of the cover sheet sample. Cut the surrogate skin and the cover sheet sample 120±1 mm in the machine direction (MD) and 67±1 mm in the cross direction (CD). Make a 25.4±10 mm centered cut into one of the 67 mm ends of each cut sample (this allows the specimen to fit around the guide pin on the test sled).
Place one layer of the surrogate skin (VITRO SKIN, available from IMS Inc., having a place of business located in Portland, Me., U.S.A.) on the testing bed. Clasp the surrogate skin in the clamp or line up the right side of the surrogate skin over the double-sided tape and press down to attach the surrogate skin to the tape. Then place a layer of the 120 mm cover sheet test sample, test side down, on the surrogate skin. Place the C-O-F testing sled, foam side down, on the cover sheet sample and wrap the front end of the layers up onto the double-sided tape (or place under the clamp if that is being used). Position the sled pin in the load cell mount. Place the anti-skid guide over the sled, making sure that the sled is centered under the anti-skid guide. Start the test by pressing the TEST key. When the test is completed, lift the anti-skid guide and remove the sled. Press ENTER to return the arm. Record the values displayed. The first value is the “Static” coefficient of friction value. The second value is the “Kinetic” (dynamic) coefficient of friction value. Each test sample should be tested ten times (n=10) and the average value is reported.
Multi-Cycle Stress/Strain Test
This test is used to determine the elongation and retraction properties of the cover sheet of the present invention. A Constant-Rate-of-Extension (CRE) tensile tester with a computer-based data acquisition and frame control system with standard capacity grips and faces combination is designed for a maximum load of 5000 grams and a load cell (available from Instron Corporation or MTS Systems Corporation), and using MTS TESTWORKS for Windows, or equivalent (available from MTS Systems Corporation). Tensile macro output data for the two-cycle test includes the load at specified elongation points on the extension and retraction curves for each cycle, total energy under the curve for extension and retraction (TEA) for each cycle, hysteresis for each cycle, the ratio of TEA retraction to TEA elongation for each cycle, immediate set % for cycle one only, and sample width. The data are displayed and recorded for ten specified elongation points along the extension and retraction curve during each cycle of the two-cycle test. The points are 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100% elongation in the standard set-up. Stress/strain data indicate the force required to elongate the specimen. The load at elongation output characterizes the force at the specified point of specimen elongation. The higher the force value, the more difficult it is to elongate the specimen. The lower the hysteresis value, the more elastic the material.
To perform the procedure, cut the specimen (MD or CD) to have dimensions of 76±1 mm by 152±1 mm. Center one end of the specimen in the upper grip. Close the grip. Insert the opposite end of the specimen. Start the crosshead.
When the test is finished and the crosshead has returned, remove the specimen from the grips. Record the TEA extension and TEA retraction, various load values and extension values, percent hysteresis loss, and immediate set percent for cycle one and two. Measurements are reported as Loading Energy, Unloading Energy and Hysteresis Loss for each cycle.
KES Bend Test
The bending properties of the cover sheet material are measured using a KES Bend Tester (Model KES-FB-2) available from Kato Tech Co, LTD, having a place of business located in Japan. To perform the procedure, the test speed is set at 0.5 cm−1/sec, the “SENS” (which is the sensitivity setting) is set at “2×1” and the VAR/SET switch is toggled to “SET” to set the curvature at 2.5 cm−1. The bending through curvature 0 to 2.5 cm−1 denotes as the forward bend while bending through curvature 0 to −2.5 cm−1 denotes as the backward bend. Two parameters measured by the bending tester are bending stiffness (B) expressed in gf cm2/cm and bending hysteresis (2HB) expressed in gf cm/cm. The bending stiffness is defined as the average slope of bending moment versus curvature in the forward and backward bend. In the forward bend, the slope is taken in curvature between 0.5 cm−1 and 1.5 cm−1 while in the backward bend, the slope is taken in curvature between −1.5 cm−1 and −0.5 cm−1. The bending hysteresis is a measure of recovery of the sample after it has been bent and it is the average distance of the bending and recovery curves at the curvatures of 1.0 cm−1 (i.e. in forward bend) and −1.0 cm (i.e. in backward bend).
The sample was cut into a size of 10 cm×10 cm with two opposite sides of sample running parallel to Machine Direction (MD) and two perpendicular sides of sample running parallel to Cross Machine Direction (CD). Samples are selected that are free from all folds, wrinkles, crimp lines, and of any distortions that would make these samples abnormal from the rest of the sample. The bending properties of the material are measured in MD such that MD of the sample is perpendicular to the vertical front and back clamps in the Bend Tester. The back clamp is fixed at one location while the front clamp is moveable. The distance between the front and back clamps is at a default of 1 cm. The result of each material sample is the average of data from five replications of sample (n=5). The data is acquired using KES-FB System Measurement Program Ver. 7.07E/For Win 98/2000/XP by Kato Tech Co., LTD.
It should be noted that, when employed in the present disclosure, the terms “comprises,” “comprising” and other derivatives from the root term “comprise” are intended to be open-ended terms that specify the presence of any stated features, elements, integers, steps, or components, and are not intended to preclude the presence or addition of one or more other features, elements, integers, steps, components, or groups thereof.
The term “attach” and its derivatives refer to the joining, adhering, connecting, bonding, sewing together, or the like, of two elements. Two elements will be considered to be attached together when they are integral with one another or attached directly to one another or indirectly to one another, such as when each is directly attached to intermediate elements.
The term “bond” and its derivatives refer to the joining, adhering, connecting, attaching, sewing together, or the like, of two elements. Two elements will be considered to be bonded together when they are bonded directly to one another or indirectly to one another, such as when each is directly bonded to intermediate elements.
The term “disposable” is used herein to describe absorbent articles that are not intended to be laundered or otherwise restored or reused as an absorbent article after a single use.
The terms “elastic,” “elasticized,” “elasticity,” and “elastomeric” mean that property of a material or composite by virtue of which it tends to recover its original size and shape after removal of a force causing a deformation. Suitably, an elastic material or composite can be elongated by at least 50 percent (to 150 percent) of its relaxed length and will recover, upon release of the applied force, at least 40 percent of its elongation.
The term “fiber” refers to a continuous or discontinuous member having a high ratio of length to diameter or width. Thus, a fiber may be a filament, a thread, a strand, a yarn, or any other member or combination of these members.
The term “hydrophilic” describes materials which are wetted by aqueous liquids in contact with the materials. The degree of wetting of the materials can, in turn, be described in terms of the contact angles and the surface tensions of the liquids and materials involved. Equipment and techniques suitable for measuring the wettability of particular fiber materials or blends of fiber materials can be provided by a Cahn SFA-222 Surface Force Analyzer System, or a substantially equivalent system. When measured with this system, materials having contact angles less than 90 degrees are designated “wettable” or hydrophilic, and fibers having contact angles greater than 90 degrees are designated “nonwettable” or “hydrophobic”.
The term “join” and its derivatives refer to the connecting, adhering, bonding, attaching, sewing together, or the like, of two elements. Two elements will be considered to be joined together when they are integral with one another or joined directly to one another or indirectly to one another, such as when each is directly joined to intermediate elements.
The term “liquid impermeable,” when used in describing a layer or multi-layer laminate means that liquid, such as urine, menses or bowel movement, will not pass through the layer or laminate, under ordinary use conditions, in a direction generally perpendicular to the plane of the layer or laminate at the point of liquid contact.
The term “liquid permeable” refers to any material that is not liquid impermeable.
The terms “nonwoven” and “nonwoven web” refer to materials and webs of material having a structure of individual fibers or filaments which are interlaid, but not in an identifiable manner as in a knitted fabric. The terms “fiber” and “filament” are used herein interchangeably. Nonwoven fabrics or webs have been formed from many processes such as, for example, meltblowing processes, spunbonding processes, air laying processes, and bonded-carded-web processes. The basis weight of nonwoven fabrics is usually expressed in ounces of material per square yard (osy) or grams per square meter (gsm) and the fiber diameters are usually expressed in microns.
The term “urinary incontinence device” refers to a device which is inserted into the vagina to treat urinary incontinence.
The term “thermoplastic” describes a material that softens when exposed to heat and which substantially returns to a non-softened condition when cooled to room temperature.
The term “vaginal liquid” refers to aqueous liquids, including viscoelastic liquids, pertaining primarily to those liquids that are present in the vaginal canal, including water, sweat, urine, blood, menses and mucin.
These terms may be defined with additional language in the remaining portions of the specification.
Disposable urinary incontinence devices of this invention are useful in the control of stress induced urinary leakage. Such disposable urinary incontinence devices can have a liquid-stable resilient member, and can additionally include an improved cover sheet of the present invention, where the liquid-stable resilient member can be at least partially wrapped by the cover sheet.
The invention is suitable for many various disposable urinary incontinence devices, having many various shape profiles and configurations. For example, suitable shape profiles can include: tubular, “M”-shape, “W”-shape, spiral, molar, wishbone, “n”-shape, “u”-shape, “T”-shape, inverted “V”-shape, arrow, mushroom and the like. Exemplary urinary incontinence devices are described in U.S. Pat. No. 6,090,038 to Zunker et al, U.S. Pat. No. 6,090,098 to Zunker et al, U.S. Pat. No. 6,478,726 to Zunker, U.S. Pat. No. 6,676,594 to Zunker et al, U.S. Pat. No. 6,770,025 to Zunker et al, U.S. Pat. No. 6,679,831 to Zunker et al, U.S. Pat. No. 6,695,763 to Zunker et al, U.S. Pat. No. 6,808,485 to Zunker and U.S. Patent Application No. 2004/0078013 to Zunker et al., each of which is incorporated herein by reference in a manner that is consistent herewith. For exemplary purposes only (i.e., not limiting), a disposable urinary incontinence device having a W-shape profile.
To gain a better understanding of the present invention, attention is directed to
Referring to
The resilient member 120 can comprise natural or synthetic materials. Suitable natural materials include natural rubber and wool, for example. Suitable synthetic materials include polyolefins, polyethylene, polypropylene, polyester, polybutylene, polyurethane, latex, silicone elastomerics, polyethylene oxide (PEO), polyvinyl alcohol (PVA), rayon, spun cellulose, LYCRA, KEVLAR, carbon fibers and the like. LYCRA and KEVLAR are available from E.I. DuPont de Nemours & Company, having a place of business located in Wilmington, Del., U.S.A. One particular exemplary material suitable for constructing the resilient member includes CHISSO ESC bicomponent fiber (available from Chisso Corporation having a place of business located in New York, N.Y., U.S.A.) which consist of a polypropylene core surrounded by a polyethylene sheath. Other bicomponent fibers made from polypropylene, polyethylene, etc. are commercially available from suppliers such as Exxon and Dow Chemical, as well as from other vendors. Another particular exemplary material suitable for constructing the resilient member includes VOLARA, a polyethylene closed-cell foam available from Voltex, a Division of Sekisui America Corporation having a place of business located in Lawrence, Mass., U.S.A. Another particular exemplary material suitable for constructing the resilient member includes a surge material. Such surge material comprises a plurality of thermoplastic fibers that are heated to form a lofty nonwoven web. The surge material can have a basis weight of at least 85 grams per square meter, a void volume of between 20 and 50 cubic centimeters per gram of web while under a pressure of 3447 dynes per square centimeter (0.05 psi, 345 Pascal), a permeability of about 2,500 to 10,000 Darcy, a porosity (web openness) of at least 95%, a surface area per void of 25 to 60 square centimeters per cubic centimeter and a compression resilience in both the wet and dry state of at least about 60%. O Suitable surge materials include Textor Surge 4.25 and Textor Surge 5.25, available from Kimberly-Clark Corporation, having a place of business located in Neenah, Wis., U.S.A.
In some aspects, the resilient member can also be non-absorbent. As used herein, the term “non-absorbent” refers to a material that has a retention capacity of less than 0.3 grams water per gram material, such as less than 0.2 grams, or between 0.3 grams-0.05 grams, as measured by the Spinning Retention Capacity Test. In one example, Textor Surge 4.25 having a basis weight of 150 gsm had a retention capacity of 0.16 g/g, and in another example, Textor Surge 5.25 having a basis weight of 150 gsm had a retention capacity of 0.21 g/g, as measured by the Spinning Retention Capacity Test.
In some aspects, the resilient member can have a Resilient Compression value from about 60% to about 90%, and a Resilient Expansion of between 60% and 100%, as measured by the Resiliency Test. In one example, the Textor Surge 5.25 having a basis weight of 150 gsm from above had a Resilient Compression of 81% and a Resilient Expansion of 82%, as measured by the Resiliency Test.
The resilient member 120 desirably has substantially equivalent dry and wet expansion characteristics. In other words, the resilient member 120 should be made from a material that is capable of returning 220 back to at least about 60% of its original configuration in a dry state, a wet state or in a semi-dry-wet state, such as at least about 70%, or at least about 80% or more, such as 100%. Dry expansion of the urinary incontinence device 110 is beneficial in that the device does not have to be wetted by aqueous liquids, such as vaginal liquids, before the resilient member 120 is capable of expanding within the vagina, and further that the device 110 is not inhibited from returning to at least 60% of its original configuration when wetted by aqueous liquids.
In
In the illustrated embodiment, the resilient member 120 has a length L1 in the longitudinal direction 1, a width W1 in the transverse direction 2, and a height H1 in the z-direction 3. By way of example only, in some aspects, the length L1 can range from about 127 mm to about 254 mm, such as about 152 mm to about 229 mm, or about 178 mm to about 203 mm; the width W1 can range from about 76 mm to about 203 mm, such as about 102 mm to about 178 mm, or about 127 mm to about 152 mm; and the height H1 (as measured by the Thickness Test) can range from about 1 mm to about 20 mm, such as about 3 mm to about 10 mm, or about 5 mm to about 8 mm.
In some aspects, the resilient member 120 can be provided as a tubular structure 122 such as shown in
The disposable urinary incontinence device 110 of the present invention also includes an improved cover sheet 130 configured to partially or fully envelop the resilient member 120. The cover sheet 130 can be liquid-permeable or liquid-impermeable. For example, when the cover sheet is liquid-impermeable, it serves to block body fluids from contacting any materials disposed within the cover sheet 130. However, since the resilient member 120 is moisture-stable, it is not necessary that the cover sheet be liquid-impermeable. The cover sheet 130 provides a smooth outer surface which may or may not be chemically treated to facilitate insertion and/or removal into and out of a woman's vagina. Suitable cover sheet materials include polyolefins such as spunbonds and bonded-carded webs, polyesters, polyethylene, polypropylene, silicon, polystyrene, polyurethane and the like. In some desirable aspects, the cover sheet is a thermoplastic polymer film that is hydrophobic. One particularly suitable cover sheet 130 material is CDR-421034 Perforated Film, a 21 gsm polyethylene blend film that is single sided vacuum aperture (available from Texol s.r.l., having a place of business located in Alanno Scalo (PE), Italy). Another particularly suitable cover sheet 130 material is EX-1824027, a 24 gsm polyethylene blend film that is dual apertured (available from Texol s.r.l.). Yet another particularly suitable cover sheet 130 material is EM-5216067, a dimple-embossed film that has no apertures (available from Texol s.r.l.).
In some aspects, the surface of the cover sheet 130 can include apertures and/or can be embossed with grooves, dimples, dots and the like that can reduce the surface contact area when inserted into the vagina. One advantage of the disposable urinary incontinence device of the present invention is that the cover sheet 130 has a uniquely low surface contact area, which can reduce or eliminate irritation to the vaginal tissues, can reduce or eliminate the occurrence of the disposable urinary incontinence becoming un-removable by the user, and can provide a disposable urinary incontinence device which is easier for women to insert into and remove from their bodies, without the need for surface treatments, such as mineral oil for example. Accordingly, the device of the present invention includes a cover sheet that has a surface contact area at 10% depth measured from the outer surface (i.e., skin-facing surface) of 40% or less, preferably 30% or less, or less than 15%, or from 30% to 1%, as measured by the Surface Contact Area Test. For example, CDR-421034 Perforated Film having an average thickness of 441 μm provides a surface contact area at 10% depth of 30.0%; EX-1824027 having an average thickness of 928 μm provides a surface contact area at 10% depth of 1.7%; and EM-5216067 having an average thickness of 91 μm provides a surface contact area at 10% depth of 14.5%
Another advantage of the disposable urinary incontinence device of the present invention is that the cover sheet 130 has a uniquely low coefficient of friction, due in part to the combination of cover material chemistry and low surface contact area, which also contributes to reducing or eliminating irritation to the vaginal tissues, reducing or eliminating the occurrence of the disposable urinary incontinence becoming un-removable by the user, and providing a disposable urinary incontinence device which is easier for women to insert into and remove from their bodies, without the need for surface treatments, such as mineral oil for example. In some aspects, the cover material of the present invention desirably exhibits a static coefficient of friction (COF) that is less than 0.300, such as less than 0.250, or from 0.275 to 0.150, and a dynamic (kinetic) coefficient of friction that is less than 0.250, such as less than 0.225, or from 0.230 to 0.150 when measured in accordance with ASTM 1894-01 using 18-gauge type 31 stainless steel and taking the average of 5 samples. For example, CDR-421034 Perforated Film exhibited a static coefficient of friction of 0.186 and a dynamic coefficient of friction of 0.163, and EX-1824027 exhibited a static coefficient of friction of 0.244 and a dynamic coefficient of friction of 0.222.
In an alternative aspect, the cover material of the present invention can exhibit a static coefficient of friction that is less than 0.700, such as less than 0.650, or from 0.675 to 0.500, and a dynamic (kinetic) coefficient of friction that is less than 2.500, such as less than 2.200, or from 2.150 to 1.300 when tested in accordance with ASTM 1894-01 using 18-gauge type 31 stainless steel and additionally having a layer of the same cover sheet material (test side up) disposed on the testing surface of the 200 g sled, and taking the average of 5 samples. For example, CDR-421034 Perforated Film exhibited a static coefficient of friction of 0.664 and a dynamic coefficient of friction of 0.554, and EX-1824027 exhibited a static coefficient of friction of 2.125 and a dynamic coefficient of friction of 1.323.
In another alternative aspect, the cover material of the present invention can exhibit the following static coefficient of friction values, as measured by the Surrogate Skin Coefficient of Friction Test:
a static coefficient of friction from 550 to 150 at a sled weight of 1000 g;
a static coefficient of friction from 350 to 100 at a sled weight of 500 g; and
a static coefficient of friction from 250 to 50 at a sled weight of 300 g.
For example, CDR-421034 Perforated Film exhibited a static coefficient of friction of 224.4 (1000 g sled), 148.8 (500 g sled) and 97.6 (300 g sled); and EX-1824027 exhibited a static coefficient of friction of 499.1 (1000 g sled), 314.1 (500 g sled) and 221.2 (300 g sled).
In some aspects, the cover sheet can have stretch properties of Loading Energy, Unloading Energy and Hysteresis Loss, as measured by measured by the Multi-Cycle Stress/Strain Test. The cover sheet can have the following values:
cycle 1 MD Loading Energy from 6500 g-cm-7500 g-cm;
cycle 2 MD Loading Energy from 2500 g-cm-3500 g-cm;
cycle 1 CD Loading Energy from 2000 g-cm-4000 g-cm;
cycle 2 CD Loading Energy from 1000 g-cm-2000 g-cm;
cycle 1 MD Unloading Energy from 500 g-cm-1500 g-cm;
cycle 2 MD Unloading Energy from 1000 g-cm-1500 g-cm;
cycle 1 CD Unloading Energy from 250 g-cm-1000 g-cm;
cycle 2 CD Unloading Energy from 250 g-cm-1000 g-cm;
cycle 1 MD Hysteresis Loss from 80%-85%;
cycle 2 MD Hysteresis Loss from 55%-65%;
cycle 1 CD Hysteresis Loss from 75%-85%; and
cycle 2 CD Hysteresis Loss from 60%-70%.
In some aspects, the cover sheet 130 can have a desired flexibility, as measured by the KES Stiffness Test. For example, the cover sheet material can have a Bending Stiffness (B) from 0.005 gf cm2/cm to 0.030 gf cm2/cm and a Bending Hysteresis (2HB) from 0.010 gf cm/cm to 0.025 gf cm/cm. In one particular example, CDR-421034 Perforated Film exhibited a Bending Stiffness (B) of 0.011 gf cm2/cm and a Bending Hysteresis (2HB) from 0.015 gf cm/cm. In another particular example, EX-1824027 exhibited a Bending Stiffness (B) of 0.029 gf cm2/cm and a Bending Hysteresis (2HB) from 0.022 gf cm/cm
In aspects where the cover sheet 130 has a greater width than the resilient member 120, the greater dimension for the width W2 allows the cover sheet 130 to be folded over upon itself and be bonded to itself to form a longitudinal bond 132, such as shown in
In aspects where the cover sheet 130 has a greater length L3 than the resilient member 120, the greater dimension for the length L3 allows the cover sheet 130 to be to be sealed at the ends in a region that may or may not be devoid of resilient material to form an end seal 134 that is substantially free of resilient material, as shown in
In some aspects, the device 110 of the present invention can also include additional layers. For example,
The additional layers 122,124 can, although not necessarily, be sized and arranged to be substantially coextensive with the resilient member or with each other. As used herein, the phrase “substantially coextensive” means that the individual layers have either the same or about the same length and width dimensions; however, some minor dimensional variations may be present. For instance, the width of the layers may vary slightly so that when folded (e.g.,
In some aspects, the starting structure 100 is formed into an elongated member in the form of a softwind before shaping into a disposable urinary incontinence device 110 of the present invention. This can be accomplished by folding, rolling, and/or radially compressing the starting structure 100. For example,
In some aspects, the longitudinal end portions 135 of the cover sheet 130 of the elongated member 140 can be sealed to form end seals 134, such as shown in
In some aspects, the elongated member 120 can have compression properties. For example, the elongated member can have an Energy Loading from 20 gf to 80 gf. an Energy UnLoading from 20 gf to 50 gf. and a Hysteresis Loss from 40% to 50%, as measured by the Elongated Member Compression Test. The results for some exemplary tubular-shaped elongated member each having a diameter of approximately 20 mm and a length of approximately 175 mm comprising a resilient member consisting of Texor Surge 5.25 having a width of approximately 13 mm, a length of approximately 17 mm and a basis weight of approximately 150 gsm disposed within a CDR-421034 Perforated Film cover sheet can be seen in Table 1 below:
The elongated member 140 can be folded to form a disposable urinary incontinence device 110 of the present invention. For purposes of example only, the urinary incontinence device 110 of the invention has a “W-shaped” profile, such as shown in
In some desirable aspects, elongated portions 191 and 192 can be apertured to form a first opening (aperture) 54A and a second aperture 54B, respectively, which extend partially or completely through elongated portion 191 and elongated portion 192, such as shown in
In some aspects, the free ends 56A and 56B of the withdrawal member 56 can then be tied into a knot 58 to assure that the withdrawal member 56 will not separate from the device 110. The knot 58 can also serve to prevent fraying of the withdrawal member 56 and can provide a place or point where a woman can grasp the withdrawal member 56 when she is ready to remove the disposable urinary incontinence device 10 from her vagina.
In the illustrated embodiment, it should be noted that the withdrawal member 56 also holds the end portions 162A,164A in direct contact with one another and can limit the amount that the device 110 will expand (i.e., unfold) while positioned within the woman's vagina. In some aspects, the apertures 54A,54B can alternatively be formed in the elongated member 140 before it is folded, and the withdrawal member 56 can be attached either before or after the elongated member 140 is folded.
The withdrawal member 56 can be constructed from various types of strings, threads or ribbons that are well known in the art, such as cotton, nylon, polypropylene and the like. The withdrawal member 56 should have a length which extends beyond the withdrawal end 52 of the W-shaped urinary incontinence device 110 of from about 50 mm to about 200 mm, such as from about 75 mm to 150 mm, or from about 100 mm to about 130 mm. The withdrawal member 56 can be dyed and/or treated with an anti-wicking agent, such as wax, before being secured to its respective pledget. The anti-wicking agent can reduce and desirably prevent vaginal fluids from wicking along the withdrawal member 56 and contacting the inner surface of a woman's undergarment.
In desirable aspects, the elongated member 140 is folded a second time between the first end 162A and fold region 112 to form fold region 114, and the elongated member 130 is folded a third time between the second end 164A and fold region 112 to form fold region 116. Thus, the disposable urinary incontinence device 110 of the present invention will have three fold regions 112,114,116 which are located between the first and second ends 162A,162B of the elongated member 140, providing a first portion 193 (defined by end 162A and line 171), a second portion 194 (defined by end 164A and line 172), a third portion 195 (defined by line 171 and line 170) and a fourth portion 196 (defined by line 172 and line 170), such as shown in
As referenced above, the fold region 112 can be positioned an equal or an unequal distance between the first and second ends 162A,164A of the elongated member 140. When the fold region 112 is positioned an equal distance between the first and second ends 162A,164A, such as in the illustrated embodiment of
In some aspects, an embossment can be applied to the cover sheet 130 of the elongated member 140 at the point of each desired fold region to provide fold guides 550. The fold guides 550 encourage the elongated member 140 to be folded at predetermined points. Typically, the embossed fold guide 550 will accordingly have a higher density and stiffness than the remainder of the cover sheet 130; thus, the fold regions will often occur adjacent to the fold guides 550, rather than directly on the fold guides 550. In some aspects, the fold guides 550 are located on the skin-facing side of the pledget (although they need not be); thus, the fold guides 550 can desirably be gentle to the skin. The embossment of the fold guides 550 can have any desirable emboss pattern, such as slanted parallel lines or diamonds for example, and the emboss pattern can also be visually appealing.
The disposable urinary incontinence device 110 having a W-shaped profile of the illustrated example can have a Transverse Device Compression which is the compression force of the device 110 in the transverse 2 direction (i.e., the force exhibited as the device tends toward unfolding when being compressed), such as shown in
In general, the pledget 150 has an overall longitudinal 1 length L5, an overall transverse 2 width W5 and a depth D5 which runs along the z-axis 3, such as shown in
The pledget 150 also has a dimension R5 which is the distance between the apex of fold region 112 and the closest end 162A,164A of the elongation member 140. In the illustrated embodiment, the dimension R5 is equal in distance to between the apex of fold region 112 and the both ends 162A,164A, although it need not be. The dimension R5 can range from about 10 mm to about 100 mm, such as from about 20 mm to about 80 mm, or from about 35 mm to about 50 mm. Another way of stating the length of the dimension R5 is to say that it should have a distance which is equal to at least about 10-percent, such as at least about 25-percent, of the length L5 of the pledget 150. The distance R5 should desirably be sufficient to ensure that the pledget 150 has a less dense and more comfortable insertion end, and yet can laterally expand outward at the trailing end 52 to provide pressure against the interior walls of the vagina.
The insertion end 51 of the pledget 150 is designed to be the first end of the pledget 150 that enters into the woman's vaginal cavity during insertion. It should be noted that, while in use, the pledget 150 will be entirely positioned within the woman's vagina, such as seen in
The use of the device 110 is illustrated in
In
An additional aspect of this invention comprises a means of adjusting the width dimension W6 of the device 110 to increase the pressure against the vaginal walls, if necessary, by pulling on the withdrawal member 56 while an applicator 210 (
Another aspect of this invention comprises a means of adjusting the width dimension W6 (
Comparing the compressed pledget 150 shown in
The compressed pledget 150 can be housed in a nonwoven, cardboard, polymeric (e.g., plastic) and the like applicator to facilitate insertion of the urinary incontinence device 110 into a woman's vagina 92. In general, the applicator can be constructed of one or more hollow tubes which can retain the device 110 in the form of a compressed pledget 150 at a set length, width and/or diameter. Furthermore, insertion of the pledget 150 from the applicator into the human body can be accomplished by using a plunger 240, such as in a two-piece or three-piece applicator, or by digital insertion, whereby the user can use one of her fingers to insert the device 110 rather than an applicator. Suitable applicators are disclosed in U.S. Pat. No. 6,645,136 to Zunker et al., which is incorporated herein by reference in a manner that is consistent herewith.
For exemplary purposes only,
The barrel 220 includes a hollow cylinder 226 extending substantially parallel to a longitudinal axis 1 adapted to house and carry the compressed pledget 150 therein. In a direction substantially perpendicular to its longitudinal axis 1, the barrel 220 of the illustrated embodiment has a substantially oval or elliptical cross-section (although it need not be) defining a major axis 2 and a minor axis 3. The barrel 220 has a urinary incontinence device discharging exit end (i.e., insertion end) 270 and a trailing end 275. The insertion end 270 is the leading, vaginal insertion end when the applicator 210 is inserted into the vagina 92. The insertion end portion 270 of the cylinder 226 preferably includes flanges defining petals 224, which soften the vaginal insertion process. Accordingly, the petals 224 are desirably flexible, enabling the pledget 150 to be ejected therethrough when the plunger 240 is pressed against the trailing end 52 of the pledget 150 within the barrel 220. The illustrated embodiment comprises eight petals 224; however, any number of petals can be suitable, such as 1-10 petals, for example. Alternatively, in some aspects, the insertion end portion 270 may have 0 petals.
In some aspects, the barrel 220 can be tapered such that the insertion end 270 has a smaller cross-section diameter D8 than the trailing end 240 diameter D9, although it need not be. An exemplary tapered barrel can be seen in
The insertion end 280 of the gripping portion 230 attaches to the trailing end 275 of the barrel 220. In some aspects, the gripping portion 230 can include a mechanical snap 237 at the insertion end 280 that joins to a mating snap 227 at the trailing end 275 of the barrel 220 so that the barrel 220 and gripping portion 230 do not separate during use. In some additional aspects, the gripping portion 230 can include a slot 238 that can mate with a complementary tab 228 located on the trailing end 275 of the barrel 220 to prevent the barrel 220 and gripping portion 230 from turning relative to each other.
In some aspects, the trailing end 285 of the gripping portion 230 has a decreased or tapered width or diameter relative to the insertion end 280 of the gripping portion 230, which serves as a guide and/or an insertion stop for the plunger 240 at the head flange 242 when the plunger 240 is extended and/or at the rear flange 246 when the plunger 240 is depressed. In some aspects, the trailing end 285 of the gripping portion 230 can have one or more substantially flattened surfaces as compared to the insertion end 280 which can help hold and guide the plunger 240, and/or provide a surface for the user's fingers. Accordingly, in some aspects, the general cross-sectional configuration of the trailing end 285 of the gripping portion 230 is desirably similar or comparable to that of the shaft 244 of the plunger 240 to accommodate smooth axial engagement between the gripping portion 230 and the plunger 240. In some aspects, the gripping portion 230 can include a plurality of engaging portions 236 defined by extensions within the interior portion of the gripping portion 230 for contacting the exterior of the plunger 240 adapted to secure the plunger 240 in place and/or for guiding it during insertion or withdrawal of the applicator 210.
In some aspects, the gripping portion 230 can include a finger contour 232 designed to more comfortably fit the user's fingers. The finger contour 232 can assist the user when holding or inserting the applicator 210, and in some aspects, can assist the user with proper orientation of the applicator 210. In some further aspects, such as seen in
The plunger portion 240 of the applicator 210 in the illustrated embodiment includes a head flange portion 242, a shaft portion 244 and a rear flange portion 246. Like the trailing end 285 of the gripping portion 230, the plunger 240 can have a substantially rectangular or race-track (i.e. two flat sides and two curved sides) cross-section profile having a major axis 2 and a minor axis 3 in a direction perpendicular to its longitudinal axis 1. In some aspects, the corners and/or sides of the plunger 240 can have some radius of curvature, which can reduce frictional contact of the plunger 240 with the inner surfaces of the gripping portion 230, and can enhance the aesthetic appearance of the applicator 210. The plunger 240 is desirably hollow, and has exits 241 and 243 for threading the withdrawal member 56 through the interior of the plunger 240 and out the trailing end 295 of the plunger 240. The head flange portion 242 and rear flange portion 246 can be integrally formed with the shaft portion 244. The head flange portion 242 is located at the insertion end 290 of the plunger and can have a larger cross-section dimension than the shaft portion 244, such that it can more easily push the pledget 150 out of the barrel 220. The rear flange portion 246 is located at the trailing end 295 of the plunger 240 and can have a slightly larger cross-section dimension than the shaft portion, such that a user's finger can more easily engage the plunger 240 during insertion. In some aspects, the plunger 240 can be reinforced by support members integrally formed within the interior and/or on the exterior of the plunger 240.
The invention also includes a method of forming an elongation member 130 with a longitudinal exterior seam 132. With reference to
Step 1) A web of liquid-stable resilient member material 120′ is provided having a desired width and thickness.
Step 2) Optionally (not shown), one or more additional layers may be aligned on either surface of the resilient member 120.
Step 3) The resilient member material 120′ is formed into a tubular shape, such as by drawing it through a radially constricting device 318 resulting in a randomly folded tubular-shaped resilient member 120. A transverse cross-section view of member 120 is shown in
Step 4) The resilient member 120 can be optionally embossed to form fold regions. Locating the embossments 113 interior to the lateral edge of the resilient member 120 can reduce the possibility of irritation to the user of the end product.
Step 5) A cover sheet material 130′ of the present invention is provided.
Step 6) The resilient member 120 enters tube opening 320 and is drawn into tube 319 by applying a longitudinal 1 tension.
Step 7) The cover sheet material 130′ is wrapped around tube 319.
Step 8) The lateral ends of the material 130′ are attached using heat and pressure to form a cover sheet 130 having a longitudinal seam 132.
Step 9) The resilient member 120 and the cover sheet 130 exit tube 319 at opening 321. Desirably, tube opening 321 has a smaller diameter than tube opening 320.
Step 10) The resilient member 120 expands radially and fills the sealed cover sheet 130 forming a continuous elongation member 140′.
Step 11) The continuous elongation member 140′ is segmented (i.e., cut) into individual elongation members 140. Releasing the tension on the resilient member 120 by cutting the continuous elongation member 140′ results in a longitudinal 1 length reduction of the resilient member 120, resulting in an elongated member 140 that is devoid of resilient materials at the longitudinal ends 135.
Step 12) The longitudinal ends 135 of the elongation member 140 are sealed using heat and pressure to form end seals 134.
With reference to
Step 1) A web of liquid-stable resilient member material 120′ is provided having a desired width and thickness.
Step 2) Optionally (not shown), one or more additional layers may be aligned on either surface of the resilient member 120.
Step 3) The resilient member material 120′ is formed into a tubular shape, such as by drawing it through a radially constricting device 318 resulting in a continuous randomly folded tubular-shaped resilient member 120″.
Step 4) The continuous resilient member 120″ can be optionally embossed to form fold regions. Locating the embossments 113 interior to the lateral edge of the resilient member 120 can reduce the possibility of irritation to the user of the end product.
Step 5) The continuous resilient member 120″ is segmented (i.e., cut) into individual resilient members 120.
Step 6) A cover sheet material 130′ of the present invention is provided.
Step 7) The cover sheet material 130′ is wrapped snuggly around the individual resilient members 120. A gap 117 of predetermined length is maintained between successive resilient members 120.
Step 8) The lateral ends the cover sheet material 130′ are attached forming seam 132 resulting in a tubular-shaped cover sheet 130.
Step 9) The cover sheet 130 comprising individual resilient members 120 is sealed by heat and pressure at the location of the gap 117, and then segmented to form an elongated member 140 having longitudinal end seals 134.
The invention also provides a method for alleviating female urinary incontinence. The method comprises the steps of:
a) providing the disposable urinary incontinence device 110 of the present invention comprising a liquid-stable resilient member 120 and a cover sheet 130 of the present invention that envelops the liquid-stable resilient member 120 to form an elongated member 140 having a tubular profile, wherein the elongated member 140 has a first end 162A, a second end 164A, a first fold region 112 disposed between the first end 162A and the second end 164A, a second fold region 114 disposed between the first end 162A and the first fold region 112, a third fold region 116 disposed between the second end 164A and the first fold region 112;
b) folding the elongated member 140 at the first fold region 112, the second fold region 114 and the third fold region 116 to form a first portion 193 located between the first end 162A and the second fold region 114, a second portion 194 located between the second end 164A and the third fold region 116, a third portion 195 located between the first fold region 112 and a second fold region 114, and a fourth portion 196 located between the first fold region 112 and the third fold region 116 to provide an elongated member 140 is in a folded condition, wherein the first portion 193 is substantially aligned adjacent to the second portion 194, the first portion 193 is substantially aligned adjacent to the third portion 195, the second portion 194 is substantially aligned adjacent to the fourth portion 196, and the first portion 193 and the second portion 194 are disposed between and substantially adjacent to the third portion 195 and the fourth portion 196 to form a disposable urinary incontinence device 110 having a W-shaped profile;
c) compressing the disposable urinary incontinence device 110 having a W-shaped profile into a compressed pledget 150 having an insertion end 51 and a trailing end 52;
d) inserting the compressed pledget 150 into a woman's vagina 92 with the insertion end 51 entering first;
e) positioning the compressed pledget 150 within the vaginal cavity 92 at a location ranging from the urethral sphincter muscle 84 to the vaginal opening 91;
f) allowing the compressed pledget 150 to expand within the vaginal canal 92 to form an inserted disposable urinary incontinence device 110′ to provide pressure to the urethro-vaginal myofascial area 86; and
e) permitting the urethra 88 to be compressed upon itself thereby limiting involuntary urine flow.
In some aspects, the method further comprises attaching a withdrawal member 56 to the first portion 193 and the second portion 194 of the elongated member. In some aspects, the method further comprises inserting the compressed pledget 150 into an applicator 210. In some aspects, the method further comprises, gripping the applicator 210 at the gripping portion 230, inserting the insertion end 270 of the applicator 210 into the vagina 92 through the vaginal opening 91, and pushing the plunger 240 to eject the pledget 150 from the applicator 210. In some aspects, the method further comprises adjusting the pressure exerted by the device 210 by pulling on the withdrawal member while the applicator 210 is disposed in the vagina 92. In some aspects, the method further comprises removing the urinary incontinence device 110 from the vagina 92 by pulling on the withdrawal member 56.
It will be appreciated that details of the foregoing examples, given for purposes of illustration, are not to be construed as limiting the scope of this invention. Although only a few exemplary embodiments of this invention have been described in detail above, those skilled in the art will readily appreciate that many modifications are possible in the examples without materially departing from the novel teachings and advantages of this invention. For example, features described in relation to one example may be incorporated into any other example of the invention.
Accordingly, all such modifications are intended to be included within the scope of this invention, which is defined in the following claims and all equivalents thereto. Further, it is recognized that many embodiments may be conceived that do not achieve all of the advantages of some embodiments, particularly of the desirable embodiments, yet the absence of a particular advantage shall not be construed to necessarily mean that such an embodiment is outside the scope of the present invention. As various changes could be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description shall be interpreted as illustrative and not in a limiting sense.
