AU2002340255A1 - Knitted casting gloves - Google Patents

Description

WO 03/045174 PCT/USO2/33248 KNITTED CASTING GLOVES RELATED APPLICATIONS [0001] This application claims priority of U.S. provisional patent application No. 60/332,157, entitled KNITTED CASTING GLOVES, filed 21 November 2001, and U.S. non-provisional patent application No. 10/152,293, filed 21 May 2002, entitled KNITTED CASTING GLOVES, by Gerber et al., herein incorporated by reference in its entirety. FIELD OF THE INVENTION [0002] The present invention relates to knitted casting gloves used for any molding or modeling application where a slippery, non-stick glove is beneficial to the user. More specifically, it relates to gloves used as casting gloves by physicians and technicians in setting broken limbs. BACKGROUND OF THE INVENTION [0003] Casts used by physicians to set broken limbs typically are bandages made of plaster, polyester or fiberglass applied on the fabric of the bandage or orthopedic casting tape. The cast must be applied to the broken limnb by hand and generally requires dipping the bandage in water or some other curing agent prior to wrapping the cast in place on the limb. As the bandages are being set on the limb, the curing or drying process is underway and the bandage materials may become tacky. The physician's hands may begin to adhere to the cast before the cast is completely finished. [0004] To prevent the physician's hands from adhering to the tape or bandage material a lubricant is applied to the physician's hands or gloves to allow the gloves to slip over the curing tape or bandage material until the physician is prepared to terminate the cast. Methods for delivering the lubricant to the gloves have included providing a dry coating to the gloves that will become lubricious when brought into contact with water. Gloves having lubricant impregnated substrates have also been used. The gloves are typically latex with a lubricating polyvinyl alcohol (PVA) external coating. The PVA may be thickened with rhamsan gum, for example. The external coating is applied to the glove by dipping the glove in a solution of the lubricant, followed by drying the lubricant. The drawback to these types of gloves is that they may be difficult to manufacture reproducibly. The gloves also may be stiff, subject to cracking, or flaking off of particles. Also, the user is left with little manual control should the user need to manipulate small items such as a pen or scissors while using the gloves. 1 WO 03/045174 PCT/US02/33248 [0005] Additional methods of delivering the lubricant to gloves include the application of a casting cream consisting of water, mineral oil, sorbitol and silicon to the gloves after wrapping the cast but before molding the cast. However, incorporating oil-containing lubricants into curable compositions may result in a longer setting time for the cast. [0006] Another method for controlling the amount and location of the lubricant involves swabbing a lubricant onto the glove with a porous, flexible substrate as an applicator. The lubricant-impregnated porous substrate may be used to deliver the lubricant as needed to gloves or other surfaces that contact a tacky substance. One or both of the lubricated substrate or gloves may be wetted with water or immersed in water before swabbing the lubricant onto the glove. The substrate may be a knitted or woven textile or fabric including cotton. The drawbacks to using the substrate as an applicator of the lubricant is that multiple applications of the lubricant to the glove may be required during casting and added steps are required for lubricant delivery as compared to the gloves having a lubricating layer. The multiple applications and added steps are undesirable as they increase the time required to complete the casting procedure. [0007] Accordingly, there is a need for a glove that imparts a detackifying effect on the sticky surface of casting materials that does not increase the application time or cure time of the casting process. There is also a need for a casting glove that allows some tactile manipulation of small items such as pens and scissors. SUMMARY OF THE INVENTION [0008] The present invention is a knitted glove for use in setting casts on broken limbs or for use in handling any tacky molding or modeling activities such as ceramic molding or where a slippery non-stick glove is beneficial. When wetted, the glove imparts a detackifying effect on the sticky material. This glove eliminates stiffness, cracking, and flaking off of particles, and increases longevity of the gloves during use. The glove is designed to, optionally, be worn over a standard exam-type glove and is made from a water soluble, water-swellable polymer or fiber. The glove will swell, soften or at least partially dissolve into a slippery lubricious surface when wetted. The knitted glove may be made of polyvinyl alcohol ("PVA"), Co-Nylon, or low dissolving point polymer, or a blend of any of these materials, for example. 2 WO 03/045174 PCT/USO2/33248 DETAILED DESCRIPTION OF THE INVENTION [0009] The invention provides gloves of various knitted materials that impart a detackifying effect on a sticky work surface. These gloves include gloves made from materials further identified in Table 1 below. Table 1. Summary of Materials Use in Casting Gloves. Material Details Characteristics Cotton-PVA 30 51:49 Cotton: PVA 30/1 Water soluble PVA/Cotton Blend Cotton-PVA 40 51:49 Cotton: PVA 40/1 260 dn Water soluble PVA/Cotton Blend PVA #1 500 dn Dissolving point approx. 180°F PVA #12 500 dn Dissolving point approx. 85 0 F Co-nylon 700 dn Water soluble nylon Isolyser 380 dn Water soluble PVA yam Nylon 2/70 Nylon 150 dn Base material Polyester/Cotton 22/1 Polyester/Cotton Base material [0010] In Table 1, the abbreviation "dn"' refers to the denier of the corresponding fiber. Cotton-PVA 30 refers to the size yarn, i.e. size 30 and, similarly, Cotton-PVA 40 refers to size 40 yarn. PVA 30/1 refers to size 30 single ply yarn. In a similar fashion, PVA 40/1 refers to size 40 single ply yarn. The Cotton-PVA 30 and Cotton-PVA 40 materials were obtained from Itochu in Osaka, Japan. Isolyser materials are available from Orex Technologies of Norcross, Georgia. The PVA #1, PVA #12 and Co-nylon materials were obt gained from Fiber Science, Inc. in Pahn Bay, Florida. [0011] The dissolving points of the PVA #1 and PVA #12 materials is determined by the manufacturer by measuring a length of yarn and tying a washer weighing between 5 and 10 grams to one end of the length of yarn. The yarn and washer are then submersed in a vessel of water such that the washer does not rest on the bottom of the vessel of water. The water is then slowly heated until the yarn breaks and the washer falls to the bottom of the vessel. The dissolving point is reported to be the temperature at which the yarn breaks and the washer falls to the bottom of the vessel. [0012] Base material refers to the material being blended with a PVA material such that a spool of the material is knitted together with a spool of PVA material. Another method of combining materials is known as upwinding. During upwinding, strands of different materials are wound together to produce a single yarn of more than one material. 3 WO 03/045174 PCT/US02/33248 [0013] Test gloves were knitted on one of two different knitting machines. One machine was a 15-gauge knitting machine and the other was a 13-gauge 83 needle machine. Twelve types of gloves were produced for use in a sample casting procedure. The gloves are identified as samples A - L. Table 2 summarizes the test materials of each sample glove A L. Table 2. Materials of Sample Gloves A-L. Material Cotton- Cotton- PVA #1 Nylon Polyester/ Isolyser PVA 30 PVA 40 Cotton Cotton-PVA 30 B J G, I Cotton-PVA 40 A C PVA #1 H L Nylon D Polyester/ F E Cotton ISOLYSER K [0014] In Table 2 above, the data means the particular gloves are a blend of materials as indicated by the glove's position in the table. For example, Glove J is a blend of nylon and Cotton-PVA 30 from two spools knitted together. [0015] The gloves were subjectively analyzed for donning, wearability/comfort and casting durability properties. The gloves were placed over standard examination gloves when determining testing. Powder-free nitrile and polyvinyl chloride examination gloves were used as representative examination gloves. The results of this analysis are summarized in Table 3. 4 WO 03/045174 PCT/USO2/33248 Table 3. Summary of Donning and Durability Properties of Sample Gloves A-L. Glove Specifications Dry Glove Properties A 15-gauge, 2-end, size 9 Soft, flexible, easy to don B 15-gauge, 1-end (open weave), size 9 Soft, flexible, easy to don C 15-gauge, size 9 Heavier than A and B, fairly soft D 15-gauge, size 9 Heavy, boardy, less stretch E 15-gauge, size 9 Very stiff and heavy F 15-gauge, size 9 Somewhat stiff, tight feeling G 15-gauge, 7 courses of elastic in cuff, size Same as C, comfortable 9, weight is 14.2 grams H 15-gauge, size 9 Satiny, soft, fairly heavy I 13-gauge, 14 courses of elastic in cuff, Similar to G, stretchier, easier size 9, weight is 13.3 grams to don J 13-gauge, 1-end, Cotton-PVA, 2-end Soft, flexible, stretchy nylon, size 9 K 13-gauge, 1-end, size 9 Very soft, flexible, stretchy L 13-gauge, 1-end, size 9 Silky soft, has acetic odor [0016] The glove materials imparted various properties to the gloves when the gloves were wetted. Table 4 summarized the particular properties imparted to the gloves from the various materials evaluated. Table 4. Summary of Properties Imparted to Wetted Gloves. Material Characteristics Properties Imparted to Glove Cotton-PVA 30 Water soluble PVA/Cotton Rapid and near complete Blend dissolution, minor shrinkage, moderate slip. Cotton-PVA 40 Water soluble PVA/Cotton Rapid and near complete Blend dissolution, minor shrinkage, moderate slip. PVA #1 Dissolving point approx. Gloves exhibit slight dissolution 180OF (matrix remains intact), severe shrinkage, excellent slip. PVA #12 *Dissolving point approx. Gloves exhibit slight dissolution 85 0 F (matrix remains intact), severe shrinkage, excellent slip. Co-nylon Water soluble nylon Rapid dissolution resulting in a slippery, slimy gel. Isolyser Water soluble yarn Minimal dissolution at room temperature, glove matrix does not stick to the cast, minor shrinkage. *PVA having a dissolving point of at least 55 0 F is expected to perform similarly. 5 WO 03/045174 PCT/USO2/33248 [0017] To test the performance of each glove, the gloves were used in a simulated casting procedure. The simulated casting procedure consisted of the following steps: 1. Optionally donning an examination glove prior to donning a casting glove. 2. Donning the casting glove. 3. Immersing the gloved hands and a roll of casting material in room-temperature water. 4. Wrapping the casting material around a mandrel to form a cast of at least 12 inches. 5. Smoothing the edges of the cast by stroking 30 times in a back and forth motion. 6. Repeat steps 3-5 with additional rolls of casting tape. finished. [0018] The casting procedures were conducted using Delta-Cast Polyester Tapes from DePuy Orthopedics of Raynham, Massachusetts. The goal of the procedure was to cast two rolls of casting tape using a single pair of knitted casting gloves. The casting performance of each glove is sununmmarized in Table 5. Table 5. Summary of Casting Performance of Gloves A-L. ID Casting Performance A Dissolves fairly quickly, leaves slime around the cuff. Cast 1+ tapes. Performed better on nitrile gloves than on PVC gloves. B Dissolves fairly quickly, split apart, left slime on the cuff. Imparts minimum lubricity, messy. C Slight shrinkage, not extremely slippery, but does slide on the cast. D Lots of shrinkage, very slippery. Excellent casting performance, completed 2 tapes and could have done more. E Glove stretches a great deal when wet, very slippery / too slimy. Cast feels slimy when done. F Stretches a lot when wet. Casting is slippery but excess fabric from stretching balls up and catches. G Similar to C, a little slipperier and more shrinkage. Excellent longevity-120 strokes, at least 4 casts. Does not allow edges to be smoothed efficiently. Cuff shrank to heel of hand and occasionally grabbed. H Excellent casting, good at smoothing edges. Severe shrinkage resulting in restrictive fit during use. Casts 2 tapes maximum. Strong odor, leaves cast slimy. I Casting equivalent to that of G with better wet shrinkage. Longer cuff may have helped minimize shrinkage. J Not slippery enough, picked up cast color. K Baggy when wet, doesn't shrink. Can cast, but has some friction. L Severe shrinkage, very slippery. Casting is great. Could oversize gloves to offset shrinkage. 100% Co- Glove dissolves rapidly leaving a slippery gel. Casts 2 rolls. nylon 6 WO 03/045174 PCT/USO2/33248 [0019] Based on the described analysis and results, the best performing gloves were gloves that were partially soluble, but maintained integrity during casting. The casting process was less messy if the gloves were partially as opposed to completely soluble. Glove sample "I" gave the best overall performance. Glove I imparted enough slip during the casting process, yet retained a degree of friction required to grip and handle other objects such as pen and scissors. The glove had the benefit of added durability as they survived the casting of a number of tapes. [0020] It should be understood that various changes and modifications to the embodiments described herein will be apparent to those skilled in the art. Such changes and modifications can be made without departing from the spirit and scope of the present invention and without demising the attendant advantages. It is, therefore, intended that such changes and modifications be covered by the appended claims. 7

Claims (16)

1. A casting glove, comprising a knitted yarn, the knitted yarn is a base material and a water-soluble material.

2. The glove of claim 1, wherein said water-soluble material is a low dissolving point polymer.

3. The glove of claim 2, wherein the low dissolving point polymer has a dissolving point of at least 55 0 F.

4. The glove of claim 1, wherein said water-soluble material is polyvinyl alcohol (PVA).

5. The glove of claim 1, wherein said water-soluble material is water soluble nylon.

6. The glove of claim 1, wherein the base material is a cellulose-based fiber.

7. The glove of claim 6, wherein the cellulose-based fiber is cotton.

8. The glove of claim 1, wherein said base material is combination of polyester and cotton.

9. The glove of claim 1, wherein said base material is nylon.

10. The glove of claim 1, wherein said water-soluble material is Isolyser.

11. A casting glove comprising a knitted yarn, the knitted yarn is a base material and a water-swellable material.

12. A casting glove comprising a blend of a plurality of yarns wherein one of the plurality of yarns has a dissolving point.

13. The glove of claim 12, wherein the one of the plurality of yarns having a dissolving point is selected from a group consisting of polyvinyl alcohol, nylon, Isolyser, and combinations thereof.

14. The glove of claim 12, wherein said casting glove comprises a blend of a plurality of yarns knitted together.

15. A method for imparting slip to a stick sticky work surface, comprising the steps of: donning glove of knitted yarn; wetting the glove; and applying the wetted glove onto the sticky work surface.

16. A method for imparting slip to a sticky work surface, comprising the steps of: donning glove of knitted yarn; wetting the glove; and dissolving the yarn of the glove onto the sticky work surface. 8