# US 5,346,287 A · Low contamination swab employing tubular knit fabric

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- Number: US 5,346,287 A
- Document ID: US5346287A
- Status: Granted
- Kind: A
- Application number: 08/069,880
- Filed: 1993-05-28
- Granted: 1994-09-13
- Earliest claimed: 1991-05-07
- Assignees: The Morgan Crucible Company plc
- Inventors: Simon W. Burrow; David P. Nobile
- Web page: https://patentgrep.com/patent/US5346287A

## CPC

- A47L 13/16: Cloths; Pads; Sponges (metal scraping sponges A47L13/07)
- A47L 13/46: Securing scouring or polishing cloths or sponges to the handles by gripping means, tongs, or the like
- A61F 13/38: Swabs having a stick-type handle {, e.g. cotton tips} (A61M35/006 takes precedence)
- B08B 1/145: {Swabs}
- A47L: DOMESTIC WASHING OR CLEANING (brushes A46B; cleaning quantities of bottles or of other hollow articles of one kind B08B9/00; laundry D06F); SUCTION CLEANERS IN GENERAL (cleaning in general B08)
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- B08B: CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL

## Abstract

A swab having an absorbent end comprising a material strip of tubular knit fabric wrapped with a first blind end, helically to a tip and reverse helically to a termination point distal from the tip provides low contamination for use in clean room processes. Lost fibers or lint are precluded by the trapped fiber edges of the material strip forming the absorbent tip of the swab while burying of the first end of the material strip in the blind wrap and combined sealing, severing, and adhering of the second end of the material strip to complete the swab distal from the tip, further precludes fiber contamination.

## Claims

### Claim 1

A method for manufacturing a low contamination swab having a handle and a material strip of knitted fabric with trapped fiber edges, the method comprising the steps of:
placing a first end of the material strip of knitted fabric adjacent the handle,
wrapping the material strip of knitted fabric over the first end,
helically wrapping the material strip of knitted fabric past an end of the handle to a tip,
wrapping the material strip of knitted fabric in a reverse helix from the tip to a termination point distal the end of the handle,
severing the material strip of knitted fabric to form a second end, and
adhering the second end at the termination point.

### Claim 2

A method for manufacturing a low contamination swab having a handle and a material strip with trapped fiber edges, the method comprising the initial step of sealing a first end of the material strip and comprising the subsequent steps of:
placing the first end of the material strip adjacent the handle,
wrapping the material strip over the first end,
helically wrapping the material strip past an end of the handle to a tip,
wrapping the material strip in a reverse helix from the tip to a termination point distal the end of the handle,
severing the material strip to form a second end, and
adhering the second end at the termination point.

### Claim 3

A method for manufacturing a low contamination swab having a handle and a material strip with trapped fiber edges, the method comprising the steps of:
placing the first end of the material strip adjacent the handle,
wrapping the material strip over the first end,
helically wrapping the material strip past an end of the handle to a tip,
wrapping the material strip in a reverse helix from the tip to a termination point distal the end of the handle,
severing the material strip to form a second end, and
sealing the second end of the material strip prior to adhering the second end to the handle at the termination point.

### Claim 4 (depends on 3)

A method as described in claim 3 further comprising the step of sealing the first end of the material strip prior to placing it adjacent the handle.

### Claim 5

A method for manufacturing a low contamination swab having a handle and a material strip with trapped fiber edges, the method comprising the steps of:
placing a first end of the material strip adjacent the handle,
wrapping the material strip over the first end,
helically wrapping the material strip past an end of the handle to a tip,
wrapping the material strip in a reverse helix from the tip to a termination point distal the end of the handle,
applying a hot knife to the material strip at the termination point to sever, seal and adhere the material strip.

### Claim 6 (depends on 5)

A method as described in claim 5 employed for sequential fabrication of swabs wherein the application of the hot knife to severe, seal, and adhere the material strip, seals the first end of the material strip for fabrication of a subsequent swab.

### Claim 7

A method for manufacturing a low contamination swab comprising a handle having an end and a tubular knit material strip having first and second ends, comprising the steps of:
a. placing the first end of the tubular knit material strip adjacent the handle at a first location distal the end of the handle;
b. wrapping the tubular knit material strip over the first end;
c. helically wrapping the tubular knit material strip along at least a portion of the handle to a second location;
d. wrapping the tubular knit material strip in a reverse helix from the first location to a termination location distal the end of the handle;
e. severing the tubular knit material strip to form the second end; and
f. adhering the second end at the termination location.

### Claim 8 (depends on 7)

A method according to claim 7 further comprising the step of sealing the first end of the tubular knit material.

### Claim 9 (depends on 7)

A method according to claim 7 in which the adhering step comprises adhering the second end to the handle at the termination location.

### Claim 10 (depends on 9)

A method according to claim 9 further comprising the step of sealing the first end of the tubular knit material and in which the first location and the termination location are identical.