# US 7,744,567 B2 · Reducing withdrawal force in a safety IV catheter

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- Number: US 7,744,567 B2
- Document ID: US7744567B2
- Status: Granted
- Kind: B2
- Application number: 11/943,341
- Filed: 2007-11-20
- Published: 2009-07-16
- Granted: 2010-06-29
- Earliest claimed: 2006-11-22
- Assignees: Becton, Dickinson and Company
- Inventors: Kristoffer Glowacki; Johan Fredrik Thörne; Lars-Åke Lennart Larsson; Jörgen Bruno Hager
- Web page: https://patentgrep.com/patent/US7744567B2

## CPC

- A61M 25/0637: {Butterfly or winged devices, e.g. for facilitating handling or for attachment to the skin}
- A61M 25/0625: {with a permanent connection to the needle hub, e.g. a guiding rail, a locking mechanism or a guard advancement mechanism}
- A61M 5/3275: {being connected to the needle hub or syringe by radially deflectable members, e.g. longitudinal slats, cords or bands}
- A61M 25/0618: {having means for protecting only the distal tip of the needle, e.g. a needle guard}
- A61M 2005/325: {Means obstructing the needle passage at distal end of a needle protection sleeve}
- Y10T 29/49826: Assembling or joining
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An extravascular system for accessing the vasculature of a patient may include a catheter adapter, a needle, and/or a needle tip shield assembly. The needle tip shield assembly may have a needle cap, and the needle cap may have a needle shield and at least one low friction surface. The needle may be disposed within the catheter assembly and the needle tip shield assembly. The low friction surface may reside between the needle shield and the needle. The at least one low friction surface may reside on the needle, on the V-clip, and/or on a structure located between the needle and the V-clip.

## Claims

### Claim 1

An extravascular system for accessing the vasculature of a patient, comprising:
a catheter assembly;
a needle; and
a needle tip shield assembly having a needle cap, the needle cap having a V-clip needle shield wherein the V-clip includes a first arm and a second arm joined by an elbow, and a structure having at least one low friction surface;
wherein the needle is disposed within the catheter assembly and the needle tip shield assembly; and
wherein the structure having the low friction surface resides between the needle shield and the needle and wherein the withdrawal force of the needle is reduced by the structure.

### Claim 2 (depends on 1)

The system of claim 1, wherein the structure is secured to the needle cap.

### Claim 3 (depends on 1)

The system of claim 1, wherein the structure is integral to the needle cap.

### Claim 4 (depends on 1)

The system of claim 1, wherein the structure includes a fin.

### Claim 5 (depends on 1)

The system of claim 1, wherein the at least one low friction surface further comprises a lubricant.

### Claim 6 (depends on 1)

The system of claim 1, wherein the at least one low friction surface includes a polymer.

### Claim 7 (depends on 1)

The system of claim 1, wherein the at least one low friction surface is adhered to an adjoining structure.

### Claim 8 (depends on 1)

The system of claim 1, wherein the at least one low friction surface includes a surface with smooth edges.

### Claim 9

A method of manufacturing an extravascular system for accessing the vasculature of a patient, comprising:
providing a catheter assembly;
providing a needle;
disposing the needle at least partially within the catheter assembly;
providing a needle tip shield assembly having a needle cap, the needle cap having a needle shield;
disposing the needle at least partially within the needle cap;
preparing a structure having at least one low friction surface disposed between the needle shield and the needle such that the withdrawal force of the needle is reduced by the structure; and
further comprising forming the needle shield as a V-clip having a first arm joined to a second arm by means of an elbow.

### Claim 10 (depends on 9)

The method of claim 9, further comprising decreasing the withdrawal force and friction of the needle as it is drawn past the needle shield.

### Claim 11

An extravascular system for accessing the vasculature of a patient, comprising:
a catheter assembly means;
a needle means; and
a needle tip shield assembly means having a needle cap means, the needle cap means having a means for shielding a needle, said means for shielding a needle comprising a V-clip including a first arm and a second arm joined by an elbow and means for providing low friction;
wherein the needle means is disposed within the catheter assembly means and the needle tip shield assembly means; and
wherein the means for providing low friction comprises a structure residing between the means for shielding a needle and the needle means wherein the withdrawal force of the needle is reduced by the structure.