EP0352928A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
I.V. catheter with self-locating needle guard
Assignee: Smiths Medical ASD Inc
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Filing: 1989-07-10
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Granted: —
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Expires: 2009-07-10
Abstract
Abstract An I.V. catheter is described, including a catheter and hub assembly (15, 16, 18) and a needle and hub assembly (12, 20). A needle guard (30), including a tubular distal portion (32) and a split proximal flange (34), is located about the needle (12) at the distal end of the needle hub (20). The needle (12) includes a slot (50) near the needle tip. As the needle assembly (12, 20) is withdrawn from the catheter (15), the needle guard (30) slides along the needle (12) until the split flange (34) engages the needle slot (50), which locks the tubular distal portion (32) of the guard (30) over the needle tip.
Inventors
- 👤 Francis P. Lemieux
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 17:27
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/32; A61M25/00; A61M25/01; A61M25/06; A61M25/0612; A61M25/0618; A61M25/0606; A61M5/14; A61M5/158; A61M5/3205; A61M5/321; A61M5/3243; A61M5/3273
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
122 words
An I.V. catheter with a self-locking needle guard comprising: a catheter assembly including a catheter attached to a hollow catheter hub; an introducer needle assembly, including a hollow needle with a distal tip, said needle being affixed near its proximal end to a needle hub, the distal end of said needle hub being suitable for engaging said hollow catheter hub, and said needle including means for engaging a needle guard; and a needle guard suitable for confinement within said hollow catheter hub, said needle guard including a proximal portion having means for engaging said engaging means of said needle and a distal portion for extending over said needle tip when said proximal portion is engaged with said engaging means of said needle.
Claim 2
Dependent Claim
122 words
An I.V. catheter with a self-locking needle guard comprising: a catheter assembly including a catheter attached to a hollow catheter hub; an introducer needle assembly, including a hollow needle with a distal tip, said needle being affixed near its proximal end to a needle hub, the distal end of said needle hub being suitable for engaging said hollow catheter hub, and said needle including means for engaging a needle guard; and a needle guard suitable for confinement within said hollow catheter hub, said needle guard including a proximal portion having means for engaging said engaging means of said needle and a distal portion for extending over said needle tip when said proximal portion is engaged with said engaging means of said needle.
Claim 3
Dependent Claim
25 words
The I.V. catheter of Claim 1, wherein said engaging means of said needle comprises an engagement slot located near said distal tip of said needle.
Claim 4
Dependent Claim
31 words
The I.V. catheter of Claim 2, wherein said distal portion of said needle guard comprises a cylindrical portion having an inner diameter slightly larger than the outer diameter of said needle.
Claim 5
Dependent Claim
43 words
The I.V. catheter of Claim 3, wherein said proximal portion of said needle guard comprises a flange having a central aperture aligned with said distal cylindrical portion, and said needle guard engaging means includes an axially aligned expansion slot passing through said flange.
Claim 6
Dependent Claim
31 words
The I.V. catheter of Claim 4, wherein said needle guard becomes locked in engagement with said needle when the rim of said flange aperture engages said engagement slot of said needle.
Claim 7
Dependent Claim
44 words
The I.V. catheter of Claim 4, wherein the diameter of said flange aperture is less than the outer diameter of said needle, whereby said needle spreads said flange about said expansion slot when the full diameter of said needle passes through said flange aperture.
Claim 8
Dependent Claim
36 words
The I.V. catheter of Claim 1, wherein said needle guard further includes means for retaining said needle guard within said catheter hub prior to engagement of said needle engaging means and said needle guard engaging means.
Claim 9
Dependent Claim
65 words
The I.V. catheter of Claim 7, wherein said proximal portion of said needle guard comprises a radially extending flange having a central aperture, and said retaining means includes an axially aligned expansion slot passing through said flange, whereby said flange is brought into contact with said catheter hub when said expansion slot opens in response to the passage of said needle through said central aperture.
Claim 10
Dependent Claim
84 words
An I.V. catheter which enable the rapid detection of blood in the cannula comprising: a catheter assembly including a catheter attached to a hollow catheter hub; an introducer needle assembly, including a cannula with a distal tip which extends from the distal end of said catheter, said cannula including a slot located in a wall thereof for passage of blood to the region between said cannula and said catheter, whereby the presence of blood may be visually detected between said cannula and said catheter.
Claim 11
Dependent Claim
84 words
An I.V. catheter which enable the rapid detection of blood in the cannula comprising: a catheter assembly including a catheter attached to a hollow catheter hub; an introducer needle assembly, including a cannula with a distal tip which extends from the distal end of said catheter, said cannula including a slot located in a wall thereof for passage of blood to the region between said cannula and said catheter, whereby the presence of blood may be visually detected between said cannula and said catheter.
Claim 12
Dependent Claim
17 words
The I.V. catheter of Claim 9, wherein said catheter is made of a transparent or translucent material.
Claim 13
Dependent Claim
111 words
An I.V. catheter with a self-locking needle guard comprising: a catheter assembly including a catheter attached to a catheter hub; an introducer needle assembly, including a hollow needle with a distal tip, said needle being affixed near its proximal end to a needle hub, and said needle including means for engaging a needle guard; and a needle guard, initially located about said needle at the distal end of said needle hub, said needle guard including a proximal portion having means for engaging said engaging means of said needle and a distal portion for extending over said needle tip when said proximal portion is engaged with said engaging means of said needle.
Claim 14
Dependent Claim
111 words
An I.V. catheter with a self-locking needle guard comprising: a catheter assembly including a catheter attached to a catheter hub; an introducer needle assembly, including a hollow needle with a distal tip, said needle being affixed near its proximal end to a needle hub, and said needle including means for engaging a needle guard; and a needle guard, initially located about said needle at the distal end of said needle hub, said needle guard including a proximal portion having means for engaging said engaging means of said needle and a distal portion for extending over said needle tip when said proximal portion is engaged with said engaging means of said needle.
References Cited (Backward Citations)
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