US5769828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stage venous cannula with expandable reinforcing member
Assignee: Medtronic Inc
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Filing: 1996-06-13
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Granted: 1998-06-23
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Expires: 2016-06-13
Abstract
Abstract A two-staged venous cannula is disclosed. The cannula includes an expandable reinforcing member around the atrial basket that prevents the cannula from kinking or collapsing in the area where the reinforcing member is applied. The reinforcing member preferably consists of an even number of rigid discrete beams of the same length equally spaced about the circumference of a cylinder. In an alternate embodiment, the beams may be equally spaced on the surface of a cone. Alternate spaces between the beams are formed. The alternate spaces between the beams are equally spaced around the circumference of the cannula. The alternate spaces between the beams remain equally spaced around the circumference of the cannula as the reinforcing member is expanded over a larger diameter. This design for the reinforcing member provides space between the beams where holes of the preferred shape, size and orientation can be placed through the cannula without requiring cutting through the material of the reinforcing member.
Inventors
- 👤 Kenneth R. Jonkman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:17
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0009; A61M25/0012; A61M1/00; A61M1/36; A61M1/3621; A61M1/3653; A61M1/3659; A61M25/0043; A61M25/005; A61M25/0052; A61M25/0067; A61M25/0068; A61M25/007; A61M25/0021; A61M25/0023; A61M25/0026; A61M25/003; A61M2025/0031; A61M25/0015; A61M25/008
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
164 words
A two-staged venous cannula comprising: an elongated tubular body having a distal end and a proximal end and an interior lumen extending from the distal end to the proximal end of the body, the interior lumen being open at the proximal end of the body and being substantially enclosed at the distal end of the body, the body having at least one first hole near the distal end of the body extending from the outside of the distal end of the body to the interior lumen, the first hole providing fluid communication between the interior lumen and the exterior of the cannula at the distal end of the body; and, an atrial basket having a reinforcing member formed therewith, the atrial basket located proximal to the distal end of the body, the reinforcing member having at least one space through which at least one second hole passes to allow blood outside of the cannula to pass through the second hole into the interior lumen.
Claim 2
Dependent Claim
164 words
A two-staged venous cannula comprising: an elongated tubular body having a distal end and a proximal end and an interior lumen extending from the distal end to the proximal end of the body, the interior lumen being open at the proximal end of the body and being substantially enclosed at the distal end of the body, the body having at least one first hole near the distal end of the body extending from the outside of the distal end of the body to the interior lumen, the first hole providing fluid communication between the interior lumen and the exterior of the cannula at the distal end of the body; and, an atrial basket having a reinforcing member formed therewith, the atrial basket located proximal to the distal end of the body, the reinforcing member having at least one space through which at least one second hole passes to allow blood outside of the cannula to pass through the second hole into the interior lumen.
Claim 3
Dependent Claim
15 words
The cannula of claim 1 wherein the reinforcing member includes an alternating series of beams.
Claim 4
Dependent Claim
15 words
The cannula of claim 2 wherein at least two beams are parallel to each other.
Claim 5
Dependent Claim
18 words
The cannula of claim 2 wherein each beam is connected to its neighbor beam by a connecting piece.
Claim 6
Dependent Claim
16 words
The cannula of claim 4 wherein each connecting piece is attached to only two neighboring beams.
Claim 7
Dependent Claim
47 words
The cannula of claim 4 wherein at least one connecting piece connects neighboring beams at a first end of the reinforcing member and at least one connecting piece connects neighboring beams at a second end of the reinforcing member opposite the first end of the reinforcing member.
Claim 8
Dependent Claim
20 words
The cannula of claim 6 wherein each connecting piece alternately connects neighboring beams at opposite ends of the reinforcing member.
Claim 9
Dependent Claim
21 words
The cannula of claim 4 wherein at least two connecting pieces are located at the same end of the reinforcing member.
Claim 10
Dependent Claim
19 words
The cannula of claim 8 wherein each connecting piece is located at the same end of the reinforcing member.
Claim 11
Dependent Claim
10 words
The cannula of claim 2 wherein there are two beams.
Claim 12
Dependent Claim
10 words
The cannula of claim 2 wherein there are four beams.
Claim 13
Dependent Claim
10 words
The cannula of claim 2 wherein there are six beams.
Claim 14
Dependent Claim
10 words
The cannula of claim 2 wherein there are eight beams.
Claim 15
Dependent Claim
14 words
The cannula of claim 1 wherein the reinforcing member is made of a polyolefin.
Claim 16
Dependent Claim
13 words
The cannula of claim 1 wherein the reinforcing member is made of polyetherimide.
Claim 17
Dependent Claim
13 words
The cannula of claim 1 wherein the reinforcing member is made of PVC.
Claim 18
Dependent Claim
13 words
The cannula of claim 1 wherein the reinforcing member is made of metal.
Claim 19
Dependent Claim
13 words
The cannula of claim 1 wherein the reinforcing member is circular in cross-section.
Claim 20
Dependent Claim
15 words
The cannula of claim 1 wherein the reinforcing member is integrally formed in the cannula.
Claim 21
Dependent Claim
11 words
The cannula of claim 1 wherein the first holes are elongated.
Claim 22
Dependent Claim
28 words
The cannula of claim 20 wherein the elongated first holes have the axis of elongation aligned with lines that are parallel to the elongated axis of the body.
Claim 23
Dependent Claim
25 words
The cannula of claim 1 wherein the first holes are equally spaced around the outer of the cannula at the distal end of the body.
Claim 24
Dependent Claim
28 words
The cannula of claim 1 wherein the first holes are placed in several rows, each row spaced a different distance from the ultimate distal end of the body.
Claim 25
Dependent Claim
41 words
The cannula of claim 23 where in the first holes are located around the outer surface of the distal end of the body in rows so that the first holes in one row are offset the first holes in another row.
Claim 26
Dependent Claim
20 words
The cannula of claim 1 wherein the distal tip has a narrower outer diameter than the rest of the cannula.
Claim 27
Dependent Claim
14 words
The cannula of claim 1 wherein the distal tip of the cannula is rounded.
Claim 28
Dependent Claim
34 words
The cannula of claim 1 further comprising a first spring added to the cannula near the distal end of the body to make the distal end of the cannula more rigid and kink resistant.
Claim 29
Dependent Claim
13 words
The cannula of claim 27 wherein the first spring is a helical wire.
Claim 30
Dependent Claim
15 words
The cannula of claim 27 wherein the first spring is integrally formed in the cannula.
Claim 31
Dependent Claim
34 words
The cannula of claim 1 further comprising a stiffening layer added to the cannula near the distal end of the cannula to make the distal end of the cannula more rigid and kink resistant.
Claim 32
Dependent Claim
23 words
The cannula of claim 1 wherein the second holes are equally spaced around the outer circumference of the cannula at the atrial basket.
Claim 33
Dependent Claim
11 words
The cannula of claim 1 wherein the second holes are elongated.
Claim 34
Dependent Claim
19 words
The cannula of claim 32 wherein the second holes are elongated in the direction of elongation of the cannula.
Claim 35
Dependent Claim
33 words
The cannula of claim 1 further comprising a second spring added to the cannula proximal to the atrial basket to make the cannula proximal to the atrial basket more rigid and kink resistant.
Claim 36
Dependent Claim
13 words
The cannula of claim 34 wherein the second spring is a helical wire.
Claim 37
Dependent Claim
24 words
The cannula of claim 34 wherein the second spring is integrally formed in and extends proximally from the proximal end of the atrial basket.
Claim 38
Dependent Claim
33 words
The cannula of claim 1 further comprising a stiffening layer added to the cannula proximal to the atrial basket to make the cannula proximal to the atrial basket more rigid and kink resistant.
Claim 39
Dependent Claim
47 words
The cannula of claim 1 wherein the reinforcing member includes a molded cylindrical tube through which at least one space is formed, through which at least one second hole passes to allow blood outside of the cannula to pass through the second hole into the interior lumen.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-06-22 | 2001-12-22 | 2002-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-22 | 2005-12-22 | 2006-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-22 | 2009-12-22 | 2010-06-23 | $7700.00 | Window Closed / Lapsed |