Intravascular catheter assembly

Claim 2

An intravascular catheter assembly which comprises a catheter tube having a leading end for insertion into a blood vessel and a rear end communicating with a flexible tube extending rearwardly 4 GB 2 044 107 A 4 from a barrel for the catheter to a tubular connector; a seal cap which is fitted to the connector and provides a passage forthe insertion of a cannula tube therethrough into the flexible tube and catheter tube; a withdrawable cannula having a cannula tube 70 inserted through and in sealing engagement with said passage and extending through the flexible tube and catheter tube with its leading end protrud ing beyond the leading end of the catheter tube, a tubular barrel at the rear end of the cannula tube, and a cannula-locating member projecting forwardly from the cannula barrel; and a stopper mounted externally on the barrel of the catheter and abutting againstthe leading end of the cannula-locating memberto restrict the extent of insertion of the cannular tube through the cathetertube.

Claim 3

An assembly according to claim 1 wherein the catheter tube is a double tube which has an inner axially extending chamber open at its leading end contiguous with an outer annular chamber closed at 85 its leading end, at least one small lateral hole extending through the outer wall of the annular chamber near its closed end, and the outer chamber communicating with a tube branching from the catheter barrel.

Claim 4

An assembly according to claim 1 or 2 wherein the catheter tube is transparent or translucent.

Claim 5

An assembly according to any of claims 1 to 3 wherein the flexible tube is transparent ortranslu cent.

Claim 6

An assembly according to any of claims 1 to 4 wherein the connector is transparent or translucent.

Claim 7

An assembly according to any of claims 1 to 5 wherein the tubular hub of the cannula is transpa rent or translucent.

Claim 8

An assembly according to any of claims 1 to 6 wherein the tubular hub of the cannula has a detachable cap provided with a filter.

Claim 9

An assembly according to any of claims 1 to 7 wherein the passage through the seal cap is wide at its rear end and tapers forwardly to a narrow portion for sealing engagement with the cannula tube extending therethrough.

Claim 10

An assembly according to any of claims 1 to 7 wherein the passage through the seal cap has a closure which is displaceable by insertion of a cannula tube or a terminal of a blood circulation passage but which in operation obstructs the flow of blood rearwardly through the seal cap or withdrawal of such cannula tube or terminal.

Claim 11

An assembly according to claim 8 wherein the seal cap is substantially-as hereinbefore de scribed with reference to Figure 5 or Figure 6.

Claim 12

An assembly according to claim 9 wherein the seal cap is substantially as hereinbefore de scribed with reference to Figures 7 and 8.

Claim 13

An assembly according to any of claims 1 to 11 including clamping means for constricting the flexible tube to close it.

Claim 14

An assembly according to claim 12 wherein the clamping means is substantially as hereinbefore described with reference to Figures 9 and 10 of the accompanying drawings.

Claim 15

An assembly according to claim 12 wherein the clamping means is substantially as hereinbefore described with reference to Figures 11 and 12 of the accompanying drawings.

Claim 16

An intravascular catheter assembly substantially as hereinbefore described with reference to Figures 1 to 4 of the accompanying drawings.

Claim 17

An intravascular catheter assembly substantially as hereinbefore described with reference to Figures 1 to 4 of the accompanying drawings.

Claim 18

A catheter suitable for use in an assembly according to any preceding claim.

Claim 19

Acannula suitable for use in an assembly according to any of claims 1 to 15.

Claim 20

An intravascular catheter assembly which comprises a catheter tube having a leading end for insertion in a blood vessel and a rear end communicating with a flexible catheter tube; a cannula which is detachably inserted into the axially extending hole, with the distal end of said cannula arranged to protrude from the distal end of the flexible catheter tube; a connector which is fitted to the proximal end of a hub of the catheter tube with a flexible tube interposed between said connector and catheter hub; a seal cap which is fitted around the connector, has an axially extending hole, and whose inner wall tightly abuts against the outer wall of the cannula when it passes through said axially extending hole; a cannula-locating bar, one end of which is fixed to the peripheral surface of the tubular hub of the cannula, and the other end of which projects toward the proximal end of the catheter; and a stopper which is mounted on the peripheral surface of the tubular hub of the catheterto abut againstthe distal end of the cannula-locating bar, thereby defining the extent to which the cannula is inserted into the catheter tube.

Claim 21

An intravascular catheter assembly which comprises a catheter tube having a leading end for insertion in a blood vessel and a rear end communicating with a flexible catheter tube; a cannula which is detachably inserted into the axially extending hole, with the distal end of said cannula arranged to protrude from the distal end of the flexible catheter tube; a connector which is fitted to the proximal end of a hub of the catheter tube with a flexible tube interposed between said connector and catheter hub; a seal cap which is fitted around the connector, has an axially extending hole, and whose inner wall tightly abuts against the outer wall of the cannula when it passes through said axially extending hole; a cannula-locating bar, one end of which is fixed to the peripheral surface of the tubular hub of the cannula, and the other end of which projects toward the proximal end of the catheter; and a stopper which is mounted on the peripheral surface of the tubular hub of the catheterto abut againstthe distal end of the cannula-locating bar, thereby defining the extent to which the cannula is inserted into the catheter tube.

Claim 22

The intravascular catheter assembly according to claim 18 wherein the flexible catheter tube is formed of a double tube which has an axially extending hole and an outer annular hole defined around said axially extending hole; the distal end of said outer annular hole is blocked; at least one small hole is formed in the blocked portion of the outer annular hole; and the proximal end of the outer annular hole communicates with a branch tube diverted from the peripheral surface of the tubular hub of the flexible catheter tube. 0 T 1 Printed for Her Majesty's Stationery Office by Croydon Printing Company Limited, Croydon Surrey, 1980. Published by the Patent Office, 25 Southampton Buildings, London, WC2A IAY, from which copies may be obtained. k