Intravascular pump

• US 7,027,875 B2
• Filed: 11/16/2001
• Issued: 04/11/2006
• Est. Priority Date: 12/01/2000
• Status: Expired due to Term

• Current Assignee: Impella Cardiosystems Gmbh
• Original Assignee: Impella Cardiosystems AG
• Inventors: Siess, Thorsten, Doepper, Gerhard
• Primary Examiner(s): MANUEL, GEORGE C
• Application Number:
  US10/432,478
• Publication Number:
  US 20040044266A1
• Time in Patent Office: 1,607 Days
• Field of Search: 607/116, 607/119, 604/8, 604/9, 604/151, 604/19
• US Class Current: 607/116
• CPC Class Codes: A61M 2025/0081 Soft tip
• CPC Class Codes: A61M 25/0068 Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure
• CPC Class Codes: A61M 25/007 Side holes, e.g. their profiles or arrangements; Provisions to keep side holes unblocked
• CPC Class Codes: A61M 25/0662 Guide tubes
• CPC Class Codes: A61M 25/0668 splittable, tear apart
• CPC Class Codes: A61M 60/135 inside a blood vessel, e.g. using grafting
• CPC Class Codes: A61M 60/148 in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
• CPC Class Codes: A61M 60/216 including a rotating member acting on the blood, e.g. impeller
• CPC Class Codes: A61M 60/237 the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps
• CPC Class Codes: A61M 60/857 Implantable blood tubes
• CPC Class Codes: A61M 60/865 Devices for guiding or inserting pumps or pumping devices into the patient's body

Abstract

The pump (10) comprises a drive portion (11) and a pump portion (12) which have such a small diameter that they can be pushed through a blood vessel (31). The pump portion (12) has a flexible cannula (18) connected thereto. In order to reduce the flow resistance of the cannula (18), the cannula (18) can be dilated to a diameter that is larger than that of the drive portion (11) and the pump portion (12), respectively. To be able to introduce the pump into the body by puncturing the blood vessel (31) according to the Seldinger technique, the cannula (18) is set into the constricted state in which it has a small diameter. In the blood vessel (31), it is dilated so that it offers a small flow resistance to the blood to be pumped there.

Claims

1. An intravascular pump, comprising:

a drive portion containing an electric motor;

a pump portion connected to said drive portion, said pump portion having an axial opening; and

a cannula projecting distally from said pump portion and being in fluid connection with said axial opening of the pump portion, said cannula comprising an expandable hose adapted to assume a first state with a relatively small diameter and a second state with a relatively large diameter.

2. The pump of claim 1, wherein said cannula is contained in a tubular coating in a constricted state and upon removal of said coating, assumes a dilated state while dilating elastically.

3. The pump of claim 1, wherein said cannula includes a rigid head piece.

4. The pump of claim 1, wherein said drive portion and said pump portion have longitudinally extending channel for a guide wire formed therein.

5. The pump of claim 1, wherein said cannula is radially elastic.

6. The pump of claim 5, wherein said cannula has a rigidity that increases proximally.

7. An intravascular pump, comprising:

a drive portion;

a pump portion connected to said drive portion; and

a cannula projecting from said pump portion comprising an expandable hose adapted to assume a first state with a relatively small diameter and a second state with a relatively large diameter, wherein said cannula comprises a material with shape memory which assumes the first state at a low temperature and assumes the second state at higher temperature.

8. An intravascular pump, comprising:

a drive portion;

a pump portion connected to said drive portion; and

a cannula projecting from said pump portion comprising an expandable hose adapted to assume a first state with a relatively small diameter and a second state with a relatively large diameter, wherein said cannula is contained in a tubular coating in a constricted state and upon removal of said coating, assumes a dilated state while dilating elastically, and wherein said coating includes longitudinally extending fissures to enable said coating to be torn into two separate sheets.

9. The pump of claim 8, wherein said sluice includes a seal that engages said cannula.

10. An intravascular pump, comprising:

a drive portion;

a pump portion connected to said drive portion; and

a cannula projecting from said pump portion comprising an expandable hose adapted to assume a first state with a relatively small diameter and a second state with a relatively large diameter; and

a tubular sluice through which said cannula is advanceable in its first state.

11. The pump of claim 10, wherein said head piece has an opening formed therein for passage of a guide wire therethrough.