Circulatory support system
Mechanical circulatory support systems that employ a connector cable for transmitting power and data are disclosed. A mechanical circulatory support system includes a ventricular cuff, a ventricular assist device, an external module, and a connector cable. The ventricular cuff is configured for attachment to a heart. The ventricular assist device is configured for attachment to the ventricular cuff and includes a housing, a rotor, a stator assembly, and control electronics. The external module includes an internal battery and is configured to power and control operation of the mechanical circulatory support system. Power and data are transmitted from the external module to the ventricular assist device over the connector cable. The connector cable includes two redundant pairs of electrical conductors.
1 . A mechanical circulatory support system comprising:
a ventricular cuff configured for attachment to a heart of a user;
a ventricular assist device configured for attachment to the ventricular cuff, wherein the ventricular assist device comprises a housing, a rotor, a stator assembly, and control electronics, wherein the housing defines an inlet opening and an outlet opening, wherein the housing comprises a dividing wall that delineates an inner volume that fluidly connects the inlet opening and the outlet opening, wherein the rotor is disposed within the inner volume and comprises one or more permanent magnets and centrifugal impeller blades, wherein each of the one or more permanent magnets comprises a permanent north pole and a permanent south pole, wherein the centrifugal impeller blades are configured to pump blood from the inlet opening to the outlet opening during rotation of the rotor within the inner volume, wherein the rotor and the inner volume are sized for complete magnetic levitation of the rotor within the inner volume so that blood flows through a secondary blood flow path between the rotor and the dividing wall having a secondary blood flow path gap in a range from 0.2 mm to 2.0 mm, wherein the stator assembly comprises drive coils and levitation coils, wherein the drive coils are arranged radially relative to the rotor, wherein the drive coils are operable to electromagnetically drive rotation of the rotor within the inner volume, wherein the levitation coils are arranged radially relative to the rotor, wherein the levitation coils are operable to electromagnetically levitate the rotor to control a radial position of the rotor within the inner volume, and wherein the control electronics are disposed within the housing and configured to control electrical supply to the drive coils and the levitation coils;
an external module comprising an internal battery, wherein the external module is configured to power and control operation of the mechanical circulatory support system; and
a connector cable over which power and data is transmitted from the external module to the ventricular assist device, wherein the connector cable comprises two redundant pairs of electrical conductors.
2 . The mechanical circulatory support system of claim 1 , wherein the data comprises a connection signal indicative of connection of the connector cable with an input connector operatively coupled with the ventricular assist device.
3 . The mechanical circulatory support system of claim 1 , wherein the two redundant pairs of electrical conductors consist of two power conductors and two ground conductors.
4 . The mechanical circulatory support system of claim 3 , wherein the two pairs of redundant electrical conductors are arranged in a linear array within the connector cable so that the connector cable has an elongated cross section.
5 . The mechanical circulatory support system of claim 4 , wherein:
the connector cable comprises a connector cable output connector;
the connector cable output connector comprises two power connectors, two ground connectors, and a data connector; and
the two power connectors and the two ground connectors are arranged symmetrically on opposite sides of the data connector to enable coupling of the connector cable output connector to an input connector in each of two opposite orientations.
6 . The mechanical circulatory support system of claim 5 , wherein the connector cable comprises an optical fiber connected to the data connector.
7 . The mechanical circulatory support system of claim 1 , further comprising an input connector, and wherein:
the connector cable comprises a connector cable output connector;
the connector cable output connector comprises four connectors;
the four connectors of the connector cable output connector comprise spring-loaded metal pins;
the input connector comprises metal plates; and
each of the metal plates is engaged by a respective one of the spring-loaded metal pins.
8 . The mechanical circulatory support system of claim 1 , further comprising an input connector, and wherein:
the connector cable comprises a connector cable output connector;
the connector cable output connector comprises a latching mechanism configured to physically attach the connector cable output connector to the input connector.
9 . The mechanical circulatory support system of claim 8 , wherein:
the latching mechanism comprises two latching arms; and
each of the latching arms comprises a dimple of a complementary shape and size to a respective recess on a surface of the ventricular assist device.
10 . The mechanical circulatory support system of claim 8 , wherein the latching mechanism comprises a first magnetic element configured to latch to a second magnetic element mounted to the ventricular assist device.
11 . The mechanical circulatory support system of claim 10 , wherein the first magnetic element is configured to unlatch from the second magnetic element upon application of a particular breakaway force.
12 . The mechanical circulatory support system of claim 1 , wherein the external module comprises an external module input connector configured to receive electrical power from a battery module and/or a charging unit.
13 . The mechanical circulatory support system of claim 12 , further comprising a battery module connector cable connected with the battery module and the external module input connector.
14 . The mechanical circulatory support system of claim 13 , wherein:
the battery module comprises a battery module output connector; and
the battery module connector cable comprises a battery module connector cable input connector that is couplable with the battery module output connector and decouplable from the battery module output connector.
15 . The mechanical circulatory support system of claim 1 , wherein the external module is configured to control distribution of electrical power received by the external module to simultaneously charge the internal battery and output electrical power to the ventricular assist device.
16 . The mechanical circulatory support system of claim 1 , wherein:
the housing has a puck-shaped portion and an inlet-cannula portion that extends from the puck-shaped portion; and
the puck-shaped portion has a width to thickness ratio in a range from 1.1 to 5.
17 . The mechanical circulatory support system of claim 1 , wherein the one or more permanent magnets provide a passive magnetic attractive force between the rotor and the stator assembly that resists movement of the rotor along an axis of rotation of the rotor.
18 . A mechanical circulatory support system comprising:
a ventricular cuff configured for attachment to a heart of a user;
a ventricular assist device configured for attachment to the ventricular cuff, wherein the ventricular assist device comprises a housing, a rotor, a stator assembly, and control electronics, wherein the housing defines an inlet opening and an outlet opening, wherein the housing comprises a dividing wall that delineates an inner volume that fluidly connects the inlet opening and the outlet opening, wherein the rotor is disposed within the inner volume and comprises one or more permanent magnets and centrifugal impeller blades, wherein each of the one or more permanent magnets comprises a permanent north pole and a permanent south pole, wherein the centrifugal impeller blades are configured to pump blood from the inlet opening to the outlet opening during rotation of the rotor within the inner volume, wherein the rotor and the inner volume are sized for complete magnetic levitation of the rotor within the inner volume so that blood flows through a secondary blood flow path between the rotor and the dividing wall having a secondary blood flow path gap in a range from 0.2 mm to 2.0 mm, wherein the stator assembly comprises drive coils and levitation coils, wherein the drive coils are arranged radially relative to the rotor, wherein the drive coils are operable to electromagnetically drive rotation of the rotor within the inner volume, wherein the levitation coils are arranged radially relative to the rotor, wherein the levitation coils are operable to electromagnetically levitate the rotor to control a radial position of the rotor within the inner volume, and wherein the control electronics are disposed within the housing and configured to control electrical supply to the drive coils and the levitation coils;
a ventricular assist device input connector operatively coupled with the ventricular assist device;
an external module comprising one or more battery cells; and
a connector cable configured to operatively couple the external module to the ventricular assist device input connector, wherein the connector cable comprises a connector cable output connector and at least four connectors configured to transfer power from the one or more battery cells of the external module to the ventricular assist device input connector for powering the ventricular assist device and to transfer data between the ventricular assist device and the external module.
19 . The mechanical circulatory support system of claim 18 , wherein the data comprises a connection signal indicative of connection of the connector cable with the ventricular assist device input connector.
20 . The mechanical circulatory support system of claim 18 , wherein the at least four connectors comprise two power conductors and two ground conductors.
21 . The mechanical circulatory support system of claim 20 , wherein the two power conductors and the two ground conductors are arranged in a linear array within the connector cable so that the connector cable has an elongated cross section.
22 . The mechanical circulatory support system of claim 18 , wherein:
the connector cable output connector comprises two power connectors, two ground connectors, and a data connector; and
the two power connectors and the two ground connectors are arranged symmetrically on opposite sides of the data connector to enable coupling of the connector cable output connector to the ventricular assist device input connector in each of two opposite orientations.
23 . The mechanical circulatory support system of claim 22 , wherein the at least four connectors comprise an optical fiber connected to the data connector.
24 . The mechanical circulatory support system of claim 18 , wherein:
the connector cable output connector comprises spring-loaded metal pins;
the ventricular assist device input connector comprises metal plates; and
each of the metal plates is engaged by a respective one of the spring-loaded metal pins.
25 . The mechanical circulatory support system of claim 18 , wherein the connector cable output connector comprises a latching mechanism configured to physically attach the connector cable output connector to the ventricular assist device input connector.
26 . The mechanical circulatory support system of claim 25 , wherein:
the latching mechanism comprises two latching arms; and
each of the latching arms comprises a dimple of a complementary shape and size to a respective recess on a surface of the ventricular assist device.
27 . The mechanical circulatory support system of claim 25 , wherein the latching mechanism comprises a first magnetic element configured to latch to a second magnetic element mounted to the ventricular assist device.
28 . The mechanical circulatory support system of claim 27 , wherein the first magnetic element is configured to unlatch from the second magnetic element upon application of a particular breakaway force.
29 . The mechanical circulatory support system of claim 18 , wherein:
the housing has a puck-shaped portion and an inlet-cannula portion that extends from the puck-shaped portion; and
the puck-shaped portion has a width to thickness ratio in a range from 1.1 to 5.
30 . The mechanical circulatory support system of claim 18 , wherein the one or more permanent magnets provide a passive magnetic attractive force between the rotor and the stator assembly that resists movement of the rotor along an axis of rotation of the rotor.