Methods of Transferring Power to an Implanted Medical Device Employing a Prosthetic Rib Segment

Abstract

A method of transferring electrical power to a medical device implanted in a patient includes supporting a prosthetic rib segment via a rib of the patient. A percutaneous electrical connector is supported via the prosthetic rib segment so as to expose a connection port of the electrical connector via a skin aperture through a skin portion of the patient. Electrical power is transferred to the medical device via an external power cable connected to the connection port and an implanted power cable connected with the percutaneous electrical connector.

Claims

1. A method of transferring electrical power from an external power source to a medical device implanted in a patient, the method comprising: supporting a prosthetic rib assembly via a rib of the patient, wherein the prosthetic rib assembly comprises a prosthetic rib segment mounted to the rib and occupying a volume that was occupied by a resected segment of the rib; supporting a percutaneous electrical connector via the prosthetic rib segment so as to expose a connection port of the percutaneous electrical connector via a skin aperture through a skin portion of the patient, the percutaneous electrical connector being mounted to the prosthetic rib segment; interfacing a skin interface portion of the percutaneous electrical connector and an edge of the skin aperture; and transferring electrical power from the external power source to the medical device via an external power cable connected to the connection port and an implanted power cable connected with the percutaneous electrical connector.

2. The method of claim 1, wherein the percutaneous electrical connector is demountable from the prosthetic rib segment to enable mounting of a replacement percutaneous electrical connector to the prosthetic rib segment.

3. The method of claim 1, wherein the prosthetic rib assembly is reconfigurable to adjust a distance from the prosthetic rib segment to the skin interface portion to enable placement of the skin interface portion based on a location of the edge of the skin aperture.

4. The method of claim 3, wherein the prosthetic rib assembly comprises a replaceable fixed length portion that can be replaced with a replacement fixed length portion having a different length than the replaceable fixed length portion to adjust the distance from the prosthetic rib segment to the skin interface portion.

5. The method of claim 3, wherein the prosthetic rib assembly is configured to accommodate installation and/or removal of one or more spacers to adjust the distance from the prosthetic rib segment to the skin interface portion.

6. The method of claim 1, wherein the connection port is substantially flush with an exterior surface of the skin portion of the patient when the skin interface portion is interfaced with the edge of the skin aperture.

7. The method of claim 1, wherein the connection port is disposed proud of an exterior surface of the skin portion of the patient when the skin interface portion is interfaced with the edge of the skin aperture.

8. The method of claim 1, wherein the connection port is oriented substantially parallel to the skin portion of the patient when the skin interface portion is interfaced with the edge of the skin aperture.

9. The method of claim 1, wherein the skin interface portion of the percutaneous electrical connector includes a circumferential recess.

10. The method of claim 1, further comprising mounting a water-proof cap to the percutaneous electrical connector to shield the connection port from moisture ingression during showering or bathing by the patient.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1 is an illustration of a mechanical circulatory support system, which includes a prosthetic rib assembly, implanted in a patient's body, in accordance with many embodiments.

[0020] FIG. 2 is an illustration of the prosthetic rib assembly that includes a percutaneous electrical connector, in accordance with many embodiments.

[0021] FIG. 3 illustrates the prosthetic rib assembly of FIG. 2 implanted in a patient's body.

[0022] FIG. 4 is an illustration of a prosthetic rib assembly, which includes a percutaneous electrical connector and can be configured to account for patient to patient variation in rib to skin distance, in accordance with many embodiments.

[0023] FIG. 5 is an illustration of another prosthetic rib assembly, which includes a percutaneous electrical connector and can be adjusted to account for patient to patient variation in rib to skin distance, in accordance with many embodiments.

[0024] FIG. 6 is a simplified block diagram of acts of a method for transferring power from an external power source to an implanted medical device via a rib-mounted prosthetic rib assembly that includes a percutaneous electrical connector, in accordance with many embodiments.

DETAILED DESCRIPTION

[0025] In the following description, various embodiments of the present invention will be described. For purposes of explanation, specific configurations and details are set forth in order to provide a thorough understanding of the embodiments. However, it will also be apparent to one skilled in the art that the present invention may be practiced without the specific details. Furthermore, well-known features may be omitted or simplified in order not to obscure the embodiment being described.

[0026] Referring now to the drawings, in which like reference numerals represent like parts throughout the several views, FIG. 1 is an illustration of a mechanical circulatory support system 10 implanted in a patient 12. The mechanical circulatory support system 10 includes an implantable blood pump assembly 14, a ventricular cuff 16, an outflow cannula 18, an external system controller 20, power sources 22, an external drive line 24, a prosthetic rib assembly 26, and an implanted drive line 28. The implantable blood pump assembly 14 can include a VAD that is attached to an apex of the left ventricle, as illustrated, or the right ventricle, or both ventricles of the heart 30. The VAD can include a centrifugal pump (as shown) that is capable of pumping the entire output delivered to the left ventricle from the pulmonary circulation (i.e., up to 10 liters per minute). Related blood pumps applicable to the present invention are described in greater detail below and in U.S. Pat. Nos. 5,695,471, 6,071,093, 6,116,862, 6,186,665, 6,234,772, 6,264,635, 6,688,861, 7,699,586, 7,976,271, 7,997,854, 8,007,254, 8,152,493, 8,652,024, and 8,668,473 and U.S. Patent Publication Nos. 2007/0078293, 2008/0021394, 2009/0203957, 2012/0046514, 2012/0095281, 2013/0096364, 2013/0170970, 2013/0121821, and 2013/0225909, all of which are incorporated herein by reference for all purposes in their entirety. The blood pump assembly 14 can be attached to the heart 30 via the ventricular cuff 16, which can be sewn to the heart 30 and coupled to the blood pump 14. The other end of the blood pump 14 connects to the ascending aorta via the outflow cannula 18 so that the VAD effectively diverts blood from the weakened ventricle and propels it to the aorta for circulation through the rest of the patient's vascular system.

[0027] FIG. 1 illustrates the mechanical circulatory support system 10 during battery 22 powered operation. The blood pump 14 is operatively connected with the external controller 20 and the batteries 22 via the external drive line 24, the prosthetic rib assembly 26, and the implanted drive line 28. As described in more detail herein, the prosthetic rib assembly 26 is attached to a rib of the patient 12 in place of a resected segment of the rib. The prosthetic rib assembly 26 includes a percutaneous electrical connector that is connected with the implanted drive line 28 and connectable with the external drive line 24 for the transfer of electrical power and/or one or more control signals from any suitable external source (e.g., the battery 22, the external system controller 20) to the blood pump 14. The percutaneous electrical connector of the prosthetic rib assembly 26 extends through an aperture in the patient's skin. The external system controller 20 monitors operation of the mechanical circulatory support system 10. Related controller systems applicable to the present invention are described in greater detail below and in U.S. Pat. Nos. 5,888,242, 6,991,595, 8,323,174, 8,449,444, 8,506,471, 8,597,350, and 8,657,733, EP 1812094, and U.S. Patent Publication Nos. 2005/0071001 and 2013/0314047, all of which are incorporated herein by reference for all purposes in their entirety. The system 10 can be powered by either one, two, or more batteries 22.

[0028] The mechanical circulatory support system 10 can also include an internal controller assembly and one or more internal rechargeable power storage devices that are configured and operatively coupled between the prosthetic rib assembly 26 and the blood pump 14 via the implanted drive line 28 to enable untethered operation of the system 10. For example, the mechanical circulatory support system 10 can include an internal controller as assembly described in U.S. Pat. No. 8,562,508, all of which is incorporated herein by reference for all purposes in their entirety.

[0029] FIG. 2 illustrate an embodiment of the prosthetic rib assembly 26. In the illustrated embodiment, the prosthetic rib assembly 26 includes a prosthetic rib segment 32 and a percutaneous electrical connector 34 attached or mounted to the prosthetic rib segment 32. In many embodiments, the prosthetic rib segment 32 is configured to be mounted in place of a resected section of the patient's rib. In the illustrated embodiment, the prosthetic rib segment 32 includes mounting studs 36 extending from opposite ends of the prosthetic rib segment 32. The mounting studs 36 are coaxial with a mounting stud axis 38 and extend in opposite directions. The mounting studs 36 include self-tapping threads with one reverse-direction thread so that the prosthetic rib assembly 26 can be mounted in place of a resected rib segment via rotation of the prosthetic rib assembly 26 around the mounting stud axis 38 to screw the mounting studs 36 into the exposed rib ends resulting from the resection of the rib segment.

[0030] In many embodiments, the percutaneous electrical connector 34 is connectable with each of the external drive line 24 and the implanted drive line 28 to operatively couple conductors of the external drive line 24 with respective conductors of the implanted drive line 28. Accordingly, the prosthetic rib assembly 26 can be separately rotated around the mounting stud axis 28 to screw the mounting studs into the exposed rib ends with the implanted drive line 28 disconnected and the implanted drive line 28 connected to the percutaneous electrical connector 34 after the prosthetic rib assembly 26 is mounted to the exposed rib ends. FIG. 3 illustrates the prosthetic rib assembly of FIG. 2 implanted in a patient's body. The external drive line 24 can then be selectively coupled with the electrical connector 34 and selectively decoupled from the electrical connector 34.

[0031] FIG. 4 shows a cross-sectional view of an embodiment of the prosthetic rib assembly 26 in an implanted state and connected with the implanted drive line 28. In the illustrated embodiment, the prosthetic rib assembly 26 includes the prosthetic rib segment 32, the transcutaneous electrical connector 34, and a coupling element 40. The electrical connector 34 is accommodated within a recess in the prosthetic rib segment 32. The coupling element 40 is configured for use in securing the electrical connector 34 to the prosthetic rib segment 32. In the illustrated embodiment, the coupling element 40 includes female threads 42 that engage male threads 44 included the prosthetic rib segment 32. The coupling element 40 engages a shoulder 46 of the electrical connector 34 thereby securing the electrical connector 34 to the prosthetic rib segment 32. Any suitable approach can be used to mount the electrical connector 34 to the prosthetic rib segment 32.

[0032] In the illustrated embodiment, the electrical connector 34 includes a circumferential recessed skin interface portion 48 that is configured to interface with the edge of an aperture through the skin 50 of the patient 12. The edge of the aperture through the skin 50 extends into the recessed skin interface portion 48 thereby helping to inhibit relative movement between the interfacing aperture of the skin 50 and the recessed skin interface portion 48.

[0033] In many embodiments, the prosthetic rib assembly 26 is configurable to have a rib to skin offset distance 52 suitable for a particular patient 12. For example, in the embodiment illustrated in FIG. 4, the electrical connector 34 can be selected from a series of electrical connectors 34, each having a different length 54, to produce a desired rib to skin offset distance 52. The ability to vary the rib to skin offset distance 52 provides the ability to accommodate patient to patient variability with respect to distance between the rib of the patient 12 and the skin 50 as well as variability in the implanted location of the prosthetic rib segment 32 relative to the rib of the patient 12. As another example, in the embodiment illustrated in FIG. 5, the thickness of a shim(s) 56 can be adjusted to produce a desired rib to skin offset distance 52.

[0034] In many embodiments, the prosthetic rib assembly 26 includes a water-proof cap 58 for inhibiting and ideally preventing ingress of water into the electrical connector 34 when coupled with the electrical connector 34. For example, the water-proof cap 58 can be coupled with the electrical connector 34 during a period of untethered operation. For example, the external drive line 24 can be decoupled from the electrical connector 34 and the water-proof cap 58 configured to be mounted to the electrical connector 34 and shield a connection port of the electrical connector 34 from moisture ingression during showing or bathing by the patient.

[0035] FIG. 6 is a simplified block diagram of acts of a method 100 for transferring power from an external power source to an implanted medical device via a rib-mounted prosthetic rib assembly that includes a percutaneous electrical connector, in accordance with many embodiments. Any suitable rib-mounted prosthetic rib assembly, such as the prosthetic rib assembly 26 embodiments described herein, can be used to practice the method 100.

[0036] The method 100 includes supporting a prosthetic rib segment via a rib of a patient (act 102). In many embodiments of the method 100, the prosthetic rib segment is mounted to the patient's rib and occupies a volume that was occupied by a resected segment of the patient's rib.

[0037] The method 100 includes supporting a percutaneous electrical connector via the prosthetic rib segment so as to expose a connection port of the electrical connector via an aperture through a skin portion of the patient (act 104). In many embodiments of the method 100, the percutaneous electrical connector is mounted to the prosthetic rib segment.

[0038] The method 100 includes interfacing a skin interface portion of the percutaneous electrical connector and an edge of the aperture (act 106). In many embodiments of the method 100, interfacing the skin interface portion of the electrical connector and the edge of the aperture in the skin inhibits relative movement between the patient's skin and the electrical connector, thereby helping to inhibit the development of infection induced via relative movement between the skin and the electrical connector.

[0039] The method 100 includes transferring electrical power from the external power source to the medical device via an external power cable connected to the connection port and an implanted power cable connected with the percutaneous electrical connector (act 108). In many embodiments of the method 100, the external power cable can be selectively coupled to and decoupled from the percutaneous electrical connector.

[0040] Other variations are within the spirit of the present invention. Thus, while the invention is susceptible to various modifications and alternative constructions, certain illustrated embodiments thereof are shown in the drawings and have been described above in detail. It should be understood, however, that there is no intention to limit the invention to the specific form or forms disclosed, but on the contrary, the intention is to cover all modifications, alternative constructions, and equivalents falling within the spirit and scope of the invention, as defined in the appended claims.

[0041] The use of the terms a and an and the and similar referents in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The terms comprising, having, including, and containing are to be construed as open-ended terms (i.e., meaning including, but not limited to,) unless otherwise noted. The term connected is to be construed as partly or wholly contained within, attached to, or joined together, even if there is something intervening. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., such as) provided herein, is intended merely to better illuminate embodiments of the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.

[0042] Preferred embodiments of this invention are described herein, including the best mode known to the inventors for carrying out the invention. Variations of those preferred embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventors expect skilled artisans to employ such variations as appropriate, and the inventors intend for the invention to be practiced otherwise than as specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.

[0043] All references, including publications, patent applications, and patents, cited herein are hereby incorporated by reference to the same extent as if each reference were individually and specifically indicated to be incorporated by reference and were set forth in its entirety herein.