CN-121985902-A - Stent system with hydrodynamic monitoring

Abstract

A stent and stent system includes hydrodynamic monitoring. The cradle may have an integral inductive receiver and an integral capacitor to facilitate hydrodynamic monitoring. The stent may comprise a layer that is a continuous sinusoidal curve. The rack system may further include a transceiver including a processor and an inductive transmitter for coupling to an inductive receiver of the rack. The control unit monitors the frequency of the impedance change at the sensing receiver and determines the fluid pressure and/or flow rate based on the feedback signal.

Inventors

• GUAN ZEYI
• N. Dabiq
• C. Chinbis
• S. S. tuniev
• R.J. O'Brien

Assignees

• 美敦力瓦斯科尔勒公司

Dates

Publication Date

20260505

Application Date

20241016

Priority Date

20231016

Claims (15)

1. 1. A stent configured for hydrodynamic monitoring, the stent comprising: A stent body designed and configured to be inserted into a body lumen of a subject, the stent body comprising: The inner conductive layer is formed of a conductive material, An outer conductive layer, and An insulating layer between the inner conductive layer and the outer conductive layer, Wherein the inner conductive layer and the outer conductive layer and the insulating layer together form a capacitor for use in hydrodynamic monitoring.
2. 2. The cradle of claim 1, wherein one of the inner conductive layer and the outer conductive layer forms an inductive receiver, wherein the capacitor and the inductive receiver form a cradle circuit, the inductive receiver configured to inductively couple with a remote inductive transmitter to induce a current within the cradle circuit.
3. 3. The bracket of claim 2, wherein the inner conductive layer forms the inductive receiver.
4. 4. A stent according to claim 3 wherein the outer conductive layer is a structural layer that provides structure and support for the stent body to function properly as a stent.
5. 5. The stent of any one of claims 1 to 4, wherein the stent body is formed of stent wires formed as a continuous sinusoidal curve.
6. 6. The stent of any one of claims 1-5, wherein the stent body is expandable and configured to conform to a lesion in a blood vessel.
7. 7. The cradle of claim 2 in combination with a portable transceiver comprising the inductive transmitter and a control unit configured to monitor the frequency of impedance changes at the inductive receiver.
8. 8. The stent of any one of claims 1-7, wherein the inner conductive layer comprises at least one of gold and platinum.
9. 9. The stent of any one of claims 1 to 8, wherein the outer conductive layer comprises a nickel-cobalt alloy.
10. 10. The stent of any one of claims 1 to 9, wherein the insulating layer comprises a ceramic.
11. 11. The stent of any one of claims 1 to 10, wherein the stent body further comprises an outer electrical insulator layer surrounding the outer electrically conductive layer.
12. 12. A stent system configured for hydrodynamic monitoring, the stent system comprising: a stent configured for implantation into a body lumen of a subject, the stent comprising a stent wire comprising a conductive layer shaped as a continuous sinusoidal curve to form an inductive receiver, A transceiver comprising an inductive transmitter and a control unit, wherein the inductive transmitter is configured to inductively couple with the inductive receiver to induce a current within the stent wire.
13. 13. A stent configured for hydrodynamic monitoring, the stent comprising: A stent body designed and configured to be inserted into a body cavity of a subject, the stent body integrally forming an inductive receiver and a capacitor, wherein the inductive receiver and the capacitor form an LRC circuit.
14. 14. The stent of claim 13, wherein the stent body comprises: The inner conductive layer is formed of a conductive material, An outer conductive layer, and An insulating layer between the inner conductive layer and the outer conductive layer, Wherein the inner conductive layer and the outer conductive layer together with the insulating layer form the capacitor, Wherein one of the inner conductive layer and the outer conductive layer forms the inductive receiver.
15. 15. The cradle of any one of claims 13 or 14, in combination with a portable transceiver comprising an inductive transmitter and a control unit configured to monitor the frequency of impedance changes at the inductive receiver.

Description

Stent system with hydrodynamic monitoring Technical Field The present technology relates generally to a stent system with hydrodynamic monitoring, such as a vascular stent system with hemodynamic monitoring. Background Stents are used to open and/or maintain patency of a body lumen. Cardiovascular stents (e.g., coronary stents) are widely used to treat vascular occlusions due to plaque or lesions in blood vessels. The stent opens the vessel and resumes blood flow. One problem with using stents is restenosis and the occurrence of target lesion revascularization. It would be advantageous to develop a system for monitoring blood flow through an implanted stent to detect restenosis, thrombosis, or delayed re-endothelialization. Attempts have been made to couple pressure sensors directly to the support, but with limited success. The disadvantage of such a system is the lack of robustness, stability and manufacturability. Disclosure of Invention The technology of the present disclosure generally relates to a stent system with hemodynamic monitoring, wherein the stent of the system is formed as a continuous sinusoidal curve that acts as an antenna (inductive receiver) and/or the stent includes an integral capacitor for pressure sensing. In one aspect, the present disclosure provides a stent configured for hydrodynamic monitoring. The stent includes a stent body designed and configured to be inserted into a body lumen of a subject. The bracket body includes an inner conductive layer, an outer conductive layer, and an insulating layer between the inner conductive layer and the outer conductive layer. The inner conductive layer and the outer conductive layer together with the insulating layer form a capacitor for use in hydrodynamic monitoring. In another aspect, the present disclosure provides a stent system configured for hydrodynamic monitoring. The stent system includes a stent configured to be implanted into a body lumen of a subject and a transceiver including an inductive transmitter and a control unit. The stent includes a stent wire that includes a conductive layer that is shaped as a continuous sinusoidal curve to form an inductive receiver. The inductive transmitter of the transceiver is configured to inductively couple with the inductive receiver to induce a current in the bracket wire. In yet another aspect, the present disclosure provides a stent configured for hydrodynamic monitoring. The stent includes a stent body designed and configured to be inserted into a body lumen of a subject. The cradle body integrally forms an inductive receiver and a capacitor, wherein the inductive receiver and the capacitor form an LRC circuit. The details of one or more aspects of the disclosure are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the technology described in this disclosure will be apparent from the description and drawings, and from the claims. Drawings Fig. 1 is a conceptual diagram of a stent system of the present disclosure, illustrating a system for use with a patient. Fig. 2 is a side elevation view of a bracket of the bracket system. Fig. 3 is an enlarged sinusoidal portion of a stent wire of a stent, further comprising an enlarged detail cross-section of the stent wire showing its layers. Fig. 4 is a circuit diagram of a transceiver circuit and a bracket circuit inductively coupled to each other. FIG. 5 is a side elevation view of another embodiment of a bracket including a separate sensor coupled thereto. Fig. 6 is a circuit diagram of the bracket of fig. 5. Fig. 7 is a schematic view of the stent of fig. 5 implanted in a blood vessel and coupled to a transceiver. Detailed Description The present specification relates to a stent system for hydrodynamic sensing within a body lumen, such as by capacitive pressure sensing. In one or more embodiments, the continuous sinusoidal wire of the stent of the system acts as an inductive receiver or coil (broadly, an antenna) inductively coupled with an inductive transmitter (inductor coil) to simultaneously induce an alternating current in the stent and provide signal feedback for determining the fluid pressure and/or flow rate in the stent. In one or more embodiments, the rack of the system includes a rack wire having multiple layers including conductive layers separated by an insulator (i.e., dielectric), whereby the rack has an integrally formed inductive receiver for wireless power and an integrally formed capacitor for use in fluid pressure sensing. Referring to fig. 1, a first embodiment of a stent system is indicated generally by the reference numeral 10 and is configured for hydrodynamic sensing, such as changes in fluid pressure and/or flow rate, within a body lumen. The illustrated stent system includes a vascular stent, generally indicated at 12, designed and configured for restoring/augmenting/maintaining patency of a blood vessel (e.g., coronary artery), such as during or after an angi