Medical device dislodgment detection

Patent metadata

Field	Value
Publication number	US-11529449-B2
Application number	US-202016780988-A
Country	US
Kind code	B2
Filing date	Feb 4, 2020
Priority date	Apr 15, 2019
Publication date	Dec 20, 2022
Grant date	Dec 20, 2022

Abstract

In examples described herein, a system includes an elongate member configured to be introduced into vasculature of a patient. The elongate member includes a pressure sensor configured to generate a pressure signal indicative of pressure in the vasculature adjacent the needle. The system includes processing circuitry configured to receive the pressure signal from the pressure sensor, detect, based on the pressure signal, dislodgment of the elongate member from the vasculature, and generate an output in response to detecting the dislodgment of the elongate member from the vasculature.

First claim

What is claimed is:

1. A system comprising:
an elongate member configured to be introduced into vasculature of a patient, wherein the elongate member comprises a pressure sensor configured to generate a pressure signal indicative of pressure adjacent the elongate member; and
processing circuitry configured to:
receive the pressure signal from the pressure sensor,
detect, based on the pressure signal, dislodgment of the elongate member from the vasculature, and
generate an output in response to detecting the dislodgment of the elongate member from the vasculature,
wherein the processing circuitry is configured to detect the dislodgment of the elongate member by at least:
determining the pressure adjacent the elongate member based on the pressure signal; and
comparing the pressure adjacent the elongate member with a threshold pressure value.

2. The system of claim 1 , wherein the elongate member comprises at least one of a needle, a catheter, or a cannula.

3. The system of claim 1 , wherein the elongate member comprises a venous needle, the system further comprising:
an arterial needle configured to be introduced into the vasculature; and
a dialysis unit fluidically coupled to the venous needle and the arterial needle.

4. The system of claim 3 , wherein the dialysis unit is configured to dialyze a volume of fluid extracted from the vasculature through the arterial needle and return a volume of dialyzed fluid to the vasculature through the venous needle.

5. The system of claim 3 , wherein the processing circuitry is configured to generate the output by at least controlling the dialysis unit based on the detection of the dislodgment of the venous needle from the vasculature.

6. The system of claim 5 , wherein the processing circuitry is configured to control the dialysis unit by at least causing a dialysis pump of the dialysis unit to stop extracting fluid from the vasculature.

7. The system of claim 1 , further comprising a user interface, wherein the processing circuitry is configured to generate the output by at least presenting a notification via the user interface that instructs a user to reposition the elongate member in the vasculature.

8. The system of claim 1 , wherein the processing circuitry is configured to detect the dislodgment of the elongate member in response to determining the pressure adjacent the elongate member is less than or equal to the threshold pressure value.

9. The system of claim 1 , wherein the threshold pressure value is at least one of lower than a predetermined nominal pressure or greater than an atmospheric pressure value.

10. A system comprising:
an elongate member configured to be introduced into vasculature of a patient, wherein the elongate member comprises a pressure sensor configured to generate a pressure signal indicative of pressure adjacent the elongate member; and
processing circuitry configured to:
receive the pressure signal from the pressure sensor,
detect, based on the pressure signal, dislodgment of the elongate member from the vasculature, and
generate an output in response to detecting the dislodgment of the elongate member from the vasculature,

wherein the pressure signal comprises an analog pressure signal, and wherein the processing circuitry is configured to detect the dislodgment of the elongate member by at least:
determining the analog pressure signal does not include a pulse pressure wave component, the pulse pressure wave being indicative of a pulse pressure of the patient, wherein to determine the analog pressure signal does not include the pulse wave component, the processing circuitry is configured to:
detect a dialysis pump pressure wave component in the analog pressure signal,
generate a residual wave by at least filtering the dialysis pump pressure wave component from the analog pressure signal, and
determine the residual wave does not include the pulse pressure wave component; and

detecting the dislodgment of the elongate member in response to determining the analog pressure signal does not include the pulse pressure wave component.

11. The system of claim 1 , wherein the elongate member comprises an inner surface defining a lumen, wherein the pressure sensor is positioned along the inner surface.

12. The system of claim 1 , wherein the elongate member comprises an outer surface, wherein the pressure sensor is positioned along the outer surface.

13. The system of claim 1 , wherein the elongate member defines an inner surface and an outer surface, the pressure sensor being at least partially embedded in at least one of the inner surface or the outer surface.

14. The system of claim 1 , wherein the pressure sensor comprises a micro-electro-mechanical systems (MEMS) pressure sensor.

15. The system of claim 1 , wherein the processing circuitry is configured to detect a venous stenosis in the vasculature based on the pressure signal.

16. The system of claim 15 , wherein the threshold pressure value comprises a first threshold pressure value, and wherein the processing circuitry is configured to detect the venous stenosis in response to determining the pressure adjacent the elongate member is greater than or equal to a second threshold pressure value.

17. The system of claim 16 , further comprising a dialysis unit configured to deliver fluid to the patient via the elongate member, wherein the processing circuitry is configured to modify an operation of the dialysis unit in response to detecting the venous stenosis.

18. The system of claim 15 , wherein the processing circuitry is configured to detect the venous stenosis by at least:
determining a flow rate through the vasculature based on the pressure signal;
detecting a threshold pressure change in the vasculature based on the pressure signal;
detecting a threshold flow rate change in the vasculature based on the determined flow rate; and
detecting the venous stenosis in the vasculature in response to detecting the threshold pressure change and the threshold flow rate change.

19. The system of claim 18 , further comprising a dialysis unit configured to deliver fluid to the patient via the elongate member, wherein the processing circuitry is configured to modify an operation of the dialysis unit in response to detecting the venous stenosis.

20. A system comprising:
an elongate member configured to be introduced into vasculature of a patient, wherein the elongate member comprises a pressure sensor configured to generate a pressure signal indicative of pressure adjacent the elongate member;
a reference pressure sensor configured to generate a reference pressure signal indicative of a reference pressure external to the vasculature; and
processing circuitry configured to:
receive the pressure signal from the pressure sensor,
detect, based on the pressure signal and the reference pressure signal, dislodgment of the elongate member from the vasculature, and

generate an output in response to detecting the dislodgment of the elongate member from the vasculature.

21. The system of claim 20 , wherein the processing circuitry is configured to detect the dislodgment of the elongate member based on the pressure signal and the reference pressure signal by at least:
determining, based on the pressure signal and the reference pressure signal, a differential pressure; and
comparing the differential pressure with a threshold pressure.

22. The system of claim 20 , wherein the processing circuitry is configured to detect the dislodgment of t

Assignees

• Medtronic Inc

Inventors

• Bloomberg Daniel
• Manda Venkatesh

Classifications

• A61M2205/502

  User interfaces, e.g. screens or keyboards · CPC title

• A61M2230/30

  Blood pressure (A61M2230/04 takes precedence) · CPC title

• A61M2205/581

  by audible feedback · CPC title

• A61M2205/3344

  Measuring or controlling pressure at the body treatment site · CPC title

• A61M2205/0244

  Micromachined materials, e.g. made from silicon wafers, microelectromechanical systems [MEMS] or comprising nanotechnology · CPC title