Medical Devices, Systems And Methods Utilizing Permanent Magnet And Magnetizable Feature

Patent metadata

Field	Value
Publication number	US-2017348510-A1
Application number	US-201615170518-A
Country	US
Kind code	A1
Filing date	Jun 1, 2016
Priority date	Jun 1, 2016
Publication date	Dec 7, 2017
Grant date	—

Abstract

Systems, methods and devices are described including a catheter adapter subassembly including a magnetic feature. Systems include such a catheter adapter subassembly and a needle subassembly including a magnetic feature, and relative movement of the catheter adapter subassembly and the needle subassembly can be determined using a magnetometer.

First claim

What is claimed is:

1 . A medical device comprising:
a catheter assembly, the catheter assembly including a catheter adapter subassembly and a needle subassembly, wherein one of the catheter adapter subassembly and the needle subassembly includes a permanent magnet element, and the other of the catheter subassembly and the needle subassembly includes a magnetizable feature.

2 . The medical device according to claim 1 , wherein the needle subassembly includes the magnetizable feature and the catheter adapter subassembly includes the permanent magnet element, and the magnetizable feature of the needle subassembly is selected from the group consisting of a needle adhesive, the needle, a needle safety element, a notch, a needle ferrule, and a spot weld.

3 . The medical device according to claim 1 , wherein at least one of the permanent magnet element and magnetizable feature includes an adhesive.

4 . The medical device according to claim 3 , wherein the catheter adapter subassembly includes catheter tubing and a catheter adapter body, and the adhesive attaches the catheter tubing to the catheter adapter body.

5 . The medical device according to claim 3 , wherein the needle subassembly includes a cannula and a hub, and the adhesive attaches the cannula to the hub.

6 . The medical device according to claim 1 , wherein the needle subassembly includes the magnetizable feature, a cannula and a hub, and the catheter adapter subassembly includes a catheter adapter body, catheter tubing and the permanent magnet element, wherein the permanent magnet element is selected from the group consisting of a metal mandrel for connecting catheter tubing to the hub, a catheter tubing adhesive, a blood control component of the catheter adapter subassembly, and a magnetic wedge on the catheter adapter body.

7 . The medical device according to claim 6 , wherein the magnet on the catheter adapter body is integrally molded with the catheter adapter body.

8 . The medical device according to claim 1 , wherein the catheter adapter subassembly includes the permanent magnet element and the needle subassembly includes the magnetizable feature and the magnetizable feature is a magnetizable needle.

9 . The medical device according to claim 3 , wherein the adhesive includes an additive selected from a paramagnetic additive, a ferromagnetic additive and combinations thereof.

10 . The medical device according to claim 9 , wherein the additive includes a component selected from the group consisting of powdered iron, magnetic iron oxide, magnetic titanium oxide, magnetic powdered steel, and a magnetic iron alloy, and mixtures thereof.

11 . The medical device according to claim 10 , wherein the magnetic iron alloy includes one or more of nickel, zinc, and copper.

12 . The medical device according to claim 10 , wherein the additive further comprises a component selected from chromium, magnesium, molybdenum and combinations thereof.

13 . The medical device according to claim 1 , wherein the needle subassembly includes the permanent magnet element, and the catheter adapter subassembly includes the magnetizable feature, wherein the magnetizable feature includes magnetizable catheter tubing.

14 . The medical device according to claim 1 , wherein needle subassembly includes a cannula, the catheter adapter subassembly includes a catheter adapter body, catheter tubing and the permanent magnet element, and the permanent magnet element has north and south poles on axis with the catheter tubing and with the cannula.

15 . The medical device according to claim 1 , wherein the needle subassembly includes a cannula and the permanent magnet element, the catheter adapter subassembly includes a catheter adapter body and catheter tubing, and wherein the permanent magnet element has north and south poles on axis with the catheter tubing and with the cannula.

16 . A system for determining relative position of a catheter adapter subassembly and a needle subassembly comprising:
a catheter having a catheter distal tip and a needle having a needle distal tip; a permanent magnet element associated with one of the catheter adapter subassembly and needle subassembly; a magnetizable feature associated with the other of the catheter adapter subassembly and the needle subassembly; and magnetometers positioned with respect to the catheter adapter subassembly and the needle subassembly, the magnetometers configured to determine relative movement of the catheter adapter subassembly and needle subassembly.

17 . The system of claim 16 , wherein the permanent magnet or the magnetizable feature on a fixed location on the catheter adapter subassembly or needle subassembly provides a measurement datum to determine movement of the magnetizable feature and permanent magnet.

18 . The system of claim 17 , wherein the permanent magnet is on the needle subassembly and the magnetizable feature is on the catheter adapter subassembly.

19 . The system of claim 17 , wherein the permanent magnet is on the catheter adapter subassembly and the magnetizable feature is on the needle subassembly.

20 . The system of claim 17 , wherein the magnetometers include three different magnetometers arranged in a three-dimensional grid array as part of an ultrasound system which can derive a three-dimensional correlation to obtain a distance from the grid array to the magnetizable feature or permanent magnet.

21 . The system of claim 20 , wherein the three-dimensional correlation is determined by a function I=f(B i μ r ), where i =x or y or z along three axes, x, y and z are distances in three planes, B is a known magnetic field produced by the permanent magnet or magnetizable feature, and μ r is magnetic permeability.

22 . The system of claim 20 , wherein the correlation provides a distance in three planes to determine location of the catheter distal tip.

23 . The system of claim 20 , wherein the correlation provides a distance in three planes to determine location of the needle distal tip.

24 . A method for determining a relative position of a catheter tip and a needle cannula tip, the method comprising:
providing a catheter adapter subassembly including catheter and a needle subassembly including a needle, the catheter having a catheter distal tip and the needle having a needle distal tip; associating a permanent magnet element with one of the catheter and the needle; associating a magnetizable feature with the other of the catheter and the needle; obtaining a measured position of the permanent magnet; obtaining a measured position of the magnetizable feature to obtain a calculated position of the catheter distal tip and a calculated position of the needle distal tip; and comparing the calculated position of the catheter distal tip with the calculated position of the needle distal tip to determine the relative position of the catheter distal tip and the needle distal tip.

25 . The method of claim 24 , wherein the needle includes the magnetizable feature and the catheter includes the permanent magnet and the relative position of the catheter distal tip and the needle distal tip indicates that the catheter is properly seated on the needle.

26 . The method claim 24 , wherein the relative position of the catheter distal tip and the needle distal tip indicates that the catheter is in a hooded position on the needle.

27 . The method

Assignees

• Becton Dickinson Co

Inventors

• Shevgoor Siddarth
• Burkholz Jonathan Karl
• Henderson Edward G

Classifications

• A61B5/062

  using magnetic field · CPC title

• A61M2039/0276

  for introducing or removing fluids into or out of the body · CPC title

• A61M39/0247

  Semi-permanent or permanent transcutaneous or percutaneous access sites to the inside of the body (peritoneal dialysis catheters A61M1/285; tracheostomy devices A61M16/0465; measuring pressure within the body A61B5/03; colostomy devices A61F5/445; gastrotomy feeding tubes A61J15/0015; means for fixing a feeding tube outside of the body A61J15/0053) · CPC title

• A61M2039/0273

  for introducing catheters into the body · CPC title

• A61B2090/3966

  Radiopaque markers visible in an X-ray image · CPC title