Flow through heater

Patent metadata

Field	Value
Publication number	US-9532404-B2
Application number	US-201113096993-A
Country	US
Kind code	B2
Filing date	Apr 28, 2011
Priority date	Apr 28, 2010
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

An electrical heating device for medical equipment is provided. The heating device includes a body, which may be an insulating body forming a channel therethrough for fluid travel, an insulating material surrounding the body, and a heater surrounding the body and the insulating material. In other forms, the electrical heating device for medical equipment has a conducting body, instead of an insulating body, forming a channel therethrough for fluid travel. A base dielectric layer is disposed on the conducting body, and a heater surrounds the base dielectric layer and the conducting body. A top dielectric layer is disposed on the heater, and a protection housing surrounds the top dielectric layer.

First claim

What is claimed is:

1. An electrical heating device for medical equipment, the heating device comprising:
an insulating body forming a channel therethrough for fluid travel;
an insulating material surrounding the insulating body;
a heater surrounding the insulating material and the insulating body; and
a protection housing that is preformed and that defines a cavity to receive the heater in the cavity,
wherein the protection housing includes opposing first and second ends that define a longitudinal direction of the protection housing, an inner portion extending from the first end to the second end along the longitudinal direction, a side portion disposed at each of the first and second ends and at each side of the heater, and
wherein the inner portion and the side portion define the cavity to receive the heater and the insulating material therein such that the inner portion is surrounded by the heater and the insulating material and is sandwiched between the insulating body and the insulating material to separate the heater and the insulating material from the insulating body and such that neither the heater nor the insulating material make direct contact with the insulating body.

2. The electrical heating device according to claim 1 , the insulating material being in the form of a base layer dielectric, the electrical heating device further comprising a top layer dielectric, the heater surrounding the base layer dielectric, the top dielectric disposed over the heater, the base layer and top layer dielectrics cooperating to encapsulate the heater, the base layer and top layer dielectrics being disposed within the protection housing.

3. The electrical heating device according to claim 2 , further comprising a temperature sensor, wherein an end of the temperature sensor is disposed within the protection housing.

4. The electrical heating device according to claim 2 , further comprising an electrically and thermally insulating compound disposed within the protection housing and surrounding the heater, the top layer dielectric, and the base layer dielectric.

5. The electrical heating device according to claim 2 , further comprising a measurement circuit electrically connected to the protection housing, the measurement circuit being configured to measure the leakage current through the insulating body and the dielectric.

6. The electrical heating device according to claim 1 , wherein the insulating body is biocompatible.

7. The electrical heating device according to claim 1 , wherein the insulating body is not hygroscopic.

8. The electrical heating device according to claim 1 , the insulating body being formed of sintered ceramic.

9. The electrical heating device according to claim 1 , the protection housing and the insulating body having a holohedral contact therebetween.

10. The electrical heating device according to claim 9 , further comprising a turbulence-inducing structure located in the channel of the insulating body.

11. The electrical heating device according to claim 1 , the heater being formed by a layering process.

12. The electrical heating device according to claim 1 , further comprising a conductive layer disposed between the insulating body and the heater.

13. The electrical heating device according to claim 12 , wherein the insulating body is a primary insulating body, the insulating material being in the form of a secondary insulating body surrounding the conductive layer and the primary insulating body, wherein the heater directly contacts the secondary insulating body.

14. The electrical heating device according to claim 13 , further comprising a dielectric disposed between the heater and the protection housing, the secondary insulating body and the dielectric cooperating to encapsulate the heater.

15. The electrical heating device according to claim 14 , further comprising an electrically and thermally insulating compound disposed around the dielectric, the heater, and the secondary insulating body.

16. The electrical heater according to claim 15 , wherein the protection housing and the conductive layer cooperate to encapsulate the secondary insulating body, the heater, the dielectric, and the compound.

17. The electrical heating device of claim 1 , wherein the protection housing further includes an outer portion surrounding the heater and the inner portion, and wherein the inner portion is spaced apart from the outer portion along a radial direction of the protection housing, the cavity being defined between the outer portion and the inner portion.

Assignees

• Wallinger Martin
• Antosch Gernot
• Lehnert Reiner
• Pöschl Wolfgang
• Schefbänker Gerhard
• Watlow Electric Mfg

Inventors

• Wallinger Martin
• Antosch Gernot
• Lehnert Reiner
• Pöschl Wolfgang
• Schefbänker Gerhard

Classifications

• H05B2203/021

  Heaters specially adapted for heating liquids · CPC title

• H05B3/58 Primary

  Heating hoses; Heating collars · CPC title

• A61M5/44 Primary

  having means for cooling or heating the devices or media · CPC title

• A61F7/007

  characterised by electric heating · CPC title

• H05B3/40

  Heating elements having the shape of rods or tubes (H05B3/62, H05B3/68, H05B3/78 take precedence) · CPC title