Device for the mechanical detection of underlying tissues
The invention provides a device for the mechanical detection of a specific underlying tissue in a subject, comprising a container, wherein the container comprises a probe, spring, sensor, and signal indicator, wherein when a mechanical force is applied to the probe, it is transmitted to the sensor, whereby the sensor provides the signal indicator with a signal and the signal indicator indicates to the user an indication of detection of the specific underlying tissue in the subject. The sensor of the invention can be an electrical sensor such as a piezoelectric force transducer or a balloon. The invention also provides a method of performing a cricothyrotomy using the device.
1. A device for the mechanical detection of a specific underlying tissue in a subject, comprising a container, wherein the container comprises a probe, spring, sensor, and signal indicator, wherein when a mechanical force is applied to the probe, the force is transmitted to the sensor, whereby the sensor provides the signal indicator with a signal and the signal indicator provides an indication of detection of the specific underlying tissue in the subject,
wherein:
i) the device is calibrated to detect thyroid cartilage and cricoid cartilage, the signal indicator does not provide an indication when pressed against the cricothyroid membrane and the signal indicator provides an indication when the device is pressed against one of the thyroid cartilage and the cricoid cartilage;
ii) the device is calibrated to detect a cricothyroid membrane, the signal indicator provides an indication when the device is pressed against the cricothyroid membrane and the signal indicator does not provide an indication when pressed against one of the thyroid cartilage and the cricoid cartilage; or
iii) the device provides a first momentary indicating signal when the device is pressed against one of thyroid cartilage and cricoid cartilage, and the device provides a second momentary indication when the device is transitioned by sliding and is pressed against a cricothyroid membrane.
2. The device of claim 1 , wherein a first end of the probe contacts a spring within the container and a second end of the probe protrudes outside of the container.
3. The device of claim 1 , wherein the container further comprises a spring pin and wherein a first end of the probe contacts the spring pin and a second end of the probe protrudes outside of the container.
4. The device of claim 1 , wherein the spring is made of steel with a spring constant of about k=333.33 N/m.
5. The device of claim 4 , wherein the spring consists of 8-14 coils, with a spring diameter of about 0.014 m and a wire thickness of about 0.001 m.
6. The device of claim 1 , wherein the container comprises a horizontal member or a flange that protrudes from an end of the container perpendicular to a major axis of the container.
7. The device of claim 1 , wherein the sensor is a piezoelectric force transducer.
8. The device of claim 7 , wherein the sensor is capable of measuring a force of 2 N and is capable of sending an output of 2 Volts.
9. The device of claim 1 , wherein the signal indicator is a light emitting diode (LED).
10. The device of claim 1 , wherein the container has a cylindrical shape, wherein one end of the container is connected to the signal indicator and the probe protrudes from an opposing end of the container.
11. The device of claim 1 , wherein the signal indicator is an LED that turns on when pressed against thyroid or cricoid cartilage but does not turn on when pressed against the cricothyroid membrane.
12. The device of claim 1 , wherein the signal indicator is an LED that turns on when the probe is transitioned from pressing against thyroid or cricoid cartilage to pressing against cricothyroid membrane.
13. The device of claim 1 , wherein the device detects a change in elasticity of underlying tissues.
14. The device of claim 13 , wherein the signal indicator momentarily provides an indication when the probe is pressed against thyroid or cricoid cartilage and again momentarily provides an indication when the probe is transitioned to pressing against cricothyroid membrane.
15. The device of claim 14 , wherein the indication is a light provided by an LED.
16. The device of claim 1 , wherein the sensor is a balloon.
17. The device of claim 16 , wherein the balloon has a volume of about 9.17×10 −7 m 3 and an internal gauge pressure of about 60,069 Pascals.
18. The device of claim 16 , wherein the signal indicator is a pressure gage.
19. The device of claim 18 , wherein the pressure gage provides an indication of pressure of between about 0 and about 100 kPa.
20. The device of claim 18 , wherein the pressure gage provides an indication at a pressure of about 27 kPa.
21. A kit comprising the device of claim 1 and a base configured to be placed on a subject's neck with a slot in the base over thyroid cartilage, cricothyroid membrane and cricoid cartilage.
22. A method of performing a cricothyrotomy, comprising locating the cricothyroid membrane with the device of claim 1 and performing an incision on the located cricothyroid membrane.