Adjustable piston

Patent metadata

Field	Value
Publication number	US-11020312-B2
Application number	US-201815982729-A
Country	US
Kind code	B2
Filing date	May 17, 2018
Priority date	Jun 6, 2014
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

Techniques and devices for extending a piston, for example connected to a medical device such as a mechanical CPR device, to accommodate different sized patients, are described herein. In some cases, a piston of a mechanical CPR device may include an inner piston at least partially slidable into an external piston sleeve. In one aspect, an external piston spacer may be attached to an outward surface of the inner piston to extend the length of the piston. In another aspect an internal bayonet sleeve may contact one or more locking rods at various positions, enabling adjustment of the length of the inner piston. In yet another aspect, a piston adapter may be removably attached to the end of the piston. In all aspects, the change in length of the piston may be detected and used to modify movement of the piston, for example to more safely perform mechanical CPR.

First claim

What is claimed:

1. A mechanical cardiopulmonary resuscitation (CPR) device, comprising:
a piston having a piston surface;
a controller configured to create an oscillation of the piston;
a piston adapter contactable with the piston surface comprising:
a suction cup;
a body attached to the suction cup; and
a piston connection surface disposed on an end of the body opposed to the suction cup, wherein the piston connection surface is configured to removably attach to the piston surface; and

a sensor, disposed on the piston, configured to detect contact with the piston connection surface.

2. The mechanical CPR device of claim 1 , wherein the controller is configured to modify an oscillation of the piston based on the detection of the piston adapter.

3. The mechanical CPR device of claim 2 , wherein the controller is configured to prevent attachment of the piston adaptor to the piston surface prior to modification of the oscillation of the piston based on the detection of the piston adapter.

4. The mechanical CPR device of claim 1 , wherein the sensor is configured to detect a length of the piston adaptor and send the length to the controller.

5. A mechanical cardiopulmonary resuscitation (CPR) device, comprising:
an extendable piston having a length, the extendable piston including an inner piston and an external piston sleeve slidable over the inner piston, wherein the inner piston is biased to at least partially slide into the external piston sleeve;
a removable external piston spacer configured, when engaged to the inner piston, to oppose the bias on the inner piston to at least partially prevent the inner piston from sliding into the external piston sleeve, wherein the removable external piston spacer partially encircles the inner piston; and
a sensor configured to detect a change in the length of the extendable piston.

6. The CPR device of claim 5 , wherein the sensor detects the change in length by detecting a displacement of the inner piston caused by engagement of the removable external piston spacer with the inner piston.

7. The CPR device of claim 6 , further comprising a piston controller configured to modify an oscillation of the extendable piston based on the displacement.

8. The mechanical CPR device of claim 5 , further comprising a drive component connected to the inner piston, wherein the drive component moves the inner piston.

9. The mechanical CPR device of claim 8 , wherein the drive component biases the inner piston.

10. The mechanical CPR device of claim 5 , wherein a distal end of the inner piston comprises a patient-engagement portion.

11. A mechanical cardiopulmonary resuscitation (CPR) device, comprising:
an extendable piston having a length, the extendable piston including a center piston having a center piston end, an external piston sleeve rotatably connected to the center piston, and an internal bayonet sleeve, rotatably disposed along an outside surface of the center piston, wherein the internal bayonet sleeve is configured to removably engage the center piston, further wherein displacement of the center piston end away from the internal bayonet sleeve disengages the center piston from the internal bayonet sleeve; and
a piston position sensor configured to detect a change in the length of the extendable piston.

12. The mechanical CPR device of claim 11 , wherein the center piston position sensor detects a change in length at least in part by detecting a displacement of the center piston relative to the external piston sleeve.

13. The mechanical CPR device of claim 11 , wherein the center piston end comprises a patient-engagement portion.

14. The mechanical CPR device of claim 11 , wherein the center piston position sensor is configured to communicate the detected change in length to a piston controller, wherein the piston controller is configured to modify an oscillation of the extendable piston based on the detected change in length.

15. The mechanical CPR device of claim 11 , wherein the center piston position sensor detects a change in length at least in part by detecting a change in a point of contact between the center piston and the internal bayonet sleeve.

Assignees

• Physio Control Inc

Inventors

• Jeppsson Anders
• Ehrstedt Marcus

Classifications

• A61H31/005 Primary

  with feedback for the user · CPC title

• A61H2201/5092

  Optical sensor · CPC title

• A61H2031/001

  fixed on the chest by suction · CPC title

• A61H2201/5061

  Force sensors · CPC title

• A61H2201/5064

  Position sensors · CPC title