Devices, systems and methods for shock absorption

Patent metadata

Field	Value
Publication number	US-12013010-B2
Application number	US-202017764194-A
Country	US
Kind code	B2
Filing date	Sep 28, 2020
Priority date	Sep 27, 2019
Publication date	Jun 18, 2024
Grant date	Jun 18, 2024

Abstract

Devices, systems, and methods for shock absorption are provided herein. Collapsible shock absorption devices have an inner wall having at least one orifice, an outer wall, and a fluid sealed within the outer wall can mitigate sharp increases in force during loading and can better distribute loading forces. In some cases, collapsible shock absorption devices disclosed herein are used for prevention of injury to a biological tissue of a subject or damage to an inanimate object.

First claim

What is claimed is:

1. A device for absorbing external impact forces, comprising:
a collapsible elongated chamber having a first wall which resists circumferential expansion;
a refill chamber at least partially enclosing an outer surface of the first wall of the collapsible elongated chamber, wherein said refill chamber is configured to expand in response to an internal pressure;
a membrane disposed between the inner surface of the wall of the refill chamber and the outer surface of the first wall;
a reservoir space disposed between an inner surface of a wall of the refill chamber and the outer surface of the first wall, wherein an interior of the collapsible elongated chamber is in bidirectional fluidic communication with the reservoir space via at least one orifice disposed through the first wall; and
an incompressible fluid contained in the interior of the collapsible elongated chamber, wherein the reservoir space receives the incompressible fluid to expand the refill chamber as the incompressible fluid flows from the interior of the chamber through the at least one orifice when the chamber is compressed by the external impact forces, whereby the impact forces are absorbed or dissipated by the device.

2. The device of claim 1 , wherein the wall of the refill chamber is configured to circumferentially expand outward in a substantially radial direction in response to the internal pressure.

3. The device of claim 1 , wherein a wall of the refill chamber comprises an elastic material.

4. The device of claim 1 , wherein the reservoir space is in bidirectional fluid communication with an interior of a first collapsible elongated chamber and an interior of a second collapsible elongated chamber.

5. The device of claim 1 , wherein the incompressible fluid is water.

6. The device of claim 1 , wherein the collapsible elongated chamber is axially collapsible.

7. The device of claim 1 , wherein an orifice of the at least one orifice is disposed through the first wall at a proximal end of the collapsible elongated chamber, wherein an orifice of the at least one orifice is disposed through the first wall at a proximal end of the collapsible elongated chamber, or wherein an orifice of the at least one orifice is disposed through the first wall between the proximal end and the distal end of the collapsible elongated chamber.

8. The device of claim 1 , wherein an orifice of the at least one orifice has a cross-sectional area of from 1 mm 2 to 1,000 mm 2 .

9. The device of claim 1 , wherein the cross-sectional area of the collapsible elongated chamber decreases linearly along a longitudinal axis of the device, from a proximal end to a distal end or wherein the cross-sectional area of the collapsible elongated chamber decreases non-linearly along a longitudinal axis of the device, from a proximal end to a distal end.

10. The device of claim 1 , wherein the membrane is a high-strength material, wherein the membrane comprises a permeable material or an impermeable material or wherein at least a portion of the membrane is mechanically isotropic.

11. The device of claim 1 , wherein the collapsible elongated chamber has an axial height of from 5 mm to 1,000 mm when undeformed.

12. The device of claim 11 , wherein the collapsible elongated chamber has an axial height of from 10 mm to 50 mm when undeformed or wherein the collapsible elongated chamber has an axial height of from 10 mm to 50 mm when undeformed.

13. The device of claim 1 , wherein the collapsible elongated chamber has a maximum width perpendicular to a longitudinal axis of from 5 mm to 50 mm when undeformed.

14. The device of claim 1 , wherein a maximum width of a proximal end of the collapsible elongated chamber is from 5 mm to 60 mm when undeformed or wherein a maximum width of a distal end of the collapsible elongated chamber is from 5 mm to 60 mm when undeformed.

15. The device of claim 1 , further comprising an elastically compressible material disposed within the first collapsible elongated chamber and coupled to an inner surface of the first wall at a proximal end of the device.

Assignees

• Univ Leland Stanford Junior

Inventors

• Fanton Michael G
• Domel August G
• Alizadeh Hossein Vahid
• Camarillo David B

Classifications

• F16F9/08

  where gas is} in a chamber with a flexible wall {(pressurised fluid system accumulators per se F15B1/04) · CPC title

• F16F2236/04

  Compression · CPC title

• F16F2230/36

  Holes, slots or the like · CPC title

• F16F2228/001

  Specific functional characteristics in numerical form or in the form of equations · CPC title

• F16F2222/12

  Fluid damping · CPC title