Retractable inflatable bone tamp

Patent metadata

Field	Value
Publication number	US-11006993-B2
Application number	US-201615095667-A
Country	US
Kind code	B2
Filing date	Apr 11, 2016
Priority date	Apr 8, 2011
Publication date	May 18, 2021
Grant date	May 18, 2021

Abstract

An inflatable bone tamp for performing a minimally invasive surgical procedure includes an outer shaft defining an internal lumen, an inflatable structure coupled to the outer shaft, and an inner shaft movably disposed within the internal lumen and coupled to a distal end region of the inflatable structure. The internal lumen is sized to receive the inflatable structure, such that by moving the inner shaft relative to the outer shaft, the inflatable structure can be retracted into the internal lumen (and likewise can be extended from within the internal lumen for deployment in bone). This retraction capability can beneficially protect the inflatable structure during positioning/removal, and can also enhance recovery from radial tears of the inflatable structure.

First claim

The invention claimed is:

1. A device for performing a surgical procedure, the device comprising:
an outer shaft defining an interior lumen;
an inflatable structure coupled to a distal end the outer shaft;
a connector fixed to a proximal end of the outer shaft, the connector defining a cavity in communication with the interior lumen and a port in communication with the cavity;
an inner shaft disposed within the cavity and the interior lumen, wherein the inner shaft is movable with respect to the outer shaft to retract the inflatable structure into the interior lumen and to extend the inflatable structure outside of the interior lumen, a distal end of the inner shaft being closed, the device having a maximum length defined by a distance from a proximal end of the inner shaft to the distal end of the inner shaft; and
a retraction controller comprising a housing that is fixed to the connector, the retraction controller comprising rotary driver elements having the inner shaft positioned therebetween such that the inner shaft spaces outer surfaces of the rotary driver elements apart from one another as the rotary driver elements rotate, the rotary driver elements being positioned in the housing and configured to move the inner shaft relative to the outer shaft in opposite first and second directions to secure a relative position between the inner shaft and the outer shaft, the reaction controller comprising a lock configured to fix the relative position between the inner shaft and the outer shaft when the inner shaft is fully extended and fully retracted relative to the outer shaft, the distal end of the inner shaft being positioned entirely within the interior lumen when the inner shaft is fully retracted, the housing including a proximal wall and a passageway extending through the proximal wall, the inner shaft extending through the passageway, the proximal end of the inner shaft comprising a stop having a diameter larger than a diameter of the passageway to limit extension of the inner shaft relative to the outer shaft,
wherein the retraction controller is configured to itself rotate to rotate the inner shaft such that the inflatable structure wraps around the inner shaft.

2. A device as recited in claim 1 , wherein the inner shaft is rigid.

3. A device as recited in claim 1 , wherein a distal end of the inflatable structure is permanently fixed with the distal end of the inner shaft such that the distal end of the inner shaft protrudes beyond the distal end of the inflatable structure and the inflatable structure forms a single inflated portion.

4. A device as recited in claim 1 , wherein the rotary driver elements are entirely spaced apart from one another when the inner shaft is positioned therebetween.

5. A device as recited in claim 1 , wherein the rotary driver elements are gears having teeth and the inner shaft comprises a series of notches that engage with the teeth so as to space the teeth apart from one another as the rotary driver elements rotate.

6. A device as recited in claim 1 , wherein the lock comprises a releasable latch.

7. A device as recited in claim 1 , wherein:
a proximal end of the inflatable structure is coupled to the distal end of the outer shaft, and
a distal end of the inflatable structure is coupled to the distal end of the inner shaft.

8. A device as recited in claim 7 , wherein the distal end of the inner shaft comprises a shoulder having an increased-diameter positioned distal to the distal end of the inflatable structure.

9. The device of claim 1 , wherein the rotary driver elements are each configured to rotate in response to an actuator positioned within the housing.

10. The device of claim 1 , wherein the inner shaft defines an inflation lumen that terminates at the distal end of the inner shaft.

11. A device as recited in claim 1 , wherein the retraction controller is spaced apart from the outer shaft by the connector.

12. A device as recited in claim 1 , wherein the housing includes an inner surface defining an aperture and an opposite outer surface, a first portion of each of the rotary driver elements being positioned in the aperture and a second portion of each of the rotary driver elements extending through the outer surface.

13. A device as recited in claim 1 , wherein the housing includes an inner surface defining an aperture, a portion of each of the rotary driver elements being positioned in the aperture and a lever of one of the rotary driver elements being positioned outside of the aperture.

14. A device as recited in claim 1 , wherein the inner shaft is non-cannulated.

15. A device as recited in claim 1 , wherein the cavity extends parallel to a longitudinal axis defined by the outer shaft, the port extending transverse to the cavity.

16. A device for performing a surgical procedure, the device comprising:
an outer shaft defining an interior lumen;
an inflatable structure coupled to a distal end of the outer shaft;
a connector fixed to a proximal end of the outer shaft, the connector defining a cavity in communication with the interior lumen and a port in communication with the cavity;
an inner shaft at least partially disposed within the cavity and the interior lumen, wherein the inner shaft is movable with respect to the outer shaft to retract the inflatable structure into the interior lumen and to extend the inflatable structure outside of the interior lumen, a distal end of the inner shaft being closed, the device having a maximum length defined by a distance from a proximal end of the inner shaft to the distal end of the inner shaft; and
a retraction controller comprising a housing that is fixed to the connector such that the housing is spaced apart from the outer shaft by the connector, the retraction controller comprising rotary driver elements having the inner shaft positioned therebetween such that the inner shaft spaces teeth of one of the rotary driver elements apart from teeth of another one of the rotary driver elements as the rotary driver elements rotate, the rotary driver elements being positioned within the housing and configured to move the inner shaft relative to the outer shaft in opposite first and second directions to secure a relative position between the inner shaft and the outer shaft, the reaction controller comprising a lock configured to fix the relative position between the inner shaft and the outer shaft when the inner shaft is fully extended and fully retracted relative to the outer shaft, the distal end of the inner shaft being positioned entirely within the interior lumen when the inner shaft is fully retracted, the housing including a proximal wall and a passageway extending through the proximal wall, the inner shaft extending through the passageway, the proximal end of the inner shaft comprising a stop having a diameter larger than a diameter of the passageway to limit extension of the inner shaft relative to the outer shaft,
wherein the retraction controller is configured to itself rotate to rotate the inner shaft such that the inflatable structure wraps around the inner shaft.

17. A device as recited in claim 16 , wherein a distal end of the inflatable structure is permanently fixed with the distal end of the outer shaft and the distal end of the inner shaft such that the distal end of the inner shaft protrudes beyond the distal end of the inflatable structure and the inflatable structure forms a single inflated portion.

18. A device as recited in claim 16 , wherein the inner shaft defines an inflation lumen that terminates at the distal end of the inner shaft.

Assignees

• Medtronic Holding Co Sarl

Inventors

• Druma Calin
• Chabansky Bruce

Classifications

• A61B17/8805

  for introducing fluid filler into bone or extracting it (A61B17/7097, A61B17/8833 take precedence) · CPC title

• A61B17/8855 Primary

  inflatable, e.g. kyphoplasty balloons · CPC title

• A61M25/0119

  Eversible catheters · CPC title