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US 12,685,847 B2Granted
High pressure inflation device
AssigneeMerit Medical Systems, Inc.
InventorsJon Davis, Dan O'Neill, Taylor Beard, Michael Dean Haslam, Richard P. Jenkins, Dallin Romney
Life of this patent
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Abstract
Devices used to pressurize, depressurize, or otherwise displace fluid are disclosed. The devices may be configured to displace fluid in order to inflate or deflate a medical device, such as a balloon. The devices further include features and mechanisms for limiting pressure generation so as to avoid damage due to overpressurization.
Claims20
An inflation device, comprising:
- a syringe body;
- a plunger comprising a plunger shaft and a plunger tip and configured for advancement and retraction within the syringe body;
- a fluid reservoir defined by an interior surface of the syringe body and the plunger tip;
- plunger threads disposed on the plunger;
- and
- a coupling member having an inner surface within which a number of coupling member threads are disposed, wherein said coupling member threads are configured to engage the plunger threads,
- wherein the number is selected so that rotation of the plunger in a direction relative to the coupling member advances the plunger within the syringe body through engagement of the coupling member threads and the plunger threads, and increases a pressure within the fluid reservoir until a threshold pressure is reached, and
- wherein when the threshold pressure is reached, further rotation of the plunger in said direction causes disengagement of the plunger threads from the coupling member threads, preventing further advancement of the plunger.
5 more elements
An inflation device, comprising:
- a syringe body;
- a plunger comprising a plunger shaft and a plunger tip and configured for advancement and retraction within the syringe body;
- a fluid reservoir defined by an interior surface of the syringe body and the plunger tip;
- plunger threads disposed on the plunger;
- a coupling member surrounding the plunger shaft and comprising:
- a retainer ring fixedly coupled to the syringe body;
- a threaded insert situated concentrically within the retainer ring and having an inner surface comprising coupling member threads configured to engage the plunger threads;
- and
- a torque limiting mechanism configured to hold the threaded insert stationary when a torque applied to the plunger shaft is below a threshold value, and to allow the threaded insert to rotate with the plunger shaft when the torque equals or exceeds the threshold value,
- wherein rotation of the plunger when the threaded insert is stationary advances the plunger within the syringe body through engagement of the coupling member threads and the plunger threads, and increases a pressure within the fluid reservoir.
7 more elements
A plunger for adjusting pressure in an inflation device, comprising:
- a plunger shaft having a distal end comprising a plurality of distally extending flex arms radially arranged around a longitudinal axis of the plunger shaft, wherein each flex arm includes a barb extending radially therefrom;
- a plunger tip configured to be secured to the distal end of the plunger shaft, said plunger tip comprising:
- a tip body encompassing a bore configured to receive the distal end of the plunger shaft;
- a plurality of notches extending radially from the bore and configured to admit and retain the barbs when the flex arms are fully inserted within the bore;
- a spreader element situated in a distal end of the bore, configured to spread the flex arms when the flex arms are inserted within the bore to secure the barbs in the notches.
2 more elements
Dependencies are inferred from the claim text.