Agent delivery devices

Patent metadata

Field	Value
Publication number	US-12097359-B2
Application number	US-202017139139-A
Country	US
Kind code	B2
Filing date	Dec 31, 2020
Priority date	Jan 6, 2020
Publication date	Sep 24, 2024
Grant date	Sep 24, 2024

Abstract

A medical device may comprise a flexible sheath defining a lumen extending from a proximal end of the sheath to a distal end of the sheath. The sheath may include a piston slidably received within the lumen; an agent disposed in the lumen distal to the piston; and pneumatic fluid disposed in the lumen proximal of the piston. The device may also comprise handle at a proximal end of the sheath, the handle including: a plunger received in a reservoir, wherein the reservoir is in fluid communication with the lumen. The reservoir may contain pneumatic fluid. The handle may also include a gear. An amount of rotation of the gear in a first direction may correspond to an amount that the plunger advances distally in the reservoir to displace pneumatic fluid. The displacement of the pneumatic fluid may advance the piston distally to deliver an amount of agent from the sheath.

First claim

We claim:

1. A medical device comprising:
a flexible sheath defining a lumen extending from a proximal end of the sheath to a distal end of the sheath, and wherein the sheath includes:
a piston slidably received within the lumen;
an agent disposed in the lumen distal to the piston; and
a pneumatic fluid disposed in the lumen proximal of the piston; and

a handle at a proximal end of the sheath, the handle including:
a plunger received in a reservoir, wherein the reservoir is in fluid communication with the lumen, and wherein the reservoir contains the pneumatic fluid; and
a gear, wherein an amount of rotation of the gear in a first direction corresponds to an amount that the plunger advances distally in the reservoir to displace the pneumatic fluid, and wherein the displacement of the pneumatic fluid advances the piston distally to deliver an amount of the agent from the sheath.

2. The medical device of claim 1 , wherein the gear is fixed to a rotatable shaft.

3. The medical device of claim 2 , wherein a first nut is received within a cavity of the shaft and is fixed with respect to the shaft, wherein the plunger is received in a central opening of the first nut, and wherein the first nut has features configured to engage with features of the plunger.

4. The medical device of claim 3 , wherein the handle includes a second nut that is fixed with respect to the handle, wherein the plunger is received in a central opening of the second nut, and wherein the second nut has features configured to engage with the features of the plunger.

5. The medical device of claim 2 , wherein the shaft and the gear are rotatable via at least one of a knob or a lever.

6. The medical device of claim 2 , wherein the shaft is a first shaft, and further comprising:
a second shaft, wherein movement of the second shaft along a longitudinal axis of the second shaft in a second direction causes an end of the second shaft to exert a force on a tooth of the gear, causing rotation of the gear.

7. The medical device of claim 6 , wherein a spring is disposed about the second shaft, such that movement of the shaft in the second direction compresses the spring.

8. The medical device of claim 1 , wherein the gear is a ratcheted gear that provides tactile or auditory feedback regarding the amount of agent delivered.

9. The medical device of claim 1 , wherein the plunger is connected to a rack gear that extends approximately parallel to the plunger, and wherein the gear of the handle engages with the rack gear.

10. The medical device of claim 9 , wherein the gear is a ratcheted gear, wherein the ratcheted gear is fixed to a wheel that is configured to be contacted by a user, and wherein rotation of the wheel causes rotation of the ratcheted gear.

11. The medical device of claim 10 , wherein the rotation of the ratcheted gear causes movement of the rack gear in a distal direction along a longitudinal axis of the rack gear, and wherein the movement of the rack gear in the distal direction causes movement of the plunger in the distal direction.

12. The medical device of claim 11 , wherein the plunger is connected to the rack gear via a bridge, and where the bridge is contactable by a user such that a user may contact the bridge to advance the plunger in the distal direction.

13. The medical device of claim 1 , wherein the gear is a ratcheted gear, wherein the ratcheted gear is movable only in the first direction.

14. The medical device of claim 1 , wherein the sheath further includes a needle extending from the distal end of the sheath.

15. The medical device of claim 14 , wherein the needle is retractable.

16. A medical device comprising:
a flexible sheath defining a lumen extending from a proximal end of the sheath to a distal end of the sheath, and wherein the sheath includes:
a piston slidably received within the lumen;
an agent disposed in the lumen distal to the piston; and
a pneumatic fluid disposed in the lumen proximal of the piston; and

a handle, including:
a gear, wherein rotation of the gear causes displacement of the pneumatic fluid in a distal direction, advancing the piston distally to deliver an amount of the agent from the sheath; and
a ratchet lock configured to engage with the gear and to provide feedback to a user.

17. The medical device of claim 16 , wherein the gear is rotatable by at least one of:
a rotatable knob fixed to the gear; or
a shaft configured to be advanced in a first direction along a longitudinal direction of the shaft to exert a force on a tooth of the gear.

18. The medical device of claim 16 , wherein the gear is a circular gear, wherein the circular gear is configured to interact with a rack gear, and wherein the rack gear is fixed to a plunger extending approximately parallel to the rack gear.

19. A medical method, comprising:
inserting a flexible sheath into a body lumen of a patient, wherein the flexible sheath defines a lumen extending from a proximal end of the sheath to a distal end of the sheath, and wherein the sheath includes:
a piston slidably received within the lumen;
an agent disposed in the lumen distal to the piston; and
a pneumatic fluid disposed in the lumen proximal of the piston;
activating an actuator to displace the pneumatic fluid and deliver the agent from the sheath;
receiving auditory or tactile feedback from a ratcheted gear of the actuator; and
ceasing activation of the actuator when a predetermined amount of the agent has been delivered.

20. The medical method of claim 19 , wherein the auditory or tactile feedback indicates an amount of the agent delivered from the sheath.

Assignees

• Boston Scient Scimed Inc

Inventors

• King Joseph
• Pic Andrew
• Favreau John

Classifications

• A61M31/00

  Devices for introducing or retaining media, e.g. remedies, in cavities of the body (A61M25/00 takes precedence {; introducing or retaining ophthalmic products into the ocular cavities A61F9/0008}) · CPC title

• A61B1/015

  Control of fluid supply or evacuation · CPC title

• A61M2205/581

  by audible feedback · CPC title

• A61M5/14526

  the piston being actuated by fluid pressure · CPC title

• A61M5/1452

  pressurised by means of pistons · CPC title