Gas inflation/evacuation system incorporating a reservoir and removably attached sealing system for a guidewire assembly having an occlusive device

• US 20060064071A1
• Filed: 12/10/2004
• Published: 03/23/2006
• Est. Priority Date: 11/06/2001
• Status: Abandoned Application

• Current Assignee: Medrad Incorporated (Bayer AG)
• Original Assignee: Possis Medical, Inc. (Bayer AG)
• Inventors: Bonnette, Michael J., Prather, Richard R., Thor, Eric J., Dutcher, Robert G.
• Application Number:
  US11/009,810
• Publication Number:
  US 20060064071A1
• Time in Patent Office: Days
• US Class Current: 604/500
• CPC Class Codes: A61M 2025/09008 having a balloon
• CPC Class Codes: A61M 2025/1052 for temporarily occluding a vessel for isolating a sector
• CPC Class Codes: A61M 25/09 Guide wires
• CPC Class Codes: A61M 25/1018 Balloon inflating or inflation-control devices
• CPC Class Codes: A61M 25/10182 Injector syringes
• CPC Class Codes: A61M 25/10185 Valves

Abstract

A gas inflation/evacuation system incorporating a reservoir and removably attached sealing system for a guidewire assembly having an occlusive device and method. A gas inflation/evacuation system is removably connectible to a proximal portion of a guidewire assembly where a sealing system interfaces and cooperatively interacts between the gas inflation/evacuation system and the proximal portion of the guidewire assembly to provide for repeated inflation and deflation of an occlusive balloon to provide a hubless guidewire assembly over which ablation and other type catheters can be loaded.

Claims

1. A gas inflation/evacuation system for a catheter guidewire assembly defining a lumen and having a proximal portion and a distal portion having an occlusive device, the gas inflation/evacuation system comprising:

a. a reservoir; and

,

b. a removably attached sealing system for interfacing and cooperatively interacting with the proximal portion and lumen of the catheter guidewire assembly having the occlusive device.

2. The gas inflation/evacuation system of claim 1, wherein the reservoir includes a biocompatable gas.

3. The gas inflation/evacuation system of claim 2, wherein the biocompatable gas is selected from the group consisting of carbon dioxide, helium, and nitrous oxide.

4. A gas inflation/evacuation system for a guidewire assembly having a proximal portion and a distal end and defining a guidewire lumen with an occlusive balloon located proximate the distal end of the guidewire assembly and communicating with the guidewire lumen, the gas inflation/evacuation system comprising:

a. a first syringe arrangement having an evacuation syringe for selectively evacuating the guidewire lumen;

b. a reservoir arrangement for supply of an abundance of biocompatable gas inflation medium from a reservoir for multiple inflations of the occlusive balloon;

c. a second syringe arrangement including an inflation syringe which selectively communicates with the reservoir for biocompatable gas inflation medium supply and which selectively introduces biocompatable gas inflation medium into the guidewire lumen to inflate the occlusive balloon in fluid communication with the guidewire lumen of the guidewire assembly; and

,

d. a compression sealing mechanism removably connected to the proximal portion of the guidewire assembly to provide a sealed interface between the guidewire lumen of the guidewire assembly and the first and second syringe assemblies where such sealed interface is suitably sealed to allow inflation of the occlusive balloon.

5. The gas inflation/evacuation system of claim 4, wherein the proximal portion of the guidewire assembly includes a proximally located extended sealable section, and wherein the compression sealing mechanism can seal around multiple elongated elements that puncture a seal residing in the compression sealing mechanism so that the compression sealing mechanism can be used a plurality of times without replacing internal seals of the compression sealing mechanism.

6. The gas inflation/evacuation system of claim 5, wherein the compression sealing mechanism may be used to seal around the extended sealable section of the guidewire of the guidewire assembly that cooperates with the gas inflation/evacuation system located proximal to the seal located internally within the compression sealing mechanism.

7. The gas inflation/evacuation system of claim 6, wherein the sealing system also includes an inflation tube sealing/crimping mechanism which accommodatingly receives the proximal portion of the guidewire assembly including the extended sealable section for crimping and sealing during use of the invention.

8. The gas inflation/evacuation system of claim 7, wherein the inflation tube sealing/crimping mechanism also can sever the crimped sealed section of the guidewire subsequent to desired inflation of the occlusive balloon at the distal location on the guidewire to maintain the occlusive balloon in an inflated state and to present a proximal guidewire end unencumbered by external interfering structure suitable for accommodation of a catheter, a hub or other such devices requiring the use of guidance to a vascular site requiring the removal of thrombus, lesion, or plaque.

9. The gas inflation/evacuation system of claim 8, wherein the portion of the crimped sealed section immediately distal of the crimped sealed portion can be cut to open communication to the lumen, thereby allowing the occlusive balloon to readily deflated.

10. The gas inflation/evacuation system of claim 9, wherein the remaining intact proximal portion of the guidewire can subsequently be reinserted into the seal to re-engage the gas inflation/evacuation system for another inflation of the occlusive balloon, whereby the seal effectively seals around the remaining extended sealable section of the guidewire assembly.

11. The gas inflation/evacuation system of claim 4, wherein the compression sealing mechanism can be removably connected to the proximal portion of the guidewire assembly between two and ten times.

12. The gas inflation/evacuation system of claim 4, wherein the compression sealing mechanism can be removably connected to the proximal portion of the guidewire assembly at least three times.

13. The gas inflation/evacuation system of claim 10, wherein the seal is compressed by an assembly of axially related backing or retaining members that include sealing surfaces that contact the seal and apply a compressive force to the seal.

14. The gas inflation/evacuation system of claim 13, wherein the compressive force is generated by a threaded member such as nuts, caps, screw followers, and sealing glands or is generated by springs, tensioned parts, and biased members.

15. The gas inflation/evacuation system of claim 13, wherein the seal is formed of a resilient material.

16. The gas inflation/evacuation system of claim 13, wherein the seal has a thickness of from about 0.030 inch to about 0.200 inch.

17. The gas inflation/evacuation system of claim 4, wherein the inflation syringe is appropriately sized to contain just enough inflation medium to inflate the occlusive balloon so as to minimize the volume of biocompatable gas in the gas inflation/evacuation system in the event of a leak.

18. The gas inflation/evacuation system of claim 4, further comprising:

a. at least one check valve to prevent undesired communication direction;

b. a pressure gauge to monitor pressure; and

,

c. at least one positionable valve.

19. A method of controlling an occlusive balloon on a guidewire assembly comprising the steps of:

a. providing a gas inflation/evacuation system for a guidewire assembly having a proximal portion and a distal end and defining a guidewire lumen with an occlusive balloon located proximate the distal end of the guidewire assembly and communicating with the guidewire lumen, the gas inflation/evacuation system including;

(1) a first syringe arrangement having an evacuation syringe for selectively evacuating the guidewire lumen;

(2) a reservoir arrangement for supply of an abundance of biocompatable gas inflation medium from a reservoir for multiple inflations of the occlusive balloon;

(3) a second syringe arrangement including an inflation syringe which selectively communicates with the reservoir for biocompatable gas inflation medium supply and which selectively introduces biocompatable gas inflation medium into the guidewire lumen to inflate the occlusive balloon in fluid communication with the guidewire lumen of the guidewire assembly; and

,

(4) a compression sealing mechanism removably connected to the proximal portion of the guidewire assembly to provide a sealed interface between the guidewire lumen of the guidewire assembly and the first and second syringe assemblies where such sealed interface is suitably sealed to allow inflation of the occlusive balloon;

b. inflating the occlusive balloon with the second syringe arrangement and crimp sealing the proximal portion of the guidewire assembly and separating the gas inflation/evacuation system from the guidewire assembly;

c. severing the crimp sealed proximal portion and evacuating the occlusive balloon; and

,

d. re-inflating the occlusive balloon with the second syringe arrangement and re-crimp sealing the proximal portion of the guidewire assembly.

20. The method of claim 19, wherein the step of evacuating the occlusive balloon is preceded by a step of:

a. reinserting the severed proximal portion into the compression sealing mechanism of the inflation/evacuation system; and

,

wherein the step of evacuation is characterized by a deflation rate of the occlusive balloon being increased by employing the first syringe arrangement.