Catheter introduction syringe

Claim 2

A catheter introduction syringe for the introduction of a catheter or catheter guide wire into a patient's body, said catheter introduction syringe comprises a hollow syringe barrel to support a needle thereon having a plunger slidably disposed therein, said plunger comprises a first and second plunger element including a first and second valve seat respectively to cooperatively form a valve recess to operatively house a valve assembly therein and a centrally disposed channel formed longitudinally therethrough including a first and second centrally disposed channels formed through said first and second plunger elements respectively, said first and second centrally disposed channels disposed on opposite sides of said valve assembly, said valve assembly comprises a first and second valve element each including a flexible resilient valve member having a normally closed centrally disposed slit formed therein disposed within said first and second valve seats respectively to cooperatively form a valve chamber therebetween and a rigid valve support element disposed within said valve chamber arranged to limit deflection of said first and second valve elements and to maintain the sealing integrity thereof, said valve assembly disposed in operative relationship relative to said centrally disposed channel to prevent passage of air or liquid therethrough during flushing or aspirating of said catheter introduction syringe and permit the introduction a catheter or catheter guide wire through centrally disposed channel, said hollow syringe barrel and needle for introduction into the patient's body without the flow of air or liquid through said centrally disposed channel.

Claim 3

The catheter introduction syringe of claim 1 wherein each said flexible resilient valve member comprise a hollow substantially hemispheric member.

Claim 4

The catheter introduction syringe of claim 1 wherein said rigid valve support element comprises a body having a centrally disposed channel formed therethrough.

Claim 5

The catheter introduction syringe of claim 3 wherein said first plunger element includes a conical alignment recess formed therein and said rigid valve support element includes a conical alignment recess formed adjacent said centrally disposed channel to cooperatively form a catheter alignment means.

Claim 6

The catheter introduction syringe of claim 4 wherein said catheter alignment means further includes a conical recess formed in said second centrally disposed channel.

Claim 7

The catheter introduction syringe of claim 5 wherein said catheter alignment means further includes a conically shaped outer end portion of said syringe barrel.

Claim 8

A catheter introduction syringe for the introduction of a catheter or catheter guide wire into a patient's body, said catheter introduction syringe comprises a hollow syringe barrel to support a needle thereon having a plunger slidably disposed therein, said plunger includes a centrally disposed channel formed longitudinally therethrough having a valve assembly including a first and second valve element disposed in operative relationship relative to said centrally disposed channel to prevent passage of air or liquid therethrough during flushing or aspirating of said catheter introduction syringe and permit the introduction of a catheter or catheter guide wire through said centrally disposed channel, said hollow syringe barrel and needle for introduction into the patient's body without the flow of air or liquid through said centrally disposed channel, said plunger comprises a first and second plunger element including a first and second valve seat respectively to receive said first and second valve element respectively to cooperatively form a valve chamber therebetween, said first valve element comprises a flexible resilient hollow substantially hemispheric member including a normally closed centrally disposed slit formed therein and a annular skirt spaced from and formed about the at least a portion of said first valve element and arranged to engage said first valve seat to limit deflection of said first valve element to maintain the sealing integrity thereof.

Claim 9

A catheter introduction syringe for the introduction of a catheter or catheter guide wire into a patient's body, said catheter introduction syringe comprises a hollow syringe barrel to support a needle thereon having a plunger slidably disposed therein, said plunger includes a centrally disposed channel formed longitudinally therethrough having a valve assembly including a first and second valve element disposed in operative relationship relative to said centrally disposed channel to prevent passage of air or liquid therethrough during flushing or aspirating of said catheter introduction syringe and permit the introduction of a catheter or catheter guide wire through said centrally disposed channel, said hollow syringe barrel and needle for introduction into the patient's body without the flow of air or liquid through said centrally disposed channel, said plunger comprises a first and second plunger element including a first and second valve seat respectively to receive said first and second valve element respectively to cooperatively form a valve chamber therebetween, said first valve element comprises a flexible resilient hollow substantially hemispheric member including a normally closed centrally disposed slit formed therein and a annular skirt spaced from and formed about the at least a portion of said first valve element and arranged to engage said first valve seat to limit deflection of said first valve element to maintain the sealing integrity thereof.

Claim 10

The catheter introduction syringe of claim 7 wherein said centrally disposed channel comprises a first and second centrally disposed channel formed through said first and second plunger elements respectively, said first and second centrally disposed channels are disposed on opposite sides of said valve assembly.

Claim 11

The catheter introduction syringe of claim 7 wherein said second valve element comprise a flexible resilient hollow tube forming a normally closed slit formed in the mid-portion thereof.

Claim 12

The catheter introduction syringe of claim 9 further including means to maintain the sealing integrity of said second valve element with said plunger.

Claim 13

The catheter introduction syringe of claim 10 wherein said syringe barrel and said plunger include a barrel vent and plunger vent respectively formed therethrough, and a plunger vent seal slidably mounted on said plunger to seal said plunger vent when said barrel vent is occluded and said plunger is retracted relative to said syringe barrel to creater a positive pressure within said second plunger element to maintain the sealing integrity of said second valve element.

Claim 14

The catheter introduction syringe of claim 9 wherein said first plunger element includes a conical alignment recess formed therein and said second centrally disposed channel includes a conical alignment to cooperatively form a catheter alignment means.

Claim 15

The catheter introduction syringe of claim 12 wherein said catheter alignment means further includes a conical recess formed in said second centrally disposed channel.

Claim 16

The catheter introduction syringe of claim 12 wherein said catheter alignment means further includes tapered alignment guide formed in said flexible resilient hollow tube adjacent said normally closed slit formed in said mid-portion thereof.

Claim 17

The catheter introduction syringe of claim 12 wherein said catheter alignment means further includes a conically shaped outer end portion of said syringe barrel.

Claim 18

A catheter introduction syringe for the introduction of a catheter or catheter guide wire into a patient's body, said catheter introduction syringe comprises a hollow syringe barrel to support a needle thereon having a plunger slidably disposed therein, said plunger comprises a first and second plunger element each including a countersunk recess to cooperatively form a valve recess to operatively house a valve assembly therein and a centrally disposed channel formed longitudinally therethrough including a first and second centrally disposed channels formed through said first and second plunger elements respectively, said first and second centrally disposed channels disposed on opposite sides of said valve assembly, said valve assembly comprises a rigid valve support element having a first and second valve seat formed on opposite ends of a centrally disposed channel formed therethrough to receive a first and second valve element respectively to cooperatively form a valve chamber therebetween, said first and second valve elements each comprises a flexible resilient valve member having a normally closed centrally disposed slit formed therein, said rigid valve support element disposed in surrounding relationship relative to said first and second valve elements to limit deflection of said first and second valve elements and to maintain the sealing integrity thereof, said valve assembly disposed in operative relationship relative to said centrally disposed channel to prevent passage of air or liquid therethrough during flushing or aspirating of said catheter introduction syringe and permit the introduction of a catheter or cathetr guide wire through said centrally disposed channel, said hollow syringe barrel and needle for introduction into the patient's body without the flow of air or liquid through said centrally disposed channel.

Claim 19

A catheter introduction syringe for the introduction of a catheter or catheter guide wire into a patient's body, said catheter introduction syringe comprises a hollow syringe barrel to support a needle thereon having a plunger slidably disposed therein, said plunger comprises a first and second plunger element each including a countersunk recess to cooperatively form a valve recess to operatively house a valve assembly therein and a centrally disposed channel formed longitudinally therethrough including a first and second centrally disposed channels formed through said first and second plunger elements respectively, said first and second centrally disposed channels disposed on opposite sides of said valve assembly, said valve assembly comprises a rigid valve support element having a first and second valve seat formed on opposite ends of a centrally disposed channel formed therethrough to receive a first and second valve element respectively to cooperatively form a valve chamber therebetween, said first and second valve elements each comprises a flexible resilient valve member having a normally closed centrally disposed slit formed therein, said rigid valve support element disposed in surrounding relationship relative to said first and second valve elements to limit deflection of said first and second valve elements and to maintain the sealing integrity thereof, said valve assembly disposed in operative relationship relative to said centrally disposed channel to prevent passage of air or liquid therethrough during flushing or aspirating of said catheter introduction syringe and permit the introduction of a catheter or cathetr guide wire through said centrally disposed channel, said hollow syringe barrel and needle for introduction into the patient's body without the flow of air or liquid through said centrally disposed channel.

Claim 20

The catheter introduction syringe of claim 16 wherein each said flexible resilient valve member comprise a hollow substantially hemispheric member.

Claim 21

The catheter introduction syringe of claim 16 wherein said first plunger element includes a conical alignment recess formed therein and said rigid valve support elements includes a conical alignment recess formed adjacent said centrally disposed channel to cooperatively form a catheter alignment means.

Claim 22

The catheter introduction syringe of claim 18 wherein said catheter alignment means further includes a conical recess formed in said second centrally disposed channel.

Claim 23

The catheter introduction syringe of claim 19 wherein said catheter alignment means further includes a conically shaped outer end portion of said syringe barrel.