Thomas Hartman Chun

US Patent:

8303541, Nov 6, 2012

Filed:

Jun 24, 2010

Appl. No.:

12/822699

Inventors:

Thomas Chun - Northridge CA, US

International Classification:

A61M 5/00

US Classification:

604110, 604198, 604263

Abstract:

Protection for the otherwise exposed sharp point of a needle of an injection device. A two part cover for the needle comprises a stationary base which engages the injection device, and a relatively movable cover. The cover is guided to slide longitudinally along the base by a groove-and-projection system. The projection is held in an initial position, and slides along the groove during injection. At the end of the injection, the projection is immobilized in the groove at a final position, and immobilizes the moveable cover in a deployed position covering the needle.

US Patent:

20080287869, Nov 20, 2008

Filed:

May 17, 2007

Appl. No.:

11/750327

Inventors:

Thomas Chun - Northridge CA, US

International Classification:

A61M 5/00
A61M 5/32

US Classification:

604110, 604195, 604196

Abstract:

A safety syringe that includes syringe assembly retained within a hollow tubular shell, whereby a retaining member is utilized for retaining the syringe assembly in an operative position such that it is available for administering a shot. After the safety syringe is used, a retracting assembly retracts the syringe assembly into the shell and locks it in place thereby preventing any accidental pricks.

US Patent:

20090005737, Jan 1, 2009

Filed:

Jun 29, 2007

Appl. No.:

11/770738

Inventors:

Thomas Chun - Northridge CA, US

International Classification:

A61M 5/20

US Classification:

604157, 604263

Abstract:

An auto-injector that includes a hollow tubular shell to retain the internal structure and provide a surface to be held by the user; a trigger for activating the auto-injector; a plunger lock for slideably inserting into the trigger and for retaining a plunger in the operative position prior to use; and, a syringe assembly comprising a hollow tubular barrel for slideably receiving the plunger, such that when the trigger is activated the syringe assembly is activated and the injection is automatically administered.

US Patent:

20100274184, Oct 28, 2010

Filed:

Apr 24, 2009

Appl. No.:

12/429985

Inventors:

Thomas Chun - Northridge CA, US

International Classification:

A61M 5/31

US Classification:

604 84

Abstract:

An injection device such as a syringe, which has a helical flow path for a solution in which the solvent and solute have been introduced. The helical flow path is formed by a helically configured member which has general overall configuration of a helical coil spring. Individual coils may be formed to have a groove located along the length of the helix. When compressed, the novel member effectively takes on a cylindrical outer configuration. Because the groove is covered and sealed by the surface of the next turn of the helix when compressed, an enclosed helical flow path is formed in the compressed member. The invention may be an injection device using the novel flow path forming member or alternatively, the flow path forming member itself.

US Patent:

20100274185, Oct 28, 2010

Filed:

Apr 28, 2009

Appl. No.:

12/431144

Inventors:

Thomas Chun - Northridge CA, US

International Classification:

A61M 5/31
A61M 5/20
A61M 5/32

US Classification:

604 89, 604135

Abstract:

An apparatus for actuating a syringe. The syringe includes a barrel, a plunger and a needle. A needle shield is near the front of the barrel and is movable from a first position enclosing the needle and a retracted position wherein the needle is exposed. A spring abuts the plunger. A cap has an interior wall for engaging the spring and releasably engages the plunger. The spring is compressed between the plunger and the interior wall when the cap releasably engages the plunger. A resilient member releasably secures the cap in releasable engagement with the plunger and is movable from a first position to a compressed position when the needle shield is moved from its first position to its retracted position. The cap disengages the plunger when the resilient member is moved to the compressed position wherein the spring expands to provide a medicament delivery pressure to the plunger.

US Patent:

20100324480, Dec 23, 2010

Filed:

Jun 17, 2009

Appl. No.:

12/486356

Inventors:

Thomas Chun - Northridge CA, US

International Classification:

A61M 5/31
A61M 5/20

US Classification:

604 89, 604135

Abstract:

An apparatus for applying medicament delivery pressure to a plunger pad of a plunger of a syringe includes a spring having a first end and a second end, wherein the spring first end is operable to abut the plunger pad. The assembly also includes a shell including an interior and a first step therein. A cap is disposed within the shell interior. The cap includes a surface for engaging the spring second end. The cap is movable from a first position, wherein the shell first step retains the cap in releasable engagement with the plunger such that the spring is compressed between the cap surface and plunger pad, and a second position, wherein the cap disengages the shell first step such that the cap disengages the plunger such that the spring expands to move the barrel and needle forward as well as deliver medicament delivery pressure to the plunger pad.

US Patent:

20110319833, Dec 29, 2011

Filed:

Jun 24, 2010

Appl. No.:

12/822717

Inventors:

THOMAS CHUN - Northridge CA, US

International Classification:

A61M 5/32

US Classification:

604198

Abstract:

A self-deploying cover for protection against unintended pricks from injection devices. The cover comprises a base which engages the injection device, and a protective sleeve which covers the sharp point and moves relative to the base to expose and cover the sharp point. The sleeve is guided by a projection which rides within a generally V-shaped groove formed in the base. The groove comprises deflectable arms which deflect to pass the projection, but which oppose return of the projection after passing. The sleeve is spring urged to the extended position and is automatically withdrawn during injections. After an injection, the sleeve is locked into the extended position by the last deflectable arm.

US Patent:

20120123349, May 17, 2012

Filed:

Nov 15, 2010

Appl. No.:

12/946089

Inventors:

Thomas Chun - Northridge CA, US

International Classification:

A61M 5/32

US Classification:

604198

Abstract:

A guard for the sharp tip of a needle of an injection syringe. The guard may comprise two components which are separate from and readily attachable to the syringe. One component is stationary and the other movable relative to the syringe. The movable member moves by expanding longitudinally to cover the otherwise exposed needle tip when the plunger of the syringe is depressed beyond a predetermined degree. The stationary member releasably holds the movable member in the initial position, and releases the movable member to expand and thus deploy when the predetermined degree of depression is imposed by the user of the syringe.