Chris Jo Christiansen

US Patent:

6551290, Apr 22, 2003

Filed:

Mar 31, 2000

Appl. No.:

09/540444

Inventors:

Dennis D. Elsberry - Plymouth MN
Chris Christiansen - Oakdale MN
Mary M. Morris - Mounds View MN
Douglas Owen Hankner - Fridley MN
Robert Cushing Hamlen - Edina MN

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61M 2500

US Classification:

604284, 604173, 604 9301

Abstract:

A medical catheter comprising a proximal end having an opening for fluid containing a therapeutic drug, a distal end, the distal end defining at least one opening, and a porous portion covering the opening defined by the distal end. In one embodiment, the medical catheter comprises a proximal end having an opening for fluid containing a therapeutic drug, at least two distal ends. the proximal end connected to the two distal ends with a connector, the distal ends each defining at least, one opening, a diffuser covering the opening of each distal end, and a separate restrictor downstream of the connector and upstream of each distal end to provide substantially equal flow through each distal end. An additional restrictor can also be placed upstream of the connector. In another embodiment, a combination diffuser and restrictor covers the opening of each distal end.

US Patent:

6635049, Oct 21, 2003

Filed:

Apr 30, 1999

Appl. No.:

09/303790

Inventors:

Reginald D. Robinson - Plymouth MN
Mark Lent - Brighton Park MN
Chris C. Christiansen - Oakdale MN

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61K 922

US Classification:

6048911, 604 66, 604132

Abstract:

An bolus delivery system includes an implantable pump, a sensor for sensing an adverse patient condition, such as atrial fibrillation, and a catheter for delivery of a bolus of drug to a target area of a living body. The pump is provided with a bolus metering assembly which includes, in a preferred embodiment, an auxiliary bellows defining a bolus reservoir in addition to the main reservoir of the pump. The auxiliary bellows is selectively placed in fluid communication with the pressurized main supply of drug via an inlet valve to refill the bolus reservoir. An outlet valve is provided to permit egress of the bolus to the catheter from the bolus reservoir. A drive train including a stepper motor and a face cam selectively opens and closes the inlet and outlet valves to effect accumulation or metering and delivery of the bolus. The auxiliary bellows is preferably provided as a collapsible element resiliently biased to an expanded position and is collapsed under pressure in the main reservoir to expel the bolus.

US Patent:

6663609, Dec 16, 2003

Filed:

Oct 22, 2001

Appl. No.:

10/014634

Inventors:

Shobha Devi Williamson - Minneapolis MN
Chris C. Christiansen - Oakdale MN
Laura Sue McWilliam - Farmington Hills MI

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61M 3100

US Classification:

60428801, 604 9301, 604175, 604500, 128 12

Abstract:

A device and method configured for placement into the catheter access port to prevent insertion of a needle into the catheter access port. The device a prong to engage the housing and lock itself in the catheter access port, an annular surface having geometry complimentary to the catheter access port to seal the denial device, and a face configured to deny needle access to the catheter access port. The device is also self sealing to substantial prevent deposition between itself and the catheter access port, is configured to be inserted without the need for tools, and is manufactured from biocompatible material. The method for inserting this device consists of aligning the device with the catheter access port, inserting the device, confirming it is in place, and sealing it into the catheter access port.

US Patent:

6685452, Feb 3, 2004

Filed:

Aug 9, 2001

Appl. No.:

09/925598

Inventors:

Chris C. Christiansen - Oakdale MN 55128
James M. Olsen - Plymouth MN 55442

Assignee:

Chris C. Christiansen - Oakdale MN
James M. Olsen - Plymouth MN

International Classification:

F04B 3900

US Classification:

417572, 6048911

Abstract:

A human body implantable drug delivery pump has a housing including at least a first shield and a second shield. The housing defines an interior within the shields. The pump further includes a fluid reservoir within the housing, a fluid conduit also within the housing from the reservoir, an outlet from the fluid conduit to the exterior of the housing, and a pump member in the housing adapted to move fluid through the fluid conduit to the outlet. The fluid in the reservoir and fluid conduit is isolated from the pump interior. The pump further has a desiccant in the pump interior, the desiccant absorbent of moisture in the pump interior, and preferably absorbent of substantially all the moisture in the pump interior. The desiccant also preferably has a moisture absorbent property dependent on temperature, being lessened at higher temperatures, the desiccant being pre-baked to improve its moisture absorbent property before being placed in the pump.

US Patent:

8473057, Jun 25, 2013

Filed:

Oct 30, 2009

Appl. No.:

12/609901

Inventors:

William T. Donofrio - Andover MN, US
William J. Havel - Maple Grove MN, US
Chris C. Christiansen - Oakdale MN, US
Paul G. Krause - Shoreview MN, US

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61N 1/375

US Classification:

607 36

Abstract:

Techniques for minimizing interference between first and second medical devices of a therapy system may include providing an outer housing for at least one of the medical devices that comprises an electrically insulative layer formed over at least the electrically conductive portions (e. g. , an electrically conductive layer) of the housing, or providing an electrically insulative pouch around an electrically conductive housing of at least the first medical device. The electrically insulative layer or electrically insulative pouch may reduce or even eliminate shunt-current that flows into the medical device via the housing. The shunt-current may be generated by the delivery of electrical stimulation by the second medical device. In some examples, the techniques may also include shunt-current mitigation circuitry that helps minimize or even eliminate shunt-current that feeds into the first medical device via one or more electrodes electrically connected to the first medical device.

US Patent:

55518494, Sep 3, 1996

Filed:

Apr 29, 1994

Appl. No.:

8/235436

Inventors:

Chris C. Christiansen - Oakdale MN

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

F04B 45033
A61M 5152

US Classification:

417472

Abstract:

A medication delivery device having a reduced weight due to the configuration of the end terminal of the pleated bellows reservoir. The end terminal includes an indented portion which is sized such that when the reservoir is in the compressed/empty position there is substantially no separation between the indented portion and the base portion of the reservoir. This construction allows the reservoir to be almost completely emptied of medication when the reservoir is collapsed but does so in a manner which does not add to the weight of the device.

US Patent:

54434505, Aug 22, 1995

Filed:

Apr 29, 1994

Appl. No.:

8/235442

Inventors:

Paul S. Kratoska - Brooklyn Park MN
Chris C. Christiansen - Oakdale MN

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61M 5152

US Classification:

604141

Abstract:

A medication delivery device having a particularly compact size due to the bulged configuration of the cover. The device includes a housing having a base and a cover. The cover includes a side portion and a substantially planer surface joined by a curved portion. The curved portion is bulged outwardly in a manner such that the area of the internal cavity bounded by the side portion, the substantially planer surface and the base includes substantially all of the area which would be formed if the side portion and the substantially planer surface were extended and joined in the absence of the curved portion. This enables the entire vertical space of the internal cavity to be utilized and allows the thickness of the device to be minimized.

US Patent:

62280503, May 8, 2001

Filed:

Apr 30, 1999

Appl. No.:

9/303006

Inventors:

James M. Olsen - Plymouth MN
Reginald D. Robinson - Plymouth MN
Chris Christiansen - Oakdale MN
Paul Kratoska - Brooklyn Park MN

Assignee:

Medtronic Inc. - Minneapolis MN

International Classification:

A61M 1100

US Classification:

604 9301

Abstract:

The displacement of refill valves in an implantable drug delivery device is reduced to permit the housings of a drug delivery device to remain compact in size while permitting reservoirs of increased depth to be used. In a preferred embodiment, a collapsible link is provided as a telescoping member incorporating a coil spring. As the valve is pulled into contact with its seat, a detectable pressure increase is sensed in the refill device. In accordance with the invention, as the drug supply contained in the reservoir depletes, the reservoir surface moves towards a collapsed position, compressing the coil spring and eventually contacting the valve stem, thereby lifting the valve from its seat. By virtue of telescoping link, the valve stem length and therefore the valve travel may be reduced as compared to prior art devices, thus eliminating the need for increased housing depth when deeper reservoirs are used. The collapsible link may be comprised of a second spring combined with a telescoping link.

Address:

4641 Hillvale Cir N, Saint Paul, MN 55128

Phone:

(651)7738223

VIN:

1VWBP7A3XCC088139

Make:

VOLKSWAGEN

Model:

PASSAT

Year:

2012