Instrument With A Two-Part Plunger For Subcutaneous Implantation

• US 20100324578A1
• Filed: 07/14/2010
• Published: 12/23/2010
• Est. Priority Date: 08/24/2000
• Status: Active Grant

• Current Assignee: Cardiac Science Operating Company (Cardica Incorporated)
• Original Assignee: Gust H. Bardy
• Inventors: Bardy, Gust H.
• Granted Patent: US 8,323,232 B2
• Time in Patent Office: Days
• US Class Current: 606/167
• CPC Class Codes: A61B 2560/063 Devices specially adapted for delivering implantable medical measuring apparatus
• CPC Class Codes: A61M 37/0069 Devices for implanting pellets, e.g. markers or solid medicaments for introducing of radioactive sources for interstitial radiation therapy, i.e. brachytherapy A61N5/1027

Abstract

An instrument with a two-part plunger for subcutaneous implantation is provided. An incising body defines a non-circular coaxial bore and includes a cutting edge formed on a distal end. A two-part plunger is non-fixedly contained within the coaxial bore and includes a tongue blade assembly and a plunger assembly. The tongue blade assembly is provided on a bottom surface of the coaxial bore and includes a tongue blade shaft and a thin tongue blade with a sharpened clearing edge on a distal end. The tongue blade assembly has a length exceeding the coaxial bore. The plunger assembly has a length exceeding the coaxial bore and includes a plunger shaft and a plunger affixed on a distal end. The plunger is slidably positioned on a top surface of the tongue blade.

Claims

1. An instrument with a two-part plunger for subcutaneous implantation, comprising:

an incising body defining a non-circular coaxial bore and comprising a cutting edge formed on a distal end; and

a two-part plunger non-fixedly contained within the coaxial bore and sliding longitudinally therein, comprising;

a tongue blade assembly provided on a bottom surface of the coaxial bore and comprising a tongue blade shaft and a flat thin tongue blade comprising a sharpened clearing edge on a distal end, the tongue blade assembly having a length exceeding the coaxial bore; and

a plunger assembly having a length exceeding the coaxial bore and comprising a plunger shaft and a plunger affixed on a distal end, the plunger slidably positioned on a top surface of the tongue blade.

2. An instrument according to claim 1, further comprising:

one or more corresponding guide tracks formed on at least two of the plunger shaft, tongue blade shaft, and incising body.

3. An instrument according to claim 1, further comprising:

at least two support shelves affixed to an inner surface of the bore, wherein the tongue blade assembly is located above the support shelves and the plunger assembly is located below the support shelves.

4. An instrument according to claim 1, further comprising:

a cover pivotably affixed to a top surface of the incising body on a distal end, wherein the cover prevents access to the bore in a closed position and provides access to the bore in an open position.

5. An instrument according to claim 1, wherein the cutting edge comprises one of a flat blade, a right triangle blade, an arrowhead blade, a triangle blade, and a convex triangle blade.

6. An instrument according to claim 1, wherein the tongue blade assembly and the plunger assembly slidably travel through the bore of the incising body until the tongue blade and the plunger are enclosed within the bore of the incising body in a retracted position.

7. An instrument according to claim 1, wherein the tongue blade assembly and the plunger assembly slidably travel through the bore of the incising body until handles affixed on proximal ends of the tongue blade shaft and the plunger shaft contact a proximal end of the incising body in a deployed position.

8. An instrument according to claim 1, further comprising:

one or more notches extending at least one of inward or outward from an outer surface of the incising body.

9. An instrument according to claim 1, wherein the sharp clearing edge continues around a periphery of the blade.

10. An instrument with a stacked two-part plunger for subcutaneous implantation, comprising:

an incising body defining a non-circular coaxial bore and comprising a cutting edge formed on a distal end; and

a stacked two-part plunger contained within the coaxial bore and sliding longitudinally therein, comprising;

a tongue blade assembly provided on a bottom surface of the coaxial bore and comprising a straight tongue blade shaft and a flat thin tongue blade comprising a sharpened clearing edge on a distal end, the tongue blade assembly having a length exceeding the coaxial bore; and

a plunger assembly provided above the tongue blade assembly and comprising a plunger shaft and a plunger affixed on a distal end, the plunger assembly having a length exceeding the coaxial bore.

11. An instrument according to claim 10, further comprising:

a cover pivotably affixed to a top surface of the incising body on a distal end, wherein the cover prevents access to the bore in a closed position and provides access to the bore in an open position.

12. An instrument according to claim 10, further comprising:

one or more corresponding guide tracks formed on at least two of the plunger shaft, tongue blade shaft, and incising body.

13. An instrument according to claim 10, further comprising:

a safety stop affixed on a top surface of the incising body on a distal end.

14. An instrument with a side-by-side two-part plunger for subcutaneous implantation, comprising:

an incising body defining a non-circular coaxial bore and comprising a cutting edge formed on a distal end; and

a side-by-side two-part plunger contained within the coaxial bore and sliding longitudinally therein, comprising;

a tongue blade assembly provided on a bottom surface of the coaxial bore and comprising a straight tongue blade shaft and a flat thin tongue blade comprising a sharpened clearing edge on a distal end; and

a plunger assembly comprising a plunger shaft and a plunger affixed on a distal end and provided adjacent to the tongue blade assembly such that the tongue blade shaft moves longitudinally along side the plunger shaft and the plunger longitudinally moves above the tongue blade.

15. An instrument according to claim 14, further comprising:

a cover pivotably affixed to a top surface of the incising body on a distal end, wherein the cover prevents access to the bore in a closed position and provides access to the bore in an open position.

16. An instrument according to claim 14, further comprising:

one or more corresponding guide tracks formed on at least two of the plunger shaft, tongue blade shaft, and incising body.

17. An instrument according to claim 14, further comprising:

a safety stop affixed on a top surface of the incising body on a distal end.

18. An instrument with a captive two-part plunger for subcutaneous implantation, comprising:

an incising body, comprising;

an incising shaft defining a cavity located along a longitudinal axis and comprising a cutting edge formed on a distal end; and

a syringe body defining a bore extending along the longitudinal axis and comprising a circumference smaller than the cavity, the syringe body positioned on a proximal end of the incising shaft with the bore aligned with a portion of the cavity; and

a two-part plunger fixedly contained within the coaxial bore and sliding longitudinally therein, comprising;

a tongue blade assembly comprising a tongue blade shaft sized to fit within the bore and affixed on one end to a flat thin tongue blade comprising a sharpened clearing edge defined on a distal end and sized to fit in the cavity, the tongue blade assembly having a length exceeding the coaxial bore; and

a plunger assembly comprising a plunger shaft sized to fit within the syringe body and affixed on one end to a plunger comprising a captive member and that is sized to fit in the cavity.

19. An instrument according to claim 18, further comprising:

a cover pivotably affixed to a top surface of the incising shaft on a distal end, wherein the cover prevents access to the bore in a closed position and provides access to the bore in an open position.

20. An instrument according to claim 18, further comprising:

one or more corresponding guide tracks formed on at least two of the plunger shaft, tongue blade shaft, and incising body.