Handpiece for fluid administration apparatus

• US 7,625,354 B2
• Filed: 11/11/2005
• Issued: 12/01/2009
• Est. Priority Date: 04/10/1998
• Status: Expired due to Fees

• Current Assignee: Milestone Scientific Incorporated
• Original Assignee: Milestone Scientific Incorporated
• Inventors: Hochman, Mark
• Primary Examiner(s): Lucchesi; Nicholas D
• Assistant Examiner(s): MEDWAY, SCOTT J
• Application Number:
  US11/271,563
• Publication Number:
  US 20060102174A1
• Time in Patent Office: 1,481 Days
• Field of Search: 604 65- 67, 604/118, 604/119, 604/121, 604/131, 604/890.1, 433 27- 29, 433/128, 285/1, 285/2, 285/3, 251/149
• US Class Current: 604/131
• CPC Class Codes: A61M 2205/3344 Measuring or controlling pressure at the body treatment site
• CPC Class Codes: A61M 5/1456 with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir
• CPC Class Codes: A61M 5/16854 by monitoring line pressure
• CPC Class Codes: Y10T 137/1632 Destructible element

Abstract

A handpiece assembly is provided that is adapted for use with a medication infusion system that applies pressure to the handpiece assembly for delivering medication to a body. The handpiece assembly includes a cartridge holder that is configured for disposal of a medication cartridge. A tubing is provided having a first end, which is sealed with the cartridge holder such that the cartridge holder facilitates communication between the tubing and the medication cartridge. A handpiece is sealed with a needle and the second end of the tubing so that the tubing and the needle are in communication. One of the cartridge holder, the tubing, the needle or the handpiece is configured for a selective structural failure at a predetermined pressure threshold applied to the handpiece assembly from the medication infusion system. The cartridge holder may be designed to facilitate aspiration.

Claims

1. A medication infusion system comprising:

a drive unit having a receptacle and being configured to apply pressure in a range of 200 psi to 650 psi, to a hand piece assembly for delivering medication to a body;

a disposable handpiece assembly detachably connected to the drive unit, the handpiece assembly comprising;

a cartridge holder being configured for disposal of a medication cartridge, the cartridge holder having an end for receiving a medication cartridge, the end of the cartridge holder having a plurality of wings and being connected with the receptacle of the medication infusion system by an interference fit of the wings inside the receptacle;

microbore tubing having a first end and a second end, the first end being fixedly sealed by bonding that is impermeable to leakage with the cartridge holder such that the cartridge holder facilitates communication between the tubing and the medication cartridge;

a needle assembly with a needle for injecting a patient'"'"'s tissue;

a handpiece being fixedly sealed by bonding that is impermeable to leakage with the needle assembly and by bonding that is impermeable to leakage with the second end of the tubing such that the tubing and the needle assembly are in communication;

the wings of the cartridge holder being connected to the end of the cartridge holder at wing junctions that have a reduced wall thickness configured for structural failure, such that the wing junctions break at a predetermined threshold in the range of 450 to 550 psi, as applied to the handpiece assembly from the medication infusion system, such that the interference fit between the wings and the receptacle fails at the predetermined pressure threshold and thereby disconnects the cartridge holder from the drive unit so that the drive unit can no longer apply any pressure to the handpiece assembly.

2. A medication infusion system as recited in claim 1, wherein the needle includes a needle sleeve configured to seal with the handpiece.

3. A medication infusion system as recited in claim 1, wherein the predetermined pressure threshold is 550 psi.

4. A medication infusion system as recited in claim 1, wherein the cartridge holder includes at least two radially projecting wings configured for engagement with the receptacle of the medication infusion system.

5. A medication infusion system as recited in claim 1, including a cartridge received in the cartridge holder and wherein the cartridge holder includes a spike oriented to puncture the cartridge, the cartridge being configured for movement relative to the cartridge holder and the spike.

6. A medication infusion system as recited in claim 5, wherein the medication infusion system is configured to aspirate fluid from the body during movement of the cartridge away from the spike.

7. A medication infusion system as recited in claim 1, wherein the cartridge holder includes lateral openings that define windows in sidewalls of the cartridge holder.

8. A medication infusion system as recited in claim 1, wherein the tubing resists shape deformation in the applied pressure range between 200 psi to 650 psi.

9. A medication infusion system comprising:

a drive unit having a receptacle and being configured to apply pressure in a range of 200 psi to 650 psi, to a hand piece assembly for delivering medication to a body;

a disposable handpiece assembly detachably connected to the drive unit, the handpiece comprising;

a cartridge holder being configured for disposal of a medication cartridge, the cartridge holder having an end for receiving a medication cartridge, the end of the cartridge holder having a plurality of wings and being connected with the receptacle of the medication infusion system by an interference fit of the wings inside the receptacle;

microbore tubing having a first end and a second end, the first end being fixedly sealed by bonding that is impermeable to leakage with the cartridge holder such that the cartridge holder facilitates communication between the tubing and the medication cartridge;

a needle assembly with a needle for injecting a patient'"'"'s tissue;

a handpiece being fixedly sealed by bonding that is impermeable to leakage with the needle assembly and by bonding that is impermeable to leakage with the second end of the tubing such that the tubing and the needle assembly are in communication;

the wings of the cartridge holder being connected to the end of the cartridge holder at wing junctions that have a reduced wall thickness configured for structural failure, such that the wing junctions break at a predetermined threshold in the range of 450 to 550 psi, as applied to the handpiece assembly from the medication infusion system, such that the interference fit between the wings and the receptacle fails at the predetermined pressure threshold and thereby disconnects the cartridge holder from the drive unit so that the drive unit can no longer apply any pressure to the handpiece assembly;

the medication infusion system further comprising;

a sensor coupled to the drive unit for sensing an internal parameter indicative of the pressure being applied by the drive unit and internal resistances within the medication infusion system; and

a controller coupled to the sensor and the drive unit, the controller including a calculator for calculating an exit pressure of the medication at the needle assembly, the controller generating commands to ensure the exit pressure does not exceed a predetermined level.

10. A medication infusion system as recited in claim 9, wherein the needle includes a needle sleeve configured to seal with the handpiece.

11. A medication infusion system as recited in claim 9, wherein the predetermined pressure threshold is 550 psi.

12. A medication infusion system as recited in claim 9, wherein the cartridge holder includes at least two radially projecting wings configured for engagement with the receptacle of the medication infusion system.

13. A medication infusion system as recited in claim 9, including a cartridge received in the cartridge holder and wherein the cartridge holder includes a spike oriented to puncture the cartridge, the cartridge being configured for movement relative to the cartridge holder and the spike.

14. A medication infusion system as recited in claim 13, wherein the medication infusion system is configured to aspirate fluid from the body during movement of the cartridge away from the spike.

15. A medication infusion system as recited in claim 9, wherein the cartridge holder includes lateral openings that define windows in sidewalls of the cartridge holder.

16. A medication infusion system as recited in claim 9, wherein the tubing resists shape deformation in the applied pressure range between 200 psi to 650 psi.