INJECTION PRESSURE MONITORING DEVICE AND SYSTEM
The present disclosure describes an injection pressure monitoring device including a pressure sensor, an injection pressure monitoring system and kits for monitoring injection pressure generated at a needle tip when injecting a therapeutic fluid composition into tissue, to avoid generating potentially damaging pressure in the tissue being treated.
1 . An injection pressure monitoring device for coupling to a dispensing syringe, comprising:
a. a pressure sensor comprising a miniature or subminiature load cell operable for measuring a compression load of up to about 100 lb, having an amplifier and an electrical coupling coupled thereto for coupling to a pressure display unit;
b. a syringe adapter coupled to the load cell, the syringe adapter having a first surface configured to engage an outward end portion of a plunger rod of a plunger rod assembly of the dispensing syringe; and
c. a finger plate coupled to the load cell.
2 . The injection pressure monitoring device of claim 1 , wherein the dispensing syringe is a double-barreled syringe having a plunger rod assembly comprising two plunger rods each having an outward end portion, and an end plate coupling the outward end portions of the two plunger rods, wherein the syringe adapter has a surface configured to engage the end plate of the plunger rod assembly.
3 . The injection pressure monitoring device of claim 1 , wherein the load cell comprises a subminiature load cell operable for measuring a compression load of up to about 50 lb.
4 . The injection pressure monitoring device of claim 1 , wherein the load cell comprises a compression load cell.
5 . The injection pressure monitoring device of claim 1 , wherein the finger plate comprises an injection molded finger plate.
6 . The injection pressure monitoring device of claim 5 , wherein the finger plate comprises polytetrafluoroethylene.
7 . The injection pressure monitoring device of claim 5 , wherein the finger plate has a contact surface having a central depression.
8 . The injection pressure monitoring device of claim 5 , wherein the finger plate has a contact surface having a finger groove.
9 . An injection pressure monitoring system for maintaining injection pressure at a predetermined level in a tissue being injected with a fluid therapeutic composition from a dispensing syringe, the system comprising:
a. a pressure sensor for coupling to the syringe, comprising: (i) a miniature or subminiature load cell operable for measuring a compression load of up to about 100 lb, having an amplifier and an electrical coupling coupled thereto for coupling to a pressure display unit; (ii) a syringe adapter coupled to the load cell, the syringe adapter having a first surface configured to engage an outward end portion of a plunger rod of a plunger rod assembly of the dispensing syringe; and (iii) a finger plate coupled to the load cell;
b. a pressure display unit coupled to the pressure sensor electrical coupling and comprising a plurality of alarm elements; and
c. the dispensing syringe comprising a syringe body having at least one elongated barrel and a plunger rod assembly comprising a plunger rod having an outward end portion and operable for slidably engaging the inside of the elongated barrel, wherein the pressure sensor syringe adapter is coupled to the outward end portion of the plunger rod.
10 . The injection pressure monitoring system of claim 9 , wherein the dispensing syringe is a double-barreled syringe having a plunger rod assembly comprising two plunger rods each having an outward end portion, and an end plate coupling the outward end portions of the two plunger rods, wherein the syringe adapter has a surface configured to engage the end plate of the plunger rod assembly.
11 . The injection pressure monitoring system of claim 9 , wherein the pressure display unit comprises a first audible tone alarm and a second audible tone alarm.
12 . The injection pressure monitoring system of claim 11 , wherein the pressure display unit is configured to trigger the first audible tone alarm when the pressure sensor signals a pressure reading of at least 50 psi and to trigger the second audible tone alarm when the pressure sensor signals a pressure reading of at least 60 psi.
13 . The injection pressure monitoring system of claim 11 , wherein the pressure display unit is configured to trigger the first audible tone alarm when the pressure sensor signals a pressure reading of 75 psi and to trigger the second audible tone alarm when the pressure sensor signals a pressure reading of 95 psi.
14 . The injection pressure monitoring system of claim 11 , wherein the first audible tone alarm is an intermittent tone and the second audible tone is a continuous tone.
15 . The injection pressure monitoring system of claim 11 , further comprising a portable DC power source.
16 . A kit for monitoring injection pressure in a dispensing syringe during injection of a fluid composition into tissue of a subject, the kit comprising:
a. a pressure sensor for coupling to the syringe, comprising: (i) a miniature or subminiature load cell operable for measuring a compression load of up to about 100 lb, having an amplifier and an electrical coupling coupled thereto for coupling to a pressure display unit; (ii) a syringe adapter coupled to the load cell, the syringe adapter having a first surface configured to engage an outward end portion of a plunger rod of a plunger rod assembly of the dispensing syringe; and (iii) a finger plate coupled to the load cell; and
b. a dispensing syringe having a plunger rod assembly including a plunger rod having an outward end portion.
17 . The kit of claim 16 , wherein the dispensing syringe is a double-barreled syringe having a plunger rod assembly comprising two plunger rods each having an outward end portion, and an end plate coupling the outward end portions of the two plunger rods, wherein the syringe adapter has a surface configured to engage the end plate of the plunger rod assembly.
18 . The kit of claim 16 , wherein the load cell comprises a subminiature load cell operable for measuring a compression load of up to about 50 lb.
19 . The kit of claim 16 , wherein the load cell comprises a compression load cell.
20 . The kit of claim 16 , wherein the finger plate comprises an injection molded finger plate.
21 . The kit of claim 20 , wherein the finger plate comprises polytetrafluoroethylene
22 . The kit of claim 20 , wherein the finger plate has a contact surface having a central depression.
23 . The kit of claim 20 , wherein the finger plate has a contact surface having a finger groove.