Inflatable Elastomeric Pump for an Infusion Assembly
An improved elastomeric pump for an infusion assembly. The pump includes a generally cylindrical mandrel body with first end, an opposed second end, a length, an outer diameter corresponding to a first radius (R mandrel ), a central bore extending through the length, a first port extending from the outer diameter to the bore to provide a fluid passageway, a fill port and an exit port in fluid communication with the bore. The pump includes an inflatable elastomeric tube disposed concentrically about the mandrel, the tube being sealingly secured on the mandrel near the respective ends of the tube and having an original inner diameter that corresponds to a second radius (r) so that it approximately matches the outer diameter of the mandrel (R mandrel ), a length (L) less than the length of the mandrel, a wall thickness (t) such that: (0.4225× r )< t ≦(0.660× r ).
1 . An elastomeric pump for an infusion assembly, the pump comprising:
a mandrel comprising a body having a first end and an opposed second end, a length, a central bore extending through the length, a first port positioned between the first end and second end and in fluid communication with the bore to provide a fluid passageway, a fill port in fluid communication with the bore, and an exit port in fluid communication with the bore; and
an inflatable elastomeric tube disposed concentrically about the mandrel, the tube positioned between the first end and second end of the mandrel and covering the first port, the tube being sealingly secured on the mandrel near the respective ends of the tube and having an original inner diameter that corresponds to a radius (r), a length (L) less than the length of the mandrel, and a wall thickness (t) such that:
(0.4225× r )< t ≦(0.660× r ).
2 . The pump of claim 1 , wherein the mandrel comprises a radius (R mandrel ) and a generally uniform outer diameter that matches the original inner diameter of the inflatable tube.
3 . The pump of claim 1 , wherein the inflatable tube further comprises a volume (v tube ) of an elastomeric material:
v tube =πL (2 rt+t 2 ).
4 . The pump of claim 1 , wherein the introduction of a volume of liquid (v liquid ) determined according to the following equation:
(12.50× v tube )≦ v liquid ≦(22.16× v tube )
through the fill port at a fill pressure of greater than 0 and less than 35 psig expands the inflatable elastomeric tube between the mandrel and the elastomeric tube such that the pump subsequently dispenses the volume of liquid through the first port upon contraction of the tube to its original inner diameter.
5 . The pump of claim 1 , wherein the elastomeric material is an elastomeric silicone.
6 . The pump of claim 5 , wherein the elastomeric silicone has a Shore Hardness of from 25 A to 40 A.
7 . The pump of claim 1 , wherein the inflatable tube is made from an elastomeric silicone such that the inflatable tube has a Shore Hardness of 37 A.
8 . An elastomeric pump for an infusion assembly, the pump comprising:
a mandrel comprising a body having a first end and an opposed second end, a length, a central bore extending through the length, a first port positioned between the first end and second end and in fluid communication with the bore to provide a fluid passageway, a fill port in fluid communication with the bore, and an exit port in fluid communication with the bore; and
an inflatable elastomeric tube disposed concentrically about the mandrel, the tube positioned between the first end and second end of the mandrel and covering the first port, the tube being sealingly secured on the mandrel near the respective ends of the tube and having an original inner diameter that corresponds to a radius (r), a length (L) less than the length of the mandrel, and a wall thickness (t) such that:
(0.4225× r )< t ≦(0.660× r )
the inflatable tube further comprising a volume (v tube ) of an elastomeric material:
v tube =πL (2 rt+t 2 )
such that introduction of a volume of liquid (v liquid ) determined according to the following equation:
(12.50× v tube )≦ v liquid ≦(22.16× v tube )
through the fill port at a fill pressure of greater than 0 and less than 35 psig expands the inflatable elastomeric tube between the mandrel and the elastomeric tube such that the pump subsequently dispenses the volume of liquid through the first port upon contraction of the tube to its original inner diameter.
9 . The pump of claim 8 , wherein the mandrel comprises a radius (R mandrel ) and a generally uniform outer diameter that matches the original inner diameter of the inflatable tube.
10 . An elastomeric pump for an infusion assembly, the pump comprising:
a mandrel comprising a body having a first end and an opposed second end, a length, a central bore extending through the length, a first port positioned between the first end and second end and in fluid communication with the bore to provide a fluid passageway, a fill port in fluid communication with the bore, and an exit port in fluid communication with the bore; and
an inflatable elastomeric tube disposed concentrically about the mandrel, the tube positioned between the first end and second end of the mandrel and covering the first port, the tube being sealingly secured on the mandrel near the respective ends of the tube and having an original inner diameter that corresponds to a radius (r), a length (L) less than the length of the mandrel, and a wall thickness (t) such that:
(0.4225× r )< t ≦(0.660× r )
and wherein the pump, upon inflation with a predetermined volume of liquid and during delivery of that liquid, exhibits a linear pressure versus volume curve from a deflation yield point that is above a predetermined operating pressure to a volume the corresponds with the dispensing of the volume of liquid through the first port upon contraction of the tube to its original inner diameter.
11 . The pump of claim 10 , wherein the inflatable tube further comprises a volume (v tube ) of an elastomeric material:
v tube =πL (2 rt+t 2 ).
12 . The pump of claim 10 , wherein the introduction of a volume of liquid (v liquid ) determined according to the following equation:
(12.50× v tube )≦ v liquid ≦(22.16× v tube )
through the fill port at a fill pressure of greater than 0 and less than 35 psig expands the inflatable elastomeric tube between the mandrel and the elastomeric tube.
13 . The pump of claim 10 , wherein the elastomeric material is an elastomeric silicone.
14 . The pump of claim 13 , wherein the elastomeric silicone has a Shore Hardness of from 25 A to 40 A.
15 . The pump of claim 14 , wherein the elastomeric silicone has a Shore Hardness of from 35 A to 40 A.
16 . The pump of claim 15 , wherein the inflatable tube is made from an elastomeric silicone such that the inflatable tube has a Shore Hardness of 37 A.
17 . An elastomeric pump for an infusion assembly, the pump comprising:
a mandrel comprising a body having a first end and an opposed second end, a length, a central bore extending through the length, a first port positioned between the first end and second end and in fluid communication with the bore to provide a fluid passageway, a fill port in fluid communication with the bore, an exit port in fluid communication with the bore;
an inflatable elastomeric tube disposed concentrically about the mandrel, the tube positioned between the first end and second end of the mandrel and covering the first port, the tube being sealingly secured on the mandrel near the respective ends of the tube and having an original inner diameter with a radius (r), a length (L) less than the length of the mandrel, a wall thickness (t) such that:
(0.4225× r )< t ≦(0.660× r )
and;
wherein the elastomeric material is an elastomeric silicone with a Shore Hardness of from 25 A to 40 A.
18 . The pump of claim 17 , wherein the inflatable tube further comprises a volume (v tube ) of an elastomeric material:
v tube =πL (2 rt+t 2 ).
19 . The pump of claim 17 , wherein the introduction of a volume of liquid (v liquid ) is determined according to the following equation:
(12.50× v tube )≦ v liquid ≦(22.16× v tube )
through the fill port at a fill pressure of greater than 0 and less than 35 psig expands the inflatable elastomeric tube between the mandrel and the elastomeric tube such that the pump subsequently dispenses the volume of liquid through the first port upon contraction of the tube to its original inner diameter.
20 . The pump of claim 17 , wherein the elastomeric silicone such has a Shore Hardness of 37 A.
21 . The pump of claim 17 , wherein the inflatable tube further comprises a volume (v tube ) of the elastomeric material:
v tube =πL (2 rt+t 2 )
such that introduction of a volume of liquid (v liquid ) determined according to the following equation:
(12.50× v tube )≦ v liquid ≦(22.16× v tube )
through the fill port at a fill pressure of greater than 0 and less than 35 psig expands the inflatable elastomeric tube between the mandrel and the elastomeric tube such that the pump subsequently dispenses the volume of liquid through the first port upon contraction of the tube to its original inner diameter.
22 . The pump of claim 17 , wherein upon inflation with a predetermined volume of liquid and during delivery of that liquid, the pump exhibits a linear pressure versus volume curve from a deflation yield point that is above a predetermined operating pressure to a volume the corresponds with the dispensing of all the volume of liquid through the first port upon contraction of the tube to its original inner diameter.
23 . The pump of claim 22 , wherein the inflatable tube further comprises a volume (v tube ) of an elastomeric material:
v tube =πL (2 rt+t 2 )
and wherein the introduction of the volume of liquid (v liquid ) determined according to the following equation:
(12.50× v tube )≦ v liquid ≦(22.16× v tube )
through the fill port at a fill pressure of greater than 0 and less than 35 psig expands the inflatable elastomeric tube between the mandrel and the elastomeric.
24 . The pump of claim 17 , wherein the mandrel comprises a radius (R mandrel ) and a generally uniform outer diameter that matches the original inner diameter of the inflatable tube.