Adapter and method for measuring pressures of fluid materials

• US 5,591,171 A
• Filed: 05/15/1995
• Issued: 01/07/1997
• Est. Priority Date: 06/14/1991
• Status: Expired due to Fees

• Current Assignee: Byron L. Brown
• Original Assignee: Byron L. Brown
• Inventors: Brown, Byron L.
• Primary Examiner(s): Tucker, Guy V.
• Application Number:
  US08/441,038
• Time in Patent Office: 603 Days
• Field of Search: 128/774, 128/748, 606/94, 606/93, 606/92, 606/86, 606/102, 604/100, 604/98, 604/97, 623/23, 623/22, 73/706, 73/715
• US Class Current: 606/94
• CPC Class Codes: A61B 17/8805 for introducing fluid filler into bone or extracting it A61B17/7097, A61B17/8833 take precedence
• CPC Class Codes: A61B 17/8808 with sealing collar for bone cavity
• CPC Class Codes: A61B 2050/0064 by screwing
• CPC Class Codes: A61B 2090/064 for measuring force, pressure or mechanical tension
• CPC Class Codes: A61F 2/30723 Plugs or restrictors for sealing a cement-receiving space tools for inserting plugs A61F2/4614; sealing collars for use during cementing A61B17/8808
• CPC Class Codes: A61F 2/3662 Femoral shafts
• CPC Class Codes: A61F 2/4657 Measuring instruments used for implanting artificial joints for surgical instruments A61B90/06
• CPC Class Codes: A61F 2002/467 for measuring fluid pressure
• CPC Class Codes: A61F 2002/4696 optical
• CPC Class Codes: G01L 19/0007 Fluidic connecting means

Abstract

Method and apparatus for measuring pressures of fluid materials used in medical procedures where purity and freedom from contamination are essential. An adapter having one or more highly resilient diaphragms therein is disposed serially within a passage leading to a pressure gauge from the material whose pressure is to be measured, thereby isolating the material which is on one side of the diaphragm(s) from the volume on the other side while at the same time transmitting the pressure from the material therethrough. By carefully selecting the characteristics of the diaphragm material, the desired sensitivity of pressure conduction is achieved while maintaining the integrity of the respective volumes on both sides of the diaphragm, achieving re-usability and preventing contamination.

Claims

1. Apparatus for measuring pressures of uncontaminated medical polymerizing materials while maintaining the uncontaminated state of such fluid materials comprising:

(a) a source of said uncontaminated medical polymerizing materials having a communicating orifice therein for communicating said fluid materials therewithin;

(b) an adapter having a pair of opposed ends, and an internal passageway extending therethrough, from one end to the other end;

(c) means for interconnecting said one end of said adapter with said communicating orifice, thereby to expose said one of said ends to said uncontaminated medical fluid materials;

(d) an inflatable and expandable diaphragm means having an inner surface and an outer surface, said diaphragm means being affixed within said adapter for contacting said polymerizing materials with said inner surface, for preventing said polymerizing materials from traversing said internal passageway, and for defining a variable volume within said adapter, extending from said outer surface to said other end; and

(e) pressure measuring means connected to said other end and closing said other end, thereby to enclose said variable volume, said pressure measuring means measuring pressure within said variable volume.

2. Apparatus according to claim 1 in which said pressure measuring means includes a pressure display device.

3. Apparatus according to claim 1 in which at least a portion of said adapter is transparent.

4. An adapter system for measuring pressure of polymerizing material, comprising:

(a) a source of polymerizing material;

(b) an orthopedic prosthetic device-positioning member having a communication orifice;

(c) an elongated tubular member having a pair of opposed ends and an internal passageway extending therethrough, from one end to the other end;

(d) means for interconnecting said one end of said tubular member with said source of polymerizing material and with said communicating orifice of said orthopedic prosthetic device-positioning member, thereby exposing said one end of said elongated tubular member to said polymerizing material;

(e) inflatable and expandable diaphragm means having an inner surface and an outer surface, said diaphragm means being affixed within said tubular member for contacting said polymerizing materials with said inner surface, for preventing said polymerizing materials from traversing said internal passageway, and for defining a variable volume, dependent upon the pressure presented by said polymerizing material, within said tubular member extending from said outer surface to said other end; and

(f) a pressure transducer connected to said other end and closing said other end thereby to enclose said variable volume, said pressure transducer measuring pressure within said variable volume.

5. An adapter system according to claim 4 in which at least a portion of said elongated tubular member is transparent.

6. An adapter system according to claim 4 in which said pressure transducer is a pressure gauge.

7. An adapter system according to claim 6 in which at least a portion of said elongated tubular member is transparent.

8. A method of measuring and displaying pressure of a polymerizing material used in medical procedures comprising;

(a) providing a source of said polymerizing material;

(b) providing a communicating orifice for said source of said polymerizing material thereby providing access to said source of said first fluid material;

(c) interconnecting an enclosed channel with said orifice;

(d) disposing within said enclosed channel an inflatable and expandable resilient diaphragm to block passage through said enclosed channel of said first fluid material to define a first variable volume for said polymerizing material on the first fluid side of said diaphragm, and a second discrete volume on the other side of said diaphragm;

(e) disposing within said second discrete volume a second fluid material;

(f) applying pressure to said polymerizing material thereby causing said polymerizing material to enter said expandable resilient diaphragm, reducing the volume of said second discreet volume, and transmitting said pressure of said polymerizing material therethrough to said second fluid material while preventing migration of said fluid materials between said first and said second fluid materials; and

(g) measuring the pressure of said second fluid material.