CA2165812A1 - Flex circuit connector - Google Patents

Flex circuit connector

Info

Publication number
CA2165812A1
CA2165812A1 CA002165812A CA2165812A CA2165812A1 CA 2165812 A1 CA2165812 A1 CA 2165812A1 CA 002165812 A CA002165812 A CA 002165812A CA 2165812 A CA2165812 A CA 2165812A CA 2165812 A1 CA2165812 A1 CA 2165812A1
Authority
CA
Canada
Prior art keywords
contact pads
flex circuit
terminal block
flex
conductive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
CA002165812A
Other languages
French (fr)
Inventor
Peter C. Lord
William P. Van Antwerp
John J. Mastrototaro
Paul S. Ii Cheney
Nannette M. Schnabel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Medtronic Minimed Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2165812A1 publication Critical patent/CA2165812A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/77—Coupling devices for flexible printed circuits, flat or ribbon cables or like structures
    • H01R12/771—Details
    • H01R12/774—Retainers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/77—Coupling devices for flexible printed circuits, flat or ribbon cables or like structures
    • H01R12/78—Coupling devices for flexible printed circuits, flat or ribbon cables or like structures connecting to other flexible printed circuits, flat or ribbon cables or like structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/82—Coupling devices connected with low or zero insertion force
    • H01R12/85—Coupling devices connected with low or zero insertion force contact pressure producing means, contacts activated after insertion of printed circuits or like structures
    • H01R12/88—Coupling devices connected with low or zero insertion force contact pressure producing means, contacts activated after insertion of printed circuits or like structures acting manually by rotating or pivoting connector housing parts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
    • A61B2562/22—Arrangements of medical sensors with cables or leads; Connectors or couplings specifically adapted for medical sensors
    • A61B2562/225—Connectors or couplings
    • A61B2562/227—Sensors with electrical connectors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/01—Dielectrics
    • H05K2201/0104—Properties and characteristics in general
    • H05K2201/0133—Elastomeric or compliant polymer
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H05K3/325—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by abutting or pinching, i.e. without alloying process; mechanical auxiliary parts therefor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/36—Assembling printed circuits with other printed circuits
    • H05K3/361—Assembling flexible printed circuits with other printed circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/36—Assembling printed circuits with other printed circuits
    • H05K3/361—Assembling flexible printed circuits with other printed circuits
    • H05K3/365—Assembling flexible printed circuits with other printed circuits by abutting, i.e. without alloying process

Abstract

A connector (10) is provided for electrical connection to a flex circuit (12) in a hermetically sealed manner. The flex circuit comprises thin film conductors (26) encased between layers of insulative material, and including a proximal end (20), with conductive contact pads (30) exposed through one of the insulative layers. In a preferred form, the proximal ends of two flex circuits are assembled in face-to-face relation and compressed by a clamp fixture (16) against opposite side faces of a compressible terminal block (18). The terminal block is formed from a resilient insulative elastomer such as silicone rubber with embedded conductive strips (40) having opposite edges exposed at the opposite side faces of the terminal block for electrically connecting aligned pairs of the contact pads on the two flex circuits.

Description

WO95/31016 ~CT~S95/05414 21 6 5~1 2, ~, ,, "~, ~

FLEX CIRCUIT CONNECTOR

BACKGROUND OF THE INVENTION

This invention relates qenerally to connector devices for electrically connecting flexible circuit structures of the type having thin film conductors encased between relatively thin film layers of insulative material. More specifically, this invention relates to an improved connector for quick and easy coupling with a flex circuit in conductive and hermetically sealed relation.
Thin film flex circuits are generally known in the art for carrying electrical signals in a variety of compact electronics applications. Such devices may comprise a plurality of thin conductors formed on a relatively thin base layer of insulative material, such as polyimide sheet or t:he like. The conductors are then covered in turn by an upper or overlying layer of the insulative material, to form an elongated and relatively flexible circuit structure. At appropriate points along the length of the structure, apertures are formed in one of the insulation layers to expose portions of the conductors in order to permit electrical connection of the conductors to other electronic components.
The exposed conductors are often referred to as contact pads and, in most cases, are located near the proximal and distal ends of the flex structure.

WO9S/31016 PCT~S95/05414 6 5 ~

In some operating environments, flex circuits are used to carry electrical signals of extremely low power. For example, flex circuit technology has been adapted to fabricate relatively small and flexible electrochemica~ thin film sensors for use in a variety of applications, such as transcutaneous placement of sensor electrodes in direct contact with patient blood so that periodic blood chemistry readings can be obtained over an extended period of time. See, for example, U.S.
Serial No. 08/212,961, filed March 15, 1994, and entitled METHOD OF FABRICATING THIN FILM SENSORS. In electrochemical sensors of this type, electrode chemistries are applied to exposed contact pads at a distal end of a flex circuit, to provide sensor electrodes adapted for transcutaneous placement.
Additional exposed contact pads at a proximal end of the flex circuit are provided for electrical connection to appropriate monitoring equipment. The low current signals inherent in such sensors mandate a high quality electrical connection between the sensor electrodes and the monitoring equipment, with minimum electrical leakage. In addition, it is important for this electrical connection to be hermetically sealed, in order to safeguard the electrical connection against moisture contamination while permitting substantially normal daily patient activities such as bathing and showerin~, etc.
The present invention relates specifically to an improved flex circuit connector adapted for quick and easy connection to one or more flex circuits to provide a high quality electrical connection which is hermetically sealed.

SUMMARY OF THB INVENTION

In accordance with the invention, a flex circuit connector is provided for electrical 2 1 65 ~1~ PCT~S95/05414 3 ,; ~ ~
..~.
connection to one or more flex circuits in hermetically sealed relation. The connector comprises a terminal block formed from an insulative elastomer such as silicone rubber, with conductive strips embedded therein and having exposed edges at opposite side faces of the terminal block. The terminal block is adapted in one preferred form to fit between the proximal ends of a pair of flex circuits having exposed conductive contact pads presented in face-to-face relation for engaging the opposite side faces of the terminal hlock. Clamp means in the form of a clamp fixture compressively retains the proximal ends of the flex circuits against the terminal block, with aligned pairs of contact pads on the two flex circuits being electrically interconnected by the conductive strips. Importantly, the conductive strips of the terminal block are circumscribed by t:he insulative elastomer which engages the terminal blocks along a footprint circumscribing the exposed contact pads, such that the terminal block also hermetically seals the int:erface between the conductive strips and the contact pads.
The two flex circuits, in a preferred form, each include a plurality of thin film conductors embedded or encased between thin film layers of insulative material, such as polyimide film. One of the insulative layers of each flex circuit has a plurality of apertures formed therein at the proximal end thereof to expose the conductive contact pads.
These conductive contact pads are physically spaced from one another with a pitch spacing for contacting the conductive strips within the terminal block, whereby the conductive strips electrically interconnect aligned pairs of the contact pads on the two flex circuits. Alternately, the connector may be used for electrical and hermetically sealed coupling with a single flex circuit.

WO95/31016 - - ;r~ ~ PCT~S95/0541 ~ ~5~ ~ ~4~
The clamp fixture comprises a lower base plate and an upper clamp plate in combination with lever means for pressing the clamp plate toward the base plate. The proximal end of the two flex circuits are assembled with their exposed contact pads in face-to-face relation sea~d against the opposite side faces of the termin~ block, and the lever means is operated to comp~essively retain the flex circuits against the terminal block. The magnitude of terminal block compression is chosen to provide high quality electrical interconnection in combination with a hermetic seal circumscribing the contact pads on each flex circuit. In one preferred form, the clamp means is designed to compress the terminal block in excess of fifteen percent compression.
Other features and advantages of the present invention will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings illustrate the invention. In such drawings:
FIGURE 1 is an exploded perspective view illustrating a flex circuit connector embodying the novel features of the invention;
FIGURE 2 is an enlarged fragmented vertical sectional view, illustrating the flex circuit connector in a closed position electrically interconnecting two flex circuits in hermetically sealed relation; and FIGURE 3 is an exploded perspective view illustrating the proximal ends of a pair of flex circuits assembled in face-to-face relation with a terminal block interposed therebetween.

WO95/31016 ~,~ J ~

DETAILED DES~K~ ON OF ~HE PREFERRED EMBODIMENT

As shown in the exemplary drawings, a flex cirucit connector referred to generally by the reference numeral ~0 is provided for interconnecting a pair of flex circuits 12 and 14. The connector 10 includes a clamp fixture 16 for compressedly ret~;n;mg adjacent proximal ends of the flex circuits 12 and 14 against opposite side faces of a terminal block 18.
Although the flex circuit connector 10 of the present invention has utility in a variety of electronic devices and systems, the illustrative drawings show the invention for electrically connect:ing an electrochemical sensor with a flex circuit used to convey electrical signals to an appropriate monitor device (not shown). FIG. 1 shows the electrochemical sensor in the for~.n of the flex circuit 12 provided in a transcutaneous insertion set 22 of khe type described in copending U.S. Serial No.
08/213,101, entitled TRANSCUTANEOUS SENSOR INSERTION
SET, filed March 15, 1994, which is incorporated by reference herein. In general terms, for purposes of clarity and completeness of description, the inserti.on set 22 includes an insertion needle 24 for transcutaneous placement of a distal end of the flex circuit 12 having sensor electrodes exposed for directly contacting patient blood. ~ plurality of thin film conductors 26 are encased between relatively thin layers of insulative material, such as polyimide sheet, for conveying electrical signals along the length of the flex circuit. 12 from the distal end electrodes to the proximal end 20 thereo. The upper layer of insulative film material has a plurality of small openings 28 formed therein (FIG. 3) to expose conductive contact pads 30 at the proxim~l ends of the conductors 26.

W095/31016 PCT~S95/OS414 2~ 658~2 - ~

As shown in FIG. 3, the proximal end 32 of the second flex circuit 14 has a similar construction, to include a plurality of thin film conductors 34 encased between upper and lower insulative layers of polyimide film~ sheet or the like. At the proximal end 32, the ~ower insulative layer has openings formed therein ~o expose contact pads 38. The flex circuit 14 has a distal end (not shown) adapted for connection to the monitor device, so that patient blood chemistry can be monitored.
In general terms, the connector lO of the present invention is provided for quickly and easily establishing a high quality electrical connection between the contact pads 30 and 38 at the proximal ends 20, 32 of the two flex circuits. In addition, the connector lO provides a hermetic seal which circumscribes the conductive interface between the exposed contact pads 30 and 38 on the flex circuits.
Alternately, it will be understood that the connector lO may be used for electrical and hermetically sealed coupling with a single flex circuit. In either case, electrical leakage at the connection is substantially minimized or eliminated to prevent erroneous readings as a result of noise and other interference.
Moreover, in the illustrative application, the patient (not shown) may engage in substantially normal daily activities, including bathing and showering, exercising, etc., since the connector lO
prevents moisture ingress to the electrical interface.
As shown best in FIGS. 2 and 3, the terminal block 18 comprises a generally rectangular plate-shaped body formed from a resilient elastomer such as cured silicone rubber or the like. The block 18 encases a plurality of elongated strips 40 of conductive material such as a carbon-based or other selected conductor material. These conductive strips WO95/31016 21 6 5 81 2 PCT~S95/0~414 extend through the block 18 to define exposed edges at the upper and lower faces oi the terminal block. Moreover, the number of conductive strips 40 and the pitch spacing therebetween are designed for one-to-one contact between each conductive strip and a respective aligned pair of the contact pads 30 and 38 on the two flex cables. Importantly, the silicone elastomer material of the block 18 perimetrically circumscribes the conductive strips 40 along an uninterrupted line adapted to sealingly engage the flex circuits 12 and 14 along a line or footprint which circumscribes the contact pads. I'hus, when the terminal block 18 is compressedly retained between the proximal ends of the flex circuits, the terminal block 18 hermetically seals the contact pads against moisture ingress.
The clamp fixture 16 comprises one exemplary structure for providing a mechanical advantage to compressedly retain the proximal ends ;20, 32 of the flex circuits 12, 14 against the opposite side faces of the terminal block 18. As shown, t]he fixture 16 includes a rigid base plate 42 in combination with an overlying rigid clamp plate 44. A pair of support arms 46 project upwardly from opposite sides of the base plate 42 for slide-fit reception t:hrough track slots 4~ at opposite sides of the clamp plate 44. A
cam lever 50 has a cam lobe 52 carried on a pivot pin 54 which extends between the upper ends of the support arms 46. The cam lever 50 is movable to rotate the cam lobe 52 in a manner pressing downwardly on the clamp plate 44.
In use of the illustrative embodiment, the proximal end 20 of the flex circuit 12 is fitted into the clamp fixture 16, in a position between the support arms 46 with the contact pads 20 exposed upwardly. The proximal end 32 of the second flex circuit 14 is fitted into the fixture, in WO95/31016 ~-~ PCT/u~55/05414 ; t 2l 6S81 2 -8-face-to-face relation with the underlying flex circuit 12, so that the exposed contact pads 38 are presented downwardly. The terminal block 18 is interposed between the proximal ends of the fles circuits, oriented so that the conductive strips 40 are in parallel with the contact pads on the flex circuits. The cam lever 50 is rota~ed to urge the cam lobe 52 against the clamp ~;iate 44, thereby pressing the clamp plate downwardly to compress the terminal block 18 between the flex circuits.
With appropriate compression of the terminal block, preferably in excess of fifteen percent compression, the conductive strips 40 are electrically interconnected between aligned pairs of the contact pads on the two flex circuits, to provide a high quality electrical connection with little or no current leakage. Moreover, the size and shape of the terminal block is sufficient to engage the flex circuits along a footprint 58 (FIG. 3) which circumscribes the contact pads so that the electrical connection is hermetically sealed. Conveniently, the cam lever 50 moves the lobe 52 over-center, as viewed in FIG. 2, so that the clamp fixture 16 is effectively locked in the closed position.
A variety of further modifications and improvements to the flex circuit connector of the present invention will be apparent to those skilled in the art. Accordingly, no limitation on the invention is intended by way of the foregoing description and accompanying drawings, except as set forth in the appended claims.

Claims (9)

WHAT IS CLAIMED IS:
1. A flex circuit connector for interconnecting a pair of flex circuits each having a proximal end with exposed conductive contact pads thereon, said flex circuit connector comprising:
a zebra terminal block having a body formed from a resilient insulative elastomer to define opposite side faces, and a plurality of conductive strips embedded within said body and having opposite edges exposed at said opposite side faces, said body defining insulative material circumscribing said conductive strips along an uninterrupted line at both of said opposite side faces; and clamp means for clamping the proximal ends of the flex circuits in face-to-face relation in engagement with said opposite side faces of said body and with said contact pads in conductive engagement with said conductive strips, said body engaging each of said flex circuits in hermetically sealed relation along a line of contact circumscribing the contact pads.
2. The ribbon cable connection of claim 1 wherein said clamp means is releasable.
3. The ribbon cable connector of claim 1 wherein said body of said terminal block is formed from silicone rubber.
4. The ribbon cable connector of claim 1 wherein said clamp means is adapted to compress said terminal block by a factor of at least fifteen percent compression.
5. A flex circuit connector for electrical and hermetically sealed connection to a flex circuit having a proximal end with a plurality of exposed contact pads thereon, said flex circuit connector comprising:
a terminal block having a body formed from a resilient insulative elastomer and a plurality of conductive strips embedded within said body, said conductive strips having edges exposed at one side face of said body, and said body defining insulative material circumscribing the exposed edges of said conductive strips at said one side face; and clamp means for clamping the proximal end of the flex circuit against said one side face of said body, with said contact pads respectively and conductively engaging said conductive strips, and with said body engaging the flex circuit in hermetically sealed relation along a line of contact circumscribing the contact pads.
6. The ribbon cable connector of claim 5 wherein said clamp means is releasable.
7. The ribbon cable connector of claim 5 wherein said body of said terminal block is formed from silicone rubber.
8. The ribbon cable connector of claim 5 wherein said clamp means is adapted to compress said terminal block by a factor of at least fifteen percent compression.
9. A flex circuit connector for interconnecting a pair of flex circuits each having a proximal end with at least one exposed conductive contact pad thereon, said flex circuit connector comprising:

a terminal block having a body formed from a resilient insulative elastomer to define opposite side faces, and at least one conductive strip embedded within said body and having opposite edges exposed at said opposite side faces, said body defining insulative material circumscribing said conductive strip along an uninterrupted line at both of said opposite side faces; and clamp means for clamping the proximal ends of the flex circuits in face-to-face relation in engagement with said opposite side faces of said body and with said contact pads in conductive engagement with said at least one conductive strip, said body engaging each of said flex circuits in hermetically sealed relation along a line of contact circumscribing the contact pads.
CA002165812A 1994-05-09 1995-05-01 Flex circuit connector Abandoned CA2165812A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/239,960 US5482473A (en) 1994-05-09 1994-05-09 Flex circuit connector
US08/239,960 1994-05-09

Publications (1)

Publication Number Publication Date
CA2165812A1 true CA2165812A1 (en) 1995-11-16

Family

ID=22904499

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002165812A Abandoned CA2165812A1 (en) 1994-05-09 1995-05-01 Flex circuit connector

Country Status (5)

Country Link
US (1) US5482473A (en)
EP (1) EP0707746A4 (en)
JP (1) JPH09500490A (en)
CA (1) CA2165812A1 (en)
WO (1) WO1995031016A1 (en)

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