US 7,887,345 B2Grant

Single use connector for pulse oximetry sensors

Issue Date:2011-02-15

•18 Claims

•4 Drawing Sheets

Abstract

This disclosure describes systems and methods for a single-use oximetry sensor in which a single-use connector is used with the sensor assembly. The disclosure describes a connector which consists of a single-use male connector for use with female connector on an oximeter. The connector includes a housing enclosing one or more pins, one or more movable members, and a locking mechanism. Upon engagement of the male connector into the female connector the locking mechanism activates such that when the female connector is removed, the moveable member moves from a first position to a second position and locks into the second position. When in the second position the male connector can not engage the female connector, thereby limiting the male connector to a single use engagement.

Metadata

Assignee

Nellcor Puritan Bennett LLC

Inventors

Marvin Wong
Albert Ollerdessen

Application Information

Application Number:US 12/165,166

Filing Date:2008-06-30

Priority Date:2008-06-30

Art Unit:2839

Classifications

IPC:

H01R13/44

Patent Drawings (4 sheets)

Description

Background

[0001] In medicine, a plethysmograph is an instrument that measures physiological parameters, such as variations in the size of an organ or body part, through an analysis of the blood passing through or present in the targeted body part, or a depiction of these variations. An oximeter is an instrument that determines the oxygen saturation of the blood. One common type of oximeter is a pulse oximeter, which determines oxygen saturation by analysis of an optically sensed plethysmograph.

[0002] A pulse oximeter is a medical device that indirectly measures the oxygen saturation of a patient's blood (as opposed to measuring oxygen saturation directly by analyzing a blood sample taken from the patient) and changes in blood volume in the skin. Ancillary to the blood oxygen saturation measurement, pulse oximeters may also be used to measure the pulse rate of the patient.

[0003] A pulse oximeter may include a light sensor that is placed at a site on a patient, usually a fingertip, toe, forehead or earlobe, or in the case of a neonate, across a foot. Light, which may be produced by a light source integrated into the pulse oximeter, containing both red and infrared wavelengths is directed onto the skin of the patient and the light that passes through the skin is detected by the sensor. The intensity of light in each wavelength is measured by the sensor over time. The graph of light intensity versus time is referred to as the photoplethysmogram (PPG) or, more commonly, simply as the “pleth”. From the waveform of the PPG, it is possible to identify the pulse rate of the patient and when each individual pulse occurs. In addition, by comparing the intensities of two wavelengths at different points in the pulse cycle, it is possible to estimate the blood oxygen saturation of hemoglobin in arterial blood. This relies on the observation that highly oxygenated blood will absorb relatively less red light and more infrared light than blood with lower oxygen saturation.

[0004] Many SpO₂sensors are constructed with a male connector having pins molded in plastic into a shape that can be fitted into a complementary female connector constructed with openings for receiving the pins from the male connector. The female connector socket is typically located on the main housing of the oximeter. The standard RS 232 connector is one common type of connector used.

[0005] As with many medical devices, SpO₂sensors are designed for single patient use in order to prevent the spread of disease between patients as well as to ensure that the sensor will operate to the exacting specifications of a medical device. However, whether unwittingly or not, it is not uncommon for oximetry sensors to be reused for different patients. Regardless of the reason, this reuse is not desirable.

Summary

[0006] This disclosure describes systems and methods for a SpO2 sensor that is limited to a single use through the use of a single-use connector on the sensor assembly. As discussed in greater detail below, this disclosure describes a sensor which consists of a single-use male connector for use with female connector on the oximeter. The connector includes a housing enclosing one or more pins, one or more movable members, and a locking mechanism. Upon engagement of the male connector with the female connector the locking mechanism activates such that when the female connector is removed, the moveable member moves from a first position to a second position and locks into the second position. When in the second position the male connector can not engage the female connector, thereby limiting the male connector to a single use engagement.

[0007] In one aspect, the disclosure describes a single-use male connector for use with female connector. The male connector includes a housing enclosing one or more pins, one or more movable members adjacent to the other one or more pins and a locking mechanism. When engaged with the female connector, the engagement activates the locking mechanism such that when the female connector is removed, the moveable member moves from a first position to a second position and locks into the second position. The second position is such that the male connector can not engage the female connector, thereby limiting the male connector to a single use. In the single-use male connector, one or more of the pins may penetrate the movable member.

[0008] In another aspect, the disclosure describes a single-use oximetry sensor that includes: a sensor including at least one light source and at least one light detector; and a single-use connector electrically connected to the sensor via a cable containing one or more wires. The single-use connector is adapted for use with a complementary connector on an oximeter. The single-use connector contains a movable member that, upon disengagement after a first engagement with the complementary female, moves to a position preventing further engagement with the complementary female connector.

[0009] In a further aspect, the single-use oximetry sensor is provided with a single-use male connector for use with a complementary female connector. The single-use male connector may further include: a housing enclosing one or more pins, one or more movable members adjacent to the other one or more pins; and a locking mechanism. Engagement of the single-use male connector into the complementary female connector activates the locking mechanism such that when the female connector is removed, the moveable member moves from a first position to a second position and locks into the second position. When in the second position the male connector can not engage the female connector, thereby limiting the male connector to a single use engagement.

[0010] The single-use connector may further be designed so that some or all of the one or more pins penetrate the movable member. The single-use connector may further be designed so that when the single-use male connector is engaged the movable member moves from a third position to a first position. The single-use connector may further be designed so that the movable member is penetrated by no pins. The single-use connector may further be designed so that the movable member is moved from the first position to the second position via a spring force exerted by a spring mechanism. The single-use connector may further be designed so that the spring mechanism is between the movable member and a back face of the housing. The single-use connector may further be designed so that the spring mechanism is integral with the locking mechanism. The single-use connector may further be designed so that the integral spring and locking mechanism is between the movable member and a back face of the housing. The single-use connector may further be designed so that the locking mechanism is between the movable member and a back face of the housing. The single-use connector may further be designed so that the housing is constructed to prevent a user from unlocking the movable member from the second position, thereby preventing a user from reusing the sensor after a first use.

[0011] These and various other features as well as advantages which characterize the systems and methods described herein will be apparent from a reading of the following detailed description and a review of the associated drawings. Additional features are set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the technology. The benefits and features of the technology will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

[0012] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

Brief Description of the Drawings

[0013] The following drawing figures, which form a part of this application, are illustrative of described technology and are not meant to limit the scope of the invention as claimed in any manner, which scope shall be based on the claims appended hereto.

[0014] FIG. 1 is a perspective view of the single-use connector and sensor system.

[0015] FIG. 2A illustrates a plan view of an embodiment of a single-use connector.

[0016] FIG. 2B illustrates a sectional view of the connector in FIG. 2A illustrating the three positions of the movable member relative to the housing.

[0017] FIG. 2C illustrates a sectional view of the connector of FIGS. 2A and 2B when engaged with a female connector.

[0018] FIG. 3 illustrates an embodiment of a movable member penetrated by no pins.

Detailed Description

[0019] Although the techniques introduced above and discussed in detail below may be implemented for a variety of medical devices and sensors, the present disclosure will discuss the implementation of these techniques in a pulse oximeter. The reader will understand that the technology described in the context of a pulse oximeter could be adapted for use with other systems that utilize sensors attached to the body such as electrocardiographs and electroencephalographs.

[0020] FIG. 1 is a perspective view of an embodiment of a pulse oximetry system 10. The system 10 includes a sensor 12 and a pulse oximetry monitor 14. The sensor 12 includes an emitter 16 for emitting light at one or more wavelengths into a patient's tissue. A detector 18 is also provided in the sensor 12 for detecting the light originally from the emitter 16 that emanates from the patient's tissue after passing through the tissue. The emitter 16 and detector 18 may be on opposite sides of a digit such as a finger or toe, in which case the light that is emanating from the tissue has passed completely through the digit. In an alternative embodiment, the emitter 16 and detector 18 may be arranged so that light from the emitter 16 penetrates the tissue and is reflected by the tissue into the detector 18, such as a sensor designed to obtain pulse oximetry data from a patient's forehead.

[0021] The sensor 12 may be connected to and draw its power from the monitor 14 as shown. The sensor is connected to the monitor by a single-use SpO₂connector. The monitor 14 may be configured to calculate physiological parameters based on data received from the sensor 12 relating to light emission and detection. Further, the monitor 14 includes a display 20 configured to display the physiological parameters, other information about the system, and/or alarm indications. In the embodiment shown, the monitor 14 also includes a speaker 22 to provide an audible alarm in the event that the patient's physiological parameters are not within a normal range, as defined based on patient characteristics. The sensor 12 is communicatively coupled to the monitor 14 via a cable 24 and male single-use connector 30. The single-use connector 30 of the sensor 12 is shown engaged with a complimentary connector (not visible) on the monitor 14.

[0022] In the illustrated embodiment, the pulse oximetry system 10 also includes a multi-parameter patient monitor 26. The multi-parameter patient monitor 26 may be configured to calculate physiological parameters and to provide a central display 28 for information from the monitor 14 and from other medical monitoring devices or systems (not shown). For example, the multiparameter patient monitor 26 may be configured to display a patient's oxygen saturation reading generated by the pulse oximetry monitor 14 (referred to as an “SpO₂” reading), pulse rate information from the monitor 14 and blood pressure from a blood pressure monitor (not shown) on the display 28. Additionally, the multi-parameter patient monitor 26 may emit a visible or audible alarm via the display 28 or a speaker 30, respectively, if the patient's physiological characteristics are found to be outside of the normal range. The monitor 14 may be communicatively coupled to the multi-parameter patient monitor 26 via a cable 32 or 34 coupled to a sensor input port or a digital communications port, respectively. In addition, the monitor 14 and/or the multi-parameter patient monitor 26 may be connected to a network to enable the sharing of information with servers or other workstations (not shown). The monitor 14 may be powered by a battery (not shown) or by a conventional power source such as a wall outlet.

[0023] FIG. 2A illustrates a plan view of an embodiment of a single-use connector adapted for use with an oximeter sensor. In the embodiment shown, the male connector 299 takes a form similar to that of an RS 232 connector and includes: a housing 200; the housing 200 enclosing a back face 201; a movable member (in the form of a moveable faceplate 220); one or more pins (in the embodiment shown there are seven pins 202) penetrating holes 222 in the movable member 220; a cable 253; a spring mechanism 250 and a locking mechanism 252 illustrated as one or more latches 255 (illustrated in an exaggerated size in FIG. 2B)) designed to lock the movable member 220 into a use-preventing position 213.

[0024] The connector housing 200 can be made of plastic, metal or any suitable material. In addition to the elements shown in FIG. 2A, the housing 200 also includes the electrical wiring which carries the electrical signals from the pins 202 through the cable 253 to the sensor. In an embodiment, the housing 200 is of a unitary construction or otherwise made in such a way as to prevent the connector 299 from being disassembled. Such tamper-proof design prevents the connector 299 from being disassembled in order to reset the movable member after it has been used. In an embodiment, the housing 200 may be constructed so that an attempt to reset the movable member 220 or prevent it from locking after a use will result in the destruction of the housing 200.

[0025] The back face 201 can be made of plastic, metal or any other suitable material. The back face 201 is part of the housing 200. The one or more pins 202 are mounted to the back face 201 in a complementary configuration to that of the intended female connector 290 (see FIG. 2C) on the oximeter.

[0026] The connector 299 includes a movable member 220 that is adapted to move between various positions when engaged and disengaged with a complementary connector 290. FIG. 2B illustrates a sectional view of the connector in FIG. 2A illustrating the three positions of the movable member relative to the housing. In the embodiment shown, the moveable member moves from an initial position 212 to an engaged position 211 when engaged with the complementary connector 290. Upon disengagement with the complementary connector 290 the movable member 220 moves from the engaged position 211 to a use-preventing position 213, in which position it is locked in place. In the use-preventing position 213 the movable member 220 is i such a position relative to the pins 202 and the housing 200 that it can no longer be used to engage and or electrically couple to the complementary connector 290. In this position 213, the male connector 299 may be so configured as to not be able to physically engage the female connector 290. Alternatively, while a physical engagement may be possible when in the use-preventing position 213, an electrical engagement may be prevented by limiting the depth to which the pins penetrate the receiving sockets in the female connector 290.

[0027] In the embodiment shown in FIGS. 2A and 2B, the movable member takes the form of a face that is substantially the same shape as the back face 201. The movable member 220 moves parallel to the back face 201, within the housing 200. The movable member 220 is penetrated by apertures or holes 222 through which the pins 202 penetrate.

[0028] In the embodiment shown, the spring mechanism 250 is mounted to a portion of the back face 201 and operates to provide a spring tension on the movable member 220. In the embodiment shown, the spring mechanism 250 is activated upon engagement of the male connector 299 with the complimentary connector 290. In an alternative embodiment, the spring mechanism 250 may be activated by a different action, e.g., by the act of removing/disengaging the male and female connectors. Regardless, upon disengagement of the male connector 299 from the female connector 290, the spring mechanism 250 operates to force the movable member 220 from the engaged position 211 to the use-preventing position 213. The spring mechanism 250 may include one or more springs of any type or configuration. For example, a coil spring, leaf spring or elastomeric bumper may be used to provide the spring tension. In an embodiment, the spring mechanism 250 may include a release mechanism (not illustrated) so that the spring force is not released until such a time as the moveable member 220 is moved to the engaged position 211 or, alternatively, until such time as the male connector 299 is removed from the female connector 290. Spring tensioning and the contingent release of spring forces in a mechanical device are well known in the mechanical arts and one of skill in the art could identify many different methods and means for achieving the movement of the movable member 220 as described herein.

[0029] As described above, the movable member 220 locks in place in the use-preventing position 213 after disengagement from the complementary connector 290. In the embodiment shown, the locking is achieved through the use of one or more latches 255. The latches 255 may be active members or passive contours that allow the movable member to pass in only one direction. In an alternative embodiment, a locking mechanism may be combined with or incorporated into the spring mechanism 250 to prevent the movable member 220 from moving out of the use-preventing position 213 after disengagement of the connectors 299, 290.

[0030] As well known in the art the pins 202 can be made in any manner and of any material suitable for creating an electrical contact with the socket it is intended to engage with. In the embodiment shown, the pins 202 may be mounted to the back face 201. The pins 202 are positions so as to align with a female connector socket 290 attached to an oximeter. As described above, the pins 202 are electrically connected by wiring which carries an electrical signal from the pins 202 to the SpO₂sensor. The cable 253 encloses the electrical wiring in a protective, non-conductive coating.

[0031] FIG. 2C illustrates a sectional view of an embodiment of the engagement of the male connector 299 and female connector 290. Engagement of the male connector 299 into the female connector 290 activates the spring mechanism 250 and locking mechanism 252 such that when the female connector 290 is removed, the moveable member 220 moves from a first, engaged position 211 to a second, use-prevention position 213 and locks into the second position 213. As discussed above, when in the second position 213 the male connector 299 can not engage the female connector 290, thereby limiting the connector to a single-use engagement.

[0032] FIG. 2C illustrates the displacement of the movable member 220 from a third, initial position 212 into the first, engaged position 211. In the embodiment shown, this displacement is caused by the force exerted when an operator engages the connectors 299, 290 at which time a forward face 292 of the female connector 290 presses against the movable member 220.

[0033] FIG. 3 illustrates a plan view of a different embodiment of a single-use connector adapted for use with an oximeter sensor. In the embodiment shown, the male connector 299. In the embodiment shown, the movable member 320 is only a portion of a fixed forward face 220 from which the pins 202 extend. In the embodiment shown, the movable member 320 is located within the pins 202 and is not penetrated by any of the pins 202. The movable member 320 operates as described above with respect to FIGS. 2A-2C, i.e., engagement of the connector 399 with a female connector 290 results in the movable member 320 being displaced from an initial position 212 into an engaged position 211. Upon disengagement of the male connector 299 from the female connector 290, the spring mechanism 250 operates to force the movable member 320 from the engaged position 211 to the use-preventing position 213 where it is locked in place by the locking mechanism 252.

[0034] Other embodiments in which the shape and extent of the movable member 320 relative to the connector face 220 are also possible. Any such shape, whether penetrated by pins 202 or not, may be used to prevent the connector from being used after a single use.

[0035] It will be clear that the systems and methods described herein are well adapted to attain the ends and advantages mentioned as well as those inherent therein. Those skilled in the art will recognize that the methods and systems within this specification may be implemented in many manners and as such is not to be limited by the foregoing exemplified embodiments and examples. In other words, functional elements being performed by a single or multiple components and individual functions implemented in different manners and with different elements in order to achieve the same results. In this regard, any number of the features of the different embodiments described herein may be combined into one single embodiment and alternate embodiments having fewer than or more than all of the features herein described are possible.

[0036] While various embodiments have been described for purposes of this disclosure, various changes and modifications may be made which are well within the scope of the present invention. For example, multiple movable faces may be used in a single connector. Additionally, the use-prevention position of the movable member may be any position that prevents effective reconnection with the complementary connector including a position in which the pins are entirely enclosed by the housing and movable member or in which the moveable member extends out from the housing. Alternatively, any suitable locking mechanism and/or spring mechanism may be used to achieve the result of moving a member to prevent use after a first use.

[0037] Numerous other changes may be made which will readily suggest themselves to those skilled in the art and which are encompassed in the spirit of the disclosure and as defined in the appended claims.

Claims

What is claimed is:

1. A single-use connector for use with a complementary connector comprising:

a housing enclosing a pin, a movable member adjacent to the pin and a locking mechanism;

wherein engagement of the single-use connector into the complementary connector moves the moveable member from an initial position to an engaged position and activates the locking mechanism such that when the complementary connector is removed, the moveable member moves from the engaged position, past the initial position and to a use-preventing position and locks into the use-preventing position; and

wherein when in the use-preventing position the single-use connector cannot engage the complementary connector.

2. The connector of claim 1, wherein the pin penetrates the movable member.

3. The connector of claim 1, wherein the movable member is not penetrated by the pin.

4. A single-use oximetry sensor comprising:

a sensor comprising a light source and a light detector; and

a single-use connector electrically connected to the sensor via a cable comprising one or more wires;

wherein the single-use connector comprises:

a movable member that, upon disengagement from a complementary connector, moves to a use-preventing position preventing further engagement with the complementary connector.

5. The single-use oximetry sensor of claim 4 wherein the single-use connector comprises:

a housing enclosing a pin wherein the movable member is adjacent to the pin; and

a locking mechanism;

wherein engagement of the single-use connector into the complementary connector activates the locking mechanism such that when the complementary connector is removed, the moveable member moves from an engaged position to the use-preventing position and locks into the use-preventing position.

6. The single-use oximetry sensor of claim 5, wherein the pin penetrates the movable member.

7. The single-use oximetry sensor of claim 5, wherein when the single-use connector is engaged the movable member moves from an initial position to the use-preventing position.

8. The single-use oximetry sensor of claim 5, wherein the movable member is not penetrated by the pin.

9. The single-use oximetry sensor of claim 5, wherein the locking mechanism is between the movable member and a back face of the housing.

10. The single-use oximetry sensor of claim 5, wherein the housing is of unitary construction to prevent a user from opening the housing and unlocking the movable member from the use-preventing position.

11. The single-use oximetry sensor of claim 5, wherein the moveable member is capable of moving substantially parallel to the back face within the housing.

12. The single-use oximetry sensor of claim 5, wherein the movable member is moved from the engaged position to the use-preventing position via a spring force exerted by a spring mechanism.

13. The single-use oximetry sensor of claim 12, wherein the spring mechanism is between the movable member and a back face of the housing.

14. The single-use oximetry sensor of claim 12, wherein the spring mechanism is integral with the locking mechanism.

15. The single-use oximetry sensor of claim 14, wherein the spring mechanism and locking mechanism are between the movable member and a back face of the housing.

16. A single-use pulse oximetry sensor comprising:

a sensor comprising a light source and a light detector; and

a single-use connector electrically connected to the sensor via a cable comprising one or more wires;

wherein the single-use connector comprises:

a housing enclosing:

a plurality of pins coupled to the one or more wires;

a moveable member penetrated by the plurality of pins;

a spring disposed in the housing to bias the moveable member towards a connecting end of the single-use connector;

a locking mechanism disposed between the connecting end of the single-use connector and an initial position of the moveable member; and

wherein upon an initial engagement of the single-use connector with a complementary connector, the moveable member moves from the initial position to an engaged position in a direction away from the connecting end and compresses the spring, such that when the single-use connector is disengaged from the complementary connector, the spring moves the moveable member towards the connecting end, past the initial position, to a use-preventing position so that the locking mechanism locks the moveable member in the use-preventing position.

17. The single-use pulse oximetry sensor of claim 16, wherein the locking mechanism comprises a latch configured to abut against a side of the moveable member.

18. The single-use pulse oximetry sensor of claim 16 wherein the single-use connector is a male single-use connector for use with a complementary female connector comprising a receiving socket;

wherein when the moveable member is in the engaged position, the pins are electrically coupled to the receiving socket; and

wherein when the moveable member is in the use-preventing position, the pins are electrically disconnected from the receiving socket.

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Abstract