US 20070083166 A1
A retractable needle fluid transfer device is provided. The device includes a manually operable actuator for affecting retraction. Upon depressing the actuator, a spring displaces the needle rearwardly so that the contaminated needle is enclosed, thereby preventing inadvertent needle sticks. The device includes forward and rearward stops for impeding displacement of the needle after the needle is retracted. A seal prevents contaminants from entering the device after the needle is retracted. A safety sampling access port adapter for obtaining fluid samples from a fluid line is also provided. The sampling adapter includes a first end configured to cooperate with an access port attached to the fluid line. The sampling adapter further includes a collapsible socket configured to cooperate with a fluid container such as a vacuum tube. A needle assembly disposed within the housing of the sampling adapter is operable to pierce the seal on the fluid container. After use, the socket is collapsed to prevent contact with the contaminated needle.
1. A medical device, comprising:
a hollow housing having a sharpened tip, the needle being operable between extended and retracted positions, wherein the sharpened tip projects forwardly from the housing in the extended position and the sharpened tip is enclosed within the housing in the retracted position;
a biasing element biasing the needle toward the retracted position;
an actuator for actuating the needle retainer to release the needle so that the biasing element propels the needle toward the retracted position;
a rearward stop connected with the needle, operable to retain the needle against continued rearward displacement after the needle is retracted;
a forward stop connected with the needle, operable to retain the needle against forward displacement after the needle is retracted;
a flexible conduit in fluid communication with the needle;
an expandible reservoir in fluid communication with the flexible conduit; and
a pierceable seal forming a fluid-tight seal over the forward end of the housing after the needle is displaced into the retracted position.
2. A medical device, comprising:
a hollow housing having an aperture in a wall of the housing, the aperture forming a rim;
a needle having a sharpened tip operable between an extended position in which the sharpened tip is exposed for use and a retracted position in which the needle is shielded;
a biasing element biasing the needle toward the retracted position;
a needle hub having a cylindrical body axially displaceable within the housing between a forward position and a rearward position, the needle hub having a central bore for receiving the needle,
wherein the needle is fixedly attached to the needle hub,
the needle hub being configured for providing a fluid tight connection between a fluid line and the needle;
a needle retainer releasably retaining the needle in the projecting position against the bias of the biasing element, comprising:
a radially deformable arm attached to the needle hub and projecting radially outwardly from the needle hub; and
an actuator disposed at the end of the arm releasably engaging the rim of the aperture and having a surface directly manually operable from outside the housing, wherein depressing the actuator releases the needle whereupon the biasing element displaces the needle hub into the rearward position;
a first rearward locking element projecting radially outwardly from the needle hub;
a second rearward locking element projecting radially inwardly from the wall of the housing, wherein the first and second rearward locking elements cooperate to impede rearward axial movement of the needle hub after the needle hub is displaced into the rearward position; and
a radially displaceable forward stop projecting radially inwardly from the housing, wherein the forward stop is operable to impede forward axial movement of the needle hub after the needle hub is displaced into the rearward position, wherein the forward stop is displaced radially as the needle hub is displaced from the forward position to the rearward position;
wherein the biasing element has a biasing force between an upper limit and a lower limit, the lower limit being defined by the amount of axial force required to effectuate radial displacement of the forward stop during retraction and the upper limit being defined by the amount of axial force required to overcome the engagement between the first and second rearward locking elements.
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This application is a continuation of U.S. patent application Ser. No. 10/405,114, filed Apr. 1, 2003, set to issue as U.S. Pat. No. 7,097,633, which is a continuation of U.S. patent application Ser. No. 09/461,267 filed Dec. 15, 1999, now issued as U.S. patent application Ser. No. 6,540,732. This application also claims priority to U.S. Provisional Patent Application No. 60/144,916, filed on Jul. 21, 1999 and U.S. Provisional Patent Application No. 60/112,371, filed on Dec. 15, 1998. Each of the foregoing applications is hereby incorporated by reference.
The present invention relates to a fluid transfer device for transferring fluid to or from a patient, and more particularly to a fluid transfer device having a retractable needle.
Various types of medical devices employ a needle for piercing the skin of a patient for diagnostic or therapeutic purposes. One such fluid transfer device is a fluid collection device which includes a needle for piercing a blood vessel or other part of the patient to allow a fluid, for example, blood, to be withdrawn from a patient. When the needle is inserted into the patient, blood or other fluid is withdrawn through the needle, for example, into a collection bag. Handling of such needle-bearing medical devices after the needle is withdrawn from the patient can result in transmission of various pathogens, most notably human immune virus (HIV), thereby exposing medical personnel and possibly others to serious or fatal illness due to an inadvertent needle stick or scratch.
After use of a needle-bearing medical device, it is desirable to have an easily usable feature for retracting the needle into a housing to avoid contact with the small volume of contaminated fluid or blood that may remain on or inside the needle. It is further desirable that it be made difficult for personnel to accidentally or intentionally re-extend the needle from within the housing.
Accordingly, there is a need for a fluid transfer device that not only retracts the needle following its use, but that also captures or positively retains the needle in the retracted position within the housing thereafter.
In light of the foregoing, the present invention provides a medical device having a hollow housing and a needle with a sharpened tip. The needle is operable between an extended and a retracted position. The sharpened tip projects forwardly from the housing in the extended position and the sharpened tip is enclosed within the housing in the retracted position. A biasing element biases the needle toward the retracted position. A needle retainer releasably retains the needle in the extended position. An actuator actuates the needle retainer to release the needle so that the biasing element propels the needle rearwardly toward the retracted position. A rearward stop is operable to retain the needle against continued rearward displacement after the needle is retracted. A forward stop is operable to retain the needle against forward displacement after the needle is retracted. The needle is in fluid communication with a flexible conduit. The flexible conduit is in turn in fluid communication with an expandible reservoir. In this way, fluid flows from the patient, through the needle and into the expandible fluid reservoir. A pierceable seal forms a fluid-tight seal over the forward end of the housing after the needle is displaced into the retracted position.
The present invention also provides a safety sampling access port adapter for obtaining fluid samples in a fluid container having a pierceable seal from a fluid line having an access port with a pierceable fluid seal. The sampling adapter includes a housing having a first end adapted to cooperate with the access port and a collapsible socket. The socket has displaceable walls operable in a first position in which the socket is configured to receive the fluid container and a second position in which the walls are displaced inwardly to limit access to the socket. The device further includes a double-ended needle having a forward end for piercing the seal of the access port and a rearward end projecting into the collapsible socket for piercing the seal of the fluid container.
The following detailed description of the preferred embodiments according to the present invention will be better understood when read in conjunction with the accompanying drawings, in which:
Referring now to
The device 10 includes a needle assembly 40 slidably displaceable within the housing 20 between a projecting position in which the needle 30 projects forwardly from the housing 20, and a retracted position in which the needle is retracted within the housing. The needle assembly 40 includes a needle tube 60, the insertion needle 30 and a needle retainer 64. The needle 30 is fixedly connected to the needle tube 60 such as by adhesive or alternatively by a press fit or by insert molding. A coil spring 38 biases the needle assembly 40 toward the retracted position. In the projecting position, the needle retainer 64 releasably retains the needle assembly against the rearward bias of the spring 38.
In the present instance, the needle retainer comprises an elongated resilient arm 64 that is integrally formed with the needle tube 60. An actuation button 62 formed on the end of the arm 64 projects into an aperture in the side of the housing 20. The aperture forms a rim 42. Since the button 62 projects through the aperture the button is exposed to the user so that the user can manually actuate the button. A rear shoulder formed on the actuation button engages the rim 42 of the aperture to retain the needle assembly against rearward displacement.
The device 10 further includes forward and rearward stops to limit the retraction of the needle assembly 40 and to prevent re-extension of the needle 30 after retraction. The rearward stop is provided by a flange 66 or enlarged head formed on the forward end of the needle tube 60. The flange 66 projects radially outwardly from the needle tube. The flange 66 cooperates with an annular lip 44 formed at the rearward end of the housing 20. The lip 44 projects radially inwardly into the interior of the housing. The forward stop is provided by a latch 27 formed in the rearward end of the housing 20. The latch 27 is integrally formed with the housing 20 and projects radially inwardly into the interior of the housing. The latch 27 has a tapered forward surface and a rear shoulder substantially perpendicular to the forward surface of the flange 66. As the needle is displaced rearwardly during retraction, the flange 66 engages the tapered portion of the latch 27, displacing the latch radially outwardly. After the needle is retracted, the flange is disposed rearwardly of the latch 27 so that the latch resiliently returns to its original position in which it projects into the interior of the housing. Since the rearward end of the latch forms a square shoulder, displacing the needle forwardly after retraction displaces the flange 66 into engagement with the square shoulder of the latch. The square shoulder on the latch operates as a stop to impede forward displacement of the needle assembly 40 after retraction.
Retraction is actuated by manually depressing the actuation button 62 into the interior of the housing 20 until the actuation button is displaced out of engagement with the rim 42 of the aperture. In response to displacing the actuation button, the arm 64 deforms radially inwardly. Once the actuation button is out of engagement with the aperture, the spring 38 propels the needle assembly 40 rearwardly into the housing.
The resilient arm is biased radially outwardly so that button 62 is biased into engagement with the rim 42 of the aperture in the housing 20 in the latched position. The particular position shown in
As previously described, the needle 30 is in fluid communication with a flexible tube or fluid line 80 (shown in
The device 10 further includes a fluid-tight re-sealable seal 24 mounted on a boss 22 formed on the forward end of the housing. When the needle is disposed in the projecting position, as illustrated in
Configured as described above, the device operates as follows. The needle 30 is initially located in the projecting position. The medical professional pierces a blood donor's vein so that the needle 30 is in fluid communication with the vein. The blood flows through the needle, through the fluid line 80 and into the reservoir 85. As the blood flows into the reservoir 85, the reservoir expands. After a sufficient amount of blood has been withdrawn, the medical professional withdraws the needle from the patient. The actuation button is then depressed to actuate retraction of the needle. The spring 38 then propels the needle into the housing. Alternatively, the medical professional may actuate retraction prior to withdrawing the needle from the patient. In this way, the needle is enclosed by the housing as soon as it is withdrawn from the patient so that the medical professional is never exposed to the sharpened end of the contaminated needle.
Referring now to
Referring now to
To attach the sampling adapter 110 to the access port 83, the access port is inserted into the lower socket 125 so that the attached fluid line 80 engages the locking slots 127. The access port 83 is inserted deeply enough into the lower socket 125 so that the fluid line 80 engages the end of the first portion of the locking slot 127. The sampling adapter 110 is then rotated about its axis so that the fluid line 80 engages the transverse second portion of the locking slots 127. A detent 128 projects from the intersection of the first and second portions of the locking slots. The detent 128 impedes reverse rotation of the sampling adapter 110 relative to the fluid line 80, thereby operating as a lock to retain the sampling adapter on the access port.
The upper portion 130 is also generally cylindrical and has an opening so that the upper portion forms a socket adapted to receive the vacuum tube 87. The upper portion is formed of a plurality of wall segments 132 a, 132 b, 134 a, 134 b. The wall segments are displaceable relative to one another so that the upper portion 130 of the housing 120 can be collapsed after use to prevent contact with the contaminated needle. A plurality of grooves or relief lines 136 a, 136 b and 137 a, 137 b formed in the upper portion define the boundaries of the wall segments.
The grooves 136 a, 136 b, 137 a, 137 b are weakened areas of the upper portion 130 so that when a deformation force is applied to the upper portion, the upper portion will readily deform along the grooves. Accordingly, in response to a deformation force, the wall segments will deform about the grooves. In this way, the grooves form living hinges connecting adjacent wall segments.
The needle assembly 140 is mounted within the interior of the housing, so that the housing 120 completely encloses the needle assembly. Needle assembly 140 comprises a double-ended needle 142 fixedly attached to a needle hub 144. The needle hub 144 is fixedly connected to be interior of the housing 120 so that the needle 142 is fixed relative to the housing 120. The needle assembly 140 is disposed so that the forward sharpened tip of the double-ended needle projects into the interior of the lower socket 125, and the rearward sharpened tip projects into the interior of the upper socket 130. The needle assembly 140 further comprises a resiliently flexible boot 146 enclosing the rearward sharpened tip of the needle 142.
Configured in this way, the sampling adapter 110 is operable as follows. During fluid transfer, such as blood donation, fluid flows through the fluid line 80. To draw a sample from the fluid line, the medical professional attaches the sampling adapter 110 to the access port 83 (shown in
The terms and expressions which have been employed are used as terms of description and not of limitation. There is no intention in the use of such terms and expressions of excluding any equivalents of the features shown and described or portions thereof. It is recognized, however, that various modifications are possible within the scope and spirit of the invention.