Single use lancet assembly

[0002] The present application is a Continuation-In-Part application of previously filed, application having Ser. No. 09/432,351 which was filed on Nov. 2, 1999 and which is set to mature into U.S. Pat. No. 6,258,112 on Jul. 10, 2001.

[0003] 1. Field of the Invention

[0004] The present invention relates to a single use lancet assembly which is substantially compact, yet effective for piercing a patient's finger or other body part to obtain a blood sample. The single use lancet device is further configured to be substantially safe to transport and to ensure that subsequent uses of a contaminated lancet tip cannot occur.

[0005] 2. Description of the Related Art

[0006] Lancets are commonly utilized instruments which are employed both in hospitals and other medical facilities, as well as by private individuals, such as diabetics, in order to prick or pierce a patient's skin, typically on a finger of a patient, thereby leading to the generation of a blood sample which can be collected for testing. Because of the wide spread use of such lancets, there are a variety of lancet devices which are available for utilization by patients and/or practitioners in a variety of different circumstances.

[0007] For example, a typical lancet may merely include a housing with a sharp piercing tip that is pushed into the patient's skin. More commonly, however, lancet devices, which house a piercing tip and/or a lancet, have been developed which effectively encase and fire the lancet into the patient's skin, thereby eliminating the need for the person taking the sample to actually push the lancet tip into the skin.

[0008] Within the various types of specialized lancet devices, one variety are typically configured for multiple and/or repeated uses, while another category is particularly configured for single use, after which the entire device is disposed of. Looking in particular to the single use, disposable lancet devices, such devices typically include a housing which contains and directs or drives a piercing tip into the patient's skin, and which is disposed of along with the used lancet. Naturally, so to make such disposable devices cost effective for frequent use, such devices tend to be rather simplistic in nature providing only a sufficient mechanism for firing, and not overly complicating the design so as to minimize that cost.

[0009] While existing single use devices are generally effective for achieving the piercing of the skin required for effective operation, such single use, disposable devices typically do not incorporate a large number of safety features to ensure the safe use and disposal of the device. For example, one primary area of safety which must be addressed with all lancet devices pertains to the purposeful and/or inadvertent reuse of a contaminated lancet. Unfortunately, most currently available single use lancet devices are configured such that after a use thereof has been achieved, it is possible for a patient to recock the device, thereby allowing for a subsequent, inappropriate use.

[0010] As a result, it would be highly beneficial to provide a single use lancet device which is substantially compact and disposable, can be manufactured in a substantially cost effective manner, and which nevertheless is substantially safe to utilize, affirmatively preventing re-use, once contaminated.

[0011] The present invention relates to a single use lancet device configured to pierce a patient's skin and be useable only a single time, thereby preventing reuse of a contaminated lancet piercing tip. In particular, the present single use lancet device includes a housing having an open interior area and an access opening defined therein. The housing is preferably compact and includes a lancet disposed within its open interior.

[0012] Looking to the lancet, it is preferably of the type which includes a body and a piercing tip. It is the piercing tip which includes the pointed configuration structured to penetrate or pierce a patient's skin for the drawing of blood. Moreover, the lancet is cooperatively disposed within the open interior of the housing such that the lancet may move between at least a cocked orientation and a piercing orientation wherein the patient's skin is penetrated by the piercing tip.

[0013] Also operatively associated with the lancet is a driving assembly. The driving assembly is structured to move or drive the lancet, at least temporarily, into the piercing orientation from the cocked orientation. Preferably, however, the device is configured such that the cocked orientation is generally maintained until affirmatively released by a user. Along these lines, the present single use lancet device also includes an actuation button operatively associated with the lancet. The actuation button is structured to protrude from the housing, at least when the lancet is disposed in the cocked orientation, so as to be effectively actuatable. When the lancet is in the cocked orientation, the actuation assembly maintains the lancet in that cocked orientation, however, when it is actuated, such as by being pushed inward, the lancet is released from the cocked orientation and the driving assembly propels the lancet at least temporarily into its piercing orientation wherein the piercing tip protrudes through the access opening of the housing.

[0014] In order to ensure that lancet device can only be used a single time, the present single use lancet device further includes abutment structure cooperatively disposed between the housing and the lancet. The abutment structure is configured to prevent the lancet from moving into the cocked orientation after movement into the piercing orientation. Preferably, the abutment structure includes a shoulder element and a restrictor panel operatively associated with the lancet and the housing. In particular, the shoulder element is structured to pass over the restrictor panel when the lancet moves from its cocked orientation to its piercing orientation. Conversely, however, when a user attempts to move the lancet back into the cocked orientation after it moved into the piercing orientation, the restrictor panel abuts the shoulder element preventing further movement. As a result, movement of the lancet into the cocked orientation is prevented once the lancet has been used a single time, and subsequent uses of a contaminated lancet are prevented.

[0015] For a fuller understanding of the nature of the present invention, reference should be had to the following detailed description taken in connection with the accompanying drawings in which:

[0016] FIG. 1 is a perspective illustration of an embodiment of the single use lancet device of the present invention;

[0017] FIG. 2 is a side cross section view of the single use lancet device of the present invention in an unused, initially un-cocked orientation;

[0018] FIG. 3 is a side cross section view of the single use lancet device of the present invention in a cocked orientation;

[0019] FIG. 4 is a side cross section view of the single use lancet device of the present invention after it has moved into a piercing orientation from the cocked orientation;

[0020] FIG. 5 is a front cross section view of the single use lancet device of the present invention; and

[0021] FIG. 6 is a side cross section view of another embodiment of the single use lancet device of the present invention after the lancet has moved from the cocked orientation through the piercing orientation.

[0022] Like reference numerals refer to like parts throughout the several views of the drawings.

[0023] Shown throughout the Figures, the present invention is directed towards a single use lancet device, generally indicated as 10. In particular, the single use lancet device 10 of the present invention includes a housing, generally indicated as 20. The housing 20 is preferably substantially small and compact, and may be made of one or a plurality of segments, preferably of a generally rigid, disposable material, such as plastic. The housing 20 includes an at least partially open interior 28 and at least one access opening 22 defined therein. The open interior 28 of the housing 20 is preferably sized and configured to effectively receive a lancet, generally indicated as 30 therein.

[0024] The lancet 30 preferably includes a body 32 and a piercing tip 34. The piercing tip 34 is what will be used to pierce a person's skin so as to draw blood to be utilized for a sample and or test procedure. Moreover, the body 32 may be the shaft of the piercing tip 34 and/or an additional structure such as that depicted in the Figures. Regardless, however, the lancet 30 is structured to move within the open interior 28 of a housing 20, preferably at least between a cocked orientation, as depicted in FIG. 3, and a piercing orientation wherein the piercing tip 34 of lancet 30 at least temporarily protrudes through the access opening 22.

[0025] Looking in further detail to the illustrated lancet device 10, and the path of movement of the lancet 30 within the housing 20, when the lancet device 10 is initially obtained for use, the lancet 30 is preferably maintained in an un-used, initially un-cocked and pre-fired orientation, as best seen in FIG. 2. In this initially un-cocked and pre-fired orientation a protective cover 40 preferably extends into the open interior 28 of the housing 20 so as to at least partially and removably cover the piercing tip 34 of the lancet 30, thereby maintaining the safety and sterility of the piercing tip 34 when not being used. In this regard, the protective cover 40 may be formed from a variety of preferably rigid materials and is structured to protrude from the housing 20. Furthermore, the protective cover 40 may include an enlarged head 42 configured to facilitate grasping thereof.

[0026] Preferably utilizing the protective cover 40, the protective cover 40 is structured to be pushed inwardly into the housing by a user, as depicted by the arrows on FIG. 2, thereby pushing the lancet 30 further into the housing 20. Such pushing of the lancet 30 into the housing 20 results in a positioning of the lancet 30 in its cocked orientation, best illustrated in FIG. 3. Once in the cocked orientation, the protective cover 40 is then structured to be removable from the piercing tip 34, such as by a twisting thereof, thereby leaving the piercing tip 34 completely exposed for use.

[0027] The single use lancet of the present invention further includes a driving assembly, generally 38. The driving assembly 38 is particularly configured to move the lancet 30 at least temporarily into its piercing orientation wherein the piercing tip 34 protrudes through the access opening 22 of the housing 20 a desired amount. In particular, if desired, a depth adjustment structure could be positioned at the access opening to control the amount which the piercing tip protrudes from the housing 20. For example, a threaded washer type element could be adjustably secured to the housing 20 in generally surrounding relation to the access opening 22.

[0028] Looking further to the driving assembly, preferably the driving movement occurs when the lancet 30 is released from its cocked orientation. In the illustrated embodiment, the driving assembly 38 includes a biasing element operatively disposed between the lancet 30 and the housing 20. Moreover, in the illustrated embodiment a spring is preferably utilized, however, it is recognized that a variety of other driving assemblies can be utilized, including a wedge assembly, a hammer type assembly and/or a resilient material plate, segment or extension, all of which may be configured to move the lancet 30 from the cocked orientation into the piercing orientation. Further, it is preferred that based upon the sizing of the housing 20 and the nature and size of the driving assembly 38, that after the lancet 30 has moved into the piercing orientation wherein the piercing tip 34 protrudes through the access opening 22, the lancet tends to be retracted back into the housing, as best illustrated in FIG. 4. As a result, the used piercing tip 34 is effectively concealed within the housing 20 subsequent to usage, protecting against inadvertent engagement between a person and the used piercing tip 34.

[0029] In order to retain, and subsequently effectively release the lancet 30 from its cocked orientation, the single use lancet 10 of the present invention further includes an actuation assembly, generally, 50. Although a variety of different actuation assemblies may be incorporated so as to retain and then release the lancet 30 from its cocked orientation, which in the illustrated embodiment allows the driving assembly to be released from its compressed orientation, the actuation assembly 50 includes an actuation button 52. In the illustrated embodiment, the actuation button 52 is structured to at least temporarily protrude from the housing 20, such as through an actuation aperture 24. Furthermore, the actuation button 52 is preferably secured, either directly or indirectly to the lancet 30, so as to generally restrict movement of the lancet 30 from the cocked orientation when it protrudes from the housing 20. As a result, the cocked orientation is maintained while the actuation button protrudes from the housing 20. Specifically, in the illustrated embodiment, the actuation button 52 extends from the body 32 of the lancet 30 by a biased segment, and as such, by abutting the housing 20 within the actuation opening 24, movement of the lancet 30 from the cocked orientation is prevented. When, however, the actuation button 52 is actuated, such as by being pushed inwardly, into the housing, it is at least temporarily concealed within the housing 20, removing the abutting engagement and allowing the lancet 30 to freely move within the housing 20, at least temporarily into the piercing orientation. Although the preceding defines the illustrated actuation assembly, it is understood that a variety of alternative actuation assemblies, such as including separate elements to retain and to release the lancet may also be provided, and or including structures which are actually part of the driving assembly and/or remain at least partially exposed and actuatable at all times, may also be provided.

[0030] Looking in particular to FIG. 5, movement of the lancet 30 through the housing 20 is preferably maintained in a substantially linear path by a guide assembly. In the illustrated embodiment, the guide assembly includes at least one guide ridge 33 protruding from the body 32 of the lancet 30, and at least one corresponding guide track 25 structured to movably receive the guide ridge 33 therein. The guide track 25 preferably extends at least partially along a length of the open interior 28 of the housing 20 so as to maintain the guide ridge 33 effectively therein during a necessary range of motion of the lancet 30. As depicted in FIG. 5, preferably a pair of guide ridges 33 are disposed on opposite sides of the lancet body 32, with a corresponding pair of oppositely disposed guide tracks 25 being defined in the housing. It is of course, however, understood that the guide tracks 25 need not necessarily be directly defined in the housing 20, but may be additional elements secured therein, and conversely the guide track(s) may be defined in or on the lancet body 32, with the guide ridge(s) extending inwardly from the housing 20.

[0031] The single use lancet 10 of the present invention further includes a restrictor assembly, generally 60. The restrictor assembly 60 is structured to substantially prevent the lancet 30 from moving back into the cocked orientation of FIG. 3 after it has moved, even momentarily, into the piercing orientation wherein a patient's skin may be pierced and the piercing tip 34 become contaminated. In this regard, the cocked orientation may be defined by the lancet being positioned such that actuation of the actuation assembly causes the driving assembly to urge the lancet into the piercing orientation. In the illustrated embodiment, the restrictor assembly 60 is structured such that when the lancet 30 is disposed in the initially un-cocked orientation, as best seen in FIG. 2, movement of the lancet 30 back into the cocked orientation can effectively result despite the restrictor assembly 60. After, however, the lancet 30 has moved into its piercing orientation wherein the piercing tip 34 has protruded through the access opening 22 of the housing 20, the restrictor assembly is configured such that the lancet 30 can no longer be pushed back into the cocked orientation. As a result, a patient, can neither accidentally nor purposefully reuse the single use lance 10 of the present invention after it has been fired.

[0032] In the illustrated embodiment, the restrictor assembly 60 includes an abutment structure cooperatively disposed between the housing 20 and the lancet 30. The abutment structure is configured to physically prevent movement of the lancet back into the cocked orientation. Preferably, the abutment structure comprises a shoulder element 62 and a restrictor panel 64 configured to freely pass one another when the lancet 30 moves from the cocked orientation to the piercing orientation, but also configured to abut one another upon attempted movement of the lancet 30 back into the cocked orientation after it has moved into the piercing orientation. Looking to FIG. 4, the illustrated shoulder element 62 includes an at least partially slopped and preferably biased configuration, such as an elongate biased finger that at least partially retracts inward towards the body 32 of the lancet 30 so as to facilitate passage thereof past the restrictor panel 64. In this regard, preferably mating slopped surfaces are provided on the shoulder element 62 and the restrictor panel 64, thereby facilitating the sliding passages past one another, and indeed, promoting an at least partial retraction of the shoulder element 62 to further facilitate this passage past one another, upon movement of the lancet 30 in a first direction towards the access opening 22 of the housing 20. The shoulder element 62 is also, however, structured to generally expand after it has passed the restrictor panel 64, such as back into its normal unretracted and/or un-compressed orientation, such that it will abut the restrictor panel 64 upon attempted movement of the lancet 30 in a second direction opposite the access opening 22 of the housing 20.

[0033] Although an opposite configuration could be just as effectively utilized, in the illustrated embodiment, the biased finger of the shoulder element 62 extends from the lancet 30, preferably generally toward the piercing tip 34 of the lancet 30, while the restrictor panel 64 protrudes from the housing 20, extending into the open interior 28 of the housing 20. Along these lines, the restrictor panel 64 includes a protruding element preferably with the aforementioned slopped configuration which downwardly slopes away from the piercing tip 34 of the lancet 30 facilitating the aforementioned sliding passage past the shoulder element 62.

[0034] So as to provide generally secure movement restriction through effective abutment, both the shoulder element 62 and the restrictor panel 64 each preferably include abutment surfaces 63 and 65, respectively. The abutment surfaces 63 and 65 are structured to generally engage and abut one another, as best illustrated in FIG. 4, thereby preventing movement of the lancet 30 back into the cocked orientation. In the illustrated embodiment, the abutment surfaces 63, 65 are generally flat, although it is recognized that interlocking fingers or wedges, and/or other types of engaging structures that prevent relative movement in at least one direction could also be effectively utilized.

[0035] Addressing further the restrictor assembly of the present invention, it is understood that a variety of different restrictor assemblies may be effectively utilized which prevent movement of a lancet 30 back into a cocked orientation after the lancet 30 has moved sufficiently forward and/or has moved into the piercing orientation. As such, the embodiment illustrated in FIGS. 2 through 5 is merely a single illustration of a preferred contemplated embodiment, and other alternative embodiments are also considered within the scope of the restrictor assembly of the present invention. By way of example, and looking specifically to FIG. 6, the actuation button 52 itself may comprise part of the restrictor assembly. In such an embodiment, a restrictor panel 25 is defined in the housing 20, and the actuation button 52 as part of the biased finger of the shoulder element, includes an abutment surface 54 which engages a confronting surface of the restrictor panel 25. In such an embodiment, the initially un-cocked orientation provides for the actuation button 52 to be initially disposed rearward of the restrictor panel 25 so as to permit movement of the lancet 30 at least initially into the cocked orientation. Moreover, in this embodiment, the previous embodiment, and/or any other alternative embodiment, if desired, the protective cover 40 may be equipped with an interior shield segment or other configuration which extends into the housing and maintains the biased finger of the shoulder element 62, or another component of the restrictor assembly, in a generally compressed and/or retracted orientation until the protective cover 40 is removed. As a result, in such an embodiment, so long as the protective cover 40 is maintained on the piercing tip 34, the lancet 30 is always able to return to the cocked orientation. Preferably, however, re-positioning of the protective cover onto the piercing tip in such a manner as to be able to “reset” the lancet 30, allowing it to move once again into the cocked orientation will be prevented.

[0036] Since many modifications, variations and changes in detail can be made to the described preferred embodiment of the invention, it is intended that all matters in the foregoing description and shown in the accompanying drawings be interpreted as illustrative and not in a limiting sense. Thus, the scope of the invention should be determined by the appended claims and their legal equivalents.

[0037] Now that the invention has been described,