Lancet for skin pricker

The Invention relates to skin pricker. It is an invention in the<patcit><text>EP-B-0634000</text></patcit> described is concerned and with the guarantee that the lancet, once it is shot down, not pushed back over the needle tip opening, cocked back and can be fired again.

According to the present Invention is a lancet for created a skin pricker comprising a plastic body, which is provided with a breakaway cap and a needle in a part is injection molded, the cap having an elongate shaft, the is aligned with the needle and provided with an end the Needlepoint wrapped, which is exposed when the cap is removed. The shaft has a Weakened zone, the bulging when a longitudinally acting on the cap Pressure force reaches a predetermined value.

The weakened zone is best formed by at least one notch in the shaft engages, but preferably two notches on opposite Sides, in the longitudinal direction of the Stem staggered. Other possibilities are, that a Cross-hole extends through the shaft or the latter with a neck is trained.

To the understanding of the invention are some embodiments in the following by way of example with reference to the accompanying Drawings. In the drawings:

<figref idrefs="S7">1</figref> a axial section of skin engraver after the lancet shot has been,

<figref idrefs="S7">2</figref> a similar Sectional view, an attempt to retract the lancet after firing showing

<figref idrefs="S8">3</figref> on Axial section of another skin engraver before the lancet shot becomes,

<figref idrefs="S8">4</figref> a similar Sectional view of the lancet of <figref idrefs="S8">3</figref> after this Shoot down,

<figref idrefs="S9">5</figref> a Side view of a skin engraver with a safety cap for the needle tip, and

<figref idrefs="S9">6</figref> a similar Side view of the cap while attempting a shot down lancet withdraw.

The means of <figref idrefs="S7">1</figref> and <figref idrefs="S7">2</figref> has a run <figref>1</figref> of two halves , which at one longitudinal slot are connected to a lancet <figref>2</figref> take. The lancet has a plastic body on which a needle <figref>3</figref> envelops, headed initially in a twist-off, elongated cap <figref>4</figref> is embedded, the injection-molded with the body in one piece is. The cap serves the same purpose as in the<patcit><text>EP-B-0634000</text></patcit>, The spring, the lancet forward drives, and the trigger, which it releases, are not shown for simplicity.

Of the Lancet body has a great head <figref>5</figref>, Which is rotatably guided in the forward part of the barrel. A shaft <figref>6</figref> extending from the head to the rear, into a mold <figref>7</figref> to end, which receives the front end of the spring. At opposite lead sides of the shaft finger <figref>8th</figref> outward and from the roots of the shoulders at the transition between the head <figref>5</figref> and the shaft <figref>6</figref> backwards. They end in extensions<figref>9</figref>, Being familiar with the plastic body are injection molded in one piece, they are acting resiliently like feathers.

About in the middle of its length expands the interior of the barrel <figref>1</figref> toward the back to the opposite pages about gradual slopes <figref>10</figref>That directed in inward and forward bevel hook <figref>11</figref> end up.

Initially located when the spring is relaxed, the extensions <figref>9</figref> Behind the hook <figref>11</figref>, The cap<figref>4</figref> is depressed thereby retract the lancet, and the device is then stretched. The cap is twisted off recognized and the establishment and shot. The on the spring oppressive pressure pushes forward the lancet, and the fingers <figref>8th</figref> to bend inwardly when the extensions <figref>9</figref> behind the hook <figref>11</figref> by snapping, immediately before the needle tip from the currently front End of the barrel outlet. If the overstretched spring retracts, slide the extensions <figref>9</figref> while on the slopes <figref>10</figref>. until the of the hook <figref>11</figref> formed hook bodies in Engagement occur. Effective by a ratchet mechanism is formed.

These Position is in <figref idrefs="S7">1</figref> shown, wherein the cap <figref>4</figref> to Repatriation of Device is pushed back in its tensioned state.

If However, the cap is pushed further, while the main body of the Lancet, at least initially moving the fingers <figref>8th</figref> captured. They are then, as in <figref idrefs="S7">2</figref> shown bulged, so that is zuspitzendes backward V created and formed in this way wedges between them the hook <figref>11</figref> and the shaft <figref>6</figref> terminals. The extensions<figref>9</figref> put ensures that the Ends of the fingers <figref>8th</figref> not released from the hook.

On This will lock the lancet &lt;?page 3?&gt;and immobilized before the clamping position is reached, and re-firing is prevented.

The in the <figref idrefs="S8">3</figref> and <figref idrefs="S8">4</figref> Device shown is in many ways of the <figref idrefs="S7">1</figref> and <figref idrefs="S7">2</figref> shown similar, so that appropriate Parts are provided with the same reference numbers.

Of the main difference is in the spring fingers, now with <figref>18</figref> designated are. They extend from the tips of the shoulders at the transition between the head <figref>5</figref> and the shaft <figref>6</figref> back and normally are parallel to and spaced separated from Shaft. They end in outwardly extended tips<figref>19</figref>,

Of the Ratchet operation is similar to that described. If the lancet shot will grab the points <figref>19</figref> towards the end of its forward movement on the hook <figref>11</figref> past, said arms <figref>18</figref> currently bend inwards. The setback the lancet leaves the tips <figref>19</figref> in the loosely engaged with the hooks. Any backward force applied to the lancet acting, reinforced this engaged and the rearward movement the lancet through the arms <figref>18</figref> resisted set, whereby at low compressibility longitudinally stay straight. However, once again the backward force a certain level reached, they begin to bend and spring arms through the engagement of the tips with the hooks on the outside the main length the arms, as in the dotted lines <figref idrefs="S8">4</figref> shown, inward and not outward. The tips <figref>19</figref> spread outwardly as well as rearwardly into the acute angle of the hook <figref>11</figref> in and can therefore Jump less likely from the hook out. If on the arms acts even more power, so they bulge thereby and wedge as in the previous embodiment.

These Facilities are legally notwenig small, and the size of the hook <figref>11</figref> as the arms which engage with them, is correspondingly low. They function as described if a moderate rearward force acts on the lancet after firing, and indeed certain pressure can the engagement on the hook <figref>11</figref> cancel and the establishment tighten again. The obvious means for applying the pressure the elongated cap <figref>4</figref>That immediately prior to use, however, apparently not fully destroyed is.

As a further safety measure, which is applicable not only to the embodiments just described, the cap can be constructed so that it to retract the lancet after firing is unusable. In the example of<figref idrefs="S9">5</figref> and <figref idrefs="S9">6</figref> are in opposite sides something axially different locations around the Mid-length the shank of the cap notches <figref>20</figref> and <figref>21</figref> in shape a zigzag formed. The cap<figref>4</figref> is for the initial Tensioning of the device against the spring stable enough, but when the lancet through the hook <figref>11</figref> is held, bulges the cap, as in <figref idrefs="S9">6</figref> shown off before the hook <figref>11</figref> or the tips of the arms <figref>8th</figref> or <figref>18</figref> come free.

A different possibility the weakening of the Cap that may be preferred is simply a cross-bore provide through it about the middle of its length. alternative can a notch sufficient or they can be provided with a neck will.

at the embodiments described is the lancet symmetrically constructed with spring arms <figref>8th</figref> or <figref>18</figref> on opposite sides. Although this embodiment is preferred, it would be possible, the to build lancet so and to lead, that only one arm is sufficient.