JP4500109B2 - Puncture tool - Google Patents

Description

  The present invention relates to a puncture device used for collecting blood from a fingertip or the like prior to measuring blood collection or the like.

  Conventionally, various puncture devices for collecting blood from human or animal skin have been invented for blood analysis, and in recent years, a puncture needle is attached to the puncture device and at the same time an urging force for puncture is stored. A puncture device has also been invented (see, for example, Patent Document 1). Such a puncture device performs puncture and removal operations using two compression springs, that is, a first compression spring for puncture and a second compression spring for removal.

FIG. 4 is a side view of a conventional puncture device. In FIG. 4, the natural position of the plunger 32 is regulated by the entire length of the first compression spring 30, and when puncturing, the plunger 32 is urged toward the distal end by the restoring force of the first compression spring 30. At the time of extraction, the second compression spring 31 is biased toward the rear end by the restoring force.
JP 2000-245717 A

  However, when two compression springs are used as in the conventional puncture device, it is necessary to ensure the overall length accuracy of the first compression spring that determines the natural position of the plunger. Since it is very difficult to ensure the accuracy of the overall length in terms of its form, in order to ensure product accuracy, it is necessary to ensure the necessary dimensions by precisely polishing both ends of the first compression spring 30. There was a problem that it was not possible. Further, it is necessary to consider the distribution of the force that can be punctured and the force that surely returns the puncture needle, and the altitude for optimizing the ratio of the spring pressures of the first compression spring 30 and the second compression spring 31. Technology was needed. Further, when two compression springs are used as the urging means of the plunger 32, reciprocation by the compression springs, that is, howling occurs, and the puncture needle pierces the skin a plurality of times due to howling, resulting in amplification of pain. It is painful for the patient. In addition, recent research on patients has revealed that not only pain during puncture but also the impact sound of the puncture tool further amplifies the patient's fear.

  In order to solve the above-mentioned problems, a puncture device according to claim 1 of the present invention holds a puncture needle in a housing having an opening at a front end in a detachable manner and is slidable in the front-rear direction of the housing. And a pulling spring for urging the plunger in the front-rear direction, wherein the plunger is provided with a sloped portion projecting obliquely toward the rear end of the housing. The front end of the spring is fixed to a first tension spring fixing piece fixed in the housing, and the rear end of the tension spring is inserted into the slope portion and is slidable in the oblique direction along the slope portion. The second tension spring fixing piece is hooked on the second tension spring fixing piece, and the second tension spring fixing piece moves to the rear end side in conjunction with the movement of the plunger toward the rear end side to move the tension spring in the axial direction. The tension spring is extended in its axial direction The plunger is urged toward the front end of the housing via the second tension spring fixing piece by the restoring force generated by the extension, and the plunger moves to the tip side beyond the position where the tension spring becomes a natural length. When urged, the second tension spring fixing piece slides in the upward oblique direction along the inclined portion to deform the tension spring in the upward oblique direction, and the tension spring moves in the upward oblique direction. The second pulling spring fixing piece is pressed in the downward oblique direction by the restoring force generated by the deformation of the above, and the plunger is biased in the rear end direction.

  The puncture device according to claim 2 of the present invention is the puncture device according to claim 1, wherein the housing is provided with a first projection on an inner wall surface thereof, and the plunger is provided with the first projection. A second protrusion that engages with the protrusion is provided, and when the first protrusion and the second protrusion are engaged with each other, urging of the plunger toward the distal end of the plunger by the pulling spring is restricted, and The pulling spring biases the plunger toward the front end of the housing by pressing the second protrusion to release the engagement between the first protrusion and the second protrusion.

  The invention according to claim 3 of the present invention is the puncture device according to claim 1 or 2, wherein the first tension spring fixing piece has a predetermined length from the front end of the tension spring. A tension spring is encapsulated, and deformation of the encased tension spring in a direction other than the axial direction is restricted.

  According to the puncture device of the present invention, one end of the tension spring is fixed to the housing via the first tension spring fixing piece, and the other end of the tension spring is slidably inserted into the slope portion provided on the plunger. Since the second tension spring fixing piece is engaged with the second tension spring fixing piece, the second tension spring fixing piece is moved to the rear end side in conjunction with the movement of the plunger toward the rear end side, and the pulling is performed. A spring is extended in the axial direction, and the plunger can be urged toward the front end of the housing via the second tension spring fixing piece by a restoring force generated by the extension. When the plunger is urged to the tip side beyond the natural length position, the second tension spring fixing piece is slid in the upward oblique direction along the inclined portion to cause the tension spring to tilt upward. Deformation in the direction and restoring force generated by such deformation Further, the plunger can be urged in the rear end direction by pressing the second pulling spring fixing piece in the diagonally downward direction, thereby urging the plunger in the front end direction and the rear end direction. The means can be constituted by one pulling spring, so that the manufacturing process of the puncture device can be simplified and the puncture needle can be prevented from being pierced multiple times.

(Embodiment 1)
The configuration of the puncture device according to the present invention will be described with reference to FIGS. 1 and 2. Note that the same reference numerals are used for the same components in FIGS.

  FIG. 1 is a configuration diagram showing a puncture device of the present invention, and FIG. 2 is a side view showing a tip portion of the puncture device.

  In FIG. 1, the puncture device of the present invention mainly includes a housing 1 and a plunger 3 that is slidably held inside the housing 1.

  The housing 1 includes a housing 1a having an opening at the front end and a housing 1b having a closed rear end. As shown in FIG. 2, the housing 1a is rotatably fitted to the housing 1b. ing. Inside the housing 1, a first protrusion 2 and a needle depth adjusting unit 7 for adjusting the protruding position of the puncture needle 14 are provided. The needle depth adjusting unit 7 moves the housing b from the housing a. By being rotated, the housing 1 is configured to be movable in the front end direction and the rear end direction inside the housing 1. An operation button 4 is provided above the first protrusion 2.

  The plunger 3 includes a puncture needle holding part 3a, a second protrusion 3b, a sliding restricting part 3c, a base part 3d, and a slope part 3e from the tip part. The lancet 13 is detachably fitted to the puncture needle holder 3a. As shown in FIG. 2, the puncture needle cartridge 5 holds a lancet 13 that holds the puncture needle 14 slidably, and a protective cap 6 that protects the puncture needle 14 is provided at the tip of the lancet 13. . When using the puncture device, the protective cap 6 is removed, but since the puncture needle 14 is located inside the puncture needle cartridge 5, the user of the puncture device performs puncture without looking at the needle and feeling no fear. It can be carried out. Further, as shown in FIG. 2, the gap between the distal end portion of the plunger 3 and the housing 1a is reduced, and the rear end portion of the housing 1b is sealed so that the impact sound at the time of puncture is confined to alleviate the fear of the patient. Yes.

  The second protrusion 3 b is provided in a region where the plunger 3 can be elastically deformed, and engages with the first protrusion 2. The sliding regulation part 3 c regulates the sliding of the plunger 3 in the distal direction by contacting the needle depth adjusting part 7.

  The base portion 3d is provided with a slope portion 3e that inclines and protrudes toward the rear end of the housing 1, and a pulling spring 8 that applies a biasing force in the front-rear direction to the plunger 3 is provided above the base portion 3d. And the 1st tension spring fixing piece 9 and the 2nd tension spring fixing piece 10 which respectively latch both ends of the tension spring 8 are arrange | positioned.

  The first tension spring fixing piece 9 is fixed to the housing 1b via a fixing pin a11 and latches the front end of the tension spring 8 (not shown). The first tension spring fixing piece 9 includes a cylindrical portion, and a tension spring encapsulated in the cylindrical portion by encapsulating the tension spring 8 having a predetermined length in the cylindrical portion. 8 is fixed so that it cannot be deformed other than extending in the axial direction.

  The second tension spring fixing piece 10 is slidably hooked on the rear end side of the tension spring 8 by a fixing pin b12, and the second tension spring fixing piece 10 is an inclined surface portion 3e formed on the plunger 3. And can slide in the oblique direction along the slope 3e.

  The operation of puncturing using the puncture device configured as described above will be described below with reference to FIG. FIG. 3 is a diagram illustrating a state of the tension spring 8 and the second tension spring fixing piece 10 when the plunger 3 is in the natural position, the puncture preparation position, and the puncture position.

  Here, in FIG. 3, the natural position represents the position of the plunger 3 in the state where the tension spring 8 is in the natural length, and the puncture preparation position refers to the plunger 3 being pressed toward the rear end side of the housing 1. When the tension spring 8 extends in the axial direction and the first protrusion 2 and the second protrusion 3b engage with each other, the position of the plunger in a state where the biasing of the plunger 3 in the distal direction is locked is achieved. The puncture position indicates that the engagement between the plunger 3 and the housing 1 is released, the plunger 3 is biased toward the distal end, and the plunger 3 moves beyond the natural position toward the distal end due to the inertial force of the plunger 3. This represents the position of the plunger 3 in the state.

  In a state where the plunger 3 is in the natural position, the lancet 13 is attached to the puncture needle holding portion 3a of the plunger 3, and the plunger 3 is pressed toward the rear end. In conjunction with the movement of the plunger 3 in the rear end direction, the second tension spring fixing piece 10 also moves in the rear end direction, whereby the tension spring 8 is expanded in the axial direction.

  When the plunger 3 is further pushed into the housing 1, the first protrusion 2 provided on the housing a and the second protrusion of the plunger 3 are engaged, and the biasing of the plunger 3 in the distal direction is locked, Thereby, the plunger 3 becomes a puncture preparation position.

  When the operation button 4 provided on the housing 1a is pressed, a predetermined region of the plunger 3 provided with the second protrusion 3b is elastically deformed and the engagement between the first protrusion 2 and the second protrusion 3b is released, As a result, the plunger 3 is urged vigorously in the distal direction by the restoring force of the tension spring 8.

  When the plunger 3 is urged toward the distal end, the pulling spring 8 contracts and becomes a natural length, and the plunger 3 returns to the natural position, but the plunger 3 moves further toward the distal end beyond the natural position due to its inertial force. Therefore, the second tension spring fixing piece 10 slides in the upward oblique direction along the inclined surface portion 3e, and the tension spring 8 is moved upward with the end portion of the cylindrical portion of the first tension spring fixing piece 9 as a fulcrum. It is deformed and extended in the oblique direction, whereby the plunger 3 becomes a puncture position and puncture is performed.

  When the plunger 3 is in the puncture position, the pulling spring 8 has a restoring force in the direction of the arrow B, and the second pulling spring fixing piece 10 is pressed in the downward oblique direction along the inclined surface portion 3e. Further, when the second tension spring fixing piece 10 is pressed in the downward oblique direction, a force in the direction of arrow C acts on the plunger 3, whereby the plunger 3 slides in the rear end direction and moves to the natural position. Returning to, the puncturing operation is completed.

  As described above, according to the puncture device according to the first embodiment, the front end of the tension spring 8 is fixed to the housing 1 via the first tension spring fixing piece 9, and the rear end of the tension spring 8 is Since the second tension spring fixing piece 10 is slidably inserted into the slope portion 3e provided on the plunger 3, the second tension spring fixing piece 10 is attached to the rear of the plunger 3. The pulling spring 8 is moved in the axial direction by moving to the rear end side in conjunction with the movement toward the end side, and the plunger 3 is moved to the second pulling spring fixing piece 10 by the restoring force generated by the extension. When the plunger 3 is urged to the front end side beyond the position where the tension spring 8 becomes a natural length, the second pulling can be performed. The spring fixing piece 10 is inclined upward along the slope portion 3e. By sliding, the pull spring 8 is deformed in the upper oblique direction, and the second pull spring fixing piece 10 is pressed in the lower oblique direction by the restoring force generated by the deformation to attach the plunger 3 in the rear end direction. As a result, the urging means for urging the plunger in the front end direction and the rear end direction can be constituted by one pulling spring, which simplifies the manufacturing process of the puncture tool and punctures it. It becomes possible to prevent the needle 14 from being pierced multiple times.

  The puncture device according to the present invention is useful in that the manufacturing process of the puncture device can be simplified, and the patient's pain can be reduced by reliably preventing multiple punctures.

It is a figure showing the structure of the puncture device in Embodiment 1 of this invention. It is a side view of the front-end | tip part of the puncture device in Embodiment 1 of this invention. It is a figure showing the movement of a plunger and the state of a tension spring in Embodiment 1 of this invention. It is sectional drawing of the conventional puncture device.

Explanation of symbols

1 Housing 1a Housing a
1b Housing b
2 1st protrusion 3 Plunger 3a Puncture needle holding part 3b 2nd protrusion 3c Sliding regulation part 3d Base part 3e Slope part 4 Operation button 5 Puncture needle cartridge 6 Needle protection cap 7 Needle depth adjustment part 8 Pull spring 9 1st Pulling spring fixing piece 10 Second pulling spring fixing piece 11 Fixing pin a
12 Fixing pin b
13 Lancet 14 Puncture Needle 30 First Compression Spring 31 Second Compression Spring 32 Plunger 33 Energizing Lever

Claims (3)

In a housing having an opening at a front end, a puncture needle is detachably held, a plunger is slidably held in the front-rear direction of the housing, and a pulling spring that biases the plunger in the front-rear direction. A puncture device,
The plunger is provided with a sloped portion projecting obliquely toward the rear end of the housing,
The front end of the tension spring is fixed to a first tension spring fixing piece fixed in the housing,
The rear end of the tension spring is inserted into the slope portion and is hooked to a second tension spring fixing piece that can slide in the oblique direction along the slope portion,
The second tension spring fixing piece moves to the rear end side in conjunction with the movement of the plunger toward the rear end side to extend the tension spring in the axial direction, and the tension spring moves in the axial direction. The plunger is urged toward the front end of the housing via the second tension spring fixing piece by a restoring force generated by extension,
When the plunger is urged to the tip side beyond the position where the tension spring becomes a natural length, the second tension spring fixing piece slides in the upper oblique direction along the inclined portion and The pulling spring is deformed in the upward oblique direction, and the pulling spring presses the second pulling spring fixing piece in the downward oblique direction by the restoring force generated by the deformation in the upward oblique direction to attach the plunger in the rear end direction. Fast,
A puncture device characterized by that. The puncture device according to claim 1, wherein
The housing is provided with a first protrusion on its inner wall surface,
The plunger is provided with a second protrusion that engages with the first protrusion,
Engagement of the first protrusion and the second protrusion restricts urging of the plunger toward the tip of the plunger by the pulling spring, and presses the second protrusion to press the first protrusion. And the second protrusion disengages the pulling spring to urge the plunger toward the front end of the housing.
A puncture device characterized by that. The puncture device according to claim 1 or 2,
The first tension spring fixing piece encloses the tension spring of a predetermined length from the front end of the tension spring, and restricts deformation of the enveloped tension spring other than in the axial direction.
A puncture device characterized by that.

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