EP-3939636-B1 - ASSISTANCE INSTRUMENT FOR SYRINGE

EP3939636B1EP 3939636 B1EP3939636 B1EP 3939636B1EP-3939636-B1

Inventors

SOMEKAWA, TSUYOSHI

Dates

Publication Date: 20260506
Application Date: 20200313

Claims (3)

A syringe auxiliary tool (1) comprising: a housing (2) that has a contact surface (200) that comes into contact with a living body and houses a syringe (80) with an injection needle (801) directed forward; a moving part (3) that engages with the syringe (80) housed in the housing (2) and attached to the housing (2) slidably in a front-rear direction, the moving part (3) being capable of changing its position, in association with the sliding, between an advanced position at which the injection needle (801) of the syringe is located forward of the contact surface (200) and a retracted position at which the injection needle (801) is located rearward of the contact surface (200); and an operation member (4) that is configured to slide the moving part (3) in a forward direction from the retracted position toward the advanced position, wherein the syringe auxiliary tool (1) further comprises a biasing means (S) that biases the moving part (3) in a retracting direction from the advanced position toward the retracted position, the operating member (4) comprises: an operating member body (40) that is pivotally attached to the housing (2); an activating part (41) that extends from the operation member body (40) and moves in the front rear direction in association with the pivotal movement of the operation member body (40); and a pressing part (42) disposed in the activating part (41), the operating member body (40) is formed by a lever extending outward from the housing (2) and is capable of, in association with the pivotal movement, switching between a raised position at which the lever is raised with respect to the housing (2) and a lowered position at which the lever is lowered with respect to the housing (2), the pressing part (42) is configured to move forward in the front-rear direction in association with the switching of the operation member body (40) from the raised position to the lowered position, and is configured to move forward in the front-rear direction to thereby press forward the moving part (3) to the advanced position.
The syringe auxiliary tool (1) according to claim 1, further comprising: _a blocking structure (7) that is capable of blocking the syringe (80) from moving forward in the state where the injection needle (801) is retracted in the housing (2), wherein the moving part (3) comprises a pressing operation engaging part (33) that is pressed forward in the front-rear direction by the operation member (4), and the pressing part (42) is configured: to engage with the pressing operation engaging part (33) from the rear side in the front-rear direction when the operation member body (40) is located at the raised position; to press forward the pressing operation engaging part (33) when the operation member body (40) is switching from the raised position to the lowered position; and to be released from the engagement with the pressing operation engaging part (33) when the operation member body (40) switches from the raised position to the lowered position.
The syringe auxiliary tool (1) according to claim 2, comprising the blocking structure (7) that is configured to block the moving part (3) from moving forward, the blocking structure (7) comprising: a block engaging part (70) that is disposed in the moving part (3); and a blocking part (71) that is disposed in the activating part (41) and is configured to allow the block engaging part (70) to engage with the blocking part (71) when the moving part (3) moves from the advanced position to the retracted position, wherein the syringe auxiliary tool (1) is configured such that: the pressing part (42) and the pressing operation engaging part are (33) in engagement with each other while the blocking part (71) and the block engaging part (70) are out of engagement with each other when the operation member (4) is located at the raised position; and when the operation member (4) switches from the raised position to the lowered position, the blocking part (71) and the block engaging part (70) engage with each other by the moving part (3) and the block engaging part (70) returning from the advanced position to the retracted position by a biasing force of the biasing means (S).

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to Japanese Patent Application No. 2019 - 048906. FIELD The present invention relates to a syringe auxiliary tool for ease of injection. BACKGROUND There was conventionally a sole use of a syringe for injection, but in this case, it was difficult to adjust the depth of the injection needle insertion into a living body. Therefore, various syringe auxiliary tools having an injection needle capable of being easily inserted into a living body at an appropriate depth to thereby enable easy injection. For example, a syringe auxiliary tool (or a drug delivery device) disclosed in Patent Literature 1 includes a lower housing that holds a syringe with a syringe needle protruding from a lower end of the lower housing, an upper housing that is externally fitted onto an upper end portion of the lower housing and is configured to be slid toward a lower end of the lower housing for pressing-in of a plunger of the syringe, a needle guard that is capable of advancing toward and retracting from the lower end of the lower housing so as to cover or expose the needle, and a needle guard return element that biases the needle guard toward a needle protruding side. This drug delivery device is configured to expose the needle by a predetermined length by retracting the needle guard, then, in this state, pierce the needle into a living body, and then push-in the upper housing to thereby perform an injection. Further, for example, a syringe auxiliary tool (injection device) disclosed in Patent Literature 2 includes a housing that has a distal end configured to be forced against a living body, a moving element disposed in the housing and configured to be capable of holding a hypodermic syringe, and to be attached to the housing slidably in a front-rear direction, a spring that biases the moving element toward a distal end side of the housing, and a locking mechanism capable of restricting the moving element, which has been slid toward the rear end side of the housing, from sliding toward the front side of the housing. According to this injection device, the moving element before use (before performing an injection), which is in the state of holding the hypodermic syringe, is disposed on the rear end side of the housing in advance, while being restricted from sliding toward the front side by a locking mechanism. When injecting using the injection device, the distal end of the housing is forced against the living body, and then the restriction of the sliding by the lock mechanism is released. This causes the moving element to slide toward the distal end side of the housing together with the hypodermic syringe under the influence of the biasing force of the spring to thereby allow a hypodermic needle of the hypodermic syringe to be pierced into the living body by a predetermined length. CITATION LIST Patent Literature Patent Literature 1: JP 6219353 BPatent Literature 2: JP 2016-525417 T SUMMARY Technical Problem Meanwhile, the conventional drug delivery device as aforementioned is configured to keep the needle exposed by the predetermined length, and thus may cause the needle, which has been accidentally pierced into the living body , not to be instantly pulled out of the living body. A similar problem may also occur with the injection device as aforementioned. Accordingly, there is a demand for enhanced safety during piercing of an injection needle in the conventional drug delivery device and the syringe auxiliary tool, such as the injection device as aforementioned. In view of the aforementioned circumstances, it is an object of the present invention to provide a syringe auxiliary tool capable of enhancing the safety during piercing an injection needle. Solution to Problem The syringe auxiliary tool of the present invention includes: a housing that has a contact surface that comes into contact with a living body and houses a syringe with an injection needle directed forward; a moving part that engages with the syringe housed in the housing and attached to the housing slidably in a front-rear direction, the moving part being capable of changing its position, in association with the sliding, between an advanced position at which the injection needle of the syringe is located forward of the contact surface and a retracted position at which the injection needle is located rearward of the contact surface;a biasing means that biases the moving part in a retracting direction from the advanced position toward the retracted position; andan operation member that is configured to slide the moving part in a forward direction from the retracted position toward the advanced position. The syringe auxiliary tool of the present invention further includes: a connecting part that connects the moving part with the operation member and slides the moving part in association with a movement of the operation member; anda restriction structure that restricts the moving part from sliding