Lancet

A lancet comprising:

• an inner sleeve;
• a needle core;
• a housing extending along a longitudinal axis from a first side to a second side, the housing comprising an inner sleeve guiding portion extending along the longitudinal axis from the first side towards the second side and configured to guide movement of the inner sleeve, and a first needle core guiding portion configured to guide movement of the needle core;
• the inner sleeve provided inside the housing and configured to move along the inner sleeve guiding portion, wherein the inner sleeve comprises an inner sleeve needle outlet provided on a front end of the inner sleeve, and a second needle core guiding portion;
• the needle core comprising a needle core body configured to move axially along the first needle core guiding portion, and a needle body;
• and
• a spring provided inside the housing to drive the needle core to move axially towards the inner sleeve needle outlet,
• wherein:
• the first needle core guiding portion is a first needle core guiding groove which extends axially along the housing;
• the second needle core guiding portion extends axially and is a second needle core guiding groove;
• the housing further comprises a rotation guiding groove which has a radial rotation angle and is disposed at a position closer to the second side of the housing than the inner sleeve guiding portion, and which is configured to guide a guiding protrusion at a rear end of the inner sleeve so as to guide the inner sleeve to rotate with the radial rotation angle at the rotation guiding groove;
• the inner sleeve, when pressed from the front end of the inner sleeve towards the inside of the housing, is configured to be guided by the rotation guiding groove to rotate such that the first needle core guiding portion is aligned with the second needle core guiding portion in a radial direction;
• the rotation guiding groove comprises a limiting end face perpendicular to an axial direction;
• the guiding protrusion is configured to cooperate with the inner sleeve guiding portion and with the rotation guiding groove, and the inner sleeve guiding portion is a guiding groove;
• and the radial rotation angle of the rotation guiding groove is between 25° and 35° and the inner sleeve is configured to be axially displaced by 2.5 mm-3.5 mm based on the guidance of the entire rotation guiding groove.

A lancet comprising:

• an inner sleeve;
• a needle core;
• a housing extending along a longitudinal axis from a first side to a second side, the housing comprising an inner sleeve guiding portion extending along the longitudinal axis from the first side towards the second side and configured to guide movement of the inner sleeve, and a first needle core guiding portion configured to guide movement of the needle core;
• the inner sleeve provided inside the housing and configured to move along the inner sleeve guiding portion, wherein the inner sleeve comprises an inner sleeve needle outlet provided on a front end of the inner sleeve, and a second needle core guiding portion;
• the needle core comprising a needle core body configured to move axially along the first needle core guiding portion, and a needle body;
• and a spring provided inside the housing to drive the needle core to move axially towards the inner sleeve needle outlet,
• wherein:
• the first needle core guiding portion is a first needle core guiding groove which extends axially along the housing;
• the second needle core guiding portion extends axially and is a second needle core guiding groove;
• the housing further comprises a rotation guiding groove which has a radial rotation angle and is disposed at a position closer to the second side of the housing than the inner sleeve guiding portion, and which is configured to guide a guiding protrusion at a rear end of the inner sleeve so as to guide the inner sleeve to rotate with the radial rotation angle at the rotation guiding groove;
• the inner sleeve, when pressed from the front end of the inner sleeve towards the inside of the housing, is configured to be guided by the rotation guiding groove to rotate such that the first needle core guiding portion is aligned with the second needle core guiding portion in a radial direction;
• the inner sleeve further comprises an abutment end face perpendicular to an axial direction at the rear end of the inner sleeve adjacent to the second needle core guiding portion;
• the needle core body is configured to abut against the abutment end face;
• a rotational movement of the inner sleeve causes the needle core body to be out of contact with the abutment end face and to move axially along the second needle core guiding portion;
• the guiding protrusion is configured to cooperate with the inner sleeve guiding portion and with the rotation guiding groove, and the inner sleeve guiding portion is a guiding groove;
• and
• the housing comprises an inner sleeve positioning surface, provided between the inner sleeve guiding portion and the rotation guiding groove, the guiding protrusion is provided with a first guiding ramped surface and a first vertical blocking surface, wherein when the guiding protrusion moves towards the rotation guiding groove, the first guiding ramped surface is configured to contact the inner sleeve positioning surface to allow the guiding protrusion to pass over the inner sleeve positioning surface, and after the guiding protrusion passes over the inner sleeve positioning surface, the first vertical blocking surface is configured to prevent the guiding protrusion from passing back over the inner sleeve positioning surface.

A lancet comprising:

• an inner sleeve;
• a needle core;
• a housing extending along a longitudinal axis from a first side to a second side, the housing comprising an inner sleeve guiding portion extending along the longitudinal axis from the first side towards the second side and configured to guide movement of the inner sleeve, and a first needle core guiding portion configured to guide movement of the needle core;
• the inner sleeve provided inside the housing and configured to move along the inner sleeve guiding portion, wherein the inner sleeve comprises an inner sleeve needle outlet provided on a front end of the inner sleeve, and a second needle core guiding portion to guide the movement of the needle core;
• the needle core comprising which comprises a needle core body configured to move axially along the first needle core guiding portion, and a needle body;
• and
• a spring provided inside the housing to drive the needle core to move axially towards the inner sleeve needle outlet,
• wherein:
• the first needle core guiding portion is a first needle core guiding groove which extends axially along the housing;
• the second needle core guiding portion extends axially and is a second needle core guiding groove;
• the housing further comprises a rotation guiding groove which has a radial rotation angle and is disposed at a position closer to the second side of the housing than the inner sleeve guiding portion, and which is configured to a guiding protrusion at a rear end of guide the inner sleeve so as to guide the inner sleeve to rotate with a radial rotation angle at the rotation guiding groove;
• the inner sleeve, when pressed from the front end of the inner sleeve towards the inside of the housing, is configured to be guided by the rotation guiding groove to rotate such that the first needle core guiding portion is aligned with the second needle core guiding portion in a radial direction;
• the guiding protrusion is configured to cooperate with the inner sleeve guiding portion and with the rotation guiding groove, and the inner sleeve guiding portion is a guiding groove;
• the inner sleeve further comprises an abutment end face perpendicular to an axial direction at a rear end of the inner sleeve adjacent to the second needle core guiding portion;
• the needle core body is configured to abut against the abutment end face;
• a rotational movement of the inner sleeve causes the needle core body to be out of contact with the abutment end face and to move axially along the second needle core guiding portion;
• the rotation guiding groove comprises a limiting end face perpendicular to an axial direction;
• and
• the inner sleeve is configured to be axially displaced by 2.5 mm-3.5 mm based on the guidance of the entire rotation guiding groove.