Abstract: An apparatus for downhole multi-dimensional imaging includes an acquisition unit configured to acquire a formation resistivity signal, an ultrasonic echo signal and an orientation signal regularly; a sector calculation unit configured to calculate, based on said orientation signal, a sector where a currently acquired signal is from; and a multi-dimensional imaging unit, configured to calculate, based on the signals acquired by the acquisition unit, data of resistivity, distance from a drilling tool to a borehole wall and ultrasonic echo amplitude, and distribute said data into all sectors for feature recognition and extraction, thus obtaining key features characterizing a current formation being drilled, said key features being transmitted to ground for guiding drilling process. The structural complexity and the length of the downhole imaging measurement instrument can be reduced, and feature recognition can be directly performed on the imaging data underground.

Abstract: A manually-retractable intravenous infusion needle assembly, including a needle holder, a needle tube, a built-in slidable sheath and a protective casing, where the needle holder includes a tubular portion and a tailstock portion; a rear end of the needle tube is mounted inside the tubular portion; the built-in slidable sheath is through and elongated and has a C-shaped cross-section; the tubular portion is mounted inside the built-in slidable sheath and can slide back and forth; the protective casing is an elongated, through and hollow casing; the built-in slidable sheath is mounted inside the protective casing. A locking structure is provided between the needle holder and the protective casing.

Abstract: An auto-retractable blood collection needle, including: a needle holder including a first tube, a second tube and a holder tail; a needle in stalled in the first tube; a built-in sliding sleeve which is elongated and through and has a C-shaped cross section; a needle shield which is hollow and elongated; and a spring sheathed on the first tube. The second tube is installed in the built-in sliding sleeve and is capable of sliding back and forth. The built-in sliding sleeve is installed in the needle shield and is capable of sliding back and forth. A locking mechanism is formed by the holder tail and the needle shield. When the holder tail is unlocked from the needle shield, a force of the spring pushes the second tube to slide backward, and then the built-in sliding sleeve is driven to slide rearward to lock with the needle shield.

Abstract: A retractable self-destructing safety syringe with pre-attached needle including a barrel, an inner needle base disposed in a barrel neck at an end of the barrel body, and an elastic engagement mechanism formed between the barrel neck and the inner needle base is provided. An asymmetric elastic locking member having an elastic function is disposed at the end of the plunger, with which a sleeve-type retractable locking member on the needle base can be interlocked by the elastic function. After being retracted into the barrel body, the needle base together with the needle will be forced to deflect to one side under an asymmetric force, and the needle therefore will be forced to incline in a direction nearly a 45 degree angle toward to one side of the inner wall of the barrel and is blocked by the barrel neck, so that the needle and the needle base could not be pushed out the barrel neck again and self-destruction of the syringe is truly achieved.

Abstract: A retractable self-destructing safety syringe with pre-attached needle including a barrel, an inner needle base disposed in a barrel neck at an end of the barrel body, and an elastic engagement mechanism formed between the barrel neck and the inner needle base is provided. An asymmetric elastic locking member having an elastic function is disposed at the end of the plunger, with which a sleeve-type retractable locking member on the needle base can be interlocked by the elastic function. After being retracted into the barrel body, the needle base together with the needle will be forced to deflect to one side under an asymmetric force, and the needle therefore will be forced to incline in a direction nearly a 45 degree angle toward to one side of the inner wall of the barrel and is blocked by the barrel neck, so that the needle and the needle base could not be pushed out the barrel neck again and self-destruction of the syringe is truly achieved.

Abstract: The present invention disclosed a retractable self-destroying safety syringe with replaceable needle including a barrel body, a needle base body (3) disposed in a barrel neck (2) at an end of the barrel body (1), an elastic buffering engaging mechanism formed between the barrel neck (2) and the needle base body (3). An asymmetrical elastic retracting locking member having an elastic function is disposed at an end of a plunger, with which an internal sleeved retracting locking member of the needle base body can be interlocked by the elastic function. After being retracted into the barrel body (1), the needle base body is deflected to one side under an asymmetric force, and the needle therefore inclines in a direction nearly a 45 degree angle to one side of the inner wall of the barrel body (1) and is blocked by the barrel neck of the barrel body, so that the needle and the needle base could not be pushed out of the barrel neck again and self-destruction of the syringe is truly achieved.