KR800002005Y1 - Hypodermic injection device having cannula covered with resilient sheath - Google Patents

Abstract

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Description

Subcutaneous injector with bushing covered with elastic cover

1 is a longitudinally cut cross-sectional view showing, in part, a lid mounted on a trocar when the injection device is in the ready position.

FIG. 2 is a view similar to that of FIG. 1, showing the compressed lid with the cartridge fully protruded, just after the start of the operation of the injection device and just before the injection of the plunger and the injection of the drug.

FIG. 3 is a view similar to that of FIG. 2, showing a slightly constricted bushing from the full protrusion of FIG. 2, which occurs at the end of the injection.

The present invention relates to a gun-type injection device, in which a spring device adjusts the ampoule and the trocar for inserting a trocar and injecting drugs.

An elastic cover is provided to keep the sterile at all times prior to injection.

In the device of the present invention, the ampoule and the attached bushing can slide within the cylindrical container, which is closed at the end except for the hole through which the bushing passes when the device is operated to accommodate the bushing.

An elastic device controls the plunger, which is engaged with the ampoule to steer the ampoule and the bushing forward so that the bushing exits through the opening at the closed end of the cylindrical container and enters the location for receiving liquid medication.

After placing the bushing in place, move the plunger continuously, and the piston in the ampoule will move forward to inject the drug.

During this operation, the resilient cover covered with the bushing is received in the closed end of the cylindrical container and is pierced by the end of the bushing as the bushing moves forward. As the bushing continues to move forward, the cover is squeezed between the closed end of the cylindrical container and the bushing hub. This action continues until the bushing is fully pushed out, at which time the cover is not fully compressed so that the cover can act as a shock absorber at any time during the advancing of the bushing. At the end of the injection, the forward movement of the spring becomes

That is, the energy of the spring is less than the energy currently stored in the crimped lid. So at the end of the injection, the bushings wither slightly.

The purpose of the present invention is to make a total injection device which can maintain the sterile sterilization at any time before injection by having the flexible bushing cover, and also allow the flexible bushing cover to act as a shock absorber during the operation of the device. At the end, the elastic cover will be slightly stretched so that the bushings will shrink slightly.

Referring to the present invention by the accompanying drawings as follows.

The device consists of one outer cylindrical sleeve 100, one end of which has a shoulder 110 bent inward and an annular groove 113 on the inner wall around the other open end.

The cartridge assembly 106 is assembled into the end with the shoulder in the outer sleeve 100. The cartridge assembly 106 includes a cartridge receiver sleeve 104 that fits snugly within the sleeve 100 and has a smaller front end 153, the smaller end of which is made by the outer sleeve shoulder 110. A shoulder 154 is formed to fit snugly to the seat 112. The foremost end 156 of the receiver sleeve 104 becomes increasingly pointed to form a small circular hole.

The cartridge 135 includes an ampoule 136 containing a liquid drug 146 therein, with a piston 148 at one end and a bushing 150 at the other end. The ampoule cylinder 136 has a neck portion 80 having a diameter smaller than its diameter, and at the end is an annular flange that is slightly larger in diameter.

The bushing 150 is fixed to the bushing hub 81 and the bushing hub is again fixed to the enlarged flange above the neck 80.

In particular, the bushing hub 81 is composed of a small diameter portion 84, which is attached to the bushing 150, and an intermediate portion 86 connected to the enlarged portion 88. The enlarged portion 88 fits snugly into the annular flange of the neck portion 80 of the ampoule cylinder. Inside the neck of the ampoule 136 between the inner end of the bushing 150 and the drug is a generally hydraulically ruptured diaphragm insert as described in US Pat. No. 3,391,695 to Sarnoff. It is.

The cartridge assembly 106 is assembled in the outer sleeve 100 such that the bushing 150 is spaced apart from the perforated end of the receiver 100.

The full length of the ampoule 135 and the bushing 150 may be fully accommodated in the container sleeve 104 as shown in FIG. The outer sleeve 100 completes the device at a length sufficient to receive the cartridge assembly 106 at one end and the gun assembly 200 at the other end. The gun assembly 200 consists of an inner gun sleeve 101 and the inner gun sleeve 101 has a flange 103 that is bent out so that the flange 103 is inserted when the gun assembly is inserted into the outer sleeve 100. Meshes with the end of the cartridge receiver sleeve 104.

The other end of the inner gun sleeve 101 is bored to form a hole 120. The rear outer surface 122 of the inner gun sleeve 101 is planar and perpendicular to the longitudinal axis of the sleeve for the purpose of being later pushed out.

Plunger 162 fits snugly within the outwardly bent flange end in inner gun sleeve 101. The plunger has a cylindrical body portion 163 and a circular head portion 164 whose diameter is larger than the diameter of the body portion 163 and is generally larger than the diameter of the piston 148 in the ampoule 135. Slightly smaller

There is a hole in the head 164 that is large enough to align with the through hole 166 in the plunger body 163. On the circumference of the plunger head 164 there are many tabs 168 extending radially. Since these tabs 168 form a diameter larger than the diameter of the plunger head 164, the tabs will engage the ends of the ampoule cylinder 136.

The flutes 172 are formed immediately behind the tab 168 at the plunger head 164. These grooves are sized to accept the tabs 168 when the tabs are later broken or bent back during device operation.

These grooves extend over the entire length of the head behind the tabs.

Referring to FIGS. 1 and 2, the locking pawl 176 is fitted into the plunger 162 through the hole 166 and at one end of its central body portion 178 is an outwardly extending protrusion 180. To engage with the annular shoulder 182 of the plunger head 164. The other end of the locking detent 176 is equipped with four spring detent arms, spaced at equal intervals and extending longitudinally, at the end of which is a conical detent head 186. This locking detent 176 holds the plunger 162 and the inner gun sleeve 101 in an assembled position with the coil spring 138 pressed between them as follows.

The coil spring 138 is covered over the plunger body 163 and at one end is in contact with the plunger head 164 and at the other end is in contact with the inner surface of the end wall of the inner sleeve 101. A sufficient compression of the coil spring 138 will cause the detent head 186 to engage inwardly by engaging the periphery of the end wall hole 120, through which the base of the detent head 186 may be directed to the inner gun sleeve 101. Seated on a flat surface 122, the plunger and inner gun sleeve remain assembled with the coil spring 138 compressed therebetween. If desired, a metal washer 127 may be covered on the rear flat surface 122 of the inner sleeve 101, in which case a guide and support flange 128 is provided to surround the hole 120. It is good to be cheap. The flange 128 is provided with a lip to hold the washer in place.

As shown in FIGS. 1 and 2, the inner gun sleeve 101 has a number of protruding ribs 129 extending longitudinally from the flange 103 to about half the entire length of the inner sleeve. Stretched

The outer gun sleeve 192 is fitted over the inner gun sleeve 101 and sized to engage the ribs 129 and cause friction. The closed end 194 of the outer sleeve 192 has a central hole 196 from which the truncated cam surface 198 extends, the size and shape of which is associated with the truncated detent head 186 and the head being It can move radially inward to engage. On the circumference of the outer gun sleeve 192 is fitted a locking rib 199 which fits into the groove 113 in the outer sleeve 102 to keep the dry assembly 200 positioned in the outer sleeve.

The length of the outer gun sleeve 192 is slightly smaller than the length of the inner gun sleeve 101 so that there is a space between the inner wall of the outer gun sleeve 192 and the flange 103 of the inner gun sleeve 101 to provide two It should be noted that the long sleeves of the ss allow the conical detent head 186 to move relative to one another inward.

A safety pin assembly is provided to prevent the truncated detent heads 186 from suddenly engaging inwardly. This safety pin device consists of a cap 142 having a cylindrical sleeve 143 sized to fit over the distal end of the outer gun sleeve 192.

The safety pin 144 extends from the center of the cap 142 into a hole formed by the inner portion of the detent head 186, thereby preventing the detent head from moving inward.

The cap 142 has a number of spacer abutments 145 therein to suitably position the cap relative to the outer sleeve 192.

As shown in FIG. 1, the resilient cover 250 is covered in the bushing 150 with the open end of the cover fitted and fitted around the bushing hub portion 84 and formed by the hub portions 84 and 86. In contact with (82). The length of the cover is such that its blocked end is slightly away from the end of the bushing 150. A large number of ribs 157 were formed on the inner surface of the pointed holder portion 156 surrounding the hole to ensure that the covered bushing was in proper alignment with the hole 158. Thus, the tip of the lid 250 is leaning against the convergence zone of the ribs 157 so that the necessary alignment is maintained.

Operating the injection device causes the cartridge assembly 106 to advance so that the lid 250 is squeezed between the bushing end of the cartridge receiver sleeve 104 and the hub shoulder 82 as shown in FIG. The bushing acts as a shock absorber that gradually absorbs a portion of the energy provided by the spring 138 when advancing the cartridge assembly 106 forward when compressed. In any case, even if the bushing is fully extended, it should be noted that the lid acts as a solid and thus the lid is not compressed to such an extent that it will not absorb shock under such conditions.

When the bushing 150 is fully extended as shown in FIG. 2, the bushing cover 250 is squeezed to the maximum so that the largest repulsion force exists in the pressed cover in such a position. As shown in FIG. 2, the cartridge 135 completes its movement by the force of the spring 138 and starts the injection cycle. The size of the cover is greater than the force remaining on the spring 138 when the spring 138 reaches the point that the force stored in the cover is slightly less than the total travel distance of the piston in the maximum crimped state as in FIG. Big. The crimped lid 250 at this point causes the cartridge 135 and the bushing 150 attached thereto to be slightly crushed, as shown in FIG. Then the final stage of injection takes place. It is at this time that the forces of the crimped lid and spring 138 cancel each other out.

The importance of the cover 250 and its various characteristics becomes even more important when considering that ampoule cylinders (ie the cylinder 136 of the device shown) are made of glass and are fragile.

Claims (1)

There is a cartridge receiver 104 slidably supporting a cartridge 135 containing an ampoule to which a bushing 150 is attached, and the ampoule is formed of a cylindrical sleeve 100 that can slide the piston 148. One end of the sleeve 100 is open and at the other end there is a device 110 for receiving a bushing, the liquid drug is between the piston and the bushing, and the power unit 138, which is operatively associated with the cartridge, is moved by the cartridge. In the injection device having devices for moving the frontal in the bushing direction to inject the liquid in the ampoule, and controlling the operation of the power unit 138, the elastic cover 250 covers the bushing 150, the cover ( 250 is formed of an elastic cylinder in which one end is blocked, the other end is open, the length of the cover 250 is such that the blocked end is slightly spaced apart from the end of the bushing 150, A device 156 is provided to prevent forward movement of the dog 250 such that the bushing 150 can penetrate the lid 250 to inject liquid drug in the sleeve when the power unit 138 moves the cartridge 135 forward. Subcutaneous injection device having a bushing covered with an elastic cover, characterized in that configured to enable.