JPH0584295A - Medical pasta syringe - Google Patents

Abstract

PURPOSE: To provide a medical paste injector for injecting a medical paste to be used for medical treatment. CONSTITUTION: A medical paste injector is provided with a main body 14, a fixed handle 12 fitted to the main body 14, a movable handle 20 that is turnably fitted to the main body 14, a medical paste holding means that is removably fitted to the main body 14, a medical paste sending-out means that is fitted to the movable handle 20 and to the main body 14 so that it is sent out from the medical paste holding device by the motion of the movable handle 20 with regard to the fixed handle 12, and a control means which is fitted to the main body 14 and by which the feed of the medical paste is restricted to a give quantity.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates generally to devices used in medical procedures for humans, and more particularly to devices for injecting medical pasta.

[0002]

BACKGROUND OF THE INVENTION It has long been known to inject pasta or semi-plastic materials to reinforce muscles such as the urethral sphincter. In this procedure, a catheter is inserted into the urethra and advanced to the position of contact with the sphincter. The desired amount of pasta, such as PTFE, is pumped under high pressure to the treatment area near the tip of the catheter. The outer dimensions of the catheter are determined by the dimensions needed to pass through the urethra.

Medical infusion pumps suitable for this task have previously been available. Gorman et al. U.S. Pat.
No. 51,135 discloses a syringe that mixes two different materials during injection. A pistol grip type syringe is disclosed in Storz U.S. Pat. No. 4,276,878. This particular pump uses a flexible piston rod and a series of spherical pistons along its length. Model 27200 A from the German company Karlstorz
Thumb actuated Teflon syringes are commercially available.

Leonard US Pat. No. 4,820,287
A thumb actuated pump for medical pasta is disclosed. This disclosure emphasizes safety features for pressure control. Both Lennard's device and other prior art devices lack the required solidity and precision pouring capabilities in addition to one-handed operation and the ease of replacement of sterile medical pasta.

[0005]

SUMMARY OF THE INVENTION The present invention overcomes the deficiencies of prior art medical pasta injectors by providing a pistol grip actuated injector for use with one hand. The injector of the present invention uses a precise ratchet with fine graduations to accurately deliver the desired volume. This ratchet provides auditory feedback to indicate the amount delivered. Small amount with each manual stroke (eg 0.2cc)
A special stop bar limits the movement of the pistol grip so that the medical pasta can be delivered accurately.

The injector of the present invention uses a disposable syringe cylinder to hold sterile medical pasta. The syringe is easily inserted into and removed from the injector. A flexible piston is used in the syringe to deliver the medical pasta from the syringe into the catheter. The use of flexible pistons in this way maintains a sterile field with easily disposable elements. With the exception of the disposable syringe cylinder and the flexible piston, the rest of the syringe is made of metal and sterilized in an autoclave.

The tip of the syringe is attached to the proximal end of the catheter using a conventional Luer fitting. The catheter is of suitable length and diameter for use in the urethra. The catheter must be strong enough to withstand the relatively high pressures of delivering the semi-plastic material. Other objects of the present invention, and additional advantages of the present invention will be apparent from the following description of the embodiments with reference to the accompanying drawings. Similar reference numbers are used for similar parts in all drawings.

[0008]

1 is a side view of a medical pasta injector 10 using the present invention. The main body 14 of the injector 10 is a cast metal casting that can be sterilized under high pressure and has a fixed handle 12 formed to fit in the palm of the user. Protrusion 22
Movable handle 20 having an attached surface is shaped to fit the user's finger. The movable handle 20 is
It rotates about the axis 24. As will be described later in detail, the medical pasta is delivered by the work performed by the user pulling the movable handle 20 toward the fixed handle 12.

A pawl 26 is rotatably joined to the movable handle 20 at an axis 28. Therefore, when the user pulls the surface of the movable handle 20 on which the protrusion 22 is provided toward the fixed handle 12, the movable handle 20 moves along the axis 24.
Rotate about and push the pawl 26 in the opposite direction, ie away from the fixed handle 12. The front edge of the pawl 26 engages the ratchet edge 32 of the ratchet rod 30 and pushes the rod 30 to the left in FIG. The ratchet engagement latch 18 is a jig 1
6 is slidably held. As the ratchet rod 30 advances, the latch 18 will move to the continuous one of the ratchet edges 32.
One by one to prevent the ratchet rod 30 from moving to the right. In this way, the ratchet rod 30 advances through the rod bearing 42.

The ratchet rod 30 has a knob 34 at the proximal end. The knob 34 is attached to the stop ring 33 by screws (not shown). Knob 34 serves two distinct functions. That is, first, the knob 34
Prevents ratchet rod 30 from advancing to the left beyond the position where knob 34 engages jig 16. Second, the latch 1
When the button 19 attached to the 8 is pressed down by hand at the same time, it also functions as a convenient tool for pulling the ratchet rod 30 to the right by hand. This operation resets the injector to insert the syringe cylinder, as described in detail below.

A syringe cylinder (not shown) is inserted into a semi-cylindrical body 36 having an open top. The tip of the syringe cylinder is inserted into the cylindrical holder 48. The tip of the syringe cylinder goes through a joint 38, which
Are inclined from the cylindrical holder 48 by an inclined portion 39. The collar portion of the syringe cylinder is inserted into the slot 40, thus securing the syringe cylinder. By moving ratchet rod 30 to the left through rod bearing 42 and cylindrical housing 17, medical pasta is delivered.

FIG. 2 is a front view of the injector 10. Orifice 44 is the lumen of the joint. The other elements are as described above. FIG. 3 is a plan view of the injector. The rod 56 is an extension of the tip of the ratchet rod 30.
As is apparent from the figure, the rod 56 is smooth and does not have the ratchet edge 32. At the tip of the rod 56, the cylindrical body 5
4 and a rod 52 having a piston grip 50 are provided. The cylinder 54 pushes against the flexible piston (not shown) of the syringe cylinder. The piston clip 50 is adapted to engage a flexible piston, as described in detail below. The other elements are as described above.

FIG. 4 is a plan view of one embodiment of the syringe cylinder. The tip 66 is inserted into the joint 38 (FIG. 5).
See also). As described above, the cylinder body 68 is inserted into the semi-cylindrical body 36. The collar portions 62 and 64 are
It is inserted into the slot 40 (see also FIGS. 1 and 3). The flexible piston 72 slides to the left when pushed against the cylinder 54 through the orifice 74 to expel medical pasta from the lumen 70. Piston grip 50 engages in a slot (not shown) in flexible piston 72.

In this embodiment, the syringe cylinder 60 is an ordinary disposable syringe made of molded polymer so that the user can fill it with medical pasta. That is, after removing the flexible piston 72 and the thumb actuator and rod (not shown), the lumen 70 is filled with pasta from a tube of sterile medical pasta. The thumb actuator and stick are discarded and the flexible piston 72 is repositioned through the orifice 74 to block the proximal end of the lumen 70.

FIG. 5 is a plan view of the injector 10 showing the syringe cylinder 60 inserted in place with dashed lines. All elements have been described. FIG. 6 is an enlarged plan view of a partially emptied syringe cylinder within the syringe. All elements have been described. FIG. 7 is an enlarged view of another embodiment of the syringe cylinder 60 positioned in the syringe. The syringe cylinder 60 of this embodiment is pre-filled with medical pasta so that another form of flexible piston is delivered with the proper positioning. Neither the piston grip 50, nor the corresponding slot in the flexible piston 78, is required during operation because the flexible piston 78 need only move in a single direction (ie, from the hand to the tip). All other elements have been described.

FIG. 8 is a side view of the injector 10 with a portion of the main body 14 cut away. Exercise stop pin 8
0 is fixed in the motion stop pin seat 82. The function of this pin 80 is to stop the movement of the movable handle 20 at point 84 as shown. Limiting the movement of the moveable handle 20 at this precise point 84 can limit the amount of pasta delivered to a known small amount.
In a preferred embodiment, this corresponds to 0.2 cc.

It is also possible to give audible feedback to the user by keeping a specific number of ratchets through latch 18 before stop pin 80 contacts point 84. In the preferred embodiment, this is exactly 3. Therefore, the user hears the latch click three times and knows that the movable handle has performed maximum movement and that 0.2 cc of medical pasta has been delivered.

Having described the preferred embodiment of the invention,
A person skilled in the art, without departing from the scope of the invention,
Other embodiments could be devised.

[Brief description of drawings]

1 is a side view of a main body of an injector according to the present invention. FIG.

FIG. 2 is a front view of an injector assembly.

FIG. 3 is a plan view of an injector assembly.

FIG. 4 shows a disposable syringe cylinder.

FIG. 5 is a plan view of the injector assembly after inserting the disposable syringe cylinder.

FIG. 6 is an enlarged view of the disposable syringe cylinder in dashed lines to show the dispensing operation.

FIG. 7 is an enlarged view showing another example of the disposable syringe cylinder.

FIG. 8 is a side view of the injector with a portion cut away to show the stop bar.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Injector 12 Fixed handle 14 Main body 16 Jig 17 Cylindrical housing 18 Latch 19 Button 20 Movable handle 22 Protrusion 26 Claw 30 Ratchet rod 32 Ratchet edge 33 Stop ring 34 Knob 36 Semi-cylindrical body 39 Inclined portion 40 Slot 42 Bar bearing 44 Orifice 48 Cylindrical holder 50 Piston grip 52, 56 Rod 54 Cylindrical body 60 Syringe cylinder 62, 64 Flange portion 66 Tip 68 Cylinder body 70 Lumen 72, 78 Flexible piston 74 Orifice

Claims (2)

[Claims] 1. A main body, a fixed handle attached to the main body, a movable handle rotatably attached to the main body, and a detachable attachment to the main body for holding medical pasta. And a means attached to the movable handle and the main body so that the movement of the movable handle relative to the fixed handle delivers the medical pasta from the holding device, and the means attached to the main body for constant delivery of the medical pasta. A medical pasta injector including means for limiting the amount. 2. The injector of claim 1, further comprising means coupled to the main body for providing a volume of auditory indication.